The human-computer interface has been a problem since the dawn of computers. As far as smartphones are concerned, the clear winner is the touchscreen. But how did we get here? The proto-touchscreen was the light pen, which was first developed in the 50s and 60s and was available to consumers as an accessory for 8-bit computers in the 80s. The light pen is a simple but clever solution that works only with CRT monitors - it senses the electron beam as it scans across the phosphor drawing the image line by line, pixel by pixel. When the beam is sensed by the pen, the computer just makes a...
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