Touch Display Integrator Circuit for Low-Power Sensing Signal Accumulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As touch display devices increase in resolution and size, the number of touch electrodes, amplifiers, and integrators also increases, leading to larger touch circuits and higher power consumption, which raises costs and energy usage.
Innovation Solution
An integrator with a non-inverting input terminal, feedback capacitor, and path switching units that connect the feedback capacitor between the inverting input and output terminals during rising and falling periods of a pulse waveform reference signal, allowing for simultaneous amplification and integration of voltage differences, reducing the need for separate amplifiers and integrators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch electrodes is increased to improve resolution and size, then the sensing capability is improved, but the number of amplifiers and integrators increases leading to larger touch circuit size and higher power consumption
Solution Approach 1:
The patent combines the amplifier and integrator into a single integrated circuit block. The amplifier amplifies the sensing signal from the touch electrode, and the integrator integrates the amplified signal over time, both functions performed within the same circuit without requiring separate discrete components. This merging reduces the overall circuit size while maintaining the ability to handle multiple touch electrodes for high resolution.
2Reliability
If separate amplifiers and integrators are used for each touch electrode, then the sensing signal processing is improved, but the power consumption and device cost increase
Solution Approach 1:
The integrated circuit performs multiple functions including amplification, integration, and signal processing within a single universal block. This multi-functional design allows the same circuit architecture to be reused across multiple touch electrodes, reducing the total number of components needed and thereby lowering power consumption while maintaining high signal processing quality through dedicated amplification and integration stages.
3Measurement precision
If more amplifiers and integrators are included to handle increased number of touch electrodes, then the touch detection accuracy is improved, but the manufacturing cost increases
Solution Approach 1:
By merging the amplifier and integrator into a single integrated block, the patent reduces the total component count and simplifies the manufacturing process. The integrated design allows for standardized production of the same circuit block to be reused across multiple touch electrodes, achieving high touch detection accuracy through proper signal processing while reducing manufacturing complexity and cost compared to using separate discrete amplifiers and integrators for each electrode.
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 configuration enables the touch display device to reduce the size of the touch circuit and power consumption while efficiently generating sensing signals by amplifying and accumulating voltage differences during both rising and falling periods of the touch driving signal.
Implementation Method 1
at least one feedback capacitor; a first path switching unit configured to connect the feedback capacitor between an inverting input terminal and an output terminal of the amplifier during a rising period of the reference signal; and a second path switching unit configured to connect the feedback capacitor between the inverting input terminal and the output terminal of the amplifier during a falling period of the reference signal
Data Source
AI summary
The disclosure provides an integrator, a touch display device, and a driving method therefor which can perform amplification and integration functions together. The integrator includes an amplifier having a non-inverting input terminal to which a reference signal having a pulse waveform is supplied; at least one feedback capacitor; a first path switching unit configured to connect the feedback capacitor between an inverting input terminal and an output terminal of the amplifier during a rising period of the reference signal; and a second path switching unit configured to connect the feedback capacitor between the inverting input terminal and the output terminal of the amplifier during a falling period of the reference signal, wherein, during each of the rising period and the falling period of the reference signal, a voltage difference between the reference signal and a signal applied to the inverting input terminal of the amplifier is amplified and accumulated, and the amplified and accumulated voltage difference is output.