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1. WO2013001622 - LED BACKLIGHT CONTROL CIRCUIT, METHOD FOR CONTROLLING SAME, AND LIQUID CRYSTAL MONITOR

Publication Number WO/2013/001622
Publication Date 03.01.2013
International Application No. PCT/JP2011/064911
International Filing Date 29.06.2011
IPC
G09G 3/36 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
36using liquid crystals
G02F 1/133 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
G09G 3/20 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
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
CPC
G09G 2330/02
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2330Aspects of power supply; Aspects of display protection and defect management
02Details of power systems and of start or stop of display operation
G09G 3/34
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
34by control of light from an independent source
G09G 3/342
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
34by control of light from an independent source
3406Control of illumination source
342using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
H05B 45/46
HELECTRICITY
05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
45Circuit arrangements for operating light emitting diodes [LED]
40Details of LED load circuits
44with an active control inside an LED matrix
46having LEDs disposed in parallel lines
Applicants
  • NECディスプレイソリューションズ株式会社 NEC Display Solutions, Ltd. [JP]/[JP] (AllExceptUS)
  • 中澤 琢哉 NAKAZAWA Takuya [JP]/[JP] (UsOnly)
Inventors
  • 中澤 琢哉 NAKAZAWA Takuya
Agents
  • 棚井 澄雄 TANAI Sumio
Priority Data
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) LED BACKLIGHT CONTROL CIRCUIT, METHOD FOR CONTROLLING SAME, AND LIQUID CRYSTAL MONITOR
(FR) CIRCUIT DE COMMANDE DE RÉTROÉCLAIRAGE LED, PROCÉDÉ POUR LE COMMANDER, ET MONITEUR A CRISTAUX LIQUIDES
(JA) LEDバックライト制御回路、その制御方法及び液晶モニタ
Abstract
(EN)
This LED backlight control circuit controls a drive current flowing in each of a plurality of LED arrays (14A, 14B, 14C) that constitute a backlight of a liquid crystal monitor. The LED backlight control circuit is provided with: a power supply circuit (13), which supplies a drive voltage to each of the LED arrays; a current changeover switch (15), which is provided between the LED arrays and the power supply circuit, and connects the power supply circuit to one of the LED arrays; and an LED backlight controller (12), which sequentially switches the changeover switch, and controls an output voltage of the power supply circuit such that a value of a current flowing in each of the LED arrays is equal to a set current value that has been previously set.
(FR)
L'invention concerne un circuit de commande de rétroéclairage LED, qui commande un courant de commande circulant dans chaque matrice de LED d'une pluralité de matrices de LED(14A, 14B, 14C) qui constituent un rétroéclairage d'un moniteur à cristaux liquides. Le circuit de commande de rétroéclairage LED comprend : un circuit d'alimentation (13) qui fournit une tension de commande à chacune des matrices de LED; un commutateur- inverseur de courant (15) disposé entre les matrices de LED et le circuit d'alimentation et qui relie le circuit d'alimentation à l'une des matrices de LED; et un dispositif de commande de rétroéclairage LED (12) qui commute séquentiellement le commutateur-inverseur et qui commande une tension de sortie du circuit d'alimentation de sorte qu'une valeur d'un courant circulant dans chacune des matrices de LED est égale à une valeur de courant réglée qui a été déterminée préalablement.
(JA)
 本発明のLEDバックライト制御回路は、液晶モニタのバックライトを構成する複数のLEDアレイ(14A,14B,14C)の各々に流れる駆動電流を制御するLEDバックライト制御回路であり、前記LEDアレイ各々に対して駆動電圧を供給する電源回路(13)と、前記LEDアレイと前記電源回路との間に設けられ、当該電源回路を前記LEDアレイのいずれかに接続する電流切換スイッチ(15)と、前記切換スイッチを順次切り換え、前記LEDアレイに流れる電流値が予め設定された設定電流値と同様となるように、前記電源回路の出力電圧を制御するLEDバックライトコントローラ(12)とを備える。
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