Light Field Display Device with Liquid Crystal Lens Arrays
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Solution Overview
Problem
Current light field display technologies face challenges in achieving high refresh rates and reducing response time requirements, particularly in displaying images with multiple depths of field, which is difficult with conventional liquid crystal technologies.
Innovation Solution
The use of a light field display device with multiple imaging modules, each equipped with a liquid crystal lens array and a display screen, where the liquid crystal lens arrays have varying focal lengths to generate multiple virtual images, allowing for adjustable depth of field and reduced refresh rate requirements, and optionally incorporating a transflective film or Polarization Beam Splitter prism to enhance image parallelism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional liquid crystal technology is used for light field display, then the display can show images with multiple depths of field, but the refresh rate is low and response time is long
Solution Approach 1:
The display system is divided into multiple imaging modules, each responsible for a specific depth of field. Each module includes a liquid crystal lens array with specific focal length and a display screen. This segmentation allows parallel processing of multiple depth layers, achieving high refresh rates while maintaining multi-depth-of-field capability.
Solution Approach 2:
The patent transitions from single-plane 2D display to multi-plane 3D light field display by adding the depth dimension. Multiple imaging modules are arranged in space with different focal lengths, creating virtual images at different depths. This dimensional expansion enables simultaneous display of multiple depth of field images with high refresh rates.
2Adaptability or versatility
If multiple imaging modules are used to display images with multiple depths of field, then the depth of field capability is improved, but the device complexity increases
Solution Approach 1:
The complex light field display system is segmented into multiple independent imaging modules. Each module contains a liquid crystal lens array and display screen configured for a specific focal length. This modular segmentation makes the complex system manageable, with each module being independently controllable and replaceable, thus reducing overall system complexity while maintaining multi-depth capability.
Solution Approach 2:
The patent varies the focal length parameter of liquid crystal lens arrays across different imaging modules to achieve different depth of field effects. By changing this key optical parameter rather than redesigning the entire optical system, the patent achieves multi-depth capability with relatively simple structural modifications, thereby managing device complexity.
3Loss of time
If the refresh rate is reduced to lower response time requirements, then the response time requirement is reduced, but the image quality and realism may be affected
Solution Approach 1:
By segmenting the display into multiple imaging modules that can be updated independently, the system achieves effective high refresh rates for each depth layer. This segmentation allows the overall system to maintain high temporal resolution despite reduced individual module refresh rates, preserving image quality and realism while reducing response time requirements.
Solution Approach 2:
The patent creates multiple virtual image copies at different depths through the array of imaging modules. Each module generates a copy of the scene at a specific depth plane. This copying approach allows the system to display high-quality 3D images with reduced refresh rate requirements, as the human visual system integrates these copies into a coherent realistic image.
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 configuration reduces the refresh frequency and response time requirements by up to 50%, enabling the display of high-quality, realistic 3D images with adjustable depth of field without the need for glasses, breaking distance limitations of traditional naked-eye 3D displays.
Implementation Method 1
each of the imaging modules includes a liquid crystal lens array and a display screen, the liquid crystal lens array is disposed on a light exit side of the display screen
Implementation Method 2
a first liquid crystal lens array of the first imaging module and a second liquid crystal lens array of the second imaging module have equal number of focal lengths
Implementation Method 3
the transflective film is used to make images of the first imaging module and images of the second imaging module parallel to each other
Implementation Method 4
the PBS polarization beam splitter prism is used to make images of the first imaging module and images of the second imaging module parallel to each other
Data Source
AI summary
The present disclosure provides a light field display device. The light field display device includes a plurality of imaging modules. Each of the imaging modules includes a liquid crystal lens array and a display screen, the liquid crystal lens array is disposed on a light exit side of the display screen, and images of the plurality of imaging modules are parallel to each other.