Brief introduction of TN of LCD panel

January 1, 2019

The full name of TN is Twisted Nematic (twisted nematic) panel. The low production cost makes TN the most widely used entry-level liquid crystal panel, and it is widely used in mainstream low-end liquid crystal displays on the market. Most of the TN panels we see are modified TN+film. Film is the compensation film, which is used to make up for the lack of viewing angle of the TN panel. The viewing angle of the improved TN panel reaches 160°. The limit value measured in the case of 10:1, in fact, the image has been distorted or even color cast when the contrast drops to 100:1.

As a 6Bit panel, the TN panel can only display 64 colors of red, green, and blue, and the maximum actual color is only 262,144. Through the "dithering" technology, it can obtain more than 16 million colors. It can only display 0 to The three primary colors of 252 grayscale, so the final color display information is 16.2 M colors, instead of the true color 16.7M colors we usually call; it is more difficult to improve the contrast of the TN panel, and the problem directly exposed is the color Thin, poor reduction ability, and unnatural transition.

The advantages of TN panels are that due to the small number of output gray levels, the rapid deflection of liquid crystal molecules, and the easy improvement of response time, TN panels are basically used in liquid crystal products below 8ms on the market. In addition, Samsung has also developed a B-TN (Best-TN) panel, which is actually an improved type of TN panel, mainly in order to balance the contradiction of high-speed response of TN panels that must sacrifice image quality. At the same time, the contrast ratio can reach 700:1, which is close to MVA or early PVA panels.