CAPACITANCE TYPE INPUT DEVICE AND DISPLAY DEVICE WITH INPUT FUNCTION

• US 20090315854A1
• Filed: 04/02/2009
• Published: 12/24/2009
• Est. Priority Date: 06/18/2008
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Epson Imaging Devices Corporation (Seiko Group)
• Inventors: MATSUO, Mutsumi
• Granted Patent: US 8,400,418 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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

Provided is a capacitance type input device, in which a plurality of first light transmission electrodes extending in a first direction and a plurality of second light transmission electrodes extending in a second direction crossing the first direction are formed in an input region of a light transmission substrate, wherein, when the light transmission substrate is viewed from the top, dummy patterns formed of the same light transmission conductive film as the first light transmission electrodes and the second light transmission electrodes are formed in regions sandwiched between the first light transmission electrodes and the second light transmission electrodes.

Claims

1. A capacitance type input device comprising:

a plurality of first light transmission electrodes extending in a first direction and a plurality of second light transmission electrodes extending in a second direction crossing the first direction are formed in an input region of a light transmission substrate,

wherein, when the light transmission substrate is viewed from the top, dummy patterns formed of the same light transmission conductive film as the first light transmission electrodes and the second light transmission electrodes are formed in regions sandwiched between the first light transmission electrodes and the second light transmission electrodes.

2. The capacitance type input device according to claim 1, wherein the first light transmission electrodes and the second light transmission electrodes are formed of a single layer film.

3. The capacitance type input device according to claim 1, wherein:

the first light transmission electrodes, the second light transmission electrodes and the dummy patterns are formed of the same light transmission conductive film at the same surface side of the light transmission substrate, and

the dummy patterns are formed in a state of being insulated from both the first light transmission electrodes and the second light transmission electrodes.

4. The capacitance type input device according to claim 3, wherein the first light transmission electrodes, the second light transmission electrodes and the dummy patterns are formed of the same light transmission conductive film on the same insulating layer at the same surface side of the light transmission substrate.

5. The capacitance type input device according to claim 1, wherein:

the first light transmission electrodes and the second light transmission electrodes include large-area portions in regions sandwiched between crossing portions of the first light transmission electrodes and the second light transmission electrodes, respectively,

a plurality of slit-shaped gaps sandwiched between the large-area portions is formed between the first light transmission electrodes and the second light transmission electrodes, and

the dummy patterns are formed in the gaps.

6. The capacitance type input device according to claim 5, wherein the dummy patterns are independently formed in each of the plurality of gaps.

7. The capacitance type input device according to claim 5, wherein a plurality of dummy patterns extend in each of the gaps in the longitudinal direction of the gaps in a state of being parallel to each other in the width direction of the gaps.

8. The capacitance type input device according to claim 5, wherein a plurality of dummy patterns are arranged in one of the slit-shaped gaps in a state of being divided in the longitudinal direction of the gaps.

9. The capacitance type input device according to claim 5, wherein, in the width direction of the gaps, the widths of spaces formed between the large-area portions and the dummy patterns are 30 μ

m or less and the sum of the widths of the spaces is 50 μ

m or less.

10. The capacitance type input device according to claim 1, wherein, in the crossing portions, ones of the first light transmission electrodes and the second light transmission electrodes are connected to each other and the others thereof are disconnected from each other,

a light transmission interlayer insulating film is formed on an upper layer side or a lower layer side of ones of the first light transmission electrodes and the second light transmission electrodes in at least the crossing portions, and

at a side opposite to a side, on which the first light transmission electrodes and the second light transmission electrodes are formed, of the upper layer side and the lower layer side of the interlayer insulating film, light transmission relay electrodes for electrically connecting the others of the first light transmission electrodes and the second light transmission electrodes, which are disconnected in the crossing portions, are formed.

11. A display device with an input function, the display device comprising the capacitance type input device according to claim 1,

wherein an image generating device is arranged so as to be overlapped on a side opposite to an input surface of the capacitance type input device.