| 摘要 |
In a liquid crystal display apparatus, sampling of an A-D converter for the purpose of capturing data from a touch panel is performed at a rate that is unrelated to the AC signal applied to the LCD, and data from the touch panel is captured in a regular manner in accordance with the sampling rate of the A-D converter. An added circuit detects the transformation points of the LCD AC signal and, based on a transformation point detection signal that is output by this circuit, data of the touch panel data sampled by the A-D converter that is affected by LCD noise is discarded, so that only data not affected by LCD noise is sent to a main memory.
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