The reaction time is generally divided into two parts: rise time (Rise time) and Descending time (Fall time). CRT TV Medium, as long as electron beam Strike Phosphor It can emit light immediately, but the residual time of glow is very short, so the reaction time of traditional CRT TV is only 1~3ms. Because LCD TV uses liquid crystal molecule torsion to control light On-off The torsion of liquid crystal molecules requires a process, so LCD TV The reaction time was significantly longer than that of CRT. 
reaction time From the early 25ms to the well-known 16ms to the recent 12ms, the response time has been shortened, and the old idea that LCD TV is not suitable for entertainment is being challenged. In fact, the 12ms response time is the time required for switching between all black and all white images driving voltage It is relatively high, so the switching speed is relatively fast, up to 12ms; Most of them are Gray scale The driving voltage required for screen switching (the essence of which is that the liquid crystal is not completely twisted and transparent) is relatively low, so the switching speed is relatively slow. So to sum up Gray scale 75Hz Refresh rate It can meet the requirement of 12ms LCD panel Needs. According to the data:
The response time is 30ms=1/0.030=the TV can display 33 frames per second, which is enough DVD Playback needs; Response time 25 ms=1/0.025=TV can display 40 frames per second, which fully meets the needs of DVD playing and most movies or games.
along with Liquid crystal display The increasing popularity of, Gray scale Response time is also improving, such as ASUS 、 Samsung 、 LG 5ms, 2ms and other overspeed has begun to appear in the products of major brand display manufacturers response time The dragging phenomenon of the picture is basically eliminated on the display of. For example, in ASUS MS series LCD products, Gray scale response time It has reached 2ms, and the ultra short response time will also be one of the important standards for the evaluation of future displays. Overview of reaction time
Reaction time (RT) is Psychological experiment The earliest and most widely used Reaction variable one of. The response cannot occur at the same time as the stimulus is given. Response time refers to the time interval from the presentation of stimulus to the beginning of response. Stimulus applied to Organism The time required from then to the beginning of the apparent reaction. Time period included in reaction time
There are three periods:
1、 Irritant receptor The time when the excitation is generated and its impulse is transmitted to the sensory neurons; III Effector The time when the effect activity starts after receiving the impulse. The presentation of stimulus causes the beginning of a process, which is latent in the body until the process reaches the muscle Effector Only then can an explicit effect on the environment be produced. Therefore, the reaction time is often called“ Latency period of reaction ”。 stay Latency period of reaction Contains sense organ Time required for brain processing, afferent and efferent nerves, and muscles Effector The time required for reaction, of which brain processing takes the most time. Human reaction time: The reaction time of ordinary people should be more than 0.2 seconds, and that of trained athletes should not be less than 0.1 seconds.
International Track and Field held in Shanghai in September 2001 Golden Grand Prix Men's 110m Hurdles Of the game, Liu Xiang The starting reaction time of is "0.155 seconds, ranking second among the eight runners". It is worth noting that Arnold Einstein of the United States Rush Punished, according to the commentary at the time. The concept of preemption is no longer simply "starting before the gunshot". If the athlete starts within 0.1 seconds after the gunshot is fired, it means that the athlete has a prediction before the gunshot is fired (that is, he is gambling on when the gunshot is fired), which is also called preemption. According to the above information, the fastest reaction time of normal people should not be less than 0.1 seconds.
