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Touch screen LCD: a modern innovation

Touch screen LCD is the epitome of great innovation in the realm of technology. There are basically two types of displays. The first kind of display is the Cathode Ray Tube or the CRT, which is the conventional one. The other one is Liquid Crystal Display, or what is commonly known as LCD. It is a more modern kind of display technology. People are more familiar with the Cathode Ray Tube which was used in the good old television set. However, LCD is the latest technology in vogue.

Although, it’s a more new type of technology, it has already created ripples in the field of display technology. There are lots of advantages that come with this kind of technology since it saves both space and energy. As compared to the conventional CRT technology, this is more efficient and compact. Some if its other advantages over the CRT display are discussed below.

Advantages of Touch screen LCD display over the CRT display

The CRT Touch screen display is the established predecessor in this case. Whereas the touch screen LCD display is new. However both are widely different from each other owing to the absolutely divergent technologies. The touch screen LCD has an edge over the CRT touch screen display, in terms of size. LCD monitors are quite lightweight and compact. In the context of space occupancy, it is said that an LCD touch screen takes up only one-third of the space as compared to that of a same sized CRT touch screen.

Earlier, only touch screen CRT monitors were available in 17-inch diagonal sizes. But now, LCD touch screens are available in sizes of 15 and 17 inches as well. Because of the flatness of the LCD Touch screens, the viewing area is also much larger when compared to a CRT monitor. This is demonstrated by the fact that in a 17-inch CRT monitor, the viewing area is only abut 16 inches while in an LCD monitor, the viewing area is full 17 inches.

Disadvantages of touch screen LCD

In spite of some great features and advantages of a touch screen LCD, there is one problem. That is, it does not display all colors. Besides, it is also unable to display multiple resolutions as well as it is done by CRT touch screens.

However, despite such limitations, people prefer LCD touch screens. In fact, these days, many people opt for LCD touch screens only, be it for their television sets, computer screens or even mobile phones.

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Touch Screen Monitors

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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.

 

There are many different types of touch screen technology available. The most common types include: Resistive, Surface Wave, Capacitive and Infrared.

 

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