Foldable Display Panel Dummy-Line Layout for Bend Short Prevention
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Solution Overview
Problem
Existing display devices face challenges in reducing the non-display area while maintaining reliability, particularly due to residual metal films causing short circuits at bending areas.
Innovation Solution
The display device incorporates a first dummy line monolithically connected to a power line, extending along the bending area, and a second dummy line spaced apart from the first, with an organic film covering both, preventing residual metal films at boundaries and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area is reduced by bending the display panel, then the area efficiency is improved, but residual metal films may remain at the bending boundaries causing short circuits
Solution Approach 1:
The dummy lines are formed in advance during the manufacturing process, extending from the power lines through the bending area to the other non-display area. This preliminary structure prevents residual metal film accumulation at the bending boundaries before the actual bending operation occurs, thereby preventing short circuits while maintaining the reduced non-display area design
Solution Approach 2:
The dummy lines act as intermediary structures that bridge the power lines across the bending area. These intermediate conductive paths provide a controlled route for metal deposition, preventing uncontrolled residual metal film formation at the bending boundaries while maintaining electrical connectivity through the bent region
2Reliability
If dummy lines are added to prevent short circuits, then reliability is improved, but device complexity increases
Solution Approach 1:
The dummy lines are merged with the existing power line structure, extending continuously from the power lines through the bending area. This integration approach allows the dummy lines to perform multiple functions (electrical connection and short circuit prevention) without requiring separate independent structures, thereby minimizing the increase in device complexity while improving reliability
Data Source
AI summary
A display device includes: a substrate including a display area, a first non-display area, a second non-display area, and a bending area and extending in a second direction, a first inorganic film disposed in the display area, the first non-display area, the second non-display area and a portion of the bending area on the substrate, a second inorganic film disposed on the first inorganic film and overlapping the display area, the first non-display area, and the second non-display area in a plan view, a first power line disposed on the second inorganic film and overlapping the first non-display area in a plan view, and a first dummy line extending from the first power line, disposed on the first inorganic film in the bending area, covering a first side surface of the second inorganic film in the first non-display area, and extending in the second direction.