What is grayscale display?

Speaking of gray response time, let's first look at what is gray. We see that every point on the LCD screen, that is, a pixel, is composed of three sub-pixels of red, green and blue (RGB). To realize the color change of the picture, it is necessary to control the brightness of three RGB sub-pixels to "adjust" different colors. The more levels of light and shade, the more delicate the picture effect can be. Take an 8-bit panel as an example, it can display 256 brightness levels (2 to the 8th power), so we call it 256 gray scale. Due to the rotation of liquid crystal molecules, every point on the LCD screen changes from the front color to the back color, and there will be a time process, which is what we usually call response time. Because the conversion process between different gray levels of each pixel is different in length and complicated, it is difficult to express it by an objective scale. Therefore, the traditional definition of liquid crystal response time tries to take the conversion speed of liquid crystal molecules from all black to all white as the response time of liquid crystal panel. Because the conversion speed of liquid crystal molecules from black to white and from white to black is not exactly the same, in order to mark the reaction speed of liquid crystal panel as meaningfully as possible, the traditional definition of response time is basically based on the overall response time of "black-white-black". But when we play games or watch movies, the screen content can't just switch between the blackest and whitest, but colorful pictures or changes at different levels, all of which switch between gray levels. In fact, the switching speed and twist angle of liquid crystal molecules are determined by the applied voltage. The liquid crystal molecules from all black to all white face the largest torsion angle and need to apply a large voltage. At this time, the liquid crystal molecules twist faster. However, it is difficult to switch between different shades of gray, and the images seen on the display every day are the result of gray changes, so the measurement method of black-and-white response can not correctly express the practical significance. So the concept of gray response time came out. It should be noted that although the gray response is more difficult to control and takes longer, the actual situation may be completely opposite. Because manufacturers can greatly improve the gray-scale response time through special technology, which is much shorter than the traditional black-and-white response time. For example, a product with a black-and-white response time of 25ms can have a gray-scale response time of 8ms by using a response time acceleration chip. The gray-scale response time and the original black-and-white response time are very different in meaning and nature. There is no clear correspondence between them, but they are all descriptions of the liquid crystal response time. Since 2005, gray response has been gradually adopted by many manufacturers. Generally speaking, these products usually adopt better response time control methods, such as the response time of each pixel is more stable and unified. Products with short gray-scale response time have less shadow phenomenon and better picture quality, especially when playing moving images, gamers or users who like watching DVD can consider this parameter of LCD more.