Reflective-Electrode Display Device for Ultra-High-Resolution Wearables
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Solution Overview
Problem
Existing wearable display devices, such as HMDs and AR glasses, face challenges in achieving ultra-high resolution and efficient light emission due to limitations in display technology, particularly in maintaining high pixel density without causing user dizziness.
Innovation Solution
A display device with a semiconductor backplane, light-emitting element backplane, and reflective electrode layers, along with pixel-defining films, is designed to enhance resolution and light efficiency by incorporating multiple reflective electrodes and trenches in the pixel-defining films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased to achieve ultra-high resolution, then display resolution is improved, but user dizziness occurs
Solution Approach 1:
The display panel is divided into multiple sub-pixels (red, green, blue sub-pixels) within each pixel unit. This segmentation allows for precise control of individual color components while maintaining overall high resolution, reducing the visual stress that causes dizziness in wearable displays
Solution Approach 2:
Different regions of the display panel employ optimized local structures including pixel-defining films with varying thicknesses and reflective electrode configurations tailored to specific viewing zones. This ensures optimal image quality and reduced dizziness effects in different areas of the display
2Loss of energy
If light efficiency is increased through multiple reflective electrodes, then light emission efficiency is improved, but device complexity increases
Solution Approach 1:
Multiple reflective electrodes (first, second, third reflective electrodes) are combined within a single pixel structure to collectively enhance light extraction efficiency. This merging approach achieves superior light efficiency compared to single reflective electrode designs while managing complexity through integrated fabrication processes
Solution Approach 2:
The reflective electrodes serve multiple functions: they reflect light to improve extraction efficiency, define pixel boundaries when combined with pixel-defining films, and provide structural support for the display element layer. This multi-functionality reduces the need for separate components, managing overall device complexity
3Ease of manufacture
If pixel-defining film structure is simplified, then manufacturing ease is improved, but light efficiency decreases
Solution Approach 1:
The pixel-defining film is designed with a stepped cross-sectional structure featuring multiple height levels instead of a uniform thickness. This dimensional variation optimizes light extraction by creating multiple reflection interfaces while remaining compatible with standard semiconductor fabrication processes like spin-coating and photolithography
Solution Approach 2:
The thickness of the pixel-defining film is precisely controlled with different thickness values in different regions (e.g., thicker in some areas, thinner in others) to optimize light extraction efficiency. These parameter changes are achieved through modified deposition or spin-coating processes that maintain manufacturing feasibility
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 solution provides an ultra-high-resolution display panel with increased light efficiency, addressing the limitations of existing technologies and enhancing user experience by reducing dizziness and improving visual clarity.
Implementation Method 1
a reflective electrode layer... The reflective electrode layer may include a first reflective electrode, a second reflective electrode above the first reflective electrode, a third reflective electrode above the second reflective electrode, and a fourth reflective electrode above the third reflective electrode
Data Source
AI summary
Provided are a display device, a manufacturing method thereof, and an electronic device. A display device includes a semiconductor backplane including pixel transistors, a light-emitting element backplane above the semiconductor backplane, and including conductive layers, vias, and insulating films, and a display element layer above the light-emitting element backplane, and including a light-emitting element for emitting light, a reflective electrode layer, a first electrode above the reflective electrode layer, and directly contacting the reflective electrode layer, and a stack layer and a second electrode sequentially stacked above the first electrode.