[8] From 1959 to 1979 he did theoretical work on tunnel diodes, semiconductor device theory and experiment, injection luminescence, field emission, pattern recognition, later turning his interest to thin film technology.

[8][9][10][11] The cathode ray tube, like the brontosaurus, will become extinct, and for the same reason: too much bulk, very little brain.Over the years 1968–79, Brody developed many electronic uses for thin film transistors, including flexible circuits, aircraft power controls, industrial timers and others.

[14] His work at Westinghouse culminated in the invention of active matrix technology, using a CdSe TFT to drive each individual pixel of a flat panel display.

This venture was funded in part by Jerome Wiesner, Richard Leghorn of Itek, and Apple's John Sculley, and won contracts worth $7.8 million from the Defense Advanced Research Projects Agency (DARPA).

[8] A SID award, the Peter Brody Prize was created in 2017 to honor outstanding contributions of young researchers to active matrix information display technology.