tft lcd led backlight quotation

The Durapixel 7" sunlight readable LCD Monitor from Litemax is powered by a strong array of LED backlights, achieving a brightness of 1000 NITS with a screen resolution of 1024x600. The display is perfectly suited to outdoor environments, or applications where there are high ambient light conditions such as kiosk, ATM, POS, mobile, military, marine or digital signage. By incorporating the latest LED backlight technology, it not only helps with the projected lifetime of the product (70,000 hours MTBF), but also helps keep power consumption levels down to a minimum, which in turn helps with heat generation. The display has a wide operating temperature of between -20°C~70°C which firms the screens adequacy for outdoor applications. This screen is available in various formats including chassis, panel mount and kit forms.

A wide variety of 7 inch tft led backlight lcd options are available to you, You can also choose from original manufacturer, odm 7 inch tft led backlight lcd,As well as from tft, ips, and tn.

There’s been a significant growth in the monitor market when it comes to screens with LED backlighting. I wanted to provide an article which explains the technology in more detail as it is bound to become more and more widespread. The technology was originally quite expensive, but reduced production costs and improved manufacturing processes have allowed LED backlighting to be used in even the lower cost monitor market. We are now seeing an influx of new screens in all different sizes using LED backlighting, and it is also being combined with TN Film, VA and IPS panel technologies.

RGB LED Backlighting – This type of backlighting is based on RGB triads, each including one red, one green and one blue LED. RGB LED backlighting ensures an excellent colour gamut and very pure colours, but is only really used in professional-grade displays such as the Samsung XL20, XL24, XL30 screens, and modern professional models like the HP DreamColor LP2480zx. This type of backlighting is only used in this sector due to its high cost and it is not economical to produce at the moment.

An edge backlight with white LEDs (W-LEDs) –The LEDs are placed in a line along the edge of the matrix, and the uniform brightness of the screen is ensured by a special design of the diffuser. This backlight does not offer the option of zonal control over brightness like the direct lit method does (see below). It can not offer an extended color gamut either. Instead, it is economical and compact, which makes it popular among notebook makers and with manufacturers producing ultra-thin displays and keen to keep costs to a minimum. This is the variation commonly being used in desktop displays at the moment.

A flat backlight based on white LEDs (W-LEDs) – As there is only one third of the total amount of LEDs here, this backlight is much cheaper than the triad-based backlight, but it cannot deliver an extended color gamut. In the backlight of this type LEDs are uniformly distributed in the plane parallel to the matrix, which allows setting the backlight intensity differently in different parts of the screen when necessary. This is the further development of the dynamic contrast technology. It is currently employed in LCD TV-sets only and is also referred to as ‘direct lit’ W-LED. A note about white LEDs – A white LED is actually a blue LED with yellow phosphor to give the impression of white light. The spectral curve has big gaps in the green and red parts.

If marketing is to be believed, LED backlighting offers you all kinds of advantages, but it’s important to understand what is true, and what is not. We will discuss different aspects and whether they are influenced by a different backlight source:

Colour Gamut– this is controlled in monitors by the properties of the colour filters of the LCD matrix, and by the backlight’s radiation spectrum. You will see CCFL backlighting offering colour gamuts covering between 72% (commonly referred to as “standard gamut” / sRGB) and 102% of the NTSC reference colour space. The CCFL backlighting above 72% are commonly referred to as wide gamut, or W-CCFL / WCG-CCFL. In LED backlighting, the RGB LED format can offer really large colour gamuts with pure and saturated colours. These can cover typically >114% of the NTSC colour space, and is one of the reasons they are often employed in high end professional screens. W-LED backlighting cannot offer these extended gamuts, and on paper actually cover slightly less of the NTSC colour space than standard gamut CCFL (typically 68%). The difference is hardly detectable by the naked eye however.

Colour Accuracy – aspects of colour reproduction do not depend on the type of backlight at all. They are determined by how accurately the monitor is set up in the factory, the characteristics of the panel technology and the internal electronics to a degree.

Static contrast ratio – LED backlighting models are advertised with massive contrast ratios, ranging commonly into the millions now! Figures of up to 20 million:1 are common at the time of writing. Be aware though that these are normally headline dynamic contrast ratio figures, with the normal static contrast ratio rarely even mentioned. It is important to understand that static contrast ratio is only determined by the characteristics of the LCD matrix itself and not by the backlighting type or nature. It is determined by the ratio of the transparency levels of open and closed pixels.

Dynamic contrast ratio – As opposed to gas-discharge lamps (CCFL), LEDs can be lit up instantly or turned out completely. This can lead to extremely high levels of dynamic contrast as we have mentioned above. Figures in the millions are very common now. But in real applications, for example when watching a movie, there are no absolutely black frames even in the credits. Most of the time there is something on the screen besides blackness and a monitor with a huge specified dynamic contrast will never have the chance to deliver it in practice. As a result, there is no real practical point in increasing the dynamic contrast higher than about 10,000:1 which has already become standard for many monitors, including those with a backlight based on CCFL lamps. Keep in mind that DCR figures are often exagerated as a result, and since you will probably never get to utlise the full figure in practice, don’t be fooled into buying into the hype too much!

Uniformity – Most desktop monitors use edge-lit W-LED backlighting with a line of LEDs along the edge of the panel. The whole screen is lit by means of a special diffuser, and so it is this which really determines the brightness uniformity you experience. The uniformity of brightness depends only on the design of the diffuser and you can often see various defects like bright spots or a brighter zone at the edge of the screen where the lamp or the line of LEDs resides. Having an LED backlight does not guarantee you better uniformity. In fact, good uniformity is harder to achieve in the long term as the LEDs age, with each LED possibly aging at a different rate. With RGB LED units, the use of three separate light sources for red, green, and blue means that the white point / colour temperature of the display can move as the LEDs age at different rates as well.

Instantly On – some manufacturers mention that an LED can be instantly turned on, meaning there is no warm up time like there is with a CCFL backlight. This is true, but it’s debatable how important this really is to an end user.

Size – LED backlighting units can be very thin, allowing manufacturers to produce ultra-thin displays with sleek and attractive designs. You also see this technology used in laptops and LCD TV’s for the same purposes. This technology has allowed production of thinner screens which are in high demand by consumers. Manufacturers are actively working on reducing the size of the LEDs to be used in these modules to improve things even more. Screens using a flat W-LED or RGB backlight behind the panel cannot offer the same thin profile however.

Environmental – LEDs do not contain mercury, unlike CCFL’s and so can be recycled more easily. You will see mention of various certificates and compliance standards as well, such as ‘RoHS compliance’. These can show the displays have met recylcing standards. Certainly a benefit of LED backlighting for the environmentally concious.

Power Consumption– This is perhaps one of the key advantages of LED backlighting in modern times. The technology uses less energy and so you can save money and energy and reduce your carbon footprint at the same time. For example, the non-LED version of the 24″ BenQ G2420HBD consumer display has a 49W consumption compared to the 24W of the LED version of the same display (G2420HBDL). The BenQ LED monitors are typically marketed as offering a reduced power consumption of 36% in comparison to traditional monitors. Other manufacturers quote similar figures, with 35 – 40% energy saving being common. You will also see various ratings and ‘certificates’ applied to these screens such as Energy Star and the likes.

At the professional end of the market where RGB LED backlighting is used, it is combined with high end panel technologies such as AMVA (from AU Optronics) or IPS (from LG.Display). These panel technologies are more expensive to produce than the widely used TN Film panels in the mainstream market. When you are using an expensive backlighting unit, it obviously should be paired with a higher-end panel though. In fact, modern RGB LED displays such as the HP DreamColor LP2480zx even use a one-of-a-kind true 10-bit H-IPS panel (not 8-bit +AFRC like some of the other modern “10-bit” screens). RGB LED models are few and far between though of course.

W-LED backlit models are becoming more and more mainstrea. Initially the technology was combined exclusively with TN Film panels, since low production costs (and low retail costs) were the name of the game. There are many TN Film based models out there with LED backlighting now. More recently, in the later half of 2010, we have seen models emerge combining W-LED backlighting with VA and IPS matrices. AU Optronics have released modules in several sizes which combine their AMVA panel technology with LED, and LG.Display have begun to release a combination of IPS and LED. The BenQ EW2420 and VW2420H were two of the first VA based screens on the market with LED. The NEC EA232WMi and forthcoming models from LG will be some of the first to use IPS + LED. We expect this trend will continue.

LED backlighting is the most commonly used backlight for small, LCD panels. Light-emitting diodes, or LEDs, are practical components for a light source because of their small size. LED backlighting is popular due to its overall low cost, long life, variety of colors and high brightness.

LED backlights are housed in a light box that has a diffuser to evenly distribute the LED light. The light box is then mounted behind the LCD’s viewing area. The LED backlight comes in two configurations: array and edge lit. The array configuration has the LEDs mounted in a uniform, grid layout within the light box. This configuration gives off a very bright, even light. The disadvantage of an array configuration is that it requires a thick light box design to accommodate the number of LEDs required. The high number of LEDs in this configuration also means it consumes more power.

The other configuration for LED backlights is edge lit. An edge lit configuration is the most commonly used construction for LED backlights. This configuration mounts the LEDs along one edge of the light box. The layout results in a thin design. Edge lit also uses less LEDs overall and therefore consumes less power than an array configuration.

Another type of backlight options is the use of fiber optic technology. Fiber optic backlights use sheets of fiber optic woven cloth and are bundled by a ferrule (metal cap) to an LED or halogen light source. Advantages for the fiber optic technology includes low voltage, low power, and a very uniform brightness. This type of backlighting is ideal for custom display shapes or sizes however it is priced at a higher cost compared to other technologies available.

A third type of backlight option available uses an electroluminescent (EL) panel. The EL backlight is constructed of a series of different material layers that work together to create the light. The EL panel generates light when an electric current (AC power) is applied to its conductive surfaces. The advantage with EL backlighting is its low power consumption, no heat emission, and overall thin composition. EL backlighting is limiting in that it requires an invertor to generate the VAC needed to emit the light.

The last common backlight option available are cold cathode fluorescent lamps (CCFLs). CCFL backlights are a cost effective option typically found in graphic displays. The CCFL backlight for LCDs is usually configured with the lamp on the edge of a diffuser to distribute the light. An inverter is required to supply the voltage required by the fluorescent lamp. CCFLs offer a bright white light with low power consumption. This backlight option is not ideal for cold-temperature applications (less than 15°C) as the light output decreases with decreased ambient temperature.

There are many different backlight options available for your LCD. The most common types are LED, fiber optic, EL, and CCFL backlights. Cost and application of your product will have the highest influences on which backlight technology is best for your LCD.

The IPPC-6000A Series is an Industrial Panel PC with front USB access, supports the powerful Haswell platform Core™ i7/i5/i3, high speed DDR3 memory, up to 32 GB, two expansion PCI slots. The processor and chipset combination form the foundation of vPro, Intel’s next generation digital office platform, offering remote out-of-band manageability, improved security, and energy efficient performance. Two SATA hard driver interface with RAID 0,1 support provides data security. Multi function optional –CFast ,PCI/ PCIe expansion,DVDROM which offers great flexibility for application specific requirements.Rugged Metal &IP65 Flat-Sealed Front provide excellent durability in harsh environment. With optional mounting accessories, from panels to racks,it can be mounted anywhere.

The Kit includes an LCD display with LED backlighting that replaces the original LCD display with CCFL (Cold Cathode Fluorescent Lamp) backlighting. This kit is also used as a service replacement for HPDU displays that already include the LCD display with LED backlighting. The display unit is used in anesthesia machines. The kit is comprised of the following accessory items; LCD display (12-inch color, LED backlight), LED backlight driver board, cable harness (CPU board to LED backlight driver board), cable harness (driver board to LED backlight), short foam pad (for Engstrom Touchscreen) and long foam pad (for Engstrom Touchscreen). This kit is used in many systems such as ARC Aespire 7900, MS CARESCAPE™ Monitor B650, ARC Aespire View, ARC Engstrom Carestation, ARC Aisys, ARC Light Monitor and ARC Avance Carestation, among others.

An LED-backlit LCD is a liquid-crystal display that uses LEDs for backlighting instead of traditional cold cathode fluorescent (CCFL) backlighting.TFT LCD (thin-film-transistor liquid-crystal display) technologies as CCFL-backlit LCDs, but offer a variety of advantages over them.

While not an LED display, a television using such a combination of an LED backlight with an LCD panel is advertised as an LED TV by some manufacturers and suppliers.

The local dimming method of backlighting allows to dynamically control the level of light intensity of specific areas of darkness on the screen, resulting in much higher dynamic-contrast ratios, though at the cost of less detail in small, bright objects on a dark background, such as star fields or shadow details.

A 2016 study by the University of California (Berkeley) suggests that the subjectively perceived visual enhancement with common contrast source material levels off at about 60 LCD local dimming zones.

LED-backlit LCDs are not self-illuminating (unlike pure-LED systems). There are several methods of backlighting an LCD panel using LEDs, including the use of either white or RGB (Red, Green, and Blue) LED arrays behind the panel and edge-LED lighting (which uses white LEDs around the inside frame of the TV and a light-diffusion panel to spread the light evenly behind the LCD panel). Variations in LED backlighting offer different benefits. The first commercial full-array LED-backlit LCD TV was the Sony Qualia 005 (introduced in 2004), which used RGB LED arrays to produce a color gamut about twice that of a conventional CCFL LCD television. This was possible because red, green and blue LEDs have sharp spectral peaks which (combined with the LCD panel filters) result in significantly less bleed-through to adjacent color channels. Unwanted bleed-through channels do not "whiten" the desired color as much, resulting in a larger gamut. RGB LED technology continues to be used on Sony BRAVIA LCD models. LED backlighting using white LEDs produces a broader spectrum source feeding the individual LCD panel filters (similar to CCFL sources), resulting in a more limited display gamut than RGB LEDs at lower cost.

The evolution of energy standards and the increasing public expectations regarding power consumption made it necessary for backlight systems to manage their power. As for other consumer electronics products (e.g., fridges or light bulbs), energy consumption categories are enforced for television sets.

Using PWM (pulse-width modulation), a technology where the intensity of the LEDs are kept constant but the brightness adjustment is achieved by varying a time interval of flashing these constant light intensity light sources,

A first dynamic "local dimming" LED backlight was public demonstrated by BrightSide Technologies in 2003,Sony in September 2008 on the 40-inch (1,000 mm) BRAVIA KLV-40ZX1M (known as the ZX1 in Europe). Edge-LED lighting for LCDs allows thinner housing; the Sony BRAVIA KLV-40ZX1M is 1 cm thick, and others are also extremely thin.

LED-backlit LCDs have longer life and better energy efficiency than plasma and CCFL LCD TVs.mercury, an environmental pollutant, in their manufacture. However, other elements (such as gallium and arsenic) are used in the manufacture of the LED emitters; there is debate over whether they are a better long-term solution to the problem of screen disposal.

Because LEDs can be switched on and off more quickly than CCFLs and can offer a higher light output, it is theoretically possible to offer very high contrast ratios. They can produce deep blacks (LEDs off) and high brightness (LEDs on). However, measurements made from pure-black and pure-white outputs are complicated by edge-LED lighting not allowing these outputs to be reproduced simultaneously on screen.

Quantum dots are photoluminescent; they are useful in displays because they emit light in specific, narrow normal distributions of wavelengths. To generate white light best suited as an LCD backlight, parts of the light of a blue-emitting LED are transformed by quantum dots into small-bandwidth green and red light such that the combined white light allows a nearly ideal color gamut to be generated by the RGB color filters of the LCD panel. In addition, efficiency is improved, as intermediate colors are no longer present and do not have to be filtered out by the color filters of the LCD screen. This can result in a display that more accurately renders colors in the visible spectrum. Companies developing quantum dot solutions for displays include Nanosys, 3M as a licensee of Nanosys, QD Vision of Lexington, Massachusetts, US and Avantama of Switzerland.Consumer Electronics Show 2015.quantum dot displays at CES 2017 and later formed the "QLED Alliance" with Hisense and TCL to market the technology.

Mini LED displays are LED-backlit LCDs with mini-LED–based backlighting supporting over a thousand full array local dimming (FALD) zones, providing deeper blacks and a higher contrast ratio.

LED backlights are often dimmed by applying pulse-width modulation to the supply current, switching the backlight off and on more quickly than the eye can perceive. If the dimming-pulse frequency is too low or the user is sensitive to flicker, this may cause discomfort and eyestrain similar to the flicker of CRT displays at lower refresh rates.

Novitsky, Tom; Abbott, Bill (12 November 2007). "Driving LEDs versus CCFLs for LCD backlighting". EE Times. Archived from the original on 28 November 2010. Retrieved 21 November 2020.

LED TVs: 10 things you need to know; David Carnoy, David Katzmaier; CNET.com/news; 3 June 2010; https://www.cnet.com/news/led-tvs-10-things-you-need-to-know/

Controlling Power Consumption for Displays With Backlight Dimming; Claire Mantel et al; Journal of Display Technology; Volume: 9, Issue: 12, Dec. 2013; https://ieeexplore.ieee.org/document/6520956

LCD Television Power Draw Trends from 2003 to 2015; B. Urban and K. Roth; Fraunhofer USA Center for Sustainable Energy Systems; Final Report to the Consumer Technology Association; May 2017; http://www.cta.tech/cta/media/policyImages/policyPDFs/Fraunhofer-LCD-TV-Power-Draw-Trends-FINAL.pdf Archived 1 August 2017 at the Wayback Machine

The HMI small touchscreen features 5.7inch backlight LED color TFT LCD display, supports 320 x 240 pixels QVGA resolution. This touch panel screen has 65536 colors with 50,000 hours of backlight lifespan. It supports Korean, Chinese (simplified Chinese), Japanese (ANK, Kanji), ASCII and Taiwanese (traditional Chinese) character fonts. The analogue touch panel with 16 levels brightness provides four viewing angles 60° left, 60° right, 40° top, 60° bottom in horizontal x vertical. Its dimensions are 163mm (width) x 129.4mm (depth). It weighs 0.405kg. It is suitable for use with small machines, HVAC, pumping and packaging applications. The integrated design of Harmony SCU delivers maximum functionality while keeping installation easy. The Harmony SCU (formerly known as Magelis SCU) is designed to operate with the EcoStruxure Machine Expert, delivers adequate functionality for control of small machines.