Backlight Duty Cycle Control via Histogram Analysis
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Solution Overview
Problem
Traditional backlight local dimming methods for LCD devices reduce power consumption but can compromise image quality due to inappropriate backlight decisions and image compensation.
Innovation Solution
A device that divides input images into blocks, generates histograms to determine high and median gray levels, calculates weight values, and adjusts duty cycles of driving signals for each block based on these values to optimize backlight brightness and reduce power consumption while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional backlight local dimming is used to reduce power consumption, then power consumption is reduced, but image quality deteriorates due to inappropriate backlight decisions and image compensation
Solution Approach 1:
The image is divided into multiple blocks, and each block is processed independently to determine its duty cycle based on local gray level characteristics. This segmentation allows for more precise local control of backlight brightness, improving image quality while maintaining power savings.
Solution Approach 2:
The patent changes the parameter determination method by using histogram analysis to obtain high gray level and median gray level, then calculating weight values based on these parameters. This leads to more accurate duty cycle determination that preserves image quality while reducing power consumption.
2Device complexity
If fixed duty cycle is used in traditional backlight local dimming, then device complexity is reduced, but image quality deteriorates due to inability to adapt to different image content
Solution Approach 1:
The patent implements dynamic duty cycle adjustment by analyzing the gray level distribution of each block through histogram generation. The duty cycle is dynamically determined based on the high gray level and median gray level of each block, allowing the system to adapt to different image content while maintaining reasonable control complexity.
Solution Approach 2:
The system performs self-adjustment by automatically analyzing the image content of each block and determining appropriate duty cycles without external intervention. The histogram-based analysis and weight value calculation enable the system to self-optimize backlight control for different image scenarios.
Data Source
AI summary
A device for driving a backlight assembly of a display device includes: a block division unit for dividing the input image into plural blocks and a duty cycle determination unit. The duty cycle determination unit is used for: generating a histogram of gray levels of pixels of each block; obtaining a high gray level and a median gray level of each block according to the histogram; obtaining a high gray quantity based on the high gray level and a median gray quantity of the median gray level of each block according to the histogram; obtaining a weight value of each block according to the high gray level, the high gray quantity, the median gray quantity, and a lookup table; and calculating a duty cycle of a driving signal of each block according to the weight value, the high gray level, and the median gray level.