Head Mounted Display Microcavity Optimization for Luminance
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Solution Overview
Problem
Wearable or head-mounted display devices face challenges in achieving both high luminance and high integration within a restricted area, as existing materials struggle to maintain luminance characteristics across different viewing angles and colors.
Innovation Solution
A head-mounted display device with a display panel comprising subpixels, each with a unique configuration of white organic stacks, reflection plates, and color filters, optimized for specific wavelength transmission, and a fixed distance from the viewer's eye to enhance light emission and microcavity effects, allowing for high luminance and color purity without the need for additional color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white organic stack is used in all subpixels to achieve high luminance, then luminance is improved, but color differentiation becomes difficult without additional color filters
Solution Approach 1:
The patent applies local quality by varying the distance between the reflection plate and first electrode across different subpixels (first distance for blue, second distance for green, third distance for red). This creates location-specific optical cavities that resonate at different wavelengths, enabling color differentiation without additional color filters while maintaining high luminance from the white organic stack
Solution Approach 2:
The patent changes the physical parameter of electrode spacing to control optical resonance. By adjusting the distance between the reflection plate and first electrode differently in each subpixel, the optical cavity resonates at different wavelengths (480-520nm for blue, 520-560nm for green, 600-650nm for red), achieving color differentiation through parameter variation rather than additional filtering components
2Measurement precision
If the display area is expanded to improve resolution, then resolution is improved, but the device size and weight increase
Solution Approach 1:
The patent uses optical resonance enhancement through carefully controlled cavity distances to amplify light emission intensity. This allows the display to achieve high brightness and visibility with a smaller physical area, maintaining resolution without increasing device size and weight
Solution Approach 2:
The patent transitions from using lateral expansion (more area) to achieve resolution to using vertical dimension optimization (precise control of layer distances) to enhance light emission. By optimizing the vertical spacing for optical resonance, the display achieves high performance in a compact form factor
3Device complexity
If the distance between display surface and viewer is reduced to improve integration, then integration is improved, but luminance characteristics vary with viewing angle
Solution Approach 1:
The patent creates location-specific optical cavities with different resonance characteristics for each subpixel position. These localized resonant structures maintain stable color emission (blue 480-520nm, green 520-560nm, red 600-650nm) regardless of viewing angle, compensating for the effects of reduced display-to-viewer distance
Solution Approach 2:
The patent optimizes the optical cavity parameters (distance between reflection plate and first electrode) to create resonant structures that are insensitive to viewing angle changes. This parameter optimization ensures stable luminance characteristics are maintained even when the display is positioned close to the viewer's eye for high integration
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 improves luminance and color purity by concentrating specific wavelengths, reducing light loss, and extending the lifespan of the display panel, while maintaining high integration and resolution within a compact form.
Implementation Method 1
a white organic stack on the first electrodes at the first, second and third subpixels
Implementation Method 2
a reflection plate provided in the first, second and third subpixels
Implementation Method 3
first electrodes vertically spaced apart from a lower surface of the reflection plate by a first distance, a second distance and a third distance... to enhance light emission and microcavity effects
Data Source
AI summary
A head mounted display device comprises a display panel comprising first to third subpixels defined at a substrate, a reflection plate provided in the first, second and third subpixels, first electrodes vertically spaced apart from a lower surface of the reflection plate by a first distance, a second distance and a third distance at the first, second and third subpixels, respectively, a white organic stack on the first electrodes at the first, second and third subpixels, a second electrode on the white organic stack, and a first color filter on the second electrode at the third subpixel to transmit light having a long wavelength.