Touch screen LCD monitor – how does it work?
Touch screen monitors are a device by which we give inputs and take outputs as information without using any other external device. Instead of using a keyboard or mouse.
A touch screen is a display which 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. Touch screens can also sense other passive objects, such as a stylus.
The touch screen has two main qualities. First, it allows you to interact with what is displayed directly on the screen, where it is displayed, rather than indirectly with a mouse (computing) 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.
Touch screen monitors are used in a variety of different applications including POS (point of sale) cash registers, PDA’s (personal digital assistants), ATM’s, car navigation screens, cell phones, gaming consoles and any other type of appliance that requires you to input and receive information.
Types of technology available in Touch Screen. The commonly used are underneath:
- Resistive Touch monitors
A resistive touch screen monitor usually has a coat of very thin electrically conductive and resistive layer of metal. When pressed, the change in electrical current can be measured and the input processed by a computer. While very affordable they only offer about 75% clarity, they can also be easily damaged by objects that are sharp. Resistive touch screen monitors are the most popular types of touch screen monitors used today. They are usually not effected by dust or liquids which make them very reliable.
- Surface Wave Touch Screen Monitors
Surface wave touch screen monitors use ultrasonic waves to process inputs from the screen. Ultrasonic waves flow over the touch screen, when a person touches the pad at a specific location, the wave is absorbed and immediately processed by the computer. While not as common as resistive touch panels, they are used in certain applications. Dust and water can contaminate a surface wave touch screen so it is important to keep the screens properly maintained.
- Capacitive Touch Screen Monitors
Capacitive touch screens are coated with indium tin oxide. This material provides a continuous current across the screen. The current is precisely controlled throughout the touch pad and can be measured by the computer processor, when touched; the screen is able to send the processor specific coordinates to input information correctly. It is important to note that specific objects can only be used on capacitive touch screens. You can not use a stylus or a pencil for instance; usually you will need a bare finger. Capacitive touch screens have high clarity and are not affected by dust or liquids.
- Infrared Touch Screen Monitors
There are two types of Infrared touch screen monitor screens, the first reacts to infrared or thermal waves (heat), unfortunately this technology is slow and does not work well with cold hands or objects. The second type of Infrared touch screen monitors use vertical and horizontal infrared sensors around the perimeter of the touch screen. Creating a grid, the touch screen is able to pinpoint the exact location of where the screen has been touched and send that information to the computer for processing. Infrared touch screen monitors are very durable and are used for industrial and military applications.
Introducing the Walky concept.
Walky software controls a robot trough iPhone’s touch screen software.
Yuta Sugiura and his colleagues from Keio University, have developed a new concept for controlling robots and virtual characters.
Bipedal walking robot mimics the human walking where fingers are used as analogy to human legs.
Walky can be used to control walking, turning, jumping, kicking and sidestepping. All this with natural finger gestures as interface.
Finger actions are captured, sent to Walky touch screen software and transferred to the robot.
This provides a very intuitive controlling interface, since users don’t need to go through a learning cycle, to understand the instructions.
While it’s nice to see the fast development in touch screen hardware, software vendors will need to create more finger-friendly touch screen software, for finger and pen computing to catch up. One promising example is ASUS’s Touch Gate software.
Touch Gate software is a replacement for the default Windows desktop.
The main interface is designed as a 3-sided cube. The main sections are:
- standard windows explorer desktop,
- touch enabled applications and
- web widgets.
You can move between screens by flipping with your finger over a window.
The main section includes a large row of icons, that lead you to five applications.
Pressing the button in the bottom shows you all applications.
Configuring the toolbar is easy and fun. Available applications are displayed on a carousel, which you spin around, then move the desired application to desired location.
ASUS tries to make web browsing more finger friendly by providing a virtual keyboard and zooming support for Internet Explorer.
PhotoFun lets you view photos in different ways. Arranged in rows or scattered around the desktop. You can use your fingers to move them around, re-size or rotate them. It even allows you to create instant photo albums.
When browsing trough your book-like album, you may flip the pages with your finger, with realistic eye-candy animation.
Sticky notes allow you to hand-write reminders and stick them to your desktop. You can even share them across Eee PCs.
In addition to Journal, Sticky Notes are the only application that supports palm rejection.
You can position Yahoo widgets (like weather widget or battery life indicator) on the background and drag them around.
Most of the icons are big and work great with fingers. Pressure sensitivity is supported in most applications (but must be manually activated). Palm rejection, on the other hand, could be supported in more applications.
While new interfaces usually have a big learning curve, Touch Gate software works naturally in intuitively.
Touch screen software still has a long way to go, but examples like Touch Gate show us, it’s time for touch screen computing.
Get it at Amazon: Asus Eee PC T91MT-PU17.
Check some other best selling touch screens, too:
Blogroll – Cool Sites
- Touch Screen Applications from Corel on
- How to Build Your Own Touch Screen Software on
- How to Build Your Own Touch Screen Software on