Power Management Circuit for Touch Display Panel Mode Adaptation

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Solution Overview

Problem

Existing touch/display devices face increased power consumption due to unadjusted power supply during display and touch operations, leading to inefficiencies and higher manufacturing costs, as they require separate devices like multiplexers and switches to manage different operation modes.

Innovation Solution

A power management circuit that includes a control signal reception circuit, output signal change circuit, and control target selection circuit, allowing it to adjust its output signal and operation based on the driving mode of the panel without additional devices, optimizing power consumption by controlling power supply to integrated circuits during different operation modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate devices like multiplexers and switches are added to manage different operation modes, then the ability to adjust power supply according to operation type is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveoperation mode adjustment capabilityVSAvoidcircuit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The power management circuit is designed to perform multiple functions by integrating operation mode detection, power supply adjustment, and signal routing capabilities into a single circuit block, eliminating the need for separate multiplexers and switches while maintaining the ability to adapt to different operation modes

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines previously separate functional blocks (operation mode detection circuit, power supply adjustment circuit, and signal routing circuit) into an integrated power management circuit, reducing overall device complexity while preserving adaptability to different operation modes

Inventive Principle:

Principle #5Merging (Combining)

2Device complexity

If power supply is not adjusted according to operation type, then device simplicity is maintained, but power consumption increases

Engineering Contradiction:

Improvecircuit simplicityVSAvoidpower consumption

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The power management circuit dynamically adjusts power supply levels based on the detected operation mode, transitioning between different power states (first power supply level for touch sensing, second power supply level for display) to optimize energy consumption while maintaining circuit simplicity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The circuit changes power supply parameters (voltage or current levels) according to the operation type by detecting operation mode signals and adjusting corresponding power supply levels, achieving energy efficiency without complex additional devices

Inventive Principle:

Principle #35Parameter changes

3Reliability

If standby power is supplied to display driving circuit during touch sensing operation, then display functionality is maintained, but power loss increases

Engineering Contradiction:

Improvedisplay functionalityVSAvoidstandby power loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The power management circuit segments power supply control by operation mode, selectively supplying power to different circuit blocks (touch sensing circuit or display driving circuit) based on the current operation, thereby eliminating unnecessary standby power consumption while maintaining required functionality

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The circuit periodically switches between different power supply states corresponding to different operation modes (touch sensing mode with reduced display power, display mode with reduced touch power), optimizing energy usage while maintaining functionality during each operational period

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12259772B2Power management circuit and touch/display device including the same

Publication Date: 2025.03.25 LX SEMICON CO LTD

AI summary

A power management circuit includes a control signal reception circuit configured to receive a power control signal for controlling an operation of the power management circuit in correspondence to a driving mode of a panel, from a microcontroller which receives information on the driving mode of the panel; an output signal change circuit configured to change an output signal of the power management circuit in response to the power control signal; a control target selection circuit configured to select a control target circuit to which the output signal is to be transferred; and an output signal transmission circuit configured to transfer the output signal to the control target circuit.