Flexible Display Wiring Layout With Dummy Patterns in Bending Areas
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Solution Overview
Problem
Existing flexible display panels face challenges in minimizing the inactive area to achieve a narrow bezel design due to mechanical stresses and oxidation issues in the bending region, which can lead to cracking and short-circuits of wirings.
Innovation Solution
A flexible display apparatus with a substrate that includes a bending area between active and inactive regions, where wirings are formed without a separate inorganic insulating film and dummy patterns are used to prevent oxidation by maintaining a specific spacing between wirings, thereby reducing stress and oxidation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wirings are formed without a separate inorganic insulating film in the bending area, then the flexibility and bendability of the display panel are improved, but the wirings become susceptible to oxidation and mechanical damage
Solution Approach 1:
An organic insulating film is introduced as an intermediary layer between the wiring and the environment in the bending area. This organic film serves as a protective barrier that prevents oxidation of the wiring while allowing the display panel to maintain its flexibility and bendability, thus resolving the contradiction between flexibility and oxidation resistance
Solution Approach 2:
The organic insulating film creates an inert protective environment around the wiring in the bending area, shielding it from oxygen and moisture that would cause oxidation. This allows the wiring to remain protected while the overall structure maintains its flexible characteristics
2Area of stationary object
If the inactive area is reduced to achieve a narrow bezel design, then the aesthetic appearance and screen-to-bezel ratio are improved, but the density of wirings and components in the bending area increases, leading to higher stress and oxidation risk
Solution Approach 1:
Different regions of the display panel are treated with different structures: the bending area contains organic insulating films and dummy patterns for protection, while other areas use conventional designs. This localized differentiation allows the inactive area to be minimized overall while maintaining wiring durability in the high-stress bending region
Solution Approach 2:
Dummy patterns are pre-formed in the bending area alongside the wirings before final assembly. These dummy patterns preliminarily occupy space and establish a protective layout that prevents wiring crowding and reduces stress concentration, ensuring wiring durability even when the inactive area is minimized
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.