Display Timing Synchronization for Flicker Prevention
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Solution Overview
Problem
Display systems employing an impulse driving method experience flicker due to inconsistency between the driving timing of the image frame and the panel driving frame, especially when the frame rate of the image frame is changed, leading to phenomena like image tearing and stuttering.
Innovation Solution
A display system and method that synchronize the driving timing of the panel driving frame with the image frame by setting a first clock cycle starting point as the scan starting point of the panel driving frame when consistent with the image frame data input, and delaying the input starting point to a second clock cycle starting point when inconsistent, ensuring the frame rate of the panel driving frame is changed without distorting the emission on-off clock, thus maintaining the emission duty ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frame rate of the panel driving frame is changed to synchronize with the image frame rate, then image tearing and stuttering are prevented, but the emission on-off clock becomes distorted causing perceptible flicker
Solution Approach 1:
The patent applies preliminary action by adjusting the frame rate of the panel driving frame before displaying the image frame, ensuring that the driving timing is synchronized in advance. This prevents image tearing and stuttering by aligning the panel driving frame rate with the image frame rate before the display operation begins, rather than attempting to correct timing issues during active display
Solution Approach 2:
The patent changes the frame rate parameter of the panel driving frame to match the image frame rate, while simultaneously adjusting the emission duty ratio to maintain proper timing. This parameter adjustment allows synchronization without distorting the emission on-off clock, thereby preventing both image artifacts and flicker
2Reliability
If the driving timing of the panel driving frame is synchronized with the image frame, then image tearing and stuttering are prevented, but the emission duty ratio becomes inconsistent
Solution Approach 1:
The patent simultaneously adjusts two parameters: the frame rate of the panel driving frame and the emission duty ratio. By coordinating these parameter changes, the system achieves synchronization between panel driving frame and image frame while maintaining consistent emission timing, preventing both image artifacts and emission clock distortion
Solution Approach 2:
The patent implements feedback by continuously monitoring the relationship between the panel driving frame rate and image frame rate, and adjusting the emission duty ratio accordingly. This feedback mechanism ensures that synchronization is maintained without distorting the emission on-off clock, preserving emission duty ratio consistency
Data Source
AI summary
A display system includes a source device that outputs image-data and a sink device that performs a displaying operation based on the image-data. The sink device changes a frame-rate of a panel driving frame as the source device changes a frame-rate of an image frame. The sink device sets a first clock cycle starting point at which a first clock cycle of an emission on-off clock starts as a scan starting point of the panel driving frame when the first clock cycle starting point is consistent with an input starting point of image frame data. The sink device moves the input starting point to a second clock cycle starting point, at which a second clock cycle following the first clock cycle starts, and sets the second clock cycle starting point as the scan starting point when the first clock cycle starting point is inconsistent with the input starting point.