Display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-10475377-B2
Application number	US-201514928417-A
Country	US
Kind code	B2
Filing date	Oct 30, 2015
Priority date	Sep 19, 2008
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

The present invention provides a display device and a method of driving the same. The display device includes: a light-emitting device; a first capacitor connected between a first contact point and a second contact point; a driving transistor including an input terminal connected to a first voltage, an output terminal, and a control terminal connected to the second contact point; a first switching transistor controlled by a first control signal and connected between a data voltage and the first contact point; a second switching transistor controlled by a second control signal and connected between a second voltage and the first contact point; a third switching transistor controlled by a third control signal and connected between the second contact point and the second voltage; a fourth switching transistor controlled by the first control signal and connected between the second contact point and the output terminal of the driving transistor; and a fifth switching transistor controlled by the second control signal and connected between the light-emitting device and the output terminal of the driving transistor.

First claim

What is claimed is:

1. A display device, comprising:
a substrate;
a first semiconductor, a second semiconductor, a third semiconductor, a fourth semiconductor, a fifth semiconductor, and a sixth semiconductor disposed on the substrate;
a gate insulating layer disposed on the first semiconductor, the second semiconductor, the third semiconductor, the fourth semiconductor, the fifth semiconductor, and the sixth semiconductor;
a first control terminal, a second control terminal, a third control terminal, a fourth control terminal, a fifth control terminal, a sixth control terminal, and a storage electrode disposed on the gate insulating layer;
an interlayer insulating film disposed on the first control terminal, the second control terminal, the third control terminal, the fourth control terminal, the fifth control terminal, the sixth control terminal, and the storage electrode;
a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a first output terminal, a second output terminal, a third output terminal, a fourth output terminal, a fifth output terminal, a sixth output terminal, and an electrode member disposed on the interlayer insulating film, a widest portion of the electrode member overlapping the storage electrode;
a passivation layer disposed on the first input terminal, the second input terminal, the third input terminal, the fourth input terminal, the fifth input terminal, the sixth input terminal, the first output terminal, the second output terminal, the third output terminal, the fourth output terminal, the fifth output terminal, the sixth output terminal, and the electrode member;
a pixel electrode disposed on the passivation layer and connected to the fifth output terminal;
a partition disposed on the pixel electrode, the partition comprising an opening exposing a portion of the pixel electrode;
a light emitting member disposed in the opening;
a common electrode disposed on the light emitting member and the partition;
a first driving voltage line disposed on the gate insulating layer;
a second driving voltage line electrically connected to the first driving voltage line and a source region of the sixth semiconductor through the sixth input terminal; and
a capacitor connected between a first contact point and a second contact point, the capacitor including the storage electrode and the widest portion of the electrode member,
wherein:
the first output terminal and the second output terminal are connected to each other at the first contact point, and the third output terminal, the fourth input terminal, and the sixth control terminal are connected to each other at the second contact point;
the electrode member is electrically connected to the first contact point and the storage electrode is electrically connected to the second contact point;
at least one of the first control terminal and the second control terminal comprise a plurality of protruding portions;
the second input terminal and the third input terminal are directly connected to each other and are not directly connected to the sixth input terminal;
the first semiconductor, the first control terminal, the first input terminal, and the first output terminal constitute a first switching transistor;
the second semiconductor, the second control terminal, the second input terminal, and the second output terminal constitute a second switching transistor;
the third semiconductor, the third control terminal, the third input terminal, and the third output terminal constitute a third switching transistor;
the fourth semiconductor, the fourth control terminal, the fourth input terminal, and the fourth output terminal forms a fourth switching transistor;
the fifth semiconductor, the fifth control terminal, the fifth input terminal, and the fifth output terminal constitute a fifth switching transistor;
the sixth semiconductor, the sixth control terminal, the sixth input terminal, and the sixth output terminal constitute a driving transistor; and
in a first period, a second period, a third period, a fourth period, and a fifth period, the periods being sequentially formed:
the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, and the fifth switching transistor are turned off for the first period;
the first switching transistor, the third switching transistor, and the fourth switching transistor are turned on, and the second switching transistor and the fifth switching transistor are turned off for the second period;
the first switching transistor and the fourth switching transistor are turned on, and the second switching transistor, the third switching transistor, and the fifth switching transistor are turned off for the third period;
the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, and the fifth switching transistor are turned off for the fourth period; and
the second switching transistor and the fifth switching transistor are turned on, and the first switching transistor, the third switching transistor, and the fourth switching transistor are turned off for the fifth period.

2. The display device of claim 1 , wherein at least one of the third control terminal, the fourth control terminal, and the fifth control terminal comprise a plurality of protruding portions.

3. The display device of claim 1 , wherein the first control terminal and the fourth control terminal are connected to each other, and the second control terminal and the fifth control terminal are connected to each other.

4. The display device of claim 1 , wherein the fourth output terminal, the fifth input terminal, and the sixth output terminal are connected to each other.

5. The display device of claim 1 , wherein the first switching transistor, the third switching transistor, and the fourth switching transistor respectively comprise a different channel-type electric field effect transistor from the second switching transistor, the fifth switching transistor, and the driving transistor.

6. The display device of claim 5 , wherein the first switching transistor, the third switching transistor, and the fourth switching transistor are n-channel electric field effect transistors.

7. The display device of claim 6 , wherein the second switching transistor, the fifth switching transistor, and the driving transistor are p-channel electric field effect transistors.

8. The display device of claim 7 , wherein the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, and the fifth switching transistor and the driving transistor comprise polysilicon.

9. The display device of claim 1 , wherein the light emitting element does not emit light for the first period, the second period, the third period, and the fourth period, and the light emitting element emits light for the fifth period.

10. The display device of claim 9 , wherein the sum of the first period, the second period, the third period, the fourth period, and the fifth period is one frame.

11. The display device of claim 10 , wherein the fifth period is half the one frame.

12. The display device of claim 1 , wherein each of the third switching transistor and the fourth switching transistor comprise a control terminal, an output terminal, and an input terminal, and the control terminals of the third switching transistor and the fourth switching transistor respectively comprise a plurality of protruding portions.

13. The display device of claim 12 , where

Assignees

• Samsung Display Co Ltd

Inventors

• Na Hyung-Don
• Kim Young-Ii
• Woo Doo-Hyung
• Chang Young-Jin
• Eom Ji-Hye
• Chung In-Do
• Jin Seong-Hyun

Classifications

• G09G2320/0223

  Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes · CPC title

• G09G2320/0261

  in the context of movement of objects on the screen or movement of the observer relative to the screen · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2300/043

  Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver · CPC title

• G09G3/3233 Primary

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