Thin-film circuits for scanning image-sensor arrays

Integrated circuits for scanning a photosensitive array at standard television scan rates have been fabricated by evaporated thin-film techniques. These include: 1) A 264-stage parallel-output complementary shift register with a driver stage at each output. 2) A 256-output transistor decoder with video coupling circuits for scanning an array with line storage. A single line of 256 photoconductordiode elements has been included on the same substrate with the decoder. The complementary shift register has been demonstrated to operate at clock frequencies up to 100 kHz. The integrated decoder and line sensor, when driven by two external 16-stage shift registers, has been operated successfully with line storage at frequencies up to 4.8 MHz.