The pulse-type backlight anti-smear technique is similar to the black-inserting technique, and the effect similar to that of the black-inserting technique is obtained by accurately controlling the light and the extinction of the backlight system, but the high-end liquid crystal television is currently used for the high-end liquid crystal television because of the high cost. And the cost is low, and in the near future, it will become a necessary technology for middle and high-end liquid crystal displays.
The cause of the smear is not only the response speed, but also the holding characteristic of lcd. The speed of response is getting smaller, but we can convert the steady-state display of lcd to a pulse-type display. The so-called pulse type is that there is a time difference between the two frame pictures, and there is a time difference between the frame and the frame, which is quite different from the steady state display mode of the conventional lcd.
The black-and-black technology is based on the principle of pulse type, and the principle of the crt display is simulated, and a whole black picture is inserted between every two frames of video, so that the output of the picture is changed into a pulse type, and the frame rate is doubled. In this way, the number of valid frames displayed in each second is also consistent with the previous. At present, the lcd generally adopts a refresh rate of 60 hz, and the refresh rate after the addition of the black insertion technique can reach 120 hz.
Users with crt use experience know that when the refresh rate reaches 85 hz, we have no sense of the flicker of the picture, and the refresh rate of 120 hz does not have any effect on the visual perception function. With the adoption of the black-and-black technology, the lcd can no longer have the "retention characteristics", and the adverse effect of the smear can be more effectively eliminated.