Rimless Flexible OLED Substrate Folding Design
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Solution Overview
Problem
Existing OLED display devices cannot be made truly rimless due to the requirement for side portions for electrical circuit cabling, limiting screen proportion and view effect.
Innovation Solution
A rimless display device is created using a flexible substrate with a display region and a non-display region, where the non-display region is folded and fixed on a lateral or rear surface, incorporating a hollowed-out structure for the GIP zone to allow bending without damaging cabling, and a drive circuit board assembly is placed on a rigid base plate with overlapping projections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the side portion of the array layer is used for electrical circuit cabling, then the display device can function properly, but a rim cannot be eliminated and screen proportion is limited
Solution Approach 1:
The patent moves the cabling from the traditional planar side portion to a three-dimensional folded structure. The non-display region is folded along a virtual line to form a cable assembly that extends in multiple dimensions, allowing cables to be routed through the folded substrate itself rather than requiring separate side cabling paths.
Solution Approach 2:
The cable assembly is nested within the folded non-display region of the flexible substrate. The cables are embedded inside the folded structure of the substrate itself, similar to nested dolls, eliminating the need for external cabling and enabling rimless design.
2Area of moving object
If the non-display region is folded to achieve rimless design, then screen proportion increases, but bending stress may damage the cabling
Solution Approach 1:
The non-display region is divided into multiple disconnected parts that are separated from each other. This segmentation allows each segment to be folded independently, distributing the bending stress across multiple small sections rather than concentrating it along continuous cable paths, thereby preventing cable damage.
Solution Approach 2:
The patent uses a flexible substrate with hollowed-out structures in the non-display region. These thin, flexible film structures can bend and fold without creating excessive stress concentration points, protecting the embedded cables from damage while enabling the rimless folded design.
3Shape
If the flexible substrate is folded along the boundary between display and non-display regions, then a real rimless display is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The folding lines and hollowed-out structures are pre-designed and pre-formed in the flexible substrate during manufacturing. The non-display region is prepared with predetermined fold lines and disconnected segments before final assembly, making the subsequent folding process simpler and more reliable rather than attempting complex post-assembly folding.
Data Source
AI summary
A rimless display device and a preparation method thereof, the rimless display device comprises a flexible substrate formed on a rigid base plate (1), the flexible substrate is provided with a display region (2) having an organic light-emitting layer arranged therein and a non-display region (3), wherein, after a part of the rigid base plate at a location corresponding to the non-display region (3) is removed, the non-display region (3) of the flexible substrate is fixed on a lateral surface or a rear surface of the display device after the non-display region (3) is folded. This rimless display device can achieve a real rimless display screen body, thereby further increasing the screen proportion and greatly improving the view effect.