Understanding Refresh Rates and Response Times in LCDs

By Iris Han

As one of the mainstream of modern display technology, TFT liquid crystal display has been widely welcomed for its advantages of high definition, natural and true color, and strong color reproduction ability. When we buy TFT LCD monitors, we often hear the two concepts of refresh rate and response time. What are they? What does it do? For what kind of users, what kind of refresh rate and response time is the best, these issues are worthy of our in-depth discussion.

What is the refresh rate and response time of a TFT LCD? The refresh rate of a TFT LCD screen refers to the number of times the screen can be refreshed per second. In layman’s terms, it is how many times the display can refresh the image. The higher the refresh rate, the more times the displayed screen will be refreshed per second, and the screen transition will be smoother and more stable. There are many factors that affect the refresh rate of a TFT LCD display, such as graphics card performance, display resolution, etc., but in any case, it is described in HZ, the higher the HZ, the faster the screen refresh. The response time refers to the time required for the LCD screen to respond to the instructions and display the corresponding images after receiving the instructions from the computer. The response time is usually in milliseconds (ms), which reflects the speed at which each pixel of the LCD display responds to the input signal, that is, the speed at which the pixel turns from dark to bright or from bright to dark.

The smaller its value, the user will not have the feeling of tail dragging when watching a moving picture. Generally, the reaction rate is divided into two parts: Rising  and Falling, and the sum of the two is used for expression. allow. It means that the ability of the display screen to resist the residual effect is stronger, and it can display a more delicate and smooth picture, and can effectively reduce eye fatigue.

The effect of refresh rate and response time of TFT liquid crystal display The refresh rate and response time of the TFT liquid crystal display are important parameters of the liquid crystal display, and they have a great impact on the user experience. If the refresh rate is too low or the response time is long, the display screen will flicker and shake, which will affect the comfort of the eyes. Long-term use will easily cause visual fatigue and discomfort, even for some industries that require high image stability, such as games. , Photography, etc., it is more important to pay attention to the refresh rate and response time. The refresh rate mainly affects the fluency of the dynamic picture. The higher the frame rate of the high-speed dynamic picture is, the smoother the refresh is, the more coherent the picture is, and the visual deceleration is helpful for the reaction. The response time affects the clarity of the dynamic picture, which can reduce the blur caused by smear and reduce the delay of the picture that everyone sees.

The refresh rate and response time range suitable for TFT liquid crystal display For the vast majority of general users, it is usually enough to choose a 60 Hz LCD monitor, which can already meet the needs of most general applications, whether it is text, images, videos and other content can be displayed smoothly and stably. For some gamers and high-end photography enthusiasts, the use of LCD screens with a high refresh rate of 120Hz or above will have different display effects, which will not only enable players to obtain smoother picture fluency during the game, but also It allows users to achieve higher office efficiency in tedious work

Refresh rate is divided into vertical Refresh rate and horizontal Refresh rate. Generally speaking, Refresh rate refers to vertical Refresh rate. The vertical Refresh rate indicates the number of times the screen image is redrawn per second, that is, the number of times the screen is refreshed per second, in Hz. The higher the Refresh rate, the better, the more stable the image, the more natural and clear the image display, and the less impact on the eyes. The lower the refresh frequency, the more severe the flickering and shaking of the image, and the faster the eye fatigue. Generally speaking, if the refresh rate is above 80Hz, image flicker and jitter can be completely eliminated, and the eyes will not be too tired.

In terms of response time, generally speaking, a response time of 5ms or less is sufficient to meet the needs of most users, but for special groups of people, such as gamers and professional photographers, a lower response time is more important , because they pay more attention to the fluency of the screen and the accuracy of color reproduction.

So what aspects would you pay attention to when it comes to refresh rate and response time?Would you spend more money to pay for higher refresh rate and response time?

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