Touch Circuit Boost Circuit With Alternating DAC Drive
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Solution Overview
Problem
In folding mobile phones with flexible AMOLED panels, the increasing parasitic capacitance between touch and display panels leads to noise interference, necessitating higher driving voltages for touch circuits, which in turn increases power consumption.
Innovation Solution
A low power consumption boost circuit utilizing a charge pump, digital-to-analog converters (DACs), and low dropout regulators (LDOs) alternately drives the touch circuit with ground voltage and regulated output voltages, reducing power consumption by switching between different voltage sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high driving voltage is applied to the touch circuit to resist noise interference, then the signal strength for driving the touch circuit is improved, but the power consumption of the touch circuit increases
Solution Approach 1:
The touch circuit is divided into multiple sub-circuits that are driven alternately. Instead of driving the entire touch circuit simultaneously with high voltage, the circuit is segmented into sections that are activated in sequence, reducing the overall power consumption while maintaining sufficient signal strength for each segment
Solution Approach 2:
The touch circuit is driven in periodic alternating cycles rather than continuously. The driving voltage is applied periodically to different segments of the touch circuit, allowing the system to maintain reliable signal transmission while reducing average power consumption through intermittent operation
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 maintaining high driving voltage requirements, achieving a lower total power consumption compared to traditional boost circuits.
Implementation Method 1
The charge pump circuit includes an input terminal, a positive output terminal, and a negative output terminal. The input terminal receives a system voltage. The positive output terminal outputs a positive output voltage twice the system voltage. The negative output terminal outputs a negative output voltage with opposite polarity as the system voltage.
Implementation Method 2
The first LDO receives the positive output voltage from the positive output terminal to regulate the positive output voltage, thereby providing the regulated positive output voltage to the first DAC as supply power. The second LDO receives the negative output voltage from the negative output terminal to regulate the negative output voltage, thereby providing the regulated negative output voltage to the second DAC as supply power.
Data Source
AI summary
A low power consumption boost circuit for providing high driving voltage of a touch circuit is provided. The low power consumption boost circuit includes a charge pump circuit, two digital-to-analog converters (DACs), and a switch circuit. The charge pump circuit receives a system voltage and correspondingly outputs a positive output voltage twice the system voltage and a negative output voltage with opposite polarity as the system voltage. One of the DACs receives the positive output voltage from the charge pump circuit as supply voltage, and the other DAC receives the negative output voltage from the charge pump circuit as supply voltage. The switch circuit is connected between the DACs and the touch circuit. The DACs are connected between the charge pump circuit and the switch circuit. The DACs are alternately connected to the touch circuit by controlling the switch circuit, thereby driving the touch circuit alternately.