TouchScreen technology by jayreddy


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INTRODUCTION: Touchscreens are interactive displays that
combine the functions of a monitor, keyboard, and mouse, in effect allowing the display to act as an input device. These interactive displays are often used in public places that are unsuitable for keyboards and mice, for example public service kiosks for drivers license renewals and in movie theatre lobbies where tickets can be purchased from machines equipped with credit/debit card readers. Concerns about theft and vandalism have also influenced the placement of touchscreens in public areas and transportation venues such as trains and airplanes. They are perfectly suited for industrial settings where an instant response may be required, factory areas and automobiles that are exposed to dirt, water, and chemicals, and in gaming consoles. Touchscreens work inseveral different ways: Pressure-sensitive or resistive ViP Interactive - Information point touchscreens incorporate a thin layer of electrically conduct ive material like metal foil. When the screen is touched by a stylus or human hand, the metallic layer deforms and the electric field changes in a way that is registered by the unit's control processor. Resistive touchscreens are vulnerable to being damaged by the malicious use of sharp objects such as pens or knives, but being sealed systems they can stand limited exposure to the elements. Touch screen monitors are no longer confined to bar video games as novelty items. Today, they can be found in many stores as part of cash registers, in car dashboards and on many portable computers. With the growing popularity of touch screen enabled Palm Pilots and other PDAs, many people even have one in his or her pocket at all times. The benefits of such technology are obvious. Rather than lugging along extra input devices such as a mouse or a keyboard, the user need only his finger to manipulate the chosen device. But it's not just mobile devices that benefit from this type of input. All kinds of devices can be equipped, including TV and computer monitors, LCD screens, and the older CRT computer monitors. As a result, a bartender can press on a screen to ring up drinks on a busy night rather than type in a price, a

nurse can input patient information with one hand. Truly, the possibilities with touch screen monitors are endless. Touch screen monitors usually come in three varieties that enable it to recognize a person's touch. These are resistive, capacitive and surface acoustic wave. The resistive type works by having two panels with a thin space between them. When the user presses the screen, the two panels touch at that point, and the exact coordinates are then registered with the computer. A capacitive system runs a small electrical charge throughout the touch screen. When the user touches the chosen area, some of the electrical charge is distributed to the finger, lessening the charge at that location. The coordinates are again recorded and sent to the computer. This type of touch screen produces a clearer picture because it transmits more light and doesn't require two panels.Finally, the surface acoustic wave system is the best, and results in the clearest picture. Transducers are used to send electrical signals across the screen, and if a user touches the screen, they can determine where based on how the electrical signal is received from one transducer to the other. Since the capacitive system must have a finger to absorb electricity, most non-living objects won't register as a touch. Resistive and surface acoustic wave systems on the other hand react to just about any form of pressure. Each has its different advantages as a result, and manufacturers will only find new ways to make use of them. The Chassis Monitor PanelMount™ has been uniquely designed to satisfy the needs of System Integrators/VARs and OEMs/End Users alike. General Digital has achieved this lofty goal by designing the Chassis Monitor PanelMount™ with elegant simplicity, modular adaptability and cost sensitivity.Additionally, the Chassis Monitor PanelMount™ is designed to operate from a single +12V regulated source that can be supplied by the customer, or may be purchased directly from General Digital™. AMTFT LCD Screens General Digital™ integrates the latest advances in LCD display technology from 15.0" to 20.1" (diagonal viewing area) panels. These panels provide the equivalent viewing area of much larger CRTs. All of our active matrix TFT LCD screens offer a minimum of 262,000 colors, a wide viewing angle, and fast response time (suitable for live video). We qualify multiple sources of supply to ensure product availability and long life. Video Support All standard Chassis Monitor PanelMount™ units support non-

interlaced analog video (separate, composite, sync-on-green). Interlaced video is supported as a standard feature on all models. Also supported is STANAG 3350 A analog RGB interlaced sync-on-green video. Live Video Support The Chassis Monitor PanelMount™ can be optionally configured to support NTSC, SECAM, PAL and RS-170 video in composite video or S-video format. The response time of the active matrix TFT makes it the ideal platform for live video input. Protective Glass and Sealed Gasket General Digital™ protects your display by adhering a piece of glass to the surface of the LCD panel to guard the liquid crystal material from making direct contact with foreign objects. In addition, a sealed gasket is installed between the display and bezel to protect the monitor’s electronics from dust, liquids (e.g., spilled coffee) or other debris. Metal Construction The rugged panel mount bezel withstands harsh treatment and facilitates drop-in installation. The optional industrial enclosure of the Chassis Monitor PanelMount™ adds an extra layer of protection for the monitor’s display and electronics. The Chassis Monitor™ product line is also available as a kit, standalone or rack mount device. Total Design Control General Digital™ gladly offers its engineering services to customers who require special customization of our devices to meet their commercial, industrial or military requirements. Please speak with a Sales Engineer for additional details. Configuration Control & Product Longevity We at General Digital™ are completely responsible for the design and manufacturing of our products, allowing us to maintain nearly total control of their future. Our experience supporting Department of Defense programs has taught us the value of designing products with foresight so that they can be manufactured, serviced and upgraded for many years. Though the market introduces new innovations and product upgrades at an alarming rate, our product management team knows the importance of proactive customer notification and can offer product adaptation with similar or equivalent performance before designs become obsolete, thereby extending the product life cycle. Private Labeling General Digital™ encourages relationships with Original Equipment

Manufacturers (OEMs) and other organizations, and is willing to maintain your company identity High Performance LCD Controller Internal to our LCD monitor is an LCD controller that converts analog video signals into the proper digital signals required to drive the display. It is the LCD controller that enables the LCD monitor to function as a direct replacement for the traditional CRT. The controller provides intuitive operation of its controls and calibration through the use of a membrane pad and a series of on-screen menus. All models support the following display image controls: auto and manual setup, brightness, contrast, horizontal position, vertical position, tuning, size, individual RGB adjust, image expansion on/off, system information, run-time counter, and signal level. Advanced features are supported on a selective basis (image rotate and invert, audio controls, advanced scaling). Options & Accessories A multitude of options and accessories are offered in support of all General Digital™ products: vandal shields, EMI/RFI shields, antireflective/antiglare coatings, touch screens, power supplies, keyboards/pointing devices, rack slides, video/serial/power cables and more. Please speak with a Sales Engineer or visit our Options and Accessories page for further

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