US 2026/0018115 A1Published application

Pixel circuit and driving method thereof

AssigneeAUO Corporation

InventorsLung-Ling TANG, Tzu-Chiang LIAO

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Abstract

A pixel circuit includes a driving transistor, an emission control transistor, a first light-emitting element and a second light-emitting element. The emission control transistor is between a first terminal of the driving transistor and a first system voltage terminal. The first light-emitting element is between a second terminal of the driving transistor and a second system voltage terminal. The second light-emitting element is between the second terminal of the driving transistor and a third system voltage terminal. The first light-emitting element is controlled by an emission control signal of a gate terminal of the emission control transistor and a voltage level of the second system voltage terminal. The second light-emitting element is controlled by the emission control signal and a voltage level of the third system voltage terminal. When the first or second light-emitting element emits light, the second and third system voltage terminals have different voltage levels.

Claims15

Dependent claims

A pixel circuit, comprising:

a driving transistor having a gate terminal for receiving a data signal;
an emission control transistor coupled between a first terminal of the driving transistor and a first system voltage terminal;
a first light-emitting element coupled between a second terminal of the driving transistor and a second system voltage terminal to emit light with a first color;
and
a second light-emitting element coupled between the second terminal of the driving transistor and a third system voltage terminal to emit light with a second color different from the first color;
wherein a gate terminal of the emission control transistor receives an emission control signal;
wherein the first light-emitting element is controlled according to the emission control signal and a voltage level of the second system voltage terminal, wherein the second light-emitting element is controlled according to the emission control signal and a voltage level of the third system voltage terminal;
wherein when the first light-emitting element or the second light-emitting element emits light, the voltage level of the second system voltage terminal is different from the voltage level of the third system voltage terminal;
wherein the first system voltage terminal receives a system low voltage, wherein an anode of the first light-emitting element is coupled to the second system voltage terminal and a cathode of the first light-emitting element is coupled to the second terminal of the driving transistor, wherein an anode of the second light-emitting element is coupled to the third system voltage terminal and a cathode of the second light-emitting element is coupled to the second terminal of the driving transistor;
wherein when the first light-emitting element emits light and the second light-emitting element does not emit light, the second system voltage terminal has a high voltage level and the third system voltage terminal has a low voltage level;
and
wherein when the first light-emitting element does not emit light and the second light-emitting element emits light, the second system voltage terminal has the low voltage level and the third system voltage terminal has the high voltage level.

9 more elements

A driving method of a pixel circuit, wherein the pixel circuit comprises a driving transistor, an emission control transistor, a first light-emitting element and a second light-emitting element, wherein the driving method comprises:

providing a data signal to a gate terminal of the driving transistor;
providing an emission control signal to a gate terminal of the emission control transistor, wherein the emission control transistor is coupled between a first terminal of the driving transistor and a first system voltage terminal, wherein the first light-emitting element is coupled between a second terminal of the driving transistor and a second system voltage terminal to emit light with a first color, wherein the second light-emitting element is coupled between the second
terminal of the driving transistor and a third system voltage terminal to emit light with a second color different from the first color;
and
controlling the emission control signal and voltage levels of the second system voltage terminal and the third system voltage terminal, thereby causing the first light-emitting element or the second light-emitting element to emit light;
wherein when the first light-emitting element or the second light-emitting element emits light, the voltage levels of the second system voltage terminal and the third system voltage terminal are different, wherein the driving method further comprises:
providing a high voltage level to the second system voltage terminal coupled to an anode of the first light-emitting element and providing a low voltage level to the third system voltage terminal coupled to an anode of the second light-emitting element, thereby causing the first light-emitting element to emit light and causing the second light-emitting element not to emit light;
and
providing the low voltage level to the second system voltage terminal and providing the high voltage level to the third system voltage terminal, thereby causing the first light-emitting element not to emit light and causing the second light-emitting element to emit light.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/335,867Filed 22 Sep 2025
Priority: TW 1131128303 Apr 2024
Published: 15 Jan 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G09G 3/32
Using electroluminescent panels: semiconductive, e.g. using light-emitting diodes [LED]
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 2310/08
Command of the display device: details of timing specific for flat panels, other than clock recovery

Family

Application18/908,341Continuation · filed 7 Oct 2024
Application19/335,867Continuation
US 12,518,688 B2Related patent
US 12,725,570 B2Related patent
US 2025/0316211 A1Published application
US 2026/0018115 A1This patent

From the US filing history. Foreign family members aren’t listed.

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