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 based on the strobe signal a predetermined portion from a current flowing from one of the plurality of terminals, 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.
2 Assignments
0 Petitions
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.
178 Citations
41 Claims
-
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 based on the strobe signal a predetermined portion from a current flowing from one of the plurality of terminals, 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)
-
-
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 portion corresponding to the pulse of the strobe signal from a current flowing from each of the plurality of terminals; 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;
-
29. 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 a common voltage to the counter electrode;
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; and
a position data generation circuit including a plurality of current detection circuits each detecting a current flowing from one of the plurality of terminals and outputting a current signal, 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 current signals, wherein, an independent compensation element is connected to each of the plurality of current detection circuits. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
-
-
38. 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 a common voltage to the counter electrode;
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; and
a position data generation circuit including a plurality of current detection circuits each detecting a current flowing from one of the plurality of terminals and outputting a current signal, 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 current signals,wherein the driving method comprises;
(a) a step of supplying to the display panel a common voltage whose polarity is inverted every predetermined period;
(b) a step of generating position data of the contact point based on the current signals which are respectively output from the plurality of current detection circuits; and
(c) a step of compensating for a stray capacitance that exists when no contact point is formed on the transparent conductive film for position detection. - View Dependent Claims (39, 40, 41)
- 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