# US 10,310,589 B2 · Display device including power control device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,310,589 B2 - Document ID: US10310589B2 - Status: Granted - Kind: B2 - Application number: 15/408,015 - Filed: 2017-01-17 - Published: 2017-05-04 - Granted: 2019-06-04 - Earliest claimed: 2012-11-19 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Soon-Gi Kwon; Sung-Cheon Park - Web page: https://patentgrep.com/patent/US10310589B2 ## CPC - G06F 1/3287: by switching off individual functional units in the computer system - G06F 1/30: Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations (for resetting only G06F1/24) - G06F 1/3265: {Power saving in display device} - G06F 1/3296: by lowering the supply or operating voltage - G09G 3/2092: {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)} - H02M 1/32: Means for protecting converters other than automatic disconnection - H02M 3/158: including plural semiconductor devices as final control devices for a single load - G09G 2330/02: Details of power systems and of start or stop of display operation - H02M 1/0025: {Arrangements for modifying reference values, feedback values or error values in the control loop of a converter} - H02M 3/1588: {comprising at least one synchronous rectifier element (H02M3/1582, H02M3/1584 take precedence)} - Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - 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) - 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) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A power controller includes an inductor coupled to an input terminal to which an input voltage is input, a first switch coupled between the inductor and a first power source voltage output terminal, a second switch coupled between the inductor and a ground, a switch controller controlling a voltage output to the first power source voltage output terminal by controlling duties of the first and second switches according to a feedback voltage input to a feedback terminal corresponding to a voltage output to the first power source voltage output terminal, and a diode coupled between the first power source voltage output terminal and the feedback terminal, and preventing a voltage of the first power source voltage output terminal from increasing higher than a breakdown voltage of the first and second switches. ## Claims ### Claim 1 A display device, comprising: a plurality of pixels; and a power controller to supply a first power source voltage and a second power source voltage to the plurality of pixels, wherein the power controller outputs the first power source voltage to a first power source voltage output terminal by converting an input voltage, controls the first power source voltage by controlling a duty of a switch according to a feedback voltage input through a feedback voltage corresponding to the first power source voltage, and prevents the first power source voltage from increasing higher than a breakdown voltage of the switch using a diode coupled between the first power source voltage output terminal and a feedback terminal, wherein: the power controller includes an inductor coupled to an input terminal to which the input voltage is input, and the switch includes: a first switch coupled between the inductor and the first power source voltage output terminal, and a second switch coupled between the inductor and a ground. ### Claim 2 (depends on 1) The display device of claim 1, wherein a threshold voltage of the diode corresponds to a voltage difference between the first power source voltage and the feedback voltage when the first power source voltage is lower by a predetermined level than a breakdown voltage of the first and second switches. ### Claim 3 (depends on 2) The display device of claim 2, wherein, when the voltage difference between the first power source voltage and the feedback voltage reaches the threshold voltage of the diode, the feedback terminal is coupled to the first power source voltage output terminal through the diode. ### Claim 4 (depends on 2) The display device of claim 2, wherein the power controller further includes a first resistor and a second resistor coupled in series between the feedback terminal and a ground and dividing a voltage that corresponds to a voltage difference between the feedback voltage and a ground voltage. ### Claim 5 (depends on 4) The display device of claim 4, wherein the power controller further includes a second differential amplifier including a first input terminal to which a voltage divided between the first resistor and the second resistor is input, a second input terminal to which a second reference voltage is input, and an output terminal outputting a voltage error signal that corresponds to a voltage difference between the divided voltage and the second reference voltage. ### Claim 6 (depends on 5) The display device of claim 5, wherein the power controller further includes a third differential amplifier including a first input terminal to which a first pulse width control signal is input, a second input terminal to which the voltage error signal is input, and an output terminal outputting a second pulse width control signal that corresponds to a voltage difference between the first pulse width control signal and the voltage error signal. ### Claim 7 (depends on 6) The display device of claim 6, wherein the power controller controls duties of the first and second switches according to the second pulse width control signal. ### Claim 8 (depends on 1) The display device of claim 1, wherein the power controller further includes a first differential amplifier including a first input terminal to which the feedback voltage is input, a second input terminal to which a first reference voltage is input, and an output terminal outputting an over-voltage protection signal that corresponds to a voltage difference between the feedback voltage and the first reference voltage. ### Claim 9 (depends on 8) The display device of claim 8, wherein the power controller further includes a third switch coupled between the first switch and the first power source voltage output terminal and controls turning on and off of the third switch according to the over-voltage protection signal. ### Claim 10 (depends on 1) The display device of claim 1, wherein the power controller further includes a first capacitor including: a first electrode coupled to the first power source voltage output terminal, and a second electrode coupled to a ground. ### Claim 11 (depends on 1) The display device of claim 1, wherein the power controller further includes a second capacitor including: a first electrode coupled to a second power source voltage terminal having the second power source voltage, and a second electrode coupled to a ground.