Patent ID: 7477094

Claim:
A current driving device comprising: a first-conductive-type first MISFET in which a reference current flows in a driving state; a first-conductive-type first current distribution MISFET which constitutes a current mirror circuit together with the first MISFET and makes the reference current flow; a second-conductive-type first current input MISFET having a drain connected to the first current distribution MISFET; and a plurality of current supply sections each including second-conductive-type current source MISFETs constituting a current mirror circuit together with the first current input MISFET, switches which are connected to the current source MISFETs and turn ON or OFF a current flowing in the current source MISFETs in accordance with display data, and an output terminal which is connected to the switches and outputs a current in accordance with the display data to a display panel, the current driving device being provided on a semiconductor chip, wherein a plurality of units of the first current distribution MISFET and the first current input MISFET are provided for the semiconductor chip, and wherein a bias line connected to a gate electrode of the first MISFET and gate electrodes of the first current distribution MISFETs and shared by the gate electrodes is further provided.