| 摘要 |
PROBLEM TO BE SOLVED: To provide a common voltage regulation circuit of a liquid crystal display device, which facilitates adjusting a common voltage by adjusting the common voltage by software by means of a surplus pulse width modulation signal generated in a liquid crystal peripheral main board, without installing separate hardware such as a variable resistor, and which reduces the risk of breakage and the manufacturing cost. SOLUTION: The common voltage regulation circuit includes: a data storage means for input of a first selection signal, a second selection signal, and a pulse width modulation signal, and for storing or output of the pulse width modulation signal according to a combination of the first and the second selection signals; a smoothing means for smoothing the externally input pulse width modulation signal to a DC level in a test mode, and smoothing the pulse width modulation signal input from the data storage section 700 to a DC level in a writing mode; and an amplifying means for amplifying the signal smoothed by the smoothing means 702 to a prescribed level and for output of a common voltage signal. COPYRIGHT: (C)2011,JPO&INPIT
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