Flexible Display Output Wiring Load Distribution
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Solution Overview
Problem
Existing flexible and stretchable display apparatuses face challenges in minimizing the load on output wiring when stretched, leading to potential damage and reduced performance.
Innovation Solution
The display apparatus incorporates a substrate with a display area and a non-display area, featuring a peripheral island portion with driver and wiring island portions, connected by a peripheral bridge portion. The output wirings gradually increase in number and decrease in width as they approach the display area, optimizing wiring distribution and minimizing load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus is stretched to achieve flexibility and shape changeability, then adaptability and versatility are improved, but the load on output wiring increases causing potential damage and reduced reliability
Solution Approach 1:
The patent applies local quality by varying the width of output wirings at different locations. Specifically, the first output wiring has a first width and the second output wiring has a second width that is greater than the first width. This non-uniform width distribution optimizes the load-bearing capacity at different segments of the wiring path, allowing the display apparatus to withstand stretching forces while maintaining electrical connectivity.
2Reliability
If the width of output wirings is increased to handle higher load during stretching, then reliability is improved, but the area occupied by wirings in the non-display area increases
Solution Approach 1:
The patent implements local quality by strategically varying the width of output wirings only where necessary. The first output wiring has a narrower first width in regions where load is lower, while the second output wiring has a wider second width in regions subject to higher stretching loads. This localized width optimization ensures adequate mechanical strength where needed while minimizing the overall area occupied by wirings in the non-display area.
Solution Approach 2:
The patent addresses the area constraint by transitioning from a uniform two-dimensional wiring layout to a multi-dimensional solution. The output wirings are arranged in different layers or levels, with the first and second output wirings positioned at different vertical positions. This vertical dimensionality allows the wirings to overlap or be stacked, effectively reducing the planar area occupied in the non-display area while maintaining the necessary wiring widths for load-bearing capacity.
Data Source
AI summary
A display apparatus includes: a substrate including a display area and a non-display area surrounding the display area; a peripheral island portion located in the non-display area, and including a driver island portion and a wiring island portion, which are spaced apart from each other; a peripheral bridge portion located in the non-display area and connecting the driver island portion to the wiring island portion; a gate driving circuit located in the driver island portion and including a plurality of stages; a plurality of input lines located in the wiring island portion; and a plurality of output wirings connected to the gate driving circuit and extending toward the display area, wherein the number of output wirings of the plurality of output wirings and located on the peripheral bridge portion gradually increases as the output wirings of the plurality of output wirings is closer to the display area.