Title: Semiconductor device and its drive method
Application Number: 00137354 Application Date: 2000.12.27
Publication Number: 1308311 Publication Date: 2001.08.15
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G02F1/133;G02F1/136;G09G3/32;H01L27/02
Applicant(s) Name: Semiconductor Eergy Laboratory Co., Ltd. Address:
Inventor(s) Name: Hiroki Masaki
Attorney & Agent: zhang zhicheng
Abstract:
    The object is to realize format conversion in inputting an image signal corresponding to conventional low resolution (hereafter referred to as a video signal) to an active matrix semiconductor display device or to a passive matrix semiconductor display device corresponding to recent high resolution, and at the same time to provide a novel method of driving capable of improving the resolution in an outline portion of an image. With the driving method of the present invention, conversion of a screen size which is not capable of being completely performed by only lowering a clock frequency, can be completely performed by artificially reducing the number of scans of gate signal lines in accordance with outputting a gate selection pulse at a timing for simultaneously selecting a plurality of gate signal lines using a modulated clock signal in which a clock signal has been modulated at a constant period. Simultaneously, by creating shading information in the outline portion in accordance with using a modulated clock in a source signal line driver circuit and a gate signal line driver circuit, the apparent resolution is improved utilizing the Mach phenomenon and the Craik-O
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