Coordinate input device, image display device, and electronic apparatus

• US 20050146516A1
• Filed: 11/30/2004
• Published: 07/07/2005
• Est. Priority Date: 12/11/2003
• Status: Abandoned Application

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Nishiyama, Takashi
• Application Number:
  US10/999,600
• Publication Number:
  US 20050146516A1
• Time in Patent Office: Days
• US Class Current: 345/176
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

In an analog resistive film type coordinate input device, first and second light-transmitting substrates oppose each other with an insulating layer interposed therebetween, transparent conductive films are respectively formed on inner sides of the respective substrates, and printed circuits connected to the transparent conductive films are respectively formed at peripheries of the substrates. A decorative printing layer is formed between a transparent conductive formed on an inner side of the second light-transmitting substrate and the second light-transmitting substrates, such that the printed circuits arranged at the peripheries of the substrates cannot be viewed form the operation surface side of the second light-transmitting substrate. A liquid crystal display device contains the coordinate input device on a front side of a liquid crystal display unit.

Claims

1. A coordinate input device in which a first light-transmitting substrate and a second light-transmitting substrate oppose each other with an insulating layer interposed therebetween, the second light-transmitting substrate having one surface serving as an operation surface;

transparent conductive films are formed on respective inner sides of the light-transmitting substrates;

printed circuits connected to the transparent conductive films are respectively formed at peripheries of the light-transmitting substrates; and

a voltage is alternately applied to the printed circuits formed on the first and second light-transmitting substrates, and an output voltage from the substrate to which the voltage is not applied is detected, such that a coordinate of a pressed position can be detected,

wherein a decorative printing layer is formed between the transparent conductive film formed on the inner side of the second light-transmitting substrate and the second light-transmitting substrate; and

the printed circuits respectively formed at the peripheries of the first and second light-transmitting substrates are concealed by the decorative printing layer, such that the printed circuits cannot be viewed from the operation surface of the second light-transmitting substrate.

2. The coordinate input device according to claim 1,

a transparent overcoat layer is formed between the transparent conductive film formed on the inner side of the second light-transmitting substrate and the decorative printing layer.

3. The coordinate input device according to claim 1,

wherein a thickness of the decorative printing layer is from 0.01 μ

m to 100 μ

m.

6. An image display device comprising a coordinate input device according to claim 1 on a front side thereof.

7. An electronic apparatus comprising, on its display unit, an image display device having a coordinate input device according to claim 1 on a front side thereof.

4. A coordinate input device in which a first light-transmitting substrate and a second light-transmitting substrate oppose each other with an insulating layer interposed therebetween, the second light-transmitting substrate having one surface serving as an operation surface;

transparent conductive films are formed on respective inner sides of the light-transmitting substrates;

printed circuits connected to the transparent conductive films are respectively formed at peripheries of the light-transmitting substrates; and

a voltage is alternately applied to the printed circuits formed on the first and second light-transmitting substrates, and an output voltage from the substrate to which the voltage is not applied is detected, such that a coordinate of a pressed position can be detected,

wherein a decorative printing sheet is formed on an outer surface of the second light-transmitting substrate; and

the printed circuits respectively formed at the peripheries of the first and second light-transmitting substrates are concealed by the decorative printing sheet, such that the printed circuits cannot be viewed from the operation surface of the second light-transmitting substrate.

5. The coordinate input device according to claim 4,

wherein a thickness of the decorative printing sheet is from 0.015 mm to 0.3 mm.

8. An image display device comprising a coordinate input device according to claim 4 on a front side thereof.

9. An electronic apparatus comprising, on its display unit, an image display device having a coordinate input device according to claim 4 on a front side thereof.