Patent ID: 9542030
Date: 2017-01-10
CPC Classifications: G06F

Claim:
1. A display device with integrated touch screen comprising: a panel including a plurality of electrodes, the panel being driven time-divisionally with a display driving period and a touch driving period for each frame period; a touch IC that applies a touch scan signal to the plurality of electrodes during a predetermined period of an n−1th frame (‘n’ is an integer above 2), checks whether or not there is a touch input in the panel through the use of information received from the plurality of electrodes, and outputs a signal indicating whether or not there is the touch input; and a display driver IC that receives the signal from the touch IC and applies a common voltage to the plurality of electrodes for a varied duration based on the signal, wherein the display driver IC applies the common voltage to the plurality of electrodes during a first period of an nth frame if there is the touch input in the panel, and applies the common voltage to the plurality of electrodes during a second period of the nth frame if there is no touch input in the panel, wherein the second period is longer than the first period, wherein the touch IC applies the touch scan signal to all of the plurality of electrodes during a third period of the nth frame if there is the touch input in the panel, and applies the touch scan signal to all of the plurality of electrodes during a fourth period of the nth frame if there is no touch input in the panel, wherein the fourth period is shorter than the third period, and wherein a first ratio of the display driving period to the touch driving period in the nth frame is greater than a second ratio of the display driving period to the touch driving period in the (n-1)th frame if there is no touch input in the panel during the (n-1)th frame period.