OLED Pixel Definition Strips for Thickness Uniformity
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Solution Overview
Problem
Existing organic light-emitting display devices face issues with uneven thickness of the organic light-emitting functional layer, leading to suboptimal display effects due to ink climbing along pixel definition layers during the curing process.
Innovation Solution
The implementation of a structure with pixel definition strips and insulation portions arranged in a specific pattern, where the organic light-emitting functional layer is formed in pixel definition grooves, using ultraviolet light to create insulation portions and sub organic light-emitting functional layers, ensuring uniform thickness and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional pixel definition layer structure is used, then the manufacturing process is simple, but the organic light-emitting functional layer thickness is uneven due to ink climbing along the pixel definition layers
Solution Approach 1:
The pixel definition layer is segmented into pixel definition strips arranged in parallel, creating pixel definition grooves between them. This segmentation prevents ink from climbing continuously along a single layer, thereby improving thickness uniformity of the organic light-emitting functional layer while maintaining a relatively simple manufacturing process
Solution Approach 2:
Insulation portions are selectively formed at specific locations within the pixel definition grooves where ink climbing occurs. These insulation portions locally modify the surface properties to prevent ink adhesion and climbing, achieving thickness uniformity without requiring complete structural redesign
2Manufacturing precision
If insulation portions are added to prevent ink climbing, then the thickness uniformity improves, but the manufacturing process becomes more complex
Solution Approach 1:
Insulation portions are formed preliminarily during the pixel definition layer formation process, before the organic light-emitting functional layer is deposited. This preliminary action prevents ink climbing issues during subsequent manufacturing steps without requiring additional complex processing steps later
Solution Approach 2:
The insulation portions act as intermediary elements between the pixel definition strips and the organic light-emitting functional layer. They mediate the interaction by providing a non-adhesive surface that prevents ink climbing, thereby improving thickness uniformity with minimal impact on the overall manufacturing process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the uniformity of the organic light-emitting functional layer thickness and improves the display effect by minimizing thickness differences between the edge and middle regions, reducing the climbing phenomenon of ink during curing.
Implementation Method 1
illuminating a first portion of the organic light-emitting functional film by ultraviolet light to form at least one insulation portion
Data Source
AI summary
An organic light-emitting display device and a manufacturing method thereof are provided by the embodiments of the present disclosure, and the organic light-emitting display device includes: a substrate; a plurality of pixel definition strips disposed on the substrate, in which the plurality of pixel definition strips are spaced apart from and arranged in parallel with each other, and two adjacent pixel definition strips among the plurality of pixel definition strips and a portion of the substrate between the two adjacent pixel definition strips constitute a pixel definition groove; and an organic light-emitting functional layer disposed in the pixel definition groove, the organic light-emitting functional layer includes a plurality of sub organic light-emitting functional layers which are insulated with each other and arranged along an extension direction of the plurality of pixel definition strips.