What is a TFT screen
Author:Clumps of snow Time:2021-08-05 15:43 Browse(365)
Thin film transistor
Thin film transistors (TFTs).
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What is a TFT screen

thin film transistors (TFTs) are thin film transistors (TFTs) that drive every pixel on the LCD.
TFTs can display screen information with high speed, high brightness and high contrast.
TFTs are active matrix liquid crystal displays.
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supplement: TFTs (thin film transistors) )It means that each liquid crystal pixel is driven by a thin film transistor integrated behind the pixel, so that the screen information can be displayed with high speed, high brightness and high contrast. It is one of the best LCD color display devices at present, and its effect is close to that of CRT display, Nowadays, TFT is the mainstream display device on laptops and desktops.
every pixel of TFT is controlled by the integrated TFT.
it is an active pixel.
therefore.
not only the speed can be greatly improved, but also the contrast and brightness can be greatly improved, At the same time, the resolution has reached a very high level.
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TFT (thin film transistor) screen, which is also commonly used in high-end color screen mobile phones, is divided into 65536 colors, 260000 colors and 1600000 colors, The display effect is excellent.
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analysis of TFT technology.
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TFT (thin film transistor) LCD is a kind of active matrix type liquid crystal display (am-lcd).
TFT is a kind of thin film field effect transistor LCD
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different from TN technology,
TFT displays adopt the "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, Therefore, TFT is commonly known as "true color.
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compared with DSTN.
the main feature of TFT-LCD is that each pixel is equipped with a semiconductor switch device.
because each pixel can be directly controlled by a point pulse.
therefore, each node is relatively independent.
and can be continuously controlled.
this design method not only improves the response speed of the display screen.
the same design method The color of TFT is more realistic than that of DSTN.
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at present.
most notebook manufacturers use TFT-LCD.
the early TFT-LCD is mainly used in the manufacture of notebook computers.
although TFT has great advantages over DSTN at that time.
due to technical reasons, TFT-LCD has the advantages of high response time, low cost and low cost There is still a big gap between the brightness and viewing angle of CRT display and traditional CRT displayHowever,
with the continuous development of technology, the yield rate is increasing, and with the emergence of some new technologies, TFT-LCD has made great progress in response time, contrast, brightness and visual angle, Nowadays,
the response time of most mainstream LCD displays has been improved to less than 50ms, which paves the way for LCD to become mainstream.
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the application market of LCD should be said to have great potential.
but 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.
while Taiwan, Japan and Japan are the three main production bases At present, the mainstream TFT panels are a-Si (amorphous silicon thin film transistor).
TFT and LTPS TFT technologies.
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in terms 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 believe that a-Si TFT technology can fully meet the needs of high-resolution products, but due to the immature technology, it can not meet the needs of high-speed video image or animation.
LTPS TFT can relatively save costs.
this is of great significance for the promotion of TFT LCD.
the development of a-Si TFT technology is of great significanceAt present.
Japanese manufacturers have the capacity 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 specialized designers and R & D experts in this field.
however, major enterprises such as Samsung have launched LTPS products, It shows the strength of Korean manufacturers.
however.
at present, LTPS technology is not mature, and its products are concentrated in small screens with low yield, Compared with LTPS,
a-Si is undoubtedly the mainstream of TFT LCD at present.
the investment strategy of a-Si TFT of Japanese companies is almost 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, but because Taiwan's enterprises are generally labor-intensive, the technology content and price are low, 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; However, the viewing angle has reached 160 degrees, which makes LCD not inferior to CRT in traditional weakness.
Samsung 240t marks the maturity of large screen TFT LCD technology.
it also shows the world that the strength of Korean manufacturers is beyond doubt.
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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 conceptual product, It is difficult to enter the mainstream market in a short time.
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although LCD has been greatly reduced at present, the price is still higher than that of CRT.
therefore, the cost issue is the focus of attention.
in fact.
the production cost of TFT is the same as that of CRT, However, the low yield leads to the high cost of TFT panel.
TFT panel is cut from a large substrate.
LCD products also need a large number of transistor arrays to control the three primary colors.
the current manufacturing technology is difficult to ensure that tens of millions or even hundreds of millions of transistors on a large substrate do not have a problem.
if there is a problem with a transistor.
then that is the case The corresponding color of the point corresponding to a transistor will have problems (only certain fixed color can be displayed), so this point is commonly known as "bad point"
the probability of bad point occurrence depends on the location.
therefore, a substrate is likely to be wasted a lot.
at present, the general LCD requires less than 5 bad points.
however, some large manufacturers have reduced the standard to 3 or even 0, This will reduce the rate of good products.
and some small factories will expand the number of bad products.
in this way, the cost will naturally drop sharply, and the product quality will decline, This is one of the reasons why some manufacturers can significantly reduce the price of LCD.
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although there are many manufacturers with the ability to produce LCD at present, only a few of them have the ability to manufacture TFT panels.
this is the reason why some manufacturers can greatly reduce the price of LCDAcer is a well-known enterprise in the IT industry.
although Acer does not have the ability to produce TFT panels, it has a close relationship with Taiwan Daji and has certain advantages in technical cooperation.
however.
limited to the technical strength of Taiwan enterprises, Acer LCD products are mainly concentrated in the middle and low end.
Philips is a world-famous manufacturer of display equipment.
its display sales have been among the top in China, and it has reached an alliance with LG in South Korea to jointly develop and manufacture TFT panels.
due to technical reasons and market positioning problems, Philips products are mainly concentrated in the middle end, And in the retail market, Philips action has not been very obvious.
Samsung, as another powerful display device R & D and manufacturer,
has invested a lot of energy in LCD, and is committed to continuously enriching its product line. At present, Samsung's products cover the high, middle and low-end market.
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LCD technology is still in the continuous development The development direction of the three producing areas is different, and there is competition among them, It is these factors that promote the development of LCD.
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we also need to know about.
TFT-LCD technology.
working principle.
technical characteristics of TFT.
main characteristics of TFT-LCD.
international technical level and current situation of TFT.
market analysis of TFT-LCD.
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for details, please refer to http://baike.baidu.com/view/6261.htm.
It can also be called glass.

it's called this in the factory.
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it's called this in the factory
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