Guiding Protrusions for Organic Layer Thickness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display technology, the presence of openings on substrates for cameras or sensors leads to non-uniform thickness of organic layers near these openings, affecting the packaging reliability of display panels due to the flow of organic materials in radial directions.
Innovation Solution
The use of guiding protrusions on the substrate adjacent to the opening, which are elongate, oblique, and have a height not exceeding 5 μm, helps to guide and maintain a uniform thickness of the organic layer by directing the flow of the organic material, ensuring better thickness uniformity and packaging reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an opening is provided on the substrate for camera or sensors, then the screen-to-body ratio is increased, but the organic layer thickness becomes non-uniform near the opening
Solution Approach 1:
The guiding protrusions are formed on the substrate before the organic layer is deposited. These protrusions pre-establish the geometric constraints that will guide the organic material flow during deposition, ensuring uniform thickness distribution around the opening from the outset rather than attempting to correct thickness variations afterward.
Solution Approach 2:
The guiding protrusions act as an intermediary structure between the substrate and the organic layer. They mediate the interaction by providing physical boundaries that direct the organic material flow, transforming the problematic open space into a controlled deposition environment that maintains thickness uniformity.
2Ease of manufacture
If the organic layer flows in radial directions near the opening, then the organic material distributes itself, but the thickness uniformity deteriorates and packaging reliability decreases
Solution Approach 1:
The guiding protrusions create locally differentiated zones around the opening. By positioning protrusions at specific locations adjacent to the opening, the organic material flow is locally controlled in different radial directions, preventing uncontrolled radial flow that would cause thickness variations and reliability issues.
Solution Approach 2:
The guiding protrusions are pre-formed on the substrate before organic layer deposition. This preliminary structural preparation establishes flow boundaries that control radial material distribution, ensuring that the organic layer maintains uniform thickness while still allowing necessary material flow for complete coverage.
Data Source
AI summary
The present disclosure provides a substrate, a display panel and a display device. The substrate includes a body provided with an opening, and guiding protrusions arranged on the body at a position adjacent to the opening.