Flexible Display Cover Layer Design for Zero Bezel and Strain Reduction
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Solution Overview
Problem
Flexible display apparatuses face issues with increased strain during bending, leading to peeling of light emitting device layers and short-circuiting of thin film transistors, and multi-screen displays have visible boundaries due to bezel areas, reducing image immersion.
Innovation Solution
A display apparatus with a first substrate featuring a bending part in a curve shape, a pixel array layer, and a cover layer in the non-active area except where the bending part overlaps, allowing for easy bending and minimizing bezel width, and a multi-screen display apparatus with adjacent screen modules having closely adhered side surfaces to eliminate boundary portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the degree of bending is increased to reduce bezel size, then the bezel size is reduced, but the outermost strain and internal strain of the panel increase, causing the light emitting device layer to peel off and thin film transistors to short-circuit
Solution Approach 1:
The patent divides the substrate into distinct functional zones: a first substrate containing the active display area and bending part, and a second substrate containing the non-active area. This segmentation allows the bending part to be isolated from critical components, enabling high-degree bending without damaging the light emitting device layer or thin film transistors while achieving zero bezel size.
2Strength
If a cover layer is provided in the entire non-active area to protect the side surface, then the side surface is protected, but the strain on the panel during bending increases, causing damage to the light emitting device layer and thin film transistors
Solution Approach 1:
The cover layer is selectively applied only to specific regions of the non-active area where side surface protection is needed, while intentionally leaving the bending part area uncovered. This local quality approach provides protection where required without imposing the harmful effects of a complete cover layer, thus preventing strain-induced damage during bending.
3Area of stationary object
If multi-screen display apparatuses are arranged in a lattice type to create large display screens, then large display area is achieved, but boundary portions between display apparatuses create a sense of discontinuity, reducing image immersion
Solution Approach 1:
The patent extracts and removes the boundary portions between adjacent display apparatuses by designing the bending part to curve toward the non-active area, causing the active area of one display to visually merge with the active area of the adjacent display. This extraction of boundary elements creates a seamless multi-screen display with enhanced visual continuity and immersion.
Data Source
AI summary
A display apparatus can includes a first substrate including an active area, a non-active area surrounding the active area, and a bending part bent in a curve shape; a pixel array layer disposed in the active area of the first substrate; a second substrate disposed on the pixel array layer in which the pixel array layer is between the first substrate and the second substrate; and a cover layer disposed in the non-active area of the first substrate, the cover layer covering a side surface of the second substrate, in which the cover layer is disposed in a remaining portion of the non-active area except for an area of the non-active area that overlaps with the bending part.