Holographic 3D Display Using Collimated Directional Backlight
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Solution Overview
Problem
Current holographic 3D display technologies face challenges in providing a realistic, non-fatiguing viewing experience with high viewing angles, often requiring large amounts of data and complex pixel arrangements.
Innovation Solution
A holographic 3D image generating apparatus utilizing a collimated directional backlight unit (CD BLU), a convergent lens, and a spatial light modulator (SLM) to adjust the emitting angle of collimated light, creating a focused beam through spatially-varying modulation, and an eye-tracking system to optimize the viewing window for the viewer's location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a holographic 3D display apparatus uses a great amount of data and significantly small pixel pitch to increase viewing angle, then the viewing angle is improved, but the device complexity and data requirements increase
Solution Approach 1:
The patent changes the parameter of light emission from conventional omnidirectional or wide-angle emission to collimated directional emission with controlled emitting angles. This parameter change allows the system to achieve high viewing angles through directional control rather than requiring complex pixel arrangements or large data amounts, thus resolving the contradiction between viewing angle and device complexity
Solution Approach 2:
The patent replaces conventional mechanical/optical display systems with a holographic system that uses collimated directional light and spatial light modulation. This substitution enables the system to achieve high viewing angles through holographic reconstruction principles rather than relying on complex pixel pitch arrangements, reducing overall device complexity
2Illumination intensity
If the holographic 3D display apparatus uses conventional backlight units, then the structure is simple, but the luminance and viewing angle performance are insufficient
Solution Approach 1:
The patent introduces a collimated directional backlight unit that changes the light emission parameters from conventional wide-angle or omnidirectional emission to collimated directional emission with controllable emitting angles. This parameter change enables high luminance output while maintaining manageable structural complexity through the use of collimating optics and angular control mechanisms
Solution Approach 2:
The patent employs a collimated directional backlight unit with adjustable emitting angles, allowing the system to dynamically adapt the light emission direction based on viewer position. This dynamic capability enables the system to maintain high luminance and optimize viewing performance without requiring overly complex static structural arrangements
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 solution enables a realistic, non-fatiguing 3D viewing experience with improved viewing angles and reduced data requirements, providing a high-luminance holographic image without visual fatigue.
Implementation Method 1
a collimated directional backlight unit (CD BLU) to output a first collimated light
Implementation Method 2
a convergent lens to enable the first collimated light to converge into a viewing area of a viewer
Implementation Method 3
a spatial light modulator (SLM) to display a holographic image pattern obtained by combining diffractive lenses, and the SLM performs spatially-varying modulation with respect to the first collimated light converging into the viewing area to generate a focused beam
Implementation Method 4
a holographic image pattern obtained by combining diffractive lenses
Implementation Method 5
a collimated light deflection device to deflect a second collimated light to output a third collimated light, and the collimated light deflection device may adjust an incident angle of the third collimated light to the pattern BLU by changing a shape or a spatial-location of the collimated light deflection device
Data Source
AI summary
A holographic three-dimensional (3D) image generating apparatus that may use a collimated directional backlight unit (CD BLU) is provided. The CD BLU may output a collimated light of which an emitting light is adjusted. The convergent lens may enable the outputted collimated light to converge into a viewing area of a viewer and thus, a viewing window may be generated. A spatial light modulator (SLM) may perform spatially-varying modulation with respect to the collimated light converging into the viewing area to generate a focused beam.