Liquid Crystal Display Device

Abstract

The present invention realizes an optimum driving method in a miniaturized liquid crystal display device having two liquid crystal display panels so as to realize the 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 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 the same frame.

1 - 7 . (canceled) 
   
   
       8 . 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 includes a booster circuit part, and   the booster circuit part is capable of changing an operational mode thereof in response to an external signal.   
   
   
       9 . A liquid crystal display device according to  claim 8 , wherein
 the booster circuit part includes a first booster circuit and a second booster circuit,   the first booster circuit includes a switching element in which a plurality of transistor elements are connected in parallel,   the booster circuit part is, in response to the external signal, capable of changing a first mode in which the first booster circuit and the second booster circuit are operated in a complementary manner, a second mode in which the first booster circuit is operated and a third mode in which the first booster circuit is operated using one transistor element out of the plurality of transistor elements as the switching element of the first booster circuit.   
   
   
       10 . 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 includes a gray scale voltage generating part,   the gray scale voltage generating part includes a plurality of amplifying circuits which output a plurality of gray scale voltages, and   the drive circuit stops the operation of the amplifying circuits other than the amplifying circuits which output the maximum gray scale voltage and the minimum gray scale voltage among the plurality of amplifying circuits during a non-display period of the first liquid crystal display panel or the second liquid crystal display panel.   
   
   
       11 . 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 includes a gray scale voltage generating part,   the gray scale voltage generating part includes a resistance voltage dividing circuit which divides a maximum gray scale voltage and a minimum gray scale voltage so as to output gray scale voltages other than the maximum gray scale voltage and the minimum gray scale voltage, and   the drive circuit separates the resistance voltage dividing circuit from the maximum gray scale voltage and the minimum gray scale voltage during a non-display period of the first liquid crystal display panel or the second liquid crystal display panel.   
   
   
       12 . A liquid crystal display device according to  claim 11 , wherein
 the gray scale voltage generating part includes a plurality of amplifying circuits which apply gray scale reference voltages to the resistance voltage dividing circuit, and   the drive circuit stops an operation of the plurality of amplifying circuits during a non-display period of the first liquid crystal display panel or the second liquid crystal display panel.   
   
   
       13 . A liquid crystal display device according to  claim 8 , wherein video lines of the second liquid crystal display panel are connected with the drive circuit via the connection lines and video lines of the first liquid crystal display panel. 
   
   
       14 . A liquid crystal display device according to  claim 9 , wherein video lines of the second liquid crystal display panel are connected with the drive circuit via the connection lines and video lines of the first liquid crystal display panel. 
   
   
       15 . A liquid crystal display device according to  claim 10 , wherein video lines of the second liquid crystal display panel are connected with the drive circuit via the connection lines and video lines of the first liquid crystal display panel. 
   
   
       16 . A liquid crystal display device according to  claim 11 , wherein video lines of the second liquid crystal display panel are connected with the drive circuit via the connection lines and video lines of the first liquid crystal display panel. 
   
   
       17 . A liquid crystal display device according to  claim 12 , wherein video lines of the second liquid crystal display panel are connected with the drive circuit via the connection lines and video lines of the first liquid crystal display panel.