Partial Color Filter and Reflective Electrode Display for High Resolution
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Solution Overview
Problem
Existing organic electroluminescent display apparatuses face challenges in achieving high resolution and compactness, particularly for virtual and augmented reality applications, where they struggle to balance high resolution with light efficiency and compactness.
Innovation Solution
The display apparatus incorporates a substrate with light-emitting elements and a partial color filter layer on some sub-pixels, while others have an air layer without a color filter, utilizing reflective electrodes to achieve constructive interference for specific colors and destructive interference for others, enhancing light efficiency and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a full color filter layer is formed on all sub-pixels, then color accuracy is improved, but light efficiency deteriorates
Solution Approach 1:
The patent applies local quality by forming color filter layers selectively only on red and blue sub-pixels, while green sub-pixels remain without color filter layers. This localized approach maintains color accuracy where needed (red and blue sub-pixels) while preserving light efficiency where possible (green sub-pixels), thereby resolving the contradiction between color accuracy and light efficiency.
2Manufacturing precision
If high resolution is achieved through smaller sub-pixel size, then resolution is improved, but light efficiency deteriorates
Solution Approach 1:
The patent implements local quality by differentiating the treatment of different sub-pixel types. Green sub-pixels, which naturally have higher luminance efficiency, are left without color filter layers to maximize light output, while red and blue sub-pixels receive color filter layers for color accuracy. This selective approach allows smaller sub-pixel sizes for high resolution while maintaining overall light efficiency through the optimized configuration.
3Volume of moving object
If compactness is increased for VR/AR applications, then device size is reduced, but optical performance deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the optical path length through the strategic placement of reflective electrodes at different positions. The optical path length is adjusted to compensate for the reduced device thickness, ensuring that constructive interference occurs at the desired wavelengths even in the compact VR/AR display structure. This maintains optical performance despite the reduced device size.
Solution Approach 2:
The patent utilizes another dimension by implementing reflective electrodes at multiple depth positions within the display structure. Instead of relying solely on the front surface, the reflective electrodes are positioned at different vertical depths to create optical paths that achieve constructive interference. This dimensional approach allows compact device design while preserving optical performance through controlled light interference patterns.
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 significantly improves light efficiency and enables the production of high-resolution, compact display apparatuses suitable for virtual and augmented reality applications by optimizing light output and reducing color mixing.
Implementation Method 1
the air layer has a different refractive index than a color filter of the partial color filter layer
Implementation Method 2
an optical distance between the first reflective electrode and the second electrode is adjusted to cause constructive interference for light reflected between the first reflective electrode and the second electrode
Implementation Method 3
constructive interference for light reflected between the first reflective electrode and the second electrode
Data Source
AI summary
The present disclosure is directed to a display apparatus having a high resolution with improved light efficiency. In one aspect, such display apparatus includes a substrate, a light emitting element formed on the substrate and configured to emit light of different colors via a plurality of sub-pixels, and a partial color filter layer formed on a first subset of the plurality of sub-pixels configured to output at least two of the different colors.