Motion Computing or Tablet PC users can select from two different computing alternatives namely, digitizer and touch screen. The latter version allows users to input information quickly and accurately by the touch of a finger, or by the use of a stylus or pen.
The touch screen tablet PC is ideal for monotonous data entry with minimal handwritten effort such as menu or button-driven applications. It is suitable for businesses where durability and speed are the basic requirements for efficient performance. Touch screen applications improve customer service, develop accuracy in order taking, and can be instantaneously accessed using wireless links. Three basic systems are used to recognize a user’s touch namely resistive, capacitive, and surface acoustic wave.
The resistive system is made up of a panel of glass. A metallic layer that is conductive and resistive covers this. These two layers are held apart by spacers, and a scratchproof layer is placed on top of the whole setup. An electrical current runs through the two layers while the monitor is operational. These two layers of screens make electrical contact when the user touches the screen. This enables the computer to calculate the point of contact on the screen because of the electrical field generated due to the contact. The computer calculates the co-ordinates of the point of touch thus enabling translation of the co-ordinates into a language that the computer can understand.
The monitor of a surface acoustic wave system consists of two transducers that are placed on the x and y axis of the computer monitor. These transducers send sound waves to each other and instantly recognize any disturbance in the system when touched thereby locating the spot at which the contact is made. This system allows good quality pictures and an almost near perfect clarity.
The benefits of Touchscreen tablet PC’s include easy and quick accessibility, portability, better customer service in businesses, precision, and ease in operation.
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