1. Whether the brightness of the lamp bead is uniform: when observing the brightness, observe whether the light of the lamp bead is uniform, and pay attention to the appearance of color difference when observing the white light. Thin white paper may not be visible, so a certain thickness of propylene is used. Colorless is one of the most critical identification methods of quality difference, and also one of the main reasons for the price difference of full-color LED screens.
2. White balance effect: The white balance effect is one of the important indicators of the display screen. In color science, pure white will be displayed when the ratio of red, green and blue primary colors is 1:4.6:0.16. If there is a little deviation in the actual ratio, there will be a deviation in the white balance. Generally, it is necessary to pay attention to whether there is blueish or yellow-green phenomenon in white. The quality of white balance is mainly determined by the control system of the display screen, and the tube core also has an impact on the color reversibility.
3. Lamp bead temperature: After lighting up for a period of time, touch the LED lamp bead by hand. High temperature indicates instability.
4. Whether there is color block: color block refers to the obvious color difference between adjacent modules. 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.
5. Color reversibility: color reversibility refers to the reversibility of the display screen to the color, which means that the color displayed on the display screen should be highly consistent with the color of the playback source, so as to restore the authenticity of the image