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1. WO2018126494 - LED BACKLIGHT DRIVING CIRCUIT AND LIQUID CRYSTAL DISPLAY

Publication Number WO/2018/126494
Publication Date 12.07.2018
International Application No. PCT/CN2017/071297
International Filing Date 16.01.2017
IPC
G09G 3/34 2006.01
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for 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
34by control of light from an independent source
H05B 37/02 2006.01
HELECTRICITY
05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
37Circuit arrangements for electric light sources in general
02Controlling
G02F 1/13357 2006.01
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements
1335Structural association of cells with optical devices, e.g. polarisers or reflectors
13357Illuminating devices
CPC
F21Y 2115/10
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
21LIGHTING
YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
2115Light-generating elements of semiconductor light sources
10Light-emitting diodes [LED]
G02F 1/133603
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour 
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements; ; Manufacturing methods
1335Structural association of cells with optical devices, e.g. polarisers or reflectors
1336Illuminating devices
133602Direct backlight
133603with LEDs
G09G 2310/0264
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2310Command of the display device
02Addressing, scanning or driving the display screen or processing steps related thereto
0264Details of driving circuits
G09G 2320/0626
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
06Adjustment of display parameters
0626for control of overall brightness
G09G 2320/064
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
06Adjustment of display parameters
0626for control of overall brightness
064by time modulation of the brightness of the illumination source
G09G 3/32
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for 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
22using controlled light sources
30using electroluminescent panels
32semiconductive, e.g. using light-emitting diodes [LED]
Applicants
  • 深圳市华星光电技术有限公司 SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD. [CN]/[CN]
Inventors
  • 李文东 LI, Wendong
Agents
  • 广州三环专利商标代理有限公司 SCIHEAD IP LAW FIRM
Priority Data
201710004506304.01.2017CN
Publication Language Chinese (ZH)
Filing Language Chinese (ZH)
Designated States
Title
(EN) LED BACKLIGHT DRIVING CIRCUIT AND LIQUID CRYSTAL DISPLAY
(FR) CIRCUIT DE PILOTAGE DE RÉTROÉCLAIRAGE À DEL ET DISPOSITIF D'AFFICHAGE À CRISTAUX LIQUIDES
(ZH) 一种LED背光驱动电路及液晶显示器
Abstract
(EN)
An LED backlight driving circuit and a liquid crystal display, the LED backlight driving circuit comprising: a power source (110); an LED string, comprising at least one string of LED lamps, a positive end being electrically connected to the power source (110); a step-down circuit (200), electrically connected to the LED string; an LED controller (140), electrically connected to the step-down circuit (200). During a first period, the LED controller (140) controls the power source (110) to power the LED string and controls the step-down circuit (200) to store energy, and during a second period, the LED controller (140) controls the step-down circuit (200) to power the LED string. The LED backlight driving circuit provided with the step-down circuit (200) is energy-saving and not easily damaged, and the brightness of the LED lamps is balanced.
(FR)
L'invention concerne un circuit de pilotage de rétroéclairage à DEL et un dispositif d'affichage à cristaux liquides, le circuit de pilotage de rétroéclairage à DEL comportant : une source d'alimentation (110) ; une chaîne de DEL, comportant au moins une chaîne de lampes à DEL, une extrémité positive étant connectée électriquement à la source d'alimentation (110) ; un circuit abaisseur de tension (200), connecté électriquement à la chaîne de DEL ; un dispositif de commande de DEL (140), connecté électriquement au circuit abaisseur de tension (200). Au cours d'une première période, le dispositif de commande de DEL (140) commande la source d'alimentation (110) pour alimenter la chaîne de DEL et commande le circuit abaisseur de tension (200) pour stocker de l'énergie, et au cours d'une deuxième période, le dispositif de commande de DEL (140) commande le circuit abaisseur de tension (200) pour alimenter la chaîne de DEL. Le circuit de pilotage de rétroéclairage à DEL comportant le circuit abaisseur de tension (200) est économe en énergie et n'est pas facilement endommagé, et la luminosité des lampes à DEL est équilibrée.
(ZH)
一种LED背光驱动电路及液晶显示器,LED背光驱动电路包括:电源(110);LED串,包括至少一串LED灯,正端与电源(110)电连接;降压电路(200),与LED串电连接;LED控制器(140),与降压电路(200)电连接,在第一期间LED控制器(140)控制电源(110)供电给LED串并控制降压电路(200)进行储能,在第二期间LED控制器(140)控制降压电路(200)供电给LED串。具有降压电路(200)的LED背光驱动电路节能,不会轻易损坏,LED灯的亮度均衡。
Also published as
Latest bibliographic data on file with the International Bureau