Stereoscopic Display Optical Device Segmentation Scanning
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Solution Overview
Problem
Conventional stereoscopic image display apparatuses face challenges in providing a wide viewing range due to crosstalk and the difficulty in designing screens with optimal scattering characteristics, leading to high costs and limited viewing fields.
Innovation Solution
A stereoscopic image display apparatus featuring an optical device with multiple regions for diffusing coherent light beams, a spatial light modulator, and a projection optical system that projects parallax images at different angles onto a single plane, allowing for a wider viewing field without the need for glasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plurality of light sources are arranged apart from one another to emit different parallax images, then the emitted-light angle range is widened, but the final angles of emitted light beams become largely different, making it difficult to find a stereoscopic-image viewable range
Solution Approach 1:
The optical device is divided into n regions corresponding to n parallax images, with each region having specific diffusion characteristics. This segmentation allows precise control of light beam angles from each region while maintaining a wide overall viewing field, resolving the contradiction between viewing field range and angle control precision.
Solution Approach 2:
Different regions of the optical device are given different diffusion characteristics tailored to their specific function. The first region has diffusion characteristics optimized for a specific viewing angle, while other regions have characteristics optimized for their respective parallax images, allowing precise angle control for each region while achieving a wide total viewing field.
2Object-affected harmful factors
If slight scattering characteristics are given to a screen to restrict emission angles, then crosstalk is reduced, but the scattering characteristics must be within an extremely narrow range, making design and production difficult and costly
Solution Approach 1:
The scattering function is extracted from the screen and transferred to the optical device's diffusion regions. By placing diffusion regions with specific scattering characteristics in the optical path before the screen, the screen itself can have simple, easy-to-manufacture scattering characteristics while still achieving effective crosstalk reduction through the combined optical system.
Solution Approach 2:
Diffusion regions are introduced as intermediary elements between the light sources and the screen. These intermediate diffusion regions control the emission angles and reduce crosstalk before the light reaches the screen, allowing the screen to have simple, easy-to-manufacture scattering characteristics without needing to achieve precise angle control alone.
3Adaptability or versatility
If multiple light sources are used to provide wide viewing angles, then the viewing field is expanded, but the device complexity and cost increase
Solution Approach 1:
Multiple light sources are merged into a single optical device with n regions that can be sequentially scanned by one coherent light source. This combining approach maintains the capability to display n different parallax images with wide viewing angles while reducing the number of independent light sources and associated optical components, thereby simplifying the overall device structure.
Solution Approach 2:
A single coherent light source is used to periodically scan through n regions of the optical device in sequence, with each region displaying a different parallax image. This periodic scanning action allows one light source to perform the function of multiple light sources, reducing device complexity while maintaining wide stereoscopic viewing capabilities.
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 enables a wider viewing field for stereoscopic images while maintaining a simple configuration, improving the efficiency of coherent light beam usage and reducing crosstalk, thus enhancing the viewer's experience without the need for glasses.
Implementation Method 1
an optical device having an n (n being an integer of 2 or more) number of regions provided corresponding to the n number of parallax images, respectively, each region being capable of diffusing a coherent light beam
Data Source
AI summary
A stereoscopic image display apparatus including: an optical device having an n (n≧2) number of regions provided corresponding to the n number of parallax images, respectively, each region being capable of diffusing a coherent light beam; an irradiation unit to irradiate the optical device with a coherent light beam to scan the n number of the regions; a spatial light modulator that is illuminated with a coherent light beam incident on each of positions of the optical device and then diffused, to generate a modulated image corresponding to each of the n number of regions, in sync with the scanning of the n number of regions with the coherent light beam; and a projection optical system to project the n number of parallax images generated by the modulated image onto one plane to superimpose the parallax images on one another on the one plane at different angles.