LCD TV response time

The so-called reaction time is the speed at which each pixel of the LCD TV responds to the input signal, that is, the time it takes for the pixel to turn bright or turn from bright to dark (the principle is that a voltage is applied within the liquid crystal molecules, and the liquid crystal molecules are twisted and restored). Frequently speaking 25ms and 16ms refer to this reaction time. The shorter the reaction time, the less the user will feel the dragging of the tail when watching the moving picture. The reaction time is generally divided into two parts: the Rise time and the Fall time, and the representation is the sum of the two.

In the CRT TV, as long as the electron beam hits the phosphor, it can emit light immediately, and the glow residual time is extremely short, so the response time of the traditional CRT TV is only 1 to 3 ms. Therefore, reaction time is generally not mentioned in CRT TVs. Since the liquid crystal television uses liquid crystal molecules to reverse the control of light on and off, and the twisting of the liquid crystal molecules requires a process, the reaction time of the LCD television is significantly longer than that of the CRT.

From the early 25ms to the well-known 16ms to the recently emerged 12ms, the reaction time has been continuously shortened, and the old idea that LCD TVs are not suitable for entertainment is being challenged. A simple conversion can be done first: 30ms = 1/0.030 = 33 frames per second; 25ms = 1/0.025 = 40 frames per second; 16ms = 1/0.016 = 63 per second Frames; 12ms = 1/0.012 = 83 frames per second. It can be seen that the birth of 12ms means a huge improvement in LCD manufacturing.

In fact, the 12ms response time we mentioned above is the time required to switch between full black and full white screens. The driving voltage required for this kind of full white and black screen switching is relatively high, so the switching speed is compared. Fast, it can reach 12ms; while most of the practical applications are the switching of grayscale screens (the essence of which is that the liquid crystal is not completely reversed, not fully transparent), the required driving voltage is relatively low, so the switching speed is relatively slow. So together, the 75Hz refresh rate in the grayscale screen has been able to meet the needs of 12ms LCD panel.

According to the data:

Response time 30 ms = 1/0.030 = TV can display 33 frames per second, which is already able to meet the needs of DVD playback;

Reaction time 25 milliseconds = 1/0.025 = The TV can display 40 frames per second, fully satisfying the needs of DVD playback and most movies or games.