Variable Micro-Cavity OLED Sub-Pixels for High Brightness
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Solution Overview
Problem
OLED micro-displays face challenges with low brightness and color gamut, particularly in outdoor applications where sunlight affects the display, and existing technologies limit the integration of high PPI due to the use of fine metal masks.
Innovation Solution
A display panel design with varying micro-cavity lengths between reflecting and light-emitting elements, allowing for modulation of light and improved color gamut and brightness without the need for fine metal masks, achieved through a base substrate with sub-pixels having different micro-cavity lengths and insulation layers, enabling the use of white light and RGB combinations for enhanced color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If white light and color filter layer combination is used in OLED micro-display, then device complexity is reduced and manufacturing is simplified, but color gamut decreases to approximately 80%
Solution Approach 1:
The patent applies local quality by creating different micro-cavity lengths for different sub-pixels (Red, Green, Blue) within the same pixel structure. Each sub-pixel has a specifically optimized cavity length that enhances its wavelength-specific light emission, thereby achieving high color gamut without requiring complex fine metal masks or additional color filtering components
Solution Approach 2:
The patent changes the physical parameter of micro-cavity length for different sub-pixels to optimize light emission. By adjusting the cavity length parameter for each sub-pixel type, the system achieves wavelength-specific enhancement that improves color gamut while maintaining manufacturing simplicity
2Device complexity
If uniform micro-cavity structure is used across all sub-pixels, then device complexity is reduced, but brightness and color purity cannot be optimized for different wavelengths
Solution Approach 1:
The patent implements local quality by introducing wavelength-specific micro-cavity length variations across different sub-pixels. This allows each sub-pixel to have optimized light emission characteristics for its specific wavelength range, achieving high brightness and color purity without significantly increasing overall device complexity
Solution Approach 2:
The patent segments the micro-cavity structure into different length configurations for different sub-pixel types (Red, Green, Blue). This segmentation allows independent optimization of each sub-pixel's light emission properties while maintaining a unified overall device architecture
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
The solution enhances the brightness and color gamut of OLED displays, enabling high-brightness and high-PPI performance suitable for military and AR applications without relying on fine metal masks, thus addressing the limitations of existing OLED technologies.
Implementation Method 1
micro-cavity lengths corresponding to the plurality of sub-pixels are different... a micro-cavity length is a distance between a side of the reflecting element away from the base substrate and a side of the second electrode proximate to the base substrate
Data Source
AI summary
A display panel, a method for fabricating the same, and a display device are provided. The display panel includes: a base substrate, and a plurality of pixels in an array on the base substrate, wherein each pixel includes a plurality of sub-pixels; each sub-pixel includes: a reflecting element on the base substrate, a first electrode on the reflecting element, a light-emitting element on the first electrode, and a second electrode on the light-emitting element; and in each of the pixels, micro-cavity lengths corresponding to the sub-pixels are different, wherein the micro-cavity length is the distance between the side of the reflecting element away from the base substrate and the side of the second electrode proximate to the base substrate.