Patent ID: 7256760
Filing Date: 2007-08-14
Classification: G02F,G09G,H01L

Abstract:
1. A mobile computer comprising: a camera portion; an image receiving portion; an operation switch; and a display device, wherein the display device comprises: wherein the pixel matrix circuit, the driver circuit and the logic circuit are disposed over the same substrate, wherein the pixel matrix circuit, the driver circuit, and the logic circuit are constituted by a plurality of thin film transistors, each having an active layer comprising crystalline silicon, wherein the active layer of each of the plurality of thin film transistors comprises a plurality of rod-shaped crystals extending in one direction, wherein a thickness of a first gate insulating film of one of the plurality of thin film transistors which is required to drive a circuit at 0.1 GHz or higher is 500 Å or thinner, and a thickness of a second gate insulating film of one of the plurality of thin film transistors which is driven by an operation voltage of 10V or greater is 1000 Å or thicker, and wherein the logic circuit includes at least one selected from the group consisting of a phase comparator, a low pass filter, a voltage controlled oscillator, a frequency divider, a horizontal scanning oscillator, a vertical scanning oscillator, a D/A converter, an I/O port, a differential amplifier, an operational amplifier, a comparator and a memory.