ABSTRACT
This chapter discusses the operation principles and fabrication of active matrix liquid-crystal displays (LCDs). Semiconductors such as CdSe are compatible with standard processing in the microelectronics industry, which uses mainly silicon as the semiconductor material. The chapter describes the sensor structure, fabrication, and characteristics of the sensors. The active matrix LCD and sensor technology presented in this chapter can be used alone or in combination for future exciting products such as two-dimensional flat scanners, ultrathin copying systems, and optical computers. An ultrathin copying system could be realized by combining large-area circuit elements like the two-dimensional imager and the active matrix LCD just described with a silver halide-based one-shot color-photosensitive material. Thin-film transistors with amorphous silicon, polycrystalline silicon, and CdSe film as the semiconductor material have been developed to function as the pixel switch at the periphery of each otherwise transparent pixel.
