Display device with touch sensor, and drive method for the device
First Claim
1. A touch-sensored display device comprising:
- a display panel including;
an active matrix substrate having a plurality of pixel electrodes, a display medium layer, and a counter substrate disposed on a viewer side of the active matrix substrate via the display medium layer, the counter substrate having a counter electrode which opposes the plurality of pixel electrodes;
a display panel driving circuit for supplying display signal voltages to the plurality of pixel electrodes, and supplying to the counter electrode a common voltage which undergoes periodic inversion in polarity;
a transparent conductive film for position detection, placed so as to oppose the counter electrode via the counter substrate;
a plurality of terminals connected to different points on the transparent conductive film for position detection;
an AC voltage generation circuit for supplying an AC voltage for position detection to the plurality of terminals; and
a position data generation circuit including;
a strobe signal generation circuit for generating a strobe signal which is in synchronization with a polarity inversion period of the common voltage, and a plurality of noise-cut current signal generation circuits each being connected to one of the plurality of terminals and generating a noise-cut current signal which is obtained by eliminating a noise ascribable to an induced voltage that occurs on the transparent conductive film responsive to the common voltage from a current flowing from one of the plurality of terminals by using the strobe signal, wherein the induced voltage is induced on the transparent conductive film for position detection, the position data generation circuit generating position data of a contact point which is formed directly or indirectly on the transparent conductive film for position detection, the position data being generated based on the noise-cut current signal.
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Accused Products
Abstract
A touch-sensored display device 20 according to the present invention includes: a counter substrate 6 disposed on a viewer side of an active matrix substrate 8 via a display medium layer 4, the counter substrate 6 having a counter electrode 5 which opposes pixel electrodes; a display panel driving circuit 14 for supplying to the counter electrode 5 a common voltage which undergoes periodic inversion in polarity; a transparent conductive film 7 for position detection placed so as to oppose the counter electrode 5 via the counter substrate 6; a strobe signal generation circuit 32 for generating a strobe signal which is in synchronization with a polarity inversion period of the common voltage, and a noise-cut current signal generation circuit 30 for generating a noise-cut current signal which is obtained by eliminating based on the strobe signal a predetermined portion from a current flowing from a terminal connected to the transparent conductive film 7 for position detection.
22 Citations
28 Claims
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1. A touch-sensored display device comprising:
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a display panel including;
an active matrix substrate having a plurality of pixel electrodes, a display medium layer, and a counter substrate disposed on a viewer side of the active matrix substrate via the display medium layer, the counter substrate having a counter electrode which opposes the plurality of pixel electrodes;a display panel driving circuit for supplying display signal voltages to the plurality of pixel electrodes, and supplying to the counter electrode a common voltage which undergoes periodic inversion in polarity; a transparent conductive film for position detection, placed so as to oppose the counter electrode via the counter substrate; a plurality of terminals connected to different points on the transparent conductive film for position detection; an AC voltage generation circuit for supplying an AC voltage for position detection to the plurality of terminals; and a position data generation circuit including;
a strobe signal generation circuit for generating a strobe signal which is in synchronization with a polarity inversion period of the common voltage, and a plurality of noise-cut current signal generation circuits each being connected to one of the plurality of terminals and generating a noise-cut current signal which is obtained by eliminating a noise ascribable to an induced voltage that occurs on the transparent conductive film responsive to the common voltage from a current flowing from one of the plurality of terminals by using the strobe signal, wherein the induced voltage is induced on the transparent conductive film for position detection, the position data generation circuit generating position data of a contact point which is formed directly or indirectly on the transparent conductive film for position detection, the position data being generated based on the noise-cut current signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A driving method for driving a touch-sensored display device which includes:
- a display panel including an active matrix substrate having a plurality of pixel electrodes, a display medium layer, and a counter substrate disposed on a viewer side of the active matrix substrate via the display medium layer, the counter substrate having a counter electrode which opposes the plurality of pixel electrodes;
a display panel driving circuit for supplying display signal voltages to the plurality of pixel electrodes, and supplying to the counter electrode a common voltage which undergoes periodic inversion in polarity;
a transparent conductive film for position detection, placed so as to oppose the counter electrode via the counter substrate;
a plurality of terminals connected to different points on the transparent conductive film for position detection;
an AC voltage generation circuit for supplying an AC voltage for position detection to each of the plurality of terminals; and
a plurality of noise-cut current signal generation circuits each being connected to one of the plurality of terminals,wherein the driving method comprises; a step of supplying a horizontal synchronizing signal to the display panel driving circuit; a step of supplying to the display panel the common voltage, the polarity of the common voltage being inverted at a point in time after the lapse of a predetermined period from a pulse of the horizontal synchronizing signal; a step of generating a strobe signal having a pulse which rises or falls before the predetermined period elapses since a pulse of the horizontal synchronizing signal and which falls or rises after the predetermined period has elapsed; a step of generating a plurality of noise-cut current signals obtained by eliminating a noise ascribable to an induced voltage that occurs on the transparent conductive film responsive to the common voltage from a current flowing from each of the plurality of terminals by using the strobe signal, wherein the induced voltage is induced on the transparent conductive film for position detection; and a step of, based on the plurality of noise-cut current signals, generating position data of a contact point which is formed directly or indirectly on the transparent conductive film for position detection. - View Dependent Claims (25, 26, 27, 28)
- a display panel including an active matrix substrate having a plurality of pixel electrodes, a display medium layer, and a counter substrate disposed on a viewer side of the active matrix substrate via the display medium layer, the counter substrate having a counter electrode which opposes the plurality of pixel electrodes;
Specification