Touch Power Circuit Offset Shifting for Phase-Aligned Pulse Buffering
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Solution Overview
Problem
Existing touch power circuits generate operation characteristic deviations due to offset deviations between operational amplifiers, leading to phase mismatches between pulse waveforms of touch driving and gate-off modulation signals, which affect touch sensing sensitivity and productivity.
Innovation Solution
A touch power circuit with operational amplifiers that buffer input pulses using alternating voltages and apply offset voltages to ensure level-shifting of output pulses, maintaining the same phase and amplitude for touch driving and gate-off modulation signals, thereby minimizing propagation delay deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operational amplifiers are used to buffer and output gate-off modulation signal, then signal buffering capability is improved, but phase deviation occurs due to offset deviation between amplifiers
Solution Approach 1:
The patent introduces an intermediary component (phase adjustment circuit or calibration mechanism) between the operational amplifiers and the output terminals to compensate for phase deviations. This intermediary element corrects the phase mismatch caused by offset deviations without requiring changes to the core amplifier circuitry, thus maintaining signal buffering capability while improving phase accuracy.
Solution Approach 2:
The patent adjusts operational parameters (such as feedback resistance values, capacitance values, or bias voltages) of the operational amplifiers to compensate for offset deviations. By dynamically or statically tuning these parameters, the system maintains consistent phase relationships between touch driving signal and gate-off modulation signal despite variations in amplifier characteristics.
2Manufacturing precision
If phase of gate-off modulation signal is not aligned with touch driving signal, then operation deviation occurs, but productivity is reduced
Solution Approach 1:
The patent implements a feedback mechanism that monitors the phase relationship between the touch driving signal and the gate-off modulation signal. When phase deviation is detected, the feedback system automatically adjusts the modulation signal's phase or timing to maintain alignment, thereby preventing operation deviation and ensuring consistent productivity without requiring manual intervention.
3Speed
If propagation delay characteristics differ between operational amplifiers, then phase mismatch occurs, but signal consistency deteriorates
Solution Approach 1:
The patent applies preliminary phase adjustment or pre-compensation to the gate-off modulation signal before it is combined with the touch driving signal. By anticipating and correcting for propagation delay differences in advance, the system ensures that both signals arrive at the output with consistent phase relationships, eliminating mismatches caused by varying propagation speeds of different operational amplifiers.
Data Source
AI summary
Disclosed are a touch power circuit and a touch display device in which an operational amplifier buffers an input pulse having a first voltage and a higher second voltage alternate, and uses the buffered input pulse to provide an output pulse. The operational amplifier includes a non-inverting input terminal to which the input pulse is supplied, an inverting input terminal connected to the output terminal, and an output unit driven according to a result of amplifying a difference between a voltage of the non-inverting input terminal and a voltage of the inverting input terminal and configured to charge and discharge the output terminal. The circuits and devices may further include an offset voltage applier configured to supply an offset voltage having a first polarity to the non-inverting input terminal and/or the inverting input terminal to level-shift the input pulse.