Transparent HMD Wiring Board Layout for Antenna Visibility Control
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Solution Overview
Problem
Existing head-mounted displays (HMDs) face challenges in reducing size and weight while maintaining radio sensitivity, particularly when equipped with communication antennas.
Innovation Solution
A transmissive-type HMD design featuring a transparent display device with a wiring board sandwiched between two substrates, where the wiring pattern area is positioned closer to the frame than the display unit, and includes a dummy pattern area to enhance transparency and reduce visibility of the antenna wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antenna is mounted on the head mounted display for communication with external devices, then radio sensitivity is improved, but size and weight increase
Solution Approach 1:
The antenna is merged with the wiring board structure, where the antenna pattern is formed by conductive wiring patterns integrated into the transparent substrate of the display device. This combines the communication function with the existing display structure, eliminating the need for separate antenna components that would add weight.
Solution Approach 2:
The wiring board serves multiple functions: it provides structural support for the display device, conducts electrical signals, and functions as an antenna for wireless communication. The conductive wiring patterns on the transparent substrate simultaneously perform electrical connection and radio wave transmission/reception, reducing overall device complexity and weight.
2Reliability
If an antenna is mounted on the head mounted display for communication with external devices, then radio sensitivity is improved, but size increases
Solution Approach 1:
The antenna is merged with the wiring board structure, where the antenna pattern is formed by conductive wiring patterns integrated into the transparent substrate of the display device. This combines the communication function with the existing display structure, eliminating the need for separate antenna components that would increase size.
Solution Approach 2:
The antenna pattern is nested within the wiring board structure, with conductive wiring patterns forming the antenna elements within the existing substrate boundaries. The antenna functionality is embedded within the display device's existing footprint rather than adding external antenna structures.
3Reliability
If wiring pattern area is positioned closer to the frame than the display unit, then radio sensitivity is improved, but visibility of wiring may increase
Solution Approach 1:
The substrate is made transparent with optimized optical properties in the region where the antenna wiring patterns are located. The transparent material allows light to pass through the wiring areas, making the conductive patterns invisible or minimally visible to users while maintaining their electrical and radio wave conduction functions.
Solution Approach 2:
The conductive wiring patterns are designed with optical properties that match the transparent substrate, making them visually imperceptible. The wiring patterns may use materials or structures that are transparent or have refractive indices matched to the substrate, causing them to blend with the surrounding transparent material and become invisible to users.
Data Source
AI summary
A head mounted display includes a frame and a transparent display device mounted to the frame. The display device includes a first base substrate, a wiring board provided on the first base substrate, and a display unit provided between the first base substrate and the wiring board. The wiring board includes a substrate that has transparency, and a wiring pattern area that is arranged on the substrate and includes pieces of wiring.