Organic light emitting display device and electronic device having the same

Patent metadata

Field	Value
Publication number	US-10176756-B2
Application number	US-201715624027-A
Country	US
Kind code	B2
Filing date	Jun 15, 2017
Priority date	Aug 9, 2016
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

An organic light emitting display device includes a display panel including pixels that includes an organic light emitting diode that emits light based on a driving current, a data driver providing a data signal to the pixels through a data line, a scan driver providing a scan signal to the pixels through a scan line, an emission control driver providing an emission control signal to the pixels through an emission control line, a first power provider providing a first high power voltage to the pixels through a first power providing line and a second power provider providing a second high power voltage to the pixels through a second power providing line and coupled to the first power provider. The second power provider includes a static current circuit that maintains the driving current having uniform value when the display panel is operated in a low frequency driving mode.

First claim

What is claimed is:

1. An organic light emitting display device comprising:
a display panel including a plurality of pixels which includes an organic light emitting diode which emits light based on a driving current;
a data driver which provides a data signal to a pixel of the plurality of pixels through a data line;
a scan driver which provides a scan signal to the pixel through a scan line;
an emission control driver which provides an emission control signal to the pixel through an emission control line;
a first power provider which provides a first high power voltage to the pixel through a first power providing line; and
a second power provider which provides a second high power voltage to the pixel through a second power providing line separate from the first power providing line, is coupled to the first power provider, and includes a static current circuit which maintains the driving current having uniform value when the display panel is operated in a low frequency driving mode.

2. The organic light emitting display device of claim 1 , wherein the second power provider includes:
a sensing block which detects the driving current flowing through the second power providing line; and
a voltage compensator which compensates a voltage level of the first high power voltage based on the driving current and output as the second high power voltage.

3. The organic light emitting display device of claim 2 , wherein the voltage compensator increases the voltage level of the first high power voltage when the driving current detected in the sensing block decreases.

4. The organic light emitting display device of claim 1 , wherein the second power provider further includes a switch block which outputs the first high power voltage when the display panel is operated in a normal driving mode and outputs the second high power voltage when the display panel is operated in the low frequency driving mode.

5. The organic light emitting display device of claim 4 , wherein the switch block includes:
a first switch which determines whether to couple the first power provider and the pixel; and
a second switch which determines whether to couple the first power provider and the static current circuit.

6. The organic light emitting display device of claim 1 , wherein each of the plurality of pixels includes:
the organic light emitting diode; and
a driving circuit which generates the driving current flowing through the organic light emitting diode and is coupled to the first power providing line and the second power providing line.

7. The organic light emitting display device of claim 6 , wherein the driving circuit includes:
a first scan transistor and a second scan transistor which transfer the data signal provided through the data line in response to the scan signal;
a driving transistor which generates the driving current in response to the data signal;
a capacitor which stores the data signal, the capacitor being coupled between the first power providing line and a gate electrode of the driving transistor;
a first emission control transistor coupled between the second power providing line and the driving transistor; and
a second emission control transistor coupled between the driving transistor and the organic light emitting diode.

8. The organic light emitting display device of claim 7 , wherein the driving circuit further includes:
a first initialization transistor which initializes the gate electrode of the driving transistor; and
a second initialization transistor which initializes an anode electrode of the organic light emitting diode.

9. The organic light emitting display device of claim 1 , wherein the static current circuit compensates a voltage level of the first high power voltage when the data signal is input.

10. The organic light emitting display device of claim 1 , wherein the second power provider is coupled to the first power provider or is located in the first power provider.

11. An electronic device includes an organic light emitting display device and a processor which controls the organic light emitting display device, the organic light emitting display device comprising:
a display panel including a plurality of pixels which includes an organic light emitting diode which emits light in response to a driving current;
a data driver which provides a data signal to a pixel of the plurality of pixels through a data line;
a scan driver which provides a scan signal to the pixel through a scan line;
an emission control driver which provides an emission control signal to the pixel through an emission control line;
a first power provider which provides a first high power voltage to the pixel through a first power providing line; and
a second power provider which provides a second high power voltage to the pixel through a second power providing line separate from the first power providing line, the second power provider being coupled to the first power provider,
wherein the second power provider includes a static current circuit which maintains the driving current having uniform value when the display panel is operated in a low frequency driving mode.

12. The electronic device of claim 11 , wherein the second power provider includes:
a sensing block which detects the driving current flowing through the second power providing line; and
a voltage compensator which compensates a voltage level of the first high power voltage based on the driving current and output as the second high power voltage.

13. The electronic device of claim 12 , wherein the voltage compensator increases the voltage level of the first high power voltage when the driving current detected in the sensing block decreases.

14. The electronic device of claim 11 , wherein the second power provider may further include a switch block which outputs the first high power voltage when the display panel is operated in a normal driving mode and outputs the second high power voltage when the display panel is operated in the low frequency driving mode.

15. The electronic device of claim 14 , wherein the switch block includes:
a first switch which determines whether to couple the first power provider and the pixel; and
a second switch which determines whether to couple the first power provider and the static current circuit.

16. The electronic device of claim 11 , wherein each of the plurality of pixels includes:
the organic light emitting diode; and
a driving circuit which generates the driving current flowing through the organic light emitting diode and is coupled to the first power providing line and the second power providing line.

17. The electronic device of claim 16 , wherein the driving circuit includes:
a first scan transistor and a second scan transistor which transfer the data signal provided through the data line in response to the scan signal;
a driving transistor which generates the driving current in response to the data signal;
a capacitor which stores the data signal, the capacitor being coupled between the first power providing line and a gate electrode of the driving transistor;
a first emission control transistor coupled between the second power providing line and the driving transistor; and
a second emission control transistor coupled between the driving transistor and the organic light emitting diode.

18. The electronic device of claim 17 , wherein the driving circuit further includes:
a first initialization transistor which initializes the gate electrode of the driving transistor; and
a second initialization transistor which initializes

Assignees

• Samsung Display Co Ltd

Inventors

• Hwang Kyung-Ho
• Shin Won-Ju
• Lee Dong-Hwan
• Jeon Jin-Young

Classifications

• 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

• G09G2320/0247

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

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G3/2092

  Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165) · CPC title