Touch panel

• US 7,538,288 B1
• Filed: 03/31/2008
• Issued: 05/26/2009
• Est. Priority Date: 03/31/2008
• Status: Expired due to Fees

• Current Assignee: Mildex Optical Inc.
• Original Assignee: Mildex Optical Inc.
• Inventors: Huang, Wei-Lung
• Primary Examiner(s): LEE, KYUNG S
• Application Number:
  US12/058,922
• Time in Patent Office: 421 Days
• Field of Search: 200/5.A, 200/511, 200/512, 200/600, 345/173, 345/174
• US Class Current: 200/512
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: H01H 2203/008 Wires
• CPC Class Codes: H01H 2207/014 Plated through holes
• CPC Class Codes: H01H 2239/012 Decoding impedances
• CPC Class Codes: H01H 2239/064 Simulating the appearance of touch panel

Abstract

A touch panel has an upper conductive layer, a lower conductive layer, a substrate and multiple electrical connectors. The upper conductive layer has an upper film and two X-electrodes being formed adjacent to the upper film. The lower conductive layer has a lower film, two Y-electrodes and multiple through holes. The Y-electrodes are formed adjacent to the lower film and perpendicularly to the X-electrodes. Each through hole corresponds to an X or Y-electrode. The substrate has multiple wires and multiple mounting holes. Each wire is formed on a bottom of the substrate and aligned with the X or Y-electrode. The mounting holes are formed through the substrate and respectively aligned to the through holes. Each electrical connector is mounted through corresponding mounting and through holes and connects the wires and electrodes. Therefore the touch panel is easily produced with high-precision flatness.

Claims

1. A touch panel comprising:

an upper conductive layer having

a lower surface;

an upper film being formed on the lower surface and having two opposite X-edges; and

two X-electrodes being respectively formed along the X-edges of the upper film;

a lower conductive layer being aligned with and adhering beneath the upper conductive layer and having

an upper surface being mounted adjacent to the lower surface of the upper conductive layer;

a lower film being formed on the upper surface and having

two opposite X-edges corresponding to the X-edges of the upper film; and

two opposite Y-edges being substantially perpendicular to the X-edges of the lower film;

two Y-electrodes being respectively formed along the two Y-edges of the lower film; and

multiple through holes being formed through the lower conductive layer and corresponding to the X-electrodes and the Y-electrodes;

a substrate being mounted beneath the lower conductive layer using optical adhesive and having

a bottom having an edge;

multiple wires being formed on the bottom, respectively aligned with the X-electrodes and the Y-electrodes and each wire having a terminus extending towards the edge of the bottom; and

multiple mounting holes being formed through the substrate and positioned on the wires and respectively aligning with the through holes of the lower conductive layer; and

multiple electrical connectors being respectively mounted in the mounting holes and having

bottom ends connecting to corresponding wires; and

top ends protruding through corresponding through holes of the lower conductive layer and connecting to the electrodes.

2. The touch panel as claimed in claim 1 further comprising a flexible printed circuit board being mounted on the bottom of the substrate and electrically connecting to the terminuses of the wires.

3. The touch panel as claimed in claim 1, wherein

the edge further has a mount;

and

the terminuses of the wires are at the mount of the edge of the bottom of the substrate.

4. The touch panel as claimed in claim 2, wherein

the upper conductive layer further has a thickness-compensation coating being formed on the lower surface around the upper film of the upper conductive layer;

and

the lower conductive layer further has a thickness-compensation coating being formed on the upper surface around the lower film of the lower conductive layer.

5. The touch panel as claimed in claim 4, wherein the thickness-compensation coatings of the upper and the lower conductive layer are made of non-conductive ink.

6. The touch panel as claimed in claim 4, wherein

the thickness-compensation coatings of the upper conductive layer are made of silver paste and further has

two X-sections respectively connecting to the X-electrodes;

and

two Y-sections being respectively separated from the upper film and the X-sections by a gap; and

the thickness-compensation coating of the lower conductive layer are made of silver paste and further has

two Y-sections respectively connecting to the Y-electrodes; and

two X-sections being respectively separated from the lower film and the Y-sections by a gap.

7. The touch panel as claimed in claim 1, wherein the X-electrodes and the Y-electrodes are made of silver paste.

8. The touch panel as claimed in claim 1, wherein

the upper conductive layer further has a thickness-compensation coating being formed on the lower surface around the upper film of the upper conductive layer;

and

the lower conductive layer further has a thickness-compensation coating being formed on the upper surface around the lower film of the lower conductive layer.

9. The touch panel as claimed in claim 8, wherein the thickness-compensation coatings of the upper and the lower conductive layer are made of non-conductive ink.

10. The touch panel as claimed in claim 8, wherein

the thickness-compensation coatings of the upper conductive layer are made of silver paste and further has

two X-sections respectively connecting to the X-electrodes;

and

two Y-sections being respectively separated from the upper film and the X-sections by a gap; and

the thickness-compensation coating of the lower conductive layer are made of silver paste and further has

two Y-sections respectively connecting to the Y-electrodes; and

two X-sections being respectively separated from the lower film and the Y-sections by a gap.