AC Coupling Capacitor Charging for eDP Signal Restoration
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Solution Overview
Problem
The challenge is to shorten the restoration time of signal transmission between AC-coupled apparatuses without increasing power consumption, as existing methods struggle to meet the 20 μs requirement for resuming Main Link signal reception after AUX_PHY_WAKE signal transmission due to the time needed to charge and stabilize AC coupling capacitances.
Innovation Solution
A transmission apparatus that controls the transmission of a charging signal to charge AC coupling capacitances before ending a control signal, allowing the signal line potential to be stabilized, thereby reducing the time needed to resume signal transmission and meeting the 20 μs requirement without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a DC bias circuit is used to maintain potential of signal lines during suspension period, then the restoration time is shortened, but the power consumption is increased
Solution Approach 1:
The patent applies preliminary action by transmitting a charging signal through the AUX CH channel before the Main Link signal transmission is suspended. This charging signal pre-charges the AC coupling capacitance, so that when the transmission is restored, the capacitance is already charged and the signal lines have stabilized potential, eliminating the need for a DC bias circuit to maintain potential during suspension and thus reducing power consumption while meeting the 20 μs restoration time requirement
2Use of energy by moving object
If transmission processing of Main Link is suspended to decrease power consumption, then power consumption is reduced, but restoration time becomes too long to meet 20 μs requirement
Solution Approach 1:
The patent uses preliminary action by performing the charging of AC coupling capacitance before the Main Link transmission is suspended. The charging signal is transmitted via the AUX CH channel, which remains active or can be activated independently. This ensures that when the Main Link transmission is restored after suspension, the capacitance is already charged and potential stabilization is complete, allowing the system to meet the 20 μs restoration time requirement while still benefiting from the power savings of suspending the Main Link transmission
3Stability of the object's composition
If AC coupling capacitance is charged and signal line potential is stabilized using conventional methods, then signal transmission stability is improved, but the restoration time exceeds 20 μs requirement
Solution Approach 1:
The patent applies preliminary action by charging the AC coupling capacitance and stabilizing the signal line potential before the Main Link transmission is suspended. The charging signal is transmitted through the AUX CH channel, which allows for independent control of the charging process. This preliminary charging ensures that when the Main Link transmission is restored, the signal lines already have stable potential, enabling the system to meet the 20 μs restoration time requirement while maintaining signal transmission stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively shortens the restoration time of signal transmission between AC-coupled apparatuses, ensuring compliance with the 20 μs requirement while maintaining low power consumption by optimizing the timing of control and charging signal transmissions.
Implementation Method 1
a transmission of a charging signal that charges an AC coupling capacitance serially connected to the first signal line via the first signal line is started
Data Source
AI summary
The present technology relates to a communication system, and a transmission method that a restoration time from a state that a transmission of a signal between AC-coupled apparatuses is suspended can be shortened without increasing a power consumption.A first control signal is transmitted via the second signal line in a case where a transmission of the signal via the first signal line is restored from a suspended state, and that a transmission of a charging signal that charges an AC coupling capacitance serially connected to the first signal line via the first signal line is started before a timing when the transmission of the first control signal is ended. The present technology is applicable, for example, to a communication system in conformity with the eDP standard.