Display Control Device White Balance Stabilization
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Solution Overview
Problem
Existing control devices for liquid crystal display devices that adjust luminance based on video signals often alter the light spectrum, leading to significant changes in white balance and reduced video image quality.
Innovation Solution
A control device that analyzes video signals to generate light source luminance control signals, adjusts the luminance of the light source, and corrects video signals to maintain consistent white balance, using pre-calculated relationships between luminance control signals and video correction amounts to ensure high-quality image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance is changed on the basis of the video signal by the dimming unit, then the luminance is adjusted to match the video signal, but the spectrum of the light emitted by the light source is changed, causing white balance changes and reducing video image quality
Solution Approach 1:
The patent applies parameter changes by adjusting multiple parameters of the light source simultaneously - both luminance (intensity) and spectral characteristics (color temperature). The control device modifies the light source parameters based on video signal analysis to achieve both appropriate luminance and consistent white balance, preventing the spectrum change that would otherwise occur with simple luminance adjustment
Solution Approach 2:
The patent implements feedback by analyzing the video signal to determine appropriate light source parameters. The control device continuously monitors the video signal characteristics and adjusts the light source luminance and spectrum accordingly, creating a closed-loop system that maintains white balance while achieving desired luminance levels
2Adaptability or versatility
If the luminance is adjusted to match the video signal, then the display adapts to the video content brightness, but the light spectrum changes causing quality degradation of the video image
Solution Approach 1:
The patent uses parameter changes to simultaneously adjust both luminance and spectral parameters of the light source. By changing multiple parameters together rather than just luminance, the system achieves adaptability to video content while maintaining reliable image quality through consistent white balance
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing relationships between light source control signals and video correction amounts. This allows the system to prepare correction data in advance and quickly adjust both luminance and spectrum parameters when video signals are received, ensuring rapid adaptation without quality degradation
Data Source
AI summary
A control device that controls a video signal to be input to a display device and controls the luminance of a light source that causes light to be incident on the display device includes: a light source luminance control section that controls the luminance of the light source by means of a light source luminance control signal; a storage section that stores relationships between light source luminance control signals and video correction amounts; a video correction signal generating section that generates, on the basis of the video correction amount that is stored in the storage section and corresponds to the generated light source luminance control signal, a video correction signal that is used to correct the video signal; and a video signal correcting section that corrects the video signal by means of the video correction signal.