SHIFT REGISTER, GATE DRIVING CIRCUIT AND DISPLAY DEVICE

• US 20180190364A1
• Filed: 09/18/2017
• Published: 07/05/2018
• Est. Priority Date: 01/03/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Granted Patent: US 10,622,081 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 2310/0267 Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: 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
• CPC Class Codes: G09G 3/3674 Details of drivers for scan electrodes
• CPC Class Codes: G11C 19/184 with field-effect transistors, e.g. MOS-FET
• CPC Class Codes: G11C 19/28 using semiconductor elements G11C19/14, G11C19/36 take precedence
• CPC Class Codes: G11C 8/04 using a sequential addressing device, e.g. shift register, counter

Abstract

A shift register, a gate driving circuit and a display device are disclosed. The shift register includes a first inputting circuit, a second inputting circuit, an outputting circuit, a node controlling circuit, a potential hold circuit and an output-noise reduction circuit. The first inputting circuit and the second inputting circuit are to implement inputting to the first node and resetting of the first node. The node control circuit controls potentials of the first node and the second node. The outputting circuit controls the signal of the signal outputting terminal under control of the first node and the second node. The potential hold circuit can continuously charge the first node within a touch control period. The output-noise reduction circuit can perform noise reduction for the signal outputting terminal in the touch control period.

Claims

1. A shift register comprising:

a first inputting circuit,

a second inputting circuit,

an outputting circuit,

a node controlling circuit,

a potential hold circuit, and

an output-noise reduction circuit,

wherein the first inputting circuit is configured to, under control of an input signal terminal, provide a signal from a first reference signal terminal to a first node PU,

wherein the second inputting circuit is configured to, under control of a resetting signal terminal, provide a signal from a second reference signal terminal to the first node PU,

wherein the outputting circuit is configured to, under control of the first node PU, provide a first clock signal from a first clock signal terminal to a signal outputting terminal of the shift register, and the outputting circuit is further configured to, under control of a second node, provide a signal from a third reference signal terminal to the signal outputting terminal,

wherein the potential hold circuit is configured to, under control of both the first node and a touch control terminal, provide a signal from the touch control terminal to the first node PU,

wherein the output-noise reduction circuit is configured to, under control of the touch control terminal, provide the signal from the third reference signal terminal to the signal outputting terminal,

wherein the node controlling circuit is configured to, under control of the first node, provide the signal from the third reference signal terminal to the second node,

wherein the node controlling circuit is further configured to, under control of a second clock signal terminal, provide a second clock signal from the second clock signal terminal to the second node,

wherein the node controlling circuit is further configured to, when the second node is in a floating state, hold a stable potential difference between the second node and the first clock signal terminal,

wherein phases of the first clock signal and the second clock signal are opposite.

2. The shift register of claim 1, wherein the first inputting circuit comprises a first transistor,

wherein a gate electrode of the first transistor is connected with the input signal terminal, a first electrode of the first transistor is connected with the first reference signal terminal, and a second electrode of the first transistor is connected with the first node.

3. The shift register of claim 1, wherein the second inputting circuit comprises a second transistor,

wherein a gate electrode of the second transistor is connected with the resetting signal terminal, a first electrode of the second transistor is connected with the second reference signal terminal, and a second electrode of the second transistor is connected with the first node.

4. The shift register of claim 1, wherein the outputting circuit comprises a third transistor, a fourth transistor and a first capacitor,

wherein a gate electrode of the third transistor is connected with the first node, a first electrode of the third transistor is connected with the first clock signal terminal, and a second electrode of the third transistor is connected with the signal outputting terminal,

wherein a gate electrode of the fourth transistor is connected with the second node, a first electrode of the fourth transistor is connected with the third reference signal terminal, and a second electrode of the fourth transistor is connected with the signal outputting terminal,

wherein the first capacitor is connected between the first node and the signal outputting terminal.

5. The shift register of claim 1, wherein the node control circuit comprises a fifth transistor, a sixth transistor and a second capacitor,

wherein a gate electrode of the fifth transistor is connected with the first node, a first electrode of the fifth transistor is connected with the third reference signal terminal, and a second electrode of the fifth transistor is connected with the second node,

wherein a gate electrode and a first electrode of the sixth transistor are connected with the second clock signal terminal, and a second electrode of the sixth transistor is connected with the second node,

wherein the second capacitor is connected between the second node and the first clock signal terminal.

6. The shift register of claim 1, wherein the potential hold circuit comprises a seventh transistor and an eighth transistor,

wherein a gate electrode of the seventh transistor is connected with the first node, a first electrode of the seventh transistor is connected with the touch control terminal, and a second electrode of the seventh transistor is connected with a gate electrode of the eighth transistor,

wherein a first electrode of the eighth transistor is connected with the touch control terminal, and a second electrode of the eighth transistor is connected with the first node.

7. The shift register of claim 1, wherein the potential hold circuit comprises a seventh transistor and an eighth transistor,

wherein a gate electrode and a first electrode of the seventh transistor are connected with the first node, and a second electrode of the seventh transistor is connected with a first electrode of the eighth transistor,

wherein a gate electrode and a second electrode of the eighth transistor are connected with the touch control terminal.

8. The shift register of claim 1, wherein the output-noise reduction circuit comprises a ninth transistor,

wherein a gate electrode of the ninth transistor is connected with touch control terminal, a first electrode of the ninth transistor is connected with the third reference signal terminal, and a second electrode of the ninth transistor is connected with the signal outputting terminal.

9. The shift register of claim 1, further comprising a node-noise reduction circuit,

wherein the node-noise reduction circuit is configured to, under control of the second node, provide the signal from the third reference signal terminal to the first node.

10. The shift register of claim 9, wherein the node-noise reduction circuit comprises a tenth transistor,

wherein a gate electrode of the tenth transistor is connected with the second node, a first electrode of the tenth transistor is connected with the third reference signal terminal, and a second electrode of the tenth transistor is connected with the first node.

11. The shift register of claim 1, wherein the first inputting circuit comprises a first transistor, a gate electrode of the first transistor is connected with the input signal terminal, a first electrode of the first transistor is connected with the first reference signal terminal, and a second electrode of the first transistor is connected with the first node,

wherein the second inputting circuit comprises a second transistor, wherein a gate electrode of the second transistor is connected with the resetting signal terminal, a first electrode of the second transistor is connected with the second reference signal terminal, and a second electrode of the second transistor is connected with the first node,

wherein the outputting circuit comprises a third transistor, a fourth transistor and a first capacitor, a gate electrode of the third transistor is connected with the first node, a first electrode of the third transistor is connected with the first clock signal terminal, and a second electrode of the third transistor is connected with the signal outputting terminal, a gate electrode of the fourth transistor is connected with the second node, a first electrode of the fourth transistor is connected with the third reference signal terminal, and a second electrode of the fourth transistor is connected with the signal outputting terminal, the first capacitor is connected between the first node and the signal outputting terminal,

wherein the node control circuit comprises a fifth transistor, a sixth transistor and a second capacitor, a gate electrode of the fifth transistor is connected with the first node, a first electrode of the fifth transistor is connected with the third reference signal terminal, and a second electrode of the fifth transistor is connected with the second node, a gate electrode and a first electrode of the sixth transistor are connected with the second clock signal terminal, and a second electrode of the sixth transistor is connected with the second node, the second capacitor is connected between the second node and the first clock signal terminal,

wherein the potential hold circuit comprises a seventh transistor and an eighth transistor, a gate electrode of the seventh transistor is connected with the first node, a first electrode of the seventh transistor is connected with the touch control terminal, and a second electrode of the seventh transistor is connected with a gate electrode of the eighth transistor, a first electrode of the eighth transistor is connected with the touch control terminal, and a second electrode of the eighth transistor is connected with the first node.

12. The shift register of claim 11, wherein the output-noise reduction circuit comprises a ninth transistor, a gate electrode of the ninth transistor is connected with touch control terminal, a first electrode of the ninth transistor is connected with the third reference signal terminal, and a second electrode of the ninth transistor is connected with the signal outputting terminal.

13. The shift register of claim 12, wherein the node-noise reduction circuit comprises a tenth transistor, a gate electrode of the tenth transistor is connected with the second node, a first electrode of the tenth transistor is connected with the third reference signal terminal, and a second electrode of the tenth transistor is connected with the first node.

14. The shift register of claim 13, wherein all of the transistor are N-type transistors or P-type transistors.

15. The shift register of claim 1, wherein the first inputting circuit comprises a first transistor, a gate electrode of the first transistor is connected with the input signal terminal, a first electrode of the first transistor is connected with the first reference signal terminal, and a second electrode of the first transistor is connected with the first node,

wherein the second inputting circuit comprises a second transistor, wherein a gate electrode of the second transistor is connected with the resetting signal terminal, a first electrode of the second transistor is connected with the second reference signal terminal, and a second electrode of the second transistor is connected with the first node,

wherein the outputting circuit comprises a third transistor, a fourth transistor and a first capacitor, a gate electrode of the third transistor is connected with the first node, a first electrode of the third transistor is connected with the first clock signal terminal, and a second electrode of the third transistor is connected with the signal outputting terminal, a gate electrode of the fourth transistor is connected with the second node, a first electrode of the fourth transistor is connected with the third reference signal terminal, and a second electrode of the fourth transistor is connected with the signal outputting terminal, the first capacitor is connected between the first node and the signal outputting terminal,

wherein the node control circuit comprises a fifth transistor, a sixth transistor and a second capacitor, a gate electrode of the fifth transistor is connected with the first node, a first electrode of the fifth transistor is connected with the third reference signal terminal, and a second electrode of the fifth transistor is connected with the second node, a gate electrode and a first electrode of the sixth transistor are connected with the second clock signal terminal, and a second electrode of the sixth transistor is connected with the second node, the second capacitor is connected between the second node and the first clock signal terminal,

wherein the potential hold circuit comprises a seventh transistor and an eighth transistor, a gate electrode and a first electrode of the seventh transistor are connected with the first node, and a second electrode of the seventh transistor is connected with a first electrode of the eighth transistor, a gate electrode and a second electrode of the eighth transistor are connected with the touch control terminal.

16. The shift register of claim 15, wherein the output-noise reduction circuit comprises a ninth transistor, a gate electrode of the ninth transistor is connected with touch control terminal, a first electrode of the ninth transistor is connected with the third reference signal terminal, and a second electrode of the ninth transistor is connected with the signal outputting terminal.

17. The shift register of claim 16, wherein the node-noise reduction circuit comprises a tenth transistor, a gate electrode of the tenth transistor is connected with the second node, a first electrode of the tenth transistor is connected with the third reference signal terminal, and a second electrode of the tenth transistor is connected with the first node.

18. The shift register of claim 17, wherein all of the transistor are N-type transistors or P-type transistors.

19. A gate driving circuit comprising:

a plurality of cascaded shift registers of claim 1,

wherein except for a first shift register, the signal outputting terminal of each of the rest of the shift registers is connected with the resetting signal terminal of a previous shift register which is adjacent the each of the rest of the shift registers;

wherein except for a last shift register, the signal outputting terminal of each one of the rest of the shift registers is connected with the input signal terminal of a next shift register which is adjacent the each one of the rest of the shift registers.

20. A display device comprising:

the gate driving circuit of claim 19.