# US 11,114,048 B1 · Driving circuit adaptable to an electrophoretic display > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,048 B1 - Document ID: US11114048B1 - Status: Granted - Kind: B1 - Application number: 17/116,267 - Filed: 2020-12-09 - Granted: 2021-09-07 - Earliest claimed: 2020-12-09 - Assignees: Himax Technologies Limited - Applicants: Himax Technologies Limited - Inventors: Han Wen Huang - Web page: https://patentgrep.com/patent/US11114048B1 ## CPC - G09G 3/344: {based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167)} - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - 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 driving circuit adaptable to an electrophoretic display includes a first transistor and a second transistor electrically connected in series between a first positive voltage node and a first negative voltage node, the first transistor and the second transistor being interconnected at an output node; a third transistor electrically connected between the output node and a ground; a first voltage regulator that switchably provides one of a plurality of positive supply voltages to the first positive voltage node; a second voltage regulator that provides a negative supply voltage to the first negative voltage node; a switching circuit having a plurality of outputs electrically connected to the first transistor, the second transistor and the third transistor to turn on or off the first transistor, the second transistor and the third transistor respectively; and a controller that controls the first voltage regulator, the second voltage regulator and the switching circuit. ## Claims ### Claim 1 A driving circuit adaptable to an electrophoretic display, comprising: a first transistor and a second transistor electrically connected in series between a first positive voltage node and a first negative voltage node, the first transistor and the second transistor being interconnected at an output node; a third transistor electrically connected between the output node and a ground; a first voltage regulator that switchably provides one of a plurality of positive supply voltages to the first positive voltage node; a second voltage regulator that provides a negative supply voltage to the first negative voltage node; a switching circuit having a plurality of outputs electrically connected to the first transistor, the second transistor and the third transistor to turn on or off the first transistor, the second transistor and the third transistor respectively; and a controller that controls the first voltage regulator, the second voltage regulator and the switching circuit. ### Claim 2 (depends on 1) The driving circuit of claim 1, wherein the first transistor has a first type, the second transistor has a second type being opposite to the first type, and the third transistor has the second type. ### Claim 3 (depends on 2) The driving circuit of claim 2, wherein a source of the first transistor is electrically connected to the first positive voltage node, a drain of the first transistor is electrically connected to a drain of the second transistor at the output node, a source of the second transistor is electrically connected to the first negative voltage node, a drain of the third transistor is electrically connected to the output node, and a source of the third transistor is electrically connected to the ground. ### Claim 4 (depends on 3) The driving circuit of claim 3, wherein the outputs of the switching circuit are respectively connected electrically to gates of the first transistor, the second transistor and the third transistor. ### Claim 5 (depends on 1) The driving circuit of claim 1, wherein the first transistor, the second transistor and the third transistor comprise metal-oxide-semiconductor transistors. ### Claim 6 (depends on 1) The driving circuit of claim 1, wherein the first voltage regulator and the second voltage regulator comprise low-dropout regulators. ### Claim 7 (depends on 1) The driving circuit of claim 1, wherein only one of the first transistor, the second transistor and the third transistor is turned on at a time by the switching circuit. ### Claim 8 (depends on 1) The driving circuit of claim 1, wherein the switching circuit comprises a binary decoder. ### Claim 9 (depends on 1) The driving circuit of claim 1, further comprising: a lookup table that stores a sequence of control codes provided to the controller for consecutively controlling the switching circuit. ### Claim 10 (depends on 1) The driving circuit of claim 1, further comprising: a register that stores numbers representing supply voltages to be read by the controller to correspondingly control the first voltage regulator and the second voltage regulator. ### Claim 11 (depends on 1) The driving circuit of claim 1, wherein the second voltage regulator switchably provides one of a plurality of negative supply voltages to the first negative voltage node. ### Claim 12 (depends on 11) The driving circuit of claim 11, further comprising: a fourth transistor and a fifth transistor electrically connected in series between a second positive voltage node and a second negative voltage node, the fourth transistor and the fifth transistor being interconnected at the output node; a third voltage regulator that switchably provides one of the plurality of positive supply voltages to the second positive voltage node; and a fourth voltage regulator that provides one of the plurality of negative supply voltages to the second negative voltage node. ### Claim 13 (depends on 12) The driving circuit of claim 12, wherein while the first voltage regulator provides one of the positive supply voltages to the first positive voltage node for generating a current drive voltage at the output node, the third voltage regulator provides another of the positive supply voltages to the second positive voltage node to prepare for generating a next drive voltage at the output node. ### Claim 14 (depends on 12) The driving circuit of claim 12, wherein while the second voltage regulator provides one of the negative supply voltages to the first negative voltage node for generating a current drive voltage at the output node, the fourth voltage regulator provides another of the negative supply voltages to the second negative voltage node to prepare for generating a next drive voltage at the output node. ### Claim 15 (depends on 12) The driving circuit of claim 12, wherein the fourth transistor has the first type and the fifth transistor has the second type. ### Claim 16 (depends on 15) The driving circuit of claim 15, wherein a source of the fourth transistor is electrically connected to the second positive voltage node, a drain of the fourth transistor is electrically connected to a drain of the fifth transistor at the output node, and a source of the fifth transistor is electrically connected to the second negative voltage node. ### Claim 17 (depends on 16) The driving circuit of claim 16, wherein the outputs of the switching circuit are respectively connected electrically to gates of the fourth transistor and the fifth transistor. ### Claim 18 (depends on 12) The driving circuit of claim 12, wherein the fourth transistor and the fifth transistor comprise metal-oxide-semiconductor transistors. ### Claim 19 (depends on 12) The driving circuit of claim 12, wherein the third voltage regulator and the fourth voltage regulator comprise low-dropout regulators. ### Claim 20 (depends on 12) The driving circuit of claim 12, wherein only one of the first transistor, the second transistor, the third transistor, the fourth transistor and the fifth transistor is turned on at a time by the switching circuit.