OLED Pixel Structure with Micro Cavity Lengths for Color Gamut
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Solution Overview
Problem
Conventional electroluminescent display panels, such as OLEDs, cannot accurately display colors like bright yellow and golden due to their limited color gamut, which affects color quality.
Innovation Solution
A pixel structure with four sub-pixel regions, each with a micro cavity of different lengths and sharing organic light-emitting layers, generates primary colors with distinct wavelengths, enhancing color gamut and saturation without the need for color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three sub-pixel regions with three primary colors (red, green, blue) are used, then the display panel achieves full-color display effect, but the color gamut is limited and cannot accurately display colors like bright yellow and golden
Solution Approach 1:
Adjacent sub-pixel regions share common organic light-emitting layers. Specifically, the first and second sub-pixel regions share the first organic light-emitting layer, while the third and fourth sub-pixel regions share the second organic light-emitting layer. This merging approach increases color gamut by enabling four distinct color emissions while reducing manufacturing complexity by decreasing the total number of organic light-emitting layers from four to two.
2Manufacturing precision
If four sub-pixel regions with different cavity lengths are used to generate primary colors with distinct wavelengths, then color saturation and purity are improved, but the manufacturing precision requirement increases
Solution Approach 1:
Each sub-pixel region is configured with a specific cavity length tailored to its required emission color. The first, second, third, and fourth sub-pixel regions have different cavity lengths (L1, L2, L3, L4 respectively) that are locally optimized to generate primary colors with distinct wavelengths. This local quality approach enables high color saturation and purity while maintaining ease of manufacture through localized parameter optimization rather than global uniformity.
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 pixel structure effectively increases color gamut and saturation by emitting primary colors with distinct wavelengths, allowing for improved color purity and accuracy, including the display of previously unattainable colors like bright yellow and golden.
Implementation Method 1
The first micro cavity, the second micro cavity, the third micro cavity and the fourth micro cavity have different cavity lengths. The first organic light-emitting layer is disposed in the first sub-pixel region and the second sub-pixel region for generating a first primary color light in the first sub-pixel region and generating a second primary color light in the second sub-pixel region.
Implementation Method 2
The first organic light-emitting layer is disposed in the first sub-pixel region and the second sub-pixel region for generating a first primary color light in the first sub-pixel region and generating a second primary color light in the second sub-pixel region. The first primary color light, the second primary color light, the third primary color light and the fourth primary color light have different spectra of wavelength.
Data Source
AI summary
A pixel structure of an electroluminescent display panel includes a first sub-pixel region, a second sub-pixel region, a third sub-pixel region and a fourth sub-pixel region having different cavity lengths. The first sub-pixel region and the second sub-pixel region share a first organic light-emitting layer, which can generate a first primary color light in the first sub-pixel region, and a second primary color light in the second sub-pixel region. The third sub-pixel region and the fourth sub-pixel region share a second organic light-emitting layer, which can generate a third primary color light in the third sub-pixel region, and a fourth primary color light in the fourth sub-pixel region. The first primary color light, the second primary color light, the third primary color light and the fourth primary color light have different spectra of wavelength.