Display System Backlight Timing Control for Double Image Reduction
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Solution Overview
Problem
Conventional display devices experience double image effects due to motion blur and flickering, particularly when using pulse width modulation for backlighting, which reduces visual quality and can cause eye strain or vision damage over time, especially with high-speed dynamic images.
Innovation Solution
The display method involves increasing the transmission rate of the panel data clock signal and extending the vertical synchronization period to include a longer blank interval, allowing the backlight to be enabled only during this interval, thereby separating the backlight activation from pixel refreshing and optimizing the duty cycle to reduce motion blur and double image effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight source is enabled during the vertical pixel active synchronization interval to maintain brightness, then the average backlight brightness is improved, but motion blur effect and double image effect occur due to pixel refreshing during the same time interval
Solution Approach 1:
The patent segments the vertical synchronization period into two distinct intervals: the vertical pixel active synchronization interval for pixel refreshing and the blank interval for backlight enabling. This temporal segmentation separates the pixel updating process from the backlight illumination, preventing the double image effect while maintaining brightness. The blank interval is specifically designed to provide a sufficient time window where pixels are stable and backlight can illuminate without causing motion blur.
2Manufacturing precision
If the vertical synchronization period is extended to include a longer blank interval for backlight enabling, then the double image effect is reduced, but the time available for pixel refreshing may be insufficient
Solution Approach 1:
The patent dynamically adjusts the transmission rate of the panel data clock signal based on the display content and requirements. When high-quality display is needed, the transmission rate is optimized to ensure complete pixel refreshing within the vertical pixel active synchronization interval. The system adaptively balances the clock transmission rate with the vertical synchronization period configuration, allowing flexible allocation of time resources between pixel refreshing and backlight illumination without compromising either function.
3Manufacturing precision
If pulse width modulation signal with optimized duty cycle is used to maintain average backlight brightness and reduce motion blur, then the visual quality is improved, but the display device may not support the optimized duty cycle due to vertical synchronization signal constraints
Solution Approach 1:
The patent changes the parameter configuration of the vertical synchronization signal by extending the vertical synchronization period to include a dedicated blank interval. This parameter change allows the backlight duty cycle to be optimized for reducing motion blur and double image effects without being constrained by the original vertical synchronization signal specifications. The extended period provides the flexibility to implement optimal backlight timing that was previously unavailable due to signal constraints.
Data Source
AI summary
A display method includes changing a first transmission rate of a panel data clock signal to a second transmission rate, changing a first vertical synchronization period of a vertical synchronization signal to a second vertical synchronization period including a vertical pixel active synchronization interval and a blank interval according to at least the second transmission rate of the panel data clock signal, and merely enabling a backlight device during a time interval of any length within the blank interval. The second transmission rate is greater than the first transmission rate. The second vertical synchronization period is greater than the first vertical synchronization period.