OLED Pixel Layout for Blue Sub-Pixel Lifespan Matching
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Solution Overview
Problem
Existing OLED display panels have a shorter light-emitting lifespan due to the low light-emitting rate of blue sub-pixels, which affects the overall display effect and product lifespan.
Innovation Solution
The display panel design includes a pixel unit with a first and second sub-pixel sequentially arranged along a direction, and a third sub-pixel with the shortest light-emitting lifespan positioned on both sides of their area, increasing the third sub-pixel's pixel area ratio to reduce current density and decay speed, matching its lifespan with the first and second sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the area ratios of red, green, and blue sub-pixels are made similar, then the manufacturing process is simplified, but the light-emitting rate and service lifespan are reduced due to the inherently low light-emitting rate of blue sub-pixels
Solution Approach 1:
The patent applies asymmetry by making the area ratio of blue sub-pixels larger than that of red and green sub-pixels. Specifically, the blue sub-pixel area ratio is set to 30-50%, while red and green sub-pixels are set to 20-35% each. This asymmetric design compensates for the lower light-emitting efficiency of blue sub-pixels, ensuring that all sub-pixels have comparable light-emitting rates and service lifespans, thereby improving overall display reliability without complicating the manufacturing process
2Reliability
If the area ratio of blue sub-pixel is increased to compensate for its low light-emitting rate, then the service lifespan is improved, but the pixel structure becomes more complex
Solution Approach 1:
The patent applies local quality by optimizing the area ratio of each sub-pixel according to its specific light-emitting characteristics. The blue sub-pixel is given a larger area ratio (30-50%) compared to red and green sub-pixels (20-35% each), creating non-uniform local properties across the pixel. This local optimization ensures that each sub-pixel contributes equally to the overall light-emitting rate and service lifespan, improving reliability without requiring complex additional structures
Data Source
AI summary
A display panel and a display device are provided in embodiments of the present application. The display panel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different light-emitting colors. The first sub-pixel and the second sub-pixel are sequentially arranged along a first direction. The third sub-pixel is arranged on at least two sides of an area where the first sub-pixel and the second sub-pixel are located. The third sub-pixel is a sub-pixel with a shortest light-emitting lifespan in the pixel unit. Such design can make a pixel area ratio of the third sub-pixel be increased in a unit pixel area, reducing a current density of the third sub-pixel and reducing its decay speed, so that the lifespan of the third sub-pixel matches with lifespan of the first sub-pixel or the second sub-pixel.