Alternating Touch Sensing Drivers to Reduce Power and Noise
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Solution Overview
Problem
Display devices with input systems face malfunctions due to noise interference between capacitive and electromagnetic touch sensing, and simultaneous driving of both systems increases power consumption.
Innovation Solution
A method and system that alternately perform electromagnetic and capacitive touch sensing, determining the type of touch information received to drive each sensing type separately for specific periods, using an idle sensor, touch information determiner, electromagnetic touch sensor, and capacitive touch sensor to prevent noise interference and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electromagnetic touch sensing is performed during capacitive touch sensing period, then electromagnetic touch detection is enabled, but noise from electromagnetic panel flows into capacitive touch panel causing malfunction
Solution Approach 1:
The patent implements periodic action by dividing touch sensing into alternating time periods: capacitive touch sensing periods and electromagnetic touch sensing periods. During capacitive sensing periods, electromagnetic sensing is suspended to prevent noise interference, and vice versa. This periodic alternation allows both touch sensing technologies to function without mutual interference, resolving the contradiction between versatility and reliability.
2Adaptability or versatility
If both capacitive and electromagnetic touch panel drivers are driven simultaneously, then both touch types can be detected, but power consumption increases
Solution Approach 1:
The patent applies periodic action by controlling the drivers to operate in alternating periods rather than simultaneously. The capacitive touch driver and electromagnetic touch driver are activated in separate time slots, allowing the system to support both touch types while significantly reducing power consumption compared to continuous simultaneous operation.
Solution Approach 2:
The patent implements dynamics by making the driver operation flexible and adaptive. The system dynamically switches between capacitive and electromagnetic sensing modes based on detected touch presence and type, adjusting driver activation in real-time. This dynamic control enables the system to consume power only when necessary for each specific touch interaction.
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
Prevents touch malfunctions by isolating noise between sensing types and reduces power consumption by controlling the drivers for each touch panel separately.
Implementation Method 1
an induced current flows in the electromagnetic touch panel 20 through the use of a pointing device such as stylus or pen
Implementation Method 2
capacitive touch panel 10, which is an input device capable of determining a location of touch by sensing a change of capacitance between a contact surface of the input device and a part of human body being in contact with the input device
Data Source
AI summary
A display device with an input system and a method of driving the same are provided. The method for driving a display device with an input system includes: receiving touch information, including electromagnetic touch information or capacitive touch information, by alternately performing electromagnetic touch sensing and capacitive touch sensing, if the touch information is the electromagnetic touch information: performing the electromagnetic touch sensing for a first period, and performing the capacitive touch sensing after the first period, and if the touch information is the capacitive touch information, performing the capacitive touch sensing for the first period.