OLED Display Panel Isolation Structure Design for Reliability
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Solution Overview
Problem
The reliability of display panels, particularly those using Organic Light Emitting Diode (OLED) technology, needs to be improved due to issues with display failure and reduced product yield during manufacturing.
Innovation Solution
A display panel design that includes a substrate, an isolation structure forming multiple openings, and a light-emitting function layer with varying thicknesses of light-emitting structures. The design also features encapsulation layers with specific gaps to protect the light-emitting structures and prevent damage during patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-emitting structures with different thicknesses are formed using conventional sequential patterning, then manufacturing complexity increases, but display failure occurs due to damage to previously formed encapsulation portions
Solution Approach 1:
The isolation structure is divided into a first portion and a second portion with different heights, where the first portion corresponds to first openings and the second portion corresponds to second openings. This segmentation allows different light-emitting structures of varying thicknesses to be formed independently without interfering with each other, preventing damage to previously formed encapsulation portions while maintaining manufacturing feasibility
Solution Approach 2:
The isolation structure extends in the vertical dimension with varying heights (first portion and second portion at different levels). This dimensional variation creates separate protective barriers for light-emitting structures of different thicknesses, allowing sequential formation without cross-interference and eliminating the need for complex re-patterning processes
2Manufacturing precision
If uniform isolation structure height is used, then manufacturing process is simpler, but light-emitting structures with different thickness requirements cannot be properly protected
Solution Approach 1:
The isolation structure exhibits local quality variation with the first portion having a specific height for protecting thinner light-emitting structures in first openings, and the second portion having a different height for protecting thicker light-emitting structures in second openings. This localized differentiation ensures each region provides appropriate protection for its corresponding light-emitting structure without requiring complex overall restructuring
Data Source
AI summary
A display panel, a display device and a method of manufacturing a display panel. The display panel includes a substrate, an isolation structure and a light-emitting function layer. The light-emitting function layer includes a first light-emitting structure and a second light-emitting structure. A thickness of the second light-emitting structure is larger than that of the first light-emitting structure in a thickness direction. The isolation structure includes a first portion and a second portion. An orthographic projection of the first portion on the substrate is located within an orthographic projection of the second portion on the substrate. A length of a portion of the second portion protruding from the first portion towards a side facing the first opening is L1, a length of a portion of the second portion protruding from the first portion towards a side facing the second opening is L2, and L1<L2.