Display device

Patent metadata

Field	Value
Publication number	US-9147496-B2
Application number	US-201213486236-A
Country	US
Kind code	B2
Filing date	Jun 1, 2012
Priority date	Jun 1, 2011
Publication date	Sep 29, 2015
Grant date	Sep 29, 2015

Abstract

A driving circuit of a display device includes first to third output signal lines which are continuously arranged, a first transistor that has a source connected to the second output signal line and a drain connected to a first clock signal line, and a second transistor that provides a non-active potential to a gate of the first transistor when a second clock signal becomes the active potential, wherein a circuit that outputs the active potential to the first output signal line and the third output signal line is disposed at an opposite side to a circuit that outputs the active potential to the second output signal line with a display region interposed therebetween, and wherein the gate of the first transistor is connected to the first output signal line and the third output signal line via rectifying circuits.

First claim

What is claimed is:

1. A display device comprising:
a driving circuit that sequentially applies an active potential and a non-active potential to a plurality of output signal lines, where the active potential is a predetermined voltage which is able to turn on a pixel transistor and the non-active potential is a predetermined voltage which is able to turn off the pixel transistor,
wherein the driving circuit comprises
a first output signal line (G 2 i −1), a second output signal line (G 2 i ), and a third output signal line (G 2 i+ 1) comprising the plurality of output signal lines and are three output signal lines which are continuously arranged;
a first clock signal line to which a first clock signal (CK 1 ) which oscillates between the active potential and the non-active potential is applied;
a second clock signal line to which a second clock signal (CK 2 ) which oscillates between the active potential and the non-active potential is applied;
a third clock signal line to which a third clock signal (CK 3 ) which oscillates between the active potential and the non-active potential is applied; and
a fourth clock signal line to which a fourth clock signal (CK 4 ) which oscillates between the active potential and the non-active potential is applied;

wherein the first clock signal has an active potential period in which the first clock signal is the active potential,
the second clock signal has an active potential period in which the second clock signal is the active potential,
the third clock signal has an active potential period in which the third clock signal is the active potential,
the fourth clock signal has an active potential period in which the fourth clock signal is the active potential, and
each of the active potential periods of the first to fourth clock signals does not temporally overlap each other,
wherein the driving circuit further comprises a first output circuit configured to output the active potential to the first output signal line, a second output circuit configured to output the active potential to the second output signal line, a third output circuit configured to output the active potential to the third output signal line,
wherein, when the active potential is output to the first to third output signal lines in order of the first output signal line, the second output signal line and the third output signal line, the first to fourth clock signals are four-phase clock which becomes the active potential in order of the first clock signal (CK 1 ), the second clock signal (CK 2 ), the third clock signal (CK 3 ) and the fourth clock signal (CK 4 ),
wherein, when the active potential is output to the first to third output signal lines in order of the third output signal line, the second output signal line and the first output signal line, the first to fourth clock signals are four-phase clock which becomes the active potential in order of the fourth clock signal (CK 4 ), the third clock signal (CK 3 ), the second clock signal (CK 2 ) and the first clock signal (CK 1 ), and
wherein the driving circuit further comprises a first transistor in the second output circuit, the first transistor has a source and a drain, one of the source and the drain of the first transistor is connected to the second output signal line for outputting the active potential to the second output signal line and the other of the source and the drain is connected to the second clock signal line, and when the second clock signal becomes the active potential, the first transistor outputs the active potential to the second output signal line through the one of the source and the drain of the first transistor; and
wherein the driving circuit further comprises a second transistor in the second output circuit, the second transistor provides the non-active potential to a gate of the first transistor of the second output circuit when the fourth clock signal becomes the active potential,
wherein the first and third output circuits are disposed at an opposite side to the second output circuit with a display region interposed therebetween, and
wherein the gate of the first transistor of the second output circuit is connected to the first output signal line and the third output signal line through a first rectifying circuit and a second rectifying circuit, respectively, the active potential of the first output signal line is applied to the gate of the first transistor of the second output circuit through the first rectifying circuit from the first output signal line, and the active potential of the third output signal is applied to the gate of the first transistor of the second output circuit through the second rectifying circuit from the third output signal line.

2. The display device according to claim 1 , wherein the first output signal line (G 2 i ) outputs the active potential when a first clock signal (CK 1 ) is applied thereto,
wherein the third output signal line (G 2 i+ 1) outputs the active potential when a third clock signal (CK 3 ) is applied thereto.

3. The display device according to claim 1 , wherein the driving circuit further comprises a third transistor whose gate is fixed to an intermediate voltage value which is smaller than the active potential, the third transistor is provided between the gate of the first transistor and either of a source and a drain of the second transistor.

4. The display device according to claim 1 , wherein the driving circuit further comprises a fourth transistor whose gate is fixed to an intermediate voltage value which is smaller than the active potential, the fourth transistor is provided between the fourth clock signal line and a gate of a fifth transistor, the fifth transistor outputs the non-active potential to the second output signal line during a period when the second output signal line does not output the active potential.

5. The display device according to claim 1 , wherein one of the source and the drain of the first transistor is directly connected to the second output signal line for outputting the active potential to the second output signal line and the other of the source and the drain of the first transistor is directly connected to the second clock signal line, wherein the second transistor configured to provide the non-active potential to the gate of the first transistor when the fourth clock signal becomes the active potential, and
wherein the gate of the first transistor is connected to the first output signal line and the third output signal line via rectifying circuits, respectively.

Assignees

• Abe Hiroyuki
• Maki Masahiro
• Komatsu Hiroaki
• Japan Display Inc

Inventors

• Abe Hiroyuki
• Maki Masahiro
• Komatsu Hiroaki

Classifications

• G09G2310/0202

  Addressing of scan or signal lines · CPC title

• G09G2310/08

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

• G09G3/2018

  by time modulation using two or more time intervals · CPC title

• G11C19/28 Primary

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

• G09G2310/0283

  Arrangement of drivers for different directions of scanning · CPC title