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TFT technology

Back Source: Send:2020-07-08

In terms of a-Si, the technologies of the three production bases are different. Japanese manufacturers have developed LCD products with a resolution of up to 2560×2048. 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 images or animation. LTPS TFT can save costs, which is of great significance for the promotion of TFT LCD. At present, Japanese manufacturers have already mass-produced 12.1-inch LTPS

The ability of TFT LCD. And Taiwan, China has developed and completed LTPS component manufacturing technology and LTPS SXGA panel technology. South Korea lacks specialized designers and R&D experts in this regard, but major companies like Samsung have launched LTPS products, showing the strength of Korean manufacturers. However, the current LTPS technology is still immature, the products are concentrated on small screens, and the yield is low, the cost advantage is not yet available.

Compared with LTPS, a-Si is undoubtedly the mainstream of TFT LCD. Japanese companies' a-Si TFT investment strategies are mostly based on third-generation LCD products. Through the improvement of manufacturing technology and yield rate, the output is increased and the cost is reduced. Japan has always taken the high-end route, and its technology is undoubtedly more advanced. Due to the limited R&D power, Taiwan’s a-Si TFT technology is mainly transferred from Japanese manufacturers. However, because Taiwanese companies are generally labor-intensive and have low technological content and prices, they mainly produce low-end products. South Korea has strong R&D capabilities in a-Si. For example, Samsung has mass-produced the world’s first 24-inch a-Si TFT LCD-240T. Its response time is less than 25ms, which can meet the needs of general applications; and the viewing angle Reached 160 degrees, so that the LCD does not lose to CRT in traditional weaknesses. Samsung 240T marks the maturity of large-screen TFT LCD technology, and also shows the world that the strength of Korean manufacturers is beyond 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 conceptual product and it is difficult to enter the mainstream market in a short time.

Although LCD prices have been greatly reduced, prices are still relatively high compared to CRTs. Therefore, the cost issue is the focus of everyone's attention. In fact, the production cost of TFT is comparable to that of CRT, but the extremely low yield rate results in the high cost of TFT panel. The TFT panel is cut from a larger substrate. While 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 will not cause a problem. If there is a problem with a transistor, the corresponding color of the point corresponding to that transistor will be problematic (only a certain fixed color can be displayed), then this point is commonly referred to as the "bad point". The probability of the occurrence of dead spots is not fixed due to the location, so a substrate is likely to be wasted a lot. At present, the general LCD requires that the number of dead pixels is below 5, and some large manufacturers have reduced this standard to 3, or even 0, which will reduce the yield. Some small factories have increased the number of dead pixels. As a result, the cost will naturally drop significantly, and the quality of the products will drop accordingly. This is one of the reasons why some manufacturers can significantly reduce the price of LCDs.

Although there are many manufacturers capable of producing liquid crystal displays, there are only a handful of manufacturers that are truly capable of manufacturing TFT panels. ACER, as a well-known enterprise in the IT industry, is quite strong. Although it does not have the ability to produce TFT panels by itself,


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