Variable Frequency Scan Driver for Display Flicker Control
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Solution Overview
Problem
Display devices operating in variable frame mode experience luminance differences and flicker due to changes in driving frequency, which can lead to a tearing phenomenon and inconsistent image quality.
Innovation Solution
A display device with a variable driving frequency range, where a scan driver provides a first scan signal at a variable input frame frequency and a second scan signal at a maximum driving frequency, ensuring consistent luminance across different frequencies by controlling the operation of transistors and light emitting diodes within pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device operates in variable frame mode to synchronize with variable frame frequency, then the tearing phenomenon is reduced or prevented, but luminance of the display panel varies and flicker occurs due to driving frequency changes
Solution Approach 1:
The scan driver dynamically adjusts the timing of scan signals based on the driving frequency. When operating at variable frame frequencies, the system modifies the blank period duration to maintain consistent luminance while preventing tearing. This dynamic adjustment resolves the contradiction by adapting the display operation to match the variable frame frequency without compromising image quality consistency.
Solution Approach 2:
The invention changes the timing parameters of scan signals and blank periods according to the driving frequency. By adjusting these temporal parameters dynamically, the system maintains luminance consistency across different driving frequencies while enabling variable frame mode operation to prevent tearing.
2Reliability
If the display device uses variable frame mode to match host processor frame frequency, then frame frequency mismatch is reduced, but luminance difference and flicker increase due to driving frequency variations
Solution Approach 1:
The system incorporates feedback mechanisms to monitor the driving frequency and adjust scan signal timing accordingly. This feedback loop ensures that luminance remains consistent while the display operates at variable frame frequencies, resolving the contradiction between frame synchronization and luminance stability.
3Reliability
If the display panel is driven at high frame frequency to improve image quality, then tearing is prevented, but power consumption increases and luminance consistency deteriorates
Solution Approach 1:
The scan driver dynamically adjusts operation based on actual driving frequency requirements. Rather than operating at a fixed high frequency, the system adapts the scan signal timing to match the actual frame frequency, reducing unnecessary power consumption while maintaining image quality consistency through intelligent frequency matching.
Data Source
AI summary
A display device includes a display panel that includes a plurality of pixels, a data driver configured to provide a data voltage to the plurality of pixels, a scan driver configured to provide a first scan signal and a second scan signal to the plurality of pixels, and a controller configured to control the data driver and the scan driver. The display panel is driven at a driving frequency that is variable within a driving frequency range. The scan driver provides the first scan signal to the plurality of pixels at the driving frequency, and provides the second scan signal to the plurality of pixels at a second driving frequency that is equal to or higher than the driving frequency.