OLED Subpixel Aperture Ratio Adjustment for Color Shift Compensation
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Solution Overview
Problem
Organic Light-Emitting Diode (OLED) display devices experience color shift when viewed at different angles, particularly on curved surfaces, leading to user experience issues due to varying brightness attenuation across subpixel units.
Innovation Solution
A color shift compensation method that involves acquiring color shift information from a test display panel viewed at a specific angle and adjusting the aperture ratios of subpixel units on a target display panel to match the brightness attenuation ratios of the test panel, ensuring uniform brightness across different colors when viewed at the same angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture ratio of subpixel units is increased to improve brightness, then the brightness output is improved, but color shift increases when viewed at different angles
Solution Approach 1:
The patent applies local quality by assigning different aperture ratios to different subpixel units based on their specific color characteristics and viewing angle performance. Instead of using a uniform aperture ratio across all subpixels, the method selectively adjusts the aperture ratio of specific subpixel units (e.g., reducing the aperture ratio of red subpixels that exhibit severe color shift) to achieve optimal color consistency across the display while maintaining overall brightness.
2Manufacturing precision
If the aperture ratio is adjusted to compensate for color shift, then color consistency is improved, but brightness output decreases
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the aperture ratio parameter of individual subpixel units based on measured brightness attenuation ratios at different viewing angles. The method calculates compensation values and modifies the aperture ratio parameter selectively for each subpixel type (red, green, blue) to achieve uniform color appearance across the display while minimizing the impact on overall brightness output.
3Measurement precision
If a test display panel is used to measure color shift, then accurate color shift information is obtained, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by performing color shift measurements and aperture ratio calculations on a test display panel before mass production. The method pre-determines the optimal aperture ratios for each subpixel unit based on measured brightness attenuation characteristics, and then uses these pre-calculated values to guide the manufacturing process, thereby simplifying the actual production while maintaining high measurement precision.
Data Source
AI summary
A color shift compensation method, a display panel and a display device are provided. The color shift compensation method includes: acquiring color shift information generated with respect to a test region of a test display panel when the test region is viewed at a first viewing angle, at least a part of first subpixel units within the test region being provided with a test aperture ratio; and controlling, in accordance with the color shift information, at least a part of second subpixel units within a target region of a to-be-manufactured target display panel to be provided with a target aperture ratio being different from the test aperture ratio, to improve color shift within the target region when the target region is viewed at the first viewing angle, wherein a position of the target region on the target display panel is same as a position of the test region on the test display panel, and positions of at least the part of second subpixel units within the target region are same as positions of at least the part of first subpixel units within the test region.