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When a beam is interrupted by a stylus, the photodetectors which no longer are receiving a signal can be used to determine where the interruption is. This touchscreen utilized a matrix of collimated lights shining orthogonally across the touch surface. The first version of a touchscreen which operated independently of the light produced from the screen was patented by AT&T Corporation US 3016421A, Harmon, Leon D, 'Electrographic transmitter', issued. By transcribing what a user draws onto a computer, it could be saved for future use US 3089918A, Graham, Robert E, 'Telewriting apparatus', issued.

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Later inventions built upon this system to free telewriting styli from their mechanical bindings.

Effectively used for temporarily drawing arrows or circles onto a live television broadcast US 2487641A, Denk, William E, 'Electronic pointer for television images', issued. In 1946, a patent was filed by Philco Company for a stylus designed for sports telecasting which, when placed against an intermediate cathode ray tube display (CRT) would amplify and add to the original signal. One predecessor of the modern touch screen includes stylus based systems. This was a further development of the self-capacitance screen (right), also developed by Stumpe at CERN in 1972. The prototype x-y mutual capacitance touchscreen (left) developed at CERN in 1977 by Frank Beck, a British electronics engineer, for the control room of CERN's accelerator SPS ( Super Proton Synchrotron). Display manufacturers and chip manufacturers have acknowledged the trend toward acceptance of touchscreens as a user interface component and have begun to integrate touchscreens into the fundamental design of their products. Historically, the touchscreen sensor and its accompanying controller-based firmware have been made available by a wide array of after-market system integrators, and not by display, chip, or motherboard manufacturers. Touchscreens are found in the medical field, heavy industry, automated teller machines (ATMs), and kiosks such as museum displays or room automation, where keyboard and mouse systems do not allow a suitably intuitive, rapid, or accurate interaction by the user with the display's content.

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The popularity of smartphones, tablets, and many types of information appliances is driving the demand and acceptance of common touchscreens for portable and functional electronics. Touchscreens are also important in educational settings such as classrooms or on college campuses. They play a prominent role in the design of digital appliances such as personal digital assistants (PDAs) and some e-readers.

They can also be attached to computers or, as terminals, to networks. Touchscreens are common in devices such as game consoles, personal computers, electronic voting machines, and point-of-sale (POS) systems. The touchscreen enables the user to interact directly with what is displayed, rather than using a mouse, touchpad, or other such devices (other than a stylus, which is optional for most modern touchscreens).

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The user can use the touchscreen to react to what is displayed and, if the software allows, to control how it is displayed for example, zooming to increase the text size.

Some touchscreens use ordinary or specially coated gloves to work while others may only work using a special stylus or pen. A user can give input or control the information processing system through simple or multi-touch gestures by touching the screen with a special stylus or one or more fingers. The display is often an LCD, AMOLED or OLED display while the system is usually a laptop, tablet, or smartphone. The touch panel is normally layered on the top of an electronic visual display of an information processing system. A touchscreen or touch screen is the assembly of both an input ('touch panel') and output ('display') device.