Touch Screen Electrode Switching for Dual-Mode Sensing
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Solution Overview
Problem
Existing touch screens that combine capacitive and electromagnetic touch sensing suffer from increased thickness, manufacturing costs, and production yield issues due to the layered structure, and experience malfunctions and increased power consumption when using stylus or pen inputs.
Innovation Solution
A touch screen design with separate sensing and driving electrode lines that can switch between capacitive and electromagnetic modes based on input signals, using switches to connect or disconnect electrode pairs, allowing for dual-mode operation with a single driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive touch panel and electromagnetic touch panel are disposed separately with liquid crystal panel in between, then both capacitive and electromagnetic touch sensing can be achieved, but product thickness and manufacturing cost increase
Solution Approach 1:
The patent merges the capacitive touch panel and electromagnetic touch panel into a single integrated structure. The capacitive touch panel includes both capacitive sensing electrodes and electromagnetic sensing electrodes on the same surface, eliminating the need for separate panels and the liquid crystal panel in between, thereby reducing product thickness while maintaining both touch sensing capabilities
Solution Approach 2:
The touch panel is designed with multi-functionality to perform both capacitive touch sensing and electromagnetic touch sensing simultaneously. The same panel structure supports multiple sensing modes through different electrode configurations and signal processing methods, allowing a single device to serve multiple touch sensing functions
2Adaptability or versatility
If capacitive touch panel and electromagnetic touch panel are disposed separately, then both sensing modes are available, but manufacturing cost increases and production yield decreases
Solution Approach 1:
By combining both sensing electrode types into a single panel fabrication process, the patent reduces the number of manufacturing steps, assembly operations, and quality control checks required. This integration simplifies production and reduces manufacturing costs while improving yield by eliminating the complexity of assembling multiple separate panels
3Adaptability or versatility
If driver for capacitive touch panel and driver for electromagnetic touch panel are driven at the same time, then both sensing modes can operate simultaneously, but power consumption increases
Solution Approach 1:
The patent implements periodic action by alternating between capacitive and electromagnetic sensing modes based on the type of input detected. The system uses a stylus detection mechanism to determine which sensing mode to activate, ensuring that only the necessary driver is active at any given time, thereby reducing overall power consumption while maintaining dual-mode capability
4Measurement precision
If electromagnetic touch panel is used for sensing with stylus or pen, then position detection is accurate, but noise is inputted to capacitive touch panel causing malfunction
Solution Approach 1:
The patent segments the sensing functions by using separate sensing electrodes for capacitive and electromagnetic sensing. The capacitive sensing electrodes are isolated from the electromagnetic sensing electrodes, allowing the system to detect stylus inputs through electromagnetic sensing without introducing noise to the capacitive sensing circuitry, thereby maintaining reliability of both sensing modes
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 design reduces product thickness and manufacturing costs, improves production yield, prevents noise interference, and decreases power consumption by enabling simultaneous capacitive and electromagnetic touch sensing with a single driver.
Implementation Method 1
The capacitive touch panel 20 measures capacitive change before and after a touch to determine whether there is a touch and the coordinates of a touched region
Implementation Method 2
The electromagnetic touch panel 40 includes a plurality of sensing electrodes forming a closed loop and a plurality of driving electrodes forming a closed loop, for generating an electromagnetic field for touch sensing
Implementation Method 3
An induced current, which is generated with a drawing device such as a stylus or a pen, flows in the electromagnetic touch panel 40
Data Source
AI summary
A display device with a touch screen and a method of driving the same are provided. In a method of driving a display device including a touch screen including a plurality of sensing electrode lines and driving electrode lines and operating as an electromagnetic touch mode or a capacitive touch mode according to an input touch signal, the method includes: determining the input touch signal, controlling whether to connect pairs of sensing electrode lines among the sensing electrode lines, and controlling whether to connect pairs of driving electrode lines among the driving electrode lines, according to the touch signal.