Concave Transmissive Mirror Light Superimposer for Privacy
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Solution Overview
Problem
Existing virtual image display devices with concave transmissive mirrors suffer from image light leakage, allowing external observers to see the displayed images, which compromises privacy and image clarity.
Innovation Solution
A virtual image display device incorporating a light superimposer on the external side of a partial reflective film in the concave transmissive mirror, which superimposes additional light in the visible range onto the image light, effectively hiding the leaked light and preventing external observation of the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If image light is emitted in the front direction from the concave transmissive mirror, then the displayed image can be seen clearly by the wearer, but the image can also be disadvantageously seen from the outside
Solution Approach 1:
A light superimposer is introduced as an intermediary component between the image light path and the external environment. This device superimposes additional light in the visible range onto the image light that transmits through the partial reflective film, effectively masking the leaked image light and preventing external observers from viewing the displayed image while allowing the wearer to see the image clearly
2Illumination intensity
If a partial reflective film is used in the concave transmissive mirror, then image light can be reflected toward the wearer, but additional light must be superimposed to mask the transmitted image light
Solution Approach 1:
The light superimposer is designed to perform multiple functions: it generates additional visible light, superimposes this light onto the image light path, and masks the leaked image to prevent external observation. By consolidating these functions into a single component, the overall device complexity is managed while achieving the desired privacy protection
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 that the leaked light is masked by additional light, enhancing privacy by preventing external visibility of the displayed images while maintaining image clarity for the wearer.
Implementation Method 1
a light superimposer provided on an external side of a partial reflective film provided in the concave transmissive mirror, the light superimposer superimposing additional light in a visible range on image light transmitted through the partial reflective film
Implementation Method 2
a concave transmissive mirror configured to reflect image light emitted from the image generation device
Implementation Method 3
image light transmitted through the partial reflective film
Data Source
AI summary
A virtual image display device includes an image generation device, and a concave transmissive mirror configured to reflect image light emitted from the image generation device. A light superimposer is provided on an external side of a partial reflective film provided in the concave transmissive mirror, the light superimposer being configured to superimpose additional light in a visible range on image light transmitted through the partial reflective film.