Most of the TN panels are modified TN+film, which 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 is 160°. Of course, this is the manufacturer’s contrast ratio of 10:1. In the case of the measured limit value, the image has actually been distorted or even color cast when the contrast drops to 100:1.
As a 6Bit panel, the early TN panel with 6bit driver IC can only display 64 colors of red/green/blue, and the maximum actual color is only 262.144 kinds. Through the "dithering" technology, it can obtain more than 16 million colors. , It can only display the three primary colors of 0 to 252 gray scales, so the final color display information is 16.2 M colors, instead of the true color 16.7 M colors we usually call; it is more difficult to increase the contrast with the TN panel. The exposed problems are thin colors, poor restoration ability, and unnatural transitions. In the later stage, with 8bit, this problem was solved to a large extent, and it was able to display the three primary colors of 0 to 255 gray scales, a total of 256 gray scales. In fact, the key factor that determines the color is not the panel type, but the driver IC. In the past, 99% of TN panels provided 16.2M colors, so people naturally think that TN and 16.2M have an inevitable connection. At the same time, the 16.7M color is the patent of the wide viewing angle panel, so it left the user an impression that the TN panel is equal to 16.2M color, and the wide viewing angle panel is equal to 16.7M color.
The principle of liquid crystal display color is that there are three filter strips that only transmit red, green and blue light at the position of each pixel on the backlight board, and each strip of each pixel has an independent circuit to drive the corresponding position. The liquid crystal molecules rotate so that the red, green and blue lights of different brightness are mixed, so that the human eye can perceive various colors. When the voltage is high, the corner is large, and when the voltage is low, the corner is small, which is stepless regulation. The driving voltage is divided into 2n parts from the highest to the lowest to make the liquid crystal display n-bit color. Therefore, anyone with a little longer head knows that there is no saying that the board only supports how many bit colors. For any LCD panel, there is only a question of how many bits are added to drive the color to display the best. In other words, regardless of TN or wide viewing angle panel, if 6bit IC is loaded, then its color number is 16.2M (after dithering), if 8bit IC is loaded, then the color number is 16.7M. According to what we have summed up earlier, the panel type has nothing to do with color, so it can be inferred that a wide viewing angle panel can also be matched with a 6bit IC to provide 16.2M colors.
The advantage of the TN panel is that due to the small number of output gray levels, the deflection speed of liquid crystal molecules is fast, and the response time is easily improved. 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 panel 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. Many panel manufacturers in Taiwan produce TN panels. TN panels are soft screens, and similar water lines will appear when lightly swiped by hand.