Hologram Printing Light Efficiency Map for Hogel Uniformity
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Solution Overview
Problem
Hologram media used in hologram printers lack precision in efficiency and uniformity, leading to inconsistent luminance and color quality due to manufacturing limitations and environmental factors.
Innovation Solution
A method and apparatus for hologram printing that utilize a light efficiency map to adjust the intensity of lasers by wavelength and area on a hologram medium, generating a light efficiency map from acquired images to ensure uniformity of luminance and color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hologram printing is performed using conventional hologram media without efficiency measurement, then the manufacturing process is simple, but the luminance uniformity and color accuracy across different hogel areas deteriorate
Solution Approach 1:
The patent applies preliminary action by measuring and creating a light efficiency map of the hologram medium before actual hologram printing. This pre-measurement step characterizes the luminance efficiency of each hogel area, allowing subsequent printing to compensate for medium non-uniformities and achieve consistent luminance and color across the entire hologram.
Solution Approach 2:
The patent applies parameter changes by adjusting the printing parameters (laser intensity, exposure time) based on the measured light efficiency map. Each hogel area receives customized printing parameters to compensate for its specific efficiency characteristics, transforming the uniform printing approach into a spatially varying parameter control strategy.
2Manufacturing precision
If hologram printing is performed without adjusting laser intensity per hogel area, then the printing process is fast and simple, but the color accuracy and luminance consistency deteriorate
Solution Approach 1:
The light efficiency map is generated in advance through preliminary measurement, storing the efficiency characteristics of each hogel area. This pre-computed map enables rapid lookup and parameter adjustment during actual printing, avoiding real-time measurements while maintaining color accuracy.
Solution Approach 2:
The patent applies local quality by assigning different laser intensities and exposure parameters to different hogel areas based on their specific efficiency characteristics. Each local region is optimized individually using the pre-measured efficiency data, ensuring accurate color reproduction while maintaining overall printing efficiency.
3Manufacturing precision
If light efficiency is measured and adjusted on each hogel basis, then luminance uniformity improves, but the measurement and processing time increases
Solution Approach 1:
The light efficiency measurement is performed as a preliminary one-time action to create a reusable efficiency map. This pre-characterization of the medium allows multiple subsequent hologram printings to benefit from the measured data without repeating the time-consuming measurement process for each print job.
Solution Approach 2:
The patent applies copying by using the measured light efficiency map as a reference model for multiple printing operations. The efficiency characteristics of each hogel area are copied and applied across different printing jobs, eliminating the need to remeasure the medium repeatedly while maintaining luminance uniformity.
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
Enhances the uniformity and accuracy of hologram printing results by measuring and adjusting light efficiency on each hogel area, mitigating issues of non-uniform color and luminance, and improving overall image quality.
Implementation Method 1
acquiring an image by photographing light diffracted from the hologram medium
Implementation Method 2
emitting a laser to a hologram medium
Data Source
AI summary
Provided is a hologram printing method and apparatus using a hologram medium light efficiency map. A hologram printing method according to an embodiment emits a laser to a hologram medium, acquires an image by photographing light diffracted from the hologram medium, generates a light efficiency map of the hologram medium from the acquired image, and records hogels on the hologram medium by referring to the generated light efficiency maps of the hologram medium. Accordingly, light efficiency is measured on each hogel area, and hologram printing is performed by adjusting an intensity of a laser of each wavelength according to a hogel, so that uniformity of luminance and color of a hologram printing result can be enhanced.