Overview of HTPS LCD panel technology
With the popularization of DVD laser disc players and digital broadcasting systems, the number of high-resolution image sources is also gradually increasing. The market for digital projectors continues to expand as the front projector, large-screen HDTV LCD projection TV, and other home projector markets. This growth has also stimulated consumer demand for three-chip LCD projectors. This article will analyze the HTPS LCD panel in the three-chip LCD projector and introduce its features.
With the increasing demand for business presentations and the recent increase in projector applications in the education market, the demand for HTPS panels for commercial projectors has also continued to rise. At the same time, the popularity of DVD players and digital broadcasting has also stimulated the rapid growth of customers' demand for front projectors (Front projectors) and large-screen LCD projection TVs (Large-screen projecTIon TV).
HTPS LCD technology has long led the three-chip LCD projection system to the projector market, and among the manufacturers of liquid-crystal light valve, the three-chip LCD projection system based on HTPS LCD technology also has Nearly 55% of the global market share. This is because more advanced liquid crystal and high aperture ratio technologies can provide low-power HTPS products with good light efficiency, high brightness performance, and rich color reproduction capabilities without harming the eyes or the environment.
What is HTPS?
HTPS is the abbreviation of High Temperature Poly-Silicon, which translates to Chinese meaning "high temperature polysilicon", commonly known as high temperature glass. It is a member of the LCD display family and belongs to the active dot matrix LCD (AcTIve Matrix LCD). Therefore, HTPS is also a type of TFT (Thin Film Transistor; thin film transistor).
HTPS LCD is one of the polysilicon TFT LCD process technologies. The reason why it is called high temperature glass is because in the manufacturing process of the panel, there is a Laser Anneal (laser annealing) process, its temperature exceeds 1000 degrees Celsius. In the early stage of the development of the polysilicon process, in order to transform the amorphous silicon structure of the glass substrate into the polysilicon structure, high-temperature oxidation technology above 1000 degrees Celsius must be used to convert the amorphous silicon structure characteristics into the polysilicon structure. Since ordinary glass cannot be processed at such a high temperature, only quartz glass can be processed in this way, and its price is relatively expensive and the size is relatively small. Therefore, in the early stage of the development of polysilicon manufacturing process, manufacturers took the amorphous silicon route based on cost considerations.
In addition, there is another LTPS LCD (Low Temperature Poly-Silicon; Low Temperature Poly-Si) that also belongs to TFT LCD. The reason why LTPS LCD is called low temperature is because its process temperature is not so high, only about 500-600 degrees Celsius, and it is slightly different according to the process of each manufacturer. The low-temperature polysilicon process uses excimer laser as a heat source. After the laser light passes through the projection system, a laser beam with uniform energy distribution will be generated and projected on the glass substrate of the amorphous silicon structure. After radiated energy, it will transform into a polysilicon structure. Since the entire processing process is completed below 600 degrees Celsius, general glass substrates are applicable. The main feature of low-temperature polysilicon technology is to change the liquid crystal structure to improve the performance of traditional amorphous silicon liquid crystal technology and reduce manufacturing costs. Because LTPS technology can improve the electron mobility by 200 (cm2 / V-sec), it is conducive to miniaturization of TFT components, and improves the aperture ratio of the panel, which increases the display brightness and reduces the power consumption rate. In addition, the low-temperature manufacturing process facilitates the use of glass substrates, which can significantly reduce production costs. The main uses of HTPS and LTPS are different.
HTPS LCD applications
The application field of HTPS is usually used as an enlarged display product. For example, LCD projectors, rear projection TVs, etc. In general, the LCD screen of a mobile phone or a computer is of a direct-view type, that is, a user can directly view the screen and read information. Although HTPS is also a type of TFT, it cannot be directly used for mobile phones or computer screens.
The application of HTPS LCD is roughly divided into the following three types: OHD (Over Head Display), Helmet and LV (Light Valve).
Its main purpose is introduced as follows:
OHD: Head-up display, project the image on the windshield (or transparent glass), used in cars or airplanes, you can get a glimpse of its appearance in many air combat films;
Helmet: This refers to the visualization used exclusively in the helmet of Virtual Reality;
LV: Can be translated into light valve. When the HTPS moves in the LCD projector, because all the light will pass through the HTPS, and the HTPS determines the degree of light penetration, it is called the "valve of light".
HTPS LCD panel features
HTPS LCD has the advantages of small size, high resolution, high penetration, etc., so it is particularly suitable for use as a three-piece transmissive liquid crystal projector. The three-piece transmissive liquid crystal projector using HTPS LCD has three characteristics, which can provide the viewer with a bright, soft and natural color correct visual experience.
Natural colors (Natural Images)
The three-chip LCD projection system can accurately control the R, G, and B colors and form the pixels of the image, so it can make the picture more natural and vivid.
Gentle on the Eyes
Fast moving pictures and images will not exhibit color separation, such as the rainbow effect.
Sufficient brightness (Bright Images)
Since the HTPS LCD uses three-color light for full-time projection, its light efficiency is very high, and users can view bright and clear images.
Currently, there are two manufacturers of HTPS LCDs, Epson and Sony. Among them, Epson has the largest production capacity. Since the production began in 1987, it has produced a total of 20 million units in July 2004. There are currently three Epson manufacturers. HTPS factory is the world's largest HTPS LCD manufacturer.
Conclusion With the popularization of DVD laser disc players and digital broadcasting systems, the number of high-resolution image sources is gradually increasing. The market for front projectors, large-screen HDTV LCD projection TVs, and other home projectors has also expanded rapidly. The market for digital projectors continues to expand, the increased demand for business presentations, and the demand for classroom computerization all stimulate the growth of the market. This growth has also stimulated consumer demand for home front projectors and large-screen HDTV LCD projection TVs featuring three-chip LCD design technologies. These products allow users to enjoy digital information content in large-screen quality.
Manufacturers developing HTPS LCD will also focus on producing panel products with higher aperture ratio, higher contrast ratio, brighter and smaller size to design brighter, smaller and more space-saving front projectors and large-screen HDTV LCD projection TV, and also have price competitiveness. Now there are more HTPS TFT LCD panels developed for home theater projectors, such as 1.8cm 720p wide screen format products and 1.4cm 480p wide screen products. From the point of view of manufacturers' full efforts in developing updated panel products, the future projection market competition will be more intense, and a more beautiful visual feast will also make discerning consumers the biggest winners.
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