OLED Pixel Structure with Micro Cavities for Color Saturation
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Solution Overview
Problem
Conventional electroluminescent display panels with color filters suffer from poor color gamut and high power consumption due to light loss, as they use white light and color filters to produce primary colors, resulting in unsaturated colors and increased power usage.
Innovation Solution
A pixel structure for electroluminescent display panels featuring three sub-pixel regions with different organic light-emitting layers and micro cavities, allowing for the generation of primary colors without color filters, utilizing micro cavity effects to emit specific colors from each sub-pixel region, and using two organic light-emitting layers to produce three primary colors and one white color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used to produce primary colors from white light, then the display can show full-color images, but the color saturation is poor and power consumption increases
Solution Approach 1:
The invention extracts and eliminates the color filter component from the display structure. Instead of using white light and filtering it through color filters, the patent directly generates primary colors through organic light-emitting materials in specific sub-pixel regions, removing the source of light loss and poor color saturation
Solution Approach 2:
The invention applies different organic light-emitting materials with specific emission characteristics to different sub-pixel regions (red, green, blue sub-pixels). Each region has locally optimized material properties that directly emit the desired primary color with high saturation, eliminating the need for broadband white light and color filters
2Ease of manufacture
If color filters are used to generate primary colors, then full-color display is achieved, but about 50% of light is lost
Solution Approach 1:
The color filter layer is completely removed from the display structure. The patent replaces the filtering approach with direct emission from organic light-emitting materials, eliminating the 50% light loss that occurs when white light passes through color filters
Solution Approach 2:
The organic light-emitting materials in each sub-pixel region self-generate the required primary color light without needing external white light sources or filtering components. Each sub-pixel independently produces its color through electroluminescence of specifically designed organic materials
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 approach enhances color saturation and reduces power consumption by eliminating the need for color filters, allowing for more efficient color production and potentially extending the life of organic light-emitting layers.
Implementation Method 1
A first micro cavity is formed between the first anode and the first cathode in the first sub-pixel region, a third micro cavity is formed between the third anode and the third cathode in the third sub-pixel region, and the first micro cavity and the third micro cavity have different cavity lengths
Implementation Method 2
The first organic light-emitting layer is disposed at least in the first sub-pixel region and the second sub-pixel region, wherein the first organic light-emitting layer includes a first organic light-emitting material
Data Source
AI summary
A pixel structure of electroluminescent display panel has a first sub-pixel region, a second sub-pixel region and a third sub-pixel region. The pixel structure of electroluminescent display panel includes a first organic light-emitting layer and a second organic light-emitting layer. The first organic light-emitting layer, which includes a first organic light-emitting material, is disposed at least in the first sub-pixel region and the second sub-pixel region. The second organic light-emitting layer, which includes a second organic light-emitting material and a third organic light-emitting material, is disposed at least in the second sub-pixel region and the third sub-pixel region. The first organic light-emitting layer and the second organic light-emitting layer overlap in the second sub-pixel region. The first sub-pixel region and the third sub-pixel region have different cavity lengths.