Roller Groove PCB Segmentation for Flexible Display Crack Prevention
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Solution Overview
Problem
Flexible display devices face challenges in maintaining reliability and preventing cracks when rolling or unrolling due to the high rigidity of materials like glass substrates, which can lead to damage during winding and unwinding processes.
Innovation Solution
A display device design featuring a roller with a recessed groove for a printed circuit board, covered by a cover member and screw, and connected via flexible films to the display panel, allowing the panel to wind and unwind gently without cracking, even with high-rigidity materials like glass substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the display panel uses high-rigidity materials like glass substrates, then the strength and durability are improved, but the panel is prone to cracking during winding and unwinding processes
Solution Approach 1:
The invention divides the circuit board into multiple segments (first circuit board and second circuit board) that can be positioned at different locations relative to the roller. This segmentation allows each segment to be independently positioned to optimize stress distribution, preventing cracks in the glass substrate while maintaining electrical connections during rolling and unrolling operations.
2Reliability
If the circuit board is disposed inside the roller, then the electrical connection is maintained, but the display panel experiences high stress and cracking during winding
Solution Approach 1:
The invention applies local quality by positioning circuit board segments at specific locations - one segment inside the roller and another outside. This allows the circuit board to maintain electrical connection where needed while avoiding high-stress regions during rolling, preventing cracks in the glass substrate. The cover member also provides localized protection over the circuit board area.
3Strength
If the circuit board is disposed outside the roller, then the stress on the display panel is reduced, but the electrical connection and fixed positioning are compromised
Solution Approach 1:
The circuit board is segmented into multiple parts positioned at different locations relative to the roller. This segmentation enables one segment to maintain electrical connection inside the roller while another segment is positioned outside to reduce stress on the glass substrate during rolling operations.
4Volume of moving object
If the display panel is wound tightly around the roller, then the compactness is improved, but the glass substrate may crack due to high stress
Solution Approach 1:
The invention performs preliminary action by positioning the circuit board segments and cover member before the rolling operation begins. This pre-positioning ensures that electrical connections are established and protected in advance, allowing the display panel to be wound tightly for compact storage while maintaining reliability and preventing cracks in the glass substrate.
Data Source
AI summary
A display device includes a display panel, a roller including a groove recessed from an outer circumferential surface of the roller, and winding or unwinding the display panel, a printed circuit board disposed in the groove and electrically connected to the display panel, and a plurality of flexible films disposed between the display panel and the plurality of printed circuit boards.