Capacitive touch screen technology uses electric charge to detect touch input on a screen. It has two types - surface capacitive which uses a uniform conductive coating and projected capacitive which uses a grid of wires. A touch causes a change in capacitance which is measured by controllers to determine the touch location. Capacitive touch screens are widely used due to their high resolution, clarity, and responsiveness with advantages like no need for a keyboard but disadvantages of only working with fingers and lower battery life for large screens.
touch screen technology contains some limitations with it, it is fast, accurate, user friendly and fun to operate .It is being widely accepted. With some modifications, it can completely replace mouse and keyboard completely in the near future.
That is touch screen technology as everything (laptop,desktop,mobiles,ATM machine) each and everything can be used by touch.so how it works.Take a tour of uploaded ppt.
touch screen technology contains some limitations with it, it is fast, accurate, user friendly and fun to operate .It is being widely accepted. With some modifications, it can completely replace mouse and keyboard completely in the near future.
That is touch screen technology as everything (laptop,desktop,mobiles,ATM machine) each and everything can be used by touch.so how it works.Take a tour of uploaded ppt.
It was the touch screens which initially created great foregone are the days when you have to fiddle with the touch screens and end scratching up. Touch screen displays are ubiquitous worldwide. Frequent touching a touchscreen display with a pointing device such as a finger can result in the gradual de-sensitization of the touchscreen to input and can ultimately lead to failure of the touchscreen. To avoid this a simple user interface for Touchless control of electrically operated equipment is being developed. Elliptic Labs innovative technology lets you control your gadgets like Computers, MP3 players or mobile phones without touching them. A simple user interface for Touchless control of electrically operated equipment. Unlike other systems which depend on distance to the sensor or sensor selection this system depends on hand and or finger motions, a hand wave in a certain direction, or a flick of the hand in one area, or holding the hand in one area or pointing with one finger for example. The device is based on optical pattern recognition using a solid state optical matrix sensor with a lens to detect hand motions. This sensor is then connected to a digital image processor, which interprets the patterns of motion and outputs the results as signals to control fixtures, appliances, machinery, or any device controllable through electrical signals.
It was the touch screens which initially created great foregone are the days when you have to fiddle with the touch screens and end scratching up. Touch screen displays are ubiquitous worldwide. Frequent touching a touchscreen display with a pointing device such as a finger can result in the gradual de-sensitization of the touchscreen to input and can ultimately lead to failure of the touchscreen. To avoid this a simple user interface for Touchless control of electrically operated equipment is being developed. Elliptic Labs innovative technology lets you control your gadgets like Computers, MP3 players or mobile phones without touching them. A simple user interface for Touchless control of electrically operated equipment. Unlike other systems which depend on distance to the sensor or sensor selection this system depends on hand and or finger motions, a hand wave in a certain direction, or a flick of the hand in one area, or holding the hand in one area or pointing with one finger for example. The device is based on optical pattern recognition using a solid state optical matrix sensor with a lens to detect hand motions. This sensor is then connected to a digital image processor, which interprets the patterns of motion and outputs the results as signals to control fixtures, appliances, machinery, or any device controllable through electrical signals.
Capacitive touch panel towards simplificationSeekcomponents
The projection type capacitor is the mainstream of the touch screen technology. According to the report points out, capacitance touch panel structure will tend to be simplified in the next few years, sensing carrier will be reduced, it will be beneficial to the development of portable mobile devices. Facilitation project design of capacitance touch is in two ways, one issensor-on-cover or called one glass solution, and the other is the panel embedded type touch (in/on-cell). "
Explains about touch screen sensor and its operation with the controller, types of touch sensor and its differentiation, advantages & disadvantages and its applications in day today life.
Distance measuring unit with zigbee protocol, Ultra sonic sensorAshok Raj
With Zigbee protocol, developed a distance measurement unit using an ultrasonic sensor, Arduino and X-bee trans-receiver for communication between displays and monitoring unit.
Software used: Arduino
Mostly and must needed equipment for water tank in our house or industry. Water level indicator not only indicates the water level but also switch OFF and ON the power supply to water pump automatically. Most Demanded and easiest project to built. Can be constructed by beginner.
It is a simple innovative idea which demonstrates how to design a simple circuit which can act as a WATER LEVEL INDICATOR. It is a general idea and can be even modified to build an AUTOMATIC ON/OFF CIRCUIT as the water starts overflowing by implementing a simple JK-flip-flop in the circuit.
Study of Various Touch Screen TechnologiesSantosh Ankam
Study of different types of touch screen technologies, their history, advantages, disadvantages, working, functionalities, comparison, examples, components, hardware, explanations, future scope, pro and cons.
A touch screen is a computer display screen that is sensitive to human touch, allowing a user to interact with the computer by touching pictures or words on the screen.
In 1971, the first "Touch Sensor" was developed by Doctor Sam Hurst (founder of Elographics) while he was an instructor at the University of Kentucky.
A touchscreen is an electronic visual display that the user can control through simple or multi-touch gestures by touching the screen with a special stylus/pen and-or one or more fingers.
2. Introduction
History
Components of Touch Screen
Capacitive touch screen technology
Types of Capacitive touch screen
Advantages & Disadvantage
Applications
Future Scope
Conclusion
Outline:
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3. Introduction
A touch screen is a computer display screen that is
sensitive to human touch, allowing a user to interact
with the computer by touching pictures or words on
the screen.
A touch screen is an input device that allows users to
operate a PC by simply touching the display screen
which has a sensitive glass overlay placed on it.
A touch screen accepts direct onscreen inputs.
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4. History
In 1965, the first "touch screen"
was developed by E.A. Johnson .
In 1971, the first “transparent touch
screen" was developed by Dr . Sam
Hurst.
The University of Kentucky
Research Foundation named it as
“Elo-graph”.
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5. Components of Touchscreen
(How Does A Touchscreen Works?)
A basic touch screen has three main components:
Touch Sensor
Controller
Software Driver
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6. Touch Sensor
The sensor generally has an
electrical current or signal
going through it and touching
the screen causes a voltage or
signal change.
A touch screen sensor is a
clear glass panel with a touch
responsive surface which is
placed over a display screen.
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7. Controller
The controller is a small PC
card that connects between the
touch sensor and the computer.
It takes information from the
touch sensor and translates it
into information that computer
can understand.
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8. Software Driver
The driver is a software that allows the touch screen
and computer to work together.
It tells the operating system how to interpret the touch
event information that is sent from the controller.
Most touch screen drivers today are mouse-emulation
type drivers. This makes touching the screen the same
as clicking your mouse at the same location on the
screen.
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11. Surface Capacitive Touch Screen
Technology
In the capacitive system, a layer that stores electrical
charge is placed on the glass panel.
When a user touches, some of the charge is transferred
to the user, so the charge on the capacitive layer
decreases.
This decrease is measured in electrodes located at
each corner of the monitor.
The computer then calculates the coordinates, from
the relative differences in charge at each corner.
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12. Contd.
Surface capacitive technology consists of a
uniform conductive coating on a glass panel.
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13. Contd.
A finger touch draws
current from each
corner.
Then the controller
measures the ratio of the
current flow from the
corners and calculates
the touch location.
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14. Projected Capacitive Touchscreen
Projected capacitive touchscreens
have front and back protective
glass providing optical and
strength enhancement options.
Its middle layer consists of a
laminated sensor grid of micro-
fine wires, and
optical enhancement options.
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15. Contd.
During a touch, capacitance forms between the
finger and the sensor grid. The embedded serial
controller in the touchscreen calculates touch
location coordinates and transmits them to the
computer for processing.
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20. Conclusion
Though the capacitive touch screen technology contains
some limitations. it’s very user
friendly, fast, accurate, easy for the novices & fun to
operate.
Touchscreens, touch panels or touchscreen panels are
display overlays which have the ability to display and
receive information on the same screen.
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