Bendable Display Stress Distribution Area Design
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Solution Overview
Problem
Bendable display devices face damage due to stress concentration at bent portions, which existing technologies have not adequately addressed.
Innovation Solution
A display device design featuring a flexible base substrate, thin film transistors, and inorganic insulation layers with a stress distribution area where the width of stress distribution is greater at the ends than at the center, reducing damage by distributing stress when the device is bent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made bendable to enable flexible applications, then adaptability is improved, but stress concentration occurs at bent portions causing damage
Solution Approach 1:
The patent applies local quality by creating a stress distribution area with specific structural characteristics (different width at ends versus center) only in the bending area, while other areas maintain their original structure. This localized structural modification allows the bending area to distribute stress effectively without compromising the overall device structure.
Solution Approach 2:
The patent segments the display device into distinct functional areas: display area, circuit area, and bending area. The bending area is further segmented into a stress distribution area with specific structural features. This segmentation allows each area to be optimized for its specific function, with the stress distribution area specifically designed to handle mechanical stress during bending.
2Reliability
If insulation layers are added to protect thin film transistors, then reliability is improved, but stress concentration worsens in bending areas
Solution Approach 1:
The patent extracts or removes the insulation layer specifically from the stress distribution area within the bending area. This selective removal eliminates the source of stress concentration (the rigid insulation layer) from the critical bending region, allowing the area to flex without damage while transistors in non-bending areas remain protected by their insulation layers.
Solution Approach 2:
The patent applies local quality by creating a stress distribution area with specific structural characteristics (different width at ends versus center) only in the bending area, while other areas maintain their original structure. This localized structural modification allows the bending area to distribute stress effectively without compromising the overall device structure.
3Reliability
If the bending area is made smaller to reduce stress, then damage resistance is improved, but adaptability for flexible applications deteriorates
Solution Approach 1:
The patent applies local quality by creating a stress distribution area with specific structural characteristics (different width at ends versus center) only in the bending area, while other areas maintain their original structure. This localized structural modification allows the bending area to distribute stress effectively without compromising the overall device structure.
Solution Approach 2:
The patent implements preliminary action by pre-designing the stress distribution area with optimized dimensions (wider ends, narrower center) before the bending operation occurs. This pre-configured structure proactively distributes stress during bending, preventing damage before it occurs rather than reacting to stress after concentration has happened.
Data Source
AI summary
A display device and a method of manufacturing the same are disclosed. In one aspect, the display device includes a display area configured to display an image and a bending area adjacent to the display area. The display device is bendable along the bending area; a flexible base substrate. A thin film transistor is disposed over the base substrate, and an insulation layer is disposed over the base substrate and covering the thin film transistor. The bending area includes a stress distribution region having opposing end portions and a central portion. Each of the opposing end portions has a width larger than the width of the central portion, and the width of each opposing end increases as a function of distance from the central portion.