BRIEF DESCRIPTION OF THE DRAWINGS
The objectives and advantages of the present invention will become apparent upon reading the following description and upon reference to the accompanying drawings in which:
FIG. 1 to FIG. 4 illustrate a capacitive touch panel according to the first embodiment of the present invention;
FIG. 5 illustrates a capacitive touch device according to the second embodiment of the present invention; and
FIG. 6 and FIG. 7 illustrate a transparent touch panel according to the second embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 to FIG. 4 illustrate a capacitive touch panel 10 according to the first embodiment of the present invention. The capacitive touch panel 10 comprises a transparent substrate 12, a capacitive touch device 20 positioned on the transparent substrate 12, an interfacial structure 50 positioned on the capacitive touch device 20, a display device 40 positioned on the interfacial structure 50, a cap 14 adhered to the transparent substrate 12 by glue (not shown in the drawing), and an absorbent 16. The transparent substrate 12 may include transparent material such as glass, polycarbonate, polyvinyl chloride and methyl methacrylate, and the display device 40 can be an electro luminescent display device, an organic light-emitting display device, or a liquid crystal display device.
Referring to FIG. 2, the display device 40 includes an anode layer 42, a light-emitting layer 44 and a cathode layer 46. The interfacial structure 50 includes an insulating polymer layer 52 positioned on the capacitive touch device 20 and a silicon oxide layer 54 positioned on the insulating polymer layer 52. The insulating polymer layer 52 may include transparent material such as epoxy resin, polyimide, polyvinyl chloride and methyl methacrylate. Preferably, the interfacial structure 50 may further include a conductive layer 56 positioned between the insulating polymer layer 52 and the silicon oxide layer 54 for electromagnetic interference shielding, as shown in FIG. 3. The conductive layer 56 may include transparent conductive material such as indium tin oxide, indium zinc oxide, and aluminum zinc oxide.
Referring to FIG. 3 and FIG. 4, the capacitive touch device 20 according to the first embodiment of the present invention includes a first conductive pattern 22 positioned on the transparent substrate 12, a plurality of first wires 23 positioned on the transparent substrate 12, a dielectric layer 24 covering the first conductive pattern 22 and the first wires 23, a second conductive pattern 26 positioned on the dielectric layer 24, and a plurality of second wires 27 positioned on the dielectric layer 24. The first conductive pattern 22 includes a plurality of first sensing blocks 25A positioned in an array manner, and the second conductive pattern 26 includes a plurality of second sensing blocks 25B positioned in an array manner.
Preferably, the first sensing blocks 25A and the second sensing blocks 25B are interlaced, each first wire 23 connects the first sensing blocks 25A on the same column, and each second wire 27 connects the second sensing blocks 25B on the same row. The first sensing blocks 25A and the second sensing blocks 25B may include transparent conductive material such as indium tin oxide, indium zinc oxide, and aluminum zinc oxide, and the dielectric layer 24 may include epoxy resin, polyimide, or methyl methacrylate.
FIG. 5 illustrates a capacitive touch device 20′ according to the second embodiment of the present invention. The capacitive touch device 20′ includes a first conductive pattern 22′ positioned on the transparent substrate 12, a plurality of first wires 23′ positioned on the transparent substrate 12, a second conductive pattern 26′ positioned on the transparent substrate 12, a dielectric layer 24′ covering the first conductive pattern 22′, the first wires 23′ and the second conductive pattern 26′, and a plurality of second wires 27′ positioned on the dielectric layer 24′. The first conductive pattern 22′ includes a plurality of first sensing blocks 25A′ positioned in an array manner, and the second conductive pattern 26′ includes a plurality of second sensing blocks 25B′ positioned in an array manner. Each first wire 23′ connects the first sensing blocks 25A′ on the same column, and each second wire 27′ connects the second sensing blocks 25B′ on the same row via a plurality of conductive plugs 28 penetrating the dielectric layer 24′.
In particular, the capacitive touch device can be positioned on the transparent substrate 12 in an upside down manner, i.e., the second wires 27′ are positioned on the transparent substrate 12, the dielectric layer 24′ covering the second wires 27′, and the first conductive pattern 22′, the second conductive pattern 26′ and the first wires 23′ are positioned on the dielectric layer 24′.
FIG. 6 and FIG. 7 illustrate a transparent touch panel 60 according to the second embodiment of the present invention. The transparent touch panel 60 comprises a transparent substrate 12 having a top surface 12A and a bottom surface 12B, a display device 40 positioned on the top surface 12A, an interfacial structure 70 positioned on the bottom surface 12B, a capacitive touch device 20 positioned on the interfacial structure 70, and a protective polymer layer 62 covering the capacitive touch device 20.
The interfacial structure 70 includes a conductive layer 72 positioned on the bottom surface 12B and an insulating polymer layer 74 positioned on the conductive layer 72. The protective polymer layer 62 and the insulating polymer layer 74 may include transparent material such as epoxy resin, polyimide, and methyl methacrylate, and the conductive layer 72 may include transparent conductive material such as indium tin oxide, indium zinc oxide, and aluminum zinc oxide for electromagnetic interference shielding.
The capacitive touch device 20 and the display device of the transparent touch panel 10 are encapsulated by the transparent substrate 12 and the transparent cap 14, and the capacitive touch device 20 and the display device of the transparent touch panel 60 are encapsulated by the transparent cap 14 and the protective polymer layer 60. Consequently, the transparent touch panels 10 and 60 possess high transparency, high corrosion resistance, and high scratch resistance such that the lifetime is increased and the application is extended to more hardwares. In addition, the touch-controlling circuit of the capacitive touch devices 20 and 20′ is capacitive, which possesses high precision, high reliability and can be used in high-temperature and high-humidity environments. Furthermore, the capacitive touch device 20 and the display device 40 can be fabricated on the same transparent substrate 12 to simplify the fabrication process.
The above-described embodiments of the present invention are intended to be illustrative only. Numerous alternative embodiments may be devised by those skilled in the art without departing from the scope of the following claims.
Patent Application
20070240914
