| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving circuit of a LCD panel, which is capable of overdriving in all gray levels and doesn't require preliminary determination of a driving pattern based on an experiment or the like. SOLUTION: The driving circuit of the LCD panel includes; an operational amplifier OP 21 which has a voltage for charging a pixel with a current gradation, inputted to a non-inverting input thereof and has a charging voltage of the corresponding pixel of one field before, inputted to an inverting input thereof; OPs 24 and 25 which detect whether a charged state of the pixel is within a range sufficiently deviated from a set value or within a range approximating to the set value; a NAND 24 which detects output states of the OPs 24 and 25; and a Pch MOSFET 27 which switches an operation state of overdriving the pixel with supply voltages Vdd and Vss of the OP 21 by turning off a circuit between the inverting input and the output of the OP 21 to operate the OP 21 as a converter and an operation state of charging the pixel with a gradation voltage by turning on the circuit between the inverting input and the output of the OP 21 to operate the OP 21 as a buffer, in accordance with an output of the NAND 24. COPYRIGHT: (C)2007,JPO&INPIT
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