Display Substrate Repeat Units for High Resolution OLED
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Solution Overview
Problem
Current display technologies face challenges in achieving high resolution while maintaining process simplicity and reducing production costs, particularly in the manufacturing of OLED display devices.
Innovation Solution
A display substrate design that includes a base substrate with repeat units arranged in a specific pattern, featuring one first-color sub-pixel, two second-color sub-pixels, and one third-color sub-pixel, where the sub-pixels have overlapping or connected light-emitting layers and optimized spacing to maximize the light-emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a virtual pixel method is used to change the arrangement mode of sub-pixels to reduce the number of sub-pixels, then the manufacturing process difficulty is reduced and production cost is reduced, but the display resolution is compromised
Solution Approach 1:
The patent divides the display into repeat units with specific sub-pixel arrangements (one first-color sub-pixel, two second-color sub-pixels, one third-color sub-pixel). This segmentation allows the use of virtual pixels to reduce physical sub-pixel density while maintaining display quality through optimized geometric arrangements and overlapping light-emitting layers.
Solution Approach 2:
The patent utilizes overlapping light-emitting layers in the vertical dimension to compensate for reduced horizontal sub-pixel density. By arranging sub-pixels in a specific pattern and allowing light-emitting layers to overlap, the display achieves high resolution through three-dimensional light emission rather than relying solely on two-dimensional sub-pixel packing.
2Duration of action of stationary object
If the light-emitting area of sub-pixels is increased to enhance service life, then the display duration is improved, but the spacing between sub-pixels must be optimized which complicates the arrangement pattern
Solution Approach 1:
The patent optimizes the spacing and geometric parameters of sub-pixels within repeat units to maximize light-emitting area. By carefully adjusting the positions and dimensions of sub-pixels and their light-emitting layers, the design extends service life while maintaining a manageable arrangement pattern through mathematical optimization.
3Manufacturing precision
If three types of fine metal masks are used to prepare sub-pixels of three colors, then the manufacturing precision is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent designs a repeat unit structure that can be manufactured using a reduced set of fine metal masks by utilizing the virtual pixel method. The specific sub-pixel arrangement allows certain masks to serve multiple functions or be positioned at different locations, reducing the total number of masks required while maintaining the precision needed for multi-color sub-pixel preparation.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a plurality of repeat units. Each of the plurality of repeat units includes one first-color sub-pixel, one second-color sub-pixel pair and one third-color sub-pixel which are arranged in a first direction, the second-color sub-pixel pair includes two second-color sub-pixels arranging in a second direction. Connecting lines of centers of orthographic projections of light-emitting regions of four second-color sub-pixels on the base substrate form a first trapezoid, and at least one edge of the first trapezoid is located outside orthographic projections of light-emitting regions of respective sub-pixels on the base substrate.