Abstract:
The present invention discloses an input device with luminous patterns including an input interface and a backlight module. The backlight module includes a light source and a light guide plate. The input interface has a predetermined light shading rate and at least one pattern formed on the light guide plate. When the light source is turned off, the light passing through the light guide plate is too weak to show the pattern. When the light source is turned on, the luminous pattern is shown. One base plate of the input interface is made from a mixture of transparent plastic particles and light shading particles, and the at least one pattern is formed of the micro light guide structures. The present invention provides the advantages of increasing the light source utilization rate, reducing costs, simplifying the manufacture process, improving the shading uniformity, reducing the thickness of input device and decreasing abrasion.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention generally relates to an input device, and more particularly to an input device with luminous patterns. 
       BACKGROUND OF THE INVENTION 
       [0002]    Applications of the touch input device is quite extensive. Currently, some of the touch input device which is commercially available has two kinds of different input modes simultaneously. Herein, the touch input device has a backlight module, and a first input mode is provided when the backlight module is turned on and thus the touch input device shows a predetermined pattern, while a second input mode is provided when the backlight module is turned off and thus the predetermined pattern is not shown. In another word, users may recognize which input mode it is switched to currently by whether the pattern is shown or not, and then input signals according to the current input mode. For example, when the backlight is turned off, an appearance of the touch input device is presented as a whole black state and the input mode is preset a mode for controlling a mouse cursor. At this time, users can implement motions of moving the mouse cursor and clicking according to the appearance of the touch input device is presented as the whole black state. On the contrary, when the backlight is turned on, a luminous keyboard is presented on the touch input device and the input mode is preset a mode for controlling a keyboard. At this time, users can input letters and symbols by the touch input device according to the appearance is presented as the luminous keyboard pattern. Therefore, one of the design points of such a backlight touch input device is how to ensure that the pattern is not shown when the backlight is turned off, but the luminous pattern is shown only when the backlight is turned on, so as to avoid confusing users. 
         [0003]      FIG. 1  illustrates a structural side view of a conventional backlight input device. Referring to  FIG. 1 , the conventional backlight input device  1  comprises an input interface  11 , a backlight module  12  and a Mylar plate  19 , wherein a bottom-up sequence thereof is the input interface  11 , the backlight module  12  and the Mylar plate  19 . Herein, the backlight module  12  comprises a light source  13  and a light guide plate  14 , while a lower surface of the Mylar plate  19  is disposed with a plurality of patterns  17 . The patterns  17  are printed by using a light transmissive black printing ink with a light shading rate about 98%, and the regions outside the patterns  17  are printed by using an opaque black printing ink to form a light shading layer  18 . Thus, the light can pass through the surface of the Mylar plate  19  from where is printed with the patterns  17  only, but is unable to pass through from the regions outside the patterns  17 . When the backlight module  12  of the backlight input device  1  is turned off, there is still faint light entering into the backlight input device  1  from the environment. However, the light quantity of the 2% faint light coming from the environment and passing through the regions printed with the patterns  17  is too weak to be distinguished by human eyes due to the light shading rate of the patterns  17  is 98%, and thus the patterns  17  would not be shown on the Mylar plate  19 , i.e. users would not see the patterns  17 . In contrast, when the backlight module  12  of the backlight input device  1  is turned on, there is a significant amount of light entering into the backlight input device  1 . At this time, a difference of the light quantities between the light passing through the regions printed with the patterns  17  and the light coming from the environment is enough to be distinguished by human eyes although there is only 2% light passing through the Mylar plate  19 , and thus users can recognize the inputting locations indicated by the luminous patterns  17  on the backlight input device  1 . 
         [0004]      FIG. 2  illustrates a structural side view of another conventional backlight input device  2 . Referring to  FIG. 2 , the other conventional backlight input device  2  comprises an input interface  21 , a backlight module  22  and a surface layer  29 , wherein a bottom-up sequence thereof is the input interface  21 , the backlight module  22  and the surface layer  29 . An upper surface of the surface layer  29  is printed with a shading printing ink, so as to form a light shading layer  28  having a predetermined light shading rate. The backlight module  22  comprises a light source  23  and a light guide plate  24 . A lower surface  26  of the light guide plate  24  has at least a pattern  27  formed from micro structures of light guide arranged densely. The destruction of total reflection may happen due to incident angles of the light are capable of being varied by the micro structures of light guide in the light guide plate  24 , and thus the light may be refracted to pass through the light guide plate  24 . Therefore, when the light quantity in the light guide is sufficient, the light quantity reveals from the top side of the micro structures of light guide is enough to be distinguished by human eyes, and thus the pattern  27  is visible. When the backlight module  22  of the backlight input device  2  is turned off, the light quantity entering into the backlight input device  2  is not sufficient, and thus the pattern  27  would not be shown due to the light quantity passing through the light shading layer  28  is not enough, i.e. users would not see the pattern  27 . In contrast, when the backlight module  22  is turned on, the light passing through the light shading layer  28  via the micro structures of light guide is enough to show the luminous pattern  27 . 
         [0005]    However, both of the two conventional backlight input devices have restrictions in applications. For ensuring that the patterns  17  are not shown when the backlight module  12  is turned off, the conventional backlight input device  1  must use the light transmissive black printing ink with the light shading rate about 98% to print the patterns  17 , and thus utilization efficiency of the backlight is only 2%. Therefore, the conventional backlight input device  1  must be equipped with the light source  13  with a high brightness, so as to provide the sufficient light quantity to pass through the light shading layer  28  to show the pattern  27  when the backlight module  22  is turned on, and thus the use cost is increased. In addition, the light shading manners of both of the conventional backlight input device  1  and the conventional backlight input device  2  are disposing a Mylar plate  19  or a surface layer  29  over the light guide plate  24  which is coated with light shading materials on the surface thereof by a screen printing process. However, the screen printing process for coating the light shading materials is complicated, and thus the fabricating cost is further increased as well. Furthermore, the light shading materials coated on the surface of the Mylar plate  19  or the surface layer  29  are likely to fall off due to a long term use or wear and tear during transportation, and thus the life time of the backlight input device may be reduced. Accordingly, it is desired to provide a novel backlight input device to resolve the disadvantages of the conventional backlight input devices. 
       SUMMARY OF THE INVENTION 
       [0006]    The present invention is directed to an input device with luminous patterns, which has higher backlight utilization efficiency. 
         [0007]    The present invention is also directed to an input device with luminous patterns, which is fabricated by a simpler process and thinner and lighter. 
         [0008]    The present invention is further directed to an input device with luminous patterns, wherein the light shading materials thereof is not likely to fall off due to a long term use or wear and tear during transportation. 
         [0009]    The present invention is also directed to an input device with luminous patterns, wherein the light shading effect thereof is more uniform. 
         [0010]    In a preferred embodiment, the present invention provides an input device with luminous patterns comprising:
       an input interface, having a predetermined light shading rate; and   a backlight module, disposed under the input interface, wherein the backlight module comprises:
           a light source; and   a light guide plate, having at least a pattern, and the at least a pattern disposed on an upper surface or a lower surface of the light guide plate, wherein when the light source is turned off, the at least a pattern is unable to be shown due to a brightness of the light guide plate is lower than the predetermined light shading rate.   
               
 
         [0015]    In a preferred embodiment, the input interface comprises at least a substrate, and the at least a substrate is doped with a plurality of light shading particles, and thus the input interface has the predetermined light shading rate, wherein the predetermined light shading rate is ranged between 75% and 80%. 
         [0016]    In a preferred embodiment, the at least a substrate is a glass plate or a plastic plate. 
         [0017]    In a preferred embodiment, the input interface is a light transmissive resistive touch sensor. 
         [0018]    In a preferred embodiment, the input interface further comprises a protective layer disposed over the at least a substrate, and the protective layer is doped with a plurality of light shading particles, and thus the input interface has the predetermined light shading rate, and the predetermined light shading rate is ranged between 75% and 80%. 
         [0019]    In a preferred embodiment, the protective layer is a glass plate or a plastic plate. 
         [0020]    In a preferred embodiment, the input interface is a light transmissive surface capacitive touch sensor, a light transmissive inner capacitive touch sensor or a light transmissive projected capacitive touch sensor. 
         [0021]    In a preferred embodiment, the at least a pattern is formed from a plurality of micro structures of light guide arranged densely, and the plurality of micro structures of light guide are a plurality of mesh points or a plurality of micro structures arranged densely. 
         [0022]    In a preferred embodiment, the input device with luminous patterns of the present invention further comprises a black base plate for absorbing a light beam, wherein the black base plate provides a black background when the backlight module is turned off, and thus the at least a pattern is unable to be shown, and the at least a pattern of the light guide plate is a button pattern, a keyboard pattern or a pattern of an interactive component. 
         [0023]    In a preferred embodiment, the present invention further provides an input device with luminous patterns comprising:
       an input interface;   a backlight module, comprising:
           a light source; and   a light guide plate, having at least a pattern, and the at least a pattern disposed on an upper surface or a lower surface of the light guide plate; and   
           a protective layer, disposed over the backlight module, and the protective layer having a predetermined light shading rate, wherein when the light source is turned off, the at least a pattern is unable to be shown due to a brightness of the light guide plate is lower than the predetermined light shading rate.       
 
         [0029]    In a preferred embodiment, the protective layer is doped with a plurality of light shading particles, and thus the input interface has the predetermined light shading rate, and the predetermined light shading rate is ranged between 75% and 80%. 
         [0030]    In a preferred embodiment, the protective layer is a glass plate or a plastic plate. 
         [0031]    In a preferred embodiment, the input interface is disposed under the backlight module, and the input interface is an opaque printed circuit board capacitive touch sensor. 
         [0032]    In a preferred embodiment, the input device with luminous patterns of the present invention further comprises a black printing ink layer disposed on an upper surface of the input interface for absorbing a light beam, wherein the black printing ink layer is used as a black background when the backlight module is turned off, and thus the at least a pattern is unable to be shown, and the at least a pattern is a button pattern, a keyboard pattern or a pattern of an interactive component. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0033]      FIG. 1  illustrates a structural schematic view of an appearance of a conventional backlight input device. 
           [0034]      FIG. 2  illustrates a structural schematic view of an appearance of another conventional backlight input device. 
           [0035]      FIG. 3  illustrates a structural side view of an input device with luminous patterns according to a first preferred embodiment of the present invention. 
           [0036]      FIG. 4  illustrates a structural schematic view of the backlight module of the input device with luminous patterns being turned off according to the first preferred embodiment of the present invention. 
           [0037]      FIG. 5  illustrates a structural schematic view of the backlight module of the input device with luminous patterns being turned on according to the first preferred embodiment of the present invention. 
           [0038]      FIG. 6  illustrates a structural side view of a backlight module of an input device with luminous patterns according to a second preferred embodiment of the present invention. 
           [0039]      FIG. 7  illustrates a structural side view of a backlight module of an input device with luminous patterns according to a third preferred embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0040]    In view of the defects of the conventional arts, the present invention provides an input device with luminous patterns.  FIG. 3  illustrates a structural side view of an input device with luminous patterns according to a first preferred embodiment of the present invention. Referring to  FIG. 3 , the input device  3  with luminous patterns comprises an input interface  31 , a backlight module  32  and a black base plate  33 , wherein a sequence from top to bottom thereof is the input interface  31 , the backlight module  32  and the black base plate  33 . The input interface  31  comprises a first substrate  311 , a second substrate  312 , a first transparent conducting film  313 , a second transparent conducting film  314 , a micro spot space layer  315  and a connector  316 . The first substrate  311  is located over the second substrate  312 , the first transparent conducting film  313  is disposed on a lower surface  3111  of the first substrate  311 , and the second transparent conducting film  314  is disposed on an upper surface  3121  of the second substrate  312 . In addition, the micro spot space layer  315  is located between the first substrate  311  and the second substrate  312  for separating the first transparent conducting film  313  on the first substrate  311  and the second transparent conducting film  314  on the second substrate  312 , so as to avoid the first substrate  311  contacting with the second substrate  312 . Furthermore, the connector  316  connects with the first transparent conducting film  313  for outputting a signal. In the present preferred embodiment, the input interface  31  is a light transmissive resistive touch sensor, the first substrate  311  is a film, the second substrate  312  is a plastic plate, and both of the first transparent conducting film  313  and the second transparent conducting film  314  are made from indium tin oxide (ITO). 
         [0041]    In the input interface  31 , the second substrate  312  is formed from uniformly mixing transparent plastic particles with a plurality of light shading particles  34  in a specific proportion first and then processed with an injection molding process, so as to let the second substrate  312  have a predetermined light shading rate and a uniform light shading result. In the present preferred embodiment, the predetermined light shading rate of the second substrate  312  is ranged between 75% and 80%. 
         [0042]    In the  FIG. 3 , the backlight module  32  comprises a light source  321  and a light guide plate  322 , wherein the light source  321  is capable of generating light beams and located at a side of the light guide plate  322 , while the light guide plate  322  is capable of guiding the transmission of the light beams. In addition, the light guide plate  322  has at least a pattern  3221  disposed on an upper surface  3222  of the light guide plate  322 . Each of the patterns  3221  as illustrated in  FIG. 3  is formed from a plurality of micro structures of light guide arranged densely, and each of the plurality of micro structures of light guide may be a plurality of micro structures (such as micro lenses, v-cuts, etc.) arranged densely or a plurality of mesh points arranged densely. Herein, the micro structures of light guide for forming the patterns  3221  are used for varying incident angles of a partial light inside the light guide plate  322 , and thus the partial light may be refracted to pass through the light guide plate  322  due to the total reflection paths of the partial light are changed. Therefore, the light reveals from the top side of the micro structures of light guide, so as to present the luminous patterns  3221 . In the present preferred embodiment, the light source  321  is a light emitting diode (LED), and each of the patterns  3221  is a function button, a standard keyboard pattern, or a pattern of an interactive component of an operating system (OS) of the input device. For example, the function button thereof is a pattern of a power button, while the pattern of the interactive component of the OS of the input device is a pattern of an application program displayed on a desktop of a computer. 
         [0043]    Referring to  FIG. 4  and  FIG. 5  together herein after,  FIG. 4  illustrates a structural schematic view of the backlight module of the input device with luminous patterns being turned off according to the first preferred embodiment of the present invention, and  FIG. 5  illustrates a structural schematic view of the backlight module of the input device with luminous patterns being turned on according to the first preferred embodiment of the present invention. As illustrated in  FIG. 4 , when the backlight module  32  of the input device  3  with luminous patterns is turned off, the light source  321  is inactivated and not to generate any light beam, but only the faint light coming from the ambient environment is able to enter into the light guide plate  322  via the input interface  31 . In an instance of the predetermined light shading rate of the input interface  31  is ranged between 75% and 80%, there is 75% to 80% of the faint light entered into the input interface  31  being absorbed by the plurality of the light shading particles  34 , and the rest of the faint light about 20% to 25% is incident toward the light guide plate  322  when the rest of the faint light about 20% to 25% reaches the micro structures of light guide on the upper surface  3222  of the light guide plate  322 . Since the light transmitted in different directions is incident to the micro structures of light guide with different incident angles, there is about a half of the light being refracted and then transmitted toward a bottom side of the light guide plate  322 , and thus there is only about 10% of the faint light being reflected and then transmitted toward the input interface  31 . The plurality of light shading particles  34  of the input interface  31  are capable of further absorbing some more light during the light being reflected, and thus there is only about 2% of the faint light revealing from the top of the input interface  31 . Hence, the patterns  3221  would not be presented from the top of the input interface  31 , i.e. users would not see the patterns  3221 . In addition, the black base plate  33  located under the backlight module  32  is used as a black background when the backlight module  32  is turned off due to the black base plate  33  is capable of absorbing light beams, and thus the patterns  3221  is unable to be shown. 
         [0044]    As illustrated in  FIG. 5 , when the backlight module  32  is turned on and thus the light source  321  is turned on, a significant amount of light provided by the light source  321  enters into the light guide plate  322  from a side surface thereof. Herein, when the light beams are transmitted to the patterns  3221  formed from the micro structures of light guide, the light beams are transmitted toward the upper surface  3222  of the light guide plate  322  due to the total reflection path is destroyed by the micro structures of light guide. When the light beams enters into the input interface  31 , there is about 75% to 80% of the light beams being absorbed by the light shading particles  34  in the input interface  31 , and thus there is about 20% to 25% of the light beams passing through the light guide plate  322 , so as to present the luminous patterns  3221 . Therefore, users can see the luminous patterns  3221  as illustrated in  FIG. 5 . 
         [0045]    It should be noted that for achieving the requirement of not to show the patterns  17  when the backlight is turned off, the conventional backlight input device  1  must choose the light transmissive black printing ink with the light shading rate about 98% to print the patterns  17 , and thus most of the faint light coming from the environment and entered into the Mylar plate  19  is absorbed by the black printing ink of the Mylar plate  19 . Hence, only about 2% of the faint light remains to reveal from the top of the Mylar plate  19 , and thus the patterns  17  are too dark to be distinguished by human eyes. However, it is result a disadvantage of that the utilization efficiency of the backlight is only about 2% when the light source is turned on due to the light transmissive rate of the light transmissive black printing ink used for printing the patterns  17  is only 2%. Accordingly, the conventional backlight input device  1  must be equipped with the light source with higher brightness, and thus the electric power consumption and the operation cost are increased. 
         [0046]    In the present preferred embodiment, the second substrate  312  of the input interface  31  is formed by first uniformly mixing the transparent plastic particles with the plurality of light shading particles  34  and then processing them with the injection molding process, and the patterns  3221  are formed by densely arranging the micro structures of light guide on the upper surface  3222  of the light guide plate  322 . Therefore, the light quantity of the faint light is absorbed by the plurality of light shading particles  34  in the input interface  31  after the faint light coming from the environment enters into and is reflected out of the input interface  31  if the backlight module  32  is turned off. In addition, only about a half of the light is capable of revealing from the top of the input interface  31  due to the light has different light incident angles. Therefore, after the faint light from the environment enters into the input device  3  with luminous patterns, the light quantity thereof is reduced continuously since the light is absorbed and reflected again and again during the light is transmitted. Hence, it is able to achieve the requirement of that not to show the patterns  3221  when the backlight module  32  is turned off by using the input interface  31  with the light shading rate about 80%, and the utilization efficiency of the backlight module  32  can reach to about 20% when the backlight module  32  is turned on. Accordingly, it is able to achieve less power consuming, more power saving and more cost reduction by using the light source with lower brightness and lower manufacturing cost. 
         [0047]    Moreover, according to the conventional backlight input device  2 , the light shading printing ink is printed on the surface of another surface layer by using the screen printing process, wherein the screen printing process needs to process a plurality of steps of screen plate fabrication comprising original screen plate fabrication, original screen plate cleanup, emulsion coating, plate burning, plate washout, imaging and so on first, to put the imaged screen plate on the surface layer for scraping and printing thereafter, and then to process an air drying process. Hence, the shading printing inks are not likely to be printed uniformly due to problems such as residue of shading printing inks, flatness of the scraper, flatness of a platform, solidness of printing ink molecules and so on, so as to generate a disadvantage of uneven light shading result. Herein, the screen printing process is printing the light shading materials on the surface of an object and thus the light shading materials are likely to fall off due to a long term use or wear and tear during transportation. However, in the input device  3  with luminous patterns of the present invention, the input interface  31  is formed by first uniformly mixing the transparent plastic particles with the plurality of light shading particles  34  and then processing them with the injection molding process, so that it is able to reach the advantages of significantly simplifying the process of combining the input interface  31  with the light shading materials, reducing the unevenness of the distribution of the light shading materials, and avoiding the light shading materials fallen off due to a long term use or wear and tear during transportation. 
         [0048]    In the present preferred embodiment, the input interface  31  is a light transmissive resistive touch sensor, and the first substrate  311  is a film, while the second substrate  312  is a glass plate. In the other preferred embodiments, the first substrate and the second substrate may further be practiced by various combinations, such as the first substrate is a film and the second substrate is a glass plate, the first substrate is a bi-layers film and the second substrate is a plastic plate or a glass plate, the first substrate is a plastic plate or a glass plate and the second substrate is plastic plate or a glass plate and so on. Herein, only the plastic plate and the glass plate may be formed by mixing the transparent plastic particles or the transparent glass particles with the plurality of light shading particles in a specific proportion uniformly first and then processing them with the injection molding process, so as to form the first substrate of the second substrate. 
         [0049]    In addition, the present invention further provides a second preferred embodiment.  FIG. 6  illustrates a structural side view of a backlight module of an input device with luminous patterns according to a second preferred embodiment of the present invention. Referring to  FIG. 6 , the input device  4  with luminous patterns comprises an input interface  41 , a backlight module  42  and a black base plate  43 , and a sequence from top to bottom thereof is the input interface  41 , the backlight module  42  and the black base plate  43 . The input interface  41  comprises a substrate  411 , a protective layer  412 , a first transparent conducting film  413 , a second transparent conducting film  414 , a first insulating layer  415 , a second insulating layer  416  and a metal conducting wire  417 . The first transparent conducting film  413  is disposed on an upper surface  4111  of the substrate  411 , the first insulating layer  415  is disposed on an upper surface  4131  of the first transparent conducting film  413  and capable of protecting the first transparent conducting film  413 , and the protective layer  412  is disposed above the first insulating layer  415 . The second transparent conducting film  414  is disposed on a lower surface  4112  of the substrate  411 , the metal conducting wire  417  connects to the second transparent conducting film  414  and capable of outputting a signal, and the second insulating layer  416  is disposed under the metal conducing wire  417  and capable of protecting the second transparent conducting film  414 . In the present preferred embodiment, the input interface  41  is a light transmissive projected capacitive touch sensor, each of the substrate  411  and the protective layer  412  is a glass plate, both of the first transparent conducting film  413  and the second transparent conducting film  414  are made from ITO, and both of the first insulating layer  415  and the second insulating layer  416  are made from silicon dioxide. 
         [0050]    The protective layer  412  is disposed over the input interface  41 , and the protective layer  412  is formed by uniformly mixing transparent glass particles with a plurality of light shading particles  45  in a specific proportion first and then processed with an injection molding process, so as to let the protective layer  412  have a predetermined light shading rate and a uniform light shading result. In the present preferred embodiment, the predetermined light shading rate of the protective layer  412  is ranged between 75% and 80%. 
         [0051]    In the  FIG. 6 , the backlight module  42  comprises a light source  421  and a light guide plate  422 , wherein the light source  421  is capable of generating light beams and located at a side of the light guide plate  422 , while the light guide plate  422  is capable of guiding the transmission of the light beams. In addition, the light guide plate  422  has at least a pattern  4221  disposed on a lower surface  4222  of the light guide plate  422 , and the black base plate  43  located under the backlight module  42  is capable of providing a better light shading result when the backlight module  42  is turned off. 
         [0052]    The present preferred embodiment is substantially similar to the first preferred embodiment, except that a top side of the substrate  411  of the input interface  41  of the present preferred embodiment is further disposed with an additional protective layer  412 , and the patterns  4221  of the present preferred embodiment is disposed on the lower surface  4222  of the light guide plate  422 . Herein, the protective layer  412  is formed by mixing transparent glass particles with a plurality of light shading particles  45  uniformly in a specific proportion first and then processed with an injection molding process, and thus the protective layer  412  has advantages of light shading and protection providing. Hence, the effects resulted from the present preferred embodiment and the first preferred embodiment are substantially the same, except that the light shading effects of the two embodiments are slightly different due to the sequences of the faint light in the ambient environment passing through the micro structures of light guide and the light shading particles are different after the faint light is incident into the input device with luminous patterns. Besides, the other portions of the present preferred embodiment are substantially the same as that of the first preferred embodiment, and thus the detail descriptions thereof are omitted herein. 
         [0053]    In the present preferred embodiment, the input interface  41  is a light transmissive capacitive touch sensor, and each of the substrate  411  and the protective layer  412  is a glass plate. In the other preferred embodiments, the substrate can be a plastic plate and the protective layer can be a plastic plate, the substrate can be a plastic plate and the protective layer can be a glass plate, or the substrate can be a glass plate and the protective layer can be a plastic plate. In addition, the input interface can be a light transmissive resistive touch sensor, a light transmissive surface capacitive touch sensor or a light transmissive inner capacitive touch sensor. 
         [0054]    It should be noted that the protective layer  412  is formed by uniformly mixing transparent glass particles with a plurality of light shading particles  45  in a specific proportion first and then processed with an injection molding process, and thus the protective layer  412  has advantages of light shading and protection providing. However, in the other preferred embodiments, the substrate may be formed by uniformly mixing transparent glass particles with a plurality of light shading particles in a specific proportion first and then processed with an injection molding process as well, so as to let the substrate also have advantages of light shading and protection providing. 
         [0055]    Moreover, the present invention further provides a third preferred embodiment.  FIG. 7  illustrates a structural side view of a backlight module of an input device with luminous patterns according to a third preferred embodiment of the present invention. Referring to  FIG. 7 , the input device  5  with luminous patterns comprises an input interface  51 , a backlight module  52 , a protective layer  53  and a black printing ink layer  54 , and a sequence from top to bottom thereof is the protective layer  53 , the backlight module  52 , the black printing ink layer  54  and the input interface  51 . In the present preferred embodiment, the input interface  51  is an opaque printed circuit board (PCB) capacitive touch sensor. 
         [0056]    The protective layer  53  is disposed over the input interface  51  and the backlight module  52 , and the protective layer  53  is formed by uniformly mixing transparent plastic particles with a plurality of light shading particles  55  in a specific proportion first and then processed with an injection molding process, so as to let the protective layer  53  have a predetermined light shading rate and a uniform light shading result. In the present preferred embodiment, the predetermined light shading rate of the protective layer  53  is ranged between 75% and 80%, and the protective layer  53  is a plastic plate. 
         [0057]    In the  FIG. 7 , the backlight module  52  comprises a light source  521  and a light guide plate  522 , wherein the light source  521  is capable of generating light beams and located at a side of the light guide plate  522 , while the light guide plate  522  is capable of guiding the transmission of the light beams. In addition, the light guide plate  522  has at least a pattern  5221  disposed on an upper surface  5222  of the light guide plate  522 , and the black printing ink layer  54  is disposed on an upper surface of the input interface  51 . The black printing ink layer  54  is capable of absorbing the light beams and may be used as a black background when the backlight module  52  is turned off, and thus the patterns  5221  are unable to be shown. Herein, the black printing ink layer  54  is formed by processing an ink printing technology to uniformly print the black printing ink on the upper surface of the input interface  51 . 
         [0058]    The present preferred embodiment is substantially similar to the second preferred embodiment, except that the backlight module  52  of the present preferred embodiment is disposed between the input interface  51  and the protective layer  53 , and the patterns  5221  of the present preferred embodiment is disposed on the upper surface  5222  of the light guide plate  522 . Hence, the effects resulted from the present preferred embodiment and the second preferred embodiment are substantially the same, except that the light shading effects of the two embodiments are slightly different due to the sequences of the faint light in the ambient environment passing through the micro structures of light guide and the light shading particles are different after the faint light is incident into the input device with luminous patterns. Besides, the other portions of the present preferred embodiment are substantially the same as that of the second preferred embodiment, and thus the detail descriptions thereof are omitted herein. 
         [0059]    In the third preferred embodiment of the present invention, the backlight module  52  is located under the input interface  51 , and thus a disposing sequence of the touch sensor and the light guide plate from top to bottom may be properly adjusted according to the properties thereof. Besides, the protective layer  53  in the present preferred embodiment is a plastic plate. However, the protective layer in the other preferred embodiment may be glass plate as well. 
         [0060]    According to the above mentioned preferred embodiments, it is understood that the input device with luminous patterns of the present invention is improved according to the combination manner of the input device with the light shading materials and the utilization efficiency of the backlight, i.e. the substrate or the protective layer of the input interface is formed by uniformly mixing the transparent plastic particles or the transparent glass particles with the plurality of light shading particles first and then processed with the injection molding process, so as to let the input interface has the predetermined light shading rate. Accordingly, the present invention may not only simplify the combination process of the backlight module with the light shading materials, reduce the probability of distributing the light shading materials unevenly during the fabrication process, and avoid the light shading materials fallen off due to a long term use or wear and tear during the light shading materials is transported. Herein, when the input interface or the protective layer uniformly mixed with the light shading materials to have a lower predetermined light shading rate is combined with the design of densely arranging the micro structures of light guide on light guide plate for forming the patterns, not only the utilization efficiency of the backlight is significantly increased, but also the requirement of not to show the patterns when the backlight turned off is achieved. In addition, it is studied and thus found out that the most proper light shading rate of the input device with the luminous patterns fabricated by such a manner is about 75% to 80%. Therefore, it is able to not only achieve the requirement of not to show the patterns when the backlight is turned off, but also enhance the utilization efficiency of the backlight of the input device with the luminous patterns of the present invention to 20% to 25%, which is ten times to the utilization efficiency of the backlight of the conventional input device. In a word, the input device with the luminous patterns of the present invention is improved according to the combination manner of the input device with the light shading materials and the utilization efficiency of the backlight, so as to have the advantages of enhancing utilization efficiency of the backlight, reducing cost, simplifying process, enhancing light shading uniformity and avoiding the light shading materials fallen off due to a long term use or wear and tear during transportation, and thus it is capable of enhancing overall value of industrial applications of the input device with the luminous patterns. 
         [0061]    Although specific embodiments of the present invention have been described, it will be understood by those of skill in the art that there are other embodiments that are equivalent to the described embodiments. Accordingly, it is to be understood that the invention is not to be limited by the specific illustrated embodiments, but only by the scope of the appended claims.