Scan driver, display device, and method of driving display device

Patent metadata

Field	Value
Publication number	US-10586494-B2
Application number	US-201615294361-A
Country	US
Kind code	B2
Filing date	Oct 14, 2016
Priority date	Oct 23, 2015
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

The present disclosure provides a display device including a display panel and a scan driver. The display panel displays an image. The scan driver includes a scan signal generation circuit disposed on one side of the display panel, and an emission signal generation circuit disposed on the other side of the display panel. The emission signal generation circuit outputs an emission signal having at least two Logic High sections in response to an external clock signal and a first scan signal output from the scan signal generation circuit.

First claim

What is claimed is:

1. A display device comprising:
a display panel displaying an image at a display area; and
a scan driver comprising a scan signal generation circuit on a first side of the display panel and an emission signal generation circuit on a second side of the display panel, the second side being opposite to the first side in a direction along which a scan line travels,
wherein the scan signal generation circuit includes first and second shift register circuits sequentially generating first and second scan signals based on first and second clock signals, and the first shift register circuit outputs the first scan signal to the scan line on the first side, and
wherein the emission signal generation circuit outputs an emission signal having at least two Logic High sections to the display area of the display panel in response to an external clock signal and receives the first scan signal directly from the scan line travelling through the display area of the on the second side.

2. The display device of claim 1 , wherein the emission signal generation circuit comprises:
a first circuit comprising first to third transistors and a first capacitor to charge and discharge a Q node and QB node;
a second circuit comprising fourth and fifth transistors to charge and discharge the Q node and the QB node;
a third circuit comprising a pull-up transistor, a pull-down transistor, and a second capacitor to output a Logic High emission signal or a Logic Low emission signal through an output terminal of the emission signal generation circuit.

3. The display device of claim 2 , wherein the first transistor configured such that a gate electrode thereof is connected to an N-th clock signal line, a first electrode thereof is connected to a start signal line, and a second electrode thereof is connected to the Q node;
the second transistor configured such that a gate electrode thereof is connected to the start signal line, a first electrode thereof is connected to a gate low voltage line, and a second electrode thereof is connected to a Q2 node;
the first capacitor configured such that one end thereof is connected to a clock signal line and the other end thereof is connected to the Q2 node; and
a third transistor comprising a first third transistor A and a second third transistor B, wherein the first third transistor A is configured such that a gate electrode thereof is connected to the Q2 node, a first electrode thereof is connected to the N-th clock signal line, and a second electrode thereof is connected to the QB node, while the second third transistor B is configured such that a gate electrode thereof is connected to the Q node, a first electrode thereof is connected to the gate low voltage line, and a second electrode thereof is connected to the QB node.

4. The display device of claim 3 , wherein the pull-up transistor configured such that a gate electrode thereof is connected to the Q node, a first electrode thereof is connected to a gate high voltage line, and a second electrode thereof is connected to the output terminal of the emission signal generation circuit;
the pull-down transistor configured such that a gate electrode thereof is connected to the QB node, a first electrode thereof is connected to the gate low voltage line, and a
second electrode thereof is connected to the output terminal of the emission signal generation circuit; and
the second capacitor configured such that one end thereof is connected to the Q node and the other end thereof is connected to the output terminal of the emission signal generation circuit.

5. The display device of claim 4 , wherein the first circuit comprises a sixth transistor configured such that a gate electrode thereof is connected to the start signal line, a first electrode thereof is connected to the gate low voltage line, and a second electrode thereof is connected to the QB node, and
the third circuit comprises a seventh transistor configured such that a gate electrode thereof is connected to the gate high voltage line, a first electrode thereof is connected to one side of the Q node being adjacent to the second electrode of the fourth transistor, and a second electrode thereof is connected to the other side of the Q node being adjacent to one side of the second capacitor.

6. The display device of claim 4 , wherein the pull down transistor comprises a first pull-down transistor and a second pull-down transistor, wherein the first pulldown transistor is configured such that a gate electrode thereof is connected to the QB node, and a second electrode thereof is connected to the output terminal of the emission signal generation circuit, while the second pull-down transistor is configured such that a gate electrode thereof is connected to the QB node, a first electrode thereof is connected to the gate low voltage line, and a second electrode thereof is connected to a first electrode of the first pull-down transistor;
a seventh transistor configured such that a gate electrode thereof is connected to the gate high voltage line, a first electrode thereof is connected to one side of the Q node being adjacent to the second electrode of the fourth transistor, and a second electrode thereof is connected to the other side of the Q node being adjacent to one side of the second capacitor; and
an eighth transistor configured such that a gate electrode thereof is connected to the output terminal of the emission signal generation circuit, a first electrode thereof is connected to the gate high voltage line, and a second electrode thereof is connected to a node between the first electrode of the first pull-down transistor and the second electrode of the second pull-down transistor.

7. The display device of claim 4 , wherein the pull-down transistor configured to comprise a first pull-down transistor and a second pull-down transistor, wherein the first pull-down transistor is configured such that a gate electrode thereof is connected to the QB node and a second electrode thereof is connected to the output terminal of the emission signal generation circuit, while the second pull-down transistor is configured such that a gate electrode thereof is connected to the QB node, a first electrode thereof is connected to the gate low voltage line, and a second electrode thereof is connected to a first electrode of the first pulldown transistor; and
an eighth transistor configured such that a gate electrode thereof is connected to the output terminal of the emission signal generation circuit, a first electrode thereof is connected to the gate high voltage line, and a second electrode thereof is connected to a node between the first electrode of the first pull-down transistor and the second electrode of the second pull-down transistor.

8. The display device of claim 5 , wherein the fourth transistor configured such that a gate electrode thereof is connected to an output terminal of an N-th shift
register circuit of the scan signal generation circuit, a first electrode thereof is connected to a reset signal line, and a second electrode thereof is connected to the Q node; and
a fifth transistor configured such that a gate electrode thereof is connected to the output terminal of the N-th shift register of the scan signal generation circuit, a first electrode thereof
is connected to the N-th clock signal line, and a second electrode thereof is connected to the QB node.

9. The display device of claim 5 , wherein the second circuit comprises:
a first fourth transistor A configured such that a gate electrode thereof is connected to an output terminal of an N-th shift register of the scan signal generation circuit, and a first electrode thereof is connected to the gate high voltage line;
a second fourth transistor B co

Assignees

• Lg Display Co Ltd

Inventors

• Bong Junho
• Kang Changheon
• Lee Jungmin

Classifications

• G11C19/186

  using only one transistor per capacitor, e.g. bucket brigade shift register · CPC title

• G09G3/3233

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

• G11C19/28

  using semiconductor elements (G11C19/14, G11C19/36 take precedence) · 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

• 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