Holographic 3D Display Actuation for Wide Viewing Angles
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Solution Overview
Problem
Holographic 3D display screens face challenges in maintaining effective image deflection over a wide user movement range, as the diffraction efficiency of liquid crystal gratings decreases at large viewing angles, limiting the display effect and user experience.
Innovation Solution
Incorporating an actuation device that moves or rotates the display module to compensate for the limited deflection range of the deflection device, allowing the image to be deflected in multiple directions and improving diffraction efficiency at wide viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the viewing angle range is increased to accommodate wide user movement, then the adaptability is improved, but the diffraction efficiency of the liquid crystal grating decreases
Solution Approach 1:
The patent applies the dynamics principle by introducing an actuation device that dynamically adjusts the display module's position and orientation. The display module can rotate and translate in real-time to compensate for the liquid crystal grating's limited deflection capability at large viewing angles, maintaining optimal diffraction efficiency across the entire viewing range while adapting to user movement.
2Adaptability or versatility
If multiple liquid crystal gratings are used to expand deflection range, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent applies the intermediary principle by introducing an actuation device as a mediator between the user's movement and the image display. This actuation device physically adjusts the display module's position and orientation to compensate for the liquid crystal grating's deflection limitations, eliminating the need for multiple gratings while maintaining wide deflection range and high diffraction efficiency.
3Adaptability or versatility
If the display module is mechanically adjusted to extend deflection range, then the adaptability is improved, but the preparation difficulty increases
Solution Approach 1:
The patent applies the universality principle by designing the actuation device to perform multiple functions: it adjusts both the position and orientation of the display module, compensates for viewing angle limitations, and maintains diffraction efficiency. This multi-functional approach simplifies the overall system compared to using multiple specialized liquid crystal gratings, reducing preparation difficulty while achieving extended deflection range.
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
Enhances the display effect by ensuring the image can be observed by the user over a wide range of movements and maintains high diffraction efficiency, reducing the need for multiple liquid crystal gratings and lowering power consumption.
Implementation Method 1
the diffraction efficiency of the liquid crystal grating is improved
Implementation Method 2
The actuation device is configured to move or rotate the display module to make the image move at least in a second direction
Data Source
AI summary
Provided are a display apparatus, a method for controlling a display apparatus, and a holographic three-dimensional (3D) display screen. The display apparatus includes a display module and an adjustment module. A deflection device of the display module is configured to make an image move at least in a first direction. An actuation device of the adjustment module is configured to move or rotate the display module so that the image moves at least in a second direction. The actuation device is added in the display apparatus. The deflection device is controlled to follow the movement direction of the human eye to make the image move in at least a part of the component directions of the movement direction of the human eye on the plane where the deflection device is disposed.