TOUCH PANEL

• US 20080131624A1
• Filed: 10/02/2007
• Published: 06/05/2008
• Est. Priority Date: 12/05/2006
• Status: Active Grant

• Current Assignee: SMK Corporation
• Original Assignee: SMK Corporation
• Inventors: Egami, Takehiro, Nakayama, Naomi
• Granted Patent: US 7,880,821 B2
• Time in Patent Office: Days
• US Class Current: 428/1.1
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch panel for use in an ultra-high resolution display includes a transparent film substrate having one surface made of PET or the like and a transparent electrode film made of ITO film or the like that is formed on the transparent film substrate. A surface of the film substrate opposite the surface on which the transparent electrode is formed has a coating layer including a filler. The filler has an average particle size of 0.1 μm to 0.01 μm, and the coating layer is formed to have a surface having arithmetic particle roughness (Ra) of 0.1 μm to 0.01 μm, whereby the Ra of the surface of the coating layer is formed to 1/2000^th to 1/4000^th of the pixel pitch of a display to which the touch panel is attached.

Claims

1. A touch panel comprising:

a transparent film substrate and a transparent electrode film formed on one surface thereof;

wherein

an arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m is formed on a surface of the film substrate opposite to another surface on which the transparent electrode is formed, and the arithmetic particle roughness (Ra) is formed to 1/2000^th to 1/4000^th of the pixel pitch of a display to be attached to the touch panel.

4. A touch panel film according to claim 1 wherein an anchor layer is disposed between one surface of the film substrate and the transparent electrode, and a filler of fine particles is distributed and aligned substantially uniformly in a layer within resin in the anchor layer;

the filler having an average particle size of 0.1 μ

m to 0.01 μ

m, thereby forming an arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m on a surface of the anchor layer, the Ra being formed between 1/2000^th to 1/4000^th of the pixel pitch of the display to be attached to the touch panel.

2. A touch panel comprising:

a transparent film substrate;

a transparent electrode film formed on one surface of the transparent film substrate;

a coating layer provided on another surface of the transparent film substrate, and

a filler of fine particles distributed and aligned substantially uniformly in a layer within resin in the coating layer;

wherein the filler has an average particle size of 0.1 μ

m to 0.01 μ

m, a surface of the coating layer is formed to exhibit an arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m, and the Ra is formed to 1/2000^th to 1/4000^th of the pixel pitch of the display to be attached to the touch panel.

8. A touch panel film according to claim 2 wherein an anchor layer is disposed between one surface of the film substrate and the transparent electrode, and a filler of fine particles is distributed and aligned substantially uniformly in a layer within resin in the anchor layer;

the filler having an average particle size of 0.1 μ

m to 0.01 μ

m, thereby forming an arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m on a surface of the anchor layer, the Ra being formed between 1/2000^th to 1/4000^th of the pixel pitch of the display to be attached to the touch panel.

3. A touch panel comprising:

a transparent film substrate and a transparent electrode film formed on one surface of the transparent film substrate;

wherein

a mold formed to have an arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m is pressed against the other surface of the film substrate on the side opposite that on which the transparent electrode is formed, thereby forming the other surface of the film substrate such the it exhibits arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m, the Ra being selected to be 1/2000^th to 1/4000^th of the pixel pitch of a display to be attached to the touch panel.

9. A touch panel film according to claim 3 wherein an anchor layer is disposed between one surface of the film substrate and the transparent electrode, and a filler of fine particles is distributed and aligned substantially uniformly in a layer within resin in the anchor layer;

the filler having an average particle size of 0.1 μ

m to 0.01 μ

m, thereby forming an arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m on a surface of the anchor layer, the Ra being formed between 1/2000^th to 1/4000^th of the pixel pitch of the display to be attached to the touch panel.

5. A method for forming a touch panel, comprising the steps of:

forming a transparent electrode film on a transparent film substrate; and

forming a surface of the transparent film substrate opposite to another surface on which the transparent electrode is formed, wherein the formed surface has an arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m, and wherein the Ra is selected to be between 1/2000^th to 1/4000^th of the pixel pitch of a display to be attached to the touch panel.

6. A method for forming a touch panel, comprising the steps of:

forming a transparent electrode film formed on one surface of a transparent film substrate;

forming a coating layer provided on another surface of the transparent film substrate, and

a filler of fine particles distributed and aligned substantially uniformly in a layer within resin in the coating layer;

wherein the filler has an average particle size of 0.1 μ

m to 0.01 μ

m, a surface of the coating layer is formed to exhibit an arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m, and the Ra is formed to 1/2000^th to 1/4000^th of the pixel pitch of the display to be attached to the touch panel.

7. A method for forming a touch panel, comprising the steps of:

forming a transparent electrode film formed on one surface of a transparent film substrate;

forming a mold having an arithmetic particle roughness (Ra) of 0.1 μ

m to 0.01 μ

m;

pressing the mold against the other surface of the film substrate on the side opposite that on which the transparent electrode is formed, thereby forming the other surface of the film substrate such the it an Ra of 0.1 μ

m to 0.01 μ

m, the Ra being selected to be 1/2000^th to 1/4000^th of the pixel pitch of a display to be attached to the touch panel