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 formed in the pixels respectively;
a plurality of pixel transistors electrically connecting with the plurality of pixel electrodes respectively;
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; and
a driving circuit supplying a common voltage for displaying an image to the common electrodes and a scanning voltage for detecting the conductor to the common electrodes,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 by using the common electrodes in the second period and the fourth period,wherein the pixel transistor supplies an image signal to the pixel electrodes in the third period, and does not supply the image signal to the pixel electrodes in the fourth period, andwherein an outputting rate of the scanning voltage in the fourth period is lower than that in the second period.
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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.
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Citations
15 Claims
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1. A liquid crystal display device comprising:
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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 formed in the pixels respectively; a plurality of pixel transistors electrically connecting with the plurality of pixel electrodes respectively; 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; and a driving circuit supplying a common voltage for displaying an image to the common electrodes and a scanning voltage for detecting the conductor to the common electrodes, 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 by using the common electrodes in the second period and the fourth period, wherein the pixel transistor supplies an image signal to the pixel electrodes in the third period, and does not supply the image signal to the pixel electrodes in the fourth period, and wherein an outputting rate of the scanning voltage in the fourth period is lower than that in the second period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid crystal display device comprising:
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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 formed in the pixels respectively; a plurality of pixel transistors electrically connecting with the plurality of pixel electrodes respectively; 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 and a driving circuit supplying a common voltage for displaying an image to the common electrodes and a scanning voltage for detecting the conductor to the common electrodes, 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 by using the common electrodes in the second period and the fourth period, wherein the pixel transistor is ON state for supplying an image signal to the pixel electrodes in the third period, and is OFF state in the fourth period, and wherein a number of outputting the scanning voltage in the fourth period is lower than that in the second period. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification