# US 9,437,166 B2 · Bi-directional driving scan driver

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- Number: US 9,437,166 B2
- Document ID: US9437166B2
- Status: Granted
- Kind: B2
- Application number: 14/451,802
- Filed: 2014-08-05
- Published: 2014-11-20
- Granted: 2016-09-06
- Earliest claimed: 2011-08-08
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jun-Yong Song; Jae Hoon Lee
- Web page: https://patentgrep.com/patent/US9437166B2

## CPC

- G09G 5/18: Timing circuits for raster scan displays (specially adapted for television H04N {; synchronisation between the display unit and other display units, videodisc player G09G5/12})
- 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 2300/0408: Integration of the drivers onto the display substrate
- G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
- G09G 2310/0283: Arrangement of drivers for different directions of scanning
- G09G 2310/0286: Details of a shift registers 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 includes stages dependently connected to each other, where each of the stages outputs a gate signal, where a first scanning start signal is input to a first stage of the stages, where a second scanning start signal is input to a last stage of the stages, where each of the first scanning start signal and the second scanning start signal has one pulse per frame, where the stages sequentially output a gate-on voltage between a time when a pulse of the first scanning start signal for a frame is input to the first stage and a time when a pulse of the second scanning start signal for the frame is input to the last stage, and where the stages output a first low voltage lower than the gate-on voltage after the pulse of the second scanning start signal for the frame is input to the last stage.

## Claims

### Claim 1

A scan driver, comprising:
a plurality of stages dependently connected to each other,
wherein each of the plurality of stages outputs a gate signal,
wherein a first scanning start signal is input to a first stage of the plurality of stages,
wherein a second scanning start signal is input to a last stage of the plurality of stages,
wherein each of the first scanning start signal and the second scanning start signal has a single pulse per frame,
wherein the plurality of stages sequentially outputs gate-on voltages between a time when a pulse of the first scanning start signal for a frame is input to the first stage and a time when a pulse of the second scanning start signal for the frame is input to the last stage,
wherein the plurality of stages outputs a first low voltage lower than the gate-on voltage after the pulse of the second scanning start signal for the frame is input to the last stage, and
wherein each of the plurality of stages includes a low voltage terminal which directly receives the first scanning start signal or the second scanning start signal.

### Claim 2

A scan driver comprising: a plurality of stages dependently connected to each other,
wherein each of the plurality of stages includes a second terminal which directly receives a first driving signal and outputs a gate signal,
wherein a first stage of the plurality of stages further includes a first terminal which directly receives the first driving signal,
wherein a waveform of the first driving signal in a first period and a waveform of the first driving signal in a second period are different from each other, and
wherein at least one stage of the plurality of stages operates in the second period of the first driving signal input to the second terminal and does not operate in the first period of the first driving signal,
the first driving signal includes a scanning start signal having a single pulse per frame.