Head Mounted Display Pad Conductive Layers for High Resolution
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Solution Overview
Problem
Existing head-mounted displays struggle to provide high-resolution images due to limitations in display technology.
Innovation Solution
A display device comprising a semiconductor substrate with transistors, conductive layers, a reflective electrode layer, an optical auxiliary layer, light-emitting elements, and pad conductive layers, which are designed to reduce pixel size and enhance image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is reduced to increase resolution, then the image resolution is improved, but the conductive layers become more susceptible to damage during inspection processes
Solution Approach 1:
The patent applies preliminary action by forming protective pad conductive layers (first and second pad conductive layers) with greater thickness than the reflective electrode layer before inspection processes. This pre-formed protective structure prevents damage to underlying conductive layers during subsequent inspection, while the overall pixel dimensions are reduced to achieve high resolution (3000 PPI or higher). The protective layers are prepared in advance to withstand inspection procedures without compromising the integrity of thinner conductive layers beneath.
2Measurement precision
If the pixel size is reduced to achieve high-resolution images, then the image quality is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into the pad conductive layers, which serve both as electrical connection elements and as protective structures for underlying conductive layers. By combining the electrical pad function with the protective function in a single integrated structure, the design reduces overall structural complexity while maintaining high resolution. The first and second pad conductive layers are formed as part of the same conductive layer structure, simplifying the manufacturing process compared to adding separate protective elements.
3Measurement precision
If the pixel size is reduced to provide high-resolution images, then the display quality is improved, but the area available for conductive layers decreases
Solution Approach 1:
The patent applies local quality by concentrating the conductive layer structure specifically in the pad regions where electrical connections are needed, rather than distributing conductive material uniformly across the entire pixel area. The first and second pad conductive layers are formed with greater thickness and are strategically positioned to provide both electrical connectivity and protection. This localized approach allows the majority of the pixel area to be optimized for light-emitting elements, achieving high resolution while maintaining adequate conductive layer area in critical regions.
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 enables the provision of high-resolution images by reducing pixel size and ensuring the integrity of conductive layers during inspection processes.
Implementation Method 1
a display area DAA for displaying images, the light-emitting elements LE being located in the display area DAA
Implementation Method 2
a reflective electrode layer RL, the optical auxiliary layer INS10 being located on the reflective electrode layer RL
Data Source
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AI summary
Provided are a display device, and a head mounted display comprising the display device, the display device including a semiconductor substrate including transistors, conductive layers above the semiconductor substrate, a reflective electrode layer above the conductive layers, an optical auxiliary layer above the reflective electrode layer, light-emitting elements above the optical auxiliary layer, and including a first electrode, a light-emitting stack, and a second electrode, a pixel-defining film above the first electrode to partition light-emitting areas of the light-emitting elements, a first pad conductive layer above the conductive layers, and a second pad conductive layer above the first pad conductive layer, a thickness of the first pad conductive layer and a thickness of the second pad conductive layer being greater than a thickness of the reflective electrode layer.