Touch Driving Device Pulse Width Adjustment for Power Reduction
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Solution Overview
Problem
The power consumption of touch driving devices is increased due to frequent object approaches or touches, leading to higher energy usage in display devices.
Innovation Solution
A touch driving device that generates a touch drive signal with a longer pulse width than the conventional method, allowing for multiple samplings of the sensing voltage during the pulse duration, thereby reducing the number of pulses and minimizing power consumption while effectively canceling noise in the sensing voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch driving device frequently samples the sensing voltage to accurately detect object approaches or touches, then the sensing precision is improved, but the power consumption is increased
Solution Approach 1:
The patent applies periodic action by using a longer pulse width for the touch drive signal that encompasses multiple sampling periods. Instead of using short, frequent pulses, the system uses extended periodic pulses where sampling occurs at multiple points within each pulse duration, reducing the overall number of pulses required while maintaining accurate touch detection capability.
2Use of energy by moving object
If the touch driving device uses a longer pulse width to reduce the number of pulses, then the power consumption is reduced, but the sampling frequency during each pulse must be increased
Solution Approach 1:
The patent applies segmentation by dividing the extended pulse duration into multiple sampling intervals. Within each long pulse, the sensing voltage is sampled at multiple discrete time points, allowing the system to gather sufficient measurement data during a single extended pulse cycle, thereby reducing the total number of pulses needed while maintaining detection accuracy.
3Reliability
If multiple sampling points are used within a single pulse period, then noise in the sensing voltage is reduced, but the device complexity increases
Solution Approach 1:
The patent applies merging by combining multiple sampling operations within a single pulse period. The sensing circuit performs multiple voltage measurements during one extended pulse cycle and processes these samples together, achieving noise reduction through multiple measurements without requiring separate dedicated circuits for each sampling event, thus minimizing additional device complexity.
Data Source
AI summary
The present embodiment relates to a touch driving device and a display device including the same, and more particularly, to a touch driving device capable of reducing the power consumption thereof by changing a sampling method thereof and a pulse of a touch drive signal, compared to a conventional touch driving device, and a display device including the same.