high contrast lcd display made in china

It iscommonlyknown that the LCD itself can generate noise in 3D barrier applications. This noise disturbs consumers. Many LCD makers solve this problem with an expensive technology during TFT-LCD manufacturing. Unicorn has invented and patented a special technology toeliminatesuch noise.This technology canbe carriedout during normal passive LCD manufacturing processes, thus offering a competitive cost to the customers.

Also, 3D barriersrequirea good photolithography process to make thousands of fine lines in the LCD.Unicorn’s 3D barrier technology can support up to 15.6″ AA size with 4104 fine lines for 3D notebook application.

Unicorn has installed an advanced and automated Japanese-made optical bonding machine, which has been used widely in world-class tablet and smart phone assembly. This liquid-type optical bonding machine can be used to perform all kinds of lamination between front cover, capacitive touch panel and displays for size up to 13″ and on non-flat surface.

Employees put finishing touches to TV displays at a production facility in Suining, Sichuan province, in November. [Photo by Liu Changsong/For China Daily]

China is set to take a lead in the state-of-the-art organic light-emitting diodes (OLED) semiconductor display technology, which has broad application prospects in the field of high-end smartphones, televisions, wearable devices, augmented reality and virtual reality display segments, industry analysts said.

OLED is a relatively new technology and part of the recent innovations in displays. It has a fast response rate, wide viewing angles, super high-contrast images and richer colors. It is thinner and can be made flexible and foldable, compared with the traditional LCD display panel.

Display panel supplier BOE Technology Group Co Ltd topped the domestic market with OLED panel shipments of 16 million units in the third quarter. It became the world"s second-largest OLED maker next to South Korea"s Samsung Display. Visionox Technology Inc took second place domestically with shipments of 6.3 million units in the third quarter.

China will overtake South Korea to become the biggest OLED manufacturer by 2024, as more Chinese companies have invested heavily in new OLED production lines, said Zhou Hua, chief analyst at CINNO Research, a Chinese flat panel display consultancy firm.

Zhou said that at present, China has become the world"s largest display panel producer, and is foreseen accounting for about 76 percent of global OLED production capacity by 2025.

Chinese smartphone makers have increased the number of high-end smartphones integrating flexible active-matrix organic light-emitting diodes, or AMOLED, panels, said Brian Huh, principal analyst of small and medium-sized displays at Omdia.

Xu Fengying, vice-president of Visionox, said AMOLED panels will have wider applications in smartphones, computers, smart wearables, vehicles, virtual reality and augmented reality because of surging demand for flexible display screens.

"The AMOLED market will continue to grow, and the penetration rate of flexible display products is expected to rise," said Zhu Xiujian, general manager of Visionox"s product engineering center, adding the flexible and foldable screens will play a vital role in bolstering the growth of small and medium-sized smartphones.

Chinese television maker Skyworth Group has been producing OLED TVs in partnership with South Korea"s largest panel maker, LG Display, since 2013. Other home appliance manufacturers such as Hisense, Konka, Huawei and Sony have also tapped into the OLED TV market.

The general quality of Chinese CCTV monitors gets much improved. Three major Chinese monitor manufacturers are Skyworth, Stonesonic and Satow. The industry started export quite earlier compared to other security vendors in China. Now, LCD monitors, monitors for surveillance in commercial setting and LCD multiple screen combination panel wall are their main products.

The general quality of Chinese CCTV monitors gets much improved. Three major Chinese monitor manufacturers are Skyworth, Stonesonic and Satow. The industry started export quite earlier compared to other security vendors in China. Now, LCD monitors, monitors for surveillance in commercial setting and LCD multiple screen combination panel wall are their main products.

According to some industry expert, the ratio of global LCD to CRT production is roughly about 6:4. LCD monitors, in the past, had some defeats in certain aspects, such as brightness, contrast, visual angle, response time, lifespan and production. Along with the technical improvement, current LCD monitors are better performed in color, brightness, contrast, nearly 180-degree visual angle and response time. Plus, it has advantages in thin design, environmental friendly, and energy-saved (because of lead in the components of CRT monitors). LCD monitors have gradually replaced the CRT.

Many users might confuse LCD monitors with LCD display or LCD TV. However, the basic requirements for LCD monitors are quite different from them. For one LCD monitor, it is usually required to have higher standards on visual angle, brightness and contrast, color display ability, response time, resolution and the stability to operate continuously 24/7. Therefore, the safe electric performance and good heat emission design should be taken into the consideration for the design of one LCD monitor.

For one LCD monitor, a much broader visual angle and higher brightness and contrast are required for watching the fixed video picture at long distances. For PC display, the ideal pictures can be showed if it meets the required brightness and contrast of 200 cd/m2 and 300:1 respectively. But for monitors, the brightness and contrast should be not less than 300 cd/m2 and 450:1. The quality of picture is not only related to the brightness and contrast but also the definition, color reducibility, and SNR (signal to noise ratio) specifications. In addition, the response time is also quite important for LCD monitors. Manufacturers recently have taken a lot of efforts on increasing the response speed from the early 60 ms, 30 ms and 25 ms to current 16 ms, 12 ms and 8 ms; the tailing phenomenon has been almost disappeared and has little difference with response time for CRT.

One of Satow"s latest launch--42" Color LCD monitor, ML-4200TM1. It features 3-dimension image processing to reduce the noise and avoid the interference from the bright, making the picture display more sophisticated with PAL/NTSC. Its unique DNX technology makes the image more stable while displaying the moving pictures and video. The resolution is about 1920 x 1080; brightness is 500 cd/m2 and the contrast ratio is 2000:1. The response time can be 6.5 ms. Power supply is AC 100-240V.

Many LCD display"s power is often DC 12 V, using the external AC power adapter 220V AC/12V DC; however, it could not meet the requirements of electromagnetism interference (EMI) and electromagnetism compatible electron agnetic compatibility (E-MC) for professional monitors working at factories. Take Stonesonic. It adopted the reliable built-in switch power instead that can meet the requirements of electromagnetism compatible and interference standard. So it ensures the constant working of the machine no matter under what kind of environments and its much more coordinated appear once design is also more convenient for project mounting and operation. Skyworth also highlights its internal power supply with low consumption, and its screen service expectancy exceeds 60,000 hours. The latest I2C controlling circuits, the high reliability of whole system.

The luminescence of LCD panel is realized through several lamp tubes (cathode vacuum tube). Because some of the tubers are fixed at the fringe of the panel, it is normal that the frame becomes heated when being used for a certain period. In the design of LCD monitors, Stonesonic applied the hydrodynamics theory to make the air whirlpool inside the space of the machine form the convection, and operate the heat emission through those metal parts inside at the same time, which all ensure the reliable and constant working of the machine. So it will not affect the lifespan of the monitor if the frame of the LCD feels a little heated by hand.

Stonesonic recently launched one 19"color LCD monitor built-in DVR--SCM-1980MR. It is one kind of 8-channel monitoring and recording all-in-one monitor, adopting top-quality 19" TFT LCD panel and has functions of 4-8 channels composite video simultaneous input, real-time monitoring and recording, network remote monitoring, recording backup and alarm pan/tilt controlling.

Satow Eletronic also has one 17" LCD with built-in 4-channel MPEG-4 DVR system-BL-1700T4/CP-5714CB. Adopting the latest DSP hardware compression for each channel, the resolution is quite high. It can remote monitor via network, viewing with IE Browser or client-end software. For the LCD monitor, its contrast ratio is 800:1, brightness ratio of 300 cd/m2, display color in 16.2 M.

Stonesonic and Skywor th also developed their latest products of LCD combination panel wall. For Stonesonic, its LCD combination panel wall has already been registered and approved for six patents. The hardware basic is FPG A array, using parallel high speed image processing technology. It implements multiple high speed video signal"s unify processing technology. It totally replaces the insert card combination controller and solves the problem of quantity limitation of VGA input. It possesses all the excellent DID display technology, embedded hardware combination technology, multiple image processing technology, signal switching technology. This advanced LCD combination panel wall display system has benefits of high brightness and high definition, low power consumption and long lifespan.

Stonesonic monitor is used in many different applications such as security, broadcast, industry and multi-media. Their application in security accounts for 60 to 70 percent. Its strengths are high definition in image quality; more natural color in display. Its LCD export accounts for 50 percent of their total market. Till now, Stonesonic has had sales points in over 80 countries. It targets more at European and US markets. The latest products also includes one big IP screen monitor; very easy to install within one single IP cable. It also differentiated others in self-developed chipsets for monitors. Other vendors might adopt AV chips for LCD monitor so the 3D image may be worse in quality.

A thin-film-transistor liquid-crystal display (TFT LCD) is a variant of a liquid-crystal display that uses thin-film-transistor technologyactive matrix LCD, in contrast to passive matrix LCDs or simple, direct-driven (i.e. with segments directly connected to electronics outside the LCD) LCDs with a few segments.

In February 1957, John Wallmark of RCA filed a patent for a thin film MOSFET. Paul K. Weimer, also of RCA implemented Wallmark"s ideas and developed the thin-film transistor (TFT) in 1962, a type of MOSFET distinct from the standard bulk MOSFET. It was made with thin films of cadmium selenide and cadmium sulfide. The idea of a TFT-based liquid-crystal display (LCD) was conceived by Bernard Lechner of RCA Laboratories in 1968. In 1971, Lechner, F. J. Marlowe, E. O. Nester and J. Tults demonstrated a 2-by-18 matrix display driven by a hybrid circuit using the dynamic scattering mode of LCDs.T. Peter Brody, J. A. Asars and G. D. Dixon at Westinghouse Research Laboratories developed a CdSe (cadmium selenide) TFT, which they used to demonstrate the first CdSe thin-film-transistor liquid-crystal display (TFT LCD).active-matrix liquid-crystal display (AM LCD) using CdSe TFTs in 1974, and then Brody coined the term "active matrix" in 1975.high-resolution and high-quality electronic visual display devices use TFT-based active matrix displays.

The liquid crystal displays used in calculators and other devices with similarly simple displays have direct-driven image elements, and therefore a voltage can be easily applied across just one segment of these types of displays without interfering with the other segments. This would be impractical for a large display, because it would have a large number of (color) picture elements (pixels), and thus it would require millions of connections, both top and bottom for each one of the three colors (red, green and blue) of every pixel. To avoid this issue, the pixels are addressed in rows and columns, reducing the connection count from millions down to thousands. The column and row wires attach to transistor switches, one for each pixel. The one-way current passing characteristic of the transistor prevents the charge that is being applied to each pixel from being drained between refreshes to a display"s image. Each pixel is a small capacitor with a layer of insulating liquid crystal sandwiched between transparent conductive ITO layers.

The circuit layout process of a TFT-LCD is very similar to that of semiconductor products. However, rather than fabricating the transistors from silicon, that is formed into a crystalline silicon wafer, they are made from a thin film of amorphous silicon that is deposited on a glass panel. The silicon layer for TFT-LCDs is typically deposited using the PECVD process.

Polycrystalline silicon is sometimes used in displays requiring higher TFT performance. Examples include small high-resolution displays such as those found in projectors or viewfinders. Amorphous silicon-based TFTs are by far the most common, due to their lower production cost, whereas polycrystalline silicon TFTs are more costly and much more difficult to produce.

The twisted nematic display is one of the oldest and frequently cheapest kind of LCD display technologies available. TN displays benefit from fast pixel response times and less smearing than other LCD display technology, but suffer from poor color reproduction and limited viewing angles, especially in the vertical direction. Colors will shift, potentially to the point of completely inverting, when viewed at an angle that is not perpendicular to the display. Modern, high end consumer products have developed methods to overcome the technology"s shortcomings, such as RTC (Response Time Compensation / Overdrive) technologies. Modern TN displays can look significantly better than older TN displays from decades earlier, but overall TN has inferior viewing angles and poor color in comparison to other technology.

Most TN panels can represent colors using only six bits per RGB channel, or 18 bit in total, and are unable to display the 16.7 million color shades (24-bit truecolor) that are available using 24-bit color. Instead, these panels display interpolated 24-bit color using a dithering method that combines adjacent pixels to simulate the desired shade. They can also use a form of temporal dithering called Frame Rate Control (FRC), which cycles between different shades with each new frame to simulate an intermediate shade. Such 18 bit panels with dithering are sometimes advertised as having "16.2 million colors". These color simulation methods are noticeable to many people and highly bothersome to some.gamut (often referred to as a percentage of the NTSC 1953 color gamut) are also due to backlighting technology. It is not uncommon for older displays to range from 10% to 26% of the NTSC color gamut, whereas other kind of displays, utilizing more complicated CCFL or LED phosphor formulations or RGB LED backlights, may extend past 100% of the NTSC color gamut, a difference quite perceivable by the human eye.

The transmittance of a pixel of an LCD panel typically does not change linearly with the applied voltage,sRGB standard for computer monitors requires a specific nonlinear dependence of the amount of emitted light as a function of the RGB value.

Initial iterations of IPS technology were characterised by slow response time and a low contrast ratio but later revisions have made marked improvements to these shortcomings. Because of its wide viewing angle and accurate color reproduction (with almost no off-angle color shift), IPS is widely employed in high-end monitors aimed at professional graphic artists, although with the recent fall in price it has been seen in the mainstream market as well. IPS technology was sold to Panasonic by Hitachi.

Most panels also support true 8-bit per channel color. These improvements came at the cost of a higher response time, initially about 50 ms. IPS panels were also extremely expensive.

In 2004, Hydis Technologies Co., Ltd licensed its AFFS patent to Japan"s Hitachi Displays. Hitachi is using AFFS to manufacture high end panels in their product line. In 2006, Hydis also licensed its AFFS to Sanyo Epson Imaging Devices Corporation.

It achieved pixel response which was fast for its time, wide viewing angles, and high contrast at the cost of brightness and color reproduction.Response Time Compensation) technologies.

Less expensive PVA panels often use dithering and FRC, whereas super-PVA (S-PVA) panels all use at least 8 bits per color component and do not use color simulation methods.BRAVIA LCD TVs offer 10-bit and xvYCC color support, for example, the Bravia X4500 series. S-PVA also offers fast response times using modern RTC technologies.

A technology developed by Samsung is Super PLS, which bears similarities to IPS panels, has wider viewing angles, better image quality, increased brightness, and lower production costs. PLS technology debuted in the PC display market with the release of the Samsung S27A850 and S24A850 monitors in September 2011.

TFT dual-transistor pixel or cell technology is a reflective-display technology for use in very-low-power-consumption applications such as electronic shelf labels (ESL), digital watches, or metering. DTP involves adding a secondary transistor gate in the single TFT cell to maintain the display of a pixel during a period of 1s without loss of image or without degrading the TFT transistors over time. By slowing the refresh rate of the standard frequency from 60 Hz to 1 Hz, DTP claims to increase the power efficiency by multiple orders of magnitude.

Due to the very high cost of building TFT factories, there are few major OEM panel vendors for large display panels. The glass panel suppliers are as follows:

External consumer display devices like a TFT LCD feature one or more analog VGA, DVI, HDMI, or DisplayPort interface, with many featuring a selection of these interfaces. Inside external display devices there is a controller board that will convert the video signal using color mapping and image scaling usually employing the discrete cosine transform (DCT) in order to convert any video source like CVBS, VGA, DVI, HDMI, etc. into digital RGB at the native resolution of the display panel. In a laptop the graphics chip will directly produce a signal suitable for connection to the built-in TFT display. A control mechanism for the backlight is usually included on the same controller board.

The low level interface of STN, DSTN, or TFT display panels use either single ended TTL 5 V signal for older displays or TTL 3.3 V for slightly newer displays that transmits the pixel clock, horizontal sync, vertical sync, digital red, digital green, digital blue in parallel. Some models (for example the AT070TN92) also feature input/display enable, horizontal scan direction and vertical scan direction signals.

New and large (>15") TFT displays often use LVDS signaling that transmits the same contents as the parallel interface (Hsync, Vsync, RGB) but will put control and RGB bits into a number of serial transmission lines synchronized to a clock whose rate is equal to the pixel rate. LVDS transmits seven bits per clock per data line, with six bits being data and one bit used to signal if the other six bits need to be inverted in order to maintain DC balance. Low-cost TFT displays often have three data lines and therefore only directly support 18 bits per pixel. Upscale displays have four or five data lines to support 24 bits per pixel (truecolor) or 30 bits per pixel respectively. Panel manufacturers are slowly replacing LVDS with Internal DisplayPort and Embedded DisplayPort, which allow sixfold reduction of the number of differential pairs.

Backlight intensity is usually controlled by varying a few volts DC, or generating a PWM signal, or adjusting a potentiometer or simply fixed. This in turn controls a high-voltage (1.3 kV) DC-AC inverter or a matrix of LEDs. The method to control the intensity of LED is to pulse them with PWM which can be source of harmonic flicker.

The bare display panel will only accept a digital video signal at the resolution determined by the panel pixel matrix designed at manufacture. Some screen panels will ignore the LSB bits of the color information to present a consistent interface (8 bit -> 6 bit/color x3).

With analogue signals like VGA, the display controller also needs to perform a high speed analog to digital conversion. With digital input signals like DVI or HDMI some simple reordering of the bits is needed before feeding it to the rescaler if the input resolution doesn"t match the display panel resolution.

Kawamoto, H. (2012). "The Inventors of TFT Active-Matrix LCD Receive the 2011 IEEE Nishizawa Medal". Journal of Display Technology. 8 (1): 3–4. Bibcode:2012JDisT...8....3K. doi:10.1109/JDT.2011.2177740. ISSN 1551-319X.

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K. H. Lee; H. Y. Kim; K. H. Park; S. J. Jang; I. C. Park & J. Y. Lee (June 2006). "A Novel Outdoor Readability of Portable TFT-LCD with AFFS Technology". SID Symposium Digest of Technical Papers. AIP. 37 (1): 1079–82. doi:10.1889/1.2433159. S2CID 129569963.

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• Perform highly diversified duties to install and maintain electrical apparatus on production machines and any other facility equipment (Screen Print, Punch Press, Steel Rule Die, Automated Machines, Turret, Laser Cutting Machines, etc.).

Liquid Crystal Display (LCD) screens are a staple in the digital display marketplace and are used in display applications across every industry. With every display application presenting a unique set of requirements, the selection of specialized LCDs has grown to meet these demands.

LCD screens can be grouped into three categories: TN (twisted nematic), IPS (in-plane switching), and VA (Vertical Alignment). Each of these screen types has its own unique qualities, almost all of them having to do with how images appear across the various screen types.

This technology consists of nematic liquid crystal sandwiched between two plates of glass. When power is applied to the electrodes, the liquid crystals twist 90°. TN (Twisted Nematic) LCDs are the most common LCD screen type. They offer full-color images, and moderate viewing angles.

TN LCDs maintain a dedicated user base despite other screen types growing in popularity due to some unique key features that TN display offer. For one,

VA, also known as Multi-Domain Vertical Alignment (MVA) dislays offer features found in both TN and IPS screens. The Pixels in VA displays align vertically to the glass substrate when voltage is applied, allowing light to pass through.

Displays with VA screens deliver wide viewing angles, high contrast, and good color reproduction. They maintain high response rates similar to TN TFTs but may not reach the same sunlight readable brightness levels as comparable TN or IPS LCDs. VA displays are generally best for applications that need to be viewed from multiple angles, like digital signage in a commercial setting.

IPS (In-Plane Switching) technology improves image quality by acting on the liquid crystal inside the display screen. When voltage is applied, the crystals rotate parallel (or “in-plane”) rather than upright to allow light to pass through. This behavior results in several significant improvements to the image quality of these screens.

IPS is superior in contrast, brightness, viewing angles, and color representation compared to TN screens. Images on screen retain their quality without becoming washed out or distorted, no matter what angle they’re viewed from. Because of this, viewers have the flexibility to view content on the screen from almost anywhere rather than having to look at the display from a front-center position.

IPS displays offer a slightly lower refresh rate than TN displays. Remember that the time for pixels to go from inactive to active is measured in milliseconds. So for most users, the difference in refresh rates will go unnoticed.

Based on current trends, IPS and TN screen types will be expected to remain the dominant formats for some time. As human interface display technology advances and new product designs are developed, customers will likely choose IPS LCDs to replace the similarly priced TN LCDs for their new projects.

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SEOUL (Reuters) - Chinese flat screen makers, once dismissed as second-class players in the global LCD market, are drawing envious looks from big names such as LG Display Co Ltd and Samsung.An employee works inside a LCD factory in Wuhan, Hubei province, May 8, 2013. REUTERS/China Daily

While the Korean giants were busy developing next-generation organic light emitting diode (OLED) TVs, little-known Chinese companies have started selling a type of display that are sharper than the standard LCD and cheaper than OLED.

Until last year, the UHD market had been almost non-existent, with just 33,000 sets sold in the 200 million-unit LCD TV market. Since then, shipments have soared around 20-fold, thanks to China, data from research firm IHS shows.

Chinese consumers who want brighter and sharper images but can’t afford OLED screens made by LG and Samsung Display, a unit of Samsung Electronics Co Ltd, are turning to UHD.

But its slow introduction into the market and austere prices have thrown open a window of opportunity for UHD makers, in this case Chinese companies like BOE Technology Group Co Ltd and TCL Corp’s LCD unit CSOT.

“We assumed it’ll be too early for this type of display to take off, and thus didn’t think much of having diverse UHD product line-ups, especially in the low end. But I think we are not late just yet and we are working hard to lead the market here.”

By comparison, Japanese flat-screen pioneer Sharp Corp reported a razor-thin 0.5 percent margin. LG Display, the world’s No.1 LCD maker, posted a 5.6 percent margin.

Samsung Display, a unit of Samsung Electronics, had a margin of 13 percent, the biggest in the industry. But excluding its fledging OLED business, its LCD margin is between 3 and 7 percent, according to a Bernstein forecast.

Jolted by the reality of a growing UHD market, Samsung Electronics unveiled a 110-inch UHD TV in January. Interestingly, the UHD displays were not made by Samsung Display, but were produced by Taiwan’s AU Optronics.

“Even with some expansion of the Chinese panel suppliers we do expect Samsung and LG Display to stay dominant and continue production in LCD,” said Sweta Dash, director at IHS.

While Samsung and LG Display are investing billions of dollars in OLED this year, the two giants are also broadening their product lineups to include more popular 50 to 60-inch UHD models.

BOE Technology is now planning to raise 46 billion yuan ($7.5 billion) in the biggest Chinese equity offering this year, to build panel production lines and increase its stake in its LCD venture BOE Display Technology.

Choosing from material options such as soda lime, chemical and heat strengthened, tempered and toughened glass and PMMA, Polycarbonate and Optolite™ high scratch resistant plastics, our team can pinpoint the ideal solution. Our bespoke service also includes enhancement such as Anti-Glare (AG), Anti-Reflection (AR) and Anti-Smudge (AS) optical treatments. Finally, colour and graphic logo printing, circular, rectangular and free-form cut-out detailing can fully customise your monitors.

Specially designed embedded SBC solutions for our AMOLED displays, contain all the essential hardware, software, electronics and interface drivers to reduce your development cycle and speed up time to market.

The growth in flat panel display (FPD) production capacity in China has been quite astounding over the past decade. Back in 2009 there was very little FPD capacity in China; Korea, Taiwan and Japan made nearly all of the world’s displays, with nearly half coming from Korea. This year, China’s capacity has risen to more than 153 million square meters according to IHS, representing just under half of the worldwide capacity for display production.

Such a rapid growth in capacity has not happened by accident – it has been a concerted effort by the Chinese government, who identified display manufacturing as a key industry for both revenue growth and job creation, and to serve a rapidly growing internal market. As a result there have been significant subsidies available at a national, provincial and local city levels to cover capital equipment (often up to 50%), as well as other subsidies and tax breaks. Competition between different provinces and cities has resulted in clusters of fabs across China. Today over half of China’s provinces contain major display factories.

The capacity in China will continue to grow in the coming few years. The most recent wave of fabs are so-called Gen 10.5 factories – the biggest display factories ever built. These use huge sheets of glass (2.9m x 3.4m) which are processed in one sheet until they are cut down to TV-sized pieces at the end of the process. The input glass sheet size is so large that it cannot be shipped to the factory, so a dedicated glass foundry must be built immediately adjacent to the display factory. A single Gen 10.5 display fab can output more than 10 million square meters of display per year from a facility costing around $6-$7Bn to build and creating several thousand high skilled jobs.

As a result of the wave of Gen 10.5 lines, China’s largest displays maker, BOE, will this year become the largest display maker in the world by capacity, with 53 million square meters per year. Across all display makers in China there will be five Gen 10.5 factories be online by 2023, meaning China will possess 62% of worldwide capacity, covering a wide range of display types including conventional glass LCD and OLED displays, as well as flexible OLED and Organic LCD (OLCD) displays.

With all this capacity online there will be more pressure for display makers to differentiate their product offerings in terms of performance and application. We are already starting to see investments in the manufacture of new technologies such as flexible OLCDs, ultra-high contrast LCDs (Dual Cell LCDs) and wide colour gamut displays. As China gains lead in in display panel production, it will be interesting to see how it will influence the direction of this exciting and important industry.

In recent time, China domestic companies like BOE have overtaken LCD manufacturers from Korea and Japan. For the first three quarters of 2020, China LCD companies shipped 97.01 million square meters TFT LCD. And China"s LCD display manufacturers expect to grab 70% global LCD panel shipments very soon.

BOE started LCD manufacturing in 1994, and has grown into the largest LCD manufacturers in the world. Who has the 1st generation 10.5 TFT LCD production line. BOE"s LCD products are widely used in areas like TV, monitor, mobile phone, laptop computer etc.

TianMa Microelectronics is a professional LCD and LCM manufacturer. The company owns generation 4.5 TFT LCD production lines, mainly focuses on making medium to small size LCD product. TianMa works on consult, design and manufacturing of LCD display. Its LCDs are used in medical, instrument, telecommunication and auto industries.

TCL CSOT (TCL China Star Optoelectronics Technology Co., Ltd), established in November, 2009. TCL has six LCD panel production lines commissioned, providing panels and modules for TV and mobile products. The products range from large, small & medium display panel and touch modules.

Everdisplay Optronics (Shanghai) Co.,Ltd.(EDO) is a company dedicated to production of small-to-medium AMOLED display and research of next generation technology. The company currently has generation 4.5 OLED line.

Established in 1996, Topway is a high-tech enterprise specializing in the design and manufacturing of industrial LCD module. Topway"s TFT LCD displays are known worldwide for their flexible use, reliable quality and reliable support. More than 20 years expertise coupled with longevity of LCD modules make Topway a trustworthy partner for decades. CMRC (market research institution belonged to Statistics China before) named Topway one of the top 10 LCD manufactures in China.

The Company engages in the R&D, manufacturing, and sale of LCD panels. It offers LCD panels for notebook computers, desktop computer monitors, LCD TV sets, vehicle-mounted IPC, consumer electronics products, mobile devices, tablet PCs, desktop PCs, and industrial displays.

Founded in 2008，Yunnan OLiGHTEK Opto-Electronic Technology Co.,Ltd. dedicated themselves to developing high definition AMOLED (Active Matrix-Organic Light Emitting Diode) technology and micro-displays.

Contrast is one of the main factors that affect the display effect of the liquid crystal module. The so-called contrast refers to the contrast between the bright area and the dark area in the display screen of the liquid crystal module. For monochrome displays, the higher the contrast, the clearer the display, while for color displays, the higher the contrast, the more vivid and vivid the image. There are two main contrast parameters for liquid crystal modules, one is the typical value, and the other is the maximum value. The maximum value is often an instantaneous value, which is not representative, and the typical value has reference value. At present, the contrast ratio of mainstream liquid crystal modules is generally at the level of 400:1 to 600:1, and the good ones can reach 1000:1 or even higher. The contrast of the liquid crystal module is too low, it is difficult to see the display content.

The contrast of the liquid crystal module directly affects the gray level and color level performance in the image. The increase in contrast will make the image have a stronger sense of hierarchy, and the bright and dark areas will be obvious, which means that the user can more easily see the image in the dark and gray conditions of the scene. How to improve the contrast of the LCD module? There are several ways.

This program is the most economical. For liquid crystal modules, different viewing angles require different driving voltages. If the voltage is too low, the LCD module will be dim. When the voltage is too high, the LCD module will display a non-selected segment (ghosting). Therefore, when discussing the best contrast, we must first determine the voltage, and improve the contrast of the liquid crystal module by optimizing the voltage.

The contrast of the liquid crystal module can be improved by improving the panel technology of the liquid crystal module, and the contrast of the display screen using a TN panel is relatively low. IPS and VA technologies can be adopted, that is, liquid crystal modules using IPS type panels and VA type panels. The contrast ratio of the liquid crystal modules of these two types of panels is much higher than that of TN. And generally, the current LCD module manufacturer adopts this technology.

The higher the polarization efficiency of the polarizer, the better the contrast of the liquid crystal module. The effect of the negative display is the most obvious. If the polarization degree of the polarizer is changed from 98% to 99%, the contrast of the negative LCD display can be increased from 45 to more than 1000, and the contrast of the positive LCD can be increased from 7 to 10 . For ambient light, the stronger the reflectivity of the polarizer, the better the contrast; when using a backlight, the higher the transmittance of the polarizer, the better the contrast.

The initial alignment of the liquid crystal molecules in the liquid crystal module determines the contrast, response time, viewing angle and other properties of the display screen, and the alignment layer material can induce uniform alignment of the liquid crystal molecules. The new type of soluble polyimide uses high-quality rubbing fibers and high-quality rubbing equipment to make the liquid crystal molecules evenly arranged, thereby improving the contrast of the liquid crystal module.