Display Pixel Layout With Alternating Sub-Pixels for Aging Control
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Solution Overview
Problem
Display devices with single sub-pixels for expressing a color can deteriorate image quality when the sub-pixel expires, leading to reduced image quality over time.
Innovation Solution
A pixel configuration with multiple sub-pixels of different colors, alternating their driving periods within a frame to maintain consistent luminance and extend the display's lifespan, controlled by a main controller using aging data and a lookup table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sub-pixel for expressing one color is disposed in the pixel, then the device complexity is reduced, but the image quality deteriorates when the sub-pixel expires
Solution Approach 1:
The pixel is divided into multiple sub-pixels (first sub-pixels, second sub-pixels, and third sub-pixels) with different colors. Each sub-pixel can be independently driven and replaced, so when one sub-pixel expires, the others can continue to function or be activated through aging management, maintaining image quality over time.
Solution Approach 2:
The patent implements aging management by changing the driving parameters of sub-pixels based on their age. The controller selectively drives different sub-pixels based on their expiration ages, extending the overall operational life of the pixel while maintaining display quality.
2Reliability
If multiple sub-pixels of different colors are used, then the image quality and operational time are improved, but the device complexity increases
Solution Approach 1:
The pixel is segmented into multiple functional sub-pixels with different colors (first, second, and third sub-pixels). Each sub-pixel has a specific color characteristic and can be independently controlled, allowing the system to maintain image quality by activating appropriate sub-pixels based on their aging states.
Solution Approach 2:
The pixel structure is designed with multi-functional sub-pixels that can serve different colors and aging stages. The same physical pixel structure supports multiple functions through its sub-pixels, which can be selectively activated based on their operational age and color requirements.
3Stability of the object's composition
If sub-pixels are driven continuously, then the luminance may fluctuate due to aging, but alternating driving periods maintains consistent luminance
Solution Approach 1:
The patent implements periodic alternating driving of different sub-pixel groups. First sub-pixels are driven during a first period, then switched to second sub-pixels during a second period, and so on. This periodic action distributes the driving load over time, preventing any single sub-pixel from continuous operation and maintaining luminance consistency through age-based selection.
Solution Approach 2:
The aging management system ensures continuous useful action by continuously selecting and driving sub-pixels that are still within their operational lifespan. By constantly switching between sub-pixels based on their aging states, the system maintains continuous display functionality while extending the overall operational duration of the pixel.
Data Source
AI summary
A pixel includes: first sub-pixels including a (1_1)th sub-pixel and a (1_2)th sub-pixel; second sub-pixels including a (2_1)th sub-pixel and a (2_2)th sub-pixel, and to emit light of a color different from that of the first sub-pixels; and a third sub-pixel to emit light of a color different from that of each of the first sub-pixels and the second sub-pixels. The (1_1)th sub-pixel and the (2_1)th sub-pixel are to be driven during a first period, and not driven during a second period. The (1_2)th sub-pixel and the (2_2)th sub-pixel are to be driven during the second period, and not driven during the first period.