Backlight Brightness Adjustment via Image Loading Value
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Solution Overview
Problem
Conventional LCD display systems face issues with adjusting backlight brightness, leading to inadequate image display when ambient brightness is high and gray values are low, causing dark images and difficulty in responding to changes between images with different light degrees.
Innovation Solution
A device and method that adjust backlight brightness by calculating an image-loading value from image data and comparing it to a preset value, using a buffer, counter, and comparator to output control signals for brightness adjustment, ensuring optimal display in varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If backlight brightness is reduced when ambient brightness is high, then energy consumption is reduced, but image display quality deteriorates when gray values are low
Solution Approach 1:
The patent changes the control parameter from simple ambient brightness detection to image content analysis based backlight adjustment. By analyzing image characteristics (average brightness, contrast, gray value distribution) and dynamically adjusting backlight brightness according to these parameters, the system achieves both energy savings and maintained image quality. The backlight controller modifies backlight intensity based on calculated image parameters rather than fixed ambient light conditions.
2Device complexity
If backlight brightness is adjusted based on ambient light only, then device complexity is reduced, but adaptability to different image content deteriorates
Solution Approach 1:
The patent makes the brightness control system multi-functional by enabling it to respond to both ambient light conditions and image content characteristics. The backlight controller not only receives ambient light sensor signals but also processes image data from the display buffer, calculating multiple image parameters (average brightness, contrast ratio, gray value distribution) and integrating both information sources to make comprehensive brightness adjustment decisions, thereby achieving universal adaptability.
Solution Approach 2:
The system implements feedback control by continuously monitoring both ambient light levels and image content characteristics, then dynamically adjusting backlight brightness based on this feedback. The controller calculates image parameters from displayed frame data and uses this information to modulate backlight intensity in real-time, creating a closed-loop system that adapts to changing display conditions.
3Speed
If simple ambient light detection is used, then response speed is fast, but precision of brightness adjustment deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal backlight brightness levels based on image content analysis before actual display. The system analyzes image characteristics in advance (during frame buffering or processing) and determines appropriate backlight settings, so when brightness adjustment is needed, the pre-computed values are immediately applied, maintaining fast response while achieving precise adjustment based on thorough image analysis.
Data Source
AI summary
A device and method for adjusting backlight brightness employed in a display. The device has a buffer, a counter, and a comparator. The buffer receives and stores an image data of a frame. The counter receives the image data and obtains an image-loading value of the image data. The comparator is coupled to the counter and compares the image-loading value with a preset image-loading value. The comparator outputs a control signal indicating the comparison result to a backlight module to adjust the brightness of the backlight module.