# US 2020/0286572 A1 · Gate driving circuit and shift register controlling method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0286572 A1 - Document ID: US20200286572A1 - Status: Published application - Kind: A1 - Application number: 16/679,377 - Filed: 2019-11-11 - Published: 2020-09-10 - Earliest claimed: 2019-03-08 - Assignees: Au Optronics Corporation - Applicants: AU Optronics Corporation - Inventors: Er-Lang DENG; Yuan-Nan CHIU; Chih-Yuan WU; Yu-Lin HUANG; I-Sheng LIN; Kuo-Ting YANG - Web page: https://patentgrep.com/patent/US20200286572A1 ## CPC - G11C 19/287: {Organisation of a multiplicity of shift registers} - 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 3/3677: {suitable for active matrices only} - G11C 19/28: using semiconductor elements (G11C19/14, G11C19/36 take precedence) - G09G 2310/0286: Details of a shift registers arranged for use in a driving circuit - G09G 2310/061: for resetting or blanking - G11C: STATIC STORES (semiconductor memory devices H10B) - 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 gate driving circuit comprises a plurality of shift registers coupled in serial. An nth shift register includes a driving circuit, a pull-up circuit and a first auxiliary voltage regulator circuit. The driving circuit is electrically coupled to an output node and a first node. The driving circuit is configured to receive a clock signal and output a gate signal according to the clock signal. The pull-up circuit is electrically coupled to the driving circuit. The first auxiliary voltage regulator circuit is electrically coupled to the pull-up circuit and a second node. The first auxiliary voltage regulator circuit is configured to receive a control signal and the second node corresponding to a second voltage. ## Claims ### Claim 1 A gate driving circuit comprises a plurality of shift registers coupled in serial, wherein an nth shift register comprising: a driving circuit, electrically coupled to an output node and a first node, is configured to receive a clock signal and output a gate signal according to the clock signal; a pull-up circuit, electrically coupled to the driving circuit; and a first auxiliary voltage regulator circuit, electrically coupled to the pull-up circuit and a second node, and is configured to receive a control signal and the second node corresponding to a second voltage. ### Claim 2 (depends on 1) The gate driving circuit of claim 1, wherein the pull-up circuit is configured to receive the clock signal, a high voltage level and an (n−4)th transmitting signal, and raise an nth first voltage of the first node to an operating voltage. ### Claim 3 (depends on 2) The gate driving circuit of claim 2, further comprising: a second auxiliary voltage regulator circuit, electrically coupled to the pull-up circuit and a third node, and is configured to receive the control signal and the third node corresponding to a third voltage, and maintain the nth first voltage to a second low voltage level. ### Claim 4 (depends on 2) The gate driving circuit of claim 2, further comprising: a pull-down circuit, electrically coupled to the driving circuit and the first node, is configured to receive an (n+4)th transmitting signal and an (n+4)th gate signal; pull down the gate signal to a first low voltage level and pull down the nth first voltage to the second low voltage level. ### Claim 5 (depends on 3) The gate driving circuit of claim 3, further comprising: a first voltage regulator circuit, electrically coupled to a fourth node, the pull-up circuit, and the first auxiliary voltage regulator circuit, and is configured to receive the second node corresponding to the second voltage; maintain the gate signal to a first low voltage level, and maintain the nth first voltage and an nth transmitting signal to the second low voltage level; and a second voltage regulator circuit, electrically coupled to the fourth node, the pull-up circuit, and the second auxiliary voltage regulator circuit, and is configured to receive the third node corresponding to the third voltage; maintain the gate signal to the first low voltage level, and maintain the nth first voltage and the nth transmitting signal to the second low voltage level. ### Claim 6 (depends on 5) The gate driving circuit of claim 5, further comprising: a first voltage regulator control circuit, electrically coupled to the first auxiliary voltage regulator circuit, and is configured to receive a first operating signal, the nth first voltage, and a (n−2)th first voltage, and control the first auxiliary voltage regulator circuit and the first voltage regulator circuit; and a second voltage regulator control circuit, electrically coupled to the second auxiliary voltage regulator circuit, and is configured to receive a second operating signal, the nth first voltage, and a (n−2)th first voltage, and control the second auxiliary voltage regulator circuit and the second voltage regulator circuit. ### Claim 7 (depends on 1) The gate driving circuit of claim 1, further comprising: a reset circuit, electrically coupled to the pull-up circuit, and is configured to receive a starting signal and reset an nth first voltage according to the starting signal. ### Claim 8 (depends on 1) The gate driving circuit of claim 1, wherein the driving circuit, further comprising: a transistor, comprising a first end, a second end, and a control end, wherein the first end is configured to receive the clock signal; the second end is electrically coupled to the output node, and the control end is electrically coupled to the first node. ### Claim 9 (depends on 2) The gate driving circuit of claim 2, wherein the pull-up circuit, further comprising: a first transistor, comprising a first end, a second end, and a first control end, wherein the first end is configured to receive the high voltage level; the second end is electrically coupled to the first node, and the first control end is configured to receive to the (n−4)th transmitting signal; and a second transistor, comprising a third end, a fourth end, and a second control end, wherein the third end is configured to receive the clock signal; the fourth end is electrically coupled to a fourth node, and the second control end is electrically coupled to the second end. ### Claim 10 (depends on 1) The gate driving circuit of claim 1, wherein the first auxiliary voltage regulator circuit, further comprising: a first transistor, comprising a first end, a second end, and a first control end, wherein the first end is electrically coupled to the first node, and the first control end is electrically coupled to the second node; and a second transistor, comprising a third end, a fourth end, and a second control end, wherein the third end is electrically coupled to the second end; the fourth end is electrically coupled to a second low voltage level, and the second control end is configured to receive the control signal. ### Claim 11 (depends on 10) The gate driving circuit of claim 10, wherein when the control signal switches to an enable level, the second transistor is conducted, and the first transistor and the second transistor maintains an nth first voltage to the second low voltage level. ### Claim 12 (depends on 3) The gate driving circuit of claim 3, wherein the second auxiliary voltage regulator circuit, further comprising: a first transistor, comprising a first end, a second end, and a first control end, wherein the first end is electrically coupled to the first node, and the first control end is electrically coupled to the third node; and a second transistor, comprising a third end, a fourth end, and a second control end, wherein the third end is electrically coupled to the second end; the fourth end is electrically coupled to the second low voltage level, and the second control end is configured to receive the control signal. ### Claim 13 (depends on 12) The gate driving circuit of claim 12, wherein when the control signal switches to an enable level, the second transistor is conducted, and the first transistor and the second transistor maintains the nth first voltage to the second low voltage level. ### Claim 14 (depends on 4) The gate driving circuit of claim 4, wherein the pull-down circuit, further comprising: a first transistor, comprising a first end, a second end, and a first control end, wherein the first end is electrically coupled to the output node; the second end is electrically coupled to the first low voltage, and the first control end is configured to receive the (n+4)th gate signal; and a second transistor, comprising a third end, a fourth end, and a second control end, wherein the third end is electrically coupled to the first end; the fourth end is electrically coupled to the second low voltage level, and the second control end is configured to receive the (n+4)th transmitting signal. ### Claim 15 (depends on 5) The gate driving circuit of claim 5, wherein the first voltage regulator circuit, further comprising: a first transistor, comprising a first end, a second end, and a first control end, wherein the first end is electrically coupled to the fourth node; the second end is electrically coupled to the second low voltage level, and the first control end is electrically coupled to the second node; a second transistor, comprising a third end, a fourth end, and a second control end, wherein the third end is electrically coupled to the output node; the fourth end is electrically coupled to the first low voltage level, and the second control end is electrically coupled to the second node; and a third transistor, comprising a fifth end, a sixth end, and a third control end, wherein the fifth end is electrically coupled to the first end; the sixth end is electrically coupled to the second low voltage level, and the third control end is electrically coupled to the second node. ### Claim 16 (depends on 5) The gate driving circuit of claim 5, wherein the second voltage regulator circuit, further comprising: a first transistor, comprising a first end, a second end, and a first control end, wherein the first end is electrically coupled to the fourth node; the second end is electrically coupled to the second low voltage level, and the first control end is electrically coupled to the third node; a second transistor, comprising a third end, a fourth end, and a second control end, wherein the third end is electrically coupled to the output node; the fourth end is electrically coupled to the first low voltage level, and the second control end is electrically coupled to the third node; and a third transistor, comprising a fifth end, a sixth end, and a third control end, wherein the fifth end is electrically coupled to the first end; the sixth end is electrically coupled to the second low voltage level, and the third control end is electrically coupled to the third node. ### Claim 17 (depends on 6) The gate driving circuit of claim 6, wherein the first voltage regulator control circuit, further comprising: a first transistor, comprising a first end, a second end, and a first control end, wherein the first end is electrically coupled to the first control end, and the first control end is configured to receive the first operating signal; a second transistor, comprising a third end, a fourth end, and a second control end, wherein the third end is electrically coupled to the first end; the fourth end is electrically coupled to the second node, and the second control end is electrically coupled to the second end; a third transistor, comprising a fifth end, a sixth end, and a third control end, wherein the fifth end is electrically coupled to the second control end; the sixth end is electrically coupled to the second low voltage level, and the third control end is configured to receive the nth first voltage; a fourth transistor, comprising a seventh end, an eighth end, and a fourth control end, wherein the seventh end is electrically coupled to the second node; the eighth end is electrically coupled to the second low voltage level, and the fourth control end is configured to receive the nth first voltage; a fifth transistor, comprising a ninth end, a tenth end, and a fifth control end, wherein the ninth end is electrically coupled to the second end; the tenth end is electrically coupled to the second low voltage level, and the fifth control end is configured to receive the (n−2)th first voltage; and a sixth transistor, comprising a eleventh end, a twelfth end, and a sixth control end, wherein the eleventh end is electrically coupled to the second node; the twelfth end is electrically coupled to the second low voltage level, and the sixth control end is configured to receive the (n−2)th first voltage. ### Claim 18 (depends on 6) The gate driving circuit of claim 6, wherein the second voltage regulator control circuit, further comprising: a first transistor, comprising a first end, a second end, and a first control end, wherein the first end is electrically coupled to the first control end, and the first control end is configured to receive the second operating signal; a second transistor, comprising a third end, a fourth end, and a second control end, wherein the third end is electrically coupled to the first end; the fourth end is electrically coupled to the third node, and the second control end is electrically coupled to the second end; a third transistor, comprising a fifth end, a sixth end, and a third control end, wherein the fifth end is electrically coupled to the second control end; the sixth end is electrically coupled to the second low voltage level, and the third control end is configured to receive the nth first voltage; a fourth transistor, comprising a seventh end, an eighth end, and a fourth control end, wherein the seventh end is electrically coupled to the third node; the eighth end is electrically coupled to the second low voltage level, and the fourth control end is configured to receive the nth first voltage; a fifth transistor, comprising a ninth end, a tenth end, and a fifth control end, wherein the ninth end is electrically coupled to the second end; the tenth end is electrically coupled to the second low voltage level, and the fifth control end is configured to receive the (n−2)th first voltage; and a sixth transistor, comprising a eleventh end, a twelfth end, and a sixth control end, wherein the eleventh end is electrically coupled to the third node; the twelfth end is electrically coupled to the second low voltage level, and the sixth control end is configured to receive the (n−2)th first voltage. ### Claim 19 (depends on 7) The gate driving circuit of claim 7, wherein the reset circuit, further comprising: a transistor, comprising a first end, a second end, and a control end, wherein the first end is electrically coupled to the first node; the second end is electrically coupled to the second low voltage level, and the control end is configured to receive the starting signal. ### Claim 20 A shift register controlling method, comprising: when a shift register circuit operates at a first update rate, a control signal is switched to an enable level, and a first auxiliary voltage regulator circuit maintains voltage of a first node to a second low voltage level; and when the shift register circuit operates at a second update rate, the control signal is switched to a disable level to reduce a leakage current at the first node of the shift register circuit; wherein, the first auxiliary voltage regulator circuit comprises a first transistor and a second transistor. ### Claim 21 (depends on 20) The shift register controlling method of claim 20, further comprising: when a shift register circuit operates at the first update rate, the control signal is switched to the enable level, and a second auxiliary voltage regulator circuit maintains voltage of the first node to the second low voltage level, wherein the second auxiliary voltage regulator circuit comprises a third transistor and a fourth transistor. ### Claim 22 (depends on 20) The shift register controlling method of claim 20, wherein when the control signal and a first operating signal switch to the enable level, the first transistor and the second transistor are conducted; when the control signal and a second operating signal switch to the enable level, the third transistor and the fourth transistor are conducted, and the first transistor, the second transistor, the third transistor and the fourth transistor are configured to maintains the first voltage to the second low voltage level. ### Claim 23 (depends on 21) The shift register controlling method of claim 21, wherein when the control signal switches to the disable level, the second transistor and the fourth transistor are turned off.