After more than 20 years of research, competition and development, flat panel display has entered the role and become the mainstream product of display in the new century. There are four kinds of flat panel displays with the most fierce competition.
1. Field emission flat panel display (FED);
2. Plasma flat panel display (PDP);
3. Organic thin film electroluminescent device (OLED);
4. Thin film transistor liquid crystal flat panel display (TFT-LCD).
The principle of field emission flat panel display is similar to that of CRT,CRT, which has only one to three electron guns, at most six, while field emission display uses electron gun array (electron emission microtip array, such as diamond film cone). The display with resolution of VGA (640x480x3) needs 921600 electron emission tips with uniform performance, and material technology needs to be broken through. The United States and France have a small batch of small-size display screen production, used in the national defense industry, which is still far from industrialization and commercialization.
The plasma luminous display is formed by the plasma discharge in the tiny vacuum discharge cavity to excite the luminous material in the cavity. Its low luminous effect and high power consumption are its disadvantages (only 1.2m pulse W, while the luminous efficiency of the lamp is more than 80lm/W, 6W / square inch display area), but it has a strong competitive advantage in the field of 102~152cm diagonal large screen display. Industry experts believe that CRT, LCD and digital micromirror (DMD) projection displays can compete with PDP. From the large-screen TV market, the price of CRT projection TV is cheaper than PDP, and it is the most powerful competitor of PDP, but the brightness and clarity are not as good as the pixels and prices of PDP,LCD and DMD projection. Although the image quality, display area and capacity of color PDP have been significantly improved, its luminous efficiency, brightness and contrast can not meet the requirements of direct viewing color TV sets, and the most important thing is that its price can not be accepted by the majority of household consumers, which restricts the expansion of the color PDP market to a certain extent. Mainly in the public media display occasions, the application is becoming more and more common.
Semiconductor light emitting diode (LED) display scheme due to the successful development of GaN blue light emitting diode, it has obtained the absolute control of the super-large screen video display market, but this kind of display is only suitable for outdoor large-scale display, and there is no market for video display in small and medium-sized screens.
Experts in the display industry have been expecting organic thin film electroluminescent materials to provide real paper-thin displays. Organic thin film electroluminescence is a real light and thin solid-state flat panel display with low power consumption and wide viewing angle and high response speed (subsubtle). The cost of large-scale industrial production is very low, and the service life is only a few thousand hours. OLED will first be used as the main competitor of TFT-LCD in the foreseeable future, but it is still in the stage of research and trial production.
Liquid crystal flat panel display, especially TFT-LCD, is the only display device that catches up with and surpasses CRT in terms of brightness, contrast, power consumption, life, volume and weight. It has excellent performance, good mass production characteristics, high degree of automation, low cost of raw materials and broad space for development. It will rapidly become the mainstream product of the new century and a bright spot of global economic growth in the 21st century.
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