Capacitive touch sensing assembly

• US 8,115,751 B2
• Filed: 12/30/2008
• Issued: 02/14/2012
• Est. Priority Date: 12/30/2008
• Status: Active Grant

• Current Assignee: Young Fast Optoelectronics Company Limited
• Original Assignee: Young Fast Optoelectronics Company Limited
• Inventors: Lin, Teh-Zheng
• Primary Examiner(s): Agustin, Peter Vincent
• Application Number:
  US12/346,782
• Publication Number:
  US 20100164900A1
• Time in Patent Office: 1,141 Days
• Field of Search: None
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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 capacitive touch sensing assembly is a plate body assembled by a first and second substrate glued by a gluing layer. The first and second substrates are insulated transparent thin plates, and the gluing layer is an insulated transparent adhesive. On an upper surface of the first substrate, a capacitive sensing layer including a plurality of transparent first and second axis traces intersecting to each other. Induction-spots formed on each first axis trace are connected one by one, and induction-spots formed on each second axis trace are formed separately with gaps. An inducting layer has a plurality of conducting wires formed along the direction of the second axis traces. Electrical joints formed on two ends of the conducting wires contact the two adjacent induction-spots of the second axis traces respectively so as to electrically connect all induction-spots on each second axis trace.

Claims

1. A capacitive touch sensing assembly comprising:

a first substrate made of highly transparent insulated thin plate, and on

a surface thereof further comprising at least;

a capacitive sensing layer of a transparent thin film with good conductivity having a plurality of first and second axis traces intersecting to each other;

induction-spots formed on each first axis trace being connected one by one, and induction-spots formed on each second axis trace being formed insulated;

an end of each first and second axis trace being respectively conducted to metal conducting wires formed on edges of the substrate and then being conducted to a signal output terminal;

an inducting layer having a plurality of conducting wires formed along the direction of the second axis traces;

electrical joints formed on two ends of the conducting wires contacting the two adjacent induction-spots of the second axis traces respectively so as to electrically connect all induction-spots on each second axis trace;

an isolating layer having a plurality of insulated films covered between the conducting wires of the inducting layer and the capacitive sensing layer;

the conducting wire except the electrical joints thereof being covered by the insulated films from contacting the capacitive sensing layer;

a second substrate made of highly transparent insulated thin plate having an opaque frame formed on an edge of a bottom surface of the second substrate; and

a gluing layer being an insulated transparent UV adhesive arranged between the first and the second substrates so as to glue the first and the second substrates as a plate body.

2. The capacitive touch sensing assembly as claimed in claim 1, wherein the first and the second substrates are thin plates made of one of material of glass, Polycarbonate (PC), Polythylene terephthalate (PET), polymethylmethacrylate (PMMA), and Cyclic Olefin Copolymer (COC).

3. The capacitive touch sensing assembly as claimed in claim 1, wherein the capacitive sensing layer is a transparent conductive film made of one material of Indium Tin Oxide (ITO) and Poly ethylenedioxythiophene (PEDOT).

4. The capacitive touch sensing assembly as claimed in claim 1, wherein the first and the second axis traces are approximately perpendicular to each other.

5. The capacitive touch sensing assembly as claimed in claim 1, wherein the inducting layer is a transparent conductive film made of one material of Indium Tin Oxide (ITO) and Poly ethylenedioxythiophene (PEDOT).

6. The capacitive touch sensing assembly as claimed in claim 1, wherein conducting wires of the inducting layer are made of opaque metal with a diameter less than 20 μ

m.

7. The capacitive touch sensing assembly as claimed in claim 1, wherein the electrical joints with wider contact area than the conducting wire itself are formed on two ends of each conducting wire.

8. The capacitive touch sensing assembly as claimed in claim 1, wherein the insulated thin films of the isolating layer are highly transparent insulated thin films with a permittivity about 2 to 4 and with a thickness less than 2 μ

m.

9. The capacitive touch sensing assembly as claimed in claim 8, wherein the highly transparent insulated thin films are made of one material of ink and Polythylene terephthalate (PET).

10. The capacitive touch sensing assembly as claimed in claim 1, wherein edges of the insulated films of the isolating layer are gradually thinner outwards as a slope.

11. The capacitive touch sensing assembly as claimed in claim 10, wherein an angle of a cross section of the slope on the insulated film is less than 45 degrees.

12. The capacitive touch sensing assembly as claimed in claim 1, wherein the opaque frame formed on the second substrate is made of one of ink and metal-sputtered film.

13. The capacitive touch sensing assembly as claimed in claim 1, wherein the gluing layer is made of one of a light curing adhesive or heat curing adhesive.

14. The capacitive touch sensing assembly as claimed in claim 1, wherein a transparent conductive layer is formed on one surface of the plate body assembled by the first and the second substrates.

15. The capacitive touch sensing assembly as claimed in claim 14, wherein the transparent conductive layer is one of an Indium Tin Oxide (ITO) film and a Poly ethylenedioxythiophene (PEDOT) film.