Patent ID: 6608642
Filing Date: 2003-08-19
Classification: G06K

Abstract:
A driver IC for supplying driving currents to m groupsÃ—n light-emitting diodes arranged in a row, the driver IC having n first output terminals each connected to first electrodes of m light-emitting diodes (where m&gE;3) and having m second output terminals each connected to second electrodes m light-emitting diodes, the driver IC comprising:a data signal storage circuit for storing temporarily and sequentially at least nÃ—m data signals simultaneously, that are fed thereto; a second driver section for keeping one of the second output terminals at a predetermined potential so as to activate the light-emitting diodes connected to said one of the second output terminals; a control circuit for feeding the second driver section with designation signals for designating one of the second output terminals, and for selecting data signals corresponding to the light-emitting diodes connected to the one of the second output terminals kept at the predetermined potential from among the data signals stored in said data signal storage circuit; a first driver section for outputting the driving currents via the first output terminals in accordance with the data signals selected by the designation signals, wherein the control circuit outputs the designation signals on a basis of control signals fed thereto from outside by way of a number of signal lines fewer than m, and a number of the data signals stored temporarily and simultaneously in said data signal storage circuit is at least three times a number of said first output terminals.