Brightness Compensation for Curved Display Panels
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Solution Overview
Problem
Curved display panels experience brightness attenuation due to differing light emitting directions, leading to excessive compensation when using conventional demura technology for brightness correction.
Innovation Solution
A brightness compensation method and device that acquires original and current brightness data of pixels in curved areas, calculates a compensation coefficient based on these data, and adjusts the original brightness data to achieve target brightness levels, specifically accounting for the transmittance of cover plates in curved display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional demura technology is used for brightness compensation on curved display panels, then brightness uniformity in flat areas is improved, but excessive compensation occurs in curved areas causing brightness distortion
Solution Approach 1:
The patent applies local quality by implementing different compensation strategies for different regions of the display panel. Flat areas undergo conventional demura compensation to correct manufacturing unevenness, while curved areas use a separate compensation coefficient calculation based on light emission angle variations. This region-specific approach ensures each area receives appropriate compensation without interfering with other regions.
Solution Approach 2:
The patent segments the display panel into distinct regions (flat areas and curved areas) and processes each region independently. By dividing the compensation process into separate stages - first handling flat area demura, then calculating and applying curvature-specific compensation coefficients - the system avoids the excessive compensation that would occur if a uniform approach were applied to the entire panel.
2Illumination intensity
If brightness compensation is applied uniformly across the entire display panel, then overall brightness is improved, but curved areas experience over-compensation and loss of display quality
Solution Approach 1:
The patent implements local quality by applying different compensation methods to different regions. Flat areas receive uniform demura compensation to address manufacturing variations, while curved areas receive targeted compensation based on their specific light emission characteristics. This prevents over-compensation in curved regions while maintaining brightness improvement where needed.
Solution Approach 2:
The patent applies partial compensation by selectively treating only the curved areas with additional compensation coefficients after the global demura process. Rather than applying uniform compensation across the entire panel, the system applies partial, region-specific adjustments to curved areas to correct their brightness attenuation without affecting other regions, thereby avoiding excessive compensation.
3Device complexity
If demura compensation is performed before curvature formation, then manufacturing process complexity is reduced, but brightness attenuation in curved areas cannot be corrected
Solution Approach 1:
The patent performs preliminary demura compensation on the flat display panel before the bending process to correct manufacturing unevenness. This preliminary action simplifies the overall process by handling the bulk of brightness uniformity issues early, while leaving only the curvature-specific attenuation for a secondary compensation step applied after bending.
Solution Approach 2:
The patent maintains continuity of useful action by performing demura compensation in two continuous stages: first on the flat panel before bending, then again on the curved panel with curvature-specific coefficients. This continuous two-stage approach ensures both manufacturing efficiency and final display quality without interrupting the production flow.
Data Source
AI summary
Disclosed is a brightness compensation method and a brightness compensation device. The brightness compensation method includes: acquiring original brightness data of pixels in the curved area before forming the curved area; acquiring current brightness data of the pixels in the curved area after forming the curved area; determining a brightness compensation coefficient of the pixels in the curved area according to the original brightness data and the current brightness data; and compensating the original brightness data based on the brightness compensation coefficient to obtain target brightness data of the pixels in the curved area.