Pixel and organic light-emitting display device including the same

Patent metadata

Field	Value
Publication number	US-10991300-B2
Application number	US-201816134923-A
Country	US
Kind code	B2
Filing date	Sep 18, 2018
Priority date	Dec 20, 2017
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A pixel includes an organic light-emitting diode (OLED), a storage capacitor, and first to fourth transistors. The first transistor includes a gate electrode (GE), a first electrode (FE), and a second electrode (SE), and is configured to control, in response to a voltage of a first node (FN) coupled to the GE, current supplied from a first power source (PS) coupled to the FE to a second PS via the OLED. The storage capacitor is coupled between the FN and the first PS. The second transistor is coupled between a data line and the first transistor. The third transistor includes a FE coupled to the FN and a SE coupled to the SE of the first transistor. The fourth transistor includes a FE coupled to the FN and a SE coupled to the SE of the first transistor, and is configured to transmit an initialization voltage to the FN.

First claim

What is claimed is:

1. A pixel comprising:
an organic light-emitting diode;
a first transistor comprising a gate electrode, a first electrode, and a second electrode, the first transistor being configured to control, in response to a voltage of a first node coupled to the gate electrode, current supplied from a first power source coupled to the first electrode to a second power source via the organic light-emitting diode;
a storage capacitor coupled between the first node and the first power source;
a second transistor coupled between a data line and the first transistor;
a third transistor comprising a first electrode coupled to the first node and a second electrode coupled to the second electrode of the first transistor;
a fourth transistor comprising a first electrode coupled to the first node and a second electrode coupled to the second electrode of the first transistor, the fourth transistor being configured to transmit an initialization voltage to the first node;
a sixth transistor comprising a first electrode directly connected to the second electrode of the fourth transistor and a second electrode directly connected to a first electrode of the organic light-emitting diode such that the sixth transistor is coupled between the second electrode of the fourth transistor and the first electrode of the organic light-emitting diode; and
a seventh transistor comprising a first electrode coupled to the first electrode of the organic light-emitting diode and a second electrode coupled to a power source configured to supply the initialization voltage,
wherein, in an operational state of the pixel, the fourth transistor and the seventh transistor are configured to be simultaneously turned on.

2. The pixel of claim 1 , wherein, in the operational state of the pixel, the initialization voltage successively passes through the seventh transistor and the fourth transistor and then passes to the first node.

3. The pixel of claim 1 , further comprising:
a fifth transistor coupled between the first power source and the first transistor,
wherein the sixth transistor is coupled between the second electrode of the fourth transistor and the first electrode of the seventh transistor, and
wherein, in an operational state of the pixel, the fifth transistor and the sixth transistor are configured to be successively turned off.

4. The pixel of claim 1 , further comprising:
a fifth transistor coupled between the first power source and the first transistor,
wherein the sixth transistor is coupled between the second electrode of the third transistor and the second electrode of the fourth transistor,
wherein, in an operational state of the pixel, the fifth transistor and the sixth transistor are configured to be simultaneously turned off.

5. The pixel of claim 1 , further comprising:
a fifth transistor coupled between the first power source and the first transistor;
a seventh transistor coupled between the first electrode of the organic light-emitting diode and an initialization power source configured to supply the initialization voltage; and
an eighth transistor coupled between the second electrode of the first transistor and the initialization power source,
wherein the sixth transistor is coupled between the second electrode of the first transistor and the first electrode of the organic light emitting diode.

6. The pixel of claim 5 , wherein, in an operational state of the pixel, the fourth transistor and the eighth transistor are configured to be simultaneously turned on.

7. The pixel of claim 6 , wherein, in the operational state, the initialization voltage successively passes through the eighth transistor and the fourth transistor, and then passes to the first node.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Jong Hee
• Lee Ji Hye

Classifications

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G2320/0214

  with crosstalk due to leakage current of pixel switch in active matrix panels · CPC title

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title