Bent Display Panel Edge Protection Using a Grooved Outer Layer
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Solution Overview
Problem
Mobile electronic devices with display panels are prone to damage due to impacts at the edge of the display panel when it is inserted into a housing, particularly when the display panel is bent at a preset angle, leading to potential destruction and defects in the resin layer.
Innovation Solution
A display apparatus design featuring a substrate with a bending area protected by a first protective layer inside and a second protective layer outside, where the second layer includes a groove concave toward its inner surface, and a manufacturing process using a mold with a blocking portion to form a space for resin injection, enhancing protection and reducing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is bent at a preset angle to provide various functions, then the adaptability and functionality are improved, but the edge of the display panel is susceptible to impacts and destruction
Solution Approach 1:
A protective layer is formed on the display panel before bending, extending into the bending area to provide preemptive protection against impacts that will occur during bent-state operation. The protective layer is positioned to cushion the edge of the display panel when bent, preventing destruction while maintaining the bending functionality.
2Reliability
If the protective layer is extended into the bending area to protect the display panel edge, then the reliability is improved, but the resin layer may become trapped and cause defects
Solution Approach 1:
The protective layer is designed with spatially varying properties: it extends into the bending area to provide protection, but its thickness and configuration are locally optimized to prevent resin entrapment. The protective layer covers the bending area sufficiently to protect against impacts while maintaining manufacturing quality by allowing proper resin flow and curing.
3Strength
If a thick protective layer is used to protect the display panel from impacts, then the strength is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The protective layer's thickness and extension into the bending area are optimized within specific parameter ranges to achieve the necessary impact resistance without excessive complexity. By controlling the protective layer parameters (thickness, extension distance) to fall within optimal ranges, sufficient strength is obtained while maintaining manufacturability and avoiding unnecessary structural complexity.
Data Source
AI summary
A display apparatus includes a display panel, the display panel including: a substrate including a display area, a pad area, and a bending area, wherein the display area and the pad area have a width in a first direction and a length in a second direction, and the bending area connects the display area to the pad area in the second direction and bends such that the display area faces the pad area; a first protective layer inside the bending area of the substrate; and a second protective layer on at least a portion of the edge of the substrate and outside the bending area, wherein the second protective layer includes a groove concave toward an inner surface from an outer surface of the second protective layer.