OLED Cathode Height Adjustment for Specially-Shaped Border Etching
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Solution Overview
Problem
Organic light-emitting display panels with specially-shaped edges experience wire breakage of touch electrodes, leading to poor touch performance due to uneven thickness of encapsulation films and excessive etching of signal metal wires during the manufacturing process.
Innovation Solution
The organic light-emitting display panel design includes a cathode layer with a higher top end in specially-shaped border areas, an organic encapsulation layer formed by inkjet printing, and strategically placed blocking walls to maintain a consistent thickness, reducing the accumulation of etching liquid and minimizing excessive etching of signal metal wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the encapsulation film thickness is reduced in specially-shaped border areas to enable aesthetic edge designs, then the display panel achieves better appearance and space utilization, but the touch electrode wires become excessively etched and prone to breakage
Solution Approach 1:
The patent applies different encapsulation film thicknesses to different regions: the specially-shaped border areas have reduced thickness for aesthetic purposes, while the straight-line border areas maintain normal thickness to protect touch electrodes from excessive etching. This local differentiation resolves the contradiction by allowing aesthetic edge designs without compromising touch electrode reliability in critical areas.
Solution Approach 2:
The border area is segmented into two distinct regions: specially-shaped border areas with reduced encapsulation thickness for appearance, and straight-line border areas with normal encapsulation thickness for protection. This segmentation allows each region to fulfill its specific function while resolving the overall contradiction between aesthetics and reliability.
2Shape
If the encapsulation film thickness is uniformly reduced across all border areas, then the display panel achieves consistent aesthetic appearance, but the touch electrode wires experience excessive etching and wire breakage
Solution Approach 1:
Instead of uniform reduction, the patent implements local quality control by reducing encapsulation thickness only in specially-shaped border areas while maintaining normal thickness in straight-line border areas. This approach preserves manufacturing precision for touch electrodes in areas where it is critical, while still achieving aesthetic goals in appropriate regions.
3Shape
If the encapsulation film thickness varies significantly across different border areas, then the display panel achieves aesthetic specially-shaped edges, but the touch electrode width becomes inconsistent and wires break more easily
Solution Approach 1:
The patent carefully controls where thickness variation occurs, applying it only in specially-shaped border areas that do not contain touch electrodes, while maintaining uniform normal thickness in straight-line border areas where touch electrodes are located. This strategic localization of variation achieves aesthetic goals without compromising wire width consistency or reliability.
Data Source
AI summary
An organic light-emitting display panel and a display device are provided. The organic light-emitting display panel includes: a driving device film layer, an anode layer, a pixel definition layer, an organic light-emitting layer, a cathode layer, an encapsulation film layer, and a touch film layer that are sequentially stacked. The encapsulation film layer includes an organic encapsulation layer. The organic light-emitting display panel has a specially-shaped border area and a straight-line border area. In the cathode connection area, in a direction perpendicular to the organic light-emitting display panel, a top end of the cathode layer is higher in the specially-shaped border area than in the straight-line border area, and the top end of the cathode layer is an end of the cathode layer furthest away from the driving device film layer.