OLED Display Panel Dam Structure for Touch Trace Short-Circuit Prevention
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Solution Overview
Problem
The existing OLED display panel technology faces issues with short circuits in touch traces due to residual photoresist at the lowest point of the dam structure, which affects packaging efficiency.
Innovation Solution
The display panel incorporates a multi-layer dam structure with a first and second dam area, featuring a first and second planarization layer, pixel definition layers, and support columns, where the second dam structure is a three-layer structure and the first dam structure is a four-layer structure, gradually increasing the height to reduce the level difference that the photoresist needs to cross, thereby minimizing residual photoresist and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dam structure height is increased to block organic layer flow, then packaging effect is improved, but photoresist residue at the lowest place of the dam increases causing touch trace short circuit
Solution Approach 1:
The patent divides the dam structure into multiple stepped levels instead of a single high barrier. The first dam area has a first level and the second dam area has a second level higher than the first, creating intermediate steps that reduce photoresist residue while maintaining effective blocking of the organic layer.
Solution Approach 2:
The patent introduces a vertical dimension with multiple levels (first level and second level) to the dam structure. This multi-level configuration allows photoresist to drain more effectively at each level while still achieving the required blocking height, solving the contradiction between blocking effectiveness and residue prevention.
2Reliability
If a single high dam structure is used to block organic layer, then packaging effectiveness is improved, but manufacturing complexity increases due to short circuit risks
Solution Approach 1:
The dam structure is segmented into multiple areas (first dam area and second dam area) with different levels. This segmentation simplifies the manufacturing process by reducing photoresist residue issues while maintaining packaging effectiveness, avoiding the complexity associated with single high dam structures.
Solution Approach 2:
Different regions of the dam structure have different heights tailored to local requirements. The first dam area has a first level height while the second dam area has a second level height, optimizing both packaging effectiveness and manufacturing simplicity in different locations.
Data Source
AI summary
The present application provides a display panel and a display device, including a first planarization layer, a second planarization layer, a first pixel definition layer, a second pixel definition layer, a first support column, a second support column, a first dam structure, and a second dam structure. The first dam structure is located in the first dam area, including a first planarization layer, a second planarization layer, a first pixel definition layer and a first support column. The second dam structure is located in the second dam area, including a second planarization layer, the second pixel definition layer and the second support column.