Image Display Device Illumination Control Color Saturation
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Solution Overview
Problem
Liquid crystal display devices, such as projection type and rear surface projection devices, face challenges in maintaining color accuracy due to limitations in illumination control and gray-scale range, leading to changes in color saturation and projection image quality when adjusting illumination or gray-scale ranges.
Innovation Solution
An image display device with an optical modulation element that adjusts illumination based on brightness information and performs color conversion processing to maintain color reproduction within a predetermined color space, using units for illumination adjustment, color conversion, and gray-scale range change processing to offset changes in illumination and gray-scale characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the amount of illumination light is adjusted according to APL to extend dynamic range, then the brightness display range is improved, but the color saturation level changes
Solution Approach 1:
The patent applies parameter changes by adjusting the amount of illumination light according to APL values while simultaneously performing gray-scale range change processing and color conversion. This allows the system to extend the brightness dynamic range through illumination control while compensating for color saturation changes through coordinated processing of gray-scale and color parameters, thereby maintaining color accuracy across different brightness levels
Solution Approach 2:
The patent implements feedback by using APL information to control illumination light amount and by performing color conversion based on the adjusted illumination levels. The system continuously monitors brightness information and adjusts both illumination and color processing parameters accordingly, creating a closed-loop control system that maintains color saturation while extending dynamic range
2Illumination intensity
If gray-scale range change processing is performed to extend dynamic range, then the brightness display range is improved, but the color characteristic changes
Solution Approach 1:
The patent applies parameter changes by performing gray-scale range change processing that increases pixel values based on brightness information, while simultaneously executing color conversion processing. This coordinated adjustment of gray-scale and color parameters allows the system to extend the brightness dynamic range while compensating for color characteristic changes, maintaining accurate color reproduction across the extended range
Solution Approach 2:
The patent implements feedback by using brightness information to control both gray-scale range change and color conversion processing. The system monitors the display information and adjusts gray-scale and color parameters in response to brightness levels, creating a closed-loop control that maintains color characteristics while extending dynamic range
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 ensures reliable color maintenance of the display image even when illumination is adjusted or gray-scale range is changed, extending the dynamic range of brightness without altering peak brightness values and correcting for color characteristics of the liquid crystal light valve.
Implementation Method 1
an optical modulation element, which modulates light emitted from a light source according to display information, and displays a display image based on the display information
Implementation Method 2
a liquid crystal display device using a liquid crystal light valve as an optical modulation element
Data Source
AI summary
An image display device having an optical modulation element, which modulates light emitted from a light source according to display information, and displaying a display image based on the display information includes: a unit adjusting the amount of illumination light with respect to light emitted from the light source on the basis of brightness information on the brightness of the display image based on the display information; a color conversion processing unit that performs a color conversion process according to the brightness information with respect to the display information so that the display image can be color-reproduced within a predetermined color space; and a display and driving unit that drives the optical modulation element on the basis of the display information having been subjected to the color conversion process so as to display the display image.