Light Field Display Using Equivalent Optical Model
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Solution Overview
Problem
Current light field display technologies often result in inaccurate image representation due to the mismatch between the pinhole imaging model and the actual light field device, leading to image blur and user discomfort in virtual reality experiences.
Innovation Solution
A light field display apparatus and method that employs an equivalent optical model, including a display, lens array, polarization selection device, light shifting device, and computing device, to accurately convert depth information into a light field image signal, improving image quality and resolution by considering the optical system's specific components and their interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pinhole imaging model is used to convert images for light field display, then the calculation process is simple, but the image quality deteriorates due to mismatch with actual optical system
Solution Approach 1:
The patent changes the imaging model parameters from a simple pinhole model to a more accurate optical model that accounts for lens characteristics, focal length, and optical path. This parameter change enables precise calculation of light field image signals that match the actual optical system, resolving the contradiction between calculation simplicity and image quality.
2Device complexity
If virtual reality displays use flat images at fixed distance, then the display structure is simple, but user comfort deteriorates due to focus-distance mismatch
Solution Approach 1:
The patent transitions from displaying only 2D flat images to generating 4D light field images that encode depth information and viewing angle. By adding dimensional information about light ray directions and depths, the system enables the human eye to focus at different virtual distances, eliminating the focus-distance mismatch that causes user discomfort.
3Manufacturing precision
If light field display provides all light information including depth and direction, then image realism is improved, but system complexity increases
Solution Approach 1:
The patent replaces complex mechanical optical systems with a computational approach. Instead of using multiple physical displays or complex optical components to generate light field images, the system uses a computing device to calculate and process image signals that encode depth and directional information, which are then rendered by a single display through the optical system.
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 solution enables users to experience images with favorable quality and improved resolution, reducing image blur and enhancing the realism of virtual reality by accurately simulating depth information through the equivalent optical model and polarization manipulation.
Implementation Method 1
The lens array is disposed on a transmission path of the light field image beam and located between the display and the projection target
Implementation Method 2
The polarization selection device is disposed between the polarizer and the lens array
Data Source
AI summary
A light field display apparatus includes a display, a lens array, a plurality of optical devices, and a computing device. The display emits a light field image beam to a projection target. The lens array is disposed on a transmission path of the light field image beam and located between the display and the projection target. The optical devices are disposed on the transmission path of the light field image beam. The computing device is electrically connected to the display to receive an image signal having depth information and convert the image signal having the depth information into a light field image signal. The light field image signal is transmitted to the display. The computing device converts the image signal having the depth information into the light field image signal by an equivalent optical model. A light field display method is also provided.