This application claims priority to China Application Serial Number 201710784755.9, filed Sep. 1, 2017, which is herein incorporated by reference.
The present invention relates to a touch panel. More particularly, the present invention relates to a touch panel having a first fanout circuit overlapping a second fanout circuit.
With the development of the touch sensing technology, the quality of the touch device has been continuously improving. For a touch device, how to increase the available screen area is always an important issue in the industry. For example, smart phones with narrow border design have already become mainstream in the current market.
However, border widths are determined by the manufacturing process of conductive circuits, and the manufacturing process for the conductive circuits such as printing, laser, photolithography, and other processes have reached their limit on the line width of the conductive circuitry. So how to achieve an even more extremely narrow border under the limitations of aforementioned existing processes is an imperative problem to be solved in the industry.
The disclosure provides a touch panel having a touch sensing region and a peripheral circuit region. The touch panel includes a transparent substrate, a touch sensing layer, a first fanout circuit, and a second fanout circuit. The touch sensing layer is located above the transparent substrate and is disposed in the touch sensing region, in which the touch sensing layer has a plurality of sensing units. The first fanout circuit is disposed in the peripheral circuit region. The second fanout circuit is disposed in the peripheral circuit region and is located above the first fanout circuit, in which the first fanout circuit and the second fanout circuit are electrically connected to the sensing units respectively, in which a projection of the first fanout circuit on the transparent substrate and a projection of the second fanout circuit on the transparent substrate at least partially overlaps each other.
In some embodiments, the touch panel further includes a patterned insulating layer. The patterned insulating layer is located between the first fanout circuit and the second fanout circuit, in which the first fanout circuit and the second fanout circuit are electrically insulated from each other by the patterned insulating layer.
In some embodiments, the patterned insulating layer includes plural vias. The second fanout circuit is connected to the sensing units through a conductive material in some of the vias of the patterned insulating layer respectively, in which the conductive material and the first fanout circuit are made of a substantially similar material.
In some embodiments, the touch panel further includes at least a bridge structure. The bridge structure is connected between adjacent two of the sensing units, in which the at least one bridge structure includes an insulating bump and a connecting line.
In some embodiments, the connecting line crosses over the insulating bump and is electrically connected to the adjacent two of the sensing units.
In some embodiments, the connecting line is electrically connected to the adjacent two of the sensing units through at least an opening of the insulating bump.
In some embodiments, the patterned insulating layer and the insulating bump are made of a substantially similar material.
In some embodiments, the connecting line and the second fanout circuit are made of a substantially similar material.
In some embodiments, the first fanout circuit has a first widZith, the second fanout circuit has a second width, in which a projection of the first width of the first fanout circuit on the transparent substrate entirely overlaps a projection of the second width of the second fanout circuit on the transparent substrate.
In some embodiments, the first fanout circuit has a first width, the second fanout circuit has a second width, in which a projection of the first width of the first fanout circuit on the transparent substrate is partially shifted from a projection of the second width of the second fanout circuit on the transparent substrate.
It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the invention as claimed.
The invention can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows:
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
Please refer to
In particular, as the present embodiment shown in
As the present embodiment shown in
On the other hand, as the embodiment shown in
For example, as the embodiment shown in
As such, by configuring the first fanout circuit 140 and the second fanout circuit 150 on different levels, and making the projection of the first fanout circuit 140 and the projection of the second fanout circuit 150 at least partially overlap with each other on the transparent substrate 110, a width of the peripheral circuit region PA of the touch panel 100 may be reduced, and thus the pursuing for an extreme narrow border is achieved.
On the other hand, as the embodiment shown in
On the other hand, as the present embodiment shown in
For example, in the present embodiment, the first fanout circuit 140 and the sensing units 121 may be formed by performing a lithography etching process on a stack of conductive materials (which at least includes two layers of conductive materials). In addition, as the embodiment shown in
And in the present embodiment, the insulating bump 123a of the touch sensing region TA and the patterned insulating layer 130 of the peripheral circuit region PA are also belong to a same insulating layer, and may be formed by performing a patterning process to a same material. In other words, in the present embodiment, the material of the insulating bump 123a and the material of the patterned insulating layer 130 are substantially the same. In the present embodiment, the insulating bump 123a and the patterned insulating layer 130 may be formed by performing a patterning process on an insulating material layer.
In addition, in the present embodiment, the connecting line 123b in the touch sensing region TA and the second fanout circuit 150 in the peripheral circuit region PA are both belong to a same conductive material layer, and may be formed in a same process. In other words, the material of the connecting line 123b and the material of the second fanout circuit 150 are substantially the same. In the present embodiment, the connecting line 123b and the second fanout circuit 150 may be formed by performing a lithography etching process or a grid printing process on a conductive material layer.
As such, the touch panel 100 may be manufactured by existing processes, there is no need to add additional processes to form the configuration that the first fanout circuit 140 and the second fanout circuit 150 are located on different levels. As such, the projection of the first fanout circuit 140 and the projection of the second fanout circuit 150 partially overlap each other on the transparent substrate 110, so a width of the peripheral circuit region PA may be reduced, and thus the pursuing of the narrow border is achieved.
As such, as aforementioned, by configuring the first fanout circuit 140 and the second fanout circuit 150 on different levels, and making the projection of the first fanout circuit 140 and the projection of the second fanout circuit 150 partially overlap each other on the transparent substrate 110, the peripheral circuit region PA of the touch panel 200 may be reduced, and thus the pursuing of an extreme narrow border is achieved.
As such, by configuring the first fanout circuit 140 and the second fanout circuit 150 on different levels, and making the projection of the first fanout circuit 140 and the second fanout circuit 150 at least partially overlap with each other on the transparent substrate 110, a width of the peripheral circuit region PA of the touch panel 300 may be reduced, and thus the pursuing for an extreme narrow border is achieved.
In summary, in the embodiment of the present disclosure, by configuring the first fanout circuit and the second fanout circuit on different levels and making the projection of the first fanout circuit and the projection of the second fanout circuit at least partially overlap each other on the transparent substrate, the width of the peripheral circuit region is reduced, and thus the pursuing of an extreme narrow border is achieved. And the configuration of the touch panel of the present disclosure may be formed by existing processes, such that the first fanout circuit and the second fanout circuit are located on different levels, so there is no need to add additional processes. The quality of the product is improved without increasing manufacturing cost.
Although the present invention has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims.
Number | Date | Country | Kind |
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201710784755.9 | Sep 2017 | CN | national |