Active-matrix driving device, electrostatic capacitance detection device, and electronic equipment

• US 20050083768A1
• Filed: 08/12/2004
• Published: 04/21/2005
• Est. Priority Date: 09/01/2003
• Status: Active Grant

• Current Assignee: 138 East LCD Advancements Limited (Vector Capital Corporation)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Hara, Hiroyuki
• Granted Patent: US 7,375,714 B2
• Time in Patent Office: Days
• US Class Current: 365/232
• CPC Class Codes: G06V 40/1306 non-optical, e.g. ultrasonic or capacitive sensing
• CPC Class Codes: G11C 11/22 using ferroelectric elements

Abstract

Aspects of the invention are intended to stabilize the initial state of an active matrix so as to reduce unnecessary power consumption and stabilize the operation. The driving device can include a selection device that is coupled to any of a plurality of row direction lines and any of a plurality of column direction lines, and by which a selected state and a non-selected state of the row direction lines or the column direction lines are switched to each other. The driving device can also include a device that switches to the non-selected state that switches the selection device coupled to the row direction lines or the selection device coupled to the column direction lines to a non-selected state. Selection by the selection device can be implemented after the selection device is switched to a non-selected state by the device that switches to the non-selected state.

Claims

1. A driving device that drives an active matrix where a plurality of row direction lines and a plurality of column direction lines are arranged in a manner of intersecting each other, and an active element selected by one of the row direction lines and one of the column direction lines is disposed at each intersection so as to form a matrix, the driving device comprising:

a selection device that is coupled to any of the plurality of row direction lines or any of the plurality of column direction lines, a selected state and a non-selected state of the row direction lines or the column direction lines being switched to each other; and

a device that switches to the non-selected state which switches the plurality of row direction lines coupled to the selection device or the plurality of column direction lines coupled to the selection device to a non-selected state simultaneously, selection by the selection device being implemented after the row direction lines coupled to the selection device or the column direction lines coupled to the selection device being switched to a non-selected state by the device that switches to the non-selected state.

2. The driving device according to claim 1:

the selection device further comprising a switch device that switches between a conductive state and a non-conductive state between each of the row direction lines or each of the column direction lines and an external circuit, and a signal supply device that supplies a signal for switching between a conductive state and a non-conductive state to the switch device; and

the device that switches to the non-selected state controlling so that a signal that switches the switch device to a non-conductive state is generated from the signal supply device, so as to switch the switch device into a non-conductive state.

3. The driving device according to claim 1:

the selection device further comprising a signal supply device that supplies a selecting signal or a non-selecting signal for each of the row direction lines or each of the column direction lines; and

the device that switches to the non-selected state controlling so that the non-selecting signal is generated from the signal supply device.

4. The driving device according to claim 2, the device for switching to non-selected state supplying a signal that makes the plurality of row direction lines or the plurality of column direction lines be electrically coupled to a potential supply line of a given potential when the device that switches to the non-selected state makes the signal supply device produce a signal that switches the switch device to a non-conductive state.

5. The driving device according to claim 2:

the signal supply device being made up of a shift register that sequentially switches any of the plurality of row direction lines or any of the plurality of column direction lines to a selected state; and

the device that switches to the non-selected state eliminating data in the shift register.

6. The driving device according to claim 5, the device that switches to the non-selected state eliminating the data by supplying a reset signal to each stage of the shift register.

7. The driving device according to claim 1, the device that switches to the non-selected state switches both of the row direction lines coupled to the selection device and the column direction lines coupled to the selection device to a non-selected state.

8. An electrostatic capacitance detection device reading ridges and valleys information of a surface of a target object by a detection signal corresponding to electrostatic capacitance formed between the target object and the electrostatic capacitance detection device, the electrostatic capacitance detection device comprising:

a matrix where a plurality of row direction lines and a plurality of column direction lines are arranged in a manner of intersecting each other, and an electrostatic capacitance detection circuit that is selected by one of the row direction lines and one of the column direction lines and outputs the detection signal, is disposed at each intersection;

a selection device coupled to any of the plurality of row direction lines or any of the plurality of column direction lines, a selected state and a non-selected state of the row direction lines or the column direction lines being switched to each other; and

a device that switches to the non-selected state which switches the plurality of row direction lines coupled to the selection device or the plurality of column direction lines coupled to the selection device to the non-selected state simultaneously, selection by the selection device being implemented after the row direction lines coupled to the selection device or the column direction lines coupled to the selection device being switched to a non-selected state by the device that switches to the non-selected state.

9. Electronic equipment that includes an active matrix where a plurality of row direction lines and a plurality of column direction lines are arranged in a manner of intersecting each other, and an active element selected by one of the row direction lines and one of the column direction lines is disposed at each intersection, so as to form a matrix, the driving device comprising:

a selection device that is coupled to any of the plurality of row direction lines or any of the plurality of column direction lines, a selected state and a non-selected state of the row direction lines or the column direction lines being switched to each other; and

a device that switches to the non-selected state which switches the plurality of row direction lines coupled to the selection device or the plurality of column direction lines coupled to the selection device to the non-selected state simultaneously, selection by the selection device being implemented after the row direction lines coupled to the selection device or the column direction lines coupled to the selection device being switched to a non-selected state by the device that switches to the non-selected state.