Question

How to judge the quality of COB LED screen?

Answer 1

COB LED screen (Chip On Board LED Display) is an advanced LED display technology in which LED chips are directly packaged on the substrate to form a high-density, highly integrated display module. To judge the quality of COB LED screen, you can inspect it from the following aspects:

1. Flatness: Observe the surface flatness of the display screen. The surface of a high-quality COB LED screen should be flat with no obvious bulges or depressions to ensure that the displayed image is not distorted. The quality of flatness is mainly determined by the production process.

2. Brightness and viewing angle: Brightness is one of the important indicators for evaluating the quality of LED screens. For COB LED screens used indoors, the brightness should be within a reasonable range to ensure viewing comfort; for COB LED screens used outdoors, higher brightness is required to cope with the impact of ambient light. At the same time, the viewing angle is also an important consideration. A high-quality COB LED screen should have a large viewing angle to ensure good visual effects from all angles.

3. White balance effect: White balance effect is one of the important indicators of the display screen. When the ratio of the three primary colors of red, green and blue reaches the ideal value, the display screen can display pure white. If the actual ratio deviates, there will be a deviation in the white balance, such as a bluish or yellowish-green color. The quality of white balance is mainly determined by the control system of the display screen and the quality of the LED chip.

4. Display effect: A high-quality COB LED screen should have good display effect, including color reproduction, contrast, resolution, etc. The color reproduction degree should be high to truly restore the color of the image; the contrast should be moderate to ensure the layering and three-dimensionality of the image; the resolution should be high to show more image details.

5. Stability and reliability: COB LED screens should have stable and reliable performance and be able to operate stably for a long time without problems such as flickering, screen blur, dead lights and dead pixels. At the same time, its service life should also be longer to reduce usage costs.

6. Energy saving and environmental protection performance: When evaluating the quality of COB LED screens, its energy saving and environmental protection performance should also be considered. A high-quality COB LED screen should have low energy consumption and high light efficiency to reduce usage costs and reduce environmental impact.

To sum up, to judge the quality of COB LED screens, it is necessary to consider comprehensively from many aspects. When choosing, you can choose the appropriate COB LED screen product based on actual needs and application scenarios.

Answer 2

When judging the quality of a COB LED screen, you can pay attention to its key indicators such as pixel density, brightness, contrast, and color gamut, and also understand the manufacturer's qualifications and after-sales service.

Answer 3

To judge the quality of COB LED screen, you can consider the following aspects:

1. Display effect: The display effect of COB LED screen is the most intuitive criterion. A high-quality COB LED screen should have high definition, high brightness, high contrast and high color reproduction. Images should be detailed, clear, colorful and free of distortion.

2. Uniformity: The brightness uniformity and color uniformity of the screen are also important evaluation indicators. A high-quality COB LED screen should maintain uniform brightness and color throughout the entire screen to avoid local over-brightness or darkness, color deviation, etc.

3. Reliability: The reliability of COB LED screens includes its stability, durability and safety. A high-quality screen should be able to operate stably in various environmental conditions, have a long service life, and have protective properties such as waterproof, dustproof, and impact resistance. In addition, the safety of the screen is also crucial, including electrical safety, fire safety, etc.

4. Maintainability: The maintainability of COB LED screens is also a factor that needs to be considered. High-quality screens should have easy-to-maintain features, such as modular design and convenient disassembly and assembly structures, so that they can be quickly repaired when a fault occurs.

5. Brand and after-sales service: Brand and after-sales service are also important factors in judging the quality of COB LED screens. Well-known brands usually have more advanced technology, stricter quality control systems and better after-sales service systems, and can provide users with more reliable products and better services.

To sum up, judging the quality of COB LED screens requires comprehensive consideration of display effect, uniformity, reliability, maintainability, brand and after-sales service. 

When purchasing, it is recommended to choose products from well-known brands and carefully understand the product's technical specifications, performance parameters, and after-sales service.