What is the working principle of TFTLCD display?

What is the working principle of TFTLCD display? 1. The working principle of TFT-LCD We all know that the working principle of CRT is that the filament heats up after being energized, the cathode is excited, and an electron flow is emitted. The electron flow is accelerated by the internal metal layer with high voltage, and is formed by lens focusing The electron beam hits the phosphor screen to make the phosphor glow. The principle of LCD is completely different from that of CRT. LCD requires a light source from the back. When the light beam passes through this layer of liquid crystal, the liquid crystal will be side by side or in an irregular twisted shape, so the liquid crystal is more like a gate. We can choose whether the light penetrates or not. The screen sees different shades and patchwork images. The current mainstream mobile LCD screen displays are thin film transistor LCDs, which are developed and expanded from the original LCD screentechnology. TFT liquid crystal has a semiconductor switch for each pixel, so as to completely control a pixel point independently. The mobile LCD screen material is sandwiched between the TFT glass layer and the color filter layer, and can be achieved by changing the voltage value that stimulates the liquid crystal. Controls the intensity and color of the light that appears after the Z. In general, liquid crystals are transparent unless a voltage is applied. When pressurized, a part changes and becomes opaque. The conversion speed of mobile LCD screen is usually very slow (will be described in detail later). In 1992, emi announced the invention of a new liquid crystal display technology ferroelectric liquid crystal FLCD (ferroelectriclcds). The advantage of ferroelectric liquid crystal is that the response speed is fast, which can reach microsecond level. Moreover, the current state can be maintained without changing the voltage, that is, more power is saved, which is very meaningful for portable devices such as notebook computers and pdas. FLCD has many advantages, but there are few products on the market at present, because FLCD is very sensitive to vibration, and it is easy to damage the crystal, but it will definitely be improved in the future. Although the future of ferroelectric liquid crystal FLCD is still unknown, it also has the advantages of high contrast and super large viewing angle, which will have a certain impact on the mainstream TFT in the market. What is the response time of FLCD? Under normal operating temperature, it is only 70us! Such a short time can almost be ignored. Second, the application characteristics of TFT-LCD. A very important factor that promotes the rapid development of TFT-LCD is that it has the following main Application features: (1) Good use characteristics: low voltage application, low driving voltage, improved safety and reliability of solidification; flat, light and thin, saving a lot of raw materials and space; low power consumption, its power consumption is about It is one tenth of the CRT display, and the reflective TFT-LCD is even only about one percent of the CRT, which saves a lot of energy; TFT-mobile phone LCD products also have serialized specifications, models, sizes, various varieties, convenient and flexible use, Maintenance, update, easy upgrade, long service life and many other features. The display range covers the application range of all displays from 1 inch to 40 inches and a large projection plane, which is a full-size display terminal; the display quality ranges from simple monochrome character graphics to high resolution, high color fidelity, High-brightness, high-contrast, high-response speed video displays of various specifications and models; display methods include direct-view, projection, see-through, and reflective. (2) Good environmental protection characteristics: no radiation, no flicker, no damage to the health of users. In particular, the emergence of TFT-LCD electronic books will bring mankind into the era of paperless office and paperless printing, triggering a revolution in the way of human learning, dissemination and recording civilization. (3) Wide application range: It can be used normally in the temperature range from -20°C to +50°C, and the low-temperature working temperature of TFT-LCD after temperature strengthening treatment can reach minus 80°C. It can be used as a mobile terminal display, a desktop terminal display, and a large-screen projection TV. It is a full-size video display terminal with excellent performance. (4) The degree of automation of manufacturing technology is high: the characteristics of large-scale industrial production are good. The technology of tft- industry is mature, and the yield rate of large-scale production reaches more than 90]. (5) TFT-mobile phone LCD is easy to integrate and update: it is a perfect combination of large-scale semiconductor integrated circuit technology and light source technology, and has great potential for continued development. At present, there are amorphous, polycrystalline and monocrystalline silicon TFT-LCDs, and there will be TFTs of other materials in the future, including glass substrates and plastic substrates.

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