Holographic Display Color Shift Compensation via RGB Intensity Adjustment
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Solution Overview
Problem
Holographic display devices experience color shift due to differing diffraction efficiencies of multiple colors of light, leading to distortion of three-dimensional holographic images.
Innovation Solution
The holographic display device employs a diffraction component with multiple diffraction groups and an optical waveguide to adjust the intensities of red, green, and blue light emissions from the display panel, ensuring they are proportional to their respective diffraction efficiencies, thereby maintaining equal intensities in the diffracted light and reducing color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple colors of light are used to generate holographic images, then the holographic images can display full color, but the diffraction efficiencies of different colors are different causing color shift
Solution Approach 1:
The patent applies local quality by assigning different grayscale values to different color channels (RGB) based on their specific diffraction efficiencies. Each color is processed differently in the pre-processing stage, with compensation factors applied locally to each color's pixel data to balance their intensities after diffraction, thereby eliminating color shift while maintaining full-color display capability
Solution Approach 2:
The patent changes the parameter of grayscale values for different color lights to compensate for diffraction efficiency differences. By adjusting the intensity parameters of RGB lights before they enter the holographic display system, the patent ensures that lights with lower diffraction efficiency receive higher initial intensity, while lights with higher efficiency receive lower intensity, resulting in balanced output intensities and accurate color reproduction
2Manufacturing precision
If the intensities of multiple colors of light are adjusted to compensate for diffraction efficiency differences, then color shift is reduced, but the complexity of the display system increases
Solution Approach 1:
The patent implements preliminary action by performing intensity compensation during the image pre-processing stage, before the light actually passes through the holographic display system. The system calculates and applies the necessary grayscale adjustments to RGB channels in advance, based on pre-determined diffraction efficiency characteristics, so that no additional complex hardware or real-time adjustment mechanisms are needed during actual display operation
Solution Approach 2:
The patent introduces an intermediary processing layer between the input image and the holographic display system. This intermediary module performs the intensity compensation calculations and generates adjusted grayscale values for each color channel, acting as a mediator that translates the raw image data into compensated data without requiring direct modification of the physical display components
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 approach ensures that the holographic images displayed have consistent intensities for all colors, minimizing color shift and maintaining image quality.
Implementation Method 1
The display panel is configured to emit a first image light L1 for displaying two-dimensional images
Implementation Method 2
The diffraction component 30 is configured to diffract the first image light L1 into a second image light
Implementation Method 3
An optical waveguide 40 is a light propagation medium on an optical path of the first image light L1
Data Source
AI summary
A holographic display device includes a display panel for emitting a first image light and a diffraction component on an optical path of the first image light. The first image light includes first and second colors of light. The diffraction component diffracts the first color light at a first diffraction efficiency and diffracts the second color light at a second diffraction efficiency. The first color light and the second color light after diffraction are mixed together in a second image light for generating holographic images. By emitting the first color light and the second color light in the first image light at the same grayscale value, a ratio of intensities of the first color light and the second color light becomes inversely proportional to a ratio of the first diffraction efficiency and the second diffraction efficiency.