Flexible Display Substrate Spacer for Narrow Bezel
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Solution Overview
Problem
Display devices with flexible substrates face disconnection issues in the picture-frame area when the substrate is folded, leading to a risk of wiring line disconnection and increased picture-frame width.
Innovation Solution
Incorporating a flexible insulating substrate with a bent portion and a spacer that includes a curved area and plane areas to prevent wiring line disconnection, allowing for a narrower picture-frame while maintaining substrate flexibility and flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the substrate is folded to narrow the picture-frame area, then the picture-frame width is reduced, but the wiring lines in the picture-frame area may disconnect
Solution Approach 1:
A bent portion is pre-formed in the substrate at the picture-frame area before final assembly, creating a predetermined curvature that accommodates wiring lines. This preliminary structural preparation ensures that when the substrate is folded, the wiring lines follow the pre-defined bent path, preventing disconnection while achieving picture-frame narrowing.
Solution Approach 2:
The substrate incorporates a bent portion with a specific curvature radius in the picture-frame area. This curved structure allows the substrate to be folded without creating sharp bends that would damage wiring lines. The curvature is designed to be gentle enough to protect wiring while still achieving compact folding, thus resolving the contradiction between picture-frame area reduction and wiring line reliability.
2Reliability
If a bent portion is formed in the substrate to prevent wiring disconnection, then wiring line reliability is improved, but the substrate flatness is reduced
Solution Approach 1:
The bent portion is localized specifically to the picture-frame area of the substrate, while the display area maintains its flatness. This localized curvature approach ensures that the substrate only deviates from flatness where necessary for folding and wiring protection, preserving overall substrate quality and display area flatness while still achieving wiring line reliability through the bent portion.
3Area of stationary object
If the picture-frame area is narrowed by folding, then the device size is reduced, but the manufacturing complexity increases
Solution Approach 1:
The bent portion is formed during the substrate manufacturing process itself, rather than requiring complex post-manufacturing folding operations. This preliminary formation of the bent structure integrates the folding capability into the substrate fabrication, simplifying the overall manufacturing process while achieving picture-frame area reduction.
Data Source
AI summary
A display device includes: an insulating substrate having flexibility and including a bent portion that is bent at 90 degrees or more outside a display area provided with an image display function; and a spacer disposed inside the bent portion and including a curved area around which the bent portion is wrapped and a plane area facing the insulating substrate, wherein the insulating substrate includes a flat portion adjacent to the bent portion and provided so as to face the plane area.