PLANE LIGHT SOURCE, BACKLIGHT DEVICE, AND LIQUID CRYSTAL DISPLAY PANEL

PROBLEM TO BE SOLVED: To provide a downright backlight and its light source realizing a liquid crystal display panel with a center area of a display screen of high brightness even if the screen is enlarged. SOLUTION: The plane light source has two discharge lamps (411, 412), (421, 422), (431, 432) o...

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1. Verfasser:	KAWASHIMA YASUTAKA
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING 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 ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY FREQUENCY-CHANGING HEATING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED LIGHTING MECHANICAL ENGINEERING NON-LINEAR OPTICS NON-PORTABLE LIGHTING DEVICES OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS SYSTEMS THEREOF TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a downright backlight and its light source realizing a liquid crystal display panel with a center area of a display screen of high brightness even if the screen is enlarged. SOLUTION: The plane light source has two discharge lamps (411, 412), (421, 422), (431, 432) of a turnup structure of a tube form in a U-shape arrayed back to back so as to have tube center parts facing each other, and each discharge lamp is lit with both high voltage type impressing alternate-current voltages with phases different by 180° on one and the other electrodes. Although brightness at the tube center is lower than at both ends of the tube for each lamp, since the lamps are arrayed back to back, a back-to-back part is equal to two lamps in effect, and therefore, the center part area of an image display screen has a brightness higher than the periphery part overall. COPYRIGHT: (C)2004,JPO&NCIPI