| 摘要 |
An LCD(Liquid Crystal Display) controller is provided to prevent burning of an LCD panel due to irregularity in a synchronization signal and properly drive the LCD panel, by correcting a period of a synchronization signal. A counter(15a) of an LCD controller(15) detects a period of a horizontal synchronization signal and a vertical synchronization signal. A comparator(15b) compares a count value with a predetermined minimum value, Min, and maximum value, Max. When the count value is out of a range, a synchronization pulse generator(15c) generates a synchronization pulse at the time when the period falls within a predetermined range. A selector(15e) outputs an input synchronization signal when the period is within the range, and outputs the synchronization pulse, which is obtained from the synchronization pulse generator, when the period is out of the range.
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