Flexible Display Wiring Layout With Dummy Pattern in Bending Area
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Solution Overview
Problem
The challenge in developing flexible display apparatuses is the large inactive area required for components, which increases the size and weight, and the mechanical stresses during bending can lead to cracking and oxidation of wirings, affecting reliability and aesthetics.
Innovation Solution
A flexible display apparatus with a dummy pattern between wirings in the bending area to prevent oxidation and stress, allowing for a narrower bezel design by folding the inactive area behind the active area, using a polyimide substrate without an inorganic insulating film to minimize cracking and oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the inactive area is reduced to achieve a narrower bezel, then the screen-to-bezel ratio is improved, but the components require placement in more constrained spaces making integration difficult
Solution Approach 1:
The patent moves components from the traditional planar inactive area to a folded three-dimensional configuration. The flexible substrate is folded such that the inactive area containing components is positioned behind the active display area, effectively utilizing the z-dimension to resolve the spatial conflict between reducing bezel width and accommodating components.
Solution Approach 2:
The inactive area is nested behind the active area through folding, creating a compact structure where components are housed in the folded-back region. This nesting approach allows the display apparatus to achieve a narrow bezel while maintaining all necessary components in a constrained space.
2Ease of operation
If wirings are placed in the bending area to connect components, then connectivity is achieved, but mechanical stress during bending causes cracking and oxidation of the wirings
Solution Approach 1:
A dummy pattern is introduced as an intermediary element between the functional wirings in the bending area. This dummy pattern serves as a protective mediator that absorbs mechanical stress and prevents direct stress concentration on the functional wirings, thereby preventing cracking and oxidation while maintaining connectivity.
Solution Approach 2:
The dummy pattern is placed in advance in the bending area to provide protective cushioning to the wirings before bending occurs. This pre-positioned protective structure prevents stress concentration and oxidation on the functional wirings during the bending process, ensuring their durability.
3Reliability
If an inorganic insulating film is used to protect wirings, then insulation is improved, but the film cracks during bending causing wiring failure
Solution Approach 1:
The inorganic insulating film is removed from the bending area entirely, extracting the source of the problem. By eliminating the rigid inorganic film from the flexible bending region, the patent prevents cracking while maintaining wiring protection through alternative means such as the dummy pattern and flexible substrate design.
Data Source
AI summary
A flexible display apparatus includes a flexible substrate having an active area and an inactive area, the inactive area including a first area adjacent to the active area, a second area in which a pad is disposed, and a bending area disposed between the first area and the second area, wherein a plurality of wirings extending from the second area to the first area are disposed in the bending area, and at least one dummy pattern is in between the plurality of wirings.