| 摘要 |
<P>PROBLEM TO BE SOLVED: To make a circuit scale smaller in a current generating circuit that has a plurality of current transistors for generating a plurality of unit currents and generates gradation currents corresponding to the gradations of display data. <P>SOLUTION: In the case of, for example, 8-bit data, eight bias potentials VN1 to VN8 of different potential levels are outputted from the output terminals of a bias generating circuit 10. Gate electrodes of eight fixed current transistors Q10 to Q17 set to the identical channel widths (W) and the identical channel length (L) are connected to the output terminals of the bias generating circuit 10. Unit currents corresponding to the bits of the data are caused to flow in the corresponding fixed current transistors Q10 to Q17. These current transistors Q10 to Q17 are selectively operated, and a gradation current produced by selecting each unit current is supplied to a display 5. <P>COPYRIGHT: (C)2010,JPO&INPIT |
