Organic light-emitting display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-2018102498-A1
Application number	US-201715649498-A
Country	US
Kind code	A1
Filing date	Jul 13, 2017
Priority date	Oct 12, 2016
Publication date	Apr 12, 2018
Grant date	—

Abstract

An organic light-emitting display device is provided. The organic light-emitting display device comprises a substrate, a thin-film transistor (TFT) disposed on the substrate, an overcoat layer disposed on the TFT, a first electrode disposed on the overcoat layer and including a lower electrode layer, an intermediate electrode layer, which is disposed on the lower electrode layer, and an upper electrode layer, which is disposed on the intermediate electrode layer, an emission layer disposed on the first electrode, and a second electrode disposed on the emission layer, wherein the first electrode includes a first area in which the lower electrode layer, the intermediate electrode layer and the upper electrode layer are sequentially stacked and a second area in which the lower electrode layer and the upper electrode layer are sequentially stacked.

First claim

What is claimed is:

1 . An organic light-emitting display device, comprising:
a substrate; a thin-film transistor (TFT) disposed on the substrate; an overcoat layer disposed on the TFT; a first electrode disposed on the overcoat layer and including a lower electrode layer, an intermediate electrode layer which is disposed on the lower electrode layer, and an upper electrode layer which is disposed on the intermediate electrode layer; an emission layer disposed on the first electrode; and a second electrode disposed on the emission layer, wherein the first electrode includes a first area in which the lower electrode layer, the intermediate electrode layer and the upper electrode layer are sequentially stacked and a second area in which the lower electrode layer and the upper electrode layer are sequentially stacked, wherein the lower electrode layer is in direct contact with the upper electrode layer in the second area.

2 . The organic light-emitting display device of claim 1 , wherein the intermediate electrode layer has a higher reflectivity than the lower and upper electrode layers.

3 . The organic light-emitting display device of claim 2 , wherein
the lower and upper electrode layers are transparent electrodes, and the intermediate electrode layer is a reflective electrode.

4 . The organic light-emitting display device of claim 1 , wherein the first area is disposed to overlap with the emission layer.

5 . The organic light-emitting display device of claim 1 , wherein the overcoat layer further comprising a contact hole disposed to overlap with the first electrode,
wherein the TFT and the first electrode are electrically connected through the contact hole, and wherein the contact hole is disposed in the second area.

6 . The organic light-emitting display device of claim 1 , wherein the second area is disposed to surround the first area.

7 . The organic light-emitting display device of claim 6 , wherein the upper electrode layer is disposed to overlap with the intermediate electrode layer.

8 . The organic light-emitting display device of claim 1 , wherein the second area is provided as multiple patterns disposed along the edges of the first area and spaced apart from one another.

9 . The organic light-emitting display device of claim 1 , wherein the intermediate electrode layer is formed of aluminum (Al), silver (Ag), gold (Au), platinum (Pt), chromium (Cr), or an alloy thereof.

10 . The organic light-emitting display device of claim 1 , further comprising:
a pixel defining layer disposed between the first and second electrodes, wherein the emission layer is disposed in an opening of the pixel defining layer.

11 . The organic light-emitting display device of claim 9 , wherein the first area is disposed to overlap with the opening.

12 . The organic light-emitting display device of claim 12 , wherein the second area is not disposed to overlap with the opening.

13 . An organic light-emitting display device, comprising:
a plurality of pixels receiving a gate signal, a data signal, an initialization control signal, a stress control signal, a first power supply voltage, a second power supply voltage, an initialization voltage and a stress voltage, wherein each of the plurality of pixels includes: a first transistor including a first terminal configured to receive the first power supply voltage and generate a driving current; a second transistor including a first terminal configured to receive the data signal, a second terminal electrically connected to a control terminal of the first transistor, and a control terminal receiving the gate signal; a storage capacitor including a first terminal configured to receive the first power supply voltage and a second terminal electrically connected to the control terminal of the first transistor; an organic light-emitting diode (OLED) including a first terminal electrically connected to the second terminal of the first transistor and a second terminal configured to receive the second power supply voltage and emit light based on the driving current; an initialization transistor including a first terminal configured to receive the initialization voltage, a second terminal electrically connected to the first terminal of the OLED, and a control terminal configured to receive the initialization control signal; and an overloading transistor including a first terminal configured to receive the stress voltage, a second terminal electrically connected to the first terminal of the OLED, and a control terminal configured to receive the stress control signal.

14 . The organic light-emitting display device of claim 13 , wherein the initialization control signal is a same signal as the stress control signal.

15 . The organic light-emitting display device of claim 14 , wherein the initialization voltage and the stress voltage are simultaneously provided to the first terminal of the OLED.

16 . The organic light-emitting display device of claim 13 , wherein the first and second transistors are turned off during a period when the initialization transistor and the overloading transistor are turned on.

17 . The organic light-emitting display device of claim 13 , wherein the initialization voltage and the stress voltage have different levels.

18 . The organic light-emitting display device of claim 17 , wherein the stress voltage is higher than the initialization voltage.

19 . The organic light-emitting display device of claim 13 , wherein the stress control signal is an initialization control signal of a previous stage.

20 . The organic light-emitting display device of claim 13 , wherein the initialization voltage is provided to the first terminal of the overloading transistor after the application of the initialization voltage and the stress voltage to the first terminal of the OLED.

Assignees

• Samsung Display Co Ltd

Inventors

• Shin Jae Min
• Kim Woong Sik
• Park Won Sang
• Kang Seung Bae
• Kim Min Woo
• Hong Jong Ho

Classifications

• 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

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2300/0842

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

• G09G2310/0251

  Precharge or discharge of pixel before applying new pixel voltage · CPC title