Dihedral Reflector Array Layout for False-Image-Free Floating Displays
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Solution Overview
Problem
Existing image display devices that use dihedral corner reflectors or corner cube reflectors face challenges in avoiding false images at unintended locations and have complex configurations, limiting their practical application and usability.
Innovation Solution
An image display device with a simple structure that includes a reflector array of dihedral corner reflectors, controlled by a controller to form a floating image in mid-air based on surrounding information, using a light source and imaging elements to adjust the position and light parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dihedral corner reflectors or corner cube reflectors are used to display images in mid-air, then the image can be displayed without a display device, but false images appear at unintended locations
Solution Approach 1:
The patent applies local quality by varying the tilt angles of individual reflector rows according to their specific positions in the array. Each reflector row is tilted at a different angle optimized for its location, allowing precise control of reflected light direction. This position-dependent local optimization enables the system to direct light only to the intended observer while preventing false images at other locations.
2Adaptability or versatility
If corner cube reflectors are used to freely set the floating image position, then the image formation position can be set relatively freely, but the configuration becomes complex
Solution Approach 1:
The patent segments the reflector array into multiple independent reflector rows, where each row can be tilted at a different angle. This segmentation allows the system to achieve flexible image positioning by controlling individual rows rather than requiring a complex overall optical element configuration. The segmented approach simplifies the design while maintaining adaptability.
Solution Approach 2:
The patent introduces dynamic adjustability by making the tilt angles of reflector rows variable rather than fixed. The tilt angles can be adjusted based on the observer's position and viewing conditions, enabling flexible image positioning without complex mechanical optical elements. This dynamic approach replaces static complex configurations with simpler adjustable parameters.
3Device complexity
If a simple structure is used for the imaging element, then the device configuration is simplified, but the ability to control light direction and prevent false images is reduced
Solution Approach 1:
The patent changes the geometric parameters of the reflector array, specifically the tilt angles of individual reflector rows, to optimize light direction control. By adjusting these angular parameters based on position, the system achieves reliable false image prevention while maintaining a simple overall structure. The parameter optimization approach replaces complex structural solutions with refined geometric configurations.
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 device effectively forms a floating image at a desired position with appropriate light output and chromaticity, reducing false images and simplifying the structure for improved usability and space efficiency.
Implementation Method 1
The reflector array includes a plurality of reflector rows, each of the plurality of reflector rows including a plurality of dihedral corner reflectors... Each of the plurality of dihedral corner reflectors includes a first reflecting surface configured to reflect light from a first surface side and a second reflecting surface oriented to be orthogonal to the first reflecting surface, and configured to reflect a reflected light from the first reflecting surface toward the first surface side.
Data Source
AI summary
An image display device includes an imaging element, a light source, a detecting part, and a controller. The imaging element includes a base member including a first surface, and a reflector array on the base member. The reflector array includes multiple reflector rows, each including multiple dihedral corner reflectors along a first direction. The multiple reflector rows are arranged parallel to a second direction crossing the first direction. The multiple dihedral corner reflectors each include a first reflecting surface, and a second reflecting surface orthogonal to the first reflecting surface. A tilt of a second orthogonal reflector is set to form a floating image at the first surface side. The light-transmitting member is arranged to transmit twice-reflected light of the imaging element. The light-shielding member shields a portion of light other than the twice-reflected light.