3D Image Display Using Volume Diffractive Element
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Solution Overview
Problem
Current methods for displaying three-dimensional images, such as holography and stereoscopy, face limitations in achieving both horizontal and vertical parallax, and three-dimensional scanning methods are costly or require complex equipment.
Innovation Solution
An apparatus and method utilizing a volume diffractive element for one-dimensional optical modulation in the propagating direction combined with two-dimensional scanning, enabling the formation of spots at different positions to display three-dimensional images by modulating beams from a light source array and driving the light source array and volume diffractive element in specific directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holography method is used to display three-dimensional images, then a three-dimensional image can be formed using interference fringes, but a coherent light source is required and it is difficult to record/reproduce large objects located far away
Solution Approach 1:
The invention divides the light source into multiple independent light sources arranged in an array, where each light source corresponds to a specific depth position. This segmentation allows independent control of each light source to achieve optical modulation in the depth direction without requiring complex coherent light sources or recording systems.
Solution Approach 2:
The invention changes the spatial arrangement parameter of light sources from a single coherent source to a multi-source array configuration. By controlling the emission intensity of each light source individually, the system achieves optical modulation in the propagating direction, resolving the contradiction between image formation capability and device complexity.
2Adaptability or versatility
If stereoscopy method is used to display three-dimensional images, then two two-dimensional images with binocular parallax can be viewed by both eyes, but only horizontal parallax is provided and vertical parallax cannot be realized
Solution Approach 1:
The invention extends the parallax capability from two dimensions (horizontal only in stereoscopy) to three dimensions by adding vertical parallax through optical modulation in the propagating direction. The multi-source light array enables independent intensity control along the depth axis, achieving full 3D parallax without increasing device complexity.
3Speed
If three-dimensional scanning method using two-dimensional spatial light modulator is used, then high-speed scanning can be performed, but fabrication costs increase
Solution Approach 1:
The invention replaces the expensive two-dimensional spatial light modulator with a segmented light source array where each light source can be independently controlled. This segmentation maintains high-speed scanning capability while using simpler, more cost-effective components that are easier to manufacture.
Solution Approach 2:
The invention uses multiple independent light sources as simple copies instead of a complex spatial light modulator. Each light source in the array serves as an independent emitting element that can be controlled individually, achieving the same scanning function at lower fabrication cost.
4Ease of manufacture
If point scanning method is used to display three-dimensional images, then inexpensive equipment and simple structure are required, but one-dimensional optical modulation in beam propagating direction cannot be realized
Solution Approach 1:
The invention introduces a segmented light source array where each light source corresponds to a specific depth position. This simple segmentation enables one-dimensional optical modulation in the beam propagating direction while maintaining the equipment simplicity and low cost characteristics of point scanning methods.
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 approach allows for efficient and cost-effective display of three-dimensional images with improved optical efficiency and contrast, enabling wide bandwidth for moving pictures while maintaining simplicity and affordability.
Implementation Method 1
a volume diffractive element diffracting beams emitted from the light sources so that spots of the beams can be formed at different positions from each other in a propagating direction of the beams diffracted by the volume diffractive element
Data Source
AI summary
The apparatus includes a light source unit and a volume diffractive element diffracting beams emitted from the light sources unit so that spots of the beams can be formed at different positions from each other in a propagating direction of the beams diffracted by the volume diffractive element to scan the beams in a first direction.