Liquid crystal display device
First Claim
1. A liquid crystal display device comprising:
- a liquid crystal display panel that has a first substrate, a second substrate, and a liquid crystal sandwiched between the first substrate and the second substrate;
a plurality of pixels formed in a display section of the first substrate;
a plurality of pixel electrodes respectively formed in the pixels;
a plurality of common electrodes respectively formed as facing to the pixel electrodes, formed in the first substrate, and used for detection of a conductor approaching or touching;
a common voltage circuit supplying a common voltage for displaying an image to the common electrodes;
a scanning control circuit supplying a scanning voltage for detecting the conductor to the common electrodes; and
wherein the display device has a first mode for displaying an image in the display section and a second mode that is a standby mode,wherein the first mode has a first period for displaying an image and a second period for detecting,wherein the second mode has a third period in which the display section is in a standby state and a fourth period for detecting,wherein the display panel detects the conductor with using the common electrodes in the second period and the fourth period,wherein an image signal is supplied to the pixel electrodes in the third period, and an image signal is not supplied to the pixel electrodes in the fourth period, andwherein detection accuracy in the fourth period is lower than detection accuracy in the second period.
0 Assignments
0 Petitions
Accused Products
Abstract
In a liquid crystal display (LCD) device having a touch panel function, power consumption is reduced in the standby state. The display section is divided into blocks each of which is formed of a plurality of display lines. The counter electrode is disposed for each block. A driving circuit selectively supplies, to the counter electrode of each block, the voltage used for the liquid crystal display and the voltage used for the touch panel scanning. The driving circuit has a source amplifier that supplies the video voltages to the video lines. The driving circuit reduces the current in the source amplifier, such that the current is lower than current at the time of a normal operation, to lower the power consumption, and stops the operation of the source amplifier and supplies the GND voltage to the video lines to further lower the power consumption.
-
Citations
13 Claims
-
1. A liquid crystal display device comprising:
-
a liquid crystal display panel that has a first substrate, a second substrate, and a liquid crystal sandwiched between the first substrate and the second substrate; a plurality of pixels formed in a display section of the first substrate; a plurality of pixel electrodes respectively formed in the pixels; a plurality of common electrodes respectively formed as facing to the pixel electrodes, formed in the first substrate, and used for detection of a conductor approaching or touching; a common voltage circuit supplying a common voltage for displaying an image to the common electrodes; a scanning control circuit supplying a scanning voltage for detecting the conductor to the common electrodes; and wherein the display device has a first mode for displaying an image in the display section and a second mode that is a standby mode, wherein the first mode has a first period for displaying an image and a second period for detecting, wherein the second mode has a third period in which the display section is in a standby state and a fourth period for detecting, wherein the display panel detects the conductor with using the common electrodes in the second period and the fourth period, wherein an image signal is supplied to the pixel electrodes in the third period, and an image signal is not supplied to the pixel electrodes in the fourth period, and wherein detection accuracy in the fourth period is lower than detection accuracy in the second period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification