Slim Backlight Unit for Binocular Holographic Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 3D image display methods, such as stereoscopic techniques, often result in viewer fatigue due to discrepancies between perceived depth and focus, as they rely on limited viewpoints and require high-resolution spatial light modulators and substantial data processing, which is impractical for widespread use.
Innovation Solution
A slim backlight unit for binocular-holographic display devices that includes a light source unit, beam expansion units with light guide plates, and a beam deflection unit to control light paths, allowing for the generation of hologram images with different viewpoints for each eye, reducing data processing requirements and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a very high resolution spatial light modulator is used to implement perfect holographic display, then image quality is improved, but device complexity and data processing requirements increase significantly
Solution Approach 1:
The patent segments the holographic display into two separate channels: a first spatial light modulator for the first wavelength and a second spatial light modulator for the second wavelength. This segmentation allows each modulator to operate at lower resolution requirements while collectively achieving full-color holographic display, thereby reducing device complexity and data processing demands while maintaining image quality.
Solution Approach 2:
The patent introduces a wavelength dimension by using multiple spatial light modulators operating at different wavelengths (colors) simultaneously. Instead of requiring one extremely high-resolution modulator, the system uses multiple lower-resolution modulators in the wavelength domain, effectively trading spatial resolution for spectral diversity to reduce overall device complexity.
2Measurement precision
If a very high resolution spatial light modulator is used to implement perfect holographic display, then image quality is improved, but data processing amount increases significantly
Solution Approach 1:
The patent divides the data processing workload by segmenting it across multiple spatial light modulators operating at different wavelengths. Each modulator processes a portion of the holographic data for its specific wavelength channel, significantly reducing the data processing amount required for each individual modulator while collectively achieving complete color holographic display with high image quality.
3Manufacturing precision
If beam expansion units and light guide plates are added to control light paths, then light control precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces light guide plates as intermediary components between the light sources and the spatial light modulators. These light guide plates serve as mediators to precisely control and direct the light paths for different wavelengths to their respective modulators, improving light control precision while distributing the complexity across specialized optical components rather than requiring a single complex system.
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 the creation of high-quality, fatigue-free 3D images by providing full parallax and reducing data processing needs, making holographic displays more feasible and efficient.
Implementation Method 1
a first light guide plate transmitting light in the first direction
Implementation Method 2
the beam deflection unit being configured to two-dimensionally control a path of the light incident thereon
Implementation Method 3
the reference light is diffracted and an image of the original object is reproduced
Data Source
AI summary
A backlight unit for a binocular-holographic display device and a holographic display device including the same are provided. The backlight unit includes a light source unit which outputs light, a first beam expansion unit which expands, in a first direction, the light output from the light source unit, a second beam expansion unit which expands, in a second direction perpendicular to the first direction, the light output from the first beam expansion unit, and a beam deflection unit which diffracts light incident on the first beam expansion unit. The holographic display device includes the backlight unit, a field lens, and a spatial light modulator.