26-07-2012, 11:36 AM
TOUCH SCREEN TECHNOLOGY
TOUCH SCREEN TECHNOLOGY.pptx (Size: 498.53 KB / Downloads: 52)
INTRODUCTION
Works with the principle of CRT (Cathode Ray Tube) technology
Input device --> Operates a PC by simply touching the display screen.
Made of sensitive glass overlay & desired inputs can be given by touching it.
Inputs --> External (light pen) or an internal device (touch overlay and controller) .
TOUCH SENSORS
Touch sensor --> In between clear glass panels.
Responsive area --> Entire viewable area of the display screen.
Sensors --> Detects electrical current or signal.
Touching -->causes a voltage or signal change, thereby the location can be determined.
SOFTWARE DRIVER
Acts as a bridge --> Screen and processor.
Makes the operating system --> To interpret the touch event information.
Touch screen drivers today --> Mouse-emulation type driver ( like touching the screen the same as clicking mouse)
Recent research --> To make it as PNP
RESISTIVE TOUCH SCREENS
1. Polyester Film.
2. Top Resistive Layer.
3. Conductive Transparent Metal Coating.
4. Bottom Resistive Layer
5. Insulating Dots .
6. Glass Substrate
WORKING OF RESISTIVE SENSORS
Resistive touch screen monitor composed of :
Flexible top layer
Rigid bottom layer
Insulating dots
Along with touch screen controller.
Top & Bottom layers --> transparent metal oxide coating.
Pressure over the flexible top sheet --> Makes electrical contact between the resistive layers & the switch closing in the circuit.
Controller --> Alternating voltages & converts them into the digital X and Y coordinates.
WORKING OF SURFACE WAVE SENSORS
Contains Transmitting and receiving transducers
Touchscreen controller --> 5 MHz electrical signal to the transmitting transducer.
Converts electrical signal --> ultrasonic waves within the glass.
Waves --> Directed across the front surface of screen.
Reflectors - -> Reflects & directs towards receiving transducer.
Receiving transducer --> reconverts --> An electrical signal & digitally maps the touchscreen.
TOUCH SCREEN TECHNOLOGY.pptx (Size: 498.53 KB / Downloads: 52)
INTRODUCTION
Works with the principle of CRT (Cathode Ray Tube) technology
Input device --> Operates a PC by simply touching the display screen.
Made of sensitive glass overlay & desired inputs can be given by touching it.
Inputs --> External (light pen) or an internal device (touch overlay and controller) .
TOUCH SENSORS
Touch sensor --> In between clear glass panels.
Responsive area --> Entire viewable area of the display screen.
Sensors --> Detects electrical current or signal.
Touching -->causes a voltage or signal change, thereby the location can be determined.
SOFTWARE DRIVER
Acts as a bridge --> Screen and processor.
Makes the operating system --> To interpret the touch event information.
Touch screen drivers today --> Mouse-emulation type driver ( like touching the screen the same as clicking mouse)
Recent research --> To make it as PNP
RESISTIVE TOUCH SCREENS
1. Polyester Film.
2. Top Resistive Layer.
3. Conductive Transparent Metal Coating.
4. Bottom Resistive Layer
5. Insulating Dots .
6. Glass Substrate
WORKING OF RESISTIVE SENSORS
Resistive touch screen monitor composed of :
Flexible top layer
Rigid bottom layer
Insulating dots
Along with touch screen controller.
Top & Bottom layers --> transparent metal oxide coating.
Pressure over the flexible top sheet --> Makes electrical contact between the resistive layers & the switch closing in the circuit.
Controller --> Alternating voltages & converts them into the digital X and Y coordinates.
WORKING OF SURFACE WAVE SENSORS
Contains Transmitting and receiving transducers
Touchscreen controller --> 5 MHz electrical signal to the transmitting transducer.
Converts electrical signal --> ultrasonic waves within the glass.
Waves --> Directed across the front surface of screen.
Reflectors - -> Reflects & directs towards receiving transducer.
Receiving transducer --> reconverts --> An electrical signal & digitally maps the touchscreen.