Touch Display Analog Front End with Serial Charge Remover Control
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Solution Overview
Problem
Existing touch display devices face challenges in operating multiple charge removers efficiently due to complex wiring structures, which complicates the control and synchronization of charge removal signals.
Innovation Solution
The implementation of a multiplexer circuit, operational amplifier, and a control signal latching circuit with a switched-capacitor or switched-current source array, allowing for individual control of charge removers through a simplified wiring structure by converting serial control signals into parallel control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple charge removers are operated individually through separate control lines, then each charge remover can be controlled independently, but the wiring structure becomes complex
Solution Approach 1:
The control signal is divided into multiple segments corresponding to different charge removers. A serial-to-parallel conversion circuit segments the single control line signal into multiple parallel control signals, each driving a specific charge remover, thus maintaining individual control capability while using a single control line.
Solution Approach 2:
The control architecture transitions from spatial parallelism (multiple control lines) to temporal sequence (serial signaling with timing control). By introducing time dimension through sequential signal distribution and latching, the system achieves individual control of multiple charge removers through a single control line.
2Device complexity
If a simplified wiring structure with single control line is used, then wiring complexity is reduced, but control precision and synchronization of multiple charge removers deteriorates
Solution Approach 1:
A serial-to-parallel conversion circuit acts as an intermediary between the single control line and multiple charge removers. This intermediary circuit receives the serial control signal, converts it to parallel signals, and distributes them to respective charge removers with proper timing, ensuring precise control and synchronization.
Solution Approach 2:
The system employs latching circuits that provide feedback timing control. The latching mechanism ensures that each charge remover receives its control signal at the correct moment in the sequence, maintaining precise synchronization without requiring multiple simultaneous control lines.
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
This solution enables efficient operation of multiple charge removers with reduced wiring complexity, improving communication speed and robustness against noise, while maintaining high-speed control and effective charge removal.
Implementation Method 1
a charge remover including a switched-capacitor array electrically connected with the first input terminal of the operational amplifier and discharging electric charge of the first input terminal of the operational amplifier
Implementation Method 2
a charge remover including a switched-current source array electrically connected with the first input terminal of the operational amplifier and discharging electric charge of the first input terminal of the operational amplifier
Data Source
AI summary
An analog front end for a touch display device operates each of two or more charge removers through a simplified wiring structure by providing an analog front end including a charge remover including a switched-capacitor array that discharges electric charge of a first input terminal of an operational amplifier and a control signal latching circuit that latches a received serial signal according to a generated pulse to generate and output an individual control signal of the switched-capacitor array.