HIGH VOLTAGE PULSE DRIVING CIRCUIT FOR LCD

• Main Authors: HWANG, HYUN HA, KIM, HEON KYU, YOON, JUNG HWAN, KANG, SEUN GGON
• Format: Patent
• Language: English
• Published: 26.11.2009
• 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

PURPOSE: A high voltage pulse driving circuit for an LCD is provided to reduce circuit size and cost by one power source, a variable voltage regulator, a pulse transformer without a high voltage LCD IC. CONSTITUTION: In a high voltage pulse driving circuit for an LCD, a variable voltage regulator(20) outputs at least two different out signals according to a reference voltage by receiving an output signal of a constant voltage as an input. A variable resistance part(60) changes the reference voltage of the variable voltage regulator. A first buffer integrated circuit(30) and a second buffer integrated circuit(35) receives an output of a MICOM or an FPGA by using the output voltage of the variable voltage regulator as a driving voltage. A pulse transformer(50) receives the output of the first buffer integrated circuit and the second buffer integrated circuit and amplifies the output voltage with a turn ratio.