Flexible Display Substrate With Grooved Transistor Shielding
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Solution Overview
Problem
Rigid transparent display screens are difficult to bend, limiting their application range and external ambient light affects the operating performance of transistors in pixel driving circuits, degrading display quality.
Innovation Solution
A flexible display substrate with a light-transmitting substrate featuring grooves and a light-shielding layer, where the active layer of transistors is positioned within the grooves, and a light-shielding pattern covers the groove walls and bottom, reducing light exposure and enhancing flexibility and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rigid transparent display screen is used, then the display structure is stable, but the display screen cannot be bent, limiting application range
Solution Approach 1:
The patent replaces the traditional rigid glass substrate with a flexible substrate that can be bent or folded, enabling the display screen to adapt to various application scenarios such as wearable devices and flexible displays while maintaining display functionality
Solution Approach 2:
The patent introduces a three-dimensional groove structure into the substrate to position transistors below the substrate surface, creating vertical separation between the flexible display surface and the electronic components, thus enabling both flexibility and stable transistor operation
2Reliability
If transistors are positioned on the substrate surface, then the pixel driving circuit is simple, but external ambient light affects carrier mobility, degrading display quality
Solution Approach 1:
The patent moves transistors from the two-dimensional substrate surface to a three-dimensional position within grooves below the substrate surface. This vertical relocation shields transistors from external ambient light, preventing light-induced carrier generation that would degrade display quality, while the groove structure provides the necessary protection without excessive complexity
Solution Approach 2:
The patent embeds transistors within groove structures that are integrated into the substrate itself, creating a nested configuration where the substrate contains protective grooves that in turn contain the transistors, providing efficient space utilization and protection
3Adaptability or versatility
If a flexible substrate is used, then the display can be bent and application range expands, but light transmittance may be reduced
Solution Approach 1:
The patent applies different properties to different regions: the substrate material itself maintains high transparency for light transmission, while localized groove structures provide light shielding for transistors. This spatial differentiation allows the display to be both flexible and maintain high light transmittance where needed
Data Source
AI summary
A display substrate includes: a flexible light-transmitting substrate; a light-shielding layer disposed on a side of the flexible light-transmitting substrate; and a plurality of sub-pixels disposed on a side of the light-shielding layer away from the flexible light-transmitting substrate. The side of the flexible light-transmitting substrate has grooves. The light-shielding layer includes a plurality of light-shielding patterns, and a light-shielding pattern is located in a groove. The light-shielding pattern includes a first sub-light-shielding pattern covering a side wall of the groove and a second sub-light-shielding pattern covering a bottom surface of the groove. Each sub-pixel includes a pixel driving to circuit including a plurality of transistors. An active layer of a transistor is located in the groove. Relative to the flexible light-transmitting substrate, a surface of the active layer proximate to the flexible light-transmitting substrate is lower than a surface of the first sub-light-shielding pattern away from the flexible light-transmitting substrate.