Time-Division Touch Sensing Power Control
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Solution Overview
Problem
Time-division driving type touch sensing devices experience increased power consumption due to continuous power supply to unused circuit blocks during pixel and touch sensor driving periods, leading to unnecessary current flow in source driver ICs and readout ICs.
Innovation Solution
Implementing a power controller to cut off supply voltage to data driving and touch readout circuits during respective non-operational periods, using distinct power domains and timing controllers to generate shutdown and wake-up signals, ensuring power is only applied when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving power is continuously supplied to source driver IC and readout IC, then the circuits can operate without interruption, but power consumption increases due to unnecessary current flow in unused circuits
Solution Approach 1:
The patent applies dynamics by making the power supply state changeable - the source driver IC and readout IC can dynamically switch between powered and unpowered states based on operational requirements. During pixel driving period, source driver IC is powered while readout IC is unpowered; during touch sensor driving period, readout IC is powered while source driver IC is unpowered. This dynamic power management resolves the contradiction between continuous operation reliability and power consumption reduction.
Solution Approach 2:
The patent implements periodic action by supplying power to the source driver IC and readout IC in alternating periods. The source driver IC receives power during the pixel driving period and is cut off during the touch sensor driving period, while the readout IC receives power during the touch sensor driving period and is cut off during the pixel driving period. This periodic power supply pattern eliminates unnecessary current flow while ensuring each circuit is powered when needed, thus reducing overall power consumption while maintaining continuous system operation.
2Use of energy by moving object
If power is cut off to data driving circuit during touch driving period, then power consumption is reduced, but the circuit must be quickly reactivated for pixel driving period
Solution Approach 1:
The patent applies preliminary action by preparing the power control signals in advance. The timing controller generates shutdown signals before the touch driving period begins and wake-up signals before the pixel driving period begins. This ensures that power is cut off just before needed and restored just in time, minimizing any potential delay while maximizing power savings. The preliminary generation of control signals ensures smooth transitions between powered and unpowered states.
3Use of energy by moving object
If power is cut off to touch readout circuit during pixel driving period, then power consumption is reduced, but the circuit must be quickly reactivated for touch driving period
Solution Approach 1:
The timing controller generates wake-up signals in advance before the touch driving period begins, ensuring that power is restored to the touch readout circuit just in time for operation. Similarly, shutdown signals are generated before the pixel driving period begins to cut off power proactively. This preliminary action approach ensures minimal transition time while maximizing power savings during non-operational periods.
Data Source
AI summary
A touch sensing display device supporting a pixel driving period and a touch driving period in each frame period. The device comprises a display panel having data lines and touch sensing lines, the data lines coupled to pixels of the display panel. A data driving circuit drives data signals onto the data lines during the pixel driving period of the frame period. A touch readout circuit generates touch data of signals of the touch sensing lines during the touch driving period of the frame period, the touch driving period distinct of the pixel driving period. A supply voltage of the data driving circuit can be cut off during the touch driving period, and a supply voltage of the touch readout circuit can be cut off during the pixel driving period.