Flexible Display Bezel Bending Structure for Peeling Prevention
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Solution Overview
Problem
Existing display devices face limitations in reducing bezel width due to the presence of wiring and driving circuits in the non-display area, which hinders the reduction of the bezel area while maintaining display performance, especially in flexible electroluminescent display devices.
Innovation Solution
A flexible display device with a bezel bending structure that includes a display panel, a bending area with a curvature, a first and second back plate, a cushion tape, and a fixing tape with an adhesive layer to secure the bending area, minimizing peeling and enhancing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the non-display area is used to arrange wiring and driving circuits, then the display device can function properly, but the bezel width cannot be reduced
Solution Approach 1:
The patent applies dimensionality change by bending the non-display area of the flexible substrate into a curved configuration. This transforms the traditional planar arrangement into a three-dimensional structure, allowing wiring and driving circuits to be arranged along the curved surface rather than occupying horizontal bezel space. The bending area enables the non-display area to wrap around the display area, effectively utilizing vertical and depth dimensions to reduce the visible bezel width while maintaining all necessary circuit arrangements.
Solution Approach 2:
The patent implements nesting by positioning the bent non-display area such that it overlaps with itself in the vertical direction. The wiring and driving circuits arranged in the bending area are nested within the overall structure, with the non-display area effectively folding back onto itself. This nested configuration allows the circuits to be housed within the curved profile rather than extending outward as a flat bezel, reducing the visible frame width.
2Area of stationary object
If the non-display area is bent to reduce bezel width, then the aesthetic quality improves, but peeling may occur in the bending area
Solution Approach 1:
The patent applies beforehand cushioning by introducing a cushioning layer specifically in the bending area where peeling is most likely to occur. This cushioning layer acts as a buffer that absorbs and distributes the mechanical stress generated during bending, preventing the force from concentrating at the adhesive interfaces. By placing this protective layer in advance at the critical bending location, the patent prevents peeling before it can occur, maintaining adhesion stability throughout the device's operational lifetime.
Solution Approach 2:
The patent employs composite materials by combining multiple layers with different mechanical properties in the bending area. The structure includes the flexible substrate, cushioning layer, insulating layer, and wiring, each with distinct characteristics. The cushioning layer, positioned between the flexible substrate and other components, provides a composite structure that balances flexibility and structural integrity. This multi-layer composite approach allows the bending area to deform smoothly while maintaining strong adhesion between all layers.
3Reliability
If a protective layer is added to prevent peeling, then adhesion stability improves, but device complexity increases
Solution Approach 1:
The cushioning layer serves multiple functions simultaneously: it acts as a protective layer preventing peeling, provides mechanical cushioning in the bending area, and maintains the structural integrity of the flexible substrate. By designing this single layer to fulfill multiple roles, the patent avoids the need for separate protective, cushioning, and structural components, thereby reducing overall device complexity while still achieving reliable adhesion stability.
Data Source
AI summary
A flexible display device may include a cover glass, a light shielding pattern on a lower surface of the cover glass, a display panel under the cover glass and including a display area and a non-display area including a bending area, a plurality of touch sensors disposed at a position corresponding to the display area of the display panel below the cover glass, an adhesive layer between the cover glass and the display panel, a micro coating layer on an upper surface of the display panel in the bending area; and a thin film transistor disposed in the display panel in the display area and including an oxide semiconductor.