TOUCH ELECTRODE DEVICE

A touch electrode device includes a first photosensitive insulating layer, a second photosensitive insulating layer, a first electrode layer and a second electrode layer. The first electrode layer is disposed on a surface of the first photosensitive insulating layer, and the second electrode layer is disposed on a surface of the second photosensitive insulating layer. Another surface of the photosensitive insulating layer is adhered to another surface of the second photosensitive insulating layer. Furthermore, each of the first electrode layer and the second electrode layer includes a non-transparent conductive material.

DETAILED DESCRIPTION OF THE INVENTION

Referring toFIG. 2AandFIG. 2B,FIG. 2Ashows a cross-sectional view of a touch electrode device200according to one embodiment of the present invention andFIG. 2Bshows a manufacturing process of the touch electrode device inFIG. 2A. Only composing elements pertinent to the embodiment are shown in the figures. The touch electrode device200of the embodiment mainly includes a first photosensitive insulating layer21a,a second photosensitive insulating layer21b,a first electrode layer22and a second electrode layer24. The first electrode layer22is formed on a surface of the first photosensitive insulating layer21a,and the second electrode layer24. is formed on a surface of the second photosensitive insulating layer21b. Another surface of the first photosensitive insulating layer21ais adhered to another surface of the second photosensitive insulating layer21b. Each of the first electrode layer22and the second electrodelayer24includes a non-transparent conductive material.

Specifically, each of the first photosensitive insulating layer21aand the second photosensitive insulating layer21bhas an adhesive surface. After the first electrode layer22and the second electrode layer are respectively formed on the first photosensitive insulating layer21aand the second photosensitive insulating layer21b, the first photosensitive insulating layer21a.and the second photosensitive insulating layer21bmay be adhered to each other by the adhesive surfaces of the first photosensitive insulating layer21aand the second photosensitive insulating layer21b,so that a photosensitive insulating layer21may be formed, and the first electrode layer22and the second electrode layer24may respectively be disposed on the opposite surfaces of the photosensitive insulating layer21. Therefore, the process steps and the manufacturing elements may be simplified to reduce the manufacturing cost greatly. Furthermore, as the thickness of the first photosensitive insulating layer21aand the second photosensitive insulating layer21bmay be between 10 and 30 micrometers, therefore the thickness of the photosensitive insulating layer21may be between 20 and 60 micrometers. Accordingly, the overall thickness of the touch electrode device200can be decreased.

Furthermore, the first photosensitive insulating layer21aand the second photosensitive insulating layer21bmay include a photosensitive isolating material, such that the photosensitive insulating layer not only can electrically isolate the first electrode layer22and the second electrode layer24, but also can be employed in an exposure development process.

The first electrode layer22and the second electrode layer24may include a light-transmissive structure made of a non-transparent material. The non-transparent material may include metal nanowires (e.g., silver nanowires or copper nanowires) or metal nanonets (e.g., silver nanonets or copper nanonets). The metal nanowires or nanonets have a diameter in a nanometer order (i.e., a few nanometers to hundreds nanometers), and may be fixed in the first electrode layer22and the second electrode layer24via a plastic material (e.g., resin). Due to fineness of the metal nanowires/nanonets unobservable to human eyes, the first electrode layer22and the second electrode layer made of the metal nanowires/nanonets thus have high light-transmittance, and the overall thickness of the touch electrode device200may also be decreased. As the metal nanowires/nanonets are flatly distributed, the first electrode layer22and the second electrode layer24made of the metal nanowires/nanonets have an isotropic conductivity, which is substantially invariant with respect to direction.

However, according to the embodiment, the first electrode layer22and the second electrode layer24may further include a photosensitive material (e.g., acrylic), through which electrodes with a required pattern may be formed via an exposure development process, so that the process steps and the equipment may be simplified efficiently to eliminate redundancy.

Moreover, the touch electrode device200may further include a cover glass26. The first electrode layer22, the photosensitive insulating layer21and the second electrode layer24are disposed on a bottom surface of the cover glass26in sequence. The cover glass26shown inFIG. 2Amay have a two-dimensional or three-dimensional profile, which may be applied to a two-dimensional or a three-dimensional touch display, respectively. In one embodiment, the cover glass26may include a flexible material or a rigid material, and the surface material of the cover glass26may be treated to have anti-wear, anti-scratch, anti-reflection, anti-glare and anti-fingerprint features.

Referring toFIG. 2C, in another embodiment, the touch electrode device200may further include an isolating layer27, which is disposed between the cover glass26and the first electrode layer22. The isolating layer27may include optically clear adhesive (OCA) or silicon dioxide. The isolating layer27may further include a photosensitive material, through which a required pattern may be formed via an exposure development process. Furthermore, the touch electrode device200may also include a protective film28disposed on a bottom surface of the second electrode layer24, so as to cover the second electrode layer24and provide a protective effect of being electrically isolated.