Video Driver Connectivity Evaluation Using Idle Period Impedance Comparison
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Solution Overview
Problem
Existing methods for evaluating connectivity between a video driver and a display are inefficient and consume high power, particularly in modern systems on chip with multimedia support, where cable detection is necessary for video playback.
Innovation Solution
A method and device that output a video signal during pixel information idle periods, comparing voltage levels on a terminating resistance to multiple thresholds to determine the display's input impedance, thereby assessing connectivity, and optionally adjusting video formats and using low-power circuits to reduce consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable detection is performed to determine display connectivity, then connectivity evaluation capability is improved, but power consumption increases
Solution Approach 1:
The patent implements cable detection during pixel information idle periods only, rather than continuously. The detection is performed periodically when the display is not actively receiving pixel data, which reduces the overall power consumption while maintaining the ability to evaluate connectivity when needed
Solution Approach 2:
The system uses its own existing video signal output and idle periods to perform self-diagnosis of cable connectivity. By utilizing the already-present video signal and the natural idle periods in the display interface, the system can evaluate connectivity without requiring separate dedicated detection circuits or continuous operation, thereby reducing power consumption
2Reliability
If continuous cable detection is performed, then connectivity status is always monitored, but power consumption and processing overhead increase
Solution Approach 1:
The detection operation is restricted to idle periods when no pixel information is being transmitted. This periodic approach allows connectivity monitoring without requiring continuous processing, thereby maintaining reliability while improving processing efficiency during active display periods
Solution Approach 2:
The system performs connectivity detection in advance during idle periods before the next active display period begins. This ensures that connectivity status is known beforehand, allowing the system to prepare appropriate video formats or error handling without interrupting the main display operation
Data Source
AI summary
A device for evaluating connectivity between a video driver and a display, the device comprises a first video driver, a first output connector, a first terminating resistance; wherein the device is characterized by comprising a first comparison unit; wherein the first video driver has an output port that is coupled to the first output connector, to the first terminating resistance and to the first comparison unit; wherein the first output connector is configured to be coupled via a first cable to a first input of the display; wherein the first comparison unit is adapted to perform comparisons between a voltage level on the first terminating resistance to multiple thresholds and to determine whether a display first input impedance is substantially equal to the first terminating resistance, whether the display first input impedance is substantially lower then the first terminating resistance, or whether the first video driver is disconnected from the display; wherein the comparisons are executed during a pixel information idle period.