Six aspects to evaluate the quality of a display screen

2024-01-22 09:49:45

1. Flatness

The surface flatness of the display screen must be within ±1m to ensure that the displayed image is not distorted. Local bulges or recesses will cause blind spots in the viewing angle of the display screen. The quality of flatness is mainly determined by the production process.

2.Brightness and viewing angle

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The brightness of the indoor full-color screen must be above 800cd/m2, and the brightness of the outdoor full-color screen must be above 1500cd/m2 to ensure the normal operation of the display. Otherwise, the displayed image will be unclear because the brightness is too low.

The brightness is mainly determined by the quality of the LED tube. The size of the viewing angle directly determines the audience size of the display screen, so the bigger the better. The size of the viewing angle is mainly determined by the packaging method of the die.

3. White balance effect

The white balance effect is the most important indicator of the display screen. In terms of color theory, pure white will be displayed when the ratio of the three primary colors of red, green and blue is 3: 6: 1. If the actual ratio is slightly deviated, a white balance deviation will occur.

Generally, Pay attention to whether the white color is bluish or yellowish-green. The quality of the white balance is mainly determined by the control system of the display screen. The tube core also affects the color reproduction.

4. Color restoration

Color restoration refers to the display's ability to restore colors. That is, the color displayed on the display must be highly consistent with the color of the playback source, so as to ensure the reality of the image.

5. Is there any mosaic or dead spot phenomenon?

Mosaic refers to the small squares that appear on the display screen that are always bright or black. It is a phenomenon of module necrosis. The main reason is that the quality of the connector used in the display screen is not good enough. The number of bright or normally dark single points and dead points is mainly determined by the quality of the tube core.

6. Is there any color block?

Color block refers to the obvious color difference between adjacent modules, and the color transition is based on the module. The color block phenomenon is mainly caused by poor control system, low gray level and low scanning frequency.