HMD Light Regulating Device with Segmented Transmittance
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Solution Overview
Problem
Display apparatuses used in head-mounted displays often fail to provide sufficient contrast for virtual images, especially in bright environments, making it difficult for users to safely navigate and recognize the external environment.
Innovation Solution
A display device with a layer having distinct transmittance regions, where one region is optimized for increased visibility of computer-generated images and the other for higher visibility of the external environment, controlled by circuitry to adjust light shielding ratios dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light regulating device with high light shielding ratio is used to increase virtual image contrast, then visibility of computer generated image is improved, but visibility of external environment deteriorates
Solution Approach 1:
The light regulating device is divided into multiple independent regions with different light shielding ratios. The first region has a higher light shielding ratio to enhance virtual image contrast, while the second region has a lower light shielding ratio to maintain external environment visibility. This segmentation allows simultaneous optimization of both contradictory requirements in different spatial zones.
Solution Approach 2:
Different regions of the light regulating device are assigned different optical properties (light shielding ratios) according to their specific functional requirements. The first region is optimized for virtual image display with higher light shielding, while the second region is optimized for external viewing with lower light shielding,实现ing local quality optimization.
2Reliability
If the light shielding ratio is increased to improve virtual image visibility, then contrast of virtual image is improved, but recognition of external environment becomes difficult
Solution Approach 1:
The light regulating device is segmented into multiple regions with different light shielding ratios. The first region provides high light shielding for reliable virtual image visibility, while the second region provides low light shielding for easy external environment recognition, resolving the contradiction between these two requirements.
3Device complexity
If a single light shielding ratio is used for the entire layer, then device complexity is reduced, but visibility requirements for different regions cannot be satisfied simultaneously
Solution Approach 1:
The light regulating device is divided into multiple regions with different light shielding ratios to satisfy region-specific visibility requirements. While this increases structural complexity compared to a single uniform layer, it enables the device to simultaneously meet contradictory visibility requirements for different functional zones.
Solution Approach 2:
Different regions of the light regulating device are assigned different optical properties to match their specific functional requirements. The first region has higher light shielding for virtual image display, while the second region has lower light shielding for external viewing, achieving local quality optimization.
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
This configuration enhances contrast for virtual images while allowing users to safely navigate and recognize the external environment, with the ability to accurately initialize the virtual image projection region through a test pattern and light shielding ratio adjustment.
Implementation Method 1
a light regulating device 50 which regulates light passing therethrough and has a projection image of the virtual image thereon; wherein light shielding ratio of the virtual image projection region of the light regulating device is controlled to be higher than light shielding ratio of the other region of the light regulating device
Data Source
AI summary
A display device, a method, and a computer-readable medium. The display device includes a layer including a first region and a second region, wherein the first region and the second region are configured to be visible to a user of the display device; and circuitry configured: to control displaying a computer generated image on an optical device overlapping the layer and to control a first transmittance of the first region of the layer to be lower than a second transmittance of the second region of the layer such that: a visibility, through the first region, of the computer generated image is increased and a visibility, through the second region, of an environment opposite the user relative to the display device is higher than a visibility, through the first region, of the environment opposite the user relative to the display device.