Display Driver Luminance Compensation for Edge Uniformity
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Solution Overview
Problem
Display apparatuses, such as LCD and OLED devices, face issues with luminance decrease at the edges, leading to reduced display quality and a perceived wider bezel width due to varying luminance ratios across sub-pixels.
Innovation Solution
A display apparatus and method that compensates image data by adjusting the luminance based on a decreasing luminance ratio, using equations to generate compensation image data and final image data, with specific handling for white and general unit pixels, and applying these adjustments to sub-pixels to maintain target luminance, thereby reducing luminance decrease and improving perceived bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If image data is displayed directly without compensation, then the display process is simple and fast, but luminance decreases at the edges of the display panel
Solution Approach 1:
The patent applies preliminary compensation to the image data before display. The driver compensates the image data by adjusting the grayscale values of pixels based on their positions, particularly increasing luminance for pixels at the edges of the display panel. This preliminary adjustment ensures uniform luminance across the entire display area without requiring additional hardware modifications.
2Illumination intensity
If luminance compensation is applied to all pixels, then edge luminance uniformity is improved, but processing time and computational load increase
Solution Approach 1:
The patent implements local quality compensation by applying different grayscale adjustment strategies to different regions of the display panel. Specifically, pixels at the edges (where luminance decrease occurs) receive compensation with larger grayscale adjustments, while pixels in the center region maintain their original grayscale values. This localized approach improves edge luminance uniformity without unnecessarily processing all pixels, thereby reducing computational load and processing time.
3Illumination intensity
If maximum grayscale is used for white unit pixels at the edge, then perceived bezel width is reduced, but color accuracy may be compromised
Solution Approach 1:
The patent changes the grayscale parameter dynamically based on pixel position. For white unit pixels at the edge, the driver compensates by increasing the grayscale value up to the maximum grayscale (255) to enhance luminance and reduce the perceived bezel width. For other pixels, the grayscale values are adjusted proportionally based on the decreasing ratio of luminance. This parameter change strategy maintains color accuracy by applying position-dependent adjustments rather than uniform changes across all pixels.
Data Source
AI summary
A display apparatus includes a driver which receives an input image data (RGB), generates a compensation image data (RGBD) by compensating the input image data according to an equation 1, and generates a final image data by comparing the compensation image data to a maximum grayscaleRGBD=RGB*D,whereinD=(100decreasingratioofluminance)1α,whereinαisagammavalue,anddecreasingratioofluminance=realluminancetargetluminance*100;〈equation1〉anda display panel which includes a plurality of unit pixels and displays an image based on the final image data.