Flexible Display Panel Spacer Geometry for Crack-Free Pad Fixing
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Solution Overview
Problem
Flexible display modules face issues with line cracks, peeling, and difficulty in fixing the flexible printed circuit when the lower frame extends into an arc surface region, particularly due to reverse bending stress.
Innovation Solution
A flexible display panel design featuring a spacer with a first side surface matching the display substrate's shape and a second side surface including planes, allowing the panel bending pad to be fixed in a planar state, reducing bending stress and preventing cracks, and ensuring secure adhesion to the spacer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the lower frame extends into an arc surface region, then the display module achieves curved edge design, but line cracks and peeling occur due to reverse bending stress
Solution Approach 1:
The spacer's second side surface is designed with a curved surface that matches the arc surface region of the display substrate. This curvature allows the panel bending pad to maintain a natural bent state without experiencing excessive reverse bending stress, thereby preventing line cracks and peeling while achieving the desired curved edge design.
Solution Approach 2:
The invention changes the geometric parameters of the spacer, specifically designing the second side surface with a curved profile rather than a flat surface. This parameter change enables the spacer to accommodate the bent state of the display substrate in the arc surface region, reducing mechanical stress and improving reliability.
2Ease of operation
If the panel bending pad is bent to fix on the spacer, then the flexible printed circuit can be secured, but difficulty in fixing occurs along the arc surface region
Solution Approach 1:
The curved surface of the spacer's second side surface is designed to match the arc surface region, allowing the panel bending pad to be fixed in a natural bent state. This eliminates the difficulty of fixing along the arc surface while ensuring secure attachment, as the curved geometry provides optimal contact and adhesion area.
3Ease of manufacture
If the spacer's second side surface is made flat, then manufacturing is simplified, but bending stress increases causing cracks
Solution Approach 1:
The spacer's second side surface is designed with a curved profile matching the arc surface region, which reduces bending stress on the panel bending pad and prevents cracks. While slightly more complex than a flat surface, the curved geometry can be efficiently manufactured using standard molding techniques, achieving a balance between manufacturing ease and structural integrity.
Data Source
AI summary
A flexible display panel, touch display module and display device are provided. The flexible display panel includes a display substrate and a spacer on a side of the display substrate away from a display side. The spacer includes a first side surface facing the display side of the display substrate and a second side surface away from the display side. The display substrate includes an arc surface region close to an edge and a panel bending pad bent to the side of the display substrate away from the display side and fixed on the second side surface of the spacer. Shape of the first side surface of the spacer is consistent with that of portion of the display substrate facing first side surface of the spacer. Portion of second side surface of the spacer corresponding to the arc surface region is a surface including a plane or multiple planes.