Flexible Display Wiring Layout to Prevent Bending-Induced Cracks
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Solution Overview
Problem
Flexible display devices face challenges in narrowing their frame area due to the cracking of inorganic insulating films when bent, which can lead to broken wiring and reduced reliability.
Innovation Solution
The display device incorporates a flexible substrate with a first organic film and a second organic film, where the connection wiring is located between these films, thereby reducing the direct contact with inorganic insulating films and minimizing the risk of cracking and wiring breaks during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic electrically insulating film is disposed on the entire surface of the flexible substrate to prevent moisture entry, then moisture resistance is improved, but the film cracks when bent due to higher resistance to bending stress
Solution Approach 1:
The patent applies different types of insulating films to different regions of the flexible substrate. Specifically, an inorganic insulating film is applied only to the non-bending area (frame region) where moisture protection is needed, while the bending area uses only an organic insulating film that can flex without cracking. This local differentiation resolves the contradiction by providing moisture resistance where needed without compromising bendability where required.
2Area of stationary object
If the frame area is bent to narrow the frame and enlarge the display area, then the display area is increased, but the inorganic insulating film cracks under bending stress
Solution Approach 1:
The patent differentiates the insulating film structure between the bending area (display region) and non-bending area (frame region). The bending area uses only flexible organic insulating films that can accommodate curvature, while the frame region uses inorganic insulating films for moisture protection. This allows the frame to be bent for narrowing without causing cracks in the insulating film.
Data Source
AI summary
According to one embodiment, a display device comprises a flexible substrate, a first insulating film disposed on the flexible substrate, a switching element disposed on the first insulating film, a signal wiring electrically connected with the switching element, a first organic film disposed on the signal wiring, a connection wiring disposed on the first organic film, a second organic film disposed on the connection wiring and a pad electrode disposed on the second organic film. The connection wiring is located between the first organic film and the second organic film and is in contact with the first organic film and the second organic film.