Display Substrate Pad Layout for Narrow-Bezel Signal Routing
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Solution Overview
Problem
Existing display technologies face challenges in achieving narrow bezels and full screens due to the large occupied space by fan-out lines and driving chips, which hinder the integration of ultra-high screen-to-body ratios and visual effects.
Innovation Solution
A display substrate design with obliquely arranged output pad groups and symmetrical fan-out lines, along with dummy pads and lines, reduces bezel width by optimizing the layout and distribution of output pads, fan-out lines, and input pads, enhancing signal symmetry and reducing signal attenuation and manufacturing issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If fan-out lines and driving chips are arranged in conventional layouts, then signal transmission is achieved, but bezel width is large and screen-to-body ratio is low
Solution Approach 1:
The patent applies oblique arrangement of output pad groups at angles (e.g., 45 degrees) relative to the display region boundaries, transitioning from conventional orthogonal layouts to diagonal configurations. This dimensional change allows fan-out lines to extend more efficiently toward the bonding region, reducing the space required in the horizontal direction and thereby narrowing the bezel width while maintaining signal transmission integrity through optimized routing paths.
Solution Approach 2:
The patent employs asymmetric layout designs where output pad groups are positioned at different locations and orientations relative to the display region. The first and second output pad groups are arranged at oblique angles, creating an asymmetric configuration that optimizes the routing paths of fan-out lines. This asymmetric arrangement allows for more efficient space utilization and reduced bezel width compared to symmetric conventional layouts, while maintaining electrical connection reliability.
2Area of stationary object
If output pad groups are arranged to reduce bezel width, then screen-to-body ratio increases, but manufacturing complexity increases
Solution Approach 1:
The patent divides the output pad structure into multiple separate output pad groups (first, second, third, and fourth groups) positioned at different oblique locations. This segmentation allows each pad group to be independently optimized for its specific routing path to the bonding region. By breaking down the conventional monolithic output pad structure into segmented groups arranged at angles, the design achieves narrower bezels while managing manufacturing complexity through modular, systematic placement of each segment.
3Area of stationary object
If fan-out lines are extended to reach bonding region, then bezel width is reduced, but line resistance increases
Solution Approach 1:
By arranging output pad groups at oblique angles and extending fan-out lines diagonally across the display substrate, the patent utilizes the diagonal dimension to shorten the effective routing distance in the horizontal direction. This dimensional change allows fan-out lines to reach the bonding region more directly, reducing the total line length required and thereby minimizing line resistance while achieving narrower bezel width.
Solution Approach 2:
The patent applies different arrangement strategies to different regions of the display substrate. Output pad groups are positioned at specific oblique locations optimized for their respective routing paths, and fan-out lines are routed through strategically selected paths that minimize resistance in critical segments. This localized optimization of line routing and pad positioning ensures that signal transmission quality is maintained while achieving reduced bezel width.
Data Source
AI summary
A display substrate, a driving chip and a display apparatus. The display substrate includes a display region, as well as a fan-out region and a bonding region sequentially arranged on a side of the display region; fan-out lines, located in the fan-out region; and output pad groups, located in the bonding region and including a first to a fourth output pad group, where the first and second output pad groups are arranged side by side in a first direction, the third output pad group obliquely extends from a side of the first output pad group away from the second output pad group in a direction facing away from the display region and forming an obtuse angle with the first output pad group.