Overlapped Data Lines for Center Mura Defect in Displays
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Solution Overview
Problem
High-resolution display devices experience brightness non-uniformity (Mura) defects due to discontinuity or mismatch between top and bottom data drivers, causing a visible dividing line in the center area.
Innovation Solution
The display device employs a pixel matrix with overlapping data lines, where each pixel in the center area is connected to both a top and bottom data line with weighting factors that gradually change, allowing the top and bottom subpixels to receive proportional data voltages, thereby blurring the dividing line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If addressing is performed from both top and bottom column drivers simultaneously to achieve high resolution display, then productivity is improved, but a dividing line appears in the center area causing Mura defect
Solution Approach 1:
The patent applies local quality by differentiating the treatment of pixels in the center area from those in other areas. Specifically, pixels in the center area (where data lines overlap) are assigned different weighting factors compared to pixels in non-overlapping areas, creating a spatially varying driving scheme that eliminates the dividing line while maintaining high addressing speed
Solution Approach 2:
The patent changes the parameter of data voltage weighting dynamically based on pixel location. By adjusting the weighting factors (e.g., 0.6 for top data line and 0.4 for bottom data line in center area) according to the spatial position and data line overlap status, the system resolves the Mura defect while preserving high-resolution addressing performance
2Productivity
If data lines from top and bottom drivers are used to drive pixels, then productivity is improved, but brightness non-uniformity occurs due to discontinuity or mismatch between drivers
Solution Approach 1:
The patent implements local quality by applying different weighting strategies to different spatial regions. Pixels in the center area where data lines overlap receive blended signals with specific weighting factors, while pixels in non-overlapping areas use standard driving, thereby achieving uniform brightness across the entire display while maintaining high refresh rates
Solution Approach 2:
The patent introduces an intermediary control mechanism that blends the data signals from top and bottom drivers using weighting factors. This intermediary blending operation, particularly in the center area where both data lines overlap, acts as a mediator that harmonizes the potentially mismatched signals from both drivers, eliminating brightness non-uniformity while preserving high productivity
Data Source
AI summary
A display device using overlapped data lines to dim the Mura defect. The display device includes multiple pairs of data lines, and each pair of data lines includes a top data line and a bottom data line. The top data line and the bottom data line overlap in a center area, and each of the pixels in the center area includes two subpixels respectively connected to the corresponding top and bottom data lines. For each pixels in the center area, each of the two subpixels has a corresponding weighting factor. From top to bottom of the center area, the weighting factors of the top subpixels gradually decrease, and the weighting factors of the bottom subpixels gradually increase.