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TFT LCD Display The Working Principle
May 27, 2017

   1, TFT working principle

TFT LCD Display TFT is the abbreviation of "Thin Film Transistor", generally refers to the thin film liquid crystal display, and actually refers to the thin film transistor (matrix) - can "take the initiative" on the screen to control the individual pixels, which is The so-called active matrix TFT (active matrix TFT) origin. So how did the image produce it? The basic principle is simple: the display consists of a number of pixels that can emit any color of light, as long as the control of each pixel shows the corresponding color can achieve the purpose. In the TFT LCD generally use backlight technology, in order to accurately control the color and brightness of each pixel need to be installed in each pixel after a similar shutters switch, when the "shutters" open when the light can be through, and " Shutters "can not be passed after the light. Of course, in practice, it is not as simple as it was said. LCD (Liquid Crystal Display) is the use of the characteristics of liquid crystal (when the heating is liquid, when the crystallization of solid crystals), the general liquid crystal has three forms:

Smectic liquid crystals similar to clay

Similar to the fine match rod of the wire (Nematic) LCD

Similar to Cholestic liquid crystal

Liquid crystal displays use filaments, and when the external environment changes its molecular structure will change, and thus have different physical characteristics - to be able to achieve the purpose of light through or block the light - that is, just for example of the blinds. We know the three primary colors, so constitute the display on each pixel need to be described above three similar basic components to form, respectively, control the red, green, blue three colors. The most common is currently used twisted nematic TFT liquid crystal display (Twisted Nematic TFT LCD).

  TFT LCD Display With the early 1990s, TFT technology mature, color LCD flat panel display rapid development, less than 10 years, TFT-LCD quickly grow into a mainstream display, which has its advantages are inseparable. The main features are:

(1) the use of good features: low voltage applications, low drive voltage, solidification of the use of improved safety and reliability; flat, and thin, saving a lot of raw materials and the use of space; low power consumption, it is about CRT display TFT-LCD products are also modeled, size series, variety, easy to use flexible, maintenance, update, and so on, the TFT-LCD is only one percent of the CRT, saving a lot of energy; , Easy to upgrade, long life and many other features. The display range covers all applications ranging from 1 inch to 40 inches in the range of applications and the projection plane is full size display terminal; display quality from the simplest monochrome character graphics to high resolution, high color fidelity, High brightness, high contrast, high response speed of various specifications of the model video display; display methods are direct type, projection type, perspective, but also reflective.

(2) good environmental characteristics: no radiation, no flicker, no harm to the health of the user. In particular, the emergence of TFT-LCD electronic books and periodicals, will bring mankind into paperless office, paperless printing era, triggering human learning, communication and record the way of civilization revolution.

(3)TFT LCD Display  Wide range of applications, from -20 ℃ to +50 ℃ temperature range can be used normally, after temperature curing TFT-LCD low temperature operating temperature can reach minus 80 ℃. Can be used as a mobile terminal display, desktop terminal display, but also for large-screen projection TV, is a good performance full-size video display terminal.

(4) manufacturing technology of high degree of automation, large-scale industrial production characteristics. TFT-LCD industry technology is mature, large-scale production of finished product rate of 90 [%] or more.

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