Holographic Image Spatial And Color Measurement With Optical Path Control
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Solution Overview
Problem
Conventional methods lack the ability to accurately measure the spatial and color implementation properties of holographic images produced by holographic display devices, particularly those using monochromatic light sources, as existing systems like the CIE coordinate system are inadequate for assessing color accuracy and spatial properties such as diffraction angles.
Innovation Solution
A spatial property measurement device comprising a light receiver, diffraction element, rotation element, and controller is used to analyze the arrangement and diffraction properties of a spatial light modulator, while a color implementation property measurement device adjusts optical paths and senses multiple wavelength bands to evaluate color rendition and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the CIE coordinate system is used to measure color in holographic images, then the measurement follows a standard method, but the measurement accuracy deteriorates because the system is based on standard light sources rather than monochromatic laser light
Solution Approach 1:
The patent changes the measurement parameters by using multiple wavelength bands (red, green, blue lasers with wavelengths of 635nm, 532nm, and 450nm) instead of a single standard light source. This allows the system to measure color implementation properties specifically for monochromatic holographic light, resolving the contradiction between measurement precision and adaptability to monochromatic light.
2Measurement precision
If a light receiver directly measures diffracted light without additional diffraction elements, then the device complexity is reduced, but the measurement precision of spatial properties deteriorates
Solution Approach 1:
The patent introduces a diffraction element as an intermediary component between the spatial light modulator and the light receiver. This element diffracts the already-diffracted light to separate different spatial frequencies, enabling precise measurement of spatial properties like diffraction angles and image depth without requiring complex direct measurement systems.
3Measurement precision
If the light receiver is fixed at a single position, then the device complexity is minimized, but the measurement precision of spatial properties deteriorates due to inability to capture angular information
Solution Approach 1:
The patent makes the light receiver dynamic by enabling it to rotate around the diffraction element and change its position along the optical axis. This dynamic positioning allows the receiver to capture light at different angles and distances, providing precise spatial property measurements without requiring a fully complex multi-dimensional measurement system.
4Measurement precision
If multiple wavelength bands are measured simultaneously without optical path adjustment, then the measurement process is simplified, but the measurement precision of color properties deteriorates due to wavelength-dependent diffraction
Solution Approach 1:
The patent applies preliminary action by adjusting the optical path for each wavelength band before measurement. The system pre-adjusts the optical path based on the wavelength-dependent diffraction characteristics, ensuring that each color (red, green, blue) is measured at its optimal detection position, thereby achieving high color measurement precision.
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
Enables objective measurement of spatial and color properties of holographic images, ensuring accurate reproduction and identifying abnormalities in the display device components.
Implementation Method 1
a diffraction element disposed in front of the light receiver in a direction in which the light diffracted from the spatial light modulator is incident and re-diffracting the light diffracted from the spatial light modulator
Implementation Method 2
a light receiver receiving and sensing light output from a light source within the holographic display device and diffracted from a spatial light modulator within the holographic display device
Implementation Method 3
a rotation element fixed within a predetermined range from the spatial light modulator at one end and fixed to the light receiver at the other end to rotate the light receiver and adjusting a distance between the light receiver and the spatial light modulator
Data Source
AI summary
Disclosed is a color implementation property measurement device of holographic images. According to an aspect of the present embodiment, a color implementation property measurement device of a holographic image reproduced by a holographic display device is provided. The color implementation property measurement device includes an optical path adjustment unit configured to adjust the path of each light of different wavelength bands, a light receiver configured to receive and sense a plurality of lights having different wavelength bands, a diffraction element disposed in front of the light receiver in a direction, a rotation element fixed within a predetermined range from the spatial light modulator at one end, and a controller configured to adjust the rotation angle of the rotation element and the distance between the light receiver and the spatial light modulator and analyze the sensed value by the light receiver.