Aerial Display Light Shielding for Ghost Image Reduction
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Solution Overview
Problem
Existing aerial display apparatuses suffer from ghost images and reduced contrast due to unwanted light, which affects the quality of the displayed aerial images.
Innovation Solution
Incorporating a mirror device with orthogonally disposed reflective surfaces and a light shielding or limiting device that allows specific light components to pass through, while shielding ghosts and unwanted light, thereby improving image clarity and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a mirror device with orthogonally disposed reflective surfaces is used to form aerial images, then the aerial image can be displayed in the air, but ghost images and unwanted light are generated that reduce image contrast and quality
Solution Approach 1:
The patent extracts and removes unwanted light components from the optical path by introducing a light shielding member with strategically positioned openings. This member blocks ghost images and stray light while allowing desired display light to pass through, thereby separating useful light from harmful light components in the aerial display system
Solution Approach 2:
The light shielding member features localized openings at specific positions and angles that allow only certain light components to pass through. By creating non-uniform light transmission properties at different locations, the system selectively permits display light while blocking ghost images and unwanted light, improving overall image contrast
2Object-affected harmful factors
If a light shielding member with openings is introduced to block unwanted light, then ghost images are prevented, but the device structure becomes more complex
Solution Approach 1:
The light shielding member is integrated with the existing mirror device structure, combining multiple functions (light blocking, light guiding, and structural support) into a single component. This merging approach prevents ghost images while minimizing the increase in overall device complexity by utilizing the existing optical path geometry
Solution Approach 2:
The light shielding member acts as an intermediary element positioned between the mirror device and the aerial image formation zone. It mediates the interaction between display light and unwanted light, selectively blocking harmful components while maintaining the integrity of the desired aerial image without requiring fundamental redesign of the core mirror system
3Object-affected harmful factors
If the light path is controlled to improve image contrast, then display quality is enhanced, but the emission angle range is restricted
Solution Approach 1:
The light shielding member is designed with openings that dynamically control light transmission based on emission angles. By positioning openings at specific angular orientations, the system adapts to allow desired light components within certain angle ranges while blocking unwanted light, creating a dynamic light control mechanism that responds to the optical geometry of the aerial display system
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 effectively prevents ghost images from being visible and enhances the contrast of aerial images, leading to improved display quality by controlling the light path and emission angles.
Implementation Method 1
a mirror device which includes a plurality of optical elements each including two reflective surfaces that are orthogonally disposed, which reflects display light from the display device
Implementation Method 2
a light shielding member which is disposed on an optical path between the display device and the aerial image, which includes an opening that allows a portion of incident light to pass through, and which shields light incident on a region other than the opening
Implementation Method 3
a light limiting device which is disposed on an optical path between the display device and the aerial image, and which allows a light component of incident light having an angle of emission that falls within a predetermined range to be transmitted therethrough
Data Source
AI summary
An aerial display apparatus includes: a display device which displays an image; a mirror device which includes a plurality of optical elements each including two reflective surfaces that are orthogonally disposed, which reflects display light from the display device, and which forms an aerial image at a position that is plane-symmetrical to the display device; and a light shielding member which is disposed on an optical path between the display device and the aerial image, which includes an opening that allows a portion of incident light to pass through, and which shields light incident on a region other than the opening.