lcd panel sits factory

A robotic forklift picks up a sheet of glass thinner than a credit card and as big as two table-tennis tables, and effortlessly swings it 90 degrees before gently placing it into an oven where it will bake at 200 degrees Celsius. It’s a graceful and finely engineered process and one of several that takes place minute after minute, hour after hour, day after day in Sharp’s LCD factory in Sakai, western Japan.

Operations at Sakai began in October, just in time for the competitive year-end sales period, and the factory is already a key supplier of panels for big-screen TVs and one of the reasons why LCD TV prices continue to fall.

At the center of the plant’s claim of world-class status is the size of glass sheets processed. Typically several LCD panels are made on a single sheet of glass to benefit from economies of scale before the glass is cut to produce individual screens. The Sakai plant handles sheets measuring 2.88 meters by 3.13 meters — almost double the size of those at Sharp’s other factory — so LCD panels can be made more efficiently and prices lowered.

The glass panels are made by Corning at a plant next to Sharp’s LCD factory and transported on a conveyer that connects the two. Across the street Dai Nippon Printing and Toppan have factories that produce color filters for the LCD panels. In total 19 companies contribute to a sprawling facility at the center of which sits the LCD factory. Sharp also has a solar cell factory on the land, and there is unoccupied space for expansion.

Looking down from fifth-floor observation windows into one of the clean-room production areas, the sheer scale of the operation was obvious. Photo etching machines, each about 3 meters high and about the size of a tennis court, are lined up one after another for about 200 meters. Inside each sits a 200-ton camera, the largest in the world, according to Sharp.

In other production areas, robots the size of trucks pick up crates holding about 50 sheets of glass and whisk them to other areas of the factory for processing. A wet area is used to wash the glass, drawing around 100,000 tons of water per month through a recycling system while in another area machines check the more than 100 million transistors on each finished panel for faults.

Sharp says its Sakai operations have a comparatively lower impact on the environment than other plants. The larger glass sheets mean more efficient production and a central energy control center collectively manages the energy needs of all the factories on the site. Solar panels on the factory roofs supply 9 megawatts of power and there are plans to double this, while Sharp has also had a hand in constructing a nearby solar farm for Kansai Electric Power.

Sakai can currently handle up to 36,000 sheets of glass per month. Each sheet has enough space for 18 screens in the 40-inch size or 8 screens in the 60-inch size, and two sheets are sandwiched together in each finished screen. The plant is capable of making around 324,000 finished LCD panels per month for 40-inch LCD-TVs or 144,000 panels for 60-inch LCD-TV sets.

Samsung’s display-making subsidiary, Samsung Display initially decided to shut down its LCD business by the end of 2020. The company was reportedly forced to reconsider after the demand for LCD panels increased in the post-pandemic (Covid-19) period. In 2021, more reports suggested that the company again decided to stop producing LCD panels, but Samsung didn’t stop making them. However, according to a report by Sammobile, Samsung Display is now finally ready to shut down its LCD production. The report also suggests that Samsung is now buying LCD panels from China.

As per the report, Samsung might be planning to shut down LCD panel production in June as it doesn’t align with Samsung Display’s long-term vision for the business. The company plans to substitute LCD panels with Quantum Dot (QD-OLED) displays as Samsung recently repurposed an obsolete LCD plant to produce OLED panels.

The company is not willing to compete in a market that’s dominated by affordable panels from Chinese and Taiwanese counterparts. The falling prices of LCD are also preventing Samsung from continuing production, the report claims.

Samsung Display’s largest buyer was the consumer electronics arm of the conglomerate, Samsung Electronics. However, the company itself is opting for affordable LCD panels from Chinese and Taiwanese suppliers. Samsung Display is expected to primarily focus on the manufacturing of Quantum Dot and OLED displays after its LCD business shuts down. The employees appointed for the LCD production are also likely to be transferred to the QD division.

(Reuters) - Foxconn Technology Group is reconsidering plans to make advanced liquid crystal display panels at a $10 billion Wisconsin campus, and said it intends to hire mostly engineers and researchers rather than the manufacturing workforce the project originally promised.

Foxconn, which received controversial state and local incentives for the project, initially planned to manufacture advanced large screen displays for TVs and other consumer and professional products at the facility, which is under construction. It later said it would build smaller LCD screens instead.

Rather than a focus on LCD manufacturing, Foxconn wants to create a “technology hub” in Wisconsin that would largely consist of research facilities along with packaging and assembly operations, Woo said. It would also produce specialized tech products for industrial, healthcare, and professional applications, he added.

Rather than manufacturing LCD panels in the United States, Woo said it would be more profitable to make them in greater China and Japan, ship them to Mexico for final assembly, and import the finished product to the United States.

He said that would represent a supply chain that fits with Foxconn’s current “fluid, good business model.”FILE PHOTO: A shovel and FoxConn logo are seen before the arrival of U.S. President Donald Trump as he participates in the Foxconn Technology Group groundbreaking ceremony for its LCD manufacturing campus, in Mount Pleasant, Wisconsin, U.S., June 28, 2018. REUTERS/Darren Hauck

a line of extreme and ultra-narrow bezel LCD displays that provides a video wall solution for demanding requirements of 24x7 mission-critical applications and high ambient light environments

TOKYO -- Struggling Apple supplier Japan Display plans to sell a smartphone screen factory and the land it sits on to Sharp for 41.2 billion yen ($386 million), the company has announced.

Glass substrate with ITO electrodes. The shapes of these electrodes will determine the shapes that will appear when the LCD is switched ON. Vertical ridges etched on the surface are smooth.

A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directlybacklight or reflector to produce images in color or monochrome.seven-segment displays, as in a digital clock, are all good examples of devices with these displays. They use the same basic technology, except that arbitrary images are made from a matrix of small pixels, while other displays have larger elements. LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement. For example, a character positive LCD with a backlight will have black lettering on a background that is the color of the backlight, and a character negative LCD will have a black background with the letters being of the same color as the backlight. Optical filters are added to white on blue LCDs to give them their characteristic appearance.

LCDs are used in a wide range of applications, including LCD televisions, computer monitors, instrument panels, aircraft cockpit displays, and indoor and outdoor signage. Small LCD screens are common in LCD projectors and portable consumer devices such as digital cameras, watches, digital clocks, calculators, and mobile telephones, including smartphones. LCD screens are also used on consumer electronics products such as DVD players, video game devices and clocks. LCD screens have replaced heavy, bulky cathode-ray tube (CRT) displays in nearly all applications. LCD screens are available in a wider range of screen sizes than CRT and plasma displays, with LCD screens available in sizes ranging from tiny digital watches to very large television receivers. LCDs are slowly being replaced by OLEDs, which can be easily made into different shapes, and have a lower response time, wider color gamut, virtually infinite color contrast and viewing angles, lower weight for a given display size and a slimmer profile (because OLEDs use a single glass or plastic panel whereas LCDs use two glass panels; the thickness of the panels increases with size but the increase is more noticeable on LCDs) and potentially lower power consumption (as the display is only "on" where needed and there is no backlight). OLEDs, however, are more expensive for a given display size due to the very expensive electroluminescent materials or phosphors that they use. Also due to the use of phosphors, OLEDs suffer from screen burn-in and there is currently no way to recycle OLED displays, whereas LCD panels can be recycled, although the technology required to recycle LCDs is not yet widespread. Attempts to maintain the competitiveness of LCDs are quantum dot displays, marketed as SUHD, QLED or Triluminos, which are displays with blue LED backlighting and a Quantum-dot enhancement film (QDEF) that converts part of the blue light into red and green, offering similar performance to an OLED display at a lower price, but the quantum dot layer that gives these displays their characteristics can not yet be recycled.

Since LCD screens do not use phosphors, they rarely suffer image burn-in when a static image is displayed on a screen for a long time, e.g., the table frame for an airline flight schedule on an indoor sign. LCDs are, however, susceptible to image persistence.battery-powered electronic equipment more efficiently than a CRT can be. By 2008, annual sales of televisions with LCD screens exceeded sales of CRT units worldwide, and the CRT became obsolete for most purposes.

Each pixel of an LCD typically consists of a layer of molecules aligned between two transparent electrodes, often made of Indium-Tin oxide (ITO) and two polarizing filters (parallel and perpendicular polarizers), the axes of transmission of which are (in most of the cases) perpendicular to each other. Without the liquid crystal between the polarizing filters, light passing through the first filter would be blocked by the second (crossed) polarizer. Before an electric field is applied, the orientation of the liquid-crystal molecules is determined by the alignment at the surfaces of electrodes. In a twisted nematic (TN) device, the surface alignment directions at the two electrodes are perpendicular to each other, and so the molecules arrange themselves in a helical structure, or twist. This induces the rotation of the polarization of the incident light, and the device appears gray. If the applied voltage is large enough, the liquid crystal molecules in the center of the layer are almost completely untwisted and the polarization of the incident light is not rotated as it passes through the liquid crystal layer. This light will then be mainly polarized perpendicular to the second filter, and thus be blocked and the pixel will appear black. By controlling the voltage applied across the liquid crystal layer in each pixel, light can be allowed to pass through in varying amounts thus constituting different levels of gray.

The chemical formula of the liquid crystals used in LCDs may vary. Formulas may be patented.Sharp Corporation. The patent that covered that specific mixture expired.

Most color LCD systems use the same technique, with color filters used to generate red, green, and blue subpixels. The LCD color filters are made with a photolithography process on large glass sheets that are later glued with other glass sheets containing a TFT array, spacers and liquid crystal, creating several color LCDs that are then cut from one another and laminated with polarizer sheets. Red, green, blue and black photoresists (resists) are used. All resists contain a finely ground powdered pigment, with particles being just 40 nanometers across. The black resist is the first to be applied; this will create a black grid (known in the industry as a black matrix) that will separate red, green and blue subpixels from one another, increasing contrast ratios and preventing light from leaking from one subpixel onto other surrounding subpixels.Super-twisted nematic LCD, where the variable twist between tighter-spaced plates causes a varying double refraction birefringence, thus changing the hue.

LCD in a Texas Instruments calculator with top polarizer removed from device and placed on top, such that the top and bottom polarizers are perpendicular. As a result, the colors are inverted.

The optical effect of a TN device in the voltage-on state is far less dependent on variations in the device thickness than that in the voltage-off state. Because of this, TN displays with low information content and no backlighting are usually operated between crossed polarizers such that they appear bright with no voltage (the eye is much more sensitive to variations in the dark state than the bright state). As most of 2010-era LCDs are used in television sets, monitors and smartphones, they have high-resolution matrix arrays of pixels to display arbitrary images using backlighting with a dark background. When no image is displayed, different arrangements are used. For this purpose, TN LCDs are operated between parallel polarizers, whereas IPS LCDs feature crossed polarizers. In many applications IPS LCDs have replaced TN LCDs, particularly in smartphones. Both the liquid crystal material and the alignment layer material contain ionic compounds. If an electric field of one particular polarity is applied for a long period of time, this ionic material is attracted to the surfaces and degrades the device performance. This is avoided either by applying an alternating current or by reversing the polarity of the electric field as the device is addressed (the response of the liquid crystal layer is identical, regardless of the polarity of the applied field).

Displays for a small number of individual digits or fixed symbols (as in digital watches and pocket calculators) can be implemented with independent electrodes for each segment.alphanumeric or variable graphics displays are usually implemented with pixels arranged as a matrix consisting of electrically connected rows on one side of the LC layer and columns on the other side, which makes it possible to address each pixel at the intersections. The general method of matrix addressing consists of sequentially addressing one side of the matrix, for example by selecting the rows one-by-one and applying the picture information on the other side at the columns row-by-row. For details on the various matrix addressing schemes see passive-matrix and active-matrix addressed LCDs.

LCDs, along with OLED displays, are manufactured in cleanrooms borrowing techniques from semiconductor manufacturing and using large sheets of glass whose size has increased over time. Several displays are manufactured at the same time, and then cut from the sheet of glass, also known as the mother glass or LCD glass substrate. The increase in size allows more displays or larger displays to be made, just like with increasing wafer sizes in semiconductor manufacturing. The glass sizes are as follows:

Until Gen 8, manufacturers would not agree on a single mother glass size and as a result, different manufacturers would use slightly different glass sizes for the same generation. Some manufacturers have adopted Gen 8.6 mother glass sheets which are only slightly larger than Gen 8.5, allowing for more 50 and 58 inch LCDs to be made per mother glass, specially 58 inch LCDs, in which case 6 can be produced on a Gen 8.6 mother glass vs only 3 on a Gen 8.5 mother glass, significantly reducing waste.AGC Inc., Corning Inc., and Nippon Electric Glass.

In 1922, Georges Friedel described the structure and properties of liquid crystals and classified them in three types (nematics, smectics and cholesterics). In 1927, Vsevolod Frederiks devised the electrically switched light valve, called the Fréedericksz transition, the essential effect of all LCD technology. In 1936, the Marconi Wireless Telegraph company patented the first practical application of the technology, "The Liquid Crystal Light Valve". In 1962, the first major English language publication Molecular Structure and Properties of Liquid Crystals was published by Dr. George W. Gray.RCA found that liquid crystals had some interesting electro-optic characteristics and he realized an electro-optical effect by generating stripe-patterns in a thin layer of liquid crystal material by the application of a voltage. This effect is based on an electro-hydrodynamic instability forming what are now called "Williams domains" inside the liquid crystal.

In the late 1960s, pioneering work on liquid crystals was undertaken by the UK"s Royal Radar Establishment at Malvern, England. The team at RRE supported ongoing work by George William Gray and his team at the University of Hull who ultimately discovered the cyanobiphenyl liquid crystals, which had correct stability and temperature properties for application in LCDs.

The idea of a TFT-based liquid-crystal display (LCD) was conceived by Bernard Lechner of RCA Laboratories in 1968.dynamic scattering mode (DSM) LCD that used standard discrete MOSFETs.

On December 4, 1970, the twisted nematic field effect (TN) in liquid crystals was filed for patent by Hoffmann-LaRoche in Switzerland, (Swiss patent No. 532 261) with Wolfgang Helfrich and Martin Schadt (then working for the Central Research Laboratories) listed as inventors.Brown, Boveri & Cie, its joint venture partner at that time, which produced TN displays for wristwatches and other applications during the 1970s for the international markets including the Japanese electronics industry, which soon produced the first digital quartz wristwatches with TN-LCDs and numerous other products. James Fergason, while working with Sardari Arora and Alfred Saupe at Kent State University Liquid Crystal Institute, filed an identical patent in the United States on April 22, 1971.ILIXCO (now LXD Incorporated), produced LCDs based on the TN-effect, which soon superseded the poor-quality DSM types due to improvements of lower operating voltages and lower power consumption. Tetsuro Hama and Izuhiko Nishimura of Seiko received a US patent dated February 1971, for an electronic wristwatch incorporating a TN-LCD.

In 1972, the concept of the active-matrix thin-film transistor (TFT) liquid-crystal display panel was prototyped in the United States by T. Peter Brody"s team at Westinghouse, in Pittsburgh, Pennsylvania.Westinghouse Research Laboratories demonstrated the first thin-film-transistor liquid-crystal display (TFT LCD).high-resolution and high-quality electronic visual display devices use TFT-based active matrix displays.active-matrix liquid-crystal display (AM LCD) in 1974, and then Brody coined the term "active matrix" in 1975.

In 1972 North American Rockwell Microelectronics Corp introduced the use of DSM LCDs for calculators for marketing by Lloyds Electronics Inc, though these required an internal light source for illumination.Sharp Corporation followed with DSM LCDs for pocket-sized calculators in 1973Seiko and its first 6-digit TN-LCD quartz wristwatch, and Casio"s "Casiotron". Color LCDs based on Guest-Host interaction were invented by a team at RCA in 1968.TFT LCDs similar to the prototypes developed by a Westinghouse team in 1972 were patented in 1976 by a team at Sharp consisting of Fumiaki Funada, Masataka Matsuura, and Tomio Wada,

In 1983, researchers at Brown, Boveri & Cie (BBC) Research Center, Switzerland, invented the passive matrix-addressed LCDs. H. Amstutz et al. were listed as inventors in the corresponding patent applications filed in Switzerland on July 7, 1983, and October 28, 1983. Patents were granted in Switzerland CH 665491, Europe EP 0131216,

The first color LCD televisions were developed as handheld televisions in Japan. In 1980, Hattori Seiko"s R&D group began development on color LCD pocket televisions.Seiko Epson released the first LCD television, the Epson TV Watch, a wristwatch equipped with a small active-matrix LCD television.dot matrix TN-LCD in 1983.Citizen Watch,TFT LCD.computer monitors and LCD televisions.3LCD projection technology in the 1980s, and licensed it for use in projectors in 1988.compact, full-color LCD projector.

In 1990, under different titles, inventors conceived electro optical effects as alternatives to twisted nematic field effect LCDs (TN- and STN- LCDs). One approach was to use interdigital electrodes on one glass substrate only to produce an electric field essentially parallel to the glass substrates.Germany by Guenter Baur et al. and patented in various countries.Hitachi work out various practical details of the IPS technology to interconnect the thin-film transistor array as a matrix and to avoid undesirable stray fields in between pixels.

Hitachi also improved the viewing angle dependence further by optimizing the shape of the electrodes (Super IPS). NEC and Hitachi become early manufacturers of active-matrix addressed LCDs based on the IPS technology. This is a milestone for implementing large-screen LCDs having acceptable visual performance for flat-panel computer monitors and television screens. In 1996, Samsung developed the optical patterning technique that enables multi-domain LCD. Multi-domain and In Plane Switching subsequently remain the dominant LCD designs through 2006.South Korea and Taiwan,

In 2007 the image quality of LCD televisions surpassed the image quality of cathode-ray-tube-based (CRT) TVs.LCD TVs were projected to account 50% of the 200 million TVs to be shipped globally in 2006, according to Displaybank.Toshiba announced 2560 × 1600 pixels on a 6.1-inch (155 mm) LCD panel, suitable for use in a tablet computer,transparent and flexible, but they cannot emit light without a backlight like OLED and microLED, which are other technologies that can also be made flexible and transparent.

In 2016, Panasonic developed IPS LCDs with a contrast ratio of 1,000,000:1, rivaling OLEDs. This technology was later put into mass production as dual layer, dual panel or LMCL (Light Modulating Cell Layer) LCDs. The technology uses 2 liquid crystal layers instead of one, and may be used along with a mini-LED backlight and quantum dot sheets.

Since LCDs produce no light of their own, they require external light to produce a visible image.backlight. Active-matrix LCDs are almost always backlit.Transflective LCDs combine the features of a backlit transmissive display and a reflective display.

CCFL: The LCD panel is lit either by two cold cathode fluorescent lamps placed at opposite edges of the display or an array of parallel CCFLs behind larger displays. A diffuser (made of PMMA acrylic plastic, also known as a wave or light guide/guiding plateinverter to convert whatever DC voltage the device uses (usually 5 or 12 V) to ≈1000 V needed to light a CCFL.

EL-WLED: The LCD panel is lit by a row of white LEDs placed at one or more edges of the screen. A light diffuser (light guide plate, LGP) is then used to spread the light evenly across the whole display, similarly to edge-lit CCFL LCD backlights. The diffuser is made out of either PMMA plastic or special glass, PMMA is used in most cases because it is rugged, while special glass is used when the thickness of the LCD is of primary concern, because it doesn"t expand as much when heated or exposed to moisture, which allows LCDs to be just 5mm thick. Quantum dots may be placed on top of the diffuser as a quantum dot enhancement film (QDEF, in which case they need a layer to be protected from heat and humidity) or on the color filter of the LCD, replacing the resists that are normally used.

WLED array: The LCD panel is lit by a full array of white LEDs placed behind a diffuser behind the panel. LCDs that use this implementation will usually have the ability to dim or completely turn off the LEDs in the dark areas of the image being displayed, effectively increasing the contrast ratio of the display. The precision with which this can be done will depend on the number of dimming zones of the display. The more dimming zones, the more precise the dimming, with less obvious blooming artifacts which are visible as dark grey patches surrounded by the unlit areas of the LCD. As of 2012, this design gets most of its use from upscale, larger-screen LCD televisions.

RGB-LED array: Similar to the WLED array, except the panel is lit by a full array of RGB LEDs. While displays lit with white LEDs usually have a poorer color gamut than CCFL lit displays, panels lit with RGB LEDs have very wide color gamuts. This implementation is most popular on professional graphics editing LCDs. As of 2012, LCDs in this category usually cost more than $1000. As of 2016 the cost of this category has drastically reduced and such LCD televisions obtained same price levels as the former 28" (71 cm) CRT based categories.

Monochrome LEDs: such as red, green, yellow or blue LEDs are used in the small passive monochrome LCDs typically used in clocks, watches and small appliances.

Today, most LCD screens are being designed with an LED backlight instead of the traditional CCFL backlight, while that backlight is dynamically controlled with the video information (dynamic backlight control). The combination with the dynamic backlight control, invented by Philips researchers Douglas Stanton, Martinus Stroomer and Adrianus de Vaan, simultaneously increases the dynamic range of the display system (also marketed as HDR, high dynamic range television or FLAD, full-area local area dimming).

The LCD backlight systems are made highly efficient by applying optical films such as prismatic structure (prism sheet) to gain the light into the desired viewer directions and reflective polarizing films that recycle the polarized light that was formerly absorbed by the first polarizer of the LCD (invented by Philips researchers Adrianus de Vaan and Paulus Schaareman),

Due to the LCD layer that generates the desired high resolution images at flashing video speeds using very low power electronics in combination with LED based backlight technologies, LCD technology has become the dominant display technology for products such as televisions, desktop monitors, notebooks, tablets, smartphones and mobile phones. Although competing OLED technology is pushed to the market, such OLED displays do not feature the HDR capabilities like LCDs in combination with 2D LED backlight technologies have, reason why the annual market of such LCD-based products is still growing faster (in volume) than OLED-based products while the efficiency of LCDs (and products like portable computers, mobile phones and televisions) may even be further improved by preventing the light to be absorbed in the colour filters of the LCD.

A pink elastomeric connector mating an LCD panel to circuit board traces, shown next to a centimeter-scale ruler. The conductive and insulating layers in the black stripe are very small.

A standard television receiver screen, a modern LCD panel, has over six million pixels, and they are all individually powered by a wire network embedded in the screen. The fine wires, or pathways, form a grid with vertical wires across the whole screen on one side of the screen and horizontal wires across the whole screen on the other side of the screen. To this grid each pixel has a positive connection on one side and a negative connection on the other side. So the total amount of wires needed for a 1080p display is 3 x 1920 going vertically and 1080 going horizontally for a total of 6840 wires horizontally and vertically. That"s three for red, green and blue and 1920 columns of pixels for each color for a total of 5760 wires going vertically and 1080 rows of wires going horizontally. For a panel that is 28.8 inches (73 centimeters) wide, that means a wire density of 200 wires per inch along the horizontal edge.

The LCD panel is powered by LCD drivers that are carefully matched up with the edge of the LCD panel at the factory level. The drivers may be installed using several methods, the most common of which are COG (Chip-On-Glass) and TAB (Tape-automated bonding) These same principles apply also for smartphone screens that are much smaller than TV screens.anisotropic conductive film or, for lower densities, elastomeric connectors.

Monochrome and later color passive-matrix LCDs were standard in most early laptops (although a few used plasma displaysGame Boyactive-matrix became standard on all laptops. The commercially unsuccessful Macintosh Portable (released in 1989) was one of the first to use an active-matrix display (though still monochrome). Passive-matrix LCDs are still used in the 2010s for applications less demanding than laptop computers and TVs, such as inexpensive calculators. In particular, these are used on portable devices where less information content needs to be displayed, lowest power consumption (no backlight) and low cost are desired or readability in direct sunlight is needed.

STN LCDs have to be continuously refreshed by alternating pulsed voltages of one polarity during one frame and pulses of opposite polarity during the next frame. Individual pixels are addressed by the corresponding row and column circuits. This type of display is called response times and poor contrast are typical of passive-matrix addressed LCDs with too many pixels and driven according to the "Alt & Pleshko" drive scheme. Welzen and de Vaan also invented a non RMS drive scheme enabling to drive STN displays with video rates and enabling to show smooth moving video images on an STN display.

Bistable LCDs do not require continuous refreshing. Rewriting is only required for picture information changes. In 1984 HA van Sprang and AJSM de Vaan invented an STN type display that could be operated in a bistable mode, enabling extremely high resolution images up to 4000 lines or more using only low voltages.

High-resolution color displays, such as modern LCD computer monitors and televisions, use an active-matrix structure. A matrix of thin-film transistors (TFTs) is added to the electrodes in contact with the LC layer. Each pixel has its own dedicated transistor, allowing each column line to access one pixel. When a row line is selected, all of the column lines are connected to a row of pixels and voltages corresponding to the picture information are driven onto all of the column lines. The row line is then deactivated and the next row line is selected. All of the row lines are selected in sequence during a refresh operation. Active-matrix addressed displays look brighter and sharper than passive-matrix addressed displays of the same size, and generally have quicker response times, producing much better images. Sharp produces bistable reflective LCDs with a 1-bit SRAM cell per pixel that only requires small amounts of power to maintain an image.

Segment LCDs can also have color by using Field Sequential Color (FSC LCD). This kind of displays have a high speed passive segment LCD panel with an RGB backlight. The backlight quickly changes color, making it appear white to the naked eye. The LCD panel is synchronized with the backlight. For example, to make a segment appear red, the segment is only turned ON when the backlight is red, and to make a segment appear magenta, the segment is turned ON when the backlight is blue, and it continues to be ON while the backlight becomes red, and it turns OFF when the backlight becomes green. To make a segment appear black, the segment is always turned ON. An FSC LCD divides a color image into 3 images (one Red, one Green and one Blue) and it displays them in order. Due to persistence of vision, the 3 monochromatic images appear as one color image. An FSC LCD needs an LCD panel with a refresh rate of 180 Hz, and the response time is reduced to just 5 milliseconds when compared with normal STN LCD panels which have a response time of 16 milliseconds.

Samsung introduced UFB (Ultra Fine & Bright) displays back in 2002, utilized the super-birefringent effect. It has the luminance, color gamut, and most of the contrast of a TFT-LCD, but only consumes as much power as an STN display, according to Samsung. It was being used in a variety of Samsung cellular-telephone models produced until late 2006, when Samsung stopped producing UFB displays. UFB displays were also used in certain models of LG mobile phones.

In-plane switching is an LCD technology that aligns the liquid crystals in a plane parallel to the glass substrates. In this method, the electrical field is applied through opposite electrodes on the same glass substrate, so that the liquid crystals can be reoriented (switched) essentially in the same plane, although fringe fields inhibit a homogeneous reorientation. This requires two transistors for each pixel instead of the single transistor needed for a standard thin-film transistor (TFT) display. The IPS technology is used in everything from televisions, computer monitors, and even wearable devices, especially almost all LCD smartphone panels are IPS/FFS mode. IPS displays belong to the LCD panel family screen types. The other two types are VA and TN. Before LG Enhanced IPS was introduced in 2001 by Hitachi as 17" monitor in Market, the additional transistors resulted in blocking more transmission area, thus requiring a brighter backlight and consuming more power, making this type of display less desirable for notebook computers. Panasonic Himeji G8.5 was using an enhanced version of IPS, also LGD in Korea, then currently the world biggest LCD panel manufacture BOE in China is also IPS/FFS mode TV panel.

In 2015 LG Display announced the implementation of a new technology called M+ which is the addition of white subpixel along with the regular RGB dots in their IPS panel technology.

In 2011, LG claimed the smartphone LG Optimus Black (IPS LCD (LCD NOVA)) has the brightness up to 700 nits, while the competitor has only IPS LCD with 518 nits and double an active-matrix OLED (AMOLED) display with 305 nits. LG also claimed the NOVA display to be 50 percent more efficient than regular LCDs and to consume only 50 percent of the power of AMOLED displays when producing white on screen.

This pixel-layout is found in S-IPS LCDs. A chevron shape is used to widen the viewing cone (range of viewing directions with good contrast and low color shift).

Vertical-alignment displays are a form of LCDs in which the liquid crystals naturally align vertically to the glass substrates. When no voltage is applied, the liquid crystals remain perpendicular to the substrate, creating a black display between crossed polarizers. When voltage is applied, the liquid crystals shift to a tilted position, allowing light to pass through and create a gray-scale display depending on the amount of tilt generated by the electric field. It has a deeper-black background, a higher contrast ratio, a wider viewing angle, and better image quality at extreme temperatures than traditional twisted-nematic displays.

Blue phase mode LCDs have been shown as engineering samples early in 2008, but they are not in mass-production. The physics of blue phase mode LCDs suggest that very short switching times (≈1 ms) can be achieved, so time sequential color control can possibly be realized and expensive color filters would be obsolete.

Some LCD panels have defective transistors, causing permanently lit or unlit pixels which are commonly referred to as stuck pixels or dead pixels respectively. Unlike integrated circuits (ICs), LCD panels with a few defective transistors are usually still usable. Manufacturers" policies for the acceptable number of defective pixels vary greatly. At one point, Samsung held a zero-tolerance policy for LCD monitors sold in Korea.ISO 13406-2 standard.

Dead pixel policies are often hotly debated between manufacturers and customers. To regulate the acceptability of defects and to protect the end user, ISO released the ISO 13406-2 standard,ISO 9241, specifically ISO-9241-302, 303, 305, 307:2008 pixel defects. However, not every LCD manufacturer conforms to the ISO standard and the ISO standard is quite often interpreted in different ways. LCD panels are more likely to have defects than most ICs due to their larger size. For example, a 300 mm SVGA LCD has 8 defects and a 150 mm wafer has only 3 defects. However, 134 of the 137 dies on the wafer will be acceptable, whereas rejection of the whole LCD panel would be a 0% yield. In recent years, quality control has been improved. An SVGA LCD panel with 4 defective pixels is usually considered defective and customers can request an exchange for a new one.

Some manufacturers, notably in South Korea where some of the largest LCD panel manufacturers, such as LG, are located, now have a zero-defective-pixel guarantee, which is an extra screening process which can then determine "A"- and "B"-grade panels.clouding (or less commonly mura), which describes the uneven patches of changes in luminance. It is most visible in dark or black areas of displayed scenes.

The zenithal bistable device (ZBD), developed by Qinetiq (formerly DERA), can retain an image without power. The crystals may exist in one of two stable orientations ("black" and "white") and power is only required to change the image. ZBD Displays is a spin-off company from QinetiQ who manufactured both grayscale and color ZBD devices. Kent Displays has also developed a "no-power" display that uses polymer stabilized cholesteric liquid crystal (ChLCD). In 2009 Kent demonstrated the use of a ChLCD to cover the entire surface of a mobile phone, allowing it to change colors, and keep that color even when power is removed.

In 2004, researchers at the University of Oxford demonstrated two new types of zero-power bistable LCDs based on Zenithal bistable techniques.e.g., BiNem technology, are based mainly on the surface properties and need specific weak anchoring materials.

Resolution The resolution of an LCD is expressed by the number of columns and rows of pixels (e.g., 1024×768). Each pixel is usually composed 3 sub-pixels, a red, a green, and a blue one. This had been one of the few features of LCD performance that remained uniform among different designs. However, there are newer designs that share sub-pixels among pixels and add Quattron which attempt to efficiently increase the perceived resolution of a display without increasing the actual resolution, to mixed results.

Spatial performance: For a computer monitor or some other display that is being viewed from a very close distance, resolution is often expressed in terms of dot pitch or pixels per inch, which is consistent with the printing industry. Display density varies per application, with televisions generally having a low density for long-distance viewing and portable devices having a high density for close-range detail. The Viewing Angle of an LCD may be important depending on the display and its usage, the limitations of certain display technologies mean the display only displays accurately at certain angles.

Temporal performance: the temporal resolution of an LCD is how well it can display changing images, or the accuracy and the number of times per second the display draws the data it is being given. LCD pixels do not flash on/off between frames, so LCD monitors exhibit no refresh-induced flicker no matter how low the refresh rate.

Brightness and contrast ratio: Contrast ratio is the ratio of the brightness of a full-on pixel to a full-off pixel. The LCD itself is only a light valve and does not generate light; the light comes from a backlight that is either fluorescent or a set of LEDs. Brightness is usually stated as the maximum light output of the LCD, which can vary greatly based on the transparency of the LCD and the brightness of the backlight. Brighter backlight allows stronger contrast and higher dynamic range (HDR displays are graded in peak luminance), but there is always a trade-off between brightness and power consumption.

Usually no refresh-rate flicker, because the LCD pixels hold their state between refreshes (which are usually done at 200 Hz or faster, regardless of the input refresh rate).

No theoretical resolution limit. When multiple LCD panels are used together to create a single canvas, each additional panel increases the total resolution of the display, which is commonly called stacked resolution.

As an inherently digital device, the LCD can natively display digital data from a DVI or HDMI connection without requiring conversion to analog. Some LCD panels have native fiber optic inputs in addition to DVI and HDMI.

As of 2012, most implementations of LCD backlighting use pulse-width modulation (PWM) to dim the display,CRT monitor at 85 Hz refresh rate would (this is because the entire screen is strobing on and off rather than a CRT"s phosphor sustained dot which continually scans across the display, leaving some part of the display always lit), causing severe eye-strain for some people.LED-backlit monitors, because the LEDs switch on and off faster than a CCFL lamp.

Fixed bit depth (also called color depth). Many cheaper LCDs are only able to display 262144 (218) colors. 8-bit S-IPS panels can display 16 million (224) colors and have significantly better black level, but are expensive and have slower response time.

Input lag, because the LCD"s A/D converter waits for each frame to be completely been output before drawing it to the LCD panel. Many LCD monitors do post-processing before displaying the image in an attempt to compensate for poor color fidelity, which adds an additional lag. Further, a video scaler must be used when displaying non-native resolutions, which adds yet more time lag. Scaling and post processing are usually done in a single chip on modern monitors, but each function that chip performs adds some delay. Some displays have a video gaming mode which disables all or most processing to reduce perceivable input lag.

Loss of brightness and much slower response times in low temperature environments. In sub-zero environments, LCD screens may cease to function without the use of supplemental heating.

The production of LCD screens uses nitrogen trifluoride (NF3) as an etching fluid during the production of the thin-film components. NF3 is a potent greenhouse gas, and its relatively long half-life may make it a potentially harmful contributor to global warming. A report in Geophysical Research Letters suggested that its effects were theoretically much greater than better-known sources of greenhouse gasses like carbon dioxide. As NF3 was not in widespread use at the time, it was not made part of the Kyoto Protocols and has been deemed "the missing greenhouse gas".

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Explanation of CCFL backlighting details, "Design News — Features — How to Backlight an LCD" Archived January 2, 2014, at the Wayback Machine, Randy Frank, Retrieved January 2013.

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American Sign Factory LLC, a sign and awning design, manufacturing and installation firm with operations in Milwaukee and metropolitan Chicago, recently created a new division that will specialize in interior LCD signs and interactive displays.

The company began thinking about offering LCD signs and displays in the fall, after one of its clients asked if American Sign Factory could build them one.

The LCD displays consist of a commercial-grade LCD TV or monitor and a small, stripped down computer with an Internet connection. New screens, slides and content can be uploaded to the media player at the customer’s location or from another site, with use of a secure location. And because American Sign Factory already knows how to create custom signs, the company can create a wide variety of different sign bodies to put the LCD displays inside, Uditsky said.

American Sign Factory is now pitching its interior LCD signs and displays to retail chains, restaurants, theaters, hotels, banks and corporate lobbies.

Late last year, the company laid off a few of its manufacturing workers, but was able to reassign one worker to a sales position related to the new LCD division.

Today’s vivid, immersive displays rely on layers of Corning glass to provide a stunning viewing experience. Wherever you look for news and entertainment, chances are Corning glass is there, too. We are the science and engineering powerhouse behind revolutionary display inventions, including glass cathode-ray bulbs for the first televisions and the LCD glass that made smartphones and laptop computers commonplace. We set the standard for the industry with Corning® EAGLE XG® Slim Glass substrates, manufacturing over 25 billion square feet — enough to pave the Great Wall of China 25 times, or cover nearly 390,000 football fields — while eliminating the equivalent of 6,000 truckloads of heavy metals from entering the environment. Today, we continue to enable the display industry and emerging technologies with our three-glass portfolio.

New design freedoms are taking shape with Corning LotusTMNXT Glass. Thanks to Corning Lotus NXT Glass, devices with OLED displays that curve, flex, or extend edge-to-edge across a device are all within reach.  Flexible OLED devices use a plastic backplane substrate, which calls for Corning’s high-tech display glass to enable the manufacturing process —to date, it"s enabled more than 2 billion OLED devices. Corning Lotus NXT Glass continues to emerge as the leader most-advantaged glass for rigid and flexible OLED panels – outperforming competitors and enabling the designs and performance that consumers love.

Looking beyond incumbent LCD and OLED display technology, Corning"s display portfolio is finding new opportunities in emerging technology applications, including Quantum Dot, Micro LED and Mini LED. With our proven track record of successfully navigating the display technology roadmap, our proprietary fusion manufacturing platform and reliable supply network, our commitment to our customers and innovation, and our innovative portfolio, we are excited to support the next generation of displays.

In the past decade, LCD monitors have replaced CRT screens for all but the most specialist applications. Although liquid crystal displays boast perfect

Hopes were high among the employees who joined Foxconn’s Wisconsin project in the summer of 2018. In June, President Donald Trump had broken ground on an LCD factory he called “the eighth wonder of the world.” The scale of the promise was indeed enormous: a $10 billion investment from the Taiwanese electronics giant, a 20 million-square-foot manufacturing complex, and, most importantly, 13,000 jobs.

The renovations never arrived. Neither did the factory, the tech campus, nor the thousands of jobs. Interviews with 19 employees and dozens of others involved with the project, as well as thousands of pages of public documents, reveal a project that has defaulted on almost every promise. The building Foxconn calls an LCD factory — about 1/20th the size of the original plan — is little more than an empty shell. In September, Foxconn received a permit to change its intended use from manufacturing to storage.

Foxconn said it would build a 20 million-square-foot LCD complex. Instead, it constructed an empty building 1/20th that size it calls the “Fab.” Records show Foxconn recently changed the intended use of the building from manufacturing to storage.

Despite publicly insisting it was building an LCD factory, as early as 2018, Foxconn employees had been asked to figure out a business plan for the company in Wisconsin.

Foxconn Industrial Internet, a Foxconn spinoff run by Jay Lee and Brand Cheng that was placed in charge of the Wisconsin deal in May 2019 after the LCD group stalled. Importantly, Fii is not part of the original contract with the state of Wisconsin.

From a political perspective, Gou could hardly have done better than the Wisconsin deal: a factory in a swing state Trump narrowly won, where the Republican governor was campaigning for reelection on job creation, in the district of then-Speaker of the House Paul Ryan and Wisconsin State Assembly Speaker Robin Vos. From a business perspective, the project made less sense. Experts noted an impending glut in LCDs that would drive down prices, high local labor costs that would obliterate the industry’s thin margins, and a lack of key suppliers like the glass-maker Corning that would have to be paid to come to Wisconsin as well. Undeterred, the Trump administration arranged an April meeting between Gou and Walker, who proceeded to pursue Foxconn aggressively.

Even then, Foxconn was highly fluid about what exactly it was going to build. The company had originally floated two possible factories, a “generation 10.5 fabrication facility,” or “Gen 10.5 Fab,” which would manufacture large LCD screens and employ 8,800 people, or a smaller Gen 6 to make smaller LCDs and employ 5,200 people, according to a request for proposal obtained by The Verge. But Foxconn wanted $3 billion in subsidies, according to a source involved with the project, and Walker wanted a five-figure jobs number.

A bulldozer at the Foxconn site in Mount Pleasant. Foxconn routinely brags about how much dirt it has moved in Wisconsin. It has yet to produce any LCDs.

The election results fell like “a dark cloud” over Foxconn’s Milwaukee headquarters, in the words of one employee. The company had little progress to show the new administration. Rather than the 1,040 people Foxconn intended to hire by the end of 2018, per its contract with the state, or even the 260 needed in order to receive subsidies, an audit found the company had managed to hire only 113. At the Mount Pleasant campus, it had erected a single structure, a 120,000-square-foot space that sat virtually empty. Its very name, “the multi-purpose building,” seemed noncommittal. As for the promised LCD factory, the “Fab,” Foxconn boasted in a letter that a contractor had moved 4 million cubic yards of dirt. As 2018 came to an end, the company froze budgets and canceled planned career fairs. The project entered a complete stall.

The problem, employees soon learned, was that Foxconn’s planning did not extend far beyond the broad promises made to Wisconsin officials: an enormous LCD plant, some other manufacturing, lots of jobs. There appeared to be no research into the market for products Foxconn might make or the costs of producing those products in Wisconsin. Employees know this because many of them, no matter what role they had been hired for, were told to figure out what Foxconn should do in Wisconsin themselves.

At one point, people were stuck without desks at the Milwaukee headquarters because the Foxconn subsidiaries they worked for refused to pay rent to FEWI, according to one employee. Recruiters say the Foxconn subsidiary charged with LCD manufacturing was slow to hire and seemed uninterested in moving the project forward. “They were never really there,” said one recruiter. “Then it just kind of fizzled.”

Foxconn’s vacillations spilled into public view in January 2019, when Woo told Reuters, “In Wisconsin we’re not building a factory,” having finally discovered it was unprofitable to make LCDs in the US. The comment caused an uproar. State Republicans swiftly blamed Evers for driving Foxconn out; the administration expressed surprise at the change; Trump spoke with Gou, and Foxconn immediately announced that LCD production was back on. “Great news on Foxconn in Wisconsin after my conversation with Terry Gou!” Trump tweeted, claiming credit for bringing Foxconn to Wisconsin a second time.

The centerpiece of the project. What was first meant to be an enormous Gen 10.5 LCD factory, then scaled down to a far smaller Gen 6, and now an empty shell of a building. In September, Foxconn received a permit to use it for storage.

With Blaze stalled, employees began convening to discuss literally any other idea to make money. They searched for things in Wisconsin they could export to China: cosmetics, designer handbags, ice cream, carp. Yeung asked them to draw up a plan for building an aquaponic fish farm in Mount Pleasant, having been inspired by a company in northern Wisconsin and reasoning that Foxconn had access to cheap water the state provided for LCD manufacturing. They briefly explored doing something with esports, maybe sponsoring a gaming team that could use the empty innovation centers, according to one source. A plan to export dairy to China got as far as a meeting with the Wisconsin Department of Agriculture before collapsing. The department confirmed it met with Foxconn representatives about the plan in the spring of 2019 but said Foxconn paused “to conduct more research” and no additional discussions have taken place.

In May, Gou returned to Wisconsin. Meeting with Evers on his way back from another visit to the White House, the founder, now running for president of Taiwan, said Foxconn’s plans had “never changed” and that LCD production would begin in May 2020. Evers appeared to backtrack on his previous criticism, saying he didn’t doubt Foxconn’s word.

Some employees hoped that a visit from the president would give Foxconn the impetus it needed to finally figure out a business and begin manufacturing. But as the date approached, the event became more of a trade show. With the “Fab” empty, and certainly not making LCDs, the plan became to use the smaller multipurpose building for the event.

The layoffs began with the new year. Starting in January, when the promised LCD factory was originally scheduled to open, Foxconn instead began letting employees go in batches.

In many ways, the Foxconn debacle in Wisconsin is the physical manifestation of the alternate reality that has defined the Trump administration. Trump promised to bring back manufacturing, found a billionaire eager to play along, and now for three years the people of Wisconsin have been told to expect an LCD factory that plainly is not there. Into the gap between appearance and reality fell people’s jobs, homes, and livelihoods.

WEDC, as part of its audit of the company’s 2019 subsidy application, had Foxconn survey its employees about what they were working on. Not a single respondent mentioned LCDs because no one is working on LCDs, and they never were.

“The state has upheld our part of the contract,” said DOA’s Joel Brennan. “Unfortunately, Foxconn hasn’t been able to do that on their side.” Brennan and WEDC officials continue to say they’re open to revising the contract to reflect whatever it is that Foxconn is now doing. Employees say that the company is now making servers, and Foxconn has announced it is making ventilators, though no employees or state officials could say whether any have been produced. Yet, Foxconn has so far refused to amend the contract. The company continues to insist, against all evidence, that an LCD factory is on its way.

A state report on Foxconn’s Wisconsin factory depicts a project gone far off course. The report, issued this month by Wisconsin’s Division of Executive Budget and Finance and obtained through a records request, confirms that the company has not built the enormous Gen 10.5 LCD factory specified in its contract. It also says that the building the company claims is a smaller Gen 6 LCD factory shows no signs of manufacturing LCDs in the foreseeable future and “may be better suited for demonstration purposes.”

The report notes that Foxconn received a permit to use its so-called “Fab” for storage, which The Verge first reported this week. Furthermore, according to an industry expert consulted by the state, Foxconn has not ordered the equipment that would be needed to make LCDs. If the building were to be used as an LCD manufacturing facility, the expert notes it would be the smallest Gen 6 in the world and “would appear to be more of a showcase than a business viable for the long term.”

If any LCD-related manufacturing were to take place in the building, the analysis says, it would likely only be the final assembly of components produced elsewhere and imported to Wisconsin. Such a project would have a vastly smaller impact on local supply chains and employ nowhere near the 13,000 workers anticipated in Foxconn’s contract with the state.

Regarding the company’s failure to build LCDs and two years spent veering from idea to idea (co-working, fish farming, building giant glass spheres), the company said “Foxconn’s progress in Wisconsin has been achieved despite many growing pains that includes the need to explore new business opportunities, adjust to changes in global customer requirements, and a constantly evolving global technology industry.”

When you stop and think about what goes into displaying one of these amazing images, you might recognize most are protected by a glass cover. You might even be familiar with display types like LCD or OLED. Yet for many, the recognition stops there. You may see the image on the surface, but rarely think about what creates that image, how it achieves life-like, vibrant color, and the journey it makes to reach our eyes.

Though each layer of the glass stack is formed with the same fusion manufacturing process, the compositions of the glass are different – allowing for different properties and benefits. LCD and OLED displays, whether on mobile devices with glass cover and back or otherwise, utilize different super-thin layers of glass specific to their applications:

Everyday, we look at LCD display, TV, cell phone, monitor. It becomes a necessity in modern society. LCD panel is the most important part of an LCD display. It determines LCD screen"s performance, e.g. brightness, contrast, color and viewing angle. Therefore, picking the right type of LCD panel is critical to your application.

These names reflect the alignment of crystal molecules inside the LCD, and how they change when they are charged electrically. All liquid crystal displays change the alignment of liquid crystal molecules to work, but the manner in which they do so can drastically affect the image quality and response time. Each panel type has its advantages and disadvantages. The easiest way to choose between them is to decide which attributes are most important to your project. It mainly depends on what you use your LCD display for, and your budget.

TN is the most mature technology in LCD panel manufacturing. When there is no voltage difference between the two transparent electrodes, liquid crystal molecules are twisted 90 degrees, in combination of upper and bottom polarizers, allows light to pass through LCD. As voltage applied, crystal molecules are untwisted and aligned to the same direction, blocking light.

In IPS panel, crystal molecules are parallel to the glass substrates at initial stage, LCD is off. When the in-plane electrodes is charged, crystal molecules are rotated, modifying light"s direction. Which lights up the LCD display.

As its name suggests, VA panel"s liquid crystals are aligned vertically without charged. When a voltage is applied, the molecules tilt and modifying light direction.

So in summary, TN panels twist, IPS panels use a parallel alignment and rotate, while VA panels use a perpendicular