Touch Power Management Circuit Using External Voltage Sources
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Solution Overview
Problem
Touch power management circuits in electronic devices, such as smartphones and tablets, consume excessive power due to the need for high voltage signals during pen and finger touch driving periods, leading to increased battery consumption and noise interference.
Innovation Solution
A touch power management circuit that alternates between two power voltages during pen and finger touch driving periods, using external power sources to generate signals with varying intensities, thereby reducing amplifier and compensation circuit power consumption and enhancing pen recognition reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a touch power management circuit uses internal amplifiers and compensation circuits to generate high voltage signals during pen and finger touch driving periods, then the signal quality and touch recognition capability are improved, but the power consumption increases significantly
Solution Approach 1:
The patent extracts the amplification and compensation functions from the touch power management circuit by directly utilizing external power sources (AVDD and NVDD) to generate the touch driving signal. This removes the need for internal amplifiers and compensation circuits, thereby eliminating their power consumption while maintaining signal quality through the inherent high voltage characteristics of the external power sources.
Solution Approach 2:
The external power sources (AVDD and NVDD) inherently provide the high voltage signals needed for touch driving without requiring additional processing or amplification by the touch power management circuit. The system leverages the self-capable nature of these power sources to directly supply the required signal characteristics, reducing the burden on the touch power management circuit and its power consumption.
2Reliability
If a touch power management circuit uses internal amplifiers and compensation circuits to generate high voltage signals, then the signal intensity and noise resistance are improved, but the device complexity increases
Solution Approach 1:
The patent removes the amplifiers and compensation circuits from the touch power management circuit architecture. Instead of using these complex internal components to generate high voltage signals, the design directly utilizes the external power sources (AVDD and NVDD) to provide the necessary signal characteristics, thereby simplifying the overall circuit structure.
Solution Approach 2:
The external power sources (AVDD and NVDD) serve dual purposes: they provide power to the system while simultaneously serving as the direct source of high voltage touch driving signals. This multi-functionality eliminates the need for dedicated amplification and compensation circuits, reducing device complexity while maintaining signal quality.
3Reliability
If a touch power management circuit uses high voltage signals during pen and finger touch driving periods, then the pen recognition reliability is improved, but the battery consumption increases
Solution Approach 1:
The patent extracts the high voltage signal generation function from the touch power management circuit's internal components and directly utilizes the external power sources (AVDD and NVDD). This eliminates the power consumption associated with internal amplifiers and compensation circuits, thereby reducing battery consumption while maintaining the high voltage signal levels necessary for reliable pen recognition.
Solution Approach 2:
The external power sources (AVDD and NVDD) inherently provide the high voltage signals needed for pen touch driving without requiring additional processing or amplification. This self-service capability reduces the power consumption of the touch power management circuit and consequently reduces overall battery consumption while maintaining pen recognition reliability.
Data Source
AI summary
The present disclosure relates to a touch power management circuit and a touch driving system comprising the same, and more particularly, relates to a touch power management circuit to generate signals required for a touch driving by using voltage sources different in a pen touch driving period and a finger touch driving period in order to reduce power consumption of a display device and a touch driving system comprising the touch power management circuit.