Flexible Display Bezel Layout to Prevent GIP Line Corrosion
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Solution Overview
Problem
Existing flexible electroluminescent display devices face corrosion defects in the gate-in-panel (GIP) line units due to the application of photo-acryl (PAC) in planarization layers, which hinders the reduction of bezel width and affects productivity.
Innovation Solution
A flexible display device design that includes a substrate with distinct areas for display and non-display, using insulating films, wiring lines, and planarization layers with partial removal and filling by polyimide (PI) based materials to address corrosion defects in GIP line units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photo-acryl (PAC) is applied as the planarization layer to improve productivity, then manufacturing efficiency is improved, but corrosion defects occur in the GIP line unit
Solution Approach 1:
The patent applies different materials to different regions: PAC is used in the bending area to maintain productivity, while PI-based material is used in the non-bending area to prevent corrosion. This local differentiation resolves the contradiction by allowing each material to perform optimally in its designated zone.
Solution Approach 2:
The planarization layer is divided into two segments with different materials: a first planarization layer (PAC) in the bending area and a second planarization layer (PI-based) in the non-bending area. This segmentation allows the patent to achieve both high productivity and corrosion prevention simultaneously.
2Area of stationary object
If the bezel area is reduced to increase display screen size, then the display-to-body ratio is improved, but the area for wiring lines and driving circuits is compromised
Solution Approach 1:
The patent utilizes the thickness dimension by applying planarization layers with different thicknesses or material properties in different regions. This allows the bezel area to be reduced while maintaining adequate space for wiring lines and driving circuits through vertical stacking and material differentiation.
Solution Approach 2:
Different regions of the bezel are assigned different materials (PAC in bending areas, PI-based in non-bending areas) to optimize both the display area reduction and the maintenance of wiring space, achieving local optimization of conflicting requirements.
3Area of stationary object
If the non-display area is bent to reduce bezel width, then the bezel area is reduced, but structural integrity and corrosion resistance are compromised
Solution Approach 1:
The patent applies PAC specifically in the bending area where flexibility is needed, while using PI-based material in the non-bending area where structural integrity and corrosion resistance are critical. This local material differentiation allows the bezel to be reduced while maintaining structural stability.
Solution Approach 2:
The patent uses a composite structure combining PAC and PI-based materials in different regions of the planarization layer. This composite approach leverages the flexibility of PAC and the corrosion resistance of PI-based material to simultaneously achieve bezel reduction and structural integrity.
Data Source
AI summary
A display device can include a substrate including a display area and a non-display area, the display area having a main area, an optical area, and a bezel area located between a center of the optical area and the main area, a plurality of light emitting elements arranged in pixel rows of the display area, the pixel rows including a first row and a second row different than the first row, and a plurality of transistors located in the bezel area, the plurality of transistors being arranged in rows corresponding to the pixel rows of the display area. Also, the display device can further include a routing structure electrically connecting at least one light emitting diode located in the first row to at least one transistor located in the second row.