Patent ID: 7372439
Filing Date: 2008-05-13
Classification: G09G

Abstract:
1. A reference current generator circuit of an organic EL drive circuit for generating drive currents correspondingly to terminal pins of an organic EL panel on a basis of a reference current and current-driving said organic EL panel, comprising: a first current mirror circuit including an input side transistor, an output transistor and passive elements respectively connected in series with said input side transistor and said output side transistor, temperature coefficients of said passive elements being opposite in characteristics; and a second current mirror circuit provided as a load circuit of said first current mirror circuit, for feeding back an output current of said output side transistor to an input of said input side transistor, wherein the drive current is generated on a basis of a current corresponding to a current generated in said output side transistor as the reference current and a ratio of operating currents of said input side transistor and said output side transistor is selected such that luminance change of organic EL elements with respect to temperature change is restricted.