Patent Application
20140333851
The present disclosure generally relates to a touch screen panel and a method for manufacturing the touch screen panel.
Touch screen panels are an input device that, for example, allows manual instruction to be input by touching the screen. A typical touch screen panel includes a substrate, a plurality of sensing electrodes and a plurality of driving electrodes arranged among the plurality of sensing electrodes. The plurality of sensing electrodes and the plurality of driving electrodes are made of a transparent electrode material, such as indium tin oxide film (ITO). The driving electrodes are electrically coupled to each other in a first direction. The sensing electrodes are dispersed between the driving electrodes, do not overlap the driving electrodes and can be formed to have separated patterns along a second direction that intersects the first direction. A plurality of insulating layers is formed on the driving electrodes and the sensing electrodes. Each insulating layer is formed on each two neighboring sensing electrodes and overlaps portions of two driving electrodes positioned adjacent to the two neighboring sensing electrodes to provide an insulation property. A plurality of conducting connecters are formed and each conducting connecter is located on one insulating layer. Two ends of the conducting connecter protrude from the insulating layer and electrically couple the two neighboring sensing electrodes. Liner properties (thickness, length, width) of a conducting layer provide different conductivities of the conducting layer and affect properties of the touch screen panel. However, it is difficult to control liner properties (thickness, length, width) of a conducting layer in the manufacturing process.
The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean “at least one.”
The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected.
The driving electrodes 32 and the sensing electrodes 34 can be formed of a transparent electrode material, such as indium tin oxide film (ITO), indium-zinc oxide (IZO), zinc oxide (ZnO), carbon nano-tubes (CNT), a conductive polymer, or graphene which can be transparent and has electric conductivity on the substrate 10. The substrate 10 can be made of transparent insulation material, such as polyethylene terephthalate (PET), polyimide (PI), or polycarbonate (PC) for example. The plurality of sensing electrodes 34 and the plurality of driving electrode 32 can be formed wherein a transparent electrode material layer 30 is etched on the substrate 10.
A plurality of conducting connectors 70 can be formed on the plurality of insulating layers 50. Each conducting connector 70 can be formed on one insulating layer 50 and can electrically contact the corresponding two neighboring sensing electrodes 34 via the two through holes 52 of each insulating layer 50. Thereby, the sensing electrodes 34 arranged in the same row along the second direction Y can be electrically coupled to each other. A thickness of the conducting connector 70 can be about 0.1 μm to 1 μm. A width of the conducting connector 70 can be substantially equal to or greater than the diameter of the through hole 52. In the illustrated embodiment, the conducting connector 70 and the insulating layer 50 can be formed via an ink jet printing method. The insulating layers 50 are made of thermosetting, UV-type and transparent organic materials, such as polyimide (PI). The conducting connector 70 is made of one from the group including graphene, silver nanowire, carbon nanotube, and highly conductive polymer. In other embodiments, the through holes 52 can be in other shapes, such as circular, rectangular, and the number of the through holes 52 can be three or more.
In 201, the transparent electrode material layer can be formed on the substrate. In the illustrated embodiment, the transparent electrode material layer is made of a material, such as indium tin oxide film (ITO), indium-zinc oxide (IZO), zinc oxide (ZnO), carbon nanotubes (CNT), a conductive polymer, or graphene which is transparent and has electric conductivity on the substrate. The substrate can be made of transparent insulation material, such as polyethylene terephthalate (PET), polyimide (PI), or polycarbonate (PC), for example. The transparent electrode material layer can be coated on the substrate by a sputtering coating method.
In 202, the plurality of driving electrodes and the plurality of sensing electrodes can be formed via etching the transparent electrode material layer. The driving electrodes and the sensing electrodes can be formed in mesh structures on the substrate. The driving electrodes can be electrically coupled to each other along the first direction X. The sensing electrodes can be dispersed between the driving electrodes not overlapping the driving electrodes and can be formed to have separated patterns along the second direction Y. Thereby, the sensing electrodes can be insulated from each other. In present embodiment, the transparent electrode material layer can be etched via a chemical etching method, the driving electrodes in the same row along the first direction X can be electrically connected with each other, and the driving electrodes in the same row along the second direction Y can be insulated from each other.
In 203, The plurality of insulating layers, each having two through holes, can be patterned on the plurality of driving electrodes and the plurality of sensing electrodes via ink jet printing. Each insulating layer can be located on at least two neighboring sensing electrodes along the second direction Y, and each through hole can be located above corresponding sensing electrode. In the illustrated embodiment, the insulating layers can be formed via an ink jet printing method. The thickness of the conducting connector can be about 0.1 μm to 1 μm. The insulating layer can be substantially rectangular-shaped. In other embodiments, the insulating layer can be in other shapes, such as a triangle, a hexagon, or circle. The width of each insulating layer can be about 100 μm to 300 μm, and the length of each insulating layer can be about 300 μm to 600 μm. The diameter of the through hole can be about 50 μm to 150 μm.
In 204, referring to
As described above, through holes can be defined in the in insulating layer and each through hole can be positioned above a corresponding sensing electrode, the conducting connector can fill the through holes for electrically connecting with the two neighboring sensing electrodes. Shapes and sizes of the through holes can be the same, thereby liner properties of the conducting connectors can be easily controlled accurately in a filling process. The conductive properties of the conducting connectors having same liner properties and shapes, and improved touch properties.
While the present disclosure has been described with reference to particular embodiments, the description is illustrative of the disclosure and is not to be construed as limiting the disclosure. Therefore, those of ordinary skill in the art can make various modifications to the embodiments without departing from the true spirit and scope of the disclosure, as defined by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102116942 | May 2013 | TW | national |
