Backlight Compensation Drive Signal Timing for Display Flicker Reduction
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Solution Overview
Problem
In the freesync mode of display devices, motion blur occurs due to inconsistent display brightness across frames with different field frequencies, leading to flicker and reduced display quality.
Innovation Solution
A brightness compensation method that adjusts the start and end times of backlight drive signals based on preset parameters and frame characteristics, ensuring consistent backlight emission across frames, thereby reducing flicker and improving display clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device operates in freesync mode with variable field frequencies, then the display can adapt to different content requirements and reduce power consumption, but the backlight timing becomes inconsistent across frames causing motion blur and flicker
Solution Approach 1:
The patent applies dynamics by making the backlight drive signal timing adaptive to different field frequencies. The system dynamically adjusts the backlight compensation drive signal parameters (start time, end time, duty cycle) based on the actual field frequency of each frame, transforming a static timing system into a dynamic one that responds to varying display conditions.
Solution Approach 2:
The patent changes the timing parameters of the backlight drive signal to resolve the contradiction. By adjusting the start time, end time, and duty cycle of the backlight compensation drive signal based on the front porch period and field frequency, the system maintains consistent backlight timing across frames with different frequencies, eliminating motion blur while preserving freesync adaptability.
2Stability of the object's composition
If the backlight drive signal timing is adjusted to compensate for variable field frequencies, then motion blur and flicker are reduced, but the complexity of the drive signal generation increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the relationship between the front porch period and the backlight compensation drive signal timing. The system calculates the start and end times of the backlight signal based on the known front porch period structure, preparing the compensation parameters in advance rather than reacting to timing issues after they occur.
Solution Approach 2:
The patent uses the front porch period as an intermediary to synchronize backlight timing with variable field frequencies. By anchoring the backlight compensation drive signal to the front porch period structure, the system creates a reliable reference point that mediates between the variable display timing and the required consistent backlight timing, simplifying the control logic.
Data Source
AI summary
A brightness compensation method includes steps of: determining a start time of a backlight compensation drive signal of a current frame according to an end time of a standard backlight drive signal of the current frame, and starting transmitting the backlight compensation drive signal to a backlight assembly at the start time of the backlight compensation drive signal; and determining an end time of the backlight compensation drive signal according to a time length of the front porch period of the current frame, and stopping transmitting the backlight compensation drive signal to the backlight assembly at the end time of the backlight compensation drive signal, wherein, the backlight assembly emits light as standard backlight according to the standard backlight drive signal when receiving the standard backlight drive signal, and emits light as compensated backlight according to the backlight compensation drive signal when receiving the backlight compensation drive signal.