Light Emitting Apparatus Viewing Angle Color Shift
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Solution Overview
Problem
Light emitting apparatuses with interference structures suffer from significant color shift and reduced luminance when viewed from oblique angles due to varying interference distances for different colors, leading to distorted white balance.
Innovation Solution
The design incorporates a specific layer structure for each color subpixel, including a reflective electrode layer, transparent insulating layer, transparent electrode layer, and light emitting layer, where the second reflection layer and transparent electrode layer are in contact, and the layer thicknesses are optimized to maintain color purity and luminance across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a microresonator structure with transparent insulating layer is used to improve color purity, then color purity is improved, but viewing angle characteristics deteriorate due to color shift in oblique directions
Solution Approach 1:
The patent applies different layer thickness configurations to different color subpixels (R, G, B) within the same display structure. Each color has optimized thickness values for the transparent insulating layer and electrode layers, creating local variations that compensate for wavelength-dependent interference effects at oblique viewing angles while maintaining high color purity through the microresonator structure.
2Measurement precision
If interference structure is used to enhance specific wavelength emission, then color purity is improved, but luminance uniformity across viewing angles deteriorates
Solution Approach 1:
The patent systematically varies multiple parameters including transparent insulating layer thickness, electrode layer thickness, and layer composition to optimize the interference conditions. By adjusting these parameters for each color subpixel, the invention maintains consistent luminance and white balance across different viewing angles while preserving the color purity benefits of the interference structure.
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 enhances the viewing angle characteristics by minimizing color shift and maintaining high luminance, ensuring consistent white balance even when viewed from oblique directions.
Implementation Method 1
a light emitting layer 204 having a dopant concentration that is different from a dopant concentration of the light emitting layer 204 of the green subpixel 101G
Implementation Method 2
a microresonator structure is used to improve the color purity in a full color display apparatus that includes light emitting elements using organic light emitting materials. A microresonator structure is a structure that increases light of a specific wavelength by causing direct light from a light emitting layer and reflected light from a reflection layer to interfere with each other.
Implementation Method 3
In an interference structure that causes specific wavelengths such as red, green and blue to resonate
Data Source
AI summary
A light emitting apparatus includes a first light emitting element for a first color and a second light emitting element for a second color whose wavelength is shorter than the wavelength of the first color. The first light emitting element includes a first reflection layer, a first transparent insulating layer, a first transparent electrode layer, a first light emitting layer, and a first upper electrode layer in this order. The second light emitting element includes a second reflection layer, a second transparent electrode layer, a second light emitting layer, and a second upper electrode layer in this order. The second reflection layer and the second transparent electrode layer are in contact with each other.