Display Touch Drive Circuit for Wake-On-Touch During Host Sleep
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Solution Overview
Problem
Display touch panels of the In-cell type cannot cooperate with the Windows 11 operating system to achieve the Wake On Touch (WOT) function due to the integration of the Analog Front End (AFE) and drive modules in a single chip, leading to power supply disruption when the host goes to sleep.
Innovation Solution
A circuit design incorporating a power supply conversion module, power supply management module, and control module to switch between touch and display power supplies, ensuring the display touch drive module remains operational during host sleep, enabling scanning and touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the SRIC integrates AFE, drive module, and source drive module in a single chip, then the device complexity is reduced and manufacturing is simplified, but the reliability of WOT function is lost because the entire SRIC must be powered off when display power is turned off
Solution Approach 1:
The patent divides the power supply system into separate touch power supply and display power supply channels, allowing independent control of each. The SRIC is segmented into touch-related circuits that can remain powered and display-related circuits that can be powered down, resolving the contradiction between integration benefits and WOT reliability
Solution Approach 2:
The patent introduces a power supply conversion module and control module as intermediaries between the power supply system and the SRIC. These intermediary components enable selective power distribution to different parts of the SRIC, allowing the touch function to remain operational while the display function is powered down
2Loss of energy
If the display power supply is turned off when host goes to sleep, then energy consumption is reduced, but the touch module cannot achieve WOT function because the SRIC is completely powered off
Solution Approach 1:
The power supply system is segmented into independent touch power supply and display power supply channels. This allows the touch power supply to remain active while the display power supply is turned off during host sleep, enabling WOT function while reducing overall energy consumption
Solution Approach 2:
The patent implements dynamic power supply control where the power supply conversion module can switch between different power sources based on host state. During sleep mode, the system dynamically redirects power to the touch circuitry while cutting power to the display circuitry, adapting the power distribution to current operational needs
3Loss of energy
If the SRIC is completely powered off when display power is turned off, then energy saving is maximized, but the touch scanning and detection function is lost
Solution Approach 1:
The SRIC is functionally segmented into touch processing circuits and display drive circuits. The touch processing circuits remain powered through the touch power supply channel, while display drive circuits are powered down through the display power supply channel, enabling touch detection without sacrificing energy savings
Solution Approach 2:
The patent extracts the touch power supply function from the display power supply system, creating an independent power channel for touch circuits. This extraction allows touch scanning and detection to continue operating independently of the display power state, maintaining productivity while achieving energy efficiency
Data Source
AI summary
The present application discloses a method, circuit, and device for driving a display touch panel, and a display touch device. A power supply conversion module, a power supply management module, a display touch drive module, and a control module are disposed in a circuit for driving a display touch panel, the control module sends an enabling signal to the power supply conversion module, the power supply conversion module switches an input power supply of the power supply management module to a touch power supply or a display power supply according to the enabling signal. Through the above technical solution, after a host sleeps, the display touch drive module still remains on-line, which may drive the display touch panel to scan, so as to identify whether the display touch panel is touched or not and further achieve a Wake On Touch (WOT) function.