Head-Mounted Display Electrode Via Layout for Higher Resolution
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Solution Overview
Problem
Existing display devices for head-mounted devices face challenges in providing high-resolution images due to the need for minimizing unnecessary space in the area where electrodes are located, which affects the overall design and performance.
Innovation Solution
The display device incorporates a specific electrode configuration with vias that overlap the reflective electrode in the thickness direction, reducing unnecessary space by using electrode vias that do not overlap the pixel-defining film openings and ensuring uniform separation distances between electrodes, connected through capping conductive layers for efficient electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional electrode configurations are used in display devices for head-mounted devices, then the device structure is simple and easy to manufacture, but unnecessary space is created in the electrode area which reduces image resolution
Solution Approach 1:
The patent positions vias in the thickness direction (vertical dimension) to overlap with the reflective electrode, rather than placing them in the planar area. This vertical stacking approach eliminates unnecessary planar space while maintaining electrical connectivity, thereby improving resolution without significantly increasing manufacturing complexity
Solution Approach 2:
The reflective electrode serves multiple functions: it provides electrical connectivity through the via, acts as a reflective surface for light emission, and defines the pixel boundary. This multi-functionality reduces the need for separate structures, optimizing space utilization while maintaining manufacturing feasibility
2Manufacturing precision
If vias are positioned to overlap the pixel-defining film opening, then electrical connectivity is simplified, but unnecessary space is increased which reduces display resolution
Solution Approach 1:
The via is positioned in the thickness direction to overlap the reflective electrode rather than the pixel-defining film opening in the planar view. This vertical positioning eliminates the conflict between via placement and pixel definition, improving resolution while maintaining standard manufacturing processes
Solution Approach 2:
The patent creates different spatial zones: the via overlaps the reflective electrode in the vertical direction for electrical connectivity, while the pixel-defining film maintains its planar opening for light emission. Each component has optimized local positioning that avoids interfering with others, achieving high resolution without excessive manufacturing precision requirements
3Manufacturing precision
If uniform separation distances are maintained between electrodes, then manufacturing is simplified and alignment is easier, but unnecessary space is created which reduces the effective display area
Solution Approach 1:
The via connects electrodes in the thickness direction, allowing uniform planar separation distances to be maintained for manufacturing simplicity, while the vertical connectivity eliminates the need for additional lateral space. This separates the alignment requirement (planar) from the connectivity function (vertical), maximizing effective display area
Data Source
AI summary
Provided are a display device and a head-mounted display device including the same. The display device includes a substrate, a backplane including conductive layers above the substrate, vias connected to the conductive layers, and interlayer insulating layers respectively between the conductive layers, a reflective electrode above the backplane, and connected to one of the vias, a first insulating layer above the reflective electrode, a first electrode disposed on the first insulating layer, and electrically connected to the reflective electrode, a pixel-defining film above the first electrode, and defining an opening exposing a portion of the first electrode, a light-emitting stack above the pixel-defining film and the first electrode, and a second electrode above the light-emitting stack, wherein the vias include a first via contacting the reflective electrode, and overlapping the first electrode in a thickness direction.