Foldable Display Bending Structure to Prevent Sludge Formation
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Solution Overview
Problem
Foreign matter, such as sludge, is generated in the bending region of foldable or rollable display devices due to etching during the manufacturing process, which affects the display performance and durability.
Innovation Solution
A display device with a reinforcing member that enhances adhesion between a base substrate and a plate, including a first and second plate with a varying gap and a reinforcing member of lesser thickness and strength, to prevent sludge formation and alleviate stress in the bending region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plate is disposed on the rear surface of the base substrate to increase impact resistance, then the strength and durability of the display device is improved, but foreign matter such as sludge is generated in the bending region due to etching during the manufacturing process
Solution Approach 1:
The plate is divided into a first plate overlapping the first region and a second plate overlapping the second region, with the bending region positioned between them. This segmentation prevents the plate from spanning across the bending region, thereby eliminating the etching process that generates sludge while maintaining structural support and impact resistance through the distributed plate configuration.
Solution Approach 2:
The plate configuration is optimized locally by positioning the first and second plates to overlap specific regions (first and second regions) while deliberately excluding the bending region. This local quality approach ensures that plates are present where structural support is needed but absent where etching would generate harmful sludge, resolving the contradiction between strength improvement and sludge prevention.
2Reliability
If a reinforcing member is added to increase adhesion between the plate and base substrate, then the adhesion is improved, but the device complexity increases
Solution Approach 1:
The reinforcing member integrates multiple functions into a single component: it provides adhesion between the plate and base substrate, offers mechanical reinforcement to the bending region, and maintains the structural integrity of the display device. By combining these functions, the design improves reliability without proportionally increasing device complexity.
Solution Approach 2:
The reinforcing member serves multiple purposes simultaneously: it acts as an adhesive layer to bond the plate to the base substrate, provides structural reinforcement to prevent damage in the bending region, and maintains overall device integrity. This multi-functionality resolves the contradiction by achieving improved adhesion and reliability without requiring multiple separate components.
Data Source
AI summary
A display device includes a display panel including a base substrate and pixels. The base substrate includes first and second regions and a bending region therebetween. The pixels are on a front surface of the base substrate in the first region and are spaced apart from the second region. A drive circuit is on the second region and is electrically connected with the display panel. First and second plates are on a rear surface of the base substrate and overlap at least a portion of the first and second regions, respectively. The first plate includes a first surface facing the bending region. The second plate includes a second surface facing the bending region. A reinforcing member is on the rear surface of the base substrate and covers at least a portion of at least one of the first and second surfaces.