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The world of smartphones has been busy for the past few months. There have been numerous revolutionary launches with groundbreaking innovations that have the capacity to change the course of the smartphone industry. But the most important attribute of a smartphone is the display, which has been the focus for all prominent players in the mobile phone industry this year.

Samsung came up with its unique 18:5:9 AMOLED display for the Galaxy S8. LG picked up its old trusted IPS LCD unit for the G6’s display. These display units have been familiar to the usual Indian smartphone buyer. Honor, on the other hand, has just unveiled the new Honor 8 Pro for the Indian market that ships with an LTPS LCD display. This has led to wonder how exactly is this technology different from the existing ones and what benefits does it give Honor to craft its flagship smartphone with. Well, let’s find out.

The LCD technology brought in the era of thin displays to screens, making the smartphone possible in the current world. LCD displays are power efficient and work on the principle of blocking light. The liquid crystal in the display unit uses some kind of a backlight, generally a LED backlight or a reflector, to make the picture visible to the viewer. There are two kinds of LCD units – passive matrix LCD that requires more power and the superior active matrix LCD unit, known to people as Thin Film Transistor (TFT) that draws less power.

The early LCD technology couldn’t maintain the colour for wide angle viewing, which led to the development of the In-Plane Switching (IPS) LCD panel. IPS panel arranges and switches the orientation of the liquid crystal molecules of standard LCD display between the glass substrates. This helps it to enhance viewing angles and improve colour reproduction as well. IPS LCD technology is responsible for accelerating the growth of the smartphone market and is the go-to display technology for prominent manufacturers.

The standard LCD display uses amorphous Silicon as the liquid for the display unit as it can be assembled into complex high-current driver circuits. This though restricts the display resolution and adds to overall device temperatures. Therefore, development of the technology led to replacing the amorphous Silicon with Polycrystalline Silicon, which boosted the screen resolution and maintains low temperatures. The larger and more uniform grains of polysilicon allow faster electron movement, resulting in higher resolution and higher refresh rates. It also was found to be cheaper to manufacture due to lower cost of certain key substrates. Therefore, the Low-Temperature PolySilicon (LTPS) LCD screen helps provide larger pixel densities, lower power consumption that standard LCD and controlled temperature ranges.

The AMOLED display technology is in a completely different league. It doesn’t bother with any liquid mechanism or complex grid structures. The panel uses an array of tiny LEDs placed on TFT modules. These LEDs have an organic construction that directly emits light and minimises its loss by eradicating certain filters. Since LEDs are physically different units, they can be asked to switch on and off as per the requirement of the display to form a picture. This is known as the Active Matrix system. Hence, an Active Matrix Organic Light Emitting Diode (AMOLED) display can produce deeper blacks by switching off individual LED pixels, resulting in high contrast pictures.

The honest answer is that it depends on the requirement of the user. If you want accurate colours from your display while wanting it to retain its vibrancy for a longer period of time, then any of the two LCD screens are the ideal choice. LTPS LCD display can provide higher picture resolution but deteriorates faster than standard IPS LCD display over time.

An AMOLED display will provide high contrast pictures any time but it too has the tendency to deteriorate faster than LCD panels. Therefore, if you are after greater picture quality, choose LTPS LCD or else settle for AMOLED for a vivid contrast picture experience.

5.2. COMPANIES THAT HAVE ADVERTISEMENTS DISPLAYED ON THE WEBSITE WILL STORE AND USE COOKIES IN ACCORDANCE WITH THEIR OWN PRIVACY POLICIES. ADVERTISERS AND THIRD PARTY COMPANIES WILL NOT BE PERMITTED TO ACCESS OR USE COOKIES OWNED BY THE WEBSITE.

According to LCD (Liquid Crystal Display) technology and LCD materials, mobile phone LCD assemblies can be classified into 2 types: TFT (Thin Flim Transistor) and OLED（Organic Light-Emitting Diode). TFT display needs with backlight, but OLED is light-emitting, each pixel is creating its own light.

For Original iPhone LCD, 5-8 plus and Xr, 11 is TFT, X-13 Pro Max is OLED (except XR and 11). But in mobile phone aftermarket, there are too many different types and different qualities, which makes customers confused.

What is in-cell? What is OGS or " with TP"? What is COF? What is COG? What is OEM? What is FOG? What is Original Change Glass? What is IPS? What is LTPS? What is a-Si?

HTPS with small size, high precision, and high contrast. Most used in magnified display products. Such as projectors, projection TVs, etc. And cannot be used as a mobile phone display, so we don"t talk about it here.

Because the electrons deflect the liquid crystal molecules through the transistor. Electron mobility fundamentally determines the refresh rates of the TFT device. The smaller mobility, the slower transmission of holes and electrons, and the slower response rate. Can"t physically support high refresh rates.

In order to improve the response performance, can increase transistor size to enhance the migration, but this will lead to the extra TFT device that will occupy the display area pixel area. Therefore, the larger unit transistor area, the single-pixel occupy area is smaller(Pixel Aperture Ratio ), resulting in lower brightness.

As we can see electron mobility of a-Si is very low (0.5-1cm2/Vs). But LTPS can deliver a hundred times the mobility than a-Si, and a much higher aperture ratio and PPI is much higher than a-Si resolution.

Compared with LTPS，a-si TFT have those "weakness":a-Si with so much low resolution and low definition. a-Si is 720*1280 with a very blurred display effect.

a-Si with so much bad display performance, but why are there still so many manufacturers producing phone LCDs with a-Si, or why do the customers willing to use a-Si LCD for their phone?

LCDs business has too much competition and wholesalers want to make more profit, they keep pushing suppliers to make LCDs at lower prices. So some of the suppliers start to produce aftermarket phone displays with a-Si to match customers" lower price requirements.

Now in the market a-Si LCDs for iPhone is TFT with TP but not in-cell. Our ZY a-Si will be in-cell not just TFT with TP. ZY a-Si incell for Xr and 11 ready now, please to get more details.

For more details or questions about in-cell and TFT with TP or about phone LCD display. Please click here to get more information, or Long press and scran the QR code to add me.

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October 1, 2013 (Tokyo, Japan): Japan Display Inc. (JDI), a global leader in mobile display technologies, started shipment of 8.9-inch Wide-QXGA (2,560 x 1,600 pixels) low temperature poly-silicon (LTPS) TFT-LCD modules in September 2013. A 7.0-inch Wide-UXGA (1,200 x 1,920 pixels) LTPS TFT-LCD module has been in mass production since June, 2013. These high-resolution displays are capable of showing rich content with the highest pixel density among tablet displays.

The tablet market is expanding rapidly nowadays. A high-capacity, high-resolution, low power consumption display is desired to create a device which can show large amounts of information on one page and with long battery life.

To date, most conventional tablet devices have employed amorphous silicon (a-Si) TFT-LCD technology, resulting in displays with low pixel density, wide dead-band areas, and high power consumption. JDI"s LTPS TFT-LCD technology has contributed to 40-50% less power consumption and about 30% narrower dead-band width compared to conventional designs for a-Si TFT-LCDs*.

The 7.0-inch Wide-UXGA TFT-LCD has pixel density of 323ppi, and the 8.9-inch Wide-QXGA TFT-LCD is 339ppi. JDI"s in-plane switching (IPS) technology realizes wider viewing angles, a higher contrast ratio and less color shift. The combination of IPS, high-resolution and high brightness of 500cd/m2 contribute to clear and vivid images for small fonts and high quality pictures.

Since there are fewer LCD drivers, JDI"s LTPS TFT-LCD technology contributes to 70-80% less power consumption of the LCD driving system than conventional designs for a-Si TFT-LCDs*. JDI"s unique high-transmissive pixel design minimizes backlight power consumption by approximately 40% less compared to conventional designs for a-Si TFT-LCDs*.

JDI"s LTPS TFD-LCD technology is able to achieve about 30% narrower dead-band width than conventional designs for a-Si TFT-LCDs*. A large display within a thin device can be realized for easy portability.

Although LTPO tech on a smartphone first came into notice with Samsung Galaxy Note 20 Ultra, lately, we have seen this being adopted by several brands. It brings in several big and small refinements over the traditional technology used for the display.

LTPO, which stands for low-temperature polycrystalline oxide, is shaping up to be the next-generation technology for premium phones and wearables. It basically combines LTPS and IGZO for the display backplane. Let us explain.

Every AMOLED display has a backplane that determines when individual pixels turn on and how bright they glow. Most backplanes use two separate transistors (TFTs) – one for switching on a pixel (Switching TFTs) and one for maintaining its brightness (driving TFTs). The Driving TFT is also accompanied by a Capacitor that samples and holds a voltage to uniformly drive a pixel brightness.

LTPO displays use faster LTPS for switching circuits and more power-efficient IGZO material for driving circuits (more on that in a bit). Faster LTPS switching circuits make dynamically changing refresh rates possible (VRR on phones) and power-efficient IGZO driving TFTs help to reduce power consumption by 5 to 20 percent.

Thus LTPO displays combine the benefits of both IGZO and LTPS backplanes. These displays can quickly switch between different refresh rates in a power-efficient manner and thus make VRR possible. LTPO panels can reduce power consumption by 5 to 20 percent.

As described above, each AMOLED pixel comprises of two Thin Film Transistors (TFT)- Driving TFT and Switching TFT- and one Capacitor. In an LTPO display, the switching circuits use LTPS TFT and driving circuits use IGZO TFT.

Amorphous Silicon (a-Si) TFT technology used to be dominant for display backplanes. With a need for high resolution and brighter screens, the industry shifted to LTPS TFT backplanes (for both OLED and LCD), and then the need for higher resolution and high-refresh-rate brought in more complicated IGZO TFT (Oxide TFT) panels.

LTPS (Low-temperature polycrystalline silicon) backplanes have higher electron mobility and thus can turn pixels on/off faster. Or transistor size can be reduced and more transistors can now be added within the same space, thus resulting in more pixels or higher resolution. However, along with faster mobility, LTPS panels also have higher leakage.

IGZO (indium gallium zinc oxide) backplane technology or transistors used in backplanes that are often used for IPS LCD displays. IGZO transistors are transparent and thus IGZO backplane displays require less backlight power and consume less power. Electron Mobility of IGZO is as high as LTPS and these displays are more touch-sensitive (we are guessing the use of IGZO in Samsung Galaxy Note20 Ultra’s display plays a major role in reducing S Pen latency to 9ms).

So, the LTPO display combines the benefits of both LTPS and IGZO resulting in a more responsive screen that consumers lesser power than conventional LTPS screens. As stated above, in LTPO panels, the switching circuits use LTPS TFTs and the driving TFTs use IGZO materials.

As we discussed a while back, phones don’t have a true variable refresh rate. The biggest power draw in current high refresh rate phones are the display panel and display driver ICs.

Most modern phones keep refreshing at set frequencies or switching between different frequency presets even while displaying static content. DDICs working this way have to work harder and naturally waste more power.

Android phones like ROG Phone 3, OnePlus 8 Pro, and Galaxy S20 do have variable or adaptive refresh rate modes implemented on a software level. In such modes, the displays can change refresh rate but only to certain predefined settings – 720@60Hz, 1080@60hz, 1080@90Hz, etc.

The Galaxy Note 20 Ultra, on the other hand, brought in a true variable refresh rate. The display refresh could be as low as 10Hz while reading articles or vary from 30 to 120Hz while playing games.

Total shipments of mobile phone displays, including thin-film transistor liquid crystal display (TFT LCD) and active matrix organic light-emitting diode (AMOLED) panels, reached 2.01 billion units in 2017, up 3 percent from 2016, according to preliminary estimate from business information provider IHS Markit (Nasdaq: INFO).

In the growing mobile phone display market, shipments of low-temperature-poly-silicon (LTPS) TFT LCD panels, which realize high-resolution images, increased by 21 percent to 620 million units in 2017 compared to the previous year. Shipments of amorphous silicon (a-Si) TFT LCD mobile phone panels declined 4 percent to 979 million units during the same period. Even though shipments of AMOLED panels jumped in the second half of 2017 thanks to the launch of the iPhone X, combined with the weak demand in the first half, its shipments were up just 3 percent to 402 million units in 2017.

In the smartphone-use LTPS TFT LCD market, Tianma, a leading small and medium panel supplier in China, has shown significant growth, expanding its shipments to Chinese smartphone set brands, such as Huawei and Xiaomi. In 2017, Tianma shipped 105 million LTPS TFT LCD panels for smartphones, almost double its shipments in 2016, with a market share of 17 percent, up 6 percentage points from 2016. It ranked the second largest LTPS TFT LCD supplier for smartphones in 2017, taking over LG Display with 16 percent, down 4 percentage points, and Sharp with 13 percent, down 1 percentage point. In 2017, Japan Display continued its market leader position but shed its share by 10 percentage points to 26 percent in 2017, according to the latest Smartphone Display Intelligent Service report by IHS Markit.

“LTPS TFT is a key technology to produce high-resolution displays for smartphones, and experience is required to optimize highly complex LTPS manufacturing process in each production fab. In terms of experience, Japanese and South Korean panel makers have a competitive advantage compared to Chinese makers,” said Hiroshi Hayase, senior director at IHS Markit. “However, Chinese LCD makers, such as Tianma and BOE, are catching up LTPS technology fast enough to support high demand from Chinese smartphone set makers.”

The Smartphone Display Intelligent Service by IHS Markit contains quarterly updates of smartphone display shipments and revenue by application, size, resolution and technology. It also provides supply chain information between display and set makers, as well as monthly smartphone display shipment and pricing information.

Over time, the purpose of using mobile phones or Smartphones has changed. Comparatively, it has now become a basic necessity of every individual. Smartphone has dramatically transformed the lives of individuals. It has now become a mini-computer that everyone carries in their pocket. Instead, you can have multiple things at your fingertips in a few seconds. While there are plenty of things to look for, AMOLED vs OLED is also a part of it.

Before purchasing any Smartphone, everyone goes through a list of specifications. This list includes display type, screen size, battery backup, supported operating system, total internal memory, and many others. Today, we have brought a comprehensive study of the significant display technologies available nowadays.

This article will introduce you to AMOLED vs OLED display technologies. Then, we will discuss the properties of both display technologies, followed by the difference between AMOLED vs OLED.

It stands for Natural Light-Emitting Diode, a type of LED technique that utilises LEDs wherein the light is of organic molecules that cause the LEDs to shine brighter. These organic LEDs are in use to make what are thought to be the best display panels in the world.

When you make an OLED display, you put organic films among two conductors to make them. As a result, a bright light comes out when electricity is used—a simple design with many advantages over other ways to show things.

OLEDs can be used to make emissive displays, which implies that each pixel can be controlled and emits its very own light. As a result, OLED displays have excellent picture quality. They have bright colours, fast motion, and most importantly, very high contrast. Most of all, “real” blacks are the most important.  The simple design of OLEDs also makes it easy to create flexible displays that can bend and move.

PMOLED stands for Passive Matrix Organic Light Emitting Diode. The PMOLEDs are easy to find and much cheaper than other LEDs, but they cannot work for a long duration as their lifespan is very short. Therefore, this type of display is generally for small devices up to 3 inches.

AMOLED stands for Active Matrix Organic Light Emitting Diode. This type of display is generally for large platforms. It contains TFT, which further consists of a storage capacitor. It also works on the same principle as OLED displays.

AMOLED offers no restriction on the size of the display. The power consumption of AMOLED is much less than other display technologies. The AMOLED provides incredible performance. It is thinner, lighter, and more flexible than any other display technology like LED, or LCD technology.

The AMOLED display is widely used in mobiles, laptops, and televisions as it offers excellent performance. Therefore, SAMSUNG has introduced AMOLED displays in almost every product. For example, Full HD Super AMOLED in Samsung Galaxy S4 and Samsung Galaxy Note 3, Super AMOLED in Samsung Galaxy S3, HD Super AMOLED in Samsung Galaxy Note, and HD Super AMOLED Plus in Samsung Galaxy S3. Apart from this, it is also used in AMOLED vs OLED creating the following:

So far, we have discussed OLED and AMOLED display technologies. Now, we will look at some of the differences between OLED and AMOLED display technology:

OLED comprises thin layers of the organic component, which emits light when the current passes through it. In this technology, each pixel transmits its own light. On the other side, AMOLED consists of an additional layer of thin-film transistors (TFTs). In AMOLED, the storage capacitors are used to maintain the pixel states.

While the technology is different among various manufacturers, Samsung’s edge AMOLED displays use plastic substrates with poly-Si TFT technology similar to how LG uses it in their POLED technology. This technology is what makes the possibility to build curved displays using an active-matrix OLED panel.

OLED display much deeper blacks as compared to AMOLED displays. You cannot see the screen in AMOLED display under direct sunlight. The AMOLED display quality is much better than the OLEDs as it contains an additional layer of TFTs and follows backplane technologies.

These organic compounds are present between the protective layers of glass or plastic. Comparatively, AMOLED comprises an active matrix of OLED pixels along with an additional layer of TFTs. This extra layer is responsible for controlling the current flow in each pixel.

The OLED display offers a high level of control over pixels. Hence, it can be turned off completely, resulting in an excellent contrast ratio compared to the AMOLED displays and less power consumption. On the other side, AMOLED has faster refresh rates than OLEDs. Also, they offer a tremendous artificial contrast ratio as each pixel transmits light but consumes more power than OLEDs.

OLED displays are comparatively much thinner compared to LCDs. Hence, it provides more efficient and bright presentations. In addition, OLED offers support for large display sizes compared to traditional LCDs. AMOLEDs remove the limitation of display sizes. one can fit it into any display size.

Putting all the points mentioned above in view, the key difference to understand appropriately is that POLED is an OLED display with a plastic substrate. On the other hand, AMOLED is Samsung’s word for its display technology which is mainly for marketing. Therefore, most phone manufacturers having AMOLED displays mean that they are using Samsung displays. It is as simple as that. To add to that, all the curved display technology is made possible because of the usage of the plastic substrate.

So, based on the points mentioned above, the difference between OLED and AMOLED displays, you can choose any of the two display technology at your convenience. Both are good, offer excellent performance, and are customised according to your requirements.

The AMOLED display has a higher quality than OLEDs since it has an additional layer of TTs and uses backplane technologies. When compared to OLED screens, AMOLED displays are far more flexible. As a result, they are substantially more expensive than an OLED display.

Window to the digital world, the display is one of the first seen features when selecting a smartphone, so a show must be good, and an AMOLED display offers the same. Offering a great viewing experience, here are the top 3 AMOLED screen smartphones available in the market right now:

Realme 10 Pro Plus 5G features a 6.7-inch AMOLED display with 394 PPI display. It runs on MediaTek Dimensity 1080. On the rear, the Realme 10 Pro Plus 5G has a triple-camera setup with 108-megapixel primary sensor, 8-megapixel ultra-wide angle sensor, 2-megapixel sensor.

Coming to the front, it has a 16-megapixel selfie camera housed in the punch-hole display. It comes with a 5000mAh battery that supports 67W smart flash charging. The Realme 10 Pro Plus 5G is one of the best segments with a AMOLED FHD display.

The Xiaomi Redmi Note 12 Pro 5G runs on MediaTek Dimensity 1080 chipset bundled with Mali-G68 MC4 graphics processor and up to 12GB RAM. The display front comes with a 6.67-inch AMOLED display with FHD and 395 PPI.

The cameras have a triple rear camera setup with a 50-megapixel primary sensor, an 8-megapixel ultra-wide angle sensor, and a 2-megapixel macro sensor. In addition, it has a 16-megapixel selfie camera. It has a 5,000 mAh battery with 67W fast charging. The AMOLED display on the Redmi Note 12 Pro 5G is a treat for all media enthusiasts.

OPPO has recently launched the OPPO Reno8 5G with MediaTek Dimensity 1300 chipset coupled with Arm Mali-G77 MC9 GPU and up to 8GB of RAM. In addition, it comes with a 6.43-inch curved AMOLED display with support for HDR10+.

On the rear, it comes with a triple-camera setup with a 50-megapixel primary sensor, an 8MP ultra-wide angle sensor, a 2-megapixel macro camera. In addition, it has a 32-megapixel selfie camera integrated inside the punch-hole on display on the front. It comes with a 4,500mAh battery that supports 80W fast charging and can charge the phone 100 per cent in just 15 minutes. Since it comes with an Full HD+ AMOLED display on the display front, it is a treat for gamers and media consumption lovers.

Smartphone displays have advanced significantly in recent years, more so than most people realise in this technological age. Display screens are similar to windows in the mobile world, which has seen a tremendous transformation in innovative products in the last several years. People have gotten more selective when buying a phone in recent years, and although all of the functions are important, the display is always the most noticeable.

LCD (Liquid Crystal Display) is a type of flat panel display which uses liquid crystals in its primary form of operation. LEDs have a large and varying set of use cases for consumers and businesses, as they can be commonly found in smartphones, televisions, computer monitors and instrument panels.

LCDs were a big leap in terms of the technology they replaced, which include light-emitting diode (LED) and gas-plasma displays. LCDs allowed displays to be much thinner than cathode ray tube (CRT) technology. LCDs consume much less power than LED and gas-display displays because they work on the principle of blocking light rather than emitting it. Where an LED emits light, the liquid crystals in an LCD produces an image using a backlight.

A display is made up of millions of pixels. The quality of a display commonly refers to the number of pixels; for example, a 4K display is made up of 3840 x2160 or 4096×2160 pixels. A pixel is made up of three subpixels; a red, blue and green—commonly called RGB. When the subpixels in a pixel change color combinations, a different color can be produced. With all the pixels on a display working together, the display can make millions of different colors. When the pixels are rapidly switched on and off, a picture is created.

The way a pixel is controlled is different in each type of display; CRT, LED, LCD and newer types of displays all control pixels differently. In short, LCDs are lit by a backlight, and pixels are switched on and off electronically while using liquid crystals to rotate polarized light. A polarizing glass filter is placed in front and behind all the pixels, the front filter is placed at 90 degrees. In between both filters are the liquid crystals, which can be electronically switched on and off.

LCDs are made with either a passive matrix or an active matrix display grid. The active matrix LCD is also known as a thin film transistor (TFT) display. The passive matrix LCD has a grid of conductors with pixels located at each intersection in the grid. A current is sent across two conductors on the grid to control the light for any pixel. An active matrix has a transistor located at each pixel intersection, requiring less current to control the luminance of a pixel. For this reason, the current in an active matrix display can be switched on and off more frequently, improving the screen refresh time.

Twisted Nematic (TN)- which are inexpensive while having high response times. However, TN displays have low contrast ratios, viewing angles and color contrasts.

LCDs are now being outpaced by other display technologies, but are not completely left in the past. Steadily, LCDs have been being replaced by OLEDs, or organic light-emitting diodes.

OLEDs use a single glass or plastic panels, compared to LCDs which use two. Because an OLED does not need a backlight like an LCD, OLED devices such as televisions are typically much thinner, and have much deeper blacks, as each pixel in an OLED display is individually lit. If the display is mostly black in an LCD screen, but only a small portion needs to be lit, the whole back panel is still lit, leading to light leakage on the front of the display. An OLED screen avoids this, along with having better contrast and viewing angles and less power consumption. With a plastic panel, an OLED display can be bent and folded over itself and still operate. This can be seen in smartphones, such as the controversial Galaxy Fold; or in the iPhone X, which will bend the bottom of the display over itself so the display’s ribbon cable can reach in towards the phone, eliminating the need for a bottom bezel.

QLED stands for quantum light-emitting diode and quantum dot LED. QLED displays were developed by Samsung and can be found in newer televisions. QLEDs work most similarly to LCDs, and can still be considered as a type of LCD. QLEDs add a layer of quantum dot film to an LCD, which increases the color and brightness dramatically compared to other LCDs. The quantum dot film is made up of small crystal semi-conductor particles. The crystal semi-conductor particles can be controlled for their color output.

When deciding between a QLED and an OLED display, QLEDs have much more brightness and aren’t affected by burn-in. However, OLED displays still have a better contrast ratio and deeper blacks than QLEDs.

An LCD or liquid crystal display is a type of flat panel display commonly used in digital devices, for example, digital clocks, appliance displays, and portable computers.

A simple monochrome LCD display has two sheets of polarizing material with a liquid crystal solution sandwiched between them. Electricity is applied to the solution and causes the crystals to align in patterns. Each crystal, therefore, is either opaque or transparent, forming the numbers or text that we can read.

According to the IEEE, “Between 1964 and 1968, at the RCA David Sarnoff Research Center in Princeton, New Jersey, a team of engineers and scientists led by George Heilmeier with Louis Zanoni and Lucian Barton, devised a method for electronic control of light reflected from liquid crystals and demonstrated the first liquid crystal display. Their work launched a global industry that now produces millions of LCDs.”

Heilmeier’s liquid crystal displays used what he called DSM or dynamic scattering method, wherein an electrical charge is applied which rearranges the molecules so that they scatter light.

Inventor James Fergason holds some of the fundamental patents in liquid crystal displays filed in the early 1970s, including key US patent number 3,731,986 for “Display Devices Utilizing Liquid Crystal Light Modulation”

A liquid crystal display (LCD) has liquid crystal material sandwiched between two sheets of glass. Without any voltage applied between transparent electrodes, liquid crystal molecules are aligned in parallel with the glass surface. When voltage is applied, they change their direction and they turn vertical to the glass surface. They vary in optical characteristics, depending on their orientation. Therefore, the quantity of light transmission can be controlled by combining the motion of liquid crystal molecules and the direction of polarization of two polarizing plates attached to the both outer sides of the glass sheets. LCDs utilize these characteristics to display images.

An LCD consists of many pixels. A pixel consists of three sub-pixels (Red/Green/Blue, RGB). In the case of Full-HD resolution, which is widely used for smartphones, there are more than six million (1,080 x 1,920 x 3 = 6,220,800) sub-pixels. To activate these millions of sub-pixels a TFT is required in each sub-pixel. TFT is an abbreviation for “Thin Film Transistor”. A TFT is a kind of semiconductor device. It serves as a control valve to provide an appropriate voltage onto liquid crystals for individual sub-pixels. A TFT LCD has a liquid crystal layer between a glass substrate formed with TFTs and transparent pixel electrodes and another glass substrate with a color filter (RGB) and transparent counter electrodes. In addition, polarizers are placed on the outer side of each glass substrate and a backlight source on the back side. A change in voltage applied to liquid crystals changes the transmittance of the panel including the two polarizing plates, and thus changes the quantity of light that passes from the backlight to the front surface of the display. This principle allows the TFT LCD to produce full-color images.

Low-temperature polycrystalline silicon (or LTPS) LCD—also called LTPS TFT LCD—is a new-generation technology product derived from polycrystalline silicon materials. Polycrystalline silicon is synthesised at relatively low temperatures (~650°C and lower) as compared to traditional methods (above 900°C).

Standard LCDs found in many consumer electronics, including cellphones, use amorphous silicon as the liquid for the display unit. Recent technology has replaced this with polycrystalline silicon, which has boosted the screen resolution and response time of devices.

Row/column driver electronics are integrated onto the glass substrate. The number of components in an LTPS LCD module can be reduced by 40 per cent, while the connection part can be reduced by 95 per cent. The LTPS display screen is better in terms of energy consumption and durability, too.

LTPS LCDs are increasingly becoming popular these days. These have a high potential for large-scale production of electronic devices such as flat-panel LCD displays or image sensors.

LCD or AMOLED, 1080p vs 2K? There are plenty of contentious topics when it comes to smartphone displays, which all have an impact on the day to day usage of our smartphones. However, one important topic which is often overlooked during analysis and discussion is the type of backplane technology used in the display.

Display makers often throw around terms like A-Si, IGZO, or LTPS. But what do these acronyms actually mean and what’s the impact of backplane technology on user experience? What about future developments?

For clarification, backplane technology describes the materials and assembly designs used for the thin film transistors which drive the main display. In other words, it is the backplane that contains an array of transistors which are responsible for turning the individual pixels on and off, acting therefore as a determining factor when it comes to display resolution, refresh rate, and power consumption.

Examples of backplane technology include amorphous silicon (aSi), low-temperature polycrystalline silicon (LTPS) and indium gallium zinc oxide (IGZO), whilst LCD and OLED are examples of light emitting material types. Some of the different backplane technologies can be used with different display types, so IGZO can be used with either LCD or OLED displays, albeit that some backplanes are more suitable than others.

Amorphous silicon has been the go-to material for backplane technology for many years, and comes in a variety of different manufacturing methods, to improve its energy efficiency, refresh speeds, and the display’s viewing angle. Today, a-Si displays make up somewhere between 20 and 25 percent of the smartphone display market.

For mobile phone displays with a pixel density lower than 300 pixels per inch, this technology remains the preferable backplane of choice, mainly due to its low costs and relatively simple manufacturing process. However, when it comes to higher resolution displays and new technologies such as AMOLED, a-Si is beginning to struggle.

AMOLED puts more electrical stress on the transistors compared with LCD, and therefore favours technologies that can offer more current to each pixel. Also, AMOLED pixel transistors take up more space compared with LCDs, blocking more light emissions for AMOLED displays, making a-Si rather unsuitable. As a result, new technologies and manufacturing processes have been developed to meet the increasing demands made of display panels over recent years.

LTPS currently sits as the high-bar of backplane manufacturing, and can be spotted behind most of the high end LCD and AMOLED displays found in today’s smartphones. It is based on a similar technology to a-Si, but a higher process temperature is used to manufacture LTPS, resulting in a material with improved electrical properties.

LTPS is in fact the only technology that really works for AMOLED right now, due to the higher amount of current required by this type of display technology. LTPS also has higher electron mobility, which, as the name suggests, is an indication of how quickly/easily an electron can move through the transistor, with up to 100 times greater mobility than a-Si.

For starters, this allows for much faster switching display panels. The other big benefit of this high mobility is that the transistor size can be shrunk down, whilst still providing the necessary power for most displays. This reduced size can either be put towards energy efficiencies and reduced power consumption, or can be used to squeeze more transistors in side by side, allow for much greater resolution displays. Both of these aspects are becoming increasingly important as smartphones begin to move beyond 1080p, meaning that LTPS is likely to remain a key technology for the foreseeable future.

The drawback of LTPS TFT comes from its increasingly complicated manufacturing process and material costs, which makes the technology more expensive to produce, especially as resolutions continue to increase. As an example, a 1080p LCD based on this technology panel costs roughly 14 percent more than a-Si TFT LCD. However, LTPS’s enhanced qualities still mean that it remains the preferred technology for higher resolution displays.

Currently, a-Si and LTPS LCD displays make up the largest combined percentage of the smartphone display market. However, IGZO is anticipated as the next technology of choice for mobile displays. Sharp originally began production of its IGZO-TFT LCD panels back in 2012, and has been employing its design in smartphones, tablets and TVs since then. The company has also recent shown off examples of non-rectangular shaped displays based on IGZO. Sharp isn’t the only player in this field — LG and Samsung are both interested in the technology as well.

The area where IGZO, and other technologies, have often struggled is when it comes to implementations with OLED. ASi has proven rather unsuitable to drive OLED displays, with LTPS providing good performance, but at increasing expense as display size and pixel densities increase. The OLED industry is on the hunt for a technology which combines the low cost and scalability of a-Si with the high performance and stability of LTPS, which is where IGZO comes in.

Why should the industry make the switch over to IGZO? Well, the technology has quite a lot of potential, especially for mobile devices. IGZO’s build materials allow for a decent level of electron mobility, offering 20 to 50 times the electron mobility of amorphous silicon (a-Si), although this isn’t quite as high as LTPS, which leaves you with quite a few design possibilities. IGZO displays can therefore by shrunk down to smaller transistor sizes, resulting in lower power consumption, which provides the added benefit of making the IGZO layer less visible than other types. That means you can run the display at a lower brightness to achieve the same output, reducing power consumption in the process.

One of IGZO’s other benefits is that it is highly scalable, allowing for much higher resolution displays with greatly increased pixel densities. Sharp has already announced plans for panels with 600 pixels per inch. This can be accomplished more easily than with a-Si TFT types due to the smaller transistor size.

Smaller IGZO transistors are also touting superior noise isolation compared to a-Si, which should result in a smoother and more sensitive user experience when used with touchscreens. When it comes to IGZO OLED, the technology is well on the way, as Sharp has just unveiled its new 13.3-inch 8K OLED display at SID-2014.

Essentially, IGZO strives to reach the performance benefits of LTPS, whilst keeping fabrications costs as low as possible. LG and Sharp are both working on improving their manufacturing yields this year, with LG aiming for 70% with its new Gen 8 M2 fab. Combined with energy efficient display technologies like OLED, IGZO should be able to offer an excellent balance of cost, energy efficiency, and display quality for mobile devices.

Innovations in display backplanes aren’t stopping with IGZO, as companies are already investing in the next wave, aiming to further improve energy efficiency and display performance. Two examples worth keeping an eye are on are Amorphyx’ amorphous metal nonlinear resistor (AMNR) and CBRITE.

This developing technology can be manufacturing on a process that leverages a-Si TFT production equipment, which should keep costs down when it comes to switching production, whilst also offering a 40 percent lower cost of production compared with a-Si. AMNR is also touting better optical performance than a-Si and a complete lack of sensitivity to light, unlike IGZO. AMNR could end up offering a new cost effective option for mobile displays, while making improvements in power consumption too.

CBRITE, on the other hand, is working on its own metal oxide TFT, which has a material and process that delivers greater carrier mobility than IGZO. Electron mobility can happily reach 30cm²/V·sec, around the speed of IGZO, and has been demonstrated reaching 80cm²/V·sec, which is almost as high as LTPS. CBRITE also appears to lend itself nicely to the higher resolution and lower power consumption requirements of future mobile display technologies.

Smartphones are already benefiting from improvements in screen technology, and some would argue that things are already as good as they need to be, but the display industry still has plenty to show us over the next few years.

Cathode ray tube television sets have long had their day. Flat screen TVs now provide energy-efficient, low-emission entertainment in three out of four German households, according to the Federal Statistical Office. And this figure is rising, Germans are estimated to have purchased eight million flat screen television sets in 2015, most of which are LCDs. LCD technology is also the basis for many other contemporary communication devices, including smartphones, laptops and tablets. After all, with experts forecasting six percent global annual sales growth for flat-panel displays until 2020.

LCD stands for liquid crystal display. Liquid crystals form the basis for billions of flat-panel displays. The American, George H. Heilmeier, unveiled the first monochrome LCD monitor to the expert community in 1968. Commercialization of the first color monitors took another 20 years. Flat screen TVs started sweeping the world in the 1990s, mainly because of the availability of high-performance color filter materials.

The images on a liquid crystal display with the standard resolution are made up of about two million picture elements, better known as pixels. The color filter pigments attached to the liquid crystal cells are what give each pixel its color. Screen contrast and color purity remain a challenge, however.

Color images on liquid crystal displays (LCDs) used in LCD televisions, computers and smartphones are produced using the three primary colors of light—red (R), green (G) and blue (B). These colors are created using pigments. LCDs produce images by transmitting light emitted from a backlight lamp through a color filter to which an RGB pattern has been applied. As a consequence, the pigments used in the color filter are crucial to picture quality.

With Japan’s shift to digital terrestrial television driving up demand for flatpanel LCD televisions and the popularity of smartphones increasing, in 2007 DIC launched the G58 series of green pigments, which achieved a remarkable increase in brightness. The series includes FASTOGEN GREEN A350, a green pigment characterized by outstanding brightness and contrast that ensures excellent picture quality even with little light from the backlight. In fiscal year 2014, DIC developed the G59 series of green pigments for wide color gamut color filters, which deliver superior brightness and color reproduction, making them suitable for use in filters for next-generation high-definition displays, including those for ultra-high-definition (UHD) televisions. DIC currently enjoys an 85%- plus share of the global market for green pigments for color filters, making its products the de facto standard. DIC also manufactures blue pigments for color filters. In 2012, the Company developed the A series, which boasts a superb balance between brightness and contrast. The optical properties of pigments in this series have earned high marks from smartphone manufacturers and boosted DIC’s share of the global market for blue pigments to approximately 50%.

DIC’s pigments for color filters, which satisfy the diverse performance requirements of displays used in LCD televisions, smartphones, tablets and notebook computers while at the same time adding value, have been adopted for use by many color filter manufacturers. In addition to improving picture quality, these pigments reduce energy consumption and, by extension, lower emissions of CO2. Having positioned pigments for color filters as a business that it expects to drive growth, DIC continues working to reinforce its development and product supply capabilities.

Large-screen LCD televisions are expected to deliver superbly realistic and accurate color reproduction. The small LCDs used in smartphones and other devices must be clear, easy to read and bright enough to ensure legibility even with less light. This is because reduced light requirements results in longer battery life. Increasing brightness requires making color filters thinner and more transparent, but this alone will not deliver vivid colors and resolution. With the question of how best to realize both high brightness and vivid colors on ongoing challenge for display manufacturers, DIC has responded by developing innovative pigments for this application.

Color filter (CF, COLOR FILTER) is one of the most important components of a color liquid crystal display, which directly determines the quality of the color image of the display. The rapid growth of LCD displays is supported by the strong demand for flat-panel color displays from notebooks (PCs, Personal Computers). The portable characteristics of the LCD, such as small outline size, thinness, lightness, high definition, and low power consumption, greatly meet the needs of notebook PCs. It is believed that in the multimedia age, TFT-LCD will have a huge advantage. Color filters are the key elements that make up a color image.

The color filter in the liquid crystal display adopts the principle of additive method, and uses blue, green and red organic pigments. Based on the spectral color and durability requirements of colorants, pigments for blue and green color photoresist inks are usually selected: phthalocyanine CI pigment blue 15: 1, pigment blue 15 :0, pigment blue 15: 3, Pigment Blue 15: 4, Pigment Blue 15: 6, and anthraquinone-based pigments such as CI Pigment Blue 60 and the like. Green tone C.I. Pigment Green 36.

In particular, the spectral absorption characteristics of CI Pigment Blue 15: 6 and CI Pigment Green 36 are well matched with the wavelengths and emission intensities of the blue, green, and red fluorescence emission spectra (fluorescence lamp for LCD backlight) in liquid crystal displays. In order to further improve the spectral characteristics, it is possible to adjust by adding a small amount of pigments of other colors, such as adding CI Pigment Violet 23 to obtain a stronger red light blue, and adding CI Pigment Yellow 150 to obtain a stronger yellow light green.

The liquid crystal display (LCD)is a thin, flat display device, which is made up of many number of color or monochrome pixels arrayed in front of a light source or reflector. It is prized for its superb image quality, such as low-voltage power source, low manufacturing cost, compared with other display device including CRT, plasma, projection, etc. Today the LCD device has been widely used in portable electronics such as cell phones, personal computers, medium and also in large size television display.

The LCD device consists of two major components, TFT-LCD panel and Back Light Unit (BLU). As LCD device can not light actively itself, thus a form of illumination, back light unit is needed for its display. While one of the key parts in LCD panel is color filter. The color filter is a film frame consists of RGB primary colors, and its function is to generate three basic colors from the back light source for LCD display. As a whole, back light and color filter are the two vital components of the perfect color display for LCD device.

Traditionally people use the cold cathode fluorescent lamp (CCFL)as the back light source for medium and large size LCD device. However CCFL has several disadvantages. For example, narrow color representation, low efficiency, complex structure, limited life, and the CCFL needs to be driven by a high-voltage inverter, consequently requires more space. Another disadvantage is the environmental problem for the mercury inside it. So people try to find an ideal back light module for LCD display.

Nowadays, the back light technology for LCD device towards the trend of using light emitting devices (LED). For its excellent advantages, the LCD device based on LED back light owns promoted display performance. As a new generation of solid-state light source, LED can produce very narrow spectrum, thus can generate a high color saturation, as a result it provides LCD device delivering a wider color gamut of above 100% of NTSC specification than the only 70% of CCFL back light. Moreover the LED only need DC power drive instead of a DC-AC inverter, so simplifies the back light structure. In a word, LED back light makes LCD obtain quite a higher display quality than the conventional CCFL back light. Despite of these advantages, there are also several challenges for LED back light technology currently, such as efficiency, stable ability, heat dissipation and cost etc. so people are trying to get some substantial breakthrough at the technical problems above to make LED back light as the key technology part for LCD device.

White LED’s are actually blue leds with a yellow phosphor, and thus creating an white impression. This technique allows a colour gamut slightly wider than sRGB, but not very “colourfull”. RGB leds consist of 3 individual colour leds, red, green and blue. These allow an enourmous colour gamut that covers most standards like AdobeRGB and NTSC. Panels with RGB LED’s are much more expensive, as they need much more calibration logic. It is very hard to tame extreme gamut for say sRGB use, and the ballance of the colours is constantly monitored. RGB LED displays are doing twice the price of WLED’s with ease.

This chapter discusses the color patterning technologies, which gives major contribution to cost and productivity. The technologies discussed include shadow mask patterning, white‐color filter method, laser‐induced thermal imaging method, radiation‐induced sublimation transfer method, and dual‐plate OLED display method. Low material utilization can bring high cost, so it is very critical to suppress material consumption during OLED display manufacturing. To address this, various high‐material‐utilization next‐generation OLED manufacturing processes, such as the vapor injection source technology (VIST) method, hot‐wall method, and organic vapor‐phase deposition (OVPD) have been proposed and are discussed in the chapter.

Organic Light-Emitting Diodes (OLEDs) are most famously known for their use in foldable smart phone displays. From the Samsung Galaxy Fold to the Huawei Mate X (2019), these devices offer huge screens that can fold down to the size of a more traditional smartphone screen. This revolutionary new technology is made possible by the properties and composition of OLED screens. In traditional Liquid Crystal Display (LCD) screens, a glass pane covers the actual liquid crystal display that emits the light. On the other hand, OLED screens have the light emitting technology already built into them. Thus, when you touch interact with an OLED device, you are touching the actual display too. OLED screens are often made of a type of plastic, which allows for flexibility and folding screens. These devices also require OLED color patterning techniques in order to integrate color into the display devices, which we will describe further in the upcoming sections.

Now, we will brief on the composition and integration of OLED technology in this plastic screen. OLEDs are made of two or three organic layers sandwiched between two electrodes (cathode and anode) on top of a substrate layer. The organic layers and electrodes emit light in response to an electric current. One of the most difficult processes in manufacturing these OLEDs is attaching the organic layers to the substrate. For example, organic vapor phase deposition and inkjet printing are both efficient methods that can reduce the cost of producing OLED displays.

Another big part of OLED manufacturing is the color patterning step, which allows the OLED device to display color. There are various methods in use for OLED color patterning, including photolithography. Lithography is commonly used for semiconductors and TFTs, but presents challenges for OLEDs. This is due to the high temperature and humid conditions required for attaching OLED layers together. In this article we will explore three different color patterning technologies that have arisen for more efficient and accurate OLED optical manufacturing.

In 2016, a new approach for OLED color patterning was developed at the Fraunhofer Institute for Organic Electronics. Researchers utilized electron beam technology to color pattern the organic layers in the OLED. Because this process acted on the micro-scale, it produced extremely accurate, high-resolution results, even with the help of color filters. Further, it also allowed for complex patterns and high-definition (HD) grayscale images. Since then, this technology has been developed and advanced to that of full-color working OLED displays, without the use of external filters.

As more AMOLED, and flexible displays enter the market, OLED technology will continue to become more popular and widespread. One of the most important considerations for OLED availability in mass market, is in screen color production. Rising techniques such as the Electron Beam Patterning method can produce high quality, low cost, and energy efficiency. Another key consideration in OLED screen production is low material consumption. Further rising techniques in research that allow for low material costs include the vapor injection source technology (VIST) method, hot‐wall method, and organic vapor‐phase deposition (OVPD) [1].

MicroLED is the next generation of display technology. Just like OLED, it produces its own light and therefore is capable of infinite contrast ratio. However, since it doesn’t use organic materials, it won’t deteriorate or burn-in over time.

What’s more, MicroLED displays will be brighter than OLED displays, and you will be able to customize their size, aspect ratio, and resolution (modular displays).

MicroLED is the leading-edge display technology that is yet to be adjusted to the consumer market; in simpler terms, it’s the display technology of the not-so-distant future.

Similarly to OLED (Organic Light Emitting Diode) technology, MicroLED doesn’t rely on a backlight to produce light. Instead, it uses self-emissive microscopic LEDs, which allow for infinite contrast ratio, just like on OLED displays.

Further, MicroLED displays are capable of higher luminance emission in comparison to OLEDs, which will allow for better details in highlights of the picture for a superior HDR (High Dynamic Range) viewing experience.

Lastly, they can have a unique modular characteristic that would allow you to customize the display’s screen size, resolution, and aspect ratio to your liking by arranging and connecting more panels together.Shop Related Products

Mini-LED displays will be cheaper than OLEDs, but not better than them. So, Mini-LED is sort of a display technology in-between the standard LED-backlight LCDs and OLED displays.

First there was LED (light emitting diode) display technology, commercialized in 1994. OLED (organic LED) products came on the market in 1997. Then microLEDs began to emerge in 2010. And now we’ve been hearing about a new display technology category: miniLEDs, poised to enter the market in 2019.1

Though they share many similarities, miniLEDs and microLEDs are also different in some key ways. MicroLEDs are not just shrunken versions of their miniLED sisters. The two LED types have different performance and structures. LEDinside characterized the difference as follows: “Micro LED is a new-generation display technology, a miniaturized LED with matrix. In simple terms, the LED backlight is thinner, miniaturized, and arrayed, with the LED unit smaller than 100 micrometers. Each pixel is individually addressed and driven to emit light (self-emitting), just like OLED…Mini LED is a transitional technology between traditional LED and Micro LED, and is an improved version of traditional LED backlight.”2

MicroLEDs are typically made from Gallium-nitride-based LED materials, which create brighter displays (many times brighter than OLED) with much greater efficiency than traditional LEDs. This makes them attractive for applications that need both brightness and efficiency such as smart watches, and particularly for head-up displays (HUDs) and augmented reality systems that are likely to be viewed against ambient light backgrounds

OLED screen manufacturing has been somewhat costly to date, limiting its adoption primarily to smaller screen sizes like smart phones. Likewise, producing an entire television screen out of microLED chips has so far proven to be challenging. MicroLEDs require new assembly technologies, die structure, and manufacturing infrastructure. For commercialization, fabricators must find methods that yield high quality with microscopic accuracy while also achieving mass-production speeds. For starters, a miniLED backlight screen may be made up of thousands of individual miniLED units; a microLED screen is composed of millions of tiny LEDs.

To fabricate a display, each individual microLED must be transferred to a backplane that holds the array of units in place. The transfer equipment used to place microLED units is required to have a high degree of precision, with placement accurate to within +/- 1.5 µm. Existing pick & place LED assembly equipment can only achieve +/- 34 µm accuracy (multi-chip per transfer). Flip chip bonders typically feature accuracy of +/-1.5 µm—but only for a single unit at a time. Both of these traditional LED transfer methods are not accurate enough for mass production of microLEDs.

Han Jong-hee, president of Samsung Electronics’s video display business, introduces a new 75-inch microLED TV in Las Vegas on January 6, 2019. Photo Source: Business Korea

By contrast, miniLED chips do not present similar production complications. Because they are just smaller versions of traditional LEDs, they can be manufactured in existing fabrication facilities with minimal reconfiguration. This ease means miniLED production is already underway and devices will reach the market this year for applications in gaming displays and signage, followed by backlight products such as smartphones, TVs, virtual reality devices, and automotive displays.

For example, miniLEDs can be used to upgrade existing LCD displays with “ultra-thin, multi-zone local dimming backlight units (BLU) that enable form factors and contrast performance”4 that rival the quality of OLED displays. MiniLEDs also have an advantage as a cost-effective solution for narrow-pixel-pitch LED direct-view displays such as indoor and outdoor digital signage applications.

MicroLEDs do offer high luminous efficiency, brightness, contrast, reliability and a short response time, but they are likely to be priced at more than three times traditional LED screens during initial the initial stages of mass production. MiniLEDs, while they perform more like traditional LEDs, do have advantages when it comes to HDR and notched or curved display designs, and could launch at just 20% above standard LCD panel prices.5 According to PCWorld, “at this stage, the biggest difference between microLED and miniLED for consumers is that microLED is likely to make it to market as a fully-fledged next-generation display technology of its own while miniLED is likely to mostly be used by manufa