Touch Screen Device Selective Electrode Driving
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Solution Overview
Problem
Existing touch screen technologies consume high power and have long response times when detecting finger touches due to the need to drive all electrodes, similar to pen touches, which increases power consumption and response time.
Innovation Solution
A touch screen device with a touch screen panel and circuit unit that selectively applies driving pulses to only some driving electrodes during finger touch detection, reducing power consumption and response time by distinguishing between finger and pen touch modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driving pulses are applied to all driving electrodes to detect finger touches, then touch detection coverage is improved, but power consumption increases
Solution Approach 1:
The driving electrodes are divided into multiple groups, and only specific groups are selected to receive driving pulses based on the detected touch type. This segmentation allows the system to activate only the necessary electrode groups for finger touch detection, reducing overall power consumption while maintaining adequate detection coverage.
Solution Approach 2:
Instead of applying driving pulses to all driving electrodes, the system applies pulses to only a subset of electrodes (partial action) sufficient for detecting finger touches. This reduces the energy expenditure while still achieving the detection function for the larger finger contact area.
2Measurement precision
If driving pulses are applied to all driving electrodes, then touch detection accuracy is improved, but response time increases
Solution Approach 1:
By segmenting the driving electrodes into multiple groups and selectively activating only the necessary groups based on touch type, the system reduces the total number of electrodes that need to be driven. This segmentation decreases the overall response time while maintaining detection accuracy through intelligent electrode selection.
Solution Approach 2:
The system employs periodic touch sensing operations where the touch type from previous sensing periods is utilized to determine the driving strategy for current periods. This periodic adaptation allows the system to optimize its response by switching between different driving patterns (full electrode activation vs. selective activation) based on detected touch types.
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
The solution reduces power consumption and shortens touch response time by selectively driving electrodes based on touch type, allowing for efficient finger touch detection with lower power usage and faster response speeds compared to traditional methods.
Implementation Method 1
a mutual capacitance is generated between the touch driving areas and the touch sensing areas. Therefore, whether there is a touch is determined by measuring an amount of change in a mutual capacitance based on the touch.
Data Source
AI summary
Disclosed is a touch screen device. The touch screen device includes a touch screen panel configured to include a plurality of driving electrodes, which are disposed in parallel in a first direction, and a plurality of sensing electrodes which are disposed in parallel in a second direction, and a touch circuit unit configured to, when a touch type of a previous touch sensing period is a finger touch, sequentially apply a driving pulse to a plurality of second driving electrodes but not to a plurality of first driving electrodes among the plurality of driving electrodes, and receive a plurality of sensing signals based on the driving pulse from the plurality of sensing electrodes.