Patent ID: 7602366

Claim:
A liquid crystal display device comprising: 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 mounted 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 is capable of changing an AC driving method during a display period of the first liquid crystal display panel and an AC driving method during a display period of the second liquid crystal display panel which are present within a same frame; wherein the drive circuit outputs a first common voltage for the first liquid crystal display panel and a second common voltage for the second liquid crystal display panel; wherein the drive circuit stops the alternating of the first common voltage during a non-display period of the first liquid crystal display panel and stops the alternating of the second common voltage during a non-display period of the second liquid crystal display panel; and wherein the drive circuit includes a first amplifying circuit which selectively outputs a first common voltage on a high potential side for the first liquid crystal display panel or a second common voltage on a high potential side for the second liquid crystal display panel, a second amplifying circuit which selectively outputs a first common voltage on a low potential side for the first liquid crystal display panel or a second common voltage on a low potential side for the second liquid crystal display panel, a first capacitive element which holds the first common voltage on the high potential side, a second capacitive element which holds the first common voltage on the low potential side, a third capacitive element which holds the second common voltage on the potential side, a fourth capacitive element which holds the second common voltage on the low potential side, a first switching element which outputs the first common voltage on the high potential side immediately before the non-display period which is held by the first capacitive element or the first common voltage on the low potential side immediately before the non-display period which is held by the second capacitive element as the common voltage of the first liquid crystal display panel during the non-display period of the first liquid crystal display panel, and a second switching element which outputs the second common voltage on the high potential side immediately before the non-display period which is held by the third capacitive element or the second common voltage on the low potential side immediately before the non-display period which is held by the fourth capacitive element as the common voltage of the second liquid crystal display panel during the non-display period of the second liquid crystal display panel.