Shift register unit circuit, shift register, driving method, and display apparatus

Patent metadata

Field	Value
Publication number	US-2016293091-A1
Application number	US-201514778072-A
Country	US
Kind code	A1
Filing date	Mar 23, 2015
Priority date	Oct 31, 2014
Publication date	Oct 6, 2016
Grant date	—

Abstract

The present disclosure relates to the field of display technology, and discloses a shift register unit circuit, comprising a trigger signal end, a first clock end, a second clock end, a reset end, a gate output end, a low level end, a storage capacitor, a reset module, a first pull-down module, a second pull-down module, a charging module, and an output control module. The present disclosure further discloses a shift register, a driving method, and a display apparatus. The shift register unit circuit according to the present disclosure avoids a power loss, thereby reducing the power consumption of the whole circuit.

First claim

1 . A shift register unit circuit, comprising: a trigger signal end, a first clock end, a second clock end, a reset end, a gate output end, a low level end, a storage capacitor, a reset module, a first pull-down module, a second pull-down module, a charging module, and an output control module, wherein,
the charging module has a first input end and a first control end connected to the trigger signal end, and a first output end connected to a first end of the storage capacitor to charge the storage capacitor when the trigger signal end is at a high level; and a second input end connected to the first end of the storage capacitor, a second control end connected to the first clock end, and a second output end connected to the trigger signal end to pull a voltage at the first end of the storage capacitor to a low level when the first clock end is at a high level and the trigger signal end is at a low level; the output control module has an input end connected to the second clock end, a control end connected to the first end of the storage capacitor, and an output end connected to the gate output end, to output a high level signal at the second clock end to the gate output end when the first end of the storage capacitor is at a high level, so that the gate output end is at a high level; and the storage capacitor has a second end connected to the gate output end; the first pull-down module has a first control end connected to the first clock end, a first input end connected to the gate output end, a first output end connected to the low level end, a second control end connected to the first end of the storage capacitor, a second input end connected to the first clock end, and a second output end connected to the low level end; and the second pull-down module has an input end connected to the gate output end, a control end connected to an intermediate control node of the first pull-down module, and an output end connected to the first end of the storage capacitor, wherein the first pull-down module is configured to pull a voltage at the gate output end to a low level, and trigger the second pull-down module through the intermediate control node to pull voltages at both ends of the storage capacitor to a low level when the first end of the storage capacitor is at a low level; and the reset module has an input end connected to the first end of the storage capacitor, a control end connected to the reset end, and an output end connected to the gate output end, to pull the voltages at both ends of the storage capacitor to a low level under the control of the reset end.

2 . The shift register unit circuit according to claim 1 , wherein the charging module comprises a fourth transistor and a fifth transistor, wherein the fourth transistor has a gate and a source connected to the trigger signal end, and a drain connected to the first end of the storage capacitor, to transmit a high level signal at the trigger signal end to the first end of the storage capacitor; and the fifth transistor has a gate connected to the first clock end, a source connected to the first end of the storage capacitor, and a drain connected to the trigger signal end, to pull the voltage at the first end of the storage capacitor to a low level when the first clock end is at a high level and the trigger signal end is at a low level.

3 . The shift register unit circuit according to claim 2 , wherein the output control module comprises a first transistor, wherein the first transistor has a gate connected to the first end of the storage capacitor, a source connected to the second clock end, and a drain connected to the gate output end, to output the high level signal at the second clock end to the gate output end when the first end of the storage capacitor is at a high level.

4 . The shift register unit circuit according to claim 3 , wherein the first pull-down module comprises an eighth transistor, a ninth transistor, and a tenth transistor; and the second pull-down module comprises a third transistor and a seventh transistor; wherein,
the ninth transistor has a gate and a source connected to the first clock end, and a drain connected to a source of the eighth transistor, the eighth transistor has a gate connected to the first end of the storage capacitor, and a drain connected to the low level end, the tenth transistor has a gate connected to the first clock end, a source connected to the gate output end, and a drain connected to the low level end, the third transistor has a gate connected to the source of the eighth transistor, a source connected to the gate output end, and a drain connected to the low level end, and the seventh transistor has a gate connected to the source of the eighth transistor, a source connected to the low level end, and a drain connected to the first end of the storage capacitor; the eighth transistor and the ninth transistor are configured to form a path from the first clock end to the low level end when the first end of the storage capacitor is at a high level, or to change a voltage of the source of the eighth transistor to a high level when the first end of the storage capacitor is at a low level, so that the third transistor and the seventh transistor are turned on, to pull the voltages at both ends of the storage capacitor to a low level; and the tenth transistor is configured to pull the voltage at the gate output end to a low level when the first clock end is at a high level.

5 . The shift register unit circuit according to claim 4 , wherein the reset module comprises a second transistor and a sixth transistor, wherein the second transistor has a gate connected to the reset end, a source connected to the low level end, and a drain connected to the gate output end, to pull the voltage at the gate output end to a low level when the reset end is at a high level; and the sixth transistor has a gate connected to the reset end, a source connected to the first end of the storage capacitor, and a drain connected to the low level end, to pull the voltage at the first end of the storage capacitor to a low level when the reset end is at a high level.

6 . A method for driving the shift register unit circuit according to claim 5 , comprising:
applying a high level to the trigger signal end and the first clock end, and applying a low level to the second clock end and the reset end, so that the storage capacitor is charged by the charging module, and a voltage at the gate output end is pulled by the first pull-down module to a low level; applying a low level to the trigger signal end, the first clock end, and the reset end, and applying a high level to the second clock end, so that the first end of the storage capacitor is maintained at a high level, and the gate output end is controlled by the output control module to output a high level of the second clock end; applying a high level to the first clock end and the reset end, and applying a low level to the second clock end and the trigger signal end, so that the voltages at both ends of the storage capacitor and the gate output end are pulled by the reset module to a low level; applying a low level to the trigger signal end, the first clock end, and the reset end, and applying a high level to the second clock end, so that the voltages at both ends of the storage capacitor and the gate output end are pulled by the second pull-down module to a low level; and applying a low level to the trigger signal end, the second clock end, and the reset end, and applying a high level to the first clock end, so that the voltage at the gate output end is pulled by the first pull-down module to a low level, and voltages at both ends of the storage capacitor are pulled by the second pull-down module to a low level.

7 . The method according to claim 6 , wherein the step of applying

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Wang Zheng

Classifications

• G09G2310/0289

  Details of voltage level shifters arranged for use in a driving circuit · CPC title

• G09G2310/08

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

• G09G3/2092 Primary

  Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165) · CPC title

• G11C19/28

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

• G09G3/36

  using liquid crystals · CPC title