Flexible Substrate Bending for Curved Display Stress Reduction
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Solution Overview
Problem
In curved display devices, stress concentration on flexible substrates can lead to damage, and the substrates' placement on the rear or side surfaces limits curvature reduction, causing tears or bonding failures and restricting the display panel's curvature.
Innovation Solution
The flexible substrate is bent and bonded between the display panel and the driving circuit board, with both sides attached closer to the cover bottom part, reducing tension and allowing the substrate to be accommodated within a panel guide part, which includes heat dissipation holes and a pad, minimizing stress and enhancing assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the flexible substrate is disposed on the rear surface or side surface of the curved device, then the device structure is simplified, but the curvature of the display panel cannot be reduced sufficiently due to stress concentration
Solution Approach 1:
The flexible substrate is repositioned from the rear/side surface to the front surface of the curved device, changing its spatial dimension. This allows the substrate to be disposed on the same curved surface as the display panel, enabling better curvature matching and reducing the minimum achievable curvature radius without compromising structural simplicity.
2Reliability
If the flexible substrate is stretched to connect the display panel and driving circuit board, then electrical connection is achieved, but the substrate may be torn or bonding may be broken due to stress concentration
Solution Approach 1:
The substrate configuration changes from a stretched flat state to a pre-bent curved state that matches the display panel's curvature. This parameter change in shape allows the substrate to connect the display panel and driving circuit board without stretching, eliminating stress concentration and preventing tears or bonding failures while maintaining reliable electrical connection.
Solution Approach 2:
The flexible substrate is pre-bent to match the curvature of the display panel before final assembly. This beforehand preparation creates a cushioning effect that absorbs potential stress during assembly and operation, preventing sudden tension spikes that could cause tearing or bonding failure.
3Ease of manufacture
If the driving circuit board is fixed perpendicularly to the side of the curved device (half folding method), then assembly is simplified, but the gap between display panel and driving circuit board increases, widening the bezel region
Solution Approach 1:
The display panel and driving circuit board are merged onto the same curved surface rather than being positioned at perpendicular angles. This merging eliminates the gap between the two components, significantly reducing the bezel region width while maintaining assembly simplicity through the common curved surface mounting structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration prevents substrate damage, reduces bezel width, and increases display panel size while minimizing stress and improving process yield by reducing tension on the flexible substrate during assembly.
Implementation Method 1
at least one flexible substrate bonded to the display panel and the driving circuit board to be bent toward an inner side of the driving circuit board
Implementation Method 2
At least one heat dissipation hole may be formed in the panel guide part to dissipate heat from the accommodating chamber
Data Source
AI summary
A display device is provided including a cover bottom part, a display panel installed on the cover bottom part, a driving circuit board disposed on one side of the display panel, and at least one flexible substrate bonded to the display panel and the driving circuit board to be bent toward an inner side of the driving circuit board.