# US 9,520,099 B2 · Converter and display apparatus having the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,099 B2 - Document ID: US9520099B2 - Status: Granted - Kind: B2 - Application number: 14/572,682 - Filed: 2014-12-16 - Published: 2015-06-18 - Granted: 2016-12-13 - Earliest claimed: 2013-12-17 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., LTD. - Inventors: Bum Lee; Dong-In Kim; Yeon-Sun Na; Hyun-Seok Hong - Web page: https://patentgrep.com/patent/US9520099B2 ## CPC - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - G09G 3/3611: {Control of matrices with row and column drivers} - G09G 2330/02: Details of power systems and of start or stop of display operation - H02M 1/0032: {Control circuits allowing low power mode operation, e.g. in standby mode} - H02M 1/0048: {Circuits or arrangements for reducing losses (using snubbers H02M1/34)} - 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 - 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 converter includes a feedback part, a pulse width modulation (PWM) controller and a PWM generator. The feedback part is configured to output a feedback signal based on a driving voltage. The PWM controller is configured to output a PWM control signal based on the feedback signal and a first compensation signal. The PWM generator is configured to control the driving voltage based on the PWM control signal. The first compensation signal is determined according to an occurrence of a predetermined pattern of an input image data. ## Claims ### Claim 1 A converter comprising: a feedback part configured to output a feedback signal based on a driving voltage; a pulse width modulation (PWM) controller configured to output a PWM control signal based on the feedback signal and a first compensation signal, the first compensation signal determined according to an occurrence of a predetermined pattern of an input image data; and a PWM generator configured to control the driving voltage based on the PWM control signal. ### Claim 2 (depends on 1) The converter of claim 1, wherein the PWM controller is configured to output the PWM control signal based on the feedback signal, the first compensation signal and a second compensation signal, and the second compensation signal is determined according to a temperature of a driving part. ### Claim 3 (depends on 1) The converter of claim 1, wherein the PWM controller is configured to output the PWM control signal based on the feedback signal, the first compensation signal and a second compensation signal, and the second compensation signal is determined according to a temperature of a display panel. ### Claim 4 The converter of claim I, further comprising an input terminal, an output terminal, an inductor, a switching element and a diode, wherein the input terminal is configured to receive an input voltage, the output terminal is configured to output the driving voltage, a first end of the inductor is electrically connected to the input terminal and the inductor is configured to charge the input voltage, a gate electrode of the switching element is connected to the PWM generator, a source electrode of the switching element is connected to a ground, and a drain electrode of the switching element is connected to a second end of the inductor, and an anode of the diode is connected to the second end of the inductor and the drain electrode of the switching element, and a cathode of the diode is connected to the output terminal. ### Claim 5 (depends on 4) The converter of claim 4, further comprising a first resistor connected to the output terminal and a second resistor connected to the first resistor in series, wherein the feedback part is configured to output the feedback signal based on a voltage applied between the first resistor and the second resistor. ### Claim 6 (depends on 4) The converter of claim 4, further comprising a current detector connected to the drain electrode of the switching element, wherein the current detector is configured to detect a current applied to the drain electrode of the switching element, and to output a third compensation signal based on the current applied to the drain electrode, and the PWM controller is configured to output the PWM control signal based on the feedback signal, the first compensation signal and the third compensation signal. ### Claim 7 A display apparatus comprising: a display panel configured to display an image; a driving part configured to drive the display panel; an image pattern detector configured to output a first compensation signal based on an input image data; and a converter configured to output a driving voltage to the driving part, and comprising: a feedback part configured to output a feedback signal based on the driving voltage; a pulse width modulation (PWM) controller configured to output a PWM control signal based on the feedback signal and the first compensation signal, the first compensation signal determined according to an occurrence of a predetermined pattern of the input image data; and a PWM generator configured to control the driving voltage based on the PWM control signal. ### Claim 8 (depends on 7) The display apparatus of claim 7, further comprising a temperature detector configured to output a second compensation signal based on a temperature of the driving part, and wherein the PWM controller is configured to output the PWM control signal based on the feedback signal, the first compensation signal and the second compensation signal. ### Claim 9 (depends on 8) The display apparatus of claim 8, wherein the driving part comprises a gate driver configured to output a gate signal to a gate line of the display panel, and the temperature detector is configured to output the second compensation signal based on a temperature of the gate driver. ### Claim 10 (depends on 8) The display apparatus of claim 8, wherein the driving part comprises a data driver configured to output a data voltage to a data line of the display panel, and the temperature detector is configured to output the second compensation signal based on a temperature of the data driver. ### Claim 11 (depends on 8) The display apparatus of claim 8, wherein the temperature detector comprises one of a negative temperature coefficient (“NTC”) thermistor, a positive temperature coefficient (“PTC”) thermistor, a critical temperature resistor (“CTR”) and a Seebeck element, and a resistance of the negative temperature coefficient (“NTC”) thermistor decreases when the ambient temperature increases, a resistance of the positive temperature coefficient (“PTC”) thermistor increases when the ambient temperature increases, a resistance of the critical temperature resistor (“CTR”) significantly changes at approximately a preset temperature, and the Seebeck element generates an electromotive force according to a temperature difference. ### Claim 12 (depends on 7) The display apparatus of claim 7, further comprising a temperature detector configured to output a second compensation signal based on a temperature of the display panel, and wherein the PWM controller is configured to output the PWM control signal based on the feedback signal, the first compensation signal and the second compensation signal. ### Claim 13 (depends on 7) The display apparatus of claim 7, wherein the converter further comprises an input terminal, an output terminal, an inductor, a switching element and a diode, wherein the input terminal is configured to receive an input voltage, the output terminal is configured to output the driving voltage, a first end of the inductor is electrically connected to the input terminal and the inductor is configured to charge the input voltage, a gate electrode of the switching element is connected to the PWM generator, a source electrode of the switching element is connected to a ground, and a drain electrode of the switching element is connected to a second end of the inductor, and an anode of the diode is connected to the second end of the inductor and the drain electrode of the switching element, and a cathode of the diode is connected to the output terminal. ### Claim 14 (depends on 13) The display apparatus of claim 13, wherein the converter further comprises a current detector connected to the drain electrode of the switching element, the current detector is configured to detect a current applied to the drain electrode of the switching element, and to output a third compensation signal based on the current applied to the drain electrode, and the PWM controller is configured to output the PWM control signal based on the feedback signal, the first compensation signal and the third compensation signal. ### Claim 15 (depends on 13) The display apparatus of claim 13, wherein the converter further comprises a first resistor connected to the output terminal and a second resistor connected to the first resistor in series, and the feedback part is configured to output the feedback signal based on a voltage applied between the first resistor and the second resistor. ### Claim 16 (depends on 7) The display apparatus of claim 7, wherein the PWM controller comprises a look-up table having values corresponding to the PWM control signal, and the PWM controller is configured to generate the PWM control signal according to the stored values of the look-up table. ### Claim 17 (depends on 16) The display apparatus of claim 16, wherein the PWM controller further comprises a memory part configured to store the look-up table. ### Claim 18 (depends on 7) The display apparatus of claim 7, wherein the predetermined pattern comprises a pattern generating a crosstalk when corresponding voltages are applied to the display panel and a pattern generating a power ripple when corresponding voltages are applied to the display panel. ### Claim 19 (depends on 7) The display apparatus of claim 7, further comprising a backlight assembly configured to provide light to the display panel, wherein the driving voltage comprises a first driving voltage to drive the driving part and a second driving voltage to drive the backlight assembly. ### Claim 20 (depends on 7) The display apparatus of claim 7, further comprising a timing controller configured to receive the input image data and an input control signal from an external apparatus, to generate a control signal based on the input image data and the input control signal, and to output the control signal to the driving part, wherein the image pattern detector is disposed in the timing controller.