Luminance Correction System for Display Panel Uniformity
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Solution Overview
Problem
Luminance variations between pixels in display panels lead to reduced image quality due to the generation of luminance spots, which existing techniques fail to adequately address.
Innovation Solution
A luminance correction system that includes an image pickup device to generate pickup data, a parameter calculation device to determine correction parameters for adjusting the gamma voltage, and a display device to compensate the input grayscale of sub-pixels, ensuring uniformity by adjusting the target luminance and gamma voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing luminance correction techniques are used, then luminance variations can be partially addressed, but luminance spots still occur and image quality is reduced
Solution Approach 1:
The patent applies preliminary action by pre-calculating correction parameters for each grayscale level before actual display operation. The system stores correction values in advance that compensate for luminance variations, so when display occurs, the correction is already in place preventing luminance spots from forming in the first place
Solution Approach 2:
The patent changes parameters by adjusting the luminance correction values across different grayscale levels. Specifically, it modifies the correction parameters to account for the non-linear relationship between grayscale and luminance, ensuring that each grayscale level produces the intended luminance output without creating spots
2Measurement precision
If the system corrects luminance for all pixels uniformly, then some luminance variations are reduced, but high-grayscale areas lose compensation margin and luminance degradation occurs
Solution Approach 1:
The patent applies local quality by implementing different correction strategies for different grayscale ranges. It specifically addresses high-grayscale areas with targeted compensation margins, allowing uniform luminance correction in mid-range grayscales while preserving luminance intensity and compensation capability in high-grayscale regions
3Illumination intensity
If the system increases compensation margin in high-grayscale areas, then luminance degradation is prevented, but overall luminance uniformity across the display panel deteriorates
Solution Approach 1:
The patent applies dynamics by making the correction parameters adaptive rather than static. The system dynamically adjusts correction values based on the input grayscale level, applying stronger correction where needed (high-grayscale areas) and maintaining appropriate correction elsewhere, thus achieving both luminance stability and overall uniformity through dynamic parameter adjustment
Data Source
AI summary
A luminance correction system includes an image pickup device configured to pick up a test image and generate pickup data, a parameter calculation device configured to calculate a first target luminance that is a maximum luminance of a reference area in a display panel and a detected maximum luminance that is a luminance of a correction target sub-pixel based on the pickup data with respect to a maximum grayscale, determine a second target luminance by correcting the first target luminance, and calculate correction parameters, and a display device including the display panel, the display device configured to compensate the input grayscale of the correction target sub-pixel to a target grayscale based on the correction parameters and generate a data voltage by adjusting upward a gamma voltage corresponding to the target grayscale.