Peripheral Illumination for Head-Mounted Display Visual Continuity
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Solution Overview
Problem
Head-mounted devices struggle to provide satisfactory visual output in peripheral vision due to restricted angular ranges of computer-generated images, leading to abrupt cutoffs and difficulty in alerting users to peripheral computer-generated content.
Innovation Solution
Incorporating a peripheral display system with edge-lit light guide structures, light sources, and light-emitting diodes mounted along the rim of a transparent housing member, which provides diffuse illumination around the main display to enhance visual continuity and alert users to computer-generated content in their peripheral vision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a head-mounted device uses a transparent display system with a main display, then high-resolution images can be displayed in the central field of view, but computer-generated images are abruptly cut off in peripheral vision
Solution Approach 1:
The display system is segmented into two distinct components: a main display for central field of view and a peripheral display for peripheral vision. The main display uses waveguide technology for high-resolution imaging, while the peripheral display uses edge-lit light guide structures for diffuse illumination. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
Different regions of the display system are assigned different optical properties and functions. The central region (main display) provides high-resolution, focused images, while the peripheral region (peripheral display) provides diffuse, low-resolution illumination. This local differentiation of quality matches the human visual system's varying acuity across the field of view.
2Device complexity
If the device size and complexity are constrained, then the main display can be kept compact, but the angular range of computer-generated images is restricted
Solution Approach 1:
The peripheral display extends the angular range by utilizing the peripheral edges of the transparent housing member, effectively using the dimensional space around the main display. Edge-lit light guide structures are positioned at the periphery, allowing light to enter from the edges and distribute across the peripheral field of view, thus expanding coverage without increasing central device complexity.
3Adaptability or versatility
If a peripheral display system is added to provide diffuse illumination, then visual continuity in peripheral vision is improved, but device complexity increases
Solution Approach 1:
The peripheral display system merges multiple light sources (edge-lit light guide structures, light sources in rim members, light-emitting dies) into a unified peripheral illumination system. These components work together to provide diffuse light across the peripheral field of view, achieving enhanced angular coverage through combined action rather than multiple separate systems.
Solution Approach 2:
The transparent housing member serves multiple functions: it acts as the structural framework of the device, the substrate for the main display waveguide, and the mounting structure for the peripheral display components. The rim member similarly serves as both structural support and a mounting platform for light sources, reducing the need for additional dedicated components.
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 ensures seamless visual transitions and alerts users to computer-generated content in their peripheral vision without sharp cutoffs, improving the overall visual experience by providing diffuse illumination that complements the main display's high-resolution images.
Implementation Method 1
a waveguide and may have an output coupler that couples the image light out of the waveguide
Implementation Method 2
a peripheral display formed from edge lit light guide structures
Implementation Method 3
a light source that reflects light at an non-zero angle toward the eye box from a dispersion film on the transparent housing member
Data Source
AI summary
An electronic device such as a head mounted device may have a head-mounted support structure. A portion of the head-mounted support structure may form a transparent housing member through which real-world objects can be viewed from eye boxes. A display system for the head-mounted device may have a display device that provides image light to a waveguide and may have an output coupler that couples the image light out of the waveguide toward the eye box. Peripheral portions of the transparent housing member or other peripheral device structures may be provided with a peripheral display that emits diffuse light into a user's peripheral vision. The peripheral display may use light guide structures, light sources, reflective structures, and other structures that provide transparency to real-world light.