The display consists of eight parts: line scanning circuit, field scanning circuit, video processing circuit, video amplification circuit, synchronous signal processing circuit, brightness level circuit, automatic brightness control circuit, power supply and picture tube.
At present, the most popular display is VGA color display, but some users still use TTL color display, so this circuit contains the contents of these two displays. The main function of the video processing circuit of VGA display is to send the R, G and B analog pulse signals sent by the computer to the video amplification circuit after video processing. Most video processing circuits use M5 1387 or LM 1203N chips. The video processing circuit of TTL color display first amplifies and shapes the TTL digital signal, then encodes and decodes it, and then converts the TTL signal into an analog signal and sends it to the video amplification circuit. Transistors are generally used for shaping and amplification, and N82S 147AN or N82S 135N are often used for code amplification. A few years ago, discrete components were often used in D/A conversion circuits, but now integrated circuits are used. The video processing circuits of both monitors have the functions of contrast control and brightness balance adjustment.
What are the characteristics of flat panel displays?
The display device itself is a flat panel, and the general display has no electron beam tube. As a large screen display, there is no problem of projection distance, so it is an ideal display. Because it mostly adopts matrix control, it is also called matrix control flat panel display or matrix display for short. The display materials it controls are: electroluminescent materials, light-emitting diodes, plasma, liquid crystals and so on.
In recent years, the display technology has developed rapidly, and the flat panel display is very different from the traditional video image display because of its completely different display and manufacturing technology. The traditional video image display is mainly cathode ray tube CRT flat panel display and the main difference between flat panel display is the change of weight and volume. The thickness of flat panel display is generally less than 10cm (4in), but there are other differences, such as display principle, manufacturing materials, technology and various technologies of video image display and driving.
What is the working principle of flat panel display and what are the related contents of flat panel display characteristics? Bian Xiao will tell you a lot today. With the diversification of display modes, the rising range of scanning frequency becomes wider, and the frequency and polarity of line field synchronization signals also change. According to the requirements of the line oscillator chip for the polarity of synchronization signals, the circuit should provide synchronization signals with the same polarity. In addition, the amplitude of the synchronization signal should be large enough, and the flat panel display device completely conforms to the inevitable trend of the future image display development.