US 9,810,933 B2
Liquid crystal display device and method of driving the same
Kenji Harada, Ishikawa-ken (JP)
Assigned to JAPAN DISPLAY INC., Minato-ku (JP)
Filed by JAPAN DISPLAY INC., Minato-ku (JP)
Filed on Jul. 22, 2014, as Appl. No. 14/338,064.
Application 14/338,064 is a division of application No. 12/912,100, filed on Oct. 26, 2010, granted, now 8,836,684.
Claims priority of application No. 2009-251250 (JP), filed on Oct. 30, 2009.
Prior Publication US 2014/0333862 A1, Nov. 13, 2014
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/038 (2013.01); G09G 5/00 (2006.01); G02F 1/133 (2006.01); G09G 3/36 (2006.01)
CPC G02F 1/13306 (2013.01) [G09G 3/3655 (2013.01); G09G 3/3677 (2013.01); G09G 3/3688 (2013.01); G09G 2310/0245 (2013.01); G09G 2310/0297 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A liquid crystal display device, comprising:
a first substrate including:
a plurality of first electrodes arranged in a matrix of rows and columns;
scan lines extending along with the first electrodes arranged in the row direction;
signal lines extending along with the first electrodes arranged in the column direction;
a pixel switch arranged in an intersection portion of the scan line and the signal line to switch a connection between the signal line and the first electrode by a scan signal applied to the scan line;
a scan line driving circuit to sequentially scan the scan lines;
a plurality of second electrodes arranged so as to counter the first electrodes with an insulating layer positioned between the first electrode and the second electrode, and the second electrodes extending along with the first electrodes in the row direction;
a first voltage supply line to supply a first voltage to the second electrode;
a second voltage supply line to supply a second voltage to the second electrode;
a control circuit;
a first switch circuit arranged between the first and second voltage supply lines and the second electrodes to switch a connection between the first voltage supply line and the second electrodes, and a connection between the second voltage supply line and the second electrodes by a control signal outputted from the control circuit;
a second switch circuit arranged between the first voltage supply line and the signal line to switch a connection between the first voltage supply line and the signal line by the control signal outputted from the control circuit; and
a gate open circuit to receive signals from the scan line driving circuit and the control circuit, the gate open circuit supplying a signal to switch on the pixel switch to the scan line;
a second substrate opposing the first substrate; and
a liquid crystal layer held between the first substrate and the second substrate,
wherein
the control circuit is configured to supply a signal to the first switch circuit, the second switch circuit, and the gate open circuit, the signal being supplied to connect the first voltage supply line with the second electrode by controlling the first switch circuit and to connect the first voltage supply line with the signal line by controlling the second switch circuit, and being simultaneously supplied to all the scan lines through the gate open circuit to simultaneously switch on all the pixel switches connected to all the scan lines, when the liquid crystal display device is powered off, and
the control circuit is further configured to supply a voltage from the first voltage supply line to all the first electrodes, when the liquid crystal display device is powered off.