Flexible Display Backplane Substrate with Embedded Drivers
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Solution Overview
Problem
Conventional flexible displays are prone to damage and pixel failure due to repeated folding, especially at gate driver regions where wires and circuits are concentrated, leading to cracks and broken connections.
Innovation Solution
A flexible display device with a backplane substrate featuring a defined folding axis and area where the radius of curvature remains constant, with gate drivers and data drivers embedded in the non-display area and linked to the active area via wires, avoiding overlap with the folding line to distribute stress and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gate drivers are embedded in the edge of the active area, then wiring and circuits can be concentrated in the gate driver regions, but the folding stress resistance decreases and cracks may occur
Solution Approach 1:
The gate drivers are extracted from the edge region adjacent to the active area and relocated to the non-display area. This separation removes the vulnerable wiring and circuit concentration from the high-stress folding region, thereby improving folding stress resistance while maintaining functional integration through link wires.
2Reliability
If wires and circuits are concentrated in the gate driver regions at the edge, then electrical connection is achieved, but the resistance to folding stress decreases and wires may break
Solution Approach 1:
The gate drivers are relocated from a two-dimensional edge position to the non-display area, utilizing the available space in a different spatial dimension. This repositioning allows electrical connections to be maintained through link wires while removing the vulnerable concentrated wiring from the high-stress folding region.
3Adaptability or versatility
If the flexible display is repeatedly folded, then flexibility is demonstrated, but cracks occur and pixels may fail to turn on
Solution Approach 1:
The gate drivers and their concentrated wiring are extracted from the folding stress region, isolating the vulnerable electrical connections from the repeated folding mechanism. This allows the display to maintain folding flexibility while protecting the pixel control circuits from stress-induced failures.
Data Source
AI summary
Disclosed is a flexible display device that includes a backplane substrate having an active area and a non-display area outside the display area, the active area having a plurality of pixels defined with a plurality of gate lines and a plurality of data lines, wherein the backplane substrate is defined with a folding axis with reference to which the display device is folded or bended and a folding area in which a radius of curvature remains substantially the same as a radius of curvature at the folding axis located at a center of the folding area when the display device is folded or bended; a plurality of embedded drivers on the backplane substrate in the non-display area, wherein two of the embedded drivers are spaced apart from each other outside the folding area with the folding area therebetween; and a plurality of link wires between the plurality of embedded drivers and the active area, electrically connecting the plurality of embedded drivers and one of the plurality of gate lines and the plurality of data lines.