Capacitance touch panel

• US 9,280,221 B2
• Filed: 12/01/2010
• Issued: 03/08/2016
• Est. Priority Date: 12/01/2009
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Nah, Hyunmin
• Primary Examiner(s): Lao, Lun-Yi
• Assistant Examiner(s): KHAN, IBRAHIM A
• Application Number:
  US12/957,830
• Publication Number:
  US 20110128252A1
• Time in Patent Office: 1,924 Days
• Field of Search: 345/173, 345/174, 178/18.06
• US Class Current: 1/1
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

Disclosed is a capacitance touch panel, including a substrate, a transparent electrode formed at a partial area of a substrate, and an optical layer formed on the substrate formed with the transparent electrode in an overspreading (blanketing) way, whereby the optical layers are formed on a transparent electrode, each having a different refractive index to reduce a reflexibility of the transparent electrode and a reflexibility of a substrate, thereby improving a transparent electrode-visible phenomenon.

Claims

1. A capacitance touch panel, comprising:

a substrate;

a transparent electrode covering a partial area of the substrate;

an optical layer on the substrate and the transparent electrode, wherein a refractive index of the optical layer is different from that of the transparent electrode; and

an under-coating layer between the substrate and the transparent electrode, the under-coating layer having a refractive index greater than that of the substrate but smaller than that of the transparent electrode;

wherein the optical layer is formed with a uniform thickness on both a first area of the substrate where the transparent electrode is formed and a second area of the substrate where the transparent electrode is not formed,

wherein the thickness of the optical layer is configured such that a first wavelength of first light reflected from the first area and a second wavelength of second light reflected from the second area are interference-offset to reduce reflection of both lights.

wherein the optical layer directly contacts both a top surface and a lateral surface of the transparent electrode, and wherein the under-coating layer is formed of a material different from that of the optical layer.

2. The panel of claim 1, wherein the optical layer is formed of one or more selected from a group consisting of aluminum oxide, SiO₂, zinc oxide, and a mixture thereof.

3. A capacitive touch panel, the panel comprising:

a substrate;

a transparent electrode covering a portion of the substrate; and

an optical layer on both the substrate and the transparent electrode, the optical layer being a single layer, the optical layer having a refractive index different from that of the transparent electrode, the optical layer having a substantially uniform thickness on both a first area of the substrate on which the transparent electrode is formed and a second area of the substrate on which the transparent electrode is not formed, and the optical layer comprising any one of aluminum oxide, zinc oxide, and titan oxide;

wherein the thickness of the optical layer is configured such that a first wavelength of first light reflected from the first area and a second wavelength of second light reflected from the second area are interference-offset to reduce reflection of both lights, and

wherein;

the thickness of the optical layer is in a range of 40 to 60 nm when the optical layer includes aluminum oxide;

the thickness of the optical layer is in a range of 40 to 50 nm when the optical layer includes zinc oxide;

or

the thickness of the optical layer is in a range of 10 to 30 nm when the optical layer includes titan oxide.

4. The panel of claim 3, wherein the optical layer has a substantially uniform thickness on a lateral surface of the transparent electrode and a top surface of the transparent electrode.