Backlight Dimming Block Control for Contrast and Power
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Solution Overview
Problem
Existing backlight dimming technologies, particularly global dimming, struggle to effectively improve the contrast ratio of images while reducing power consumption, as they often fail to adequately control brightness in black and low grayscale areas, leading to insufficient contrast enhancement.
Innovation Solution
An electronic device and control method that dynamically adjust the current duty of local dimming blocks based on pixel information, identifying and varying the size and shape of dimming blocks, and calculating current values using average, maximum, minimum, and intermediate duty values, along with gain values, to generate a driving signal for the backlight unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If global backlight dimming is applied to reduce power consumption, then power consumption decreases, but contrast ratio deteriorates
Solution Approach 1:
The patent divides the backlight unit into multiple independently controllable dimming blocks (first dimming blocks and second dimming blocks) instead of using global dimming. Each block can be controlled separately based on local image requirements, allowing simultaneous power reduction and contrast maintenance through selective dimming of specific regions.
Solution Approach 2:
The patent applies different dimming strategies to different regions: first dimming blocks use current duty control while second dimming blocks use current value control. This localized quality adjustment ensures that areas requiring high contrast (like black and low grayscale areas) maintain proper illumination while other areas reduce power consumption.
2Use of energy by moving object
If local dimming with current duty control is applied, then power consumption reduces, but black level performance deteriorates
Solution Approach 1:
The patent segments the backlight control into two distinct systems: current duty control for first dimming blocks and current value control for second dimming blocks. This segmentation allows the current value control system to specifically address black level deficiencies in certain regions while maintaining power efficiency elsewhere.
Solution Approach 2:
The patent changes the control parameter from current duty (PWM-based) to current value (analog-based) for specific dimming blocks. This parameter change enables more precise control over backlight intensity in critical areas, improving black level performance where current duty control alone is insufficient.
Data Source
AI summary
An electronic device is disclosed. The electronic device comprises an input unit, and a processor for acquiring a current duty of each first dimming block for driving a backlight unit, on the basis of pixel information of an image input through the input unit, identifying at least one second dimming block including at least one first dimming block in the input image on the basis of the pixel information of the input image, acquiring a current value of the second dimming value on the basis of a current duty of the first dimming block included in the identified second dimming block, and acquiring a driving signal for driving the backlight unit, on the basis of the current duty of each first dimming block and the current value of the second dimming block.