3D Laser Beam Scanning Display for Uniform Viewing Zones
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Solution Overview
Problem
Existing auto-stereoscopic 3D image display systems using projection optical systems face challenges in maintaining uniform viewing zone distribution and minimizing crosstalk, leading to viewer fatigue and limited depth perception, especially when displaying hundreds of viewpoints, due to non-uniform brightness and overlapping viewing zones.
Innovation Solution
The use of laser beam scanning (LBS) projection optical systems, where each system acts as a unit 3D pixel or pixel line, with beam-projection center points arranged at predetermined intervals and a screen with vertical and minor diffusion characteristics, allows for the formation of hundreds of viewpoint images with uniform light intensity and reduced crosstalk, enabling clear 3D image display without special glasses across a wider view range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional projection optical systems are used to display hundreds of viewpoints, then the number of viewpoints increases, but viewing zones become non-uniform and crosstalk increases
Solution Approach 1:
The system segments the projection function into multiple LBS projection optical systems arranged in a 2D array, where each system projects to a specific region of the screen. This segmentation allows independent control of each projection unit, enabling precise control over viewing zone distribution and reducing crosstalk between adjacent viewpoints.
Solution Approach 2:
The invention changes the projection method from conventional lens-based projection to laser beam scanning projection. This parameter change enables dynamic control of beam characteristics (position, intensity, shape) through scanning mirrors, allowing precise formation of viewing zones and uniform light intensity distribution across hundreds of viewpoints without the limitations of conventional optical systems.
2Ease of manufacture
If conventional projection optical systems are used, then projection can be achieved, but system complexity and alignment adjustment become excessive
Solution Approach 1:
The invention replaces conventional mechanical lens-based projection systems with laser beam scanning projection systems. This substitution eliminates the need for complex lens alignment and focal distance adjustments, as the laser beam can be precisely directed through scanning mirrors. The system becomes easier to manufacture and align since it relies on electronic control of beam position rather than mechanical adjustment of optical components.
3Area of stationary object
If viewing zones are increased to cover wider area, then more viewers can watch simultaneously, but crosstalk between adjacent zones increases
Solution Approach 1:
The system applies local quality by assigning different characteristics to different regions of the screen. Each LBS projection optical system projects to a specific local region with optimized beam parameters. The scanning mirrors and beam control mechanisms adjust the beam shape and position locally to create distinct viewing zones with minimal overlap, reducing crosstalk while maintaining wide overall coverage.
Solution Approach 2:
The laser beam scanning system uses periodic scanning motion of mirrors to sequentially illuminate different regions of the screen. This periodic action allows precise temporal and spatial control of light distribution, creating well-defined viewing zones that are updated continuously. The scanning synchronization ensures that each region receives light only when intended, minimizing crosstalk between adjacent zones.
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 configuration relaxes spatial and size limitations, provides clear 3D images with reduced crosstalk and improved depth perception, allowing multiple viewers to experience a natural 3D image during movement, while minimizing the complexity of adjusting projection distances and system alignment.
Implementation Method 1
Each of many laser beam scanning (LBS) projection optical systems horizontally and vertically arranged in a two-dimensional (2D) array
Implementation Method 2
a screen with vertical and minor diffusion characteristics
Data Source
AI summary
Provided is a three-dimensional (3D) image display apparatus using laser beam scanning (LBS) projection optical systems. The 3D image display apparatus includes a plurality of LBS projection optical systems arrayed in horizontal and vertical directions, an input unit through which a 3D image signal is input, and an image signal controller configured to distribute the 3D image signal input through the input unit to the LBS projection optical systems. Each of the arrayed LBS projection optical systems has a beam-projection center point for outputting light to an outside of the LBS projection optical system, and an image projected from the beam-projection center point is a horizontal-parallax image based on the beam-projection center point.