Flexible Display Substrate Pixel Defining Layer Bending Region Light Transmission
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Solution Overview
Problem
In flexible AMOLED displays, the pixel defining layer blocks emergent light in bending regions, causing color shift and reduced display quality, particularly evident in large-angle bent and rollable screens where light absorption leads to yellowing of the bending region.
Innovation Solution
A display substrate with a pixel defining layer featuring first openings in the bending region with a taper angle greater than a preset angle, correlated with the curvature, ensuring that emergent light is not blocked, and optionally including a side surface structure with varying thicknesses or sawtooth patterns to minimize thickness and gradient angle, preventing light absorption and maintaining color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pixel defining layer is used to define sub-pixel regions, then the display structure is well-defined and manufacturing is facilitated, but the emergent light in bending regions is blocked causing color shift and reduced display quality
Solution Approach 1:
The pixel defining layer is designed with different opening angles for different regions: a first opening angle in bending regions that allows light transmission, and a second opening angle in flat regions that provides strong light blocking. This local differentiation resolves the contradiction by adapting the structure to the specific functional requirements of each region.
Solution Approach 2:
The opening angle of the pixel defining layer is changed as a key parameter to resolve the contradiction. By adjusting the opening angle to be greater than a preset angle in bending regions, the structure transitions from blocking light to transmitting light, thereby maintaining display quality while preserving the light-blocking function in flat regions.
2Object-generated harmful factors
If the pixel defining layer has a small opening angle to block light effectively, then light blocking performance is improved, but the display quality in bending regions deteriorates due to light absorption and yellowing
Solution Approach 1:
Different opening angles are applied to different regions of the pixel defining layer. The first opening angle in bending regions prevents light absorption and yellowing, while the second opening angle in flat regions ensures effective light blocking. This local quality differentiation resolves the contradiction between light blocking performance and display quality.
Solution Approach 2:
Instead of using a uniform small opening angle throughout to block light, the invention inverts the approach by using a larger opening angle in bending regions where light transmission is needed, and only applies the small opening angle in flat regions where light blocking is the primary concern.
3Object-generated harmful factors
If the pixel defining layer thickness is increased to improve light blocking, then light absorption is enhanced, but this causes more severe color shift and yellowing in bending regions
Solution Approach 1:
The pixel defining layer structure is optimized locally in bending regions by using a larger opening angle, which prevents the formation of thick light-blocking structures that would cause color shift and yellowing. In flat regions, the structure can be more aggressive in light blocking without causing the same issues.
Solution Approach 2:
The opening angle parameter is changed in bending regions to prevent the formation of thick pixel defining layer structures, thereby eliminating the root cause of color shift and yellowing while maintaining light blocking capability in flat regions.
Data Source
AI summary
A display substrate, a display panel, and a display apparatus. The display substrate includes: a base substrate, the base substrate comprising bending regions; a plurality of sub-pixels located on the base substrate; and a pixel defining layer, wherein the pixel defining layer is provided with a plurality of first openings in the bending regions, the orthographic projections of the sub-pixels in the bending regions are located in the orthographic projections of the first openings, the angle of gradient of the first openings is greater than a preset angle, and the angle of gradient of the first openings has a positive correlation with the curvature of the bending regions, such that emergent light of the sub-pixels in the bending regions is not blocked by the pixel defining layer.