US 2006/0139256 A1 · Method and apparatus for driving light-emitting display panel

Abstract

A passive matrix light-emitting display panel including, at cross points of a plurality of scan lines and a plurality of data lines which cross each other, light-emitting elements having anode terminals connected to the scan lines and cathode terminals connected to the data lines, respectively, is used. The display panel includes switching units on a scanning drive side to set the scan lines to a scanning selection voltage or a non-scanning selection voltage (ground voltage) and switching units on a data drive side to connect the data lines to ON-drive voltage sources or OFF-drive voltage sources. The ON-drive voltage sources are constituted by sink-type constant current sources which sink ON-drive currents of a light-emitting element in a scanning state from a cathode terminal side of the light-emitting element toward a reference voltage point through the data driver switching units.

Claims16

Dependent claims

A drive device for a passive matrix light-emitting display panel having a plurality of scan lines and a plurality of data lines which cross each other, and light-emitting elements having such diode characteristics that anode terminals and cathode terminals of the light-emitting elements are connected to the scan lines and the data lines, respectively, comprising:

scanning driver switching means for setting the scan lines to a scanning selection voltage or a non-scanning selection voltage;
and data driver switching means for connecting the data lines to an ON-drive voltage source or an OFF-drive voltage source, wherein
the ON-drive voltage source is constituted by a sink type constant current source which sinks an ON-drive current of a light-emitting element in a scanning state from the cathode terminal side of the light-emitting element toward a reference voltage point through the data driver switching means.

A drive method for a passive matrix light-emitting display panel having a plurality of scan lines and a plurality of data lines which cross each other, and light-emitting elements having such diode characteristics that anode terminals and cathode terminals of the light-emitting elements are connected to the scan lines and the data lines, respectively, wherein

at least a reset period and an ON period of the light-emitting element in one-scanning period of the light-emitting display panel,
in the reset period of the light-emitting element, an operation which supplies a scanning selection voltage to a scan line to be scanned, supplies a non-scanning selection voltage to a scan line not to be scanned, and connects all the data lines to an OFF-drive voltage source is executed,
in the ON period of the light-emitting element, an operation which supplies a scanning selection voltage to the scan line to be scanned, supplies a non-scanning selection voltage to the scan line not to be scanned, connects a data line to which the light emitting element to be turned on is connected to an ON-drive voltage source, and connects a data line to which the light-emitting element to be turned on is not connected to an OFF-drive voltage source is executed, and
the ON-drive voltage source executes a current sink operation which sinks the ON-drive current of the light-emitting element from a cathode terminal side of the light-emitting element in a scanning state toward a reference voltage point.

1 more element

Dependencies are inferred from the claim text.

Method and apparatus for driving light-emitting display panel

Life of this patent

Method and apparatus for driving light-emitting display panel

Life of this patent

Abstract

Claims16