Diffraction Optical Element Chromaticity Correction for Color Uniformity
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Solution Overview
Problem
Diffraction optical elements in eyeglass display devices cause color unevenness due to varying diffraction efficiency across different wavelengths, leading to unsatisfactory color representation when displaying colors other than white.
Innovation Solution
A display device with a correction unit that adjusts the chromaticity range of the original image, using a first diffraction optical element to deflect image light, ensuring that the chromaticity range at one angle is aligned with that at a second, larger angle, thereby minimizing color unevenness through look-up tables (LUTs) for each position in the light-guiding system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a diffraction optical element is used to deflect light in the optical system, then the light traveling direction can be changed effectively, but color unevenness is caused due to varying diffraction efficiency for different wavelengths
Solution Approach 1:
The correction unit performs preliminary color correction on the image data before it is displayed, adjusting the chromaticity range at different positions to compensate for the color unevenness that will occur during diffraction. This advance correction ensures that even though the diffraction optical element causes wavelength-dependent deflection, the final displayed image maintains color uniformity across different viewing angles.
2Manufacturing precision
If the chromaticity range is limited at positions corresponding to light entering at smaller angles, then color unevenness is suppressed, but the chromaticity range of the original image is altered
Solution Approach 1:
The correction unit changes the chromaticity parameters of the image data at different positions based on the diffraction optical element's characteristics. By adjusting the chromaticity range according to the incident angle and position, the system compensates for the color shifts caused by diffraction while preserving the overall color accuracy of the displayed 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
The solution effectively suppresses color unevenness across different angles of view, ensuring consistent color representation by optimizing diffraction efficiency and chromaticity range alignment, thereby enhancing the display quality of colors beyond white.
Implementation Method 1
a first diffraction optical element configured to deflect a traveling direction of the image light toward an observer in the optical system
Implementation Method 2
in the light-guiding unit, incident light is guided by repeating total reflection inside the light-guiding unit
Data Source
AI summary
Provided is a display method for displaying an image based on a color original image. The display method includes guiding an image light corresponding to the color original image to a display position by an optical system, and deflecting a traveling direction of the image light to an observer and performing display by a diffraction optical element. At the time of displaying the color original image, the image light entering the first diffraction optical element includes a light entering at a first angle and a light entering at a second angle that is larger than the first angle, a chromaticity range of the image of the color original image at a position corresponding to the light entering at the first angle is limited to be close to a chromaticity range of the light entering at the second angle.