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Touch Panel

Inteltronic offers touch panels to match with your TFT modules. Touch screens are fast becoming the wave of the future, and the momentum doesn’t show any signs of slowing down. As software engineers continue to push for the most user-friendly interfaces, your fingers are quickly becoming the most powerful tools around you. Contact us for our touch panel products. See our Standard TFT with Integrated Touch Panel List.


Inteltronic Touch Screens for your projects:a

*4, 5 wire resistive touch
*Projective Capacity touch
*Surface capacitive
*Wired projective capacitive
*Surface accoustic wave touch
*ITO projective capacitive

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What is a Touch Panel

A touchscreen 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 or stylus.

The touchscreen has two main attributes. First, it enables one to interact directly with what is displayed, rather than indirectly with a cursor controlled by a mouse or touchpad.  Secondly, it lets one do so without requiring any intermediate device that would need to be held in the hand. Such displays can be attached to computers, or to networks as terminals. They also play a prominent role in the design of digital appliances such as phones, computers, handheld monitoring devices, medical and gaming.


     


Example of a computer monitor

With your finger or a pen, when the sensor on the panel is touched, the input is registered as an analog signal. Then, the signal is converted into a digital signal by the controller which can be recognized by the computer device. The touch driver in the computer integrates various components to compile the digital signal for the video card to render the position of the touch event on the display.


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Construction


There are several principal ways to build a touchscreen. The key goals are to recognize one or more fingers touching a display, to interpret the command that this represents, and to communicate the command to the appropriate application.

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In the most popular techniques, the capacitive or resistive approach, there are typically four layers:

1)  Top polyester layer coated with a transparent metallic conductive coating on the bottom

2)  Adhesive spacer

3)  Glass layer coated with a transparent metallic conductive coating on the top

4)  Adhesive layer on the backside of the glass for mounting

          

When a user touches the surface, the system records the change in the electrical current that flows through the display.

There are now many types of touch panels that range from Resistive, Surface Capacitive, Projected capacitive and many more.

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Explanation of the variety of touchscreen technologies:


Resistive: Main article: resistive touchscreen