Seminar PPT for touchscreen technology - Download as Powerpoint Presentation .ppt /.pptx), PDF File .pdf), Text File .txt) or view presentation slides online. This is to certify that the Seminar topic titled â€œBLACK BOXâ€ is a bonafied Touch screen technology can be used as an alternative user interface with. Get More Information about Touch Screens PPT PDF by visiting this link. Touch technology turns a CRT, flat panel display or flat surface into a dynamic data.
|Language:||English, Spanish, Japanese|
|ePub File Size:||20.52 MB|
|PDF File Size:||18.46 MB|
|Distribution:||Free* [*Sign up for free]|
Download Touch Screen Technology seminar report, ppt, pdf, Touch Screen Technology PPT, Touch Screen Technology Topics, Abstracts, Documentation. http://articles, portal7.info lowcards-com-default-rates. Page 3. I FECIT. OLI NTHOOL. Single Touch. Page 4 . ||. Seminar report. On. Touch Screen Technology. Submitted in partial fulfillment of the requirement for the award of degree of ECE. SUBMITTED TO: SUBMITTED.
Tech 3 rd Year 6 th sem Roll No. In , Elographics developed and patented five-wire resistive technology, the most popular touch screen technology in use today. 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 other device to make a complete touch input system. Touch Sensor: Touch Sensor A touch screen sensor is a clear glass panel with a touch responsive surface. The touch sensor is placed over a display screen so that the responsive area of the panel covers the viewable area of the video screen.
Resistive Touch Screens Analog resistive touch technology is comprised of a glass overlay that fits exactly to the shape of a flat panel display. The exterior face of the glass is coated with a conductive, transparent layer. A clear, hard coated plastic sheet is then suspended over the glass overlay. The interior face of the plastic sheet is also coated with a conductive layer. Between the glass and the plastic sheet there are thousands of tiny separator dots about one-one thousandth of an inch thick.
When a stylus applies pressure to the surface of the display, the two layers make contact and a controller instantly calculates X and Y coordinates. This accounts for resistive overlay's very high touch recognition resolution. Capacitive overlay systems operate by way of a conductive stylus and require the use of the human finger or stylus.
It is covered with a coat of transparent metal oxide but the coat is bonded to a single sheet of glass making it susceptible to scratches, which will jeopardize the integrity of the touch screen.
A touch on the screen creates a capacitive coupling, drawing an electrical current to the touch point. However, as soon as a glove is placed over the hand, the touch screen is rendered inoperable which eliminates it from being effective in many applications. A polyester cover sheet is tightly suspended over the top of the glass, separated from it by small, transparent insulating dots.
The controller is a small PC card that connects between the touch sensor and the PC. It takes information from the touch sensor and translates it into information that PC can understand.
Integrated touch monitors will have an extra cable connection on the back for the touch screen. Specialized controllers are also available that work with DVD players and other devices. The driver is a software update for the PC system that allows the touch screen 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 the same as clicking your mouse at the same location on the screen. This allows the touch screen to work with existing software and allows new applications to be developed without the need for touch screen specific programming. There are a variety of types of touch technology available but the five major ones include analog resistive, capacitive, infrared, acoustic wave and near field imaging. Of these only one may actually be appropriate for your application.
Analog resistive touch technology is comprised of a glass overlay that fits exactly to the shape of a flat panel display. The exterior face of the glass is coated with a conductive, transparent layer. A clear, hard coated plastic sheet is then suspended over the glass overlay.
The interior face of the plastic sheet is also coated with a conductive layer. Between the glass and the plastic sheet there are thousands of tiny separator dots about one-one thousandth of an inch thick.
When a stylus applies pressure to the surface of the display, the two layers make contact and a controller instantly calculates X and Y coordinates. This accounts for resistive overlay's very high touch recognition resolution. An 8-wire analog resistive touch screen has held up to more than 35 million touches in laboratory environments, although most are officially rated over 1 million touches.
Capacitive overlay systems operate by way of a conductive stylus and require the use of the human finger or stylus. It is covered with a coat of transparent metal oxide but the coat is bonded to a single sheet of glass making it susceptible to scratches, which will jeopardize the integrity of the touch screen. A touch on the screen creates a capacitive coupling, drawing an electrical current to the touch point.
However, as soon as a glove is placed over the hand, the touch screen is rendered inoperable which eliminates it from being effective in many applications. Formed to fit the shape of a display, the glass panel has a coating of uniform resistivity.
A polyester cover sheet is tightly suspended over the top of the glass, separated from it by small, transparent insulating dots. The cover sheet has a hard, durable coating on the outer side and a conductive coating on the inner side. With a light touch, the conductive coating makes electrical contact with the coating on the glass.
The controller circuit applies a voltage gradient across the resistive surface of the glass. The voltages at the point of contact are the analog representation of the position touched. The controller digitizes these voltages and transmits them to the computer for processing.
By using 4 wires, a pair of wires on each layer, both signals of X and Y are registered by the controller. When a touch occurs. The touch point introduces a pair of voltages for X and Y direction. The Analog-to-Digital Converter ADC , which is located on the controller, is then converts these voltage positions into digital numbers. The device driver calculates these digital numbers into display X,Y coordinate. Puts the mouse cursor onto the X,Y coordinate.
Also returns the operating system with mouse left- button-down status, and left-button-up status while untouched is occurred.
Durable hard-coat front surface can be non glare treated for reflection control or polished for maximum clarity. Touch screens and controllers are safety agency-approved components, so certification of your system is easier. The SAW touch screen is a glass overlay with transmitting and receiving piezoelectric transducers for both the X and Y-axes.
The touch screen controller sends a 5 MHz electrical signal to the transmitting transducer, which converts the signal into surface waves. These mechanical waves are directed across the opposite side gather and direct the waves to the receiving transducer, which reconverts them into an electrical signal.
When the front surface of the touch screen is touched, a portion of the mechanical wave is absorbed, thus changing the received signal. The signal is then compared to a stored reference signal, the change recognized, and a coordinate calculated. This process happens independently for both the. X and Y-axes. By measuring the amount of the signal that is absorbed, a Z- axis is determined. Acoustic wave touch screens have transducers that emit ultrasonic sound waves along two sides.
Guided acoustic wave GAW systems function by the transmission of an acoustic wave through a glass overlay on a display surface, and surface acoustic wave systems SAW function by the transmission of an acoustic wave over a glass overlay on a display surface. When an input device, such as a finger, dampens the wave, electronic sensors determine the location of the dampened area, recognizing a touch.
SAW touch screen monitors have significant stylus limitations. A stylus is the actual device, which touches the displays screen. These systems require a soft, energy absorbing pressure that would come from a finger. Although the human finger is the most popular stylus, often it is desirable to have a pen- based stylus so the display does not become dirty.
In this case, if trying to use a pen, the acoustic wave would not be dampened and no touch would be recognized. Infrared touch screen monitors are based on light-beam interruption technology. When the touch screen is not being touched, the voltage on the coversheet is zero.
The voltage level of the coversheet is continuously converted by the analog-to-digital converter ADC and monitored by the microprocessor on the controller. When the touch screen is touched, the microprocessor detects the rise in the coversheet voltage and begins converting the coordinates as follows:. An analog voltage proportional to the X horizontal position of the touch appears on the cover sheet at pin S of the touch screen connector.
This voltage is digitized by the ADC and subjected to an averaging algorithm, then stored for transmission to the host. An analog voltage proportional to the Y vertical position of the touch now appears on the coversheet at pin S of the touch screen connector.
This signal is converted and processed as described above for the X position. Something hard like a pen won't work. The touch pad contains a two-layer grid of electrodes that are connected to a sophisticated full-custom mixed signal integrated circuit IC mounted on the reverse side of the pad. The upper layer contains vertical electrode strips while the lower layer is composed of horizontal electrode strips.
The IC measures "Mutual capacitance" from each of the horizontal electrodes to each of the vertical electrodes. A human finger near the intersection of two electrodes modifies the mutual capacitance between them, since a finger has. Position of the finger centroid is precisely determined based on these mutual capacitance changes at various locations and can be detected before a finger actually touches the pad.
Must be touched by finger- will not work with any non-conductive input. Polyester with outside hard surface coating with polished or no glare finish. Glass substrate with uniform conductive coating. Glass panel with transducers are attached to the front surface of the glass.
The SAW touch screen is a glass overlay with transmitting and receiving piezoelectric transducers. The touch pad contains a two-layer of electrodes that are connected to a sophisticated integrated circuit IC mounted on the reverse side of the pad. The resistive material for a resistive touch screen is usually made of a thin-film, Nickel -Phosphorous NiP alloy. In the manufacturing process, about 0. Ohms per square is a dimensionless square area of resistive material, the length and width of the resistor being of equal size, having an Ohmic.
The touch screen is one of the easiest PC interfaces to use, making it the interface of choice for a wide variety of applications. Here are a few examples of how touch input systems are being used today:.
Information kiosks, tourism displays, many people that have little or no computing experience use trade show displays, and other electronic displays. The user-friendly touch screen interface can be less intimidating and easier to use than other input devices, especially for novice users. A touch screen can help make your information more easily accessible by allowing users to navigate your presentation by simply touching the display screen.
Time is money, especially in a fast paced retail or restaurant environment. Touch screen systems are easy to use so employees can get work done faster, and training time can be reduced for new employees.
And because input is done right on the screen, valuable counter space can be saved. Touch screens.
Self-service touch screen terminals can be used to improve customer service at busy stores, fast service restaurants, transportation hubs, and more. Customers can quickly place their own orders or check themselves in or out, saving them time, and decreasing wait times for other customers.
Automated bank teller ATM and airline e-ticket terminals are examples of self-service stations that can benefit from touch screen input. The touch screen interface is useful in systems ranging from industrial process control to home automation.
By integrating the input device with the display, valuable workspace can be saved. And with a graphical interface, operators can monitor and control complex operations in real-time by simply touching the screen.
Because the touch screen interface is more user-friendly than other input devices, overall training time for computer novices,.