Patent Publication Number: US-2016224142-A1

Title: Touch device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This Non-provisional application claims priority under 35 U.S.C. §119(a) to Chinese Patent Application No. 201510055936.9 filed in the People&#39;s Republic of China on Feb. 3, 2015 and Chinese Patent Application No. 201510198175.2 filed in the People&#39;s Republic of China on Apr. 24, 2015, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND OF THE DISCLOSURE 
     1. Field of the Disclosure 
     The present disclosure relates to touch technology field, and more particularly, to a touch device. 
     2. Description of the Related Art 
     As technology progresses, fingerprint identification technology is widely applied to various electronic devices because of the security identification features it provides. In recent years, fingerprint identification technology has been used for mobile devices due to its good security and privacy protection. Accordingly, the fingerprint identification technology has become the focus of public attention, and will become a subsequent important development direction of similar electronic devices. 
     A touch device typically includes a cover lens, which is configured to provide an operation area for users giving control by touching and protects functional elements under the cover lens, and a fingerprint identified structure, which is disposed under the cover lens, especially in a groove of the lower surface of the cover lens. Considering the touch operation area side of the touch device, the existence of the groove may affect the visual appearance of the touch device. For instance, the light may leak from side surfaces of the groove, or appearance defects may occur due to the height difference of the side surface and the button surface of the groove. 
     SUMMARY OF THE DISCLOSURE 
     In view of above mentioned, an embodiment of the disclosure provides a touch device. The touch device includes a touch sensing structure, a cover lens, a first mask layer, a second mask layer and a fingerprint identified structure. The cover lens has a first surface and a second surface opposite to the first surface. The first surface is a touch surface. The cover lens has a groove, which is disposed on the second surface, and has a top surface and a side surface adjacent to the top surface. The first mask layer covers the top surface of the groove. The second mask layer covers the side surface of the groove, which the color of the second mask layer and the first mask layer are different. At least a portion of the fingerprint identified structure is disposed on the top surface in the groove. The touch sensing structure is disposed on the second surface. 
     In some embodiments of the disclosure, the orthographic projection of the first mask layer on the first surface is a fingerprint identified area, the orthographic projection of the second mask layer on the first surface is a fingerprint labeled area, and the fingerprint identified area is surrounded by the fingerprint labeled area. 
     In some embodiments of the instant disclosure, the first mask layer further covers a peripheral area of the second surface to form a frame area, and the fingerprint identified area and the fingerprint labeled area are in the frame area. 
     In some embodiments of the instant disclosure, a color of the first mask layer and the second mask layer are black, white, red, gold or blue respectively. 
     In some embodiments of the instant disclosure, the second mask layer is formed on the side surface by pad printing or ink jet printing. 
     In some embodiments of the instant disclosure, an angle between the top surface and the side surface is greater than 90 degrees. 
     In some embodiments of the instant disclosure, the angle between the top surface and the side surface is in a range from 90 degrees to 175 degrees. 
     In some embodiments of the instant disclosure, the angle between the top surface and the side surface is in a range from 110 degrees to 165 degrees. 
     In some embodiments of the instant disclosure, a minimum distance between the top surface of the fingerprint identified structure and the first surface of the cover lens is in a range from 10 μm to 500 μm. 
     In some embodiments of the instant disclosure, a surface of the fingerprint identified structure close to the top surface of the groove is a top surface of the fingerprint identified structure, and the minimum distance between the top surface of the fingerprint identified structure and the first surface of the cover lens is in a range from 50 μm to 450 μm or from 80 μm to 400 μm. 
     In some embodiments of the instant disclosure, the touch device further includes a first fixed layer disposed between the fingerprint identified structure and the first mask layer. 
     In some embodiments of the instant disclosure, the touch device further includes a second fixed layer disposed between the fingerprint identified structure and the second mask layer. 
     In some embodiments of the instant disclosure, the first fixed layer and the second fixed layer fill the groove. 
     In some embodiments of the instant disclosure, the second fixed layer encompasses the fingerprint identified structure. 
     In some embodiments of the instant disclosure, the fingerprint identified structure is in direct contact with the first mask layer. 
     In some embodiments of the instant disclosure, the fingerprint identified structure is a sensing electrode structure disposed in the groove and on a portion of the second surface. 
     In some embodiments of the instant disclosure, the fingerprint identified structure is an integrated circuit chip. 
     In some embodiments of the instant disclosure, the touch sensing structure is a touch sensing electrode structure formed on the cover lens. 
     In some embodiments of the instant disclosure, the touch sensing structure includes a substrate and a touch sensing layer disposed on a side of the substrate, and the touch sensing layer is the touch sensing electrode structure. 
     In some embodiments of the instant disclosure, the cover lens further has a side surface connecting the first surface and the second surface, and the touch device further includes a buffer layer disposed on the side surface which connects the first surface and the second surface. 
     In some embodiments of the instant disclosure, the touch device further includes a first optical repair layer disposed between the top surface and the first mask layer. 
     In some embodiments of the instant disclosure, the touch device further includes a second optical repair layer disposed between the side surface and the second mask layer. 
     In some embodiments of the instant disclosure, a thickness of the first optical repair layer is in a range from 1 μm to 100 μm. 
     In some embodiments of the instant disclosure, a material of the first optical repair layer is a transparent organic gel, a transparent ink or a semi-transparent ink. 
     In some embodiments of the instant disclosure, a thickness and a material of the second optical repair layer and the first optical repair layer are the same. 
     The first mask layer and the second mask layer have different color and cover the top surface and the side surface of the groove respectively. The first mask layer and the second mask layer have more uniform shielding for opaque elements such as the fingerprint identified structure under the first mask layer and the second mask layer, so as to prevent the light leaking from the groove, especially from the side surface of the groove. The color difference between the first mask layer and the second mask layer are used to enhance their color contrast, so as to improve the poor visual appearance of the touch device caused by the same color mask layer, which cannot uniform shielding due to the different reflection angles of light on the side surface and top surface of the groove. The second mask layer may be formed as the fingerprint labeled area to specifically indicate the location of the fingerprint identified area. 
     A first optical repair layer is disposed between the top surface of the groove and the first mask layer, and a second optical repair layer is disposed between the side surface of the groove and the second mask layer. The first optical repair layer and the second optical repair layer fill and repair marks and tiny cracks of the groove due to the surface treatment process, reduce fogging and modified marks. Consequently, the surface of the groove becomes transparent and flat, the optical performance is recovered, and the appearance is improved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It is noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. 
         FIG. 1  is a schematic top view of a touch device according to some embodiment of the disclosure. 
         FIG. 2  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 3  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 4  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 5  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 6  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 7  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 8  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 9  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 10  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 11  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 12  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 13  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
         FIG. 14  is a cross-sectional view of a touch device taken along line  2  shown in  FIG. 1  according to some embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE DISCLOSURE 
     The following embodiments are disclosed with accompanying diagrams for detailed description. For illustration clarity, many details of practice are explained in the following descriptions. However, it should be understood that these details of practice do not intend to limit the present disclosure. That is, these details of practice are not necessary in parts of embodiments of the present disclosure. Furthermore, for simplifying the drawings, some of the conventional structures and elements are shown with schematic illustrations. 
       FIG. 1  is a schematic top view of a touch device  100  according to some embodiments of the disclosure.  FIG. 2  is a cross-sectional view of the touch device  100  taken along line  2  shown in  FIG. 1  according to some embodiments of the disclosure. The touch device  100  may be used in a mobile device such as a smart phone or a tablet computer. 
     As shown in  FIGS. 1 and 2 , the touch device  100  includes a touch sensing structure  110 , a cover lens  120 , a fingerprint identification structure  130 , a first mask layer  140  and a second mask layer  142 . The cover lens  120  has a first surface  121  and a second surface  122  opposite to the first surface  121 . The first surface  121  is provided as a touch surface for users. The touch sensing structure  110  is disposed on and in direct physical contact with the second surface  122  in some embodiments. The cover lens  120  has a groove  123 , which is cut into the second surface  122  and thus is disposed on the second surface  122 . The groove  123  has a top surface  124  and a side surface  125  adjacent to the top surface  124 . An angle θ between the top surface  124  and side surface  125  is greater than 90 degrees. Specifically, the groove  123  is formed by depressed from the second surface  122  in toward the first surface  121 . At least a portion of the fingerprint identification structure  130  is disposed on the top surface  124  in the groove  123 . The first mask layer  140  covers the top surface  124  of the groove  123 , the second mask layer  142  covers the side surface  125  of the groove  123 , and a color of the first mask layer  140  and the second mask layer  142  are different. 
     More specifically, the color of the first mask layer  140  and the second mask layer  142  is black, white, red, gold or blue respectively. 
     In addition, the orthographic projection of the first mask layer  140  on the first surface  121  is a fingerprint identification area  121 R, the orthographic projection of the second mask layer  142  on the first surface  121  is a fingerprint labeled area  121 E. The fingerprint identification area  121 R is surrounded by the fingerprint labeled area  121 E. Specifically, the fingerprint labeled area  121 E is located on at least one side of the fingerprint identification area  121 R so as to specifically indicate the location of the fingerprint identification area  121 R. Further, the first mask layer  140  further covers a peripheral area of the second surface  122  to form a frame area  121 F, and an area, which is not covered by the first mask layer  140  and the second mask layer  142 , is defined as touch display area  121 T. The frame area  121 F is located on at least one side of the touch display area  121 T. The fingerprint identification area  121 R and the fingerprint labeled area  121 E are located in the frame area  121 F. 
     Accordingly, the first surface  121  in a top view is divided into the touch display area  121 T, the frame area  121 F, fingerprint identification area  121 R, and the fingerprint labeled area  121 E, as shown in  FIG. 1 . Specifically, the orthographic projection of the frame area  121 F on the second surface  122  is a portion of the second surface  122  covered by the first mask layer  140 . The orthographic projection of the touch display area  121 T on the second surface  122  is a portion of the second surface  122  corresponding to the touch sensing structure  110 , as shown in  FIGS. 1 and 2 . At least a portion of the orthographic projection of the fingerprint identification structure  130  on the first surface  121  overlaps with the fingerprint identification area  121 R. In addition, the orthographic projection of the fingerprint identification structure  130  on the first surface  121  does not overlap with the orthographic projection of the touch sensing structure  110  on the first surface  121 . 
     The side surface  125  of the groove  123  is covered by the first mask layer  140  and the second mask layer  142 , which have different color, so as to form a fingerprint labeled area  121 E, which can specifically indicate the location of the fingerprint identification area  121 R for subsequent identifying fingerprint easily. Besides, using the same color mask layer or the first mask layer  140  simultaneously covering the side surface  125  and the top surface  124  of the groove  123  may cause the poor visual appearance of the touch device  100  due to the different reflection angles of light on the side surface  125  and top surface  124  of the groove  123 , and the design of instant disclosure can prevent such problems of the poor visual appearance of the touch device  100 . 
     Specifically, the first mask layer  140  is substituted with the second mask layer  142 , so that the first mask layer  140  covers the side surface  125  and the top surface  124  of the groove  123 . As a result, the frame area  121 F and the fingerprint labeled area  121 E are referred to together as a frame area because the first mask layer  140  covering the side surface  125  of the groove  123  and the first mask layer  140  covering the frame area  121 F are the same color. However, the side surface  125  of the groove  123  is a slope connecting the top surface  124  and the second surface  122 , and the first mask layer  140  corresponding to the fingerprint labeled area  121 E is disposed on the slope. Therefore, when users look from the top side of the touch device  100 , it will find that the color of the frame area  121 F and fingerprint labeled area  121 E have gradient difference so as to affect the visual appearance of the touch device  100 . 
     In contrast, the first mask layer  140  and the second mask layer  142 , which have different color, cover the top side  124  and the side surface  125  of the groove  123  respectively. As a result, the first mask layer  140  and the second mask layer  142  have more uniform shielding for opaque elements such as the fingerprint identification structure  130  on the top surface  124  and the side surface  125  of the groove  123  under the first mask layer  140  and the second mask layer  142 . At the same time, the first mask layer  140  and the second mask layer  142  prevent the light leaking from the groove  123 , especially from the side surface  125  of the groove  123 . Since the colors of the first mask layer  140  and the second mask layer  142  are different, the color difference between the first mask layer  140  and the second mask layer  142  is fully used to enhance their color contrast, so as to improve the poor visual appearance of the touch device  100  caused by the same color mask layer, which cannot provide uniform shielding due to the different reflection angles of light on the side surface  125  and top surface  124  of the groove  123 . In addition, the color of the second mask layer  142  and the first mask layer  140  are different, so that the second mask layer  142  is formed as the fingerprint labeled area  121 E to specifically indicate the location of the fingerprint identification area  121 R, and further enhance the convenience of use of the touch device. 
     In some embodiments of the instant disclosure, the shape of the fingerprint identification area  121 R is a rectangle. The shape of a peripheral area of the fingerprint labeled area  121 E, which is corresponding to the shape of the fingerprint identification area  121 R, may include, but not limited to, a rectangle. In other embodiments, the shape of the fingerprint identification area  121 R may be a diamond, a circle or an oval. The shape of a peripheral area of the fingerprint labeled area  121 E, which is corresponding to the shape of the fingerprint identification area  121 R, may be a diamond, a circle or an oval. Therefore, the exterior design of the touch device  100  is able to be stylized in various ways. 
     The first mask layer  140  and the second mask layer  142  are usually formed of opaque inks, photoresists or other similar materials to shield some opaque elements such as flexible circuit boards, conductive traces and other things under the cover lens  120 . The first mask layer  140  may be a single-layer structure or a multi-layer structure stacked by the multi-layer material. A thickness of the first mask layer  140  is in a range from 0 to 20 μm. One should note that the materials of the first mask layer  140  and the second mask layer  142  mentioned above are only exemplary, but not intended to limit the instant disclosure. One of ordinary skill in the art of the instant disclosure should be flexible to choose the materials of the first mask layer  140  and the second mask layer  142  depending on the actual needs. 
     In some embodiments of the instant disclosure, a method of forming the first mask layer  140  on the top surface  124  of the cover lens  120  and the frame area  121 F of the second surface  122  may be coating and then photolithography or silk-screen printing. 
     Specifically, a method of coating includes the following steps. First, the first mask layer  140  is coated on the top surface  124  of the groove  123  and the second surface  122 . (The cover lens  120  compared to  FIG. 2  is inverted at this time. In other words, the second surface  122  is an upper surface, and the groove  123  is upward.) Next, a process of photolithography is performed, and the first mask layer  140  covering the orthographic projection of the touch display area  121 T on the second surface  122  is removed. As a result, the first mask layer  140  is uniformly formed on the top surface  124  of the cover lens  120  and an area located on the frame area  121 F of the second surface  122 . 
     The second mask layer  142  is formed on the side surface  125  of the cover lens  120  after that the first mask layer  140  is formed on the top surface  124  of the cover lens  120  and the area located on the frame area  121 F of the second surface  122 . A method of forming the second mask layer  142  on the side surface  125  of the cover lens  120  may be ink jet printing or pad printing. 
     A slope (as side surface  125 ) connecting the top surface  124  and the second surface  122  is formed because an angle between the top surface  124  and the side surface  125  is greater than 90 degrees. The second mask layer  142  may be directly formed on the side surface  125  by ink jet printing or pad printing. Therefore, the situation in which the second mask layer  142  cannot be formed on the side surface  125  or the second mask layer  142  cannot be uniformly formed on the side surface  125 , which results in incomplete shielding of the first mask layer  140  and the second mask layer  142 , does not occur. 
     In addition, it is noted that the first mask layer  140  and the second mask layer  142  are disposed between the cover lens  120  and the fingerprint identification structure  130 . In other words, the first mask layer  140  and the second mask layer  142  are formed on the cover lens  120 , and then the fingerprint identification structure  130  is formed on the first mask layer  140  and the second mask layer  142  during the process. Specifically, the fingerprinting identified structure  130  is at least disposed on the top surface  124  of the groove  123 . Particularly, the fingerprinting identified structure  130  is disposed on the first mask layer  140  or further covers the second mask layer  142 . The fingerprint identification structure  130  further covers the first mask layer  140  of the second surface  122  and is disposed on the second mask layer  142  covering the side surface  125  of the groove  123 . 
     To ensure sensitivity and accuracy of fingerprint identification, the distance between the fingerprint identification structure  130  and the first surface  121  is reduced, so that the distance between the fingerprint identification structure  130  and the touch objects, such as fingers, is not too large. Simultaneously, in order to ensure the strength and impact resistance of the cover lens  120 , and protect the elements such as the touch sensing structure  100  under the cover lens  120  from external destructive events, it is better to increase a thickness of the cover lens  120 . Therefore, with forming the groove  123  on the second surface  122  of the cover lens  120  and disposing the fingerprint identification structure  130  in the groove  123 , a portion of the cover lens  120  apart from the groove  123  still can maintain a proper thickness (in other words, the thickness D 2  of the non-groove region is greater than the thickness D 1  of the groove region), so as to ensure the sensitivity and accuracy of fingerprint identification, and the strength of the touch device  100  (or the strength of the cover lens  120 ). 
     Specifically, a minimum distance D between the first surface  121  and the top surface of the fingerprint identification structure  130  of the cover lens  120  may be in a range from 50 μm to 450 μm, so that the fingerprint identification structure  130  can be more sensitive to detect the fingerprint on the cover lens  120  during operation. In some embodiments, the minimum distance D may be in a range from 80 μm to 400 μm. The top surface of the fingerprint identification structure  130  is a surface of the fingerprint identification structure  130  near the top surface  124  of the groove  123 . It should be noted that some functional films may be disposed on the first surface of the cover lens  120 . In some embodiments, the functional layer is an antireflective, antiglare or other similar films. When other functional films are disposed on the first surface  121 , the minimum distance D may be a minimum distance between a physical touch surface and the top surface of the fingerprint identification structure  130 . In other words, it is a minimum distance between the top surface of the fingerprint identification structure  130  and a top surface, which is away from the cover lens  120 , of the functional film. 
     The side surface  125  of the groove  123  will be formed as a slope connecting the top surface  124  and the second surface  122  because the angle between the top surface  124  and the side surface  125  is greater than 90 degrees. When the cover lens  120  is made of a high hardness material such as glass or the like, the groove having the slope is more easily formed on the second layer  122  compared to the groove of which the shape is a cube during the cover lens processing. Therefore, the production yield of the cover lens is effectively enhanced. In some embodiments of the instant disclosure, the angle between the top surface  124  and the side surface  125  may be in a range from 95 degrees to 175 degrees or 100 degrees to 165 degrees. It should be noted that the top surface  124  and the side surface  125  mentioned above are only exemplary, and not intended to limit the instant disclosure. Readers of the instant disclosure should be flexible to choose the combination of specific angle or shape of the top surface  124  and the side surface  125  depending on the actual needs. 
     In some embodiments, the side surface  125  is a planar surface. In other embodiments, the side surface  125  may be a curved surface bent inwardly or outwardly. In other embodiments, the side surface  125  may be a concave curved surface or a convex curved surface. When the side surface  125  is a curved surface, the angle between the top surface  124  and the side surface  125  is defined to be an angle between the top surface and a line connecting one end of the side surface  125  connected to the top surface and one end of the side surface  125  connected to the second surface  122 . 
     In some embodiments, the fingerprint identification structure  130  is a capacitive fingerprint identification structure  130 . More specifically, the fingerprint identification structure  130  is a sensing electrode structure disposed in the groove  123  and a portion of the second surface  122 . More specifically, the fingerprint identification structure  130  is disposed on the top surface  124 , the side surface  125  and the portion of the second surface  122  connected to the side surface  125 . The fingerprint identification structure  130  disposed on the top surface  124  of the groove  123  is used for identifying the fingerprint of users. The fingerprint identification structure  130  disposed on the portion of the second surface  122  is used for connecting external lines. The fingerprint identification structure  130  disposed on the side surface  125  of the groove  123  is used for electrically connecting the fingerprint identification structure  130  disposed on the top surface  124  of the groove  123  and the fingerprint identification structure  130  disposed on the portion of the second surface  122 . 
     For instance, a method of forming the fingerprint identification structure  130  may include the following steps. First, a conductive layer is deposited on the top surface  124  and side surface  125  of the groove  123  and the portion of the second surface  122  connected to the side surface  125 . (The cover lens  120  compared to  FIG. 2  is inverted at this time. In other words, the second surface  122  is an upper surface, and the groove  123  is upward.) Next, the fingerprint identification structure  130  is formed by patterning the conductive layer. 
     Since the side surface  125  of the groove  123  is formed as a slope connecting the top surface  124  and the second surface  122 , the conductive layer is more easily formed on the side surface  125  of the groove  123  and the patterning process is easily performed. In addition, the fingerprint identification structure  130  is less prone to breakage and damage at the connection between the side surface  125  and the top surface  124 , and the side surface  125  and the second surface  122  because the side surface  125  of the groove  123  between the top surface  124  and the second surface  122  has a gentler slope. 
     In some embodiments, a touch device  100  further includes a display module  190  disposed under the touch sensing structure. Consequently, the touch sensing structure  110  and the display module  190  cooperatively perform the touch and display functions. Display module  190  may be a liquid crystal display module (LCM), a light emitting diode (LED) display module, an organic light emitting diode (OLED) display module or other display modules which may be bonded to the touch sensing structure. 
     Specifically, the touch sensing structure  110  is a single-layer touch sensing electrode structure formed on the cover lens  120 . In addition, the materials of the touch sensing structure  110  may be metal nano-wire, transparent metal oxide thin film, metal mesh or the like. 
     First, the touch sensing structure  110  is formed on the second surface  122 . (The cover lens  120  compared to  FIG. 2  is inverted at this time. In other words, the second surface  122  is an upper surface.) Subsequently, the cover lens  120  and the touch sensing structure  110  are disposed on the display module  190  during the process. 
     In some embodiments of instant disclosure, the cover lens  120  further has a side surface  126  connecting the first surface  121  and the second surface  122  (i.e., the first surface  121  and the second surface  122  are respectively the top surface and the bottom surface of the cover lens  120 , and the side surface  126  is located between the first surface  121  and the second surface  122 ). The touch device  100  further comprises a buffer layer  160  disposed on the side surface  126 . Specifically, the materials of the buffer layer  160  may be glue. More specifically, the glue may be a colloid which is flowing and sticky. The material of the glue is acrylic resin which is liquid at room temperature (e.g. 20-27° C.) and may be formed by curing such as ultraviolet curing. When the glue is liquid, the glue may be formed on the side surface  126  by injection molding, adhering, spraying, roller coating or the like. The viscosity of the glue may be in a range from 500 mPa·s to 1200 mPa·s, and the hardness of the glue after curing may be in a range from 70 D to 80 D (shore hardness). The maximum thickness T of the buffer layer  160  may be in a range from 0.03 μm to 0.2 μm, preferably from 0.08 μm to 0.12 μm. An outer surface of the buffer layer  160  is away from the side surface  126 , so that the buffer layer  160  may protect the cover lens  120  by buffering the external force. Alternatively, the cover lens  120  may have micro-cracks or gaps on the side surface  126  after processing, and the buffer layer  160  under a liquid state can perform the capillary action with the micro-cracks or gaps of the side surface  126  and repair the micro-cracks or gaps to enhance the strength of the cover lens  120 . Further, the glue having the features stated above is used for forming a buffer layer  160 , so that the buffer layer  160  are tightly and firmly bonded to the side surface  126  to enhance the impact resistance and crack resistance of the side surface  126 . As a result, a whole strength of the cover lens  120  and the touch device  100  are enhanced. Especially for the OGS(one glass solution), it may enhance the ability of the drop resistance and the impact resistance of the touch panel. 
     In some embodiments, the materials of the cover lens  120  are transparent and have high hardness. For instance, the materials of the cover lens  120  may be tempered glass, sapphire or polymethylmethacrylate (PMMA). The first surface  121  and the second surface  122  of the cover lens  120  are surfaces that undergo chemical or physical strengthening. Further, the side surface  126  of the cover lens  120  may also be a surface that undergoes chemical or physical strengthening. Therefore, the strength of the cover lens  120  is enhanced. The first surface  121  and the second surface  122  of the cover lens  120  may also be a curved surface, so that the cover lens  120  may be a three dimensional (3D) structure. 
       FIG. 3  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to some embodiments of the instant disclosure. The present embodiment is substantially the same as the foregoing embodiment, and the differences will be described hereafter. 
     A fingerprint identification structure  130  is an integrated circuit chip disposed under a top surface  124  of a groove  123  and in direct contact with a first mask layer  140  which covers the top surface  124  of the groove  123 . It should be noted that the embodiments of the fingerprint identification structure  130  mentioned above are only exemplary, but not intended to limit the instant disclosure. One of ordinary skill in the art of the instant disclosure should be flexible to choose the embodiments of the fingerprint identification structure  130  depending on the actual needs. 
     In some embodiments, the first mask layer  140  is an opaque adhesive material, so that the first mask layer  140  has shielding function and may fix the fingerprint identification structure in the groove  123  of the cover lens  120 . 
     In some embodiments, the fingerprint identification structure  130  does not have to be fixed in the groove  123  of the cover lens  120  by the first mask layer  140 . Alternatively, the fingerprint identification structure  130  may also be fixed in the groove  123  of the cover lens  120  by disposing auxiliary components, or by designing the size or shape of the groove  123  to fix the fingerprint identification structure  130  in the groove  123  of the cover lens  120 . 
       FIG. 4  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to some embodiments of the instant disclosure. The present embodiment is substantially the same as the embodiment of  FIG. 3 , and the major differences will be described hereafter. 
     In some embodiments, a first mask layer  140  only has shielding function. Accordingly, the touch device  100  further includes a first fixed layer  150  disposed between the fingerprint identification structure  130  and the first mask layer  140  to fix the fingerprint identification structure  130  in a groove  123  of a cover lens  120 . 
     In some embodiments, the material of the first fixed layer  150  may be a sticky colloid such as optical cement and glue. More specifically, the major material of the glue is acrylic resin which is liquid at room temperature and may be formed by curing such as ultraviolet curing. When the glue is liquid, the glue may be formed between the fingerprint identification structure  130  and the first mask layer  140  by injection molding, adhering, spraying, roller coating or the likes, and tightly and firmly bonds the fingerprint identification structure  130  and the first mask layer  140  after curing. The viscosity of the glue may be in a range from 500 mPa·s to 1200 mPa·s, the hardness of the glue after curing may be in a range from 70 D to 80 D (shore hardness), and the thickness may be in a range from 5 μm to 50 μm. Therefore, the first fixed layer  150  may enhance the strength of the cover lens  120  in the groove  123 , especially using the glue having the above features to form the first fixed layer  150  because of its viscosity and hardness which can further strengthen the strength of the cover lens  120  in the groove  123 . 
       FIG. 5  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to some embodiments of the instant disclosure. The present embodiment is substantially the same as the embodiment of  FIG. 4 , and the major differences will be described hereafter. 
     As shown in  FIG. 5 , a touch device  100  further includes a second fixed layer  170 . The second fixed layer  170  is disposed between a fingerprint identification structure  130  and a second mask layer  142 , and fills a groove  123  to fix the fingerprint identification structure  130  in the groove  123  of a cover lens  120 . 
     Specifically, the materials of a first fixed layer  150  may be a sticky colloid such as optical cement and glue. The major components and the forming method of the second fixed layer  170  are similar to the first fixed layer  150 , and hence not repeated herein. The second fixed layer  170  and the first fixed layer  150  may be connected to each other and disposed between the fingerprint identification structure  130  and the first mask layer  140 , and between the fingerprint identification structure  130  and the second mask layer  142 . 
     The second fixed layer  170  can tightly and firmly bond the fingerprint identification structure  130  and the first mask layer  140  after curing, so that there is no gap between the groove  123  and the fingerprint identification structure  130 . Therefore, the fixed layer  170  can firmly fix the fingerprint identification structure  130  in the groove  123  and further strengthen the strength of the cover lens  120  in the groove  123 . 
       FIG. 6  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to further another embodiment of the instant disclosure. The touch device  100  of the present embodiment is substantially the same as the touch device  100  of  FIG. 5 , and the major differences will be described hereafter. In the present embodiment, the second fixed layer  170  is disposed between a fingerprint identification structure  130  and a second mask layer  142 , and further covers the fingerprint identification structure  130 . Therefore, the second fixed layer  170  can protect the fingerprint identification structure  130  by buffering the external force, and reduce the scratch or damage of the fingerprint identification structure  130  caused by the external force during the manufacturing process. 
       FIG. 7  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to yet another embodiment of the instant disclosure. The touch device  100  of the present embodiment is substantially the same as the touch device  100  of  FIG. 5 , and the major differences will be described hereafter. In the present embodiment, a fingerprint identification structure  130  of the touch device  100  is in direct contact with a first mask layer  140 . In other words, there is no first fixed layer  150  between the fingerprint identification structure  130  and a top surface  124 , and the fingerprint identification structure  130  is fixed in a groove  123  by a second fixed layer  170 . In addition, the second fixed layer  170  may also be similar to the second fixed layer  170  in  FIG. 6 , and further cover the side surface and the button surface of the fingerprint identification structure  130 . 
     The fingerprint identification structure  130  is in direct contact with and covers the first mask layer  140 , so that a distance between the fingerprint identification structure  130  and the first surface  121  may be reduced in order to more improve sensitivity and accuracy of fingerprint identification. 
       FIG. 8  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to yet another embodiment of the instant disclosure. The touch device  100  of the present embodiment is substantially the same as the touch device  100  of  FIG. 3 , and the major differences will be described hereafter. The first mask layer  140  only has shielding function, the touch device  100  further includes a second fixed layer  170 , the fingerprint identification structure  130  is disposed on the side surface  125  by the second fixed layer  170 , and the fingerprint identification structure  130  is in direct contact with the first mask layer  140 . In other words, the second fixed layer  170  is disposed between the fingerprint identification structure  130  and the second mask layer  142 , merely disposed on the second mask layer  142 , (another portion of the second fixed layer is disposed on the first mask layer) and does not fill the groove  123 . 
     Specifically, the materials of the second fixed layer  170  may be a sticky colloid such as optical cement or glue. The major components and the forming method of the second fixed layer  170  are similar to the first fixed layer  150 , and hence not repeated herein. 
     The second fixed layer  170  can tightly and firmly bonds the fingerprint identification structure  130 , the first mask layer  140  and the second mask layer  142  after curing, and hence the second fixed layer  170  can firmly fix the fingerprint identification structure  130  in the groove  123 . In addition, the second fixed layer  170  has enough hardness and is disposed in the groove  123 , and hence may strengthen the strength of the cover lens  120  in the groove  123 . 
       FIG. 9  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to further another embodiment of the instant disclosure. The touch device  100  of the present embodiment is substantially the same as the touch device  100  of  FIG. 4 , and the major differences will be described hereafter. In the present embodiment, the touch device  100  includes a substrate  111  and a touch sensing layer  112 , the touch sensing layer  112  is disposed on a surface of the substrate  111 , and the substrate  111  is disposed between the cover lens  120  and the touch sensing layer  112 . In addition, the touch sensing structure  112  is a single-layer touch sensing electrode structure. 
     In a related manufacturing process, the touch sensing layer  112  is first formed on the substrate  111 , the substrate  111  and the touch sensing layer  112  formed on the substrate  111  are subsequently bonded to a second surface  122  through the substrate  111  side and located on a touch display area  121 T. Further, a display module  190  is bonded to the touch sensing layer  112 . 
       FIG. 10  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to yet another embodiment of the instant disclosure. The touch device  100  of the present embodiment is substantially the same as the touch device  100  of  FIG. 9 , and the major differences will be described hereafter. In the present embodiment, the touch sensing layer  112  is disposed on a substrate  111  and between a cover lens  120  and the substrate  111 . 
     In a related manufacturing process, the touch sensing layer  112  is first formed on the substrate  111 , the substrate  111  and the touch sensing layer  112  formed on the substrate  111  are subsequently bonded to a second surface  122  through the touch sensing layer  112  side, and a display module  190  is bonded to the substrate  111 . 
       FIG. 11  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to some embodiments of the instant disclosure. The touch device  100  of the present embodiment is substantially the same as the touch device  100  of  FIG. 4 , and the major differences will be described hereafter. In the present embodiment, a touch sensing structure  110  includes substrate  111 , an upper touch sensing layer  113  and a lower touch sensing layer  114 . The upper touch sensing layer  113  and the lower touch sensing layer  114  are respectively disposed on two opposite sides of the substrate  111 , and the upper touch sensing layer  113  is located between the cover lens  120  and the substrate  111 . 
     In a related manufacturing process, the upper touch sensing layer  113  and the lower touch sensing layer  114  are first respectively formed on the opposite sides of the substrate  111 . Subsequently, the upper touch sensing layer  113  is bonded to the second surface  122 , and a display module  190  is bonded to the lower touch sensing layer  114 . 
     In some embodiments, the electrodes of the upper touch sensing layer  113  and lower touch sensing layer  114  are alternately disposed. For instance, the electrode of the upper touch sensing layer  113  is disposed in a vertical direction, and the electrode of the lower touch sensing layer  114  is in a horizontal direction. The electrode of the upper touch sensing layer  113  may be a routing at the driving end, and the electrode of the lower touch sensing layer  114  may be a routing at the receiving end. Alternatively, the electrode of the upper touch sensing layer  113  may be a routing at the receiving end, and the electrode of the lower touch sensing layer  114  may be a routing at the driving end. 
       FIG. 12  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to yet another embodiment of the instant disclosure. The touch device  100  of the present embodiment is substantially the same as the touch device  100  of  FIG. 11 , and the major differences will be described hereafter. In the present embodiment, a touch sensing structure  110  includes an upper touch sensing layer  113 , a lower touch sensing layer  114 , an upper substrate  115  and a lower substrate  116 . The lower touch sensing layer  114  is disposed on the lower substrate  116 , the upper touch sensing layer  113  is disposed on the upper substrate  115 , the upper substrate  115  is located between the upper touch sensing layer  113  and the lower touch sensing layer  114 , and the upper touch sensing layer  113  is located between the cover lens  120  and the upper substrate  115 . 
     In a related manufacturing process, the upper touch sensing layer  113  and the lower touch sensing layer  114  are first respectively formed on a side of the upper substrate  115  and the lower substrate  116 . The upper touch sensing layer  113  is subsequently bonded to a second surface  122 , and the lower touch sensing layer  114  is bonded to the upper substrate  115 . Further, a display module  190  is bonded to the lower substrate  116 . 
     It should be noted that other embodiments are not limit to the above description. In other embodiments, as long as the upper touch sensing layer  113  and the lower touch sensing layer  114  are insulated from each other, the location of the upper touch sensing layer  113  and the upper substrate  115  may be exchanged, and the location of the lower touch sensing layer  114  and the lower substrate  116  may also be exchanged. 
     As discussed above with reference to  FIG. 9 through 12 , the substrate  111 , the upper substrate  115  and the lower substrate  116  are made of transparent insulated materials such as glass or plastic film. The plastic film includes polyimide (PI), polypropylene (PP), polystyrene (PS), acrylonitrile—butadiene—styrene (ABS), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polycarbonate (PC), polyethylene (PE), polymethyl methacrylate (PMMA), polytetrafluoroethylene (PTFE) or the like. The touch sensing layer  112 , the upper touch sensing layer  113  and the lower touch sensing layer  114  are made of highly transparent conductive materials such as metal nano-wires, transparent metal oxide thin film, metal mesh or the like. 
     In addition, in some embodiments of the instant disclosure, the touch device  100  further includes a metal ring (not shown) disposed in the groove  123  and surrounding the fingerprint identification structure  130 . The metal ring may be used for detecting the touch object, starting the fingerprint structure  130  and improving the signal-to-noise ratio. 
     The signal-to-noise ratio may be defined as the ratio of the power of a signal (meaningful information) and the power of background noise (unwanted signal). Embodiments of this disclosure are not limited thereto. The person having ordinary skill in the art can make proper modifications to the definition of the signal-to-noise ratio depending on the actual application. 
       FIG. 13  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to some embodiments of the instant disclosure. The present embodiment is substantially the same as the embodiment of  FIG. 3 , and the major differences will be described hereafter. 
     A cover lens  120  of the present embodiment is made of, for example, glass. A groove  123  disposed on a second surface  122  of the cover lens  120  is mainly formed by using a cutting tool to perform multiple processing, so that many minor marks and cracks occur. In the prior art, wool felt is typically used for performing secondary polishing to repair the marks and the cracks on the glass. However, the corners and edges of the groove cannot be polished by wool felt, and using the wool felt is likely to polish the flat top surface  124  of the groove  123  into an arc, which changes the external appearance of the groove  123 . In the present disclosure, a first optical repair layer  180  is further disposed between the top surface  124  of the groove  123  and a first mask layer  140 . The main functions of the first optical repair layer  180  are repairing the marks and minor cracks of the groove  123 , which is caused by the surface treatment process, reducing fogging and modifying marks. Consequently, the surface of the groove becomes transparent and flat, the optical performance is recovered, and the appearance is improved. 
     Specifically, the material of the first optical repair layer  180  is a transparent organic gel, a transparent ink or a semi-transparent ink. Due to color contrast between the marks and the cracks of the groove  123  and the first mask layer  140 , the marks and the cracks are more obvious. Therefore, the first optical repair layer  180  of the present embodiment is made of transparent organic gel, transparent ink or semi-transparent ink, so that the first optical repair layer  180  can repair the gaps of the marks and the cracks and further improve visual appearance. When the first optical repair layer  180  is made of transparent organic gel, the transparent organic gel has a certain viscosity, and hence the adhesion of the first mask layer  140  to the cover lens  120 , which is made of glass, can be improved. 
     The materials of the organic gel are selected from methyltrichlorosilane, dimethyldichlorosilane, phenyltrichlorosilane, diphenyldichlorosilane, methylphenyldichlorosilane, acrylate, silicone, epoxy resin, urethane resin or a combination thereof. 
     A method of manufacturing the first optical repair layer  180  of the present embodiment is spraying or pad printing. In the pad printing case, the optical repair material, which is viscous liquid having a certain degree of fluidity, is first printed on the top surface  124  of the groove  123 . The optical repair material can penetrate the gaps of the marks and the cracks of the top surface  124  because of its material and fluidity, and the top surface  124  is restored to the original optical performance after filling the gaps. Drying or baking step is performed after pad printing to form the first optical repair layer  180 . 
     The thickness of the first optical repair layer  180  of the present embodiment is in a range from 1 μm to 100 μm. In some embodiments, the range is from 30 μm to 70 μm. As a result, the first optical repair layer  180  can guarantee a sufficient amount to fill the gaps of the marks and the cracks, but also ensure that the top surface  124  of the groove  123  remains flat, and also maintain the effective operation of the fingerprint identification within this thickness range. 
       FIG. 14  is a cross-sectional view of a touch device  100  taken along line  2  shown in  FIG. 1  according to some embodiment of the instant disclosure. The present embodiment is substantially the same as the embodiment of  FIG. 13 , and the major differences will be described hereafter. In the present embodiment, the touch device  100  has a second optical repair layer  182  disposed between a side surface  125  of a groove  123  and a second mask layer  142 . 
     The second optical repair layer  182  of the present embodiment can repair marks and cracks, which are generated due to processing, on the side surface  125  of the groove  123  as discussed above, and simultaneously provide better adhesion of the second mask layer  142  formed on the side surface  125 . The material, the process and the thickness of the second optical repair layer  182  are described with reference to the illustration of  FIG. 13 , and hence not repeated herein. 
     Additional information will be described hereafter. In the actual design, the optical properties of the materials of the first optical repair layer  180  and the second optical repair layer  182  have to match the actually designed color of the first mask layer  140  and the second mask layer  142  of touch device  100  as the main consideration, in order to comply with desired color contrast between the first mask layer  140  and the second mask layer  142  according to the embodiments of  FIGS. 13 and 14 . 
     In various embodiments of the instant disclosure, Since the first mask layer and the second mask layer, which have different color, respectively cover the top surface and the side surface of the groove, the first mask layer and the second mask layer have more uniform shielding for opaque elements such as the fingerprint identification structure under the first mask layer and the second mask layer, and simultaneously prevent the light leaking from the groove, especially from the side surface of the groove. Since the color of the first mask layer and the second mask layer are different, the color difference between the first mask layer and the second mask layer may be fully used to enhance their color contrast, in order to improve the poor visual appearance of the touch device caused by the situation that the shielding cannot be uniform due to the different reflection angles of light on the side surface and top surface of the groove of the same color mask layer. In addition, the color of the second mask layer and the first mask layer are different, so that the second mask layer is formed as the fingerprint labeled area to specifically indicate the location of the fingerprint identification area, and further enhance the convenience of use of the touch device. 
     The above descriptions are only the preferred embodiments of the instant disclosure, but not intended to limit the instant disclosure. Any modification, equivalent substitution, improvement and so on within the spirit and principles of the instant disclosure should be included the scope of protection of the instant disclosure.