Projection Display Color Correction via Liquid Crystal Dynamics
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Solution Overview
Problem
Existing image processing technologies face challenges in correcting color shifts caused by outside light, particularly in bright environments, due to the inability to accurately account for varying spectral distributions of light sources, leading to reduced contrast and color reproducibility, and require expensive measurement instruments for effective correction.
Innovation Solution
An image processing device that generates corrected image data by determining a correction light based on the spectral reflectivity of the projection surface and the spectral distribution of outside light, using a combination of stored data and real-time measurements to achieve accurate color correction without the need for expensive instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light absorption layer with specific wavelength absorption is used to suppress outside light, then contrast is improved, but color accuracy deteriorates when used under different light sources
Solution Approach 1:
The patent applies dynamics by making the screen's optical properties adjustable rather than fixed. The liquid crystal layer changes its orientation based on applied voltage, dynamically switching between transparent and absorptive states to adapt to different lighting conditions while maintaining both contrast and color accuracy.
Solution Approach 2:
The patent changes the physical state parameters of the screen material by controlling liquid crystal orientation through voltage. This allows the screen to modify its spectral transmission characteristics in real-time, resolving the contradiction between fixed absorption properties and adaptive color accuracy across different light sources.
2Manufacturing precision
If spectrographic measurement is performed to correct coloration, then color accuracy is improved, but device cost increases
Solution Approach 1:
The patent enables the projection system to self-correct coloration using its own built-in components. The liquid crystal display system uses its voltage-controlled transparency to generate correction signals without requiring external spectrographic measurement instruments, achieving accurate color correction through self-service.
Solution Approach 2:
The patent replaces complex mechanical spectrographic measurement systems with an electrical control system. Instead of using physical spectrometers and complex optical measurements, the system uses voltage-controlled liquid crystal orientation to achieve color correction, substituting mechanical/optical measurement with electrical control.
3Manufacturing precision
If correction light is added to compensate for outside light, then color accuracy is improved, but illumination intensity increases
Solution Approach 1:
The patent applies partial action by adding correction light only to the extent necessary to compensate for outside light contamination. The liquid crystal display controls the addition of correction light signals selectively and proportionally, avoiding excessive illumination while achieving adequate color accuracy through minimal necessary correction.
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 enables low-cost, high-accuracy color correction of projection images, effectively addressing color shifts and maintaining image quality across different light conditions without the requirement for expensive measurement tools.
Implementation Method 1
a liquid crystal layer which changes a refractive index in response to an applied voltage
Implementation Method 2
a light absorption layer which absorbs light with a specific wavelength
Data Source
AI summary
An image processing device generates image data of a projection image displayed on a screen having a color obtained by correcting a color of original data representing an image to be displayed so that the projection image has a desired color. The image processing device includes a storage section adapted to store a spectral reflectivity of the screen, a designation section adapted to designate a type of an outside light in an installation environment of the screen, a correction light determination section adapted to determine a correction light using a spectral distribution of the reflected light obtained based on the spectral reflectivity and a spectral distribution of the outside light, and a color correction section adapted to generate the image data using the original data and data of a spectral distribution of the correction light.