Archive for March 11, 2010

hi dear ones,

Touch screen

Touch Screen

Touch screen is an electronic visual display that can detect the presence and location of a touch within the display area. The term generally refers to touch or contact to the display of the device by a finger or hand. Touchscreens can also sense other passive objects, such as a pen. However, if the object sensed is active, as with a light pen, the term touchscreen is generally not applicable. The ability to interact physically with what is shown on a display (a form of “direct manipulation”) typically indicates the presence of a touchscreen.

The touchscreen has two main attributes. First, it enables one to interact with what is displayed directly on the screen, where it is displayed, rather than indirectly with a mouse or touchpad. Secondly, it lets one do so without requiring any intermediate device, again, such as a stylus that needs to be held in the hand. Such displays can be attached to computers or, as terminals, to networks. They also play a prominent role in the design of digital appliances such as the personal digital assistant (PDA), satellite navigation devices, mobile phones, and video games.

Touchscreens are popular in heavy industry and in other situations, such as museum displays or room automation, where keyboard and mouse systems do not allow a satisfactory, intuitive, rapid, or accurate interaction by the user with the display’s content.

Historically, the touchscreen sensor and its accompanying controller-based firmware have been made available by a wide array of after-market system integrators and not by display, chip or motherboard manufacturers. With time, however, display manufacturers and chip manufacturers worldwide have acknowledged the trend toward acceptance of touchscreens as a highly desirable user interface component and have begun to integrate touchscreen functionality into the fundamental design of their products.


There are a number of types of touchscreen technology.


Surface acoustic wave


  • Surface capacitance
  • Projected capacitance

Strain gauge

Optical imaging

Dispersive signal technology

Acoustic pulse recognition

 Coded LCD: Bidirectional Screen


Working of Touch Screen
Touch screen has 3 main components: a touch sensor, a controller and a software driver. To make a complete touch input system, a touch screen is combined with a display and a PC or other device.

1) Touch screen censor
A touch screen sensor is a glass plate having touch responsive surface. The touch sensor is positioned over a display screen so that the responsive area of the plate covers the maximum viewable area of the video screen. There are number of touch sensor technologies available in the market today, each using a different approach to detect touch input. The sensor has an electrical current or signal passing through it and touching the screen causes change in voltage or signal. This voltage or signal change is used to find out the location of the touch to the screen.

2) Controller
The controller used in touch screen is a small PC card that interconnects between the touch sensor and the PC. Controller takes data from the touch sensor and converts it into information that PC can understand. For integrated monitors, the controller is usually installed inside the monitor or it is placed in a plastic case for external touch add-ons/overlays. The controller is useful to determine what type of interface/connection you will need on the PC. Integrated touch monitors are provided with an extra cable connection on the back for the touch screen. Controllers are available by connecting to a Serial/COM port (PC) or to a USB port (PC or Macintosh).

3) Software Driver
The driver is software for the PC system that permits the touch screen and computer to work together. It tells operating system of computer how to interpret the touch event information that is sent from the controller. Today’s touch screen drivers 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 permits the touch screen to work with existing software and provide new applications to be developed without the need for touch screen specific programming. Some devices such as thin client terminals, DVD players and specialized computer systems either do not use software drivers or they have their own in -built touch screen driver.

Uses of Touch Screen
The touch screen is one of the simplest PC interfaces to use, making it the interface of choice for a large number of applications. Following are uses of touch screen.

1) Public Information Displays
Tourism displays, trade show displays, Information kiosks and other electronic displays are used by large number of people that have little or no computing experience. The touch screen interface is easier to use than other input devices especially for novice users. A touch screen is useful to make your information more easily accessible by allowing users to navigate your presentation by simply touching the display screen.

2) Retail and Restaurant Systems
In retail or restaurant environment, touch screen systems are easy to use so employees can get work done faster and also training time can be reduced for new employees. As input is present right on the screen, valuable counter space can be saved. Touch screens can be used in order entry stations, cash registers, seating, reservation systems and more.

3) Control and Automation Systems
The touch screen device is useful in systems ranging from industrial process control to home automation. Valuable workspace can be saved by integrating the input device with the display. In real-time by simply touching the screen and with a graphical interface, operators can monitor and control complex operations.

4) Computer Based Training
The touch screen interface is more user-friendly than other input devices so overall training time for computer novices and therefore training expense can be reduced. It can also more useful to make learning more fun and interactive, which can lead to a more beneficial training experience for both students and educators.

5) Assistive Technology
The touch screen interface is very useful for those having difficulty using other input devices such as a mouse or keyboard. When touch screen used with software such as on-screen keyboards or other assistive technology, they can help make computing resources more available to people that have difficulty using computers.

Technology 4-Wire SAW 5-Wire Infrared Capacitive
Durability 3 year 5 Year 5 Year 5 Year 2 Year
Stability High Higher High High Ok
Transparency Bad Good Bad Good Ok
Installation Built-in/Onwall Built-in/Onwall Built-in/Onwall Onwall Built-in
Touch Anything Finger/Pen Anything Finger/Pen Conductive
Intense light-resistant Good Good Good Bad Bad
Response time <10ms 10ms <15ms <20ms <15ms
Following Speed Good Low Good Good Good
Excursion No Small Big Big Big
Monitor option CRT or LCD CRT or LCD CRT or LCD CRT or LCD CRT or LCD
Waterproof Good Ok Good Ok Good


Hi dear ones,

Augmented Identity………………….

I know YOU

Augmented ID is a TAT concept that visualizes the digital identities of people you meet in real life. With a mobile device and face recognition software from Polar Rose, Augmented ID enables you to discover selected information about people around you. All users control their own augmented appearance, by selecting the content and social network links they want show to others. Modifying your augmented ID is easier than fixing your hair in real life and, of course, TAT Cascades will make sure you look great.

An application that lets users point a smart phone at a stranger and immediately learn about them premiered at the Mobile World Congress in Barcelona, Spain. Developed by The Astonishing Tribe (TAT), a Swedish mobile software and design firm, the prototype software combines computer vision, cloud computing, facial recognition, social networking, and augmented reality.

TAT built the augmented ID demo, called Recognizer, to work on a phone that has a five-megapixel camera and runs the Android operating system. A user opens the application and points the phone’s camera at someone nearby. Software created by Swedish computer-vision firm Polar Rose then detects the subject’s face and creates a unique signature by combining measurements of facial features and building a 3-D model. This signature is sent to a server where it’s compared to others stored in a database. Providing the subject has opted in to the service and uploaded a photo and profile of themselves, the server then sends back that person’s name along with links to his/her profile on several social networking sites, including Twitter or Facebook. The Polar Rose software also tracks the position of the subject’s head–TAT uses this information to display the subject’s name and icons for the Web links on the phone’s screen without obscuring her face.

Applying image and face recognition to the trend of posting photos on social networking sites opens up interesting new possibilities.

Polar Rose’s algorithms can run on the iPhone and on newer Android phones, The augmented ID application uses a cloud server to do the facial recognition primarily because many subjects will be unknown to the user (so there won’t be a matching photo on the phone), but also to speed up the process on devices with less processing power.



Augmented reality (AR) is a term for a live direct or indirect view of a physical real-world environment whose elements are augmented by virtual computer-generated imagery. It is related to a more general concept called mediated reality in which a view of reality is modified (possibly even diminished rather than augmented) by a computer.

In the case of Augmented Reality, The augmentation is conventionally in real-time and in semantic context with environmental elements, such as sports scores on TV during a match. With the help of advanced AR technology (e.g. adding computer vision and object recognition) the information about the surrounding real world of the user becomes interactive and digitally usable. Artificial information about the environment and the objects in it can be stored and retrieved as an information layer on top of the real world view

This new technology, called augmented reality, blurs the line between what’s real and what’s computer-generated by enhancing what we see, hear, feel and smell.

create your own world