What are TFT, TFT and LCD what is the difference?
LCD liquid crystal display
LCD is a liquid crystal display name: it includes TFT, OLED, UFB, TFD, STN and other types of liquid crystal display.
The working principle of liquid crystal displays
Liquid crystal display (LCD) is now very common display. It has the advantages of small volume, light weight, energy saving, low radiation, easy to carry etc.. The principle of liquid crystal display (LCD) and cathode ray tube display (CRT) are not the same. LCD is based on the electro-optic effect of liquid crystal display device. Includes the display section displays the character; matrix display characters, graphics, image display device; matrix display large screen LCD TV lcd. The working principle of liquid crystal display is the use of the physical properties of the liquid, the conduction when energized, the alignment of liquid crystal is in order, so that the light can; no electricity, arrangement is chaotic, prevent light. The working principle of the three kinds of liquid crystal display.
TFT thin film transistor
TFT thin film transistor (ThinFilmTransistor), is a kind of active matrix type liquid crystal display AM-LCD, TFT set up a special light in the back of the LCD, can "control pixel active" on the screen the individual, this is the so-called active matrix TFT (activematrixTFT) of the source, which can greatly improve the reaction time, the reaction time is generally TFT faster, 80ms, and STN 200ms, if you want to improve will flicker phenomenon.
The principle of TFT panel
And because TFT is an active matrix LCD can make liquid crystal arrangement has the memory, will not immediately disappear after recovery in current. TFT also improved the STN flashes (ripple) - fuzzy phenomenon effectively and improve the ability of playing dynamic image. Compared with STN, TFT has excellent color saturation, reducing power and high contrast, but the drawback is that the comparison of power consumption, and the cost is relatively high.
TFT-LCD technology is a kind of technology, microelectronic technology and liquid crystal display technology combined. People use micro fine processing in the Si, transplanted to the TFT array processing in a large area of the glass substrate, and then the array substrate and the other a color filter, and use of LCD technology has matured, the formation of a liquid crystal box combination, and then after the process such as polarizer coating process, and finally the formation of liquid crystal display (LCD).
In TFT-LCD, the function of TFT is the equivalent of a switching tube. The TFT are three terminal devices. The general production of the semiconductor layer on the glass substrate, at its two ends are connected with the source electrode and the drain electrode. And through the gate insulating film, opposite the semiconductor, a gate. The voltage applied to the gate to control the source, drain current flow between the.
To make a long story short, simple and passive matrix TFT-LCD TN-LCD, STN-LCD is different, it in every pixel LCD screen are arranged on a thin film transistor (TFT), which can effectively overcome the interference of non gating, the static characteristic and the LCD screen is independent of the number of scan lines, thus greatly improving the image quality. And the switch unit (TFT) characteristics, to meet the on state resistance and low resistance is very large, close this requirement.
