Holographic Display Light Separating Plate for Wide Viewing Angle
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Solution Overview
Problem
Current 3D image display methods, such as stereoscopic and auto-stereoscopic techniques, face limitations in increasing the number of viewpoints and can cause viewer fatigue due to mismatched depth perception and focal points, while holographic displays aim to provide matched depth and full parallax but are hindered by device size and viewing angle constraints.
Innovation Solution
A holographic display device with a compact design featuring a light source part, collimation lens, wave guide, spatial light modulator, focusing optical system, and a light separating plate, which includes an eye tracker and moving parts to adjust the light sources and separating plate based on observer gaze, allowing for a wide viewing angle and reduced device volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a holographic display device is designed with multiple light sources and optical components to achieve wide viewing angle, then the viewing angle is improved, but the device volume increases
Solution Approach 1:
The patent implements nesting by placing the first light source within the second light source structure, and positioning optical components such as the collimation lens and wave guide in concentric or overlapping arrangements. This nested configuration allows multiple optical paths to coexist in a compact volume, achieving wide viewing angle without proportional increase in device size
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by positioning light sources at different depths (first light source inside second light source), and arranging optical components along multiple axial directions. This dimensional utilization enables compact integration of multiple optical systems while maintaining separate optical paths for different viewing angles
Solution Approach 3:
The patent divides the optical system into distinct functional segments: first light source for central viewing angle, second light source for peripheral viewing angle, collimation lens for beam parallelization, and wave guide for light distribution. Each segment is optimized independently and integrated through precise spatial positioning, allowing compact arrangement while maintaining wide viewing angle performance
2Device complexity
If stereoscopic or auto-stereoscopic methods are used for 3D display, then the device complexity is reduced, but the depth perception and focal point mismatch causes viewer fatigue
Solution Approach 1:
The patent changes the optical parameters by using multiple light sources with different emission characteristics and positioning them at specific locations. The collimation lens adjusts the light beam parameters to achieve proper focusing, while the wave guide distributes light at controlled angles. These parameter adjustments enable the optical paths to converge at the correct focal points, matching depth perception and eliminating viewer fatigue
3Adaptability or versatility
If light sources are positioned to provide wide viewing angle, then the viewing angle is improved, but the light paths interfere with each other
Solution Approach 1:
The patent introduces the wave guide as an intermediary component between the light sources and the viewing area. The wave guide receives light from both the first and second light sources, separates their optical paths through internal structure, and distributes them at different angles. This intermediary structure enables wide viewing angle while maintaining stable light path separation and preventing interference
Solution Approach 2:
The patent employs asymmetric positioning of the first light source within the second light source structure, and asymmetric arrangement of the collimation lens and wave guide components. This asymmetric configuration creates distinct optical paths with different propagation directions, enabling wide viewing angle coverage while maintaining clear separation between light paths and preventing mutual interference
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 holographic display device with a small volume and wide viewing angle, enhancing the viewer's experience by maintaining matched depth perception and focal points, thus reducing fatigue and improving the overall 3D image display quality.
Implementation Method 1
a collimation lens that collimates light incident from the light source part
Implementation Method 2
a wave guide that guides and diffracts the light incident from the collimation lens
Implementation Method 3
the spatial light modulator may form a holographic pattern to diffract reference light, thereby generating a 3D image
Implementation Method 4
a holographic display device that may have a small volume and a wide viewing angle... a spatial light modulator that modulates the light passing through the wave guide so as to form a holographic pattern for reproducing a holographic image
Implementation Method 5
a light separating plate disposed between the light source part and the collimation lens, the light separating plate separating light of the first light source and light of the second light source from each other
Data Source
AI summary
A display device includes a light source part including a first light source and a second light source, a collimation lens that collimates light incident from the light source part, a wave guide that guides and diffracts the light incident from the collimation lens, a spatial light modulator that modulates the light passing through the wave guide so as to form a holographic pattern for reproducing a holographic image, a focusing optical system that focuses the holographic image on a space, and a light separating plate disposed between the light source part and the collimation lens, the light separating plate separating light of the first light source and light of the second light source from each other.