US 6,747,417 B2 · Organic EL element drive circuit and organic EL display device

Abstract

An organic EL element drive circuit includes a current mirror circuit, a first current output circuit for generating a current having a first value in response to an output current of one of output side transistors of the current mirror circuit and a current generator circuit. An input terminal of the organic EL element drive circuit is supplied with a current having a second value from a second current output circuit of another organic EL element drive circuit preceding to the organic EL element drive circuit, which has substantially the same construction as that of the first current output circuit, to generate a predetermined drive current and the input transistor of the current mirror circuit is driven by the predetermined drive current to generate the first current value corresponding to the second current value.

Claims15

Dependent claims

An organic EL element drive circuit including a current mirror circuit having an input side transistor supplied with a predetermined drive current and a plurality of output side parallel transistors, from which drive currents to be supplied to terminal pins of an organic EL panel are derived, comprising:

a current output circuit for generating a current having a first value in response to an output current of one of said output side transistors;
and
a current generator circuit for generating said predetermined drive current in response to a current having a second value outputted by another organic EL element drive circuit preceding to said organic EL element drive circuit and having a current output circuit and a current mirror circuit substantially the same as said current output circuit and said current mirror circuit of said organic EL element drive circuit, the current having the second value being outputted from said current output circuit of said another organic EL element drive circuit.

An organic EL display device comprising:

an organic EL display panel;
a current mirror circuit having an input side transistor supplied with a predetermined drive current and a plurality of output side parallel transistors, from which drive currents to be supplied to terminal pins of an organic EL panel are derived;
a current output circuit for generating a current having a first value in response to an output current of one of said output side transistors;
and
a current generator circuit for generating said predetermined drive current in response to a current having a second value outputted by another organic EL element drive circuit preceding to said organic EL element drive circuit and having a current output circuit and a current mirror circuit substantially the same as said current output circuit and said current mirror circuit of said organic EL element drive circuit, the current having the second value being outputted from said current output circuit of said another organic EL element drive circuit.

2 more elements

Dependencies are inferred from the claim text.

Organic EL element drive circuit and organic EL display device

Life of this patent

Organic EL element drive circuit and organic EL display device

Life of this patent

Abstract

Claims15