FLAT BACKLIGHT DRIVING CIRCUIT OF LIQUID CRYSTAL DISPLAY DEVICE

• Main Authors: CHO, BO HYUNG, LEE, IN KYU, PARK, JOUNG HU
• Format: Patent
• Language: English
• Published: 13.12.2007
• Subjects: 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

A planar beam source driving circuit of a liquid crystal display device is provided to reduce manufacturing cost by improving power consumption and beam efficiency through an energy recovering circuit technique. A coupled inductor(20), whose secondary inductor is coupled with both ends of a planar beam source, supplies a driving voltage to the planar beam source. A source capacitor(Cs) between a primary inductor of the coupled inductor and a ground stores a voltage. A first capacitor(C1) between the primary inductor of the coupled inductor and a voltage source charges or discharges a voltage. A cathode of first diode(d1) is connected to the voltage source and an anode thereof is connected to the primary inductor. A first switch(S1) between the voltage source and the primary inductor executes a switching operation. A second capacitor(C2) between the primary inductor and the ground charges or discharges a voltage. A cathode of a second diode(d2) is connected to the primary inductor and an anode thereof is connected to the ground. A second switch(S2) between the primary inductor and the ground executes a switching operation.