LIQUID CRYSTAL DISPLAY DEVICE

• Main Authors: SHINTANI AKIRA, HIRAKATA JUNICHI
• Format: Patent
• Language: English
• Published: 19.11.2003
• Edition: 7
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; BLASTING; 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; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; 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; SEALS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide high quality image display by avoiding the generation of a double contour especially in moving picture display in a liquid crystal display device that has a backlight in which a cold cathode fluorescent lamp and a light emitting diode are simultaneously used. SOLUTION: A cold cathode fluorescent lamp 4 and a light emitting diode 5 are arranged together in the backlight. A first flickering control signal 2002 and a second flickering control signal 2004 of the diode which are respectively amplified by a first pulse amplitude amplifying circuit 301 and a second pulse amplitude amplifying circuit 302 are respectively integrated by a first integrating circuit that consists of a resistor 3011, a capacitor 3013 and a diode 3012 and a second integrating circuit that consists of a resistor 3021, a capacitor 3023 and a diode 3022, and the respective outputs are inputted into a third operational amplifier 303 and the output of the amplifier 303 is supplied to a light emitting diode driving circuit 21. COPYRIGHT: (C)2004,JPO