Curved Display Substrate Edge Structure for Lower Bending Stress
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Solution Overview
Problem
Current curved display devices face challenges in manufacturing, particularly in achieving uniform thickness and surface height variations along the edges, which affect the bending process and overall structural integrity.
Innovation Solution
The display device features a design with upper and lower substrates having protruding and recessed regions along the edges, allowing for different thicknesses and surface heights, including specific configurations like 1-1, 1-2, 3, and 4 protruding regions, to accommodate flexible films and circuit boards, enabling double etching and reduced bending stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the display device is manufactured with uniform thickness, then the manufacturing process is simplified, but bending stress increases during curvature formation
Solution Approach 1:
The patent applies local quality by creating non-uniform thickness distribution in the display device. Specifically, the edge region is designed with reduced thickness compared to the center region, allowing the edge to be more flexible and better withstand bending stresses during curvature formation, while the thicker center maintains structural integrity.
2Adaptability or versatility
If the edge thickness is reduced to accommodate flexible films, then adaptability improves, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent segments the display device into distinct regions with different thickness characteristics: a center region with greater thickness and an edge region with reduced thickness. This segmentation is achieved through controlled etching processes that create specific thickness profiles in different areas, allowing the edge to accommodate flexible films while maintaining overall manufacturing precision through defined geometric parameters.
3Stability of the object's composition
If double etching is performed to create varying thicknesses, then structural integrity improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by performing the double etching process during the manufacturing stage to pre-establish the desired non-uniform thickness profile. The first etching creates an initial thickness reduction at the edges, and the second etching further refines the thickness distribution. This preliminary structuring ensures optimal bending stress distribution and structural integrity before the device is assembled and put into service.
Data Source
AI summary
Provided is a display device. The display device includes an upper substrate; and a lower substrate disposed on a lower portion of the upper substrate and including an outer region extending outward from the upper substrate at one side, wherein each of the upper substrate and the lower substrate includes a protruding region extending along an edge of each of the upper substrate and the lower substrate, and a recessed region surrounded by the protruding region in a plan view and having a thickness smaller than that of the protruding region, wherein the protruding region includes a first protruding region that is adjacent to the outer region and extends in a first direction, a second protruding region that extends in the first direction and is positioned opposite to the first protruding region, a third protruding region that extends in a second direction intersecting the first direction and connects the first protruding region and the second protruding region, and a fourth protruding region that extends in the second direction and is positioned opposite to the third protruding region, wherein the first protruding region includes a 1-1 protruding region, and the 1-1 protruding region includes a 1-1-1 protruding region and a 1-1-2 protruding region disposed between the 1-1-1 protruding region and the recessed region and having a thickness between a thickness of the 1-1-1 protruding region and the thickness of the recessed region.