Flat Light Beam Path Control Apparatus for Holographic Displays
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Solution Overview
Problem
Conventional holographic displays face challenges with limited viewing angles and sizes, causing eye strain and dizziness due to parallax inconsistencies, and require bulky optical and mechanical systems, which are difficult to move and often use hazardous coherent light sources.
Innovation Solution
A flat light beam path control apparatus that uses a combination of light guide plates and gratings to expand and control coherent light beams, ensuring uniform intensity and minimal thickness, allowing for a compact and portable holographic display system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional holographic display systems are used, then stereoscopic images can be reproduced, but the system occupies large space and is difficult to move due to bulky optical and mechanical components
Solution Approach 1:
The patent combines multiple optical components (light guide plates, gratings, beam expanders) into a single integrated flat light beam path control apparatus. This merging of components achieves compactness while maintaining the functional requirements for holographic display illumination
Solution Approach 2:
The patent replaces traditional mechanical optical systems with a flat, integrated optical structure using light guide plates and gratings. This substitution eliminates bulky mechanical components while achieving the same light beam control functions
2Area of stationary object
If tiling structure is used to expand panel size, then display area increases, but joint boundary lines cause black lines in reproduced hologram worsening quality
Solution Approach 1:
The patent uses a single large-area light guide plate instead of tiled panels, eliminating the need for joints and boundary lines. This segmentation-free approach ensures uniform light distribution across the entire display area without quality degradation
3Illumination intensity
If coherent light source is used for holographic display, then sufficient intensity is achieved, but direct exposure to eyes is dangerous requiring additional safety devices
Solution Approach 1:
The patent uses light guide plates and gratings as intermediary optical elements that distribute and control coherent light. These intermediaries ensure uniform light intensity while preventing direct coherent light exposure to eyes, eliminating the need for additional safety devices
4Measurement precision
If conventional optical systems are used, then light beam control is achieved, but the system is optically precise and occupies large space
Solution Approach 1:
The patent uses thin light guide plates and flat grating structures instead of bulky optical components. These thin-film-like structures maintain optical precision while dramatically reducing system volume and enabling flat, portable designs
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 apparatus achieves a wide viewing angle and large display area with uniform light intensity, reducing eye strain and enabling a compact, portable holographic display system that can reproduce high-quality stereoscopic images without the need for additional devices.
Implementation Method 1
a first light guide plate on which a light beam output from a light source is incident, the light beam being incident on an entrance surface of the first light guide plate at a first incidence angle and being transmitted at a first transmittance angle
Implementation Method 2
a first grating configured to transmit the light beam incident on the first light guide plate into a second light guide plate, the light beam transmitted through the first grating being incident on a grating surface of the first grating at the first incidence angle corresponding to the first transmittance angle and being transmitted into the second light guide plate at a second transmittance angle
Implementation Method 3
the second light guide plate configured to pass the light beam transmitted through the first grating to be incident on a second grating, the light beam passing through the second light guide plate being determined on the second transmittance angle and a refractive index of the second light guide plate
Data Source
AI summary
The present invention relates to an apparatus for controlling a light beam path.Specifically, the apparatus for controlling the light beam path outputs light beams with a uniform intensity expanded corresponding to a size of an active area of a display by using characteristics of an incident wave field of light beams having coherence.