Microcavity Display Electrode Spacing for Luminance
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Solution Overview
Problem
Current display apparatuses face challenges in achieving high luminance and efficiency due to the trade-off between the efficiencies of light emitting layers and the limited space for integration, particularly in head-mounted displays where high resolution and miniaturization are required.
Innovation Solution
A display apparatus with a new structure comprising three light emission portions, each with a different color light emitting layer, where the positions and distances of these layers are optimized between the first and second electrodes to enhance luminance and efficiency, utilizing a substrate with a reflective electrode and microcavity configuration to improve light resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the distance between electrodes is increased to improve light emission efficiency, then luminance is improved, but the device size increases which contradicts miniaturization requirements
Solution Approach 1:
The patent applies parameter changes by precisely controlling the electrode distance within 310-450nm and positioning light emitting layers at specific distances (30-150nm from first electrode, 30-150nm from second electrode) to optimize both luminance and device size. This quantitative parameter optimization resolves the contradiction between improving light emission efficiency and maintaining miniaturization.
2Productivity
If multiple light emitting layers are stacked to improve resolution, then integration is improved, but the available space for each layer is reduced which limits luminance
Solution Approach 1:
The patent transitions from planar to three-dimensional stacking of light emitting layers (first, second, and third emission portions with different color light emitting layers) between the electrodes. This vertical dimensional arrangement allows multiple layers to coexist in a compact space while maintaining adequate distance from electrodes for efficient light emission, thus resolving the contradiction between integration and luminance.
3Reliability
If the distance between electrode and light emitting layer is increased to reduce interference, then efficiency is improved, but the overall device thickness increases
Solution Approach 1:
The patent optimizes the distance parameters between electrodes and light emitting layers by specifying precise ranges (30-150nm from first electrode, 30-150nm from second electrode). This parameter optimization achieves the dual goal of reducing interference for improved efficiency while maintaining compact device thickness through quantitative control of layer positioning.
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 optimized configuration results in improved luminance and efficiency of the display apparatus, overcoming the limitations of existing technologies by allowing for higher resolution and miniaturization in display devices, particularly in head-mounted displays.
Implementation Method 1
utilizing a substrate with a reflective electrode and microcavity configuration to improve light resonance
Data Source
AI summary
A display apparatus includes: a substrate having a first subpixel, a second subpixel and a third subpixel; a first electrode at each of the first, second and third subpixels; a first emission portion including a first light emitting layer on the first electrode; a second emission portion including a second light emitting layer on the first electrode; a third emission portion including a third light emitting layer on the first electrode; and a second electrode on the third emission portion. The first, second and third light emitting layers emit different color light from each other. A distance between the first electrode and the second electrode is in range from 310 nm to 450 nm.