Technical analysis on improving the display effect of LED display

The gray level refers to the brightness level that can be distinguished between the darkest and the brightest of the single-color primary color of the LED . The higher the gray level of the LED display , the richer the color and the more vivid the color. On the contrary, the display color is single and the change is simple. The increase of the gray level can greatly increase the color depth, so that the display level of the image color increases geometrically. The LED grayscale control level of Yunshang Optoelectronics Technology Co., Ltd. is 14bit~16bit, which makes the image level resolution details and display effects of high-end display products reach the world advanced level. With the development of hardware technology, LED gray levels will continue to develop toward higher control precision.

2, the contrast is improved

Contrast is one of the key factors affecting visual effects. Generally speaking, the higher the contrast, the clearer and more conspicuous the image, and the more vivid the color. High contrast is very helpful for the sharpness, detail, and gray level performance of the image. In some black and white texts, video display, high-contrast LED large screens have advantages in black and white contrast, clarity, integrity and so on. Contrast has a greater impact on the dynamic video display. Because the light and dark transitions in the dynamic image are faster, the higher the contrast, the easier it is for the human eye to distinguish such a conversion process.

Two main ways to improve display contrast:

(1) Improve the brightness of the LED large screen

LED display brightness is not good, in some cases, the higher the better. For example, indoor display, if the brightness is too high, it will cause light pollution, causing damage to the observer's vision.

(2) Reduce the reflectivity of the LED large screen surface

Mainly in the LED panel and LED lighting tube for special processing, reducing the reflectivity of the LED panel, thereby improving the contrast of the LED display.

3, refresh frequency

The refresh rate is the number of times the LED display content is repeated every second. The full-color display refresh rate is low, and the image will flicker, especially when shooting with video imaging equipment. Therefore, it is necessary to increase the refresh rate of the LED display as much as possible.

The refresh rate of the P8LED unit board on the cloud is 2400 Hz. The refresh rate of the display on the cloud P2LED unit board series has reached 3200 Hz. Therefore, the technical development trend of increasing the refresh frequency.

4, improve the technology of large screen uniformity

The LED display is composed of millions of tens of millions of LED pixels. Due to the discreteness of the light-emitting device itself, the bright color of the display is uneven, which seriously affects the display effect of the display. Therefore, many display manufacturers adopt No way to improve uniformity

(1) LED lighting screening

In order to overcome the discreteness of LED illumination, the early screening method is that the brightness difference and color difference of the LED light-emitting tube can be tolerated by the human eye. This method causes the device cost of the LED display to increase exponentially, and the display effect is not ideal. .

(2) Consistent correction technology

By precisely controlling the three-primary light-emitting diode of the pixel, the brightness of the pixel and the color matching relationship of the three primary colors are controlled, so that the brightness and chromaticity of all the pixels of the display are consistent. This technology can completely solve the phenomenon of uneven brightness and chromaticity of the LED display, which makes the display effect of the display screen have a qualitative leap.