Backlight Brightness Adjustment for LCD Blue Image Contrast
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in maintaining optimal backlight brightness, particularly for blue images, which appear visually dark due to human eyes' sensitivity differences across wavelengths, leading to suboptimal contrast and increased power consumption.
Innovation Solution
A method and device that dynamically adjust backlight brightness by obtaining grayscale characteristic values of primary colors (red, green, and blue) in an image, determining a backlight value based on these values and corresponding coefficients, and adjusting the backlight brightness accordingly, with a higher coefficient assigned to blue to compensate for its lower perceived brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform backlight brightness is used for all colors, then the display structure is simple and power consumption is low, but blue images appear visually dark due to human eyes' sensitivity differences
Solution Approach 1:
The patent applies local quality by differentiating backlight brightness control for different color channels. Specifically, the blue color channel receives enhanced backlight brightness compared to red and green channels, compensating for human eyes' lower sensitivity to blue light. This creates non-uniform illumination characteristics tailored to each color's perceptual requirements, improving overall visual quality without requiring complete uniformity across all colors.
Solution Approach 2:
The patent implements dynamic backlight brightness adjustment based on the displayed image content. The system analyzes the color composition of the current frame and dynamically modifies backlight intensity for each color channel accordingly. This dynamic control allows the backlight to adapt to different image scenarios, providing higher brightness for blue-dominant images and standard brightness for other content, thereby resolving the contradiction between visual quality and control complexity.
2Illumination intensity
If backlight brightness is increased for blue images to compensate for perceived darkness, then visual perception of blue images improves, but power consumption increases
Solution Approach 1:
The patent applies partial action by selectively enhancing backlight brightness only when blue color components are detected in the displayed image. Instead of continuously operating the backlight at maximum brightness for all content, the system partially increases brightness specifically for blue images, achieving the necessary compensation for blue perception while avoiding unnecessary energy consumption during non-blue content display.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors the color composition of displayed images and adjusts backlight brightness accordingly. The image analysis unit detects blue color dominance, and this information feeds back to the backlight control unit, which then modulates backlight intensity. This closed-loop feedback ensures backlight brightness is increased only when and where needed, optimizing the balance between visual quality and power consumption.
3Illumination intensity
If dynamic backlight adjustment based on image content is implemented, then contrast and visual quality are enhanced, but processing complexity and computational requirements increase
Solution Approach 1:
The patent segments the backlight control system into distinct functional modules: an image analysis unit that processes color information, a control unit that determines appropriate backlight settings, and a backlight unit that executes the adjustment. This segmentation allows each module to perform its specific function efficiently, reducing overall system complexity by dividing the complex task of dynamic backlight adjustment into manageable, specialized components.
Solution Approach 2:
The patent implements a universal image analysis mechanism that can identify different color compositions (blue-dominant, red-dominant, green-dominant, or balanced) using a single set of processing logic. The control unit applies a unified control strategy that works across all image types, adjusting backlight parameters based on detected color characteristics. This multi-functional approach reduces complexity by avoiding the need for separate specialized processing paths for each image type.
Data Source
AI summary
The disclosure discloses a backlight brightness adjusting method and device and a liquid crystal display device. In the backlight brightness adjusting method, grayscale characteristic values of respective primary colors in an image to be displayed are obtained, that is, contributions of the respective primary colors to an overall grayscale are obtained, to thereby obtain the grayscale contributions of the respective primary colors in the image to be displayed respectively; a backlight value is determined by giving different coefficients to the grayscale characteristic values of the respective primary colors; and finally an output of a backlight driver is adjusted according to the backlight value to thereby adjust backlight brightness.