Liquid Crystal Display Image Processing Backlight Adjustment
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Solution Overview
Problem
Conventional methods for enhancing image contrast in liquid crystal displays require pre-modification of the input image, leading to uneven brightness in some areas, as the backlight brightness adjustment is not directly related to the image processing, resulting in inconsistent image appearance.
Innovation Solution
A method that involves acquiring a backlight index from the image, adjusting the backlight accordingly, and transforming gray levels using a reference gray level between boundaries to enhance contrast, allowing for relative brightness control and efficient power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the input image is pre-modified to enhance contrast, then image contrast is improved, but brightness uniformity deteriorates causing some areas to appear particularly bright or dark
Solution Approach 1:
The patent applies preliminary action by analyzing the histogram of the input image and determining the optimal backlight brightness level before the actual display. This pre-analysis allows the system to predict the required backlight adjustment and apply it in advance, ensuring that subsequent gray level transformations maintain brightness uniformity across different image regions.
Solution Approach 2:
The patent changes parameters by dynamically adjusting the backlight brightness level based on the analyzed histogram characteristics. Instead of using fixed gray level boundaries, the system modifies the backlight parameter according to the image content, and相应地 adjusts the gray level transformation parameters to maintain consistency between backlight brightness and displayed image brightness.
2Use of energy by moving object
If backlight brightness is adjusted independently from image processing, then power consumption can be reduced, but brightness uniformity deteriorates across different image areas
Solution Approach 1:
The patent implements feedback by using the histogram analysis results to determine both the backlight brightness adjustment and the gray level transformation parameters. The system continuously monitors image characteristics through histogram analysis and adjusts the backlight and gray level mappings accordingly, creating a closed-loop control system that maintains brightness uniformity while optimizing power consumption.
Solution Approach 2:
The patent merges the backlight control function with the image processing function. Instead of treating them as independent operations, the system integrates them so that the same histogram analysis that drives image contrast enhancement also determines the optimal backlight brightness level, ensuring coordinated adjustment and maintaining brightness uniformity.
Data Source
AI summary
A method for processing images in a liquid crystal display is provided. The method includes the steps of: acquiring a backlight index according to an image; adjusting a backlight according to the backlight index; acquiring a reference gray level according to the adjusted backlight, wherein the reference gray level lies in between a first gray level boundary and a second gray level boundary; transferring a gray level of the image into a corresponding output gray level according to the backlight index when the gray level of the image lying in between the reference gray level and the first gray level boundary; and transferring the gray level of the image into another corresponding output gray level according to a linear relationship when the gray level of the image lying in between the reference gray level and the second gray level boundary.