10-12-2012, 01:34 PM
Touch Screen Sensor
[attachment=43221]
How Does a Touchscreen Work?
A basic touchscreen has three main components:
1 Touch sensor;
2 Controller;
3 Software driver.
The touchscreen is an input device, so it needs to be combined with a display and a PC or other device to make a complete touch input system.
Touch Sensor
A touch screen sensor is a clear glass panel with a touch responsive surface. The touch sensor/panel is placed over a display screen so that the responsive area of the panel covers the viewable area of the video screen. There are several different touch sensor technologies on the market today, each using a different method to detect touch input. The sensor generally has an electrical current or signal going through it and touching the screen can cause a voltage or signal change. This change is used to determine the location of the touch to the screen.
Controller
The controller connects between the touch sensor and the PC. It takes information from the touch sensor and translates it into information that PC can understand. The controller determines what type of interface/connection you will need on the PC. Controllers are available that can connect to a Serial/COM port (PC) or to a USB port. Specialized controllers are also available that work with DVD players and other devices.
Software Driver
The driver allows the touchscreen and computer to work together. It tells the computer's operating system how to interpret the touch event information that is sent from the controller. Most touch screen drivers today are a mouse-emulation type driver. This makes touching the screen as same as clicking your mouse at the same location on the screen. This allows the touchscreen to work with existing software and allows new applications to be developed without the need for touchscreen specific programming.
Touchscreen Technology
Resistive touchscreen
Capacitive touchscreen
Infrared touchscreen
Surface acoustic wave (SAW) touchscreen
Strain gauge touchscreen
Optical imaging touchscreen
Dispersive signal technology touchscreen
wire resistive touchscreen
The construction of the panels are similar with 4-wire technology, but for a 5-wire touch screen all four bus bars are connected to the lower, non-flexible layer of the screen. The flexible layer is always used as a sense layer to read the voltage connection point to the bottom layer.
[attachment=43221]
How Does a Touchscreen Work?
A basic touchscreen has three main components:
1 Touch sensor;
2 Controller;
3 Software driver.
The touchscreen is an input device, so it needs to be combined with a display and a PC or other device to make a complete touch input system.
Touch Sensor
A touch screen sensor is a clear glass panel with a touch responsive surface. The touch sensor/panel is placed over a display screen so that the responsive area of the panel covers the viewable area of the video screen. There are several different touch sensor technologies on the market today, each using a different method to detect touch input. The sensor generally has an electrical current or signal going through it and touching the screen can cause a voltage or signal change. This change is used to determine the location of the touch to the screen.
Controller
The controller connects between the touch sensor and the PC. It takes information from the touch sensor and translates it into information that PC can understand. The controller determines what type of interface/connection you will need on the PC. Controllers are available that can connect to a Serial/COM port (PC) or to a USB port. Specialized controllers are also available that work with DVD players and other devices.
Software Driver
The driver allows the touchscreen and computer to work together. It tells the computer's operating system how to interpret the touch event information that is sent from the controller. Most touch screen drivers today are a mouse-emulation type driver. This makes touching the screen as same as clicking your mouse at the same location on the screen. This allows the touchscreen to work with existing software and allows new applications to be developed without the need for touchscreen specific programming.
Touchscreen Technology
Resistive touchscreen
Capacitive touchscreen
Infrared touchscreen
Surface acoustic wave (SAW) touchscreen
Strain gauge touchscreen
Optical imaging touchscreen
Dispersive signal technology touchscreen
wire resistive touchscreen
The construction of the panels are similar with 4-wire technology, but for a 5-wire touch screen all four bus bars are connected to the lower, non-flexible layer of the screen. The flexible layer is always used as a sense layer to read the voltage connection point to the bottom layer.