Diffractive Optical Element Viewpoint Distortion Correction
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Solution Overview
Problem
Existing image display systems face challenges in reducing distortion and changes in the display state of virtual images when the observer's viewpoint position changes, leading to issues with display position, luminance, and chromaticity.
Innovation Solution
An image display apparatus comprising an emission unit, a diffractive optical element, and an emission control unit that uses image data to control the emission of image light, correcting changes in the display state based on viewpoint position changes, including changes in display position, luminance, and chromaticity, through image processing aligned with the optical properties of the diffractive optical element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective hologram is used to display a virtual image, then the virtual image can be displayed, but the virtual image becomes distorted when the observer moves from the normal observation position
Solution Approach 1:
The emission control unit performs preliminary correction on the image data before it is displayed. By predicting the distortion that will occur based on the optical properties of the reflective hologram and applying reverse distortion to the image data in advance, the system ensures that the virtual image remains undistorted even when observed from different positions. This preliminary correction approach prevents the distortion problem rather than correcting it after occurrence.
2Adaptability or versatility
If the observer moves to different viewpoint positions, then different perspectives of the virtual image can be observed, but the display state changes including position, luminance, and chromaticity
Solution Approach 1:
The emission control unit incorporates feedback mechanisms by detecting the observer's viewpoint position and dynamically adjusting the image data accordingly. The system uses the optical properties of the reflective hologram to predict how the image will appear from different positions and applies real-time corrections to maintain consistent display state. This feedback loop ensures that the virtual image maintains stable position, luminance, and chromaticity across multiple viewpoint positions.
Solution Approach 2:
The system changes the parameters of the image data based on the detected viewpoint position. By adjusting parameters such as image position, brightness, and color values in response to viewpoint changes, the emission control unit compensates for the natural distortion and state changes that occur in holographic displays. This dynamic parameter adjustment maintains display state consistency while allowing viewpoint flexibility.
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 effectively reduces distortion and maintains a consistent display state of virtual images across different viewpoint positions, enhancing the viewing experience by stabilizing image position, luminance, and color tone.
Implementation Method 1
The diffractive optical element includes an incident surface and an emission surface, diffracts the image light entering the incident surface, and emits the image light from the emission surface
Data Source
AI summary
It is an objective of the invention of the present application to provide an image display apparatus capable of reducing a change in a display state of a virtual image that depends on a change in a viewpoint position. An image display apparatus according to an embodiment of the present technology includes an emission unit, a diffractive optical element, and an emission control unit. The emission unit emits image light of a target image. The diffractive optical element includes an incident surface and an emission surface, diffracts the image light entering the incident surface, emits the image light from the emission surface, and displays a virtual image that is the target image. The emission control unit controls emission of the image light by the emission unit by using image data generated in accordance with a change in a display state of the virtual image that depends on a change in a viewpoint position.