BACK LIGHT DRIVING DEVICE FOR LIQUID CRYSTAL

PURPOSE:To prevent a video signal processing circuit from being affected by a noise component radiated from a back light driving circuit. CONSTITUTION:A horizontal synchronizing signal is obtained by being counted down from VCO 3 with a frequency divider 4. The horizontal synchronizing signal is com...

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Bibliographische Detailangaben
1. Verfasser:	ABUMI TAKAO
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION 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 FREQUENCY-CHANGING 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:	PURPOSE:To prevent a video signal processing circuit from being affected by a noise component radiated from a back light driving circuit. CONSTITUTION:A horizontal synchronizing signal is obtained by being counted down from VCO 3 with a frequency divider 4. The horizontal synchronizing signal is compared with the horizontal synchronizing signal obtained by synchronizing separating an input video signal by a phase comparator 2, and the VCO 3 is controlled through a low-pass filter, and the horizontal synchronizing signal (2fH) of gradual multiplication locked to the synchronism of the input video signal is obtained. The horizontal synchronizing signal (fH) is 2-frequency divided by a 2-frequency divider 5, and the fH and whose inversion polarity 2fH are switched as the gate signal of an AND/OR gate 6, and the inverted fH signal of gradual multiplication becomes the driving signal of a fluorescent lamp.