Backlight Control for Image Display Contrast Stability
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Solution Overview
Problem
Existing image display technologies face challenges in maintaining contrast when changing the color temperature of images, as this process often leads to a drop in brightness and dynamic range, resulting in reduced contrast due to uniform backlight brightness adjustments.
Innovation Solution
An image display apparatus and method that acquires brightness and processing information to dynamically control the emission brightness of the backlight, adjusting it based on the image data to prevent contrast changes caused by color temperature changes, using a control unit that manages backlight brightness for each light-emitting region independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the color temperature of a display image is changed by adjusting image data, then the color temperature is changed, but the brightness and dynamic range of the image data drop, resulting in reduced contrast
Solution Approach 1:
The patent changes the emission brightness parameter of the backlight based on the processed image data's brightness characteristics. By dynamically adjusting the backlight's emission brightness parameter in response to color temperature changes, the system compensates for the brightness drop caused by image processing while maintaining the desired color temperature transformation.
2Illumination intensity
If the emission brightness of the backlight is adjusted using a correction value for color temperature change, then the brightness drop is suppressed, but the contrast drop caused by dynamic range reduction cannot be suppressed
Solution Approach 1:
The patent introduces a feedback mechanism where the control unit continuously monitors the brightness information of the processed image data and dynamically adjusts the backlight's emission brightness accordingly. This closed-loop control ensures that the backlight brightness adapts to the specific brightness characteristics of the processed image, thereby maintaining contrast by compensating for dynamic range reduction effects.
3Temperature
If image processing is performed on input image data, then the color temperature is changed, but the dynamic range drops, resulting in reduced contrast
Solution Approach 1:
The patent dynamically changes the backlight's emission brightness parameter based on the brightness information extracted from the processed image data. This parameter adjustment compensates for the contrast reduction caused by dynamic range loss during color temperature transformation, ensuring that the overall image quality is maintained despite the processing effects.
Data Source
AI summary
An image display apparatus according to the present invention includes a light-emitting unit, a display unit configured to display an image on a screen by modulating light from the light-emitting unit based on image data, a first acquiring unit configured to acquire brightness information on brightness of the image data, an image-processing unit configured to perform image processing on input image data, a second acquiring unit configured to acquire processing information on the image processing, and a control unit configured to control emission brightness of the light-emitting unit based on the brightness information and the processing information, so as to suppress a change in contrast of an image, which is displayed on the screen, caused by the image processing.