US 2003/0197473 A1 · Organic EL element drive circuit and organic EL display device

Abstract

A current mirror circuit of a current output circuit for current-driving an organic EL display panel is constructed with a plurality (n) of unit circuits each including a first MOS transistor of a certain channel type and a second MOS transistor of the same channel type having a source connected to a drain of the first MOS transistor, where n is an integer equal to or larger than 3, in which gates of the first MOS transistors or the second MOS transistors of at least two of the plurality of the unit circuits are connected to each other to form a common gate, one of the at least two unit circuits constitutes an input side circuit of the current mirror circuit, the other unit circuit constitutes an output side of the current mirror circuit and the common gate and a terminal of the input side circuit on a current drive side are connected to each other through either the first MOS transistor or the second MOS transistor of at least one of the remaining unit circuits.

Claims12

Dependent claims

An organic EL element drive circuit for current-driving any one of organic EL elements of an organic EL display panel by an output current supplied from a current output circuit constructed with a current-mirror circuit through a corresponding terminal pin of said organic EL display panel, comprising:

a plurality (n) of unit circuits each including a first MOS transistor of a certain channel type and a second MOS transistor of the same channel type and having a source connected to a drain of said first MOS transistor, where n is an integer equal to or larger than 3,
gates of either said first MOS transistors or said second MOS transistors of at least two of said n unit circuits being connected to each other to form a common gate,
one of said at least two unit circuits constituting an input side circuit of said current mirror circuit,
the other of said at least two unit circuit constituting an output side of said current mirror circuit,
said common gate being connected to a current drive side terminal of said input side circuit through one of said first MOS transistor and said second MOS transistor of at least one of the remaining unit circuits.

2 more elements

An organic EL display device comprising an organic EL element drive circuit for current-driving any one of organic EL elements of an organic EL display panel by an output current supplied from a current output circuit constructed with a current-mirror circuit through a corresponding terminal pin of said organic EL display panel, said organic EL element drive circuit comprising:

a plurality (n) of unit circuits each including a first MOS transistor of a certain channel type and a second MOS transistor of the same channel type and having a source connected to a drain of said first MOS transistor, where n is an integer equal to or larger than 3,
gates of ones of said first MOS transistors and said second MOS transistors of at least two of said n unit circuits being connected to each other to form a common gate,
one of said at least two unit circuits constituting an input side circuit of said current mirror circuit,
the other of said at least two unit circuit constituting an output side of said current mirror circuit,
said common gate being connected to a current drive side terminal of said input side circuit through one of said first MOS transistor and said second MOS transistor of at least one of the remaining unit circuits,
an output drive current for said terminal pin being generated by turning said one MOS transistor of said one remaining unit circuit and said the other MOS transistor of said output side circuit ON.

3 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

Claims12