Display Panel Subpixel Shutdown for Brightness Uniformity
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Solution Overview
Problem
Display panels suffer from poor display uniformity due to voltage offset of driving transistor threshold, color crosstalk of light emitting units, and performance variation of light emitting units, leading to issues such as uneven brightness and color deviation.
Innovation Solution
A driving method for display panels that involves turning off a portion of non-zero grayscale sub-pixel units based on initial image data to adjust brightness and color uniformity by dividing the display panel into sub-regions and using threshold voltage adjustments to determine which sub-pixels to turn off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If all sub-pixel units are driven uniformly, then the driving circuit is simple, but display uniformity is poor due to threshold voltage offset and performance variation
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple sub-regions and applying different grayscale adjustments to different sub-regions based on their specific threshold voltage characteristics. Each sub-region receives customized driving parameters to compensate for local variations in transistor performance, thereby improving overall display uniformity without requiring complete redesign of the driving circuit architecture.
Solution Approach 2:
The patent segments the display panel into multiple sub-regions and processes each region independently with region-specific grayscale compensation. This segmentation allows the system to address local uniformity issues in each sub-region while maintaining a relatively simple overall driving circuit structure, resolving the contradiction between precision and complexity.
2Manufacturing precision
If grayscale data is adjusted for each sub-region, then display uniformity is improved, but processing time and complexity increase
Solution Approach 1:
The patent performs preliminary measurement and characterization of threshold voltages for driving transistors in different sub-regions during the manufacturing or initialization phase. This preliminary action allows the system to store pre-calibrated grayscale compensation data for each sub-region, eliminating the need for real-time complex calculations during normal operation and thus reducing processing time while maintaining brightness uniformity.
3Manufacturing precision
If threshold voltage measurement and compensation is implemented, then color deviation is reduced, but system complexity and measurement requirements increase
Solution Approach 1:
The patent implements a self-service approach where the display panel system automatically performs threshold voltage measurement, sub-region identification, and grayscale compensation without requiring external measurement equipment or complex external control systems. The driving circuit itself conducts the necessary measurements and applies compensation, thereby reducing external system complexity while achieving color uniformity across different sub-regions.
Data Source
AI summary
A display panel, a driving method thereof, and a display apparatus are provided. The driving method includes: acquiring initial image data; and initiating a uniformity adjustment manner, wherein the uniformity adjustment manner comprises: turning off at least a portion of non-zero grayscale sub-pixel units in the display panel based on the initial image data.