# US 10,503,311 B2 · System and method for regulating voltages in a display device having an integrated sensing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,503,311 B2 - Document ID: US10503311B2 - Status: Granted - Kind: B2 - Application number: 15/865,785 - Filed: 2018-01-09 - Published: 2019-04-25 - Granted: 2019-12-10 - Earliest claimed: 2017-10-24 - Assignees: Synaptics Incorporated - Applicants: Synaptics Incorporated - Inventors: Chunbo Liu; Koji Kishi; Zheming Li; Wenwei Yang - Web page: https://patentgrep.com/patent/US10503311B2 ## CPC - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - H02M 3/07: using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps} - H02M 1/0025: {Arrangements for modifying reference values, feedback values or error values in the control loop of a converter} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract Embodiments herein provide a voltage regulation system comprising a charge pump a voltage regulator and a current regulator. The charge pump is configured to output a current signal to a capacitor. The voltage regulator is configured to sample an output of the capacitor, and compare the sampled voltage to a target voltage to generate a control signal. The current regulator is configured to sample a portion of the output current based on the control signal and regulate the current signal outputted by the charge pump. ## Claims ### Claim 1 A voltage regulation system comprising: a charge pump configured to output a current signal to a capacitor, wherein the capacitor is modulated producing a modulated voltage signal; a voltage regulator coupled to an output of the capacitor and configured: to sample the modulated voltage signal generating a sampled voltage, compare the sampled voltage to a target voltage, and generate a first control signal based on the comparison; and a current regulator coupled to the voltage regulator and the charge pump and configured to sample at least a portion of the current signal and regulate the current signal based at least in part on the first control signal, wherein the current regulator comprises: a current comparator configured to compare the sampled current to a first threshold value and a second threshold value, wherein the first threshold value is greater than the second threshold value; and a counter configured to increase a count value when the sampled current satisfies the first threshold value and decrease the count value when the sampled current satisfies the second threshold value, wherein the current regulator is configured to output a current control signal indicating an increase of current of the current signal when the count value satisfies a first count threshold and a second current control signal indicating a decrease of the current of the current signal when the count value satisfies a second count threshold. ### Claim 2 (depends on 1) The voltage regulation system of claim 1, wherein the voltage regulator comprises a sampler configured to sample the modulated voltage signal and an error amplifier configured to compare the sampled voltage to the target voltage. ### Claim 3 (depends on 1) The voltage regulation system of claim 1, wherein regulating the current signal comprises one of providing an indication to increase current of the current signal and providing an indication to decrease the current of the current signal. ### Claim 4 (depends on 1) The voltage regulation system of claim 1, wherein the voltage regulator is configured to sample the modulated voltage signal at a first rate and the current regulator is configured to sample the current signal at a second rate, wherein the first rate is greater than the second rate. ### Claim 5 (depends on 1) The voltage regulation system of claim 1, wherein the modulated voltage signal corresponds to a capacitive sensing signal driven onto a one or more sensing electrodes for capacitive sensing, and wherein the voltage regulator is configured to sample the modulated voltage signal at a first rate and the current regulator is configured to sample the current signal at a second rate, wherein the first rate is based on a sensing cycle rate of the capacitive sensing signal and the second rate is based on a burst rate of the capacitive sensing signal. ### Claim 6 (depends on 2) The voltage regulation system of claim 2 further comprises a current control circuitry coupled between the voltage regulator and the current regulator, wherein the current control circuitry is configured to control a regulation current of the current regulator. ### Claim 7 (depends on 6) The voltage regulation system of claim 6, wherein when said sampled voltage is less than the target voltage the current control circuitry initiates the regulation current. ### Claim 8 (depends on 6) The voltage regulation system of claim 6, wherein the current control circuitry comprises a transistor. ### Claim 9 A display driver for a display device comprising: a capacitor configured to be coupled to at least one gate line of the display device, wherein the capacitor is modulated outputting a modulated voltage signal; and a voltage regulation system coupled the output of the capacitor, the voltage regulation system comprising: a charge pump configured to output a current signal to the capacitor; a voltage regulator configured to: sample the modulated voltage signal at a first rate generating a sampled voltage, compare the sampled voltage to a target voltage and generate a first control signal based on the comparison; and a current regulator coupled to the voltage regulator and the charge pump and configured to: sample the current signal at a second rate, wherein the first rate differs from the second rate; and regulate the current signal based at least in part on the first control signal. ### Claim 10 (depends on 9) The display driver of claim 9, wherein the voltage regulator comprises a sampler configured to sample the modulated voltage signal and an error amplifier configured to compare the sampled voltage to the target voltage. ### Claim 11 (depends on 9) The display driver of claim 9, wherein the voltage regulation system further comprises a control mechanism coupled between the voltage regulator and the current regulator, wherein the control mechanism is configured to control a regulation current of the current regulator. ### Claim 12 (depends on 9) The display driver of claim 9, wherein regulating the current signal comprises one of providing an indication to increase current of the current signal and providing an indication to decrease the current of the current signal provided by the charge pump. ### Claim 13 (depends on 9) The display driver of claim 9, wherein the current regulator configured to sample at least a portion of the current signal and comprises: a current comparator configured to compare the sampled current to a first threshold value and a second threshold value, wherein the first threshold value is greater than the second threshold value; and a counter configured to increase a count value when t the sampled current satisfies the first threshold value and decrease the count value when the sampled current satisfies the second threshold value, wherein the current regulator is configured to output a current control signal indicating an increase of current of the current signal when the count value satisfies a first count threshold and a second current control signal indicating a decrease of the current of the current signal when the count value satisfies a second count threshold. ### Claim 14 (depends on 9) The display driver of claim 9, wherein the modulated voltage signal corresponds to a modulated sensing signal driven by a sensor driver onto a one or more sensing electrodes for capacitive sensing. ### Claim 15 A method for regulating a voltage for a display driver, said method comprises: sampling a modulated voltage signal at a first rate to generate a sampled voltage, wherein the modulated voltage signal corresponds to a capacitive sensing signal driven onto one or more sensing electrodes for capacitive sensing, wherein the first rate is based on a sensing cycle rate of the capacitive sensing signal, wherein an output of a capacitor is modulated to produce the modulated voltage signal and wherein the capacitor is driven by a current signal of a charge pump; comparing the sampled voltage to a target voltage to determine if the sampled voltage is one of greater than and less than the target voltage; sampling the current signal at a second rate, wherein the second rate is based on a burst rate of the capacitive sensing signal; and regulating the current signal based on a determination that the sampled voltage is less than the target voltage. ### Claim 16 (depends on 15) The method of claim 15, wherein regulating the current signal comprises one of providing an indication to increase current of the current signal and providing an indication to decrease the current of the current signal. ### Claim 17 (depends on 15) The method of claim 15 wherein regulating the current signal comprises: comparing a sample of a portion of the current signal to a first threshold value and a second threshold value, wherein the first threshold value is greater than the second threshold value; increasing a count value when the sampled current satisfies the first threshold value; decreasing the count value when the sampled current satisfies the second threshold value; and providing a first indication indicating an increase of current of the current signal when the count value satisfies a first count threshold and a second indication indicating a decrease of the current of the current signal when the count value satisfies a second count threshold. ### Claim 18 (depends on 15) The method of claim 15, further comprising sampling the modulated voltage signal at a first rate and the sampling the current signal at a second rate, wherein the first rate is greater than the second rate.