Which aspects of data should I look at when purchasing an LCD monitor?

There are several basic indicators for purchasing LCD:

1. High brightness: The higher the brightness value, the brighter the picture will be, and it will not be hazy or foggy. The unit of brightness is cd/m2, that is, candlepower per square meter. Low-end LCD brightness values are as low as 150 cd/m2, while high-end displays can be as high as 400 cd/m2 or even higher.

2. High contrast: The higher the contrast, the more vivid and saturated the color, and it will appear three-dimensional. On the contrary, if the contrast is low, the color will appear barren and the image will become flat. The contrast ratio varies greatly, ranging from as low as 100:1 to as high as 500:1, or even higher.

3. Wide viewing range: Simply put, the viewing range refers to the range where the picture in front of the screen can be seen clearly. The larger the viewing range, the easier it is to see; the smaller it is, as long as the viewer changes the viewing position slightly, the picture may not be clear. The algorithm of the visible range is from the middle of the picture to the clear angle range of the picture in the four directions of up, down, left and right. The larger the value, the wider the range naturally, but the ranges in the four directions are not necessarily symmetrical. When the up and down, left and right are symmetrical, some manufacturers will add the angle values on both sides, marked as horizontal: 120°; vertical: 120°; may also be separately marked as left/right: ±60°; up/down: ±60 °.

4. Fast signal response time: Signal response refers to the time it takes for the system to receive instructions from the keyboard or mouse, calculate and process them with the CPU, and then react to the display. Signal response is very important for animation and mouse movement. Generally speaking, this phenomenon only occurs on LCD liquid crystal display, and CRT traditional image display does not have this problem. The faster the signal response time, the more convenient the operation will be. One of the observation methods is to move the mouse quickly (that is, the mouse does not indicate to the system, and the system continuously responds to the display). On a general low-end LCD display, the cursor will disappear after moving quickly until The mouse reappears after a period of time, while high-end products can clearly see the movement traces during all movements.