Backlight Scan-State Control to Prevent LCD Image Shake
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Solution Overview
Problem
LCD display devices face challenges in reducing power consumption without compromising user experience, as lowering the refresh rate can cause screen shaking due to mismatch between refresh rate and human eye resolution.
Innovation Solution
A backlight control device and method that detects the scan state of a gate driving circuit using edge-triggered flip flops and controls intermittent backlight closure between frames, ensuring the backlight is on during scan states and off during non-scan states, effectively inserting black frames to maintain image stability and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh rate of the LCD display device is reduced to lower power consumption, then energy consumption is reduced, but the screen may appear shaken affecting user experience
Solution Approach 1:
The backlight control device implements periodic switching of the backlight based on the scan state detection. The backlight is turned on during scan periods and off during non-scan periods, creating a periodic action pattern that reduces overall power consumption while maintaining image stability during active display periods.
Solution Approach 2:
The system uses a detection component to monitor the scan state of the gate driving circuit and provides feedback to the backlight control component. This feedback mechanism enables the backlight to be dynamically controlled based on the actual scanning status, ensuring the backlight is only active when needed for image display, thus preventing screen shaking while reducing power consumption.
2Duration of action of moving object
If the refresh rate is lowered to extend battery life, then power consumption decreases, but screen shaking occurs due to mismatch with human eye resolution
Solution Approach 1:
The backlight operates in periodic cycles synchronized with the gate driving circuit scan state. During scan periods when pixels are being updated, the backlight is on; during non-scan periods, the backlight is off. This periodic operation extends battery life while maintaining acceptable user experience by ensuring the backlight is only off when no image update is occurring.
Solution Approach 2:
The detection component continuously monitors the scan state and provides real-time feedback to control the backlight. This feedback ensures the backlight timing precisely matches the display refresh timing, preventing visible screen shaking and maintaining user experience while maximizing battery life through reduced backlight duty cycle.
3Loss of energy
If intermittent backlight closure is implemented to reduce power consumption, then energy usage decreases, but control precision of backlight timing must be maintained
Solution Approach 1:
The system employs a feedback mechanism where the detection component monitors the scan state of the gate driving circuit and provides real-time information to the backlight control component. This feedback loop ensures precise timing control of the backlight, turning it on exactly when scanning starts and off when scanning completes, thereby maintaining measurement precision while achieving energy reduction through intermittent operation.
Solution Approach 2:
The backlight control system uses the inherent scan state signals from the gate driving circuit to automatically control the backlight timing without requiring external control signals. The detection component captures the scan state information, and the system self-regulates the backlight timing based on this information, ensuring precise control while simplifying the overall control architecture.
Data Source
AI summary
A backlight control device, a backlight control method, and a display device that avoids image shake are described. The backlight control device comprises: a driving detection component that detects a scan state of a gate driving circuit of a display module and outputs a detection signal, and a backlight control component that controls intermittent closing of a backlight between frames based to the detection signal.