POWER SUPPLY DEVICE

PROBLEM TO BE SOLVED: To solve the problem that a step-up circuit increases the mounting area of a power supply IC which supplies a drive voltage to an LCD panel and an LED element. SOLUTION: An LCD panel module 130 comprises a common step-up converter 100, an step-up circuit 110 for an LCD, an LDO...

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Bibliographische Detailangaben
Hauptverfasser:	OTA TAKAHIRO, ITO TOMOMASA, YAMAMOTO ISAO
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER CRYPTOGRAPHY DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DISPLAY EDUCATION ELECTRICITY FREQUENCY-CHANGING GENERATION NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS SEALS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To solve the problem that a step-up circuit increases the mounting area of a power supply IC which supplies a drive voltage to an LCD panel and an LED element. SOLUTION: An LCD panel module 130 comprises a common step-up converter 100, an step-up circuit 110 for an LCD, an LDO control circuit 120, and constant current circuits 114 and 124 for parallel LED elements 112 and serial LED elements 122. A type switching part 108 switches between a type 1 for connecting parallel LED elements 112 and a type 2 for connecting serial LED elements 122. The common step-up converter 100 preliminary steps up a battery voltage Vbat of a lithium ion battery 11 to a low voltage V1/high potential V2, and supplies it to the parallel LED element 112/serial LED element 122. The step-up circuit 110 for LCD steps up the low potential V1 and supplies it to an LCD panel 140, and the LDO control circuit 120 steps down the high potential V2 and supplies it to the LCD panel 140. COPYRIGHT: (C)2005,JPO&NCIPI