US 2004/0165003 A1Published application

Display apparatus and driving method for display apparatus

AssigneeCasio Computer Co., Ltd.

InventorTomoyuki Shirasaki

Life of this patent

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Abstract

A display apparatus includes light-emitting elements each of which is arranged for a pixel circuit and emits light at a luminance corresponding to a driving current. To a signal line through the pixel circuit, is supplied a gray level designation current having a current value larger than that of the driving current during a selection period to store a luminance gray level in the pixel circuit. A first voltage is outputted to the pixel circuit so that the gray level designation current is supplied to the signal line through the pixel circuit during the selection period, and a second voltage is outputted to the pixel circuit during a nonselection period, thereby modulating a current output from the pixel circuit on the basis of the luminance gray level stored in the pixel circuit to supply the driving current to the pixel circuit.

Claims16

Dependent claims

A display apparatus comprising:

a plurality of pixel circuits;
a plurality of light-emitting elements each of which is arranged for a corresponding one of the pixel circuits and emits light at a luminance corresponding to a driving current;
luminance gray level designation means for supplying, to a signal line through the pixel circuit, a gray level designation current having a current value larger than that of the driving current during a selection period to store a luminance gray level of the light-emitting element in the pixel circuit;
and
current value switching voltage output means for outputting a first voltage to the pixel circuit to cause the luminance gray level designation means to supply the gray level designation current to the signal line through the pixel circuit during the selection period, and outputting a second voltage having a potential different from that of the first voltage to the pixel circuit during a nonselection period, thereby modulating a current output from the pixel circuit on the basis of the luminance gray level stored in the pixel circuit to supply the driving current to the pixel circuit.

2 more elements

A driving method for a display apparatus which comprises a plurality of pixel circuits and causes light-emitting elements each of which is arranged for a corresponding one of the pixel circuits to emit light in accordance with a predetermined driving current to execute display, comprising:

outputting a first voltage to the pixel circuit to supply a gray level designation current having a current value larger than that of the driving current to a signal line through the pixel circuit during a selection period and store, in the pixel circuit, a luminance gray level of the light-emitting element corresponding to the current value of the gray level designation current;
and
outputting a second voltage having a potential different from that of the first voltage to the pixel circuit during a nonselection period to modulate the driving current output from the pixel circuit on the basis of the luminance gray level stored in the pixel circuit.

Dependencies are inferred from the claim text.

Facts

Application: 10/782,071Filed 18 Feb 2004
Priority: JP 2003-04719025 Feb 2003
Published: 26 Aug 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G09G 3/3233
Using an active matrix: with pixel circuitry controlling the current through the light-emitting element
G09G 2300/0465
Pixel structures: improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum…
G09G 2300/0842
Several active elements per pixel in active matrix panels: forming a memory circuit, e.g. a dynamic memory with one capacitor
G09G 2300/0866
With additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes:…