Display Panel With Wavelength-Selective Emission Layer
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Solution Overview
Problem
Wearable display devices face challenges in achieving high integration and luminance with limited physical space, requiring a different structure to secure a color gamut without a color filter layer and improve emission efficiency.
Innovation Solution
A display panel structure with a substrate having subpixels featuring a reflective electrode, a white organic stack, and a second electrode with specific thickness and materials for enhanced light emission, allowing light to be emitted in a single strong cavity mode without interference, and an air gap between the display panel and the accommodation structure to eliminate wavelength-selective optical members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a color filter layer is used to secure color gamut, then color accuracy is improved, but light emission efficiency deteriorates due to absorption and reflection losses
Solution Approach 1:
The patent removes the color filter layer from the display structure, extracting the wavelength-selective function to the emission layer itself. The emission layer is designed to emit specific wavelengths directly, eliminating the need for separate color filtering components that cause light absorption and reflection losses.
Solution Approach 2:
The patent introduces a wavelength-selective emission layer as an intermediary between the electrical input and light output. This layer selectively emits specific wavelengths based on its material properties, acting as a mediator that achieves color accuracy without requiring additional color filter layers that would reduce light emission efficiency.
2Length of moving object
If the distance between display surface and viewer is fixed, then wearable form factor is achieved, but color gamut and emission efficiency are limited by optical member constraints
Solution Approach 1:
The patent changes the key parameter from using optical members with wavelength-selective properties to using a wavelength-selective emission layer. This parameter change allows the display to maintain thin form factor while achieving high emission efficiency, as the emission layer integrates the wavelength-selection function without adding significant thickness or optical losses.
3Measurement precision
If optical members with wavelength-selective properties are used, then color gamut is improved, but emission efficiency deteriorates due to absorption and reflection
Solution Approach 1:
The patent extracts the wavelength-selective function from separate optical members and integrates it into the emission layer. This eliminates the need for additional optical components that would cause absorption and reflection losses, achieving color gamut improvement without compromising emission efficiency.
Solution Approach 2:
The patent merges the wavelength-selection function with the light emission function in a single integrated emission layer. Instead of having separate components for generating light and selecting wavelengths, the emission layer performs both functions simultaneously, eliminating inter-component optical losses.
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 light emission efficiency, reduces light leakage, and improves color gamut and pure color efficiency, allowing for the omission of color filters and simplifying the display panel structure while maintaining high resolution and integration.
Implementation Method 1
a second electrode on the white organic stack, the second electrode having reflectivity and transmittance
Implementation Method 2
light emitted from the first light-emitting layer at the first subpixel may be emitted in a single strong cavity mode through the second electrode
Data Source
AI summary
Disclosed are a display panel and a display device including the same. The display panel including: a substrate having first to third subpixels each including a reflective electrode, a first electrode vertically spaced apart from a lower surface of the reflective electrode by a gradually increasing distance, a white organic stack on the first electrode, a second electrode on the white organic stack, the second electrode having reflectivity and transmittance, and a thickness of from 20 nm to 50 nm, a capping layer on the second electrode, and a transparent protective layer on the capping layer.