Light Modulator Device for 3D Display Observer Window Control
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Solution Overview
Problem
Existing 3D displays, such as holographic and autostereoscopic displays, face challenges in maintaining an optimal observer window size at varying eye positions, leading to incomplete 3D perception and cross-talking between observer windows, and require additional optical components for mode switching between 3D and 2D modes.
Innovation Solution
A light modulator device with a controllable spatial light modulator and diffraction device, utilizing a diffraction grating with encoded phase shifts and functions (prism, lens, and diffusion) to adjust the observer window size and mode adaptively, eliminating the need for additional optical elements like switchable diffusers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the observer window size is increased to cover both eyes in 2D mode, then the 2D viewing capability is improved, but the 3D perception quality deteriorates due to cross-talking between observer windows
Solution Approach 1:
The patent implements dynamic control of the diffraction grating parameters to adjust the observer window size based on the display mode. In 3D mode, the grating parameters are optimized for precise, smaller observer windows to prevent cross-talking. In 2D mode, the parameters are dynamically adjusted to create larger observer windows that cover both eyes, enabling versatile viewing while maintaining quality in each specific mode.
Solution Approach 2:
The invention changes the physical parameters of the diffraction grating (such as grating period, orientation, or phase modulation) to control the size and position of observer windows. By varying these parameters, the system can switch between 3D and 2D modes, creating appropriately sized windows for each mode without physical reconfiguration.
2Adaptability or versatility
If additional optical components like switchable diffusers are added for mode switching, then the adaptability between 3D and 2D modes is improved, but the device complexity increases
Solution Approach 1:
The diffraction grating serves multiple functions: it creates observer windows for 3D viewing, enables 2D viewing by adjusting its parameters, and provides the switching mechanism between modes. This multi-functional approach eliminates the need for separate switchable diffusers or additional optical components, reducing device complexity while maintaining adaptability.
Solution Approach 2:
The invention merges the mode switching function with the observer window generation function by using the diffraction grating parameters control. Instead of having separate components for mode switching and window generation, both functions are combined into a single parameter-controlled mechanism, simplifying the overall device architecture.
3Manufacturing precision
If the observer window size is decreased to prevent cross-talking in 3D mode, then the 3D perception quality is improved, but the 2D viewing capability deteriorates as the window becomes too small to cover both eyes
Solution Approach 1:
The system dynamically adjusts the diffraction grating parameters based on the detected display mode. When in 3D mode, the parameters create smaller, precise observer windows to eliminate cross-talking. When switching to 2D mode, the parameters are dynamically changed to expand the observer window size to cover both eyes, ensuring optimal viewing capability for each mode.
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
Enables consistent 3D perception across varying eye positions without cross-talking and allows seamless switching between 3D and 2D modes with reduced optical components, maintaining an optimal observer window size and reducing complexity and cost.
Implementation Method 1
A light modulator device with a controllable spatial light modulator and diffraction device, utilizing a diffraction grating with encoded phase shifts and functions (prism, lens, and diffusion) to adjust the observer window size and mode adaptively
Implementation Method 2
utilizing a diffraction grating with encoded phase shifts and functions (prism, lens, and diffusion) to adjust the observer window size and mode adaptively
Data Source
AI summary
A display comprising an observer window, which in 3D and/or 2D representation mode of a 3D scene can be adapted to changing eye positions. Several observers can use the display simultaneously. The display includes a light modulation device having an actuatable diffraction unit and a controllable spatial light modulator, in which a 3D scene is coded in an actuatable manner, and a control unit. An observer window can be generated using coherent light beams on alternating eye positions. The diffraction unit includes at least electrodes and a controllable material into which a prism and/or lens function and/or scatter function can be written as a diffraction grating with a phase progression in an at least one-dimensionally controllable manner.