Touch Controller Clock Suspension for Power Savings
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Solution Overview
Problem
The existing touch sensing systems face issues with power consumption and data communication efficiency between the touch driving circuit and the touch controller, leading to degraded performance when data communication is not smooth.
Innovation Solution
The touch controller adjusts the level of the communication control signal during data communication periods, allowing data transmission even when the system clock signal is not output, by changing the communication control signal level multiple times, thereby enabling normal data communication and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch controller outputs a system clock signal continuously, then data communication between the touch controller and touch driving circuit is reliable, but power consumption increases
Solution Approach 1:
The touch controller outputs the system clock signal periodically rather than continuously. The clock signal is output during data communication periods and suspended during non-communication periods, achieving both power savings and reliable communication when needed
Solution Approach 2:
A communication control signal is introduced as an intermediary to coordinate data transmission between the touch controller and touch driving circuit. This signal indicates when data communication is active, allowing the system clock to be suspended during non-communication periods while maintaining reliable communication when the control signal is active
2Use of energy by moving object
If the touch controller suspends the system clock signal to reduce power consumption, then power consumption decreases, but data communication efficiency deteriorates
Solution Approach 1:
The touch controller outputs communication control signals and transmits data during periods before the system clock is fully suspended. This preliminary data transmission ensures communication efficiency is maintained during active periods while allowing the clock to be suspended during non-communication periods to save power
Solution Approach 2:
The system dynamically adjusts the system clock output based on communication needs. The clock is active during data communication periods and suspended during non-communication periods, creating a dynamic power management system that adapts to real-time communication requirements
3Loss of time
If the touch controller changes the communication control signal level multiple times during data communication periods, then data transmission timing is improved, but signal complexity increases
Solution Approach 1:
The communication control signal acts as a feedback mechanism between the touch controller and touch driving circuit. By changing the signal level multiple times during data communication periods, the controller provides timing feedback that improves data transmission synchronization without requiring complex additional circuitry
Data Source
AI summary
Embodiments of the present disclosure relate to a touch controller, a touch sensing system, and a touch display device. Among data communication periods between the touch controller and a touch driving circuit, during the data communication period included in a period in which a system clock signal is not output, a level of a communication control signal is changed a plurality of times, thereby allowing the touch driving circuit to recognize an address start time point. Therefore, it is possible to reduce power consumption of the touch sensing system by reducing a period in which the system clock signal is output and to improve the efficiency of data communication of the touch sensing system by enabling normal data communication in a period in which the system clock signal is not output.