DAC with feedback control for current source bias during non-display period
 A D/A converter of a current output type desirably compensates for changes in the switching characteristic that arise in each constant current circuit. The D/A converter generates an analog output current that is in response to the level of input digital data and outputs it from an output side by switching each of output currents of a plurality of constant current circuits either to the output side or to a non-output side, in response to the input digital data. The D/A converter performs feedback control, for values of the output currents for the constant current circuits, based on an analog output current at the non-output side during a period when the output currents of all of the constant current circuits are connected to the non-output sides. 
International Business Machines Corporation
H H
H03M H03M
inventional additional
Asao Seiji Tohru Yasusuke
Terukina Koyama Nozawa Suzuki