OLED Substrate Accommodating Portion Reduces Light Crosstalk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In OLED displays, the proximity of adjacent light-emitting elements leads to light crosstalk and color cast issues due to overlapping light-emitting film layers, causing screen defects such as color cast during display.
Innovation Solution
The OLED display substrate features a base substrate with light-emitting elements and pixel defining layers, where the pixel defining layer has an accommodating portion with a non-overlapping orthographic projection on the base substrate, creating a step difference that prevents adjacent light-emitting elements from emitting light simultaneously, thus reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adjacent light-emitting elements are placed close together to increase display resolution, then display resolution is improved, but light crosstalk and color cast occur due to overlapping light-emitting film layers
Solution Approach 1:
The patent introduces a vertical dimension by creating an accommodating portion (recess) in the pixel defining layer. This recess structure allows the light-emitting film layer to extend downward, separating the light emission paths of adjacent pixels in the vertical direction while maintaining close horizontal spacing, thus preventing light crosstalk without compromising display resolution
Solution Approach 2:
The pixel defining layer is segmented into different levels: a main surface level and an accommodating portion level. This segmentation creates distinct spatial zones that isolate the light-emitting film layers of adjacent pixels, preventing their optical interference while allowing both to function at high resolution
2Object-generated harmful factors
If the light-emitting film layer is extended to the pixel defining layer to reduce crosstalk, then light crosstalk is reduced, but the light-emitting film layer may break due to step difference
Solution Approach 1:
The accommodating portion is designed with a bottom surface that provides a support platform for the light-emitting film layer. This pre-prepared support structure prevents the film layer from breaking when it extends to the pixel defining layer, as the bottom surface of the recess cushions and supports the film during the transition across the step difference
Solution Approach 2:
The light-emitting film layer is nested within the accommodating portion of the pixel defining layer. The film layer extends into the recess space and is supported by the bottom surface of the recess, creating a nested configuration that both isolates adjacent pixels and protects the film layer from mechanical stress
Data Source
AI summary
The disclosure relates to an OLED display substrate, a manufacturing method and a display apparatus. The OLED display substrate comprises a base substrate, and a plurality of light-emitting elements and a plurality of pixel defining layers formed on the base substrate, wherein a pixel defining layer is located between any two adjacent light-emitting elements of the plurality of light-emitting elements; and a surface of the pixel defining layer facing away from the base substrate comprises an accommodating portion, a bottom surface of the accommodating portion and the surface of the pixel defining layer facing away from the base substrate are located at different planes, and an orthographic projection of the accommodating portion on the base substrate does not overlap with an orthographic projection of the plurality of light-emitting elements on the base substrate. The method for manufacturing the OLED display substrate is configured to manufacture the above OLED display substrate.