INPUT DISPLAY DEVICE

• US 20130120314A1
• Filed: 11/15/2012
• Published: 05/16/2013
• Est. Priority Date: 11/16/2011
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Ishibashi, Kuniaki, Sugino, Akiko, Chiba, Tsuyoshi, Fujita, Masakuni, Yamaoka, Takashi
• Granted Patent: US 9,916,048 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133738 for homogeneous alignment
• CPC Class Codes: G02F 2202/22 Antistatic materials or arrangements
• 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

Abstract

An input display device includes a liquid crystal layer containing liquid crystal molecules that are homogeneously aligned in an absence of an electric field, a first polarizer disposed on a viewing side of the liquid crystal layer, a capacitive sensor disposed between the first polarizer and the liquid crystal layer, and an antistatic layer disposed between the first polarizer and the capacitive sensor, the antistatic layer being attached to the first polarizer. The capacitive sensor has a transparent substrate, a transparent electrode pattern formed on the transparent substrate, and a first adhesive layer formed on the transparent substrate to embed the transparent electrode pattern, and the antistatic layer has a surface resistance value of 1.0×10⁹ to 1.0×10¹¹Ω/□.

Claims

1. An input display device comprising:

a liquid crystal layer containing liquid crystal molecules that are homogeneously aligned in an absence of an electric field;

a first polarizer disposed on a viewing side of the liquid crystal layer;

a capacitive sensor disposed between the first polarizer and the liquid crystal layer; and

an antistatic layer disposed between the first polarizer and the capacitive sensor, the antistatic layer being attached to the first polarizer,

wherein the capacitive sensor has a transparent substrate, a transparent electrode pattern formed on the transparent substrate, and a first adhesive layer formed on the transparent substrate to embed the transparent electrode pattern, and

wherein the antistatic layer has a surface resistance value of 1.0×

10⁹ to 1.0×

10¹¹Ω

/□

.

2. The input display device according to claim 1, further comprising a retardation film that widens a viewing angle on the viewing side, the retardation film being disposed between the antistatic layer and the first adhesive layer.

3. The input display device according to claim 1, wherein a second polarizer is disposed on a side of the liquid crystal layer opposite to the viewing side via a second adhesive layer.

4. The input display device according to claim 1, wherein the antistatic layer includes any one of a surface active agent, an alkaline metal salt, a polyhydric alcohol, a conductive fine particle and a conductive polymer.

5. The input display device according to claim 4, wherein the alkaline metal salt is bis(trifluoroalkanesulfonyl)imide alkaline metal salt.