OLED Display Grayscale Compensation for Color Deviation
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Solution Overview
Problem
OLED display panels suffer from uneven display brightness, leading to color deviations due to conventional compensation methods that fail to accurately handle grayscales between the 0-grayscale and the minimum calibrated grayscale, resulting in display quality issues that can be noticed by human eyes.
Innovation Solution
A display driving method that involves a first compensation manner to acquire a second grayscale, with a secondary compensation manner applied if the second grayscale is less than a critical value to achieve a third grayscale, ensuring the data voltage is determined based on the third grayscale to control sub-pixel emission and display, thereby reducing color deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional compensation methods are used to correct uneven display brightness, then brightness uniformity is improved, but color deviation occurs due to inaccurate handling of grayscales between 0-grayscale and minimum calibrated grayscale
Solution Approach 1:
The patent segments the grayscale compensation process into two distinct stages: first compensation for brightness uniformity and second compensation for color accuracy. The first compensation handles the basic mura effect, while the second compensation specifically addresses color deviation in low grayscale regions, allowing each stage to optimize for its specific goal without interfering with the other.
Solution Approach 2:
The first compensation is performed as a preliminary step to establish brightness uniformity across the display panel. This preliminary brightness correction creates a stable foundation upon which the second compensation can accurately adjust colors, ensuring that color calibration is not compromised by brightness variations.
2Illumination intensity
If first compensation manner is applied to all grayscales, then brightness uniformity is improved, but color deviation is introduced in low grayscale regions
Solution Approach 1:
The patent applies different compensation strategies to different grayscale regions. The first compensation manner is applied universally to all grayscales for brightness uniformity, while the second compensation manner is specifically applied only to low grayscale regions (first grayscale range) where color deviation occurs, making the compensation quality adaptive to local requirements.
Solution Approach 2:
The compensation system dynamically adjusts its behavior based on the input grayscale value. When the grayscale falls within the first grayscale range, both first and second compensation manners are applied. When it exceeds this range, only the first compensation manner is applied, creating a dynamic, conditional compensation process that optimizes accuracy for each region.
3Manufacturing precision
If second compensation manner is applied to all grayscales, then color accuracy is improved, but display complexity increases
Solution Approach 1:
Instead of applying the computationally intensive second compensation manner to all grayscales, the patent applies it partially only where necessary - specifically to the first grayscale range where color deviation occurs. This partial application achieves the necessary color accuracy improvement while avoiding the excessive computational complexity that would result from universal application.
Solution Approach 2:
The compensation system automatically determines which compensation manner to apply based on the input grayscale value, eliminating the need for manual configuration or complex external control logic. The system self-adjusts its compensation strategy, applying the second compensation manner only when the grayscale falls within the critical first grayscale range, thereby simplifying overall system complexity.
Data Source
AI summary
A display driving method, a display driver and a display device are provided. The display driving method includes acquiring a first grayscale of at least one to-be-displayed sub-pixel, performing a first compensation manner to compensate the first grayscale and acquire a second grayscale, determining whether the second grayscale is less than a critical value; if yes, performing a second compensation manner to compensate the second grayscale and acquire a third grayscale, and acquiring a data voltage based on the third grayscale to control the sub-pixel to emit light and display, and if no, acquiring a data voltage based on the second grayscale to control the sub-pixel to emit light and display. The problem of displaying color deviation when the display panel is displayed at a low grayscale can be avoided.