OLED Micro-Cavity Light Emitting Device with Non-Overlapping Layers
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Solution Overview
Problem
In OLED devices, the light emitted from the red light emitting layer in the blue light emitting unit and the light emitted from the blue light emitting layer in the blue light emitting unit interfere with each other, affecting the purity of the light emitted from the blue light emitting unit and the overall light emitting effect.
Innovation Solution
The light emitting device comprises a micro-cavity structure with different thicknesses in each light emitting unit (red, green, and blue) and a functional layer with non-overlapping light emitting layers, where the blue light emitting layer is not present in the red and green light emitting units, and the red and green light emitting layers are in contact, enhancing light purity and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional OLED structure with overlapping light emitting layers is used, then the device structure is simpler, but the light purity and brightness are reduced due to interference between light emitting layers
Solution Approach 1:
The light emitting device is divided into multiple independent light emitting units (red, green, blue), with each unit containing only its corresponding light emitting layer. This segmentation eliminates interference between different wavelength light emitting layers, improving light purity and brightness while maintaining reasonable structural complexity through modular organization.
Solution Approach 2:
Each light emitting unit is designed with localized properties - the red light emitting unit contains only the red light emitting layer, the green unit contains only the green light emitting layer, and the blue unit contains only the blue light emitting layer. This local quality approach ensures that each region emits only its designated wavelength without interference, optimizing light purity and brightness for each color channel.
2Reliability
If multiple light emitting layers are placed in each light emitting unit, then the device structure is more uniform, but the light emitting effect deteriorates due to interference between layers
Solution Approach 1:
The device is segmented into distinct light emitting units where each unit contains only the necessary light emitting layer for its function. This segmentation improves reliability of the light emitting effect by eliminating inter-layer interference, while the systematic arrangement keeps the overall layer configuration manageable and uniform across the device.
3Ease of manufacture
If the orthographic projections of light emitting layers overlap, then the manufacturing process is simpler, but the color gamut and light purity are reduced
Solution Approach 1:
The patent resolves the overlap issue by utilizing the planar dimension - each light emitting layer is positioned in a distinct spatial region such that their orthographic projections do not overlap. This dimensional separation maintains manufacturing simplicity through systematic patterning while achieving superior optical performance with enhanced color gamut and light purity.
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 configuration improves the light emitting effect by reducing interference between light emitting layers, resulting in higher brightness and purity of red, green, and blue light, thereby enhancing the color gamut and overall performance of the OLED device.
Implementation Method 1
each of the plurality of light emitting units comprises a micro-cavity structure... thicknesses of the micro-cavity structure in the red light emitting unit, the micro-cavity structure in the green light emitting unit, and the micro-cavity structure in the blue light emitting unit are different from each other
Data Source
AI summary
The present disclosure provides a light emitting device and a method for manufacturing the same, and a display device. The light emitting device includes a plurality of light emitting units including a red light emitting unit, a green light emitting unit, and a blue light emitting unit, each light emitting unit including a micro-cavity structure. The light emitting device includes an anode structure, a cathode and a functional layer therebetween. The functional layer includes a light emitting layer including a red light emitting layer at least partially located in the red light emitting unit, an orthographic projection of the red light emitting layer on the backplane not overlapping with that of the blue light emitting unit on the backplane; a green light emitting layer at least partially located in the green light emitting unit; and a blue light emitting layer at least partially located in the blue light emitting unit.