Two-Stage Beam Deflector for Holographic 3D Display Crosstalk
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Solution Overview
Problem
Holographic displays face challenges in delivering a stereoscopic image without causing image noise, as existing beam deflectors often result in crosstalk, where both the holographic image and lattice spots are viewed by the observer, deteriorating image quality.
Innovation Solution
A beam deflector system comprising a first and second beam deflector with liquid crystals aligned parallel to their respective moving directions, along with a polarization converter, deflects incident light through two stages, ensuring the holographic image is oriented correctly and image noise is diverted, using a configuration of pattern electrodes and substrates to modulate light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single beam deflector is used to deliver holographic image to both eyes, then the device complexity is reduced, but image quality deteriorates due to crosstalk and lattice spots being viewed simultaneously
Solution Approach 1:
The single beam deflector is segmented into two separate beam deflectors (first beam deflector and second beam deflector) with different liquid crystal alignment directions. This segmentation allows each deflector to handle specific polarization components independently, preventing crosstalk between left and right eye images while eliminating lattice spots, thus resolving the contradiction between device simplicity and image quality.
2Device complexity
If liquid crystals are aligned perpendicular to the moving direction for beam deflection, then the beam deflection mechanism is simplified, but image noise cannot be effectively diverted
Solution Approach 1:
The first and second beam deflectors employ asymmetric liquid crystal alignment configurations relative to the moving direction. Specifically, the liquid crystals in the first beam deflector are aligned at a different angle than those in the second beam deflector, creating asymmetric optical paths that selectively direct the holographic image to both eyes while diverting image noise and lattice spots away from the observer's view.
3Device complexity
If conventional beam deflector configuration is used, then the polarization conversion requirements are minimized, but crosstalk occurs between stereoscopic images
Solution Approach 1:
A polarization converter is introduced as an intermediary component between the first and second beam deflectors. This polarization converter transforms the polarization state of light passing through the first beam deflector, enabling the second beam deflector to properly process the light for the second eye's image. This intermediary polarization conversion mechanism prevents crosstalk by ensuring that each eye receives only its intended image through controlled polarization states.
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 proposed beam deflector system effectively delivers a stereoscopic image to both eyes while deviating image noise, enhancing the observer's viewing experience by eliminating crosstalk and improving image quality.
Implementation Method 1
the first beam deflector including liquid crystals aligned such that long axes of the liquid crystals are parallel to the first moving direction when an electric field is not applied thereto, a second beam deflector including liquid crystals aligned such that long axes of the liquid crystals are parallel to the second moving direction when electric field is not applied thereto
Implementation Method 2
a polarization converter provided between the first beam deflector and the second beam deflector and configured to convert polarization of the light incident to the second beam deflector
Implementation Method 3
a first electrode layer including the plurality of first pattern electrodes on a first substrate, a second electrode layer used as a common electrode on a second substrate
Data Source
AI summary
A beam deflector and a holographic three-dimensional image display apparatus employing the same are provided. The beam deflector deflects light through two stages by a first beam deflector that deflects the light in a first moving direction making an angle with a horizontal direction and a vertical direction, such that the deflected light is oriented to a first location, and a second beam deflector that deflects the light incident from the first beam deflector such that the light is deflected in a second moving direction making an angle with the horizontal direction and the vertical direction at the first location and is oriented to a second location.