Display Substrate Arc-Shaped Openings for Color Separation Control
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Solution Overview
Problem
OLED display substrates using COE technology suffer from low light extraction rates due to the use of polarizers, leading to higher power consumption, and exhibit color separation phenomena due to diffraction at sub-pixel light-exiting openings, especially in arrangements with red, green, and blue sub-pixels.
Innovation Solution
The display substrate design incorporates arc-shaped first light-transmitting openings in the black matrix layer, with sub-pixel openings and electrode layers aligned to minimize diffraction, ensuring the light-emitting regions are fully exposed and reducing color separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If polarizers are used in OLED display substrates, then display quality is improved, but light extraction rate decreases and power consumption increases
Solution Approach 1:
The patent removes the polarizer component from the OLED display substrate structure. By extracting this harmful element that causes light loss and high power consumption, the invention achieves both low power consumption and high definition display quality without the traditional trade-off
Solution Approach 2:
The patent divides the display substrate into distinct functional layers including black matrix layer, pixel definition layer, and light-emitting device layer. Each layer is optimized independently with specific opening patterns to control light extraction and reduce diffraction, enabling high definition without polarizers
2Ease of manufacture
If conventional rectangular openings are used, then manufacturing is simplified, but color separation phenomena occur due to diffraction
Solution Approach 1:
The patent replaces conventional rectangular openings with arc-shaped openings in both the black matrix layer and pixel definition layer. The curved geometry reduces diffraction effects at the edges of openings, eliminating color separation phenomena while maintaining manufacturing feasibility through standard photolithography processes
3Use of energy by moving object
If sub-pixel openings are enlarged to improve light extraction, then light extraction rate increases, but diffraction effects and color separation worsen
Solution Approach 1:
The arc-shaped opening design allows for larger opening areas that improve light extraction while the curved geometry suppresses diffraction effects. This resolves the contradiction by enabling both high light extraction rate and reduced diffraction simultaneously
Solution Approach 2:
The patent optimizes the local geometry of openings with arc-shaped edges specifically at critical positions where diffraction occurs. This localized geometric optimization reduces color separation while maintaining overall light extraction efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances light extraction rates and reduces power consumption while minimizing color separation, improving the display effect by optimizing the alignment and shape of sub-pixel and light-transmitting openings.
Implementation Method 1
exhibit color separation phenomena due to diffraction at sub-pixel light-exiting openings
Data Source
AI summary
A display substrate and a display device are disclosed, and the display substrate has a plurality of sub-pixels, and includes a base substrate, a driving circuit layer, a pixel definition layer and a light-emitting device layer, and a black matrix layer. Each sub-pixel includes a pixel driving circuit in the driving circuit layer and a light-emitting device in the light-emitting device layer. The black matrix layer includes a plurality of first light-transmitting openings respectively exposing the light-emitting devices of the plurality of sub-pixels in a direction perpendicular to a surface of the base substrate. The pixel definition layer includes a plurality of sub-pixel openings, at least part of the plurality of sub-pixel openings are in one-to-one correspondence with and at least partially overlapped with the plurality of first light-transmitting openings, and at least one of the plurality of first light-transmitting openings has an arc-shaped edge.