| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a chip area by reducing a circuit scale of a light emitting element driving circuit having a gamma characteristic. <P>SOLUTION: The driving circuit is provided with a first current driving circuit (10) which has a plurality of current sources (M<SB>00</SB>to M<SB>0i</SB>of the figure) regulated in the value of the current outputted based on a reference current (I<SB>REF</SB>) and switching circuits (SW<SB>01</SB>to SW<SB>0i</SB>) for on/off controlling the current paths between the plurality of current sources and the current output ends based on the prescribed lower bit signal of the video signal and outputs the first output current meeting the prescribed lower bit signal of the video signal, a second current driving circuit (20) which outputs the second output current meeting the prescribed upper bit signal of the video signal, and a current source circuit (30) which variably controls the reference current (I<SB>REF</SB>) based on the upper bit signal of the video signal. The current formed by compounding the first and second output currents is outputted as the output current and the amount of the change in the output current corresponding to a change in ILSB of the video signal is varied according to the value of the video signal and the gamma characteristic is subjected to linear approximation such that the luminance over the entire part of a display panel is variably controlled based on the control signal from a panel luminance adjustment circuit (40). <P>COPYRIGHT: (C)2005,JPO&NCIPI |
