Display Panel Data Conversion for Pixel-Level Luminance Uniformity
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Solution Overview
Problem
Some areas of a display device exhibit uneven luminance, particularly at the lower end portion, due to the narrow spacing of power lines and signal lines, leading to brighter pixels in these regions.
Innovation Solution
A display device that adjusts image data based on pixel position using correction coefficients stored in a lookup table, applied through a data converter and timing controller to compensate for luminance differences, specifically by generating and applying correction coefficients to image data corresponding to pixel positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If power lines and signal lines are arranged with narrow spacing to increase pixel density, then the pixel density and resolution are improved, but the luminance uniformity deteriorates causing brighter pixels in narrow spacing regions
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple regions and assigning different correction coefficients to each region. The data converter receives position information for each pixel and selectively applies correction coefficients based on the pixel's location, thereby addressing luminance non-uniformity in a localized manner while maintaining high pixel density throughout the display.
Solution Approach 2:
The patent changes the parameter of luminance output by applying correction coefficients to the drive signals sent to pixels in different regions. The data converter modifies the drive signal parameters (voltage or current levels) based on position-dependent correction coefficients, effectively compensating for the luminance enhancement caused by narrow line spacing in specific regions.
2Illumination intensity
If correction coefficients are applied to all pixels to compensate for luminance differences, then the luminance uniformity is improved, but the data processing complexity increases
Solution Approach 1:
The patent segments the display panel into multiple regions, each with its own correction coefficient. This segmentation approach simplifies the data processing complexity by avoiding the need to handle every possible pixel position individually, while still achieving effective luminance uniformity compensation across the entire display through region-based correction.
3Illumination intensity
If the display panel structure is modified to improve luminance uniformity, then the luminance uniformity is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces potential mechanical or structural modifications with a data processing solution. Instead of physically altering the display panel structure, power line layout, or pixel arrangement to achieve luminance uniformity, the invention uses software-based correction coefficients applied through the data converter, thereby maintaining manufacturing simplicity while achieving the desired luminance uniformity.
Data Source
AI summary
A display device includes a display panel comprising a plurality of pixels, a scan driver configured to provide a scan signal to the display panel, a data driver configured to provide a data signal corresponding to each of the plurality of pixels to the display panel; a timing controller configured to control driving of the scan driver and the data driver, and a data converter configured to receive image data from the timing controller and generate the data signal from the image data based on a position of the pixel corresponding to the image data.