Grooved Pixel Defining Layer for Impact Stress Release
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Solution Overview
Problem
OLED display panels are prone to display defects such as dark spots, bright spots, and colored spots when bent or subjected to falling impacts due to stress concentration and lack of flexural strength, which existing buffer layers cannot adequately address without increasing thickness and manufacturing complexity.
Innovation Solution
A display substrate with a pixel defining layer featuring grooves that surround sub-pixel areas, allowing stress release and reducing expansion, thereby enhancing the panel's ability to withstand impacts and improve flexibility without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the active area and thickness of OLED display panel are increased to meet visual and tactile requirements, then the visual experience and tactile experience are improved, but the strength for bearing falling impacts and flexural strength deteriorate
Solution Approach 1:
The pixel defining layer is segmented by introducing grooves that divide the layer into multiple regions. These grooves act as stress release channels, allowing the layer to flex and bend without generating excessive stress that would cause display defects. This segmentation maintains structural integrity while enabling flexibility and impact resistance.
Solution Approach 2:
The pixel defining layer incorporates a groove structure that creates a porous-like configuration. This groove-based porous structure provides stress release pathways, allowing the layer to accommodate bending and impact forces without compromising the underlying OLED devices, thereby improving flexural strength and impact resistance.
2Strength
If buffer layers are added to improve impact resistance, then the strength for bearing falling impacts is improved, but the thickness and manufacturing complexity increase
Solution Approach 1:
The pixel defining layer is given multiple functions: it defines pixel boundaries, protects OLED devices, and provides impact resistance through its groove structure. By making the pixel defining layer multi-functional, the need for separate buffer layers is eliminated, reducing overall thickness and manufacturing complexity while maintaining impact resistance.
Solution Approach 2:
The protective buffer function is merged into the pixel defining layer itself. The groove structure of the pixel defining layer serves both as a structural definition element and as a stress-absorbing buffer, combining multiple functions into a single layer and avoiding the need for additional separate buffer layers.
Data Source
AI summary
The present application provides a display substrate, including an array substrate and a pixel defining layer. The pixel defining layer is formed on the array substrate and defines a plurality of sub-pixel areas. The pixel defining layer further defines a first groove, and the first groove is arranged to surround a sub-pixel area of the plurality of sub-pixel areas. When the display panel receives a falling impact, the impact is transferred to the pixel defining layer, so that the pixel defining layer expands in its extending direction. The groove is similar to a structure of a wall performing a function of releasing stresses and reducing expansion of the pixel defining layer. The present application further discloses a method for manufacturing a display substrate, and a display panel.