The response time of a VGA liquid crystal display refers to the speed at which images are refreshed on the liquid crystal display, usually measured in milliseconds (ms). Response time is one of the most important performance indicators for a monitor to display images, because it affects the clarity, color and contrast of images on the screen, especially for high-demand applications such as playing games and watching movies.

Generally speaking, the shorter the reaction time, the smoother the image, because the screen can refresh faster without blurring, ghosting, etc. The response time of the current VGA liquid crystal display is mostly between 1~5ms.

Below, the meaning and influencing factors of reaction time will be explained in detail:

 

1. What is reaction time?

Latency is usually defined as the time elapsed from when the display receives a command to start displaying an image to when it finishes drawing the image. In general, there are two types of reaction times:

  • Black and White Response Time (Black to White)

Black and white response time is mostly for grayscale transition detection. This method relies on changes in grayscale images to determine response time. Black and white response time usually refers to the fastest response time of the display, and this value will be much smaller than the color response time.

  • color response time

Color response time refers to the time it takes for a monitor to process a color image from when the screen receives instructions to when it completes the display. Color response times are usually slower than black and white response times, at 1ms to 10ms.

Response time is generally used to describe the performance of liquid crystal displays, but different manufacturers have different definitions and test methods for response time. By comparing the black-and-white or color response times of different displays provided by manufacturers, consumers can get a general idea of their performance .

 

2. Influencing factors of reaction time

As mentioned above, the response time refers to the time from receiving a signal to displaying an image, and the response time of a liquid crystal display has a very close relationship with the pixel interval of the screen. The smaller the pixel spacing, the shorter the response time and the smoother the image.

 

In addition, the reaction time is also affected by the following factors:

(1) Liquid crystal material characteristics

The material composition and structure of the LCD panel will directly affect the response time of the display. Currently, TN, VA, and IPS liquid crystal materials are mostly used in the market. Among them, the response time of TN screen is the fastest, about 1ms, while the response time of VA and IPS is usually between 2-5ms.

(2) Circuit factors

LCD response time is also affected by circuit design and board technology. The response speed of the signal sending circuit and image preprocessing circuit for transmitting image data directly affects the response time of the display screen.

(3) Backlight module design

Backlight module design also affects response time. The backlight module that adopts the stepless AC dimming method usually has a faster response speed. At the same time, the greater the contrast between the backlight color and the background color, the faster the response time of the display screen.

To sum up, the response time of LCD monitors is determined by multiple factors. When consumers purchase LCD monitors, they should not only look at the performance index of response time, but also consider other aspects, such as resolution, color, etc. restore etc.