What is the difference between TN panel and TFT LCD
Author:Hu bin Time:2021-08-04 12:25 Browse(787)
Liquid crystal display (LCD)
Liquid crystal display (LCD).
the world's first liquid crystal display device appeared in the early 1970s.

What is the difference between TN panel and TFT LCD

it is called TN-LCD.
although it is monochrome display.
it is still promoted to electronic watches, calculators and other fields.
in the 1980s.
STN-LCD appeared, At the same time, TFT-LCD (thin film transistor) liquid crystal display technology has been developed, but the liquid crystal technology is not yet mature and difficult to popularize.
in the late 1980s and early 1990s, Japan mastered the STN-LCD and TFT-LCD production technology, The LCD industry began to develop rapidly.
TFT (thin film transistor) LCD is a kind of active matrix liquid crystal display (am-lcd).
different from TN technology,
TFT display adopts "back transparent" illumination mode, the imaginary light source path is not from top to bottom like TN liquid crystal, But from the bottom to the top.
in this way, a special light tube is set on the back of the liquid crystal.
when the light source irradiates, it is transmitted upward through the lower polarizing plate.
because the electrodes of the upper and lower interlayer are changed into FET electrodes and common electrodes.
when the FET electrode is turned on, the performance of liquid crystal molecules will also be changed, and the display purpose can be achieved by shading and transmitting light, The response time is greatly improved to about 80 ms.
because it has higher contrast and richer colors than TN-LCD.
the screen update frequency is also faster, so TFT is commonly known as "true color"
relative to DSTN.
compared with DSTNThe main feature of TFT-LCD is that each pixel is equipped with a semiconductor switching device.
because each pixel can be directly controlled by a point pulse,
each node is relatively independent and can be continuously controlled.
this design method not only improves the response speed of the display screen.
but also precisely controls the gray level of the display screen, This is the reason why TFT color is more lifelike than DSTN.
at present.
most notebook manufacturers use TFT-LCD.
the early TFT-LCD is mainly used for notebook computer manufacturing.
although TFT had great advantages over DSTN at that time.
due to technical reasons, TFT-LCD has a great advantage in response time, low cost and low cost There is still a big gap between the brightness and visual angle of the desktop TFT-LCD and the traditional CRT display.
the extremely low yield leads to its high price.
however.
with the continuous development of technology, the yield continues to improve, coupled with the emergence of some new technologies, the TFT-LCD in response time, contrast, brightness Nowadays,
the response time of most mainstream LCD displays has increased to less than 50ms, which paves the way for LCD to become mainstream.
the application market of LCD should be said to have great potential.
however, in terms of LCD panel production capacity,
LCDs in the world are mainly concentrated in Taiwan, China South Korea and Japan are the three main production bases.
Asia is the center of LCD panel R & D and manufacturing.
however, the development of Taiwan, Japan and South Korea are different.
the development of the three major producing areas is differentAt present, the mainstream TFT panels are a-Si (amorphous silicon thin film transistor) TFT technology and LTPS TFT (low temperature polycrystalline silicon) TFT technology.
in the aspect of a-Si.
the technologies of the three production bases have their own advantages.
Japanese manufacturers have developed resolution up to 2560 × Therefore, some people think that a-Si TFT technology can fully meet the needs of high-resolution products. However, due to the immaturity of the technology, It can not meet the needs of high-speed video image or animation.
LTPS TFT can save cost relatively.
this is of great significance for the promotion of TFT LCD.
at present.
Japanese manufacturers have the ability to mass produce 12.1 inch LTPS TFT LCD.
while Taiwan, China has developed LTPS component manufacturing technology and LTPS SXGA panel technology.
South Korea lacks special designers in this aspect However,
at present, LTPS technology is not mature, and the products are concentrated on small screens with low yield, Compared with LTPS,
a-Si is undoubtedly the mainstream of TFT LCDs.
the investment strategies of a-Si TFTs of Japanese companies are almost all based on the third generation LCD products.
the output is increased through the improvement of manufacturing technology and yield, To reduce costs.
Japan has been taking the high-end route.
its technology is undoubtedly the most advanced.
due to the Limited R & D force.
Taiwan's a-Si TFT technology mainly comes from the transfer of Japanese manufacturers,However, Taiwan's enterprises are generally labor-intensive with low technology content and low price, and mainly produce low-end products.
South Korea has a strong R & D strength in a-Si.
for example, Samsung mass produced the world's first 24 inch a-Si TFT lcd-240t, with a response time of less than 25ms, which can meet the needs of general applications; And the viewing angle reaches 160 degrees, which makes LCD not lose to CRT in traditional weakness.
Samsung 240t marks the maturity of large screen TFT LCD technology.
it also shows the world the strength of Korean manufacturers without doubt.
in addition to the competition between the above two TFT technologies.
sed will become a powerful enemy of TFT LCD.
however.
sed is still a concept product, It is difficult to enter the mainstream market in a short period of time.
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it is difficult to enter the mainstream market in a short period of time
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