Gate driver having normal stages and dummy stages and display device having the same

Patent metadata

Field	Value
Publication number	US-10347189-B2
Application number	US-201815985593-A
Country	US
Kind code	B2
Filing date	May 21, 2018
Priority date	Oct 22, 2015
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A display device includes a display panel having a curved side or a polygonal side, the display panel including a plurality of pixels in a display region, a gate driver including a plurality of normal stages connected to each other for outputting gate signals to the pixels via a plurality of gate lines, and a plurality of dummy stages between some of the normal stages, and a data driver providing data signals to the pixels via a plurality of data lines.

First claim

What is claimed is:

1. A display device comprising:
a display panel having a non-rectangular-shape, and comprising a plurality of pixels in a display region;
a gate driver comprising:
a plurality of normal stages connected to each other, and configured to output gate signals to the pixels via a plurality of gate lines; and
a plurality of dummy stages between some of the normal stages; and

a data driver configured to provide data signals to the pixels via a plurality of data lines,
wherein each of the normal stages and the dummy stages comprises:
an input terminal;
a first clock terminal;
a second clock terminal; and

wherein the input terminal, the first clock terminal and the second clock terminal of a same dummy stage of the plurality of dummy stages receive the same signal.

2. The display device of claim 1 , wherein the first clock terminal and the second clock terminal of the same dummy stage are directly electrically connected with each other.

3. The display device of claim 2 , wherein each of the normal stages and the dummy stages further comprises:
a first power terminal configured to receive a first gate voltage; and
a second power terminal configured to receive a second gate voltage.

4. The display device of claim 3 , wherein the input terminal, the first clock terminal and the second clock terminal of the same dummy stage of the plurality of dummy stages receives the first gate voltage.

5. The display device of claim 3 , wherein the dummy stage includes: a first input transistor connected between the input terminal and a first node and having a gate electrode connected to the second clock terminal;
a first stabilizing transistor connected between the first power terminal and a second stabilizing transistor and having a gate electrode connected to a third node;
the second stabilizing transistor connected between the first stabilizing transistor and the first node and having a gate electrode connected to the first node;
a second input transistor connected between the third node and the second clock terminal and having a gate electrode connected to the first node;
a holding transistor connected between the third node and a second power terminal and having a gate electrode connected to the second clock terminal;
a first output transistor connected between the first clock terminal and an output terminal and having a gate electrode connected to a second node;
a second output transistor connected between the first power terminal and the output terminal and having a gate electrode connected to the third node;
a first capacitor connected between the first power terminal and the third node;
a second capacitor connected between the second node and the output terminal; and
a node control transistor connected between the first node and the second node and having a gate node connected to the second power terminal.

6. The display device of claim 1 , wherein the normal stages and the dummy stages are arranged in a curved line corresponding to a shape of a curved side or a polygonal side,
wherein the pixels are arranged in a first direction along which the gate lines extend, and in a second direction along which the data lines extend,
wherein a number of the dummy stages between two adjacent normal stages decreases as a first angle between the first direction and the curved side or the polygonal side of the display panel increases, and
wherein the number of the dummy stages between two adjacent normal stages is greater than one when the first angle is smaller than a second angle between the firs direction and the second direction.

7. The display device of claim 1 , wherein each of the normal stages and the dummy stages further comprises an output terminal.

8. The display device of claim 7 , wherein the output terminal of each of the dummy stages is in a floating state.

9. A display device comprising:
a display panel having a non-rectangular-shape, and comprising a plurality of pixels in a display region;
a gate driver comprising:
a plurality of normal stages connected to each other, and configured to output gate signals to the pixels via a plurality of gate lines; and
a plurality of dummy stages between some of the normal stages; and

a data driver configured to provide data signals to the pixels via a plurality of data lines,
wherein each of the normal stages and the dummy stages comprises:
an input terminal;
a first clock terminal;
a second clock terminal; and

wherein the first clock terminal and the second clock terminal of a same dummy stage of the plurality of dummy stages receive the same signal.

10. The display device of claim 9 , wherein each of the normal stages and the dummy stages further comprises:
a first power terminal configured to receive a first gate voltage; and
a second power terminal configured to receive a second gate voltage.

11. The display device of claim 10 , wherein the same signal is the first gate voltage.

12. The display device of claim 10 , wherein at least one of the input terminal, the first clock terminal and the second clock terminal receives the first gate voltage.

13. The display device of claim 10 , wherein at least one of the input terminal, the first clock terminal and the second clock terminal receives the second gate voltage.

14. The display device of claim 10 , wherein the dummy stage includes: a first input transistor connected between the input terminal and a first node and having a gate electrode connected to the second clock terminal;
a first stabilizing transistor connected between the first power terminal and a second stabilizing transistor and having a gate electrode connected to a third node;
the second stabilizing transistor connected between the first stabilizing transistor and the first node and having a gate electrode connected to the first node;
a second input transistor connected between the third node and the second clock terminal and having a gate electrode connected to the first node;
a holding transistor connected between the third node and a second power terminal and having a gate electrode connected to the second clock terminal;
a first output transistor connected between the first clock terminal and an output terminal and having a gate electrode connected to a second node;
a second output transistor connected between the first power terminal and the output terminal and having a gate electrode connected to the third node;
a first capacitor connected between the first power terminal and the third node;
a second capacitor connected between the second node and the output terminal; and
a node control transistor connected between the first node and the second node and having a gate node connected to the second power terminal.

15. The display device of claim 9 , wherein the normal stages and the dummy stages are arranged in a curved line corresponding to a shape of a curved side or a polygonal side,
wherein the pixels are arranged in a first direction along which the gate lines extend, and in a second direction along which the data lines extend,
wherein a number of the dummy stages between two adjacent normal stages decreases as a first angle between the first direction and the curved side or the polygonal side of the display panel increases, and
wherein the number of the dummy stages between two adjacent normal stages is greater than one when the first angle is smaller than a second angle between the firs direction and the second direction.

16. The display device of claim 9 , wherein each of the normal stages and the dummy stages further comprises an output terminal.

Assignees

• Samsung Display Co Ltd

Inventors

• Bae Jung-Bae
• Lee So-Young
• Lee Won-Se

Classifications

• G09G2330/08

  Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared · CPC title

• G09G2300/0413

  Details of dummy pixels or dummy lines in flat panels · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G3/2085

  Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination · CPC title

• G09G2320/02

  Improving the quality of display appearance · CPC title