Shift register pulling control signals according to display mode

Patent metadata

Field	Value
Publication number	US-9711079-B2
Application number	US-201514818321-A
Country	US
Kind code	B2
Filing date	Aug 5, 2015
Priority date	Mar 19, 2015
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A shift register includes a first voltage stabilizing unit, a second voltage stabilizing unit, a main pull-down unit and a main pull-up unit. The first voltage stabilizing unit is used to pull a first driving control signal to a low voltage terminal when a first stabilizing control signal is high. The second voltage stabilizing unit is used to pull the first driving control signal to the low voltage terminal when a second stabilizing control signal is high. The main pull-down unit includes a first sub-pull-down unit controlled by a second gate-terminal signal for pulling down the first driving control signal to the low voltage terminal during a first display mode, and a second sub-pull-down unit controlled by a third gate-terminal signal for pulling down the first driving control signal to the low voltage terminal during a second display mode. The main pull-up unit is used for pulling up a first gate-terminal signal.

First claim

What is claimed is:

1. A shift register comprising:
a first voltage stabilizing unit comprising:
a first pull-down control unit coupled to a low voltage terminal, a first stabilizing control signal source and a first driving control signal source; and
a first pull-down unit coupled to the first pull-down control unit, the low voltage terminal, the first driving control signal source, a first gate-terminal signal source and a first setting signal source, and configured to pull a first gate-terminal signal, a first driving control signal and a first setting signal to the low voltage terminal when a first stabilizing control signal is of a high state;

a second voltage stabilizing unit comprising:
a second pull-down control unit coupled to the low voltage terminal, a second stabilizing control signal source and the first driving control signal source; and
a second pull-down unit coupled to the second pull-down control unit, the low voltage terminal, the first driving control signal source, the first gate-terminal signal source and the first setting signal source, and configured to pull the first gate-terminal signal, the first driving control signal and the first setting signal to the low voltage terminal when a second stabilizing control signal is high, wherein the second stabilizing control signal and the first stabilizing control signal are in opposite phase;

a main pull-down unit comprising:
a first sub-pull-down unit coupled to a second gate-terminal signal source, the first driving control signal source and the low voltage terminal, configured to be controlled by a second gate-terminal signal for pulling down the first driving control signal to the low voltage terminal in a first display mode, and comprising:
a first transistor comprising a gate terminal configured to receive a first pulse signal, a first terminal configured to receive a second pulse signal, and a second terminal;
a second transistor comprising a first terminal, a gate terminal coupled to the second terminal of the first transistor, and a second terminal coupled to the low voltage terminal;
a third transistor comprising a first terminal coupled to a second setting control signal source, a gate terminal coupled to the first terminal of the third transistor, and a second terminal coupled to the first terminal of the second transistor; and
a fourth transistor comprising a first terminal coupled to the second gate-terminal signal source, a gate terminal coupled to the second terminal of the second transistor, and a second terminal; and

a second sub-pull-down unit coupled to a third gate-terminal signal source, the first driving control signal source and the low voltage terminal, configured to be controlled by a third gate-terminal signal for pulling down the first driving control signal to the low voltage terminal in a second display mode, and comprising:
a fifth transistor comprising a first terminal coupled to the second terminal of the fourth transistor, a gate terminal configured to receive a third pulse signal, and a second terminal coupled to the low voltage terminal;
a sixth transistor comprising a first terminal coupled to the third gate-terminal signal source, a second terminal coupled to the first terminal of the fifth transistor, and a gate terminal;
a seventh transistor comprising a gate terminal configured to receive a fourth pulse signal, a first terminal configured to receive a fifth pulse signal, and a second terminal coupled to a gate terminal of the sixth transistor; and
an eighth transistor comprising a first terminal coupled to the first driving control signal source, a second terminal coupled to the low voltage terminal, and a gate terminal coupled to the second terminal of the fourth transistor and the second terminal of the sixth transistor, wherein the first pulse signal and the second pulse signal are in phase, and the fourth pulse signal and the fifth pulse signal are in phase; and

a main pull-up unit comprising:
a pull-up control unit coupled to a pulse signal source and the first driving control signal source; and
a pull-up unit coupled to the pull-up control unit, the pulse signal source, the first gate-terminal signal source and the first driving control signal source, and configured to pull up the first gate-terminal signal.

2. The shift register of claim 1 , wherein the first gate-terminal signal source is an nth gate-terminal signal source, the second gate-terminal signal source is an (n+2)th gate-terminal signal source, the third gate-terminal signal source is an (n+6)th gate-terminal signal source, the first setting signal source is an nth setting signal source, the second setting signal source is an (n+2)th setting signal source, the first driving control signal source is an nth driving control signal source, the first driving control signal is an nth driving control signal, the first gate-terminal signal is an nth gate-terminal signal, the second gate-terminal signal is an (n+2)th gate-terminal signal, the third gate-terminal signal is an (n+6)th gate-terminal signal, the first pulse signal is an nth pulse signal, the second pulse signal is an (n+1)th pulse signal, the third pulse signal is an (n+3)th pulse signal, the fourth pulse signal is an (n+6)th pulse signal, the fifth pulse signal is an (n+7)th pulse signal, the first setting signal is an nth setting signal, the pulse signal source is an nth pulse signal source, wherein n is an odd integer larger than zero.

3. The shift register of claim 1 , wherein the first gate-terminal signal source is an nth gate-terminal signal source, the second gate-terminal signal source is an (n+2)th gate-terminal signal source, the third gate-terminal signal source is an (n+6)th gate-terminal signal source, the first setting signal source is an nth setting signal source, the second setting signal source is an (n+2)th setting signal source, the first driving control signal source is an nth driving control signal source, the first driving control signal is an nth driving control signal, the first gate-terminal signal is an nth gate-terminal signal, the second gate-terminal signal is an (n+2)th gate-terminal signal, the third gate-terminal signal is an (n+6)th gate-terminal signal, the first pulse signal is an (n−1)th pulse signal, the second pulse signal is an nth pulse signal, the third pulse signal is an (n+3)th pulse signal, the fourth pulse signal is an (n+5)th pulse signal, the fifth pulse signal is an (n+6)th pulse signal, the first setting signal is an nth setting signal, the pulse signal source is an nth pulse signal source, wherein n is an even integer larger than zero.

4. A shift register comprising:
a first voltage stabilizing unit comprising:
a first pull-down control unit coupled to a low voltage terminal, a first stabilizing control signal source and a first driving control signal source; and
a first pull-down unit coupled to the first pull-down control unit, the low voltage terminal, the first driving control signal source, a first gate-terminal signal source and a first setting signal source, and configured to pull a first gate-terminal signal, a first driving control signal and a first setting signal to the low voltage terminal when a first stabilizing control signal is of a high state;

a second voltage stabilizing unit comprising:
a second pull-down control unit coupled to the low voltage terminal, a second stabilizing control signal source and the first driving control signal source; and
a second pull-down unit coupled to the second pull-down control unit, the low voltage terminal, the first driving control signal source, the first gate-terminal signal source and the first setting signal source, and configured to pull the first gate-terminal signal, the first driving control signal and the first setting signal to the low voltage terminal when a second stabilizing

Assignees

• Au Optronics Corp

Inventors

• Lin Wei-Li
• Tung Che-Wei
• Chen Chia-Heng

Classifications

• G09G3/003 Primary

  to produce spatial visual effects · CPC title

• G11C19/28

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

• G09G2320/08

  Arrangements within a display terminal for setting, manually or automatically, display parameters of the display terminal · CPC title

• G09G3/2096 Primary

  Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167) · CPC title

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title