In the era of micro-pitch display, there are still many technical challenges to improve picture quality

As Micro-LED enters a new era, consumers have also put forward higher requirements for display image quality. How to improve display image quality has become a key research and development direction for screen companies. Since the 21st century, the evolution of LED display industry technology has not completely developed in accordance with Heitz's law.

The trend of LED display industry technology development is mainly that the chip continues to shrink and the pixel pitch continues to move downward; the cost of a single LED chip continues to decrease and the brightness continues to increase ;Continuously explore new application segments, especially the enterprise side and government side display market is ubiquitous. As an LED display manufacturer, to master the core technology of Mini/Micro-LED large-size display, there are three aspects: one is to do a good job in its own hardware products, the second is to have a control system, and the third is to be familiar with customers in the application market segment. Logic to bring LED integration to the market.

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Chip to control system, more importantly, optical correction and control system. Micro-LED is the best route, but it also faces many technical challenges: for example, 1. Chip miniaturization reduces the luminous efficiency of a single chip and increases heat generation; 2. Chip miniaturization brings about changes in the consistency of the chip's light emission under low current operation. Poor; 3. The optical crosstalk between adjacent pixels is serious; 4. The cost of chip sub-testing has risen sharply, and Micro-LED chips cannot even achieve EL testing; The dust and particles have a great impact on the light-emitting angle, and even block the light-emitting of the chip to become a "light-emitting dead pixel"; 6. The chip miniaturization brings a significant increase in pixel repair and post-service costs. For example, the COB client is almost impossible to repair, only Return to display manufacturer.

Min-LED and Micro-LED technologies have undergone profound changes. The first is high precision, the high-precision transfer and bonding technology of small-sized chips, the high-precision detection and repair technology of small-sized chips, and the fine driving and correction technology based on small current; Packaging and material technology, highly integrated display control technology; finally, precise color reproduction technology (color) for different display color gamut standards, high grayscale fine processing technology (grayscale processing) based on PQ or HLG curves of different HDR standards , Perfect moving image quality processing technology (algorithm).

In the era of micro-pitch display, how to re-understand and define the image quality? Shi Changjin believes that there should be some improvements in high grayscale, wide color gamut, high refresh, and high white consistency. For example, high grayscale + high peak brightness can achieve High dynamic range; second, wide color gamut + ultra-wide viewing angle, improving the consistency of large viewing angles; third, high refresh + high frame rate, achieving better motion graphics photo effects, high white consistency + black consistency, ensuring better The surface light source display effect.

In the era of integrated packaging, the importance of black is much higher than that of the traditional SMD era. For example, if the surface black is not handled well, the black mosaic phenomenon will be very obvious. The SMD is composed of many discrete LEDs, because the scattering of light weakens this black screen modular effect. In addition, there is reflected light that will turn the screen into a mirror. Specular reflections can seriously degrade the quality of the image when the ambient light is strong.

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Post time: Feb-27-2023

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