Display Horizontal Sync Signal Synchronization via Vertical Blanking Interval Adjustment
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Solution Overview
Problem
Synchronizing display horizontal synchronization signals between a processing unit and a timing controller in embedded DisplayPort systems is complex, requiring extra hardware resources and causing frame loss and user discomfort due to perceived pauses in screen display.
Innovation Solution
A method that involves receiving an external horizontal synchronization signal, calculating the difference between it and the display horizontal synchronization signal, and adjusting the vertical blanking interval to synchronize the display signal, potentially within one to two frames, without requiring additional hardware resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the timing controller TCON utilizes a continuous capture method to adjust internal signal timing by changing the frame rate, then the driving signals generated by the processing unit and timing controller can be synchronized, but the frame buffer requires complicated read/write actions and extra hardware resources such as a line buffer are needed
Solution Approach 1:
The patent changes the parameter being adjusted from frame rate to vertical blanking interval duration. By modifying the vertical blanking interval parameter instead of the frame rate, the system achieves synchronization without requiring complicated frame buffer read/write operations or additional line buffer hardware resources.
2Reliability
If the timing controller TCON utilizes a continuous capture method to adjust internal signal timing, then the driving signals generated by the processing unit and timing controller can be synchronized, but substantial frame duration is required which causes the user to perceive pauses in screen display
Solution Approach 1:
The patent performs preliminary adjustment of the vertical blanking interval parameter to achieve synchronization within one or two frames. By pre-calculating and applying the appropriate vertical blanking interval adjustment, the system avoids the need for prolonged synchronization periods that would cause visible display pauses.
3Reliability
If the frame rate is reduced to achieve synchronization, then the driving signals can be synchronized, but the frame rate may drop below 40 Hz causing display flicker
Solution Approach 1:
The patent changes the synchronization approach from modifying frame rate to modifying the vertical blanking interval duration. This parameter substitution allows synchronization to be achieved while maintaining the frame rate above 40 Hz, thereby preventing display flicker and ensuring display stability.
Data Source
AI summary
Adjust a vertical blanking interval of a display horizontal synchronization signal, according to a difference between an external horizontal synchronization signal and the display horizontal synchronization signal, for synchronizing the display horizontal synchronization signal to the external horizontal synchronization signal. This only requires one or two frames to synchronize the display horizontal synchronization signal to the external horizontal synchronization signal, and will not cause the user to perceive display pauses or flickers.