Coordinate input device and liquid crystal display device with such device

• US 20030174128A1
• Filed: 03/14/2003
• Published: 09/18/2003
• Est. Priority Date: 03/18/2002
• Status: Active Grant

• Current Assignee: Alps Alpine Co., Ltd.
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Matsufusa, Hideto
• Granted Patent: US 6,825,890 B2
• Time in Patent Office: Days
• US Class Current: 345/205
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• 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 coordinate input device including: an upper film substrate; a first electrode layer formed on a rear surface of the upper film substrate; a lower film substrate; a second electrode layer formed on a surface of the lower film substrate, the surface facing the first electrode layer; and a transparent dielectric film held and bonded between the upper and lower film substrates. In the coordinate input device, the upper and lower film substrates and the first and second electrode layers are transparent.

Claims

1. A coordinate input device comprising:

an upper film substrate;

a first electrode layer formed on a rear surface of said upper film substrate;

a lower film substrate;

a second electrode layer formed on a surface of said lower film substrate, the surface facing said first electrode layer; and

a transparent dielectric film held between said upper and lower film substrates,

wherein said upper and lower film substrates and said first and second electrode layers are transparent.

2. The coordinate input device of claim 1, wherein said dielectric film comprises:

a transparent base; and

transparent adhesive layers respectively formed on top and bottom surfaces of the base, and

said upper and lower film substrates are bonded to said dielectric film with said transparent adhesive layers.

3. The coordinate input device of claim 1, wherein said upper film substrate has first and second end portions opposed to each other,

said first electrode layer is formed from a plurality of drive electrode patterns extending in a direction from the first end portion of said upper film substrate to the second end portion thereof and insulated from each other,

a plurality of ground patterns extending in a direction from the second end portion to the first end portion are formed between said drive electrode patterns;

the ground patterns are each electrically connected.

4. A liquid crystal display device comprising:

a liquid crystal cell; and

a coordinate input device provided on a front surface of said liquid crystal cell,

wherein said coordinate input device comprises;

an upper film substrate;

a first electrode layer formed on a rear surface of said upper film substrate;

a lower film substrate;

a second electrode layer formed on a surface of said lower film substrate, the surface facing said first electrode layer; and

a transparent dielectric film held between said upper and lower film substrates, and

wherein said upper and lower film substrates and said first and second electrode layers are transparent.

5. The liquid crystal display device of claim 4, wherein said liquid crystal cell and coordinate input device are housed in a housing to be integrated.