Holographic Display Steerable Viewing Window
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Solution Overview
Problem
Current 3D image display methods, including holographic displays, face challenges in maintaining consistent depth perception with the observer's eye focus, especially when the observer's location changes, leading to potential eye damage and impaired image appreciation due to misalignment of the viewing window.
Innovation Solution
A holographic display apparatus comprising a light source, spatial light modulator, lens, retroreflective mirror, spatial filter, and eye tracker, where the controller adjusts the light source and spatial filter locations in response to the observer's pupil position, ensuring the viewing window aligns with the observer's location, preventing diffracted light from hitting the eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the viewing window location is adjusted according to observer location, then 3D image appreciation is improved, but diffracted light may incident on observer's eyes causing damage
Solution Approach 1:
The patent introduces a controller as an intermediary that receives observer location information and automatically adjusts the viewing window location accordingly. This mediator coordinates the relationship between observer position and viewing window position, ensuring that the viewing window remains properly aligned with the observer's eyes while preventing diffracted light from reaching them. The controller acts as the mediating system that resolves the contradiction between adaptability and safety.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors observer location and adjusts the viewing window position in real-time based on this information. The controller receives location data and automatically modifies the viewing window location to maintain proper alignment, creating a closed-loop control system that adapts to changing observer positions while preventing harmful light exposure.
2Device complexity
If the viewing window location is fixed, then device complexity is reduced, but depth perception consistency deteriorates when observer location changes
Solution Approach 1:
The patent transforms the viewing window from a static, fixed-position component to a dynamic element that can automatically adjust its location based on observer position. The controller enables the viewing window to move and reposition itself in response to changing observer locations, maintaining consistent depth perception and image quality throughout the viewing area while managing system complexity through automated control.
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 ensures consistent and safe 3D image appreciation by synchronizing the viewing window with the observer's movement, preventing eye damage and maintaining clear image quality regardless of the observer's position.
Implementation Method 1
a lens configured to collimate light incident thereon from the light source and to focus the light incident thereon from the spatial light modulator
Implementation Method 2
a lens configured to collimate light incident thereon from the light source and to focus the light incident thereon from the spatial light modulator
Implementation Method 3
a retroreflective mirror configured to reflect the collimated light incident thereon from the lens and thereby change a travel direction of the light by 180 degrees
Implementation Method 4
when reference light is irradiated onto a hologram pattern having recorded thereon an interference pattern obtained by interference between object light reflected from an original object and the reference light, the reference light is diffracted and an image of the original object is reproduced
Implementation Method 5
an interference pattern obtained by interference between object light reflected from an original object and the reference light
Implementation Method 6
a spatial filter configured to transmit only the holographic image
Data Source
AI summary
A holographic display apparatus capable of steering a location of a viewing window according to a location of an observer is disclosed. The holographic display apparatus includes a light source; a spatial light modulator configured to modulate incident light and thereby reproduce the holographic image; a spatial filter configured to transmit only the holographic image; an eye tracker configured to track a pupil location of an observer; and a controller configured to adjust locations of the light source and the spatial filter in response to a change in the pupil location of the observer received from the eye tracker. The controller is configured to move the light source and the spatial filter simultaneously in the same direction by the same distance.