# US 2021/0241669 A1 · Scan driver and display device including the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0241669 A1
- Document ID: US20210241669A1
- Status: Published application
- Kind: A1
- Application number: 17/238,166
- Filed: 2021-04-22
- Published: 2021-08-05
- Earliest claimed: 2018-12-20
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Yang Hwa CHOI; Sun Kwang KIM; Sang Jin JEON
- Web page: https://patentgrep.com/patent/US20210241669A1

## CPC

- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- G09G 3/3266: Details of drivers for scan electrodes
- G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
- G09G 2310/0286: Details of a shift registers arranged for use in a driving circuit
- G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A scan driver for a display device includes scan signal output circuits connected to each other through scan lines. Each scan signal output circuit includes: a drive circuit to apply a first drive signal to a first drive node, to apply a second drive signal to a second drive node, and to apply a connection signal to a connection signal output node based on i) an input signal which is one of either a scan start signal or a scan signal applied by another scan signal output circuit, ii) a clock signal, and iii) an on-level voltage; and a buffer circuit to receive the connection signal, the first drive signal, and the second drive signal from the drive circuit, and to output one of scan signals to one of the scan lines based on the first drive signal, the second drive signal, and the clock signal.

## Claims

### Claim 1

A scan driver for a display device comprising:
first to n-th (where n is a natural number greater than or equal to 2) scan signal output circuits to apply scan signals to scan lines, respectively, the first to n-th scan signal output circuits being connected to each other through the scan lines,
wherein each of the first to n-th scan signal output circuits includes:
a drive circuit to apply a first drive signal to a first drive node, to apply a second drive signal to a second drive node, and to apply a connection signal to a connection signal output node based on i) an input signal which is one of either a scan start signal or a scan signal applied by another scan signal output circuit, ii) a clock signal, and iii) an on-level voltage; and
a buffer circuit to receive the connection signal, the first drive signal, and the second drive signal from the drive circuit, and to output one of the scan signals to one of the scan lines based on the first drive signal, the second drive signal, and the clock signal.