Frameless Display Panel Black Matrix Sub-region Width Optimization
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Solution Overview
Problem
Liquid crystal displays face the challenge of achieving a frameless design while minimizing the impact on the aperture ratio, which is reduced by hiding the gate driver in the display area, leading to decreased light transmission areas and increased light shielding areas.
Innovation Solution
The display panel design includes a black matrix with N columns of first sub-regions and M columns of second sub-regions, where the pixel electrodes are correspondingly arranged, with specific width relationships that allow for the placement of signal lines in the second sub-regions to maintain the aperture ratio, enabling a frameless design without significant aperture ratio reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the gate driver is hidden in the display area to achieve frameless design, then the frame width is reduced, but the aperture ratio decreases due to increased light shielding areas
Solution Approach 1:
The black matrix is divided into multiple columns of sub-regions (first sub-regions and second sub-regions), and pixel electrodes are correspondingly segmented into first pixel electrodes and second pixel electrodes. This segmentation allows different regions to have different functions: first regions for normal display and second regions for signal line routing, enabling frameless design while maintaining aperture ratio.
Solution Approach 2:
Different columns of sub-regions are assigned different widths (a1 for first sub-regions, a2 for second sub-regions) to create local variations in the black matrix structure. This local quality differentiation allows signal lines to be accommodated in specific regions without uniformly reducing the aperture ratio across the entire display area.
2Adaptability or versatility
If the width of second sub-regions is increased to accommodate signal lines, then the frameless design is enabled, but the aperture ratio is reduced
Solution Approach 1:
The black matrix columns are segmented into first sub-regions and second sub-regions with different width allocations. Second sub-regions are specifically designed with appropriate widths to accommodate signal lines while first sub-regions maintain normal width for display purposes, thus enabling signal line placement without excessive aperture ratio reduction.
Solution Approach 2:
The second sub-regions serve dual functions: they provide light shielding like all black matrix regions, and simultaneously serve as dedicated channels for signal line routing. This multi-functionality allows the display to achieve frameless design with minimal impact on aperture ratio.
3Illumination intensity
If pixel electrode widths are adjusted to compensate for black matrix width variations, then the aperture ratio is maintained, but the manufacturing precision requirements increase
Solution Approach 1:
Pixel electrodes are designed with different widths corresponding to different black matrix sub-region widths. First pixel electrodes correspond to first sub-regions and second pixel electrodes correspond to second sub-regions. This local quality matching allows aperture ratio compensation while distributing the manufacturing precision requirements across different electrode types rather than requiring uniform precision across all electrodes.
Data Source
AI summary
A black matrix of the display panel comprises N columns of first sub-regions and M columns of second sub-regions, the pixel electrodes comprise N columns of first pixel electrodes in one-to-one correspondence with N columns of first sub-regions and M columns of second pixel electrodes in one-to-one correspondence with M columns of second sub-regions. A width of the M columns of second sub-regions and a width of the M columns of second pixel electrodes along the row direction of the black matrix are increased only by reducing a width of the N columns of first sub-regions along the row direction of the black matrix, such that some signal lines in the divided gate driver may be placed at the M columns of second sub-regions to enable the display panel not having frames at the left and the right, without substantially not changing the aperture ratio of the display panel.