Touch Driving Circuit Current Scaling for Signal Integrity
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Solution Overview
Problem
Existing touch driving circuits in touch display devices face challenges in optimizing the configuration of circuit elements operating in different voltage ranges, leading to stress, noise, and reduced lifespan, while also increasing power consumption.
Innovation Solution
A touch driving circuit that includes a current regulator to scale down input currents from touch electrodes and a converting integrator to output sensing voltages, optimizing circuit elements and reducing power consumption by integrating voltages based on adjusted currents during different levels of touch driving signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuit elements operate in high voltage range and low voltage range without optimization, then the touch driving circuit can perform basic touch sensing function, but the circuit elements experience stress, noise increases, and device lifespan reduces
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the operating voltage of circuit elements based on their specific requirements. High voltage-range elements receive elevated voltage during periods when they are actively driving touch electrodes, while low voltage-range elements operate at lower voltages during integration phases. This optimized voltage parameter assignment reduces stress on each element type, minimizing noise and extending device lifespan without requiring complete circuit redesign.
Solution Approach 2:
The patent implements dynamics by transitioning circuit elements between different operating states (high voltage driving state and low voltage integration state) based on the touch sensing phase. The circuit dynamically switches between using high voltage for charge transfer and low voltage for signal integration, allowing each element to operate in its optimal voltage range at different times, thereby reducing cumulative stress and improving reliability.
2Reliability
If circuit elements operate in high voltage range and low voltage range without optimization, then the touch driving circuit can perform basic touch sensing function, but noise within the device increases
Solution Approach 1:
The patent reduces noise by changing the voltage parameter of circuit elements according to their operational phase. Low voltage-range elements operate at reduced voltage during integration to minimize thermal noise, while high voltage-range elements are activated only during charge transfer phases. This parameter optimization ensures that each element operates at the minimum necessary voltage level, reducing electromagnetic interference and noise coupling between adjacent circuit elements.
3Reliability
If circuit elements operate in high voltage range and low voltage range without optimization, then the touch driving circuit can perform basic touch sensing function, but power consumption increases
Solution Approach 1:
The patent optimizes power consumption by dynamically adjusting the voltage parameter of circuit elements based on operational requirements. During integration phases, low voltage-range elements operate at lower voltages to reduce dynamic power consumption (P=CV²f). During charge transfer phases, high voltage is applied only to the specific elements that require it, rather than maintaining high voltage across the entire circuit. This selective parameter optimization significantly reduces overall power consumption while maintaining touch sensing functionality.
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 proposed solution improves the performance and efficiency of touch sensing, extends the lifespan of the device, and reduces power consumption by optimizing circuit elements and adjusting currents within the touch driving circuit.
Implementation Method 1
a converting integrator configured to output a sensing voltage by integrating a voltage according to the corrected current in each of the first level period and the second level period of the touch driving signal
Data Source
AI summary
A touch display device can include a plurality of touch electrodes disposed on or in a display panel; and a touch driving circuit configured to drive the plurality of touch electrodes by outputting a touch driving signal having a first level period and a second level period. Also, the touch driving circuit includes a current regulator configured to receive an input current from at least one of the plurality of touch electrodes during at least a partial period of the first level period and at least a partial period of the second level period of the touch driving signal, and scale down the input current to a first current and output the first current; and a converting integrator configured to output a sensing voltage based on the first current or a second current adjusted from the first current.