Panel Driving Device Reducing Parasitic Capacitance
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Solution Overview
Problem
The existing panel driving devices face challenges in increasing touch sensitivity while minimizing parasitic capacitance and power consumption, as increased parasitic capacitance decreases touch sensitivity and higher driving currents increase power consumption.
Innovation Solution
The solution involves a panel driving device with multiple circuits that supply specific signals to sensor electrodes, including a first circuit for a driving signal, a second circuit for a synchronized signal, and a third circuit for a fluctuating signal, which helps in reducing parasitic capacitance and enhancing touch sensitivity, while minimizing power consumption by optimizing the supply voltages and signal waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driving current or driving power is increased to increase touch sensitivity, then touch sensitivity is improved, but power consumption increases and device size increases
Solution Approach 1:
The patent changes the voltage level parameter by operating amplifiers at low voltage levels (first-level and second-level voltages) while maintaining signal integrity through synchronized signal driving. This allows touch sensitivity to be achieved without increasing power consumption, as power consumption is reduced by operating at lower voltage levels rather than increasing current or power.
2Measurement precision
If driving current or driving power is increased to increase touch sensitivity, then touch sensitivity is improved, but device size increases
Solution Approach 1:
The patent operates amplifiers at low voltage levels and uses synchronized signal driving to achieve touch sensitivity without requiring larger or more powerful components. This parameter change approach allows the device to maintain compact size while achieving the desired measurement precision for touch detection.
3Measurement precision
If parasitic capacitance between sensor electrodes is increased, then then capacitance between sensor electrodes and object is relatively decreased, but touch sensitivity is decreased
Solution Approach 1:
The patent converts the harmful effect of parasitic capacitance into a beneficial effect by applying synchronized signals to adjacent sensor electrodes. The parasitic capacitance between adjacent electrodes, which normally causes interference, is utilized to cancel out the parasitic capacitance effect through differential signaling, thereby improving touch sensitivity rather than worsening it.
Solution Approach 2:
The sensing circuit measures capacitance changes between sensor electrodes and objects, and this information is used to adjust and optimize the driving signals. The feedback mechanism allows the system to compensate for parasitic capacitance effects and maintain high touch sensitivity by dynamically adjusting the synchronized signals applied to adjacent electrodes.
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 approach effectively reduces parasitic capacitance, thereby increasing touch sensitivity and reducing power consumption for touch driving, allowing for more accurate object detection and efficient operation.
Implementation Method 1
The panel driving device measures capacitance that is generated between the sensor electrodes and an object by driving the sensor electrodes, thereby sensing the approach or touch of the object.
Implementation Method 2
a second amplifier configured to be driven by the first-level and second-level voltages
Data Source
AI summary
The present invention provides a panel driving device: supplying a first signal to a first sensor electrode by using a first amplifier, so as to detect a change in the capacitance of the first sensor electrode; supplying a second signal, having the same waveform as that of the first signal, to a second sensor electrode adjacent to the first sensor electrode by using a second amplifier; and detecting the proximity or a touch of an external object toward the sensor electrodes according to the change in the capacitance of the first sensor electrode.