Multi-Mode Transmission Driver for Stylus Voltage and Power Control

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Solution Overview

Problem

Existing transmission drivers face challenges in reducing power consumption and accommodating voltage differences required for electromagnetic-coupling styluses, particularly when multiple transmission drivers are used in separate positions.

Innovation Solution

A transmission driver that operates in multiple voltage modes, utilizing a booster circuit and short-circuit control element to adjust voltage ranges from a first voltage to higher voltages, with a capacitive element to manage power supply and signal generation, allowing independent power reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single transmission driver is used to output signals to multiple output signal lines, then device complexity is reduced, but power consumption cannot be independently reduced for each driver

Engineering Contradiction:

Improvetransmission driver configurationVSAvoidpower consumption

Core Design Contradiction:

Device complexityVSUse of energy by moving object

Solution Approach 1:

The patent divides the transmission system into multiple independent transmission drivers (first transmission driver and second transmission driver), each capable of independent power management. Each driver has its own output signal lines and can operate independently, allowing selective power reduction of individual drivers based on usage requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic power management by enabling each transmission driver to switch between active and power-reduced states independently. The power consumption of each driver can be adjusted dynamically based on whether its output signal lines are actively transmitting signals, creating a flexible energy management system.

Inventive Principle:

Principle #15Dynamics

2Reliability

If voltage difference between high level and low level is increased for electromagnetic-coupling stylus, then signal transmission capability is improved, but power consumption increases

Engineering Contradiction:

Improvesignal transmission capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic voltage adjustment where the voltage difference (VDD) can be changed based on operational requirements. When high signal transmission capability is needed, a larger voltage difference is applied; when lower performance is acceptable, a smaller voltage difference reduces power consumption. This creates a trade-off mechanism between reliability and energy usage.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the voltage parameter (VDD) as a controllable variable that can be adjusted to optimize the balance between signal transmission capability and power consumption. By varying the voltage difference between high and low levels, the system can adapt to different operational demands.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If multiple transmission drivers are arranged at separate positions, then signal transmission to different output signal lines is improved, but power consumption cannot be independently reduced

Engineering Contradiction:

Improvesignal transmissionVSAvoidpower consumption management

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent segments the transmission system into multiple independently controllable drivers positioned at separate locations. Each driver (first transmission driver, second transmission driver, etc.) has its own power management capabilities, allowing the system to reduce power consumption of specific drivers independently based on their usage status, while maintaining separate physical positions for optimal signal transmission.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively reduces power consumption while supporting a wide range of voltage requirements, enabling efficient operation with electromagnetic-coupling styluses.

Implementation Method 1

the booster circuit includes a capacitive element

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12535901B2Transmission driver including circuitry that transmits signals with different voltage ranges while operating in different modes, electronic device, and control method of electronic device

Publication Date: 2026.01.27 WACOM CO LTD

AI summary

A transmission driver receives an input signal, a first voltage, and a second voltage higher than the first voltage, and transmits a transmission signal according to the input signal, the transmission driver includes an output terminal that outputs the transmission signal and circuitry that is coupled to the output terminal and that operates in a first mode of transmitting the transmission signal with a first voltage range that ranges from the first voltage to the second voltage, and a second mode of transmitting the transmission signal with a second voltage range that ranges from the first voltage to a third voltage higher than the second voltage.