Fine Metal Mask Support Layer for OLED Color Mixing
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Solution Overview
Problem
The mainstream manufacturing process of OLED display devices faces challenges with high resolution, leading to poor color mixing due to the small size of sub-pixel areas, which affects the quality of the pixel array.
Innovation Solution
A display substrate design that includes a base substrate with independent first electrodes, a pixel definition layer with overlapping and non-overlapping portions, a light-emitting material layer with separate red, green, and blue light-emitting parts, and a support layer that contacts the light-emitting parts above the gaps between electrodes, effectively separating the light-emitting parts to reduce color mixing and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sub-pixel area is reduced to achieve high resolution, then the resolution is improved, but color mixing occurs and display quality deteriorates
Solution Approach 1:
The pixel definition layer is divided into overlapping and non-overlapping portions, creating distinct regions that separate adjacent light-emitting parts. The non-overlapping portions act as isolation zones between sub-pixels, preventing color mixing while maintaining high resolution through the overlapping regions that ensure complete coverage
Solution Approach 2:
Different regions of the pixel definition layer are assigned different functions: overlapping portions allow light-emitting material to extend and ensure coverage, while non-overlapping portions provide isolation to prevent color mixing. This local differentiation enables each region to optimize its function for the overall display quality
2Area of stationary object
If the pixel definition layer completely covers the first electrode to ensure coverage, then the coverage is improved, but color mixing between adjacent pixels increases
Solution Approach 1:
The pixel definition layer is segmented into overlapping and non-overlapping portions. The overlapping portions ensure complete coverage of the first electrode and allow light-emitting material extension, while the non-overlapping portions create isolation zones that prevent color mixing between adjacent pixels
Solution Approach 2:
The non-overlapping portions of the pixel definition layer act as intermediary isolation zones between adjacent light-emitting parts. These intermediate regions physically separate the light-emitting materials of different sub-pixels, preventing color mixing while allowing the overlapping regions to maintain complete electrode coverage
3Quantity of substance
If the light-emitting parts are closely arranged to increase pixel density, then the pixel density is improved, but color mixing and display quality deteriorate
Solution Approach 1:
The pixel definition layer is divided into overlapping and non-overlapping portions that create a segmented structure. The non-overlapping portions form isolation zones between closely arranged light-emitting parts, enabling high pixel density while preventing color mixing through this segmented isolation approach
Solution Approach 2:
The isolation function is achieved not by increasing horizontal spacing between pixels, but by utilizing the vertical dimension through the pixel definition layer's overlapping and non-overlapping portions. This dimensional approach allows close pixel arrangement while maintaining isolation through the layered structure
Data Source
AI summary
A display substrate, a display device, and a fine metal mask provided by the present disclosure, the display substrate including a base substrate; a plurality of mutually independent first electrodes, which are located on the base substrate; a pixel definition layer, which is located on the side of a layer in which the plurality of first electrodes are located away from the base substrate; a light-emitting material layer, which is located on the side of the pixel definition layer away from the base substrate; and a support layer, which is located above the pixel definition layer and is in direct contact with the light-emitting parts.