A portable computer includes a base unit, and a display unit pivotally connected to the base unit for movement between a closed position and an open position. The LCD driving circuit comprises a digital gamma-correction and inversion circuit for performing a digital gamma-correction process on the digitized video signal and then performing a polarity inversion process on selected lines of the video signal. The illumination optics module includes a one-dimensional optical transform element having a pupil plane. The gate voltage of the second transistor is supplied by a feedback circuit which provides that the current through the first and second transistors is substantially equal. Sourcedrain contacts are electrically coupled with opposite ends of the semiconducting carbon nanotube to complete the device structure.