TOUCH SENSOR FUNCTION-EQUIPPED DISPLAY DEVICE

• US 20100231552A1
• Filed: 03/02/2010
• Published: 09/16/2010
• Est. Priority Date: 03/10/2009
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: SAITO, Hiromi, TAKANO, Yasushi
• Granted Patent: US 8,576,195 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A touch sensor function-equipped display device includes: a first substrate that has a common electrode; a second substrate that is disposed to face the first substrate;

• • a display unit that is disposed between the first substrate and the second substrate; and a touch sensor that detects a touch position on a touch surface disposed on the first substrate side or the second substrate side. The second substrate includes: a plurality of data lines that are aligned in a row direction; and a plurality of capacitance lines that are aligned in a column direction approximately perpendicular to the data lines. The touch sensor includes an electric-potential rise rate detecting unit that detects a magnitude of parasitic capacitance generated near each intersection of the plurality of capacitance lines and the plurality of data lines as the rise rate of an electric potential of the data line at the time of application of a voltage to the capacitance line defining the each intersection and detects a position near the intersection in which the rise rate of the electric potential detected by the electric-potential rise rate detecting unit is out of a predetermined range as the touch position.

Claims

1. A touch sensor function-equipped display device comprising:

a first substrate that has a common electrode;

a second substrate that is disposed to face the first substrate;

a display unit that is disposed between the first substrate and the second substrate; and

a touch sensor that detects a touch position on a touch surface disposed on the first substrate side or the second substrate side,

wherein the second substrate includes;

a plurality of data lines that are aligned in a row direction; and

a plurality of capacitance lines that are aligned in a column direction approximately perpendicular to the data lines, and

wherein the touch sensor includes an electric-potential rise rate detecting unit that detects a magnitude of parasitic capacitance generated near each intersection of the plurality of capacitance lines and the plurality of data lines as the rise rate of an electric potential of the data line at the time of application of a voltage to the capacitance line defining the each intersection and detects a position near the intersection in which the rise rate of the electric potential detected by the electric-potential rise rate detecting unit is out of a predetermined range as the touch position.

2. The touch sensor function-equipped display device according to claim 1, wherein the touch sensor sequentially applies voltages to the plurality of capacitance lines and detects the magnitude of the parasitic capacitance generated near each intersection of the capacitance line, to which the voltage is applied, and the plurality of data lines as the rise rate of the electric potential of the data line by using an electric-potential rise rate detecting unit.

3. The touch sensor function-equipped display device according to claim 1, wherein the application of a voltage to the capacitance line is performed in a time in which an image signal is not applied to the plurality of data lines.

4. The touch sensor function-equipped display device according to claim 3, wherein the time in which the image signal is not applied is a retrace period.

5. The touch sensor function-equipped display device according to claim 4, wherein the touch sensor detects the magnitude of the parasitic capacitance generated near each intersection as the rise rate of the electric potential of the data line by using an electric-potential rise rate detecting unit in a plurality of the retrace periods in a divisional manner.

6. The touch sensor function-equipped display device according to claim 4, wherein the touch sensor detects the magnitude of the parasitic capacitance generated near the each intersection as the rise rate of the electric potential of the data line by using the electric-potential rise rate detecting unit in one retrace period.

7. The touch sensor function-equipped display device according to claim 4, wherein the touch sensor detects the magnitude of the parasitic capacitance generated near each intersection as the rise rate of the electric potential of the data line by using the electric-potential rise rate detecting unit at the ratio of one to several retrace periods.

8. The touch sensor function-equipped display device according to claim 1, wherein the display unit includes a liquid crystal layer.