Source Driver IC Low Power Mode for Touch Sensing
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Solution Overview
Problem
Display driving devices with time-division operation experience increased power consumption due to static and dynamic current consumption by the source driver IC during touch sensing periods, even when it does not need to operate.
Innovation Solution
Implementing a source driver IC that operates in a low power mode by deactivating the analog data processing unit during touch sensing periods, and optionally deactivating both data processing units, reducing power consumption by omitting clock training data transmission during these periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source driver IC operates in normal mode during touch sensing period, then clock training signal can be received and processed, but power consumption increases due to static and dynamic current
Solution Approach 1:
The source driver IC dynamically switches between normal mode and low power mode based on the operational phase (display period vs. touch sensing period). During touch sensing period, the IC transitions to low power mode where clock training signal reception is suspended, reducing power consumption while maintaining functionality during display periods.
Solution Approach 2:
The source driver IC operates in periodic cycles, alternating between normal mode during display periods and low power mode during touch sensing periods. This periodic switching allows the system to maintain clock training capabilities when needed while minimizing power consumption during intervals when the source driver IC is not required for display operations.
2Ease of operation
If the source driver IC operates in normal mode during touch sensing period, then data processing units remain active, but power consumption increases due to static and dynamic current
Solution Approach 1:
During touch sensing period, the data processing units are extracted or deactivated from the operational state. The source driver IC selectively disables the analog data processing unit and optionally the digital data processing unit, removing their power consumption contribution while maintaining the ability to quickly reactivate them for display periods.
3Use of energy by moving object
If the source driver IC is deactivated during touch sensing period, then power consumption is reduced, but quick resumption of normal operation is needed for display periods
Solution Approach 1:
The source driver IC maintains certain operational states or configurations during low power mode that enable quick resumption. By preserving essential parameters or pre-configuring certain components, the IC can rapidly transition from low power mode back to normal mode at the start of display periods without requiring complete re-initialization.
Data Source
AI summary
A display driving device capable of operating a source driver integrated circuit (IC) in a low power mode during a touch sensing period includes a source driver IC configured to operate in a first low power mode in which an analog data processing unit is deactivated or operate in a second low power mode in which both of the analog data processing unit and a digital data processing unit are deactivated, during a touch sensing period of a first frame; and a readout IC configured to supply touch sensor driving signals to touch sensors during the touch sensing period and receive touch sensing data from the touch sensors according to the touch sensor driving signals.