An optimum driving method is realized in a miniaturized liquid crystal display device having two liquid crystal display panels so as to low power consumption. The liquid crystal display device includes a first liquid crystal display panel, a second liquid crystal display panel, a drive circuit which is mounted on the first liquid crystal display panel, output terminals which are formed on the first liquid crystal display panel and to which signals outputted from the drive circuit are supplied, and connection lines which connect the output terminals and the second liquid crystal display panel,wherein the drive circuit can change the AC driving method employed during a display period of the first liquid crystal display panel and the AC driving method employed during a display period of thesecond liquid crystal display panel which are present within the same frame.