BR112012016743A2 - "sistema de luz de fundo de led" - Google Patents

"sistema de luz de fundo de led"

Info

Publication number
BR112012016743A2
BR112012016743A2 BR112012016743A BR112012016743A BR112012016743A2 BR 112012016743 A2 BR112012016743 A2 BR 112012016743A2 BR 112012016743 A BR112012016743 A BR 112012016743A BR 112012016743 A BR112012016743 A BR 112012016743A BR 112012016743 A2 BR112012016743 A2 BR 112012016743A2
Authority
BR
Brazil
Prior art keywords
pulse width
frequency
width modulation
display
led backlight
Prior art date
Application number
BR112012016743A
Other languages
English (en)
Other versions
BR112012016743B1 (pt
Inventor
Kim Floriano
A Yoshimoto Mark
m thompson Paul
Original Assignee
Apple Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Apple Inc filed Critical Apple Inc
Publication of BR112012016743A2 publication Critical patent/BR112012016743A2/pt
Publication of BR112012016743B1 publication Critical patent/BR112012016743B1/pt

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

patente de invenção: "sistema de luz de fundo de led" a invenção refere-se a um método e sistema para modificar a frequência de modulação de largura de pulso para controlar a intensidade de iluminação de luz de fundo de um display de cristal líquido (14). a frequência de modulação de largura de pulso modificada pode ser selecionada para reduzir a distorção no display (14) enquanto permitindo uma ampla faixa de ajustes de diminuição de brilho para o display (14). um sinal de modulação de largura de pulso (95) pode também ser deslocado em fase de modo que uma cadeia de fontes de luz (110-115) possa ser sequencialmente ativada para gerar uma frequência efetiva maior do que aquela da frequência do sinal de modulação de largura de pulso (95).
BR112012016743-0A 2010-01-06 2010-08-31 Dispositivo eletrônico e método para prover iluminação para um display BR112012016743B1 (pt)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US12/683,414 2010-01-06
US12/683,414 US8907884B2 (en) 2010-01-06 2010-01-06 LED backlight system
PCT/US2010/047311 WO2011084188A1 (en) 2010-01-06 2010-08-31 Led backlight system

Publications (2)

Publication Number Publication Date
BR112012016743A2 true BR112012016743A2 (pt) 2018-06-12
BR112012016743B1 BR112012016743B1 (pt) 2021-04-06

Family

ID=43034366

Family Applications (1)

Application Number Title Priority Date Filing Date
BR112012016743-0A BR112012016743B1 (pt) 2010-01-06 2010-08-31 Dispositivo eletrônico e método para prover iluminação para um display

Country Status (9)

Country Link
US (1) US8907884B2 (pt)
EP (1) EP2522007A1 (pt)
JP (1) JP5576505B2 (pt)
KR (1) KR20120097417A (pt)
CN (1) CN102216975B (pt)
BR (1) BR112012016743B1 (pt)
MX (1) MX2012007978A (pt)
TW (1) TWI450000B (pt)
WO (1) WO2011084188A1 (pt)

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120049760A1 (en) * 2010-08-31 2012-03-01 Control Products Corporation Apparatus and methods for dimming illumination devices
US9524679B2 (en) 2010-09-21 2016-12-20 Apple Inc. Backlight system for a display
US20120112660A1 (en) * 2010-11-05 2012-05-10 Himax Analogic, Inc. LED Circuit Having LED Driving Circuit with Smooth Transient Mechanism and Operation Method of the Same
KR20120082206A (ko) * 2011-01-13 2012-07-23 삼성모바일디스플레이주식회사 광원 구동 회로 및 이를 포함하는 표시 장치
US8988005B2 (en) * 2011-02-17 2015-03-24 Cooledge Lighting Inc. Illumination control through selective activation and de-activation of lighting elements
US8456093B2 (en) * 2011-03-25 2013-06-04 Texas Instruments Incorporated Apparatus and method for LED array control
CN103152899B (zh) * 2011-12-06 2015-04-01 曙光信息产业股份有限公司 流水灯光实现方法和装置、以及发光设备
US8742695B2 (en) 2012-05-14 2014-06-03 Usai, Llc Lighting control system and method
US8581520B1 (en) * 2012-05-14 2013-11-12 Usai, Llc Lighting system having a dimming color simulating an incandescent light
KR102130396B1 (ko) 2012-11-29 2020-08-06 삼성디스플레이 주식회사 백라이트 유닛 및 그것을 포함하는 표시 장치
US9433066B2 (en) * 2012-11-30 2016-08-30 Scott Burkhart Music synchronized light modulator
JP2014186972A (ja) * 2013-03-25 2014-10-02 Yamaha Corp 制御信号生成装置及び音響信号処理装置
CN103280189A (zh) 2013-05-17 2013-09-04 深圳市华星光电技术有限公司 一种led调光电路
KR102135912B1 (ko) * 2013-09-23 2020-07-20 엘지디스플레이 주식회사 백 라이트 유닛과 이를 이용한 액정 표시장치 및 그의 구동방법
JP6245952B2 (ja) * 2013-11-12 2017-12-13 コイト電工株式会社 Ｌｅｄ駆動回路及びｌｅｄ照明装置
US10278243B2 (en) 2014-03-06 2019-04-30 Seoul Semiconductor Co., Ltd. Backlight module with MJT LED and backlight unit including the same
KR102364160B1 (ko) 2014-03-06 2022-02-21 서울반도체 주식회사 Mjt led를 이용한 백라이트 모듈 및 이를 포함하는 백라이트 유닛
TWI561118B (en) 2014-08-13 2016-12-01 Ind Tech Res Inst Dimming system and operating method thereof
US9953581B2 (en) 2015-02-20 2018-04-24 Apple Inc. Pulse width modulation (PWM) driving scheme and bezel reduction
KR102415744B1 (ko) * 2015-06-03 2022-07-04 삼성전자주식회사 인접한 두 휘도 단계 사이에 새로운 휘도 단계를 생성하는 방법 및 전자 장치
JP6784967B2 (ja) * 2015-06-09 2020-11-18 天馬微電子有限公司 Ｌｅｄバックライト駆動回路及びその駆動方法、並びに液晶表示装置
CN104934012B (zh) * 2015-07-20 2018-01-09 深圳市华星光电技术有限公司 一种多时序生成电路及液晶显示器
KR102619139B1 (ko) * 2016-11-30 2023-12-27 엘지디스플레이 주식회사 전계 발광 표시 장치
US10076021B1 (en) * 2017-04-12 2018-09-11 Intel Corporation Method, device and system for facilitating heat dissipation from a circuit assembly
US10909165B2 (en) 2017-06-20 2021-02-02 Red Hat, Inc. Sharing filesystems between containers
CN108200279B (zh) * 2017-12-28 2020-09-08 北京小米移动软件有限公司 背光调节方法、装置和设备
CN110062492B (zh) * 2018-01-19 2021-11-19 朗德万斯公司 具有降低的可听噪声的pwm调光
US11710464B2 (en) 2018-05-03 2023-07-25 Darfon Electronics Corp. Display device and backlight apparatus thereof
TWI642979B (zh) * 2018-05-03 2018-12-01 達方電子股份有限公司 背光裝置
US11116055B2 (en) 2018-12-27 2021-09-07 Lumileds Llc Time slicing method for multi-channel color tuning using a single current source input
CN110379378B (zh) * 2019-07-29 2021-04-02 京东方科技集团股份有限公司 背光驱动电路、显示装置及背光驱动方法
US11102860B2 (en) * 2019-08-01 2021-08-24 Rockwell Collins, Inc. Backlit display dimming system and method
CN111028795A (zh) * 2019-12-03 2020-04-17 Tcl华星光电技术有限公司 亮度调节方法、调光装置及显示面板
CN111681549B (zh) * 2020-06-16 2022-03-18 昆山国显光电有限公司 阵列基板和显示面板
CN113129845B (zh) * 2021-04-12 2022-07-29 Tcl华星光电技术有限公司 一种背光驱动方法及显示面板
TWI812055B (zh) * 2021-10-19 2023-08-11 瑞鼎科技股份有限公司 迷你發光二極體背光系統及迷你發光二極體背光區域調光的控制方法

Family Cites Families (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5184117A (en) * 1989-06-28 1993-02-02 Zenith Data Systems Corporation Fluorescent backlight flicker control in an LCD display
JPH10111487A (ja) 1996-10-07 1998-04-28 Yokogawa Electric Corp Ｌｃｄバックライト駆動回路
DE10146996A1 (de) 2001-09-25 2003-04-30 Gerd Reime Schaltung mit einer optoeleketronischen Anzeigeeinhalt
US6841947B2 (en) * 2002-05-14 2005-01-11 Garmin At, Inc. Systems and methods for controlling brightness of an avionics display
US7233309B2 (en) * 2003-09-30 2007-06-19 Intel Corporation Coordinating backlight frequency and refresh rate in a panel display
WO2007035883A2 (en) * 2005-09-20 2007-03-29 California Micro Devices Corporation Driving parallel strings of series connected leds
US20070165002A1 (en) 2006-01-13 2007-07-19 Sony Ericsson Mobile Communications Ab User interface for an electronic device
WO2007091345A1 (ja) * 2006-02-10 2007-08-16 Sharp Kabushiki Kaisha バックライト装置、表示装置、及びテレビ受信機
KR20070109532A (ko) * 2006-05-11 2007-11-15 삼성전자주식회사 백라이트와 백라이트 구동 방법 및 이를 포함한액정표시장치
JP4993181B2 (ja) 2006-09-10 2012-08-08 アルパイン株式会社 Ｌｅｄ駆動装置
US7948468B2 (en) * 2007-02-23 2011-05-24 The Regents Of The University Of Colorado Systems and methods for driving multiple solid-state light sources
US8330393B2 (en) 2007-04-20 2012-12-11 Analog Devices, Inc. System for time-sequential LED-string excitation
TW200844931A (en) 2007-05-14 2008-11-16 Chunghwa Picture Tubes Ltd Method for controlling backlight apparatus and luminance control circuit thereof
WO2008149267A1 (en) 2007-06-06 2008-12-11 Koninklijke Philips Electronics N.V. Method and apparatus for driving light emitting elements for projection of images
JP2009003270A (ja) 2007-06-22 2009-01-08 Toshiba Matsushita Display Technology Co Ltd 液晶表示装置、及び液晶表示装置の駆動方法
KR101517355B1 (ko) 2007-07-16 2015-05-04 코닌클리케 필립스 엔.브이. 광원 구동
JP2009032497A (ja) 2007-07-26 2009-02-12 Denso Corp バックライト制御装置
US8405321B2 (en) * 2007-07-26 2013-03-26 Rohm Co., Ltd. Drive unit, smoothing circuit, DC/DC converter
JP2009042302A (ja) 2007-08-06 2009-02-26 Sony Corp 面状光源装置及び液晶表示装置組立体
US8847874B2 (en) 2007-08-23 2014-09-30 Dell Products L.P. System and method for sequential driving of information handling system display backlight LED strings
DE102007044476A1 (de) 2007-09-18 2009-03-19 Osram Gesellschaft mit beschränkter Haftung Beleuchtungseinheit und Verfahren zur Ansteuerung der Beleuchtungseinheit
EP2048648B1 (en) 2007-10-11 2013-02-13 LG Display Co., Ltd. Liquid crystal display device including backlight unit and method of driving the same
KR101282997B1 (ko) * 2007-10-11 2013-07-05 엘지디스플레이 주식회사 액정표시장치와 그 액정표시장치의 백라이트 구동방법
JP5344809B2 (ja) * 2007-11-21 2013-11-20 アルパイン株式会社 バックライト装置
KR20090076330A (ko) 2008-01-08 2009-07-13 주식회사 케이이씨 시간 분할 다중 출력 직류-직류 컨버터를 갖는 발광 장치및 전원 장치
US20090187925A1 (en) 2008-01-17 2009-07-23 Delta Electronic Inc. Driver that efficiently regulates current in a plurality of LED strings
JP4994253B2 (ja) 2008-01-24 2012-08-08 株式会社ジャパンディスプレイイースト 液晶表示装置
US7880404B2 (en) 2008-01-25 2011-02-01 Micrel, Inc. Controlling current through serial LEDs using a low voltage transistor when using a high voltage driver
US20090225020A1 (en) 2008-03-07 2009-09-10 O2Micro, Inc. Backlight controller for driving light sources
US7843148B2 (en) 2008-04-08 2010-11-30 Micrel, Inc. Driving multiple parallel LEDs with reduced power supply ripple
EP2108994A1 (en) 2008-04-09 2009-10-14 Barco NV Display apparatus and method for controlling light output of the display apparatus
CN101610621A (zh) 2008-06-17 2009-12-23 热速得控股股份有限公司 切换式发光二极管驱动电路
KR20100006320A (ko) 2008-07-09 2010-01-19 엘지디스플레이 주식회사 백라이트 유닛의 광원 구동장치 및 방법

Also Published As

Publication number Publication date
CN102216975A (zh) 2011-10-12
KR20120097417A (ko) 2012-09-03
TW201131261A (en) 2011-09-16
WO2011084188A1 (en) 2011-07-14
US8907884B2 (en) 2014-12-09
EP2522007A1 (en) 2012-11-14
JP5576505B2 (ja) 2014-08-20
MX2012007978A (es) 2012-11-23
CN102216975B (zh) 2015-06-17
US20110164069A1 (en) 2011-07-07
TWI450000B (zh) 2014-08-21
BR112012016743B1 (pt) 2021-04-06
JP2013516741A (ja) 2013-05-13

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B06F Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]
B06U Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]
B07A Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]
B09A Decision: intention to grant [chapter 9.1 patent gazette]
B16A Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]

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