US 2002/0163514 A1 · Drive circuit of display and display

Abstract

A driving circuit in a display apparatus includes a current driving unit for supplying a driving current in a forward direction to a light emitting element based on control data. The current driving unit is furnished with a function of supplying a predetermined current in a reverse direction to the light emitting element. The driving circuit further includes a voltage comparing unit for judging whether a reverse voltage necessary to supply the predetermined current in the reverse direction is smaller than a predetermined voltage. The driving circuit notifies an abnormal condition of the light emitting element based on a judgment by the voltage comparing unit. Consequently, it is possible to detect a light emitting element generating a leak current in a reverse direction of the light emitting element even when the light emitting element is connected to the driving circuit.

Claims12

Dependent claims

A driving circuit of a display apparatus including a current driving unit for supplying a driving current in a forward direction to a light emitting element based on control data, said driving circuit being characterized in that:

said current driving unit is furnished with a function of supplying a predetermined current in a reverse direction to said light emitting element;
said driving circuit further includes a voltage comparing unit for comparing a reverse bias voltage generated when said predetermined current in the reverse direction is supplied to said light emitting element with a predetermined voltage;
and
said driving circuit detects an abnormal condition of said light emitting element based on a comparison by said voltage comparing unit.

1 more element

A display apparatus, including:

a plurality of light emitting elements;
a common line to which said light emitting elements are connected;
and
a driving circuit provided with a current driving unit for supplying a driving current in a forward direction to said light emitting elements through a plurality of current supply lines based on control data,
said display apparatus being characterized in that:
said current driving unit is further furnished with a function of supplying a predetermined current in a reverse direction to said light emitting elements;
said driving circuit is further provided with a voltage comparing unit for comparing a reverse bias voltage generated when said predetermined current in the reverse direction is supplied to said light emitting elements with a predetermined voltage;
and
said driving circuit detects which of said light emitting elements connected to said current supply lines has an abnormal condition based on a comparison by said voltage comparing unit.

6 more elements

Dependencies are inferred from the claim text.

Drive circuit of display and display

Life of this patent

Drive circuit of display and display

Life of this patent

Abstract

Claims12