OLED Display Substrate Pixel Layout for Reduced Color Mixing
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Solution Overview
Problem
In organic light-emitting diode (OLED) display panels with a top emission structure, the arrangement of light-emitting areas leads to color mixing issues due to the distance between light-emitting devices and color filter units, affecting display quality.
Innovation Solution
The display substrate is designed with specific arrangements of light-emitting areas and pixel driver circuits, where the first and second effective light-emitting areas are closer together than the third, and the third area is farther apart, optimizing the distance to reduce color mixing by using a third light-emitting device to emit green light and first and second devices to emit red and blue light, respectively, and incorporating a color filter substrate with overlapping color filter units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between light-emitting devices and color filter units is reduced, then color mixing is reduced, but the arrangement flexibility and manufacturing precision requirements increase
Solution Approach 1:
The patent applies asymmetry by implementing a non-uniform distance arrangement where the third effective light-emitting area (green) is positioned farther from the first and second effective light-emitting areas (red and blue) than they are from each other. This asymmetric spatial configuration optimizes color separation by increasing distance for the green light-emitting device that causes more significant color mixing, while maintaining tighter spacing for red and blue devices, thereby resolving the contradiction between reducing color mixing and maintaining manufacturing feasibility
Solution Approach 2:
The patent applies local quality by differentiating the spatial arrangement for different color channels. Specifically, the third effective light-emitting area is positioned at a greater minimum distance (20-25 μm) compared to the first and second effective light-emitting areas (10-20 μm). This localized optimization tailors the distance parameter to the specific characteristics of each light-emitting device, reducing color mixing where it matters most while maintaining overall compactness
2Illumination intensity
If the aperture ratio is increased to improve display quality, then light emission efficiency improves, but color mixing between adjacent pixels increases
Solution Approach 1:
The asymmetric arrangement of the third effective light-emitting area farther from its neighbors compensates for the increased aperture ratio by creating greater spatial separation for the green light-emitting device. This allows larger light-emitting areas to be implemented without proportionally increasing color mixing, as the critical green channel maintains optimal distance spacing
Solution Approach 2:
The patent changes the spatial parameter (distance) specifically for the third effective light-emitting area to 20-25 μm, which is greater than the 10-20 μm distance for the first and second effective light-emitting areas. This parameter adjustment allows the aperture ratio to be increased while maintaining color purity by optimizing the distance parameter for each color channel
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 arrangement alleviates color mixing problems by reducing the amount of other colored light reaching the color filter units, thereby improving the display quality by ensuring accurate color representation.
Implementation Method 1
a first light-emitting device, a second light-emitting device and a third light-emitting device configured to emit light of three primary colors, respectively
Data Source
AI summary
A display substrate includes a first base and a plurality of pixel units arranged in rows and in columns. A pixel unit includes a first light-emitting device, a second light-emitting device and a third light-emitting device. A first effective light-emitting area where the first light-emitting device is located and a second effective light-emitting area where the second light-emitting device is located are arranged at intervals along a first direction, a third effective light-emitting area where the third light-emitting device is located is spaced apart from both the first effective light-emitting area and the second effective light-emitting area arranged along a second direction. A minimum distance between the first effective light-emitting area and the second effective light-emitting area along the first direction is less than a minimum distance between the third effective light-emitting area and both the first effective light-emitting area and the second effective light-emitting area along the second direction.