Holographic Display Focus Modulation Optical System Chromatic Aberration
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Solution Overview
Problem
Holographic display devices experience chromatic aberration due to the use of color light, which deteriorates image quality and is not effectively addressed by existing technologies.
Innovation Solution
A focus modulation optical system that includes a variable focus lens and wavelength selective retarders to adjust the focal length based on the wavelength of incident light, ensuring that each color light is focused at the same position, thereby reducing or eliminating chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color light is used in holographic display devices, then the display quality and visual effectiveness are improved, but chromatic aberration occurs which deteriorates image quality
Solution Approach 1:
The patent employs a variable focus lens that can dynamically adjust its focal length to compensate for chromatic aberration. The lens changes its optical power in response to different wavelengths of light, allowing the system to maintain sharp focus across the visible spectrum despite using color light for high-quality display
Solution Approach 2:
The patent changes the focal length parameter of the optical system based on the wavelength of incident light. By modulating the focal length to match the chromatic properties of different colors, the system eliminates chromatic aberration while preserving the benefits of using color light for holographic display
2Device complexity
If a fixed focus lens is used, then the device structure is simple, but chromatic aberration cannot be corrected effectively
Solution Approach 1:
The patent transitions from a static fixed focus lens to a dynamic variable focus lens that can adjust its optical properties. This dynamic adjustment capability allows the lens to correct chromatic aberration for different wavelengths while maintaining a relatively simple overall device structure
Solution Approach 2:
The variable focus lens serves multiple functions: it acts as a standard focusing element for monochromatic light while simultaneously providing chromatic aberration correction for polychromatic color light. This multi-functionality eliminates the need for separate correction elements, balancing structural simplicity with optical performance
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 focus modulation optical system effectively corrects chromatic aberration by modulating the focal length according to the wavelength of the incident light, resulting in improved image quality by ensuring that red, green, and blue light are focused at the same position, thus enhancing the display of holographic images.
Implementation Method 1
chromatic aberration occurs as color light is used
Implementation Method 2
wavelength selective retarders to adjust the focal length based on the wavelength of incident light
Implementation Method 3
focus modulation optical system which may reduce chromatic aberration
Data Source
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AI summary
A holographic display device (100) having a focus modulation optical system (150,200) is disclosed. The holographic display device includes a light source (110) configured to emit a plurality of color lights, a focus modulation optical system including at least one variable focus lens (300) that is configured to change a focusing position of incident light by electrical control of the at least one variable focus lens based on a color of light incident on the variable focus lens, and a spatial light modulator (160) configured to form a holographic image by diffracting light output from the focus modulation optical system.