Patent attributes
After a command signal corresponding to a gradation whose light emission is controlled is outputted from a controller IC 4, based on this, a combination of respectively different intensity conversion data are extracted from a linear data table 11 and a γ correction data table 12. The respective intensity conversion data are analog converted by a first DAC 13 and a second DAC 14, and these are converted into a voltage level of a mean value by resistors R1, R2 and an addition circuit 15. By this voltage level of the mean value, an absorption current in a current mirror circuit 16 is controlled, and as a result, a drive current accompanied by γ correction for the light emitting elements can be obtained by the current mirror circuit 16. The first DAC 13 and the second DAC 14 handle relatively simple intensity conversion data obtained from the linear data table 11 and the γ correction data table 12 and analog convert such data. Therefore, a light emission control circuit accompanied by γ correction can be realized without enlarging the circuit scale.
