HMD Window Transmissivity Control for Virtual Image Visibility
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Solution Overview
Problem
Conventional Head-Mounted Display (HMD) devices face limitations in displaying virtual images alongside actual environments due to small display screens, limited resolution, and issues with outdoor visibility, weight, size, power consumption, and heat emission.
Innovation Solution
An HMD device that detects ambient illumination, calculates and adjusts the transmissivity of a window using a projector, and provides a virtual image by projecting light through the window, optimizing the output based on transmissivity changes to enhance visibility and reduce power consumption and heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small display screen is used in HMD device, then the device size is reduced, but the resolution and outdoor visibility of virtual images are limited
Solution Approach 1:
The patent replaces the conventional LCD display screen with a projector-based optical system. Instead of using a physical display screen that limits resolution and visibility, the system projects virtual images directly into the user's field of view using projection optics, thereby achieving high resolution and improved outdoor visibility without increasing device size.
Solution Approach 2:
The patent transitions from a two-dimensional display screen to a three-dimensional projection space. By projecting images into the user's field of view rather than confining them to a small screen surface, the system achieves higher effective resolution and better visibility while maintaining compact form factor.
2Device complexity
If conventional LCD display is used, then the structure is simple, but power consumption and heat emission are high
Solution Approach 1:
The patent changes the operational parameters of the display system by using a projector with adjustable output based on ambient illumination. The controller adjusts the projector's light output according to detected ambient light levels, optimizing power consumption while maintaining image visibility. This dynamic parameter adjustment reduces unnecessary energy consumption compared to conventional LCDs that operate at fixed power levels.
3Illumination intensity
If window transmissivity is increased for better visibility, then outdoor visibility improves, but more light from actual environment is blocked
Solution Approach 1:
The patent implements a dynamic window transmissivity adjustment system that adapts to ambient illumination conditions. The controller detects ambient light levels and adjusts the window's transmissivity accordingly, allowing the system to optimize both virtual image visibility and environmental awareness in real-time. This dynamic adaptation resolves the contradiction between visibility enhancement and environmental adaptability.
Solution Approach 2:
The system incorporates ambient illumination detection as feedback to control window transmissivity. The sensor detects environmental light conditions and provides feedback to the controller, which adjusts the window properties accordingly. This closed-loop feedback mechanism ensures optimal balance between virtual image visibility and environmental adaptability across different lighting conditions.
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 improves outdoor visibility of virtual images, reduces the weight and size of the HMD device, and lowers power consumption while maintaining clear image recognition, addressing the limitations of conventional HMDs.
Implementation Method 1
a window configured to condense and reflect the light projected by the projector and to provide a virtual image formed by the reflected light to the user
Data Source
AI summary
A method is disclosed for providing a virtual image to a user in a Head-Mounted Display (HMD) device. The method includes detecting an ambient illumination, calculating a target transmissivity of window provided in the HMD device, based on the ambient illumination, adjusting a transmissivity of the window based on the calculated target transmissivity, and providing a virtual image to the user by projecting light to the window from a projector provided in the HMD device.