Abstract:
A liquid crystal display (LCD) includes a backlight module, a cell module installed in front of the backlight module, and a front frame which includes a frame body with holes and buffer material. The buffer material has a first part disposed in the holes and fixed to the cell module and backlight module through the front frame, and a second part sandwiched between the frame body and cell module. A method for manufacturing a LCD device is also provided, including forming a buffer material on a frame body by injection molding, firmly connecting the frame body, a cell module, and a backlight module, and locating the buffer material between the frame body and cell module.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to an LCD, and more particularly, to a backlight module, a front frame and a back bezel thereof, and a method for manufacturing the LCD. 
     2. Description of the Related Art 
     Referring to  FIG. 1   a , a conventional liquid crystal display (LCD) mainly includes a front frame  110 , a liquid crystal array cell module  120  and a backlight module  130 . The front frame  110  is used for firmly combining the liquid crystal array cell module  120  and the backlight module  130 . A soft adhesive material, attached to a front surface of the frame body  112  of the front frame  110 , serves as buffer material  111  between the frame body  112  and the liquid crystal array cell module  120  as shown in  FIGS. 1   b  and  1   c .  FIGS. 1   b  and  1   c  are the top view and bottom view of the front frame  110 , respectively. Generally, the buffer material  111  is a double-sided adhesive tape. Sticking the adhesive tape on the front frame body  112  requires a lot of time and attention to avoid position shift, which negatively affects the optical performance of LCD display and raises a reliability issue during later usage. 
     Referring to  FIG. 2   a , the LCD backlight module includes a frame  131 , a light guide plate  132 , light sources  133 , a reflector sheet  134  and a back bezel  135 . By integrating the frame  131  and back bezel  135  tightly, the light guide plate  132 , light source  133  and reflector sheet  134  are combined firmly. Generally, a protective film  1352  is attached to the back bezel body  1351  of the back bezel  135  as shown in  FIG. 2   b , to avoid crumbing caused by the friction between the back bezel body  1351  and some other parts during the assembly process. Crumbing negatively affects display quality. Currently, protective film attachment is done by operators manually, thus, requiring a lot of manpower and manufacturing costs as the attachment area is pretty large. 
     BRIEF SUMMARY OF THE INVENTION 
     A detailed description is given in the following embodiments with reference to the accompanying drawings. 
     The present invention provides a backlight module and a method for manufacturing an LCD device. According to one embodiment, a liquid crystal display device includes a backlight module, a liquid crystal array cell module disposed in front of the backlight module and a front frame. The front frame includes a front frame body and a buffer material, the front frame body has a plurality of holes, the buffer material includes a first portion and a second portion, the first portion is disposed in the holes, the front frame firmly connects the liquid crystal array cell module and the backlight module, and the second portion is connected to first portion and disposed between the front frame body and the liquid crystal array cell module. The front frame body includes a plurality of side frames and corners where the side edges connect. The first portion is disposed on the side edges or corners of the front frame body. 
     An embodiment of the method for fabricating a liquid crystal display device comprising forming a buffer material on a front frame by injection molding and firmly connecting a liquid crystal array cell module and a backlight module by the front frame, with the buffer material sandwiched between the front frame and the liquid crystal array cell module. 
     In another embodiment of the invention, a backlight module comprises a light source, a light guide plate disposed in front of the light source and a back bezel including a back bezel body and buffer material, wherein the back bezel body has a plurality of hole, the buffer material comprises a first portion and a second portion, the first portion is disposed in the holes, the back bezel firmly connects the light source and the light guide plate, and the second portion is connected to the first portion and disposed between the back bezel body and the light source. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: 
         FIG. 1   a  is a schematic view showing the LCD structure in the prior art. 
         FIG. 1   b  is a top view showing the front frame structure in the prior art. 
         FIG. 1   c  is a bottom view showing the front frame structure in the prior art. 
         FIG. 2   a  is a schematic view showing the backlight structure in the prior art. 
         FIG. 2   b  is top view showing the back bezel structure in the prior art. 
         FIG. 3  is a schematic view showing the structure for an LCD module according to an embodiment of the invention. 
         FIG. 4   a  is a bottom view showing the front frame structure according to an embodiment of the invention. 
         FIG. 4   b  is a bottom view showing the front frame structure according to another embodiment of the invention. 
         FIGS. 5   a - 5   i  depict a cross sectional views of a front frame structure of various embodiments of the invention. 
         FIGS. 6   a - 6   d  show the front frame structure of various embodiments. 
         FIG. 7   a  is a schematic view showing the backlight structure according to an embodiment of the invention. 
         FIG. 7   b  is a schematic view showing the backlight structure according to another embodiment of the invention. 
         FIG. 8   a  is a schematic view showing the back bezel structure according to the first embodiment of the invention. 
         FIG. 8   b  is a partially enlarged sectional view of the region a in  FIG. 8   a . 
         FIG. 9   a  is a schematic view showing the back bezel structure according to the second embodiment of the invention. 
         FIG. 9   b  is a partially enlarged sectional view of the region b in  FIG. 9   a . 
         FIG. 10  is a schematic view showing the back bezel structure according to the third embodiment of the invention. 
         FIG. 11  is a schematic view showing the back bezel structure according to the fourth embodiment of the invention. 
         FIG. 12   a  is a schematic view showing the back bezel structure according to the first embodiment of the invention. 
         FIG. 12   b  is a partially enlarged sectional view of the region c in  FIG. 12   a . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims. 
       FIG. 3  is a schematic view of a liquid crystal display according to an embodiment of the present invention, wherein the liquid crystal display includes a front frame  310 , a liquid crystal panel module  320  and a backlight module  330 . The front frame  310  has a upper surface  310 F, a lower surface  310 B and at least one hole  310 H. The lower surface  310 B of the front frame  310  contacts the crystal panel module  320 , thus, the front frame  310  combines the liquid crystal panel module  320  and the backlight module  330 . 
       FIG. 4   a  is the bottom view showing the front frame  310  according to an embodiment of the invention, wherein the front frame  310  includes a front frame body  311  and buffer materials  312 . The front frame body  311  has a plurality of side frames  313  and corners  314  where the side frames  313  connect. The buffer materials  312  are formed on the lower surface  310 B of at least one side frame  313  of the frame body  311  by injection molding. 
       FIG. 4   b  is the bottom view showing the front frame  310  according to another embodiment of the invention, wherein the front frame body  311  has a plurality of corners  314  and side frames  313  connecting by the corners  314 , and buffer materials  312 ′ are formed on at least one side edge  313  and a corner  314  of the front frame body  311  by injection molding. The buffer materials  312  and  312 ′ may be soft plastic.  FIGS. 5   a  to  5   i  are the cross-sectional views of the front frame of  FIGS. 4   a  and  4   b  taken along V-V line, respectively showing various embodiments of the invention. 
       FIG. 5   a  depicts a cross sectional view of the front frame body  310  provided with no holes. Buffer material  312   a  is formed on the lower surface  310 B of the front frame body  311   a  by injection molding without contacting the side edge  313   a  and upper surface  310 F. 
       FIG. 5   b  depicts a cross sectional view of a modified front frame  310  provided with a blind hole  310 H. Buffer material  312   b  is attached to the lower surface  310 B of the front frame body  311   b  by injection molding and contacts the side edge  313   b . The blind hole  310 H is provided to increase the contact area between the buffer material  312   b  and the front frame body  311   b  for enhancing the attachment. Note that the blind hole  310 H does not extend to the upper surface  310 F. 
       FIG. 5   c  depicts a cross sectional view of another modified front frame  310  having a through hole  310 H. Buffer material  312   c  is attached to the lower surface  310 B of the front frame body  311   c  by injection molding. It is optional that the buffer material  312   c  may or may not contact the side edge  313   c . The through hole  310 H is provided to increase the contact area between the buffer material  312   c  and the front frame body  311   c  for enhancing the attachment. Note that the buffer material  312   c  does not extend to the upper surface  310 F. 
       FIG. 5   d  depicts a cross sectional view of yet another modified front frame  310  having a through hole  310 H. Buffer material  312   d  is attached to the lower surface  310 B of the front frame body  311   d  by injection molding. It is optional that the buffer material  312   d  may or may not contact the side edge  313   d . The front frame body  311   d  has at least one through hole  310 H which is beveled at a lead angle  310 L on the upper surface  310 F for further increasing the contact area between the buffer material  312   d  and the front frame body  311 d and enhancing the attachment. Note that the buffer material  312   d  does not extend to the upper surface  310 F. Specifically, the buffer material  312   d  includes a first portion  312   d ′ and a second portion  312   d ″. The first portion  312   d ′ is disposed in the through hole  310 H. The second portion  312   d ″ is connected to the first portion  312   d ′ and disposed between the front frame body  311  and the liquid crystal panel module  320  when the liquid crystal display is assembled. 
       FIG. 5   e  depicts a cross sectional view of another modified front frame  310  having a through hole  310 H. Buffer material  312   e  is attached to the lower surface  310 B of the front frame body  311   e  by injection molding. It is optional that the buffer material  312   e  may or may not contact the side edge  313   e . The through hole  310 H is beveled at a lead angle  310 L on both the lower surface  310 B and the upper surface  310 F for increasing the contact area between the buffer material  312   e  and the front frame body  311   e  and enhancing the attachment. Note that the buffer material  312   e  does not extend to the upper surface  310 F. 
       FIG. 5   f  depicts a cross sectional view of yet another modified front frame having no hole. Buffer material  312   f  is attached to the lower surface  310 B of the front frame body  311   f  by injection molding. It is optional that the buffer material  312   f  may or may not contact the side edge  313   f . The lower surface  310 B is roughened to increase the contact area between the buffer material  312   f  and the front frame body  311   f  and enhance the attachment. 
       FIG. 5   g  depicts a cross sectional view of another modified front frame  310  having a through hole  310 H. Buffer material  312   g  provided by injection molding extends from the lower surface  310 B through the through hole  310 H to the upper surface  310 F for increasing the contact area and enhancing the attachment of the buffer material  312   g  to the front frame body  311   g . It is optional that the buffer material  312   g  may or may not contact the side edge  313   g . Specifically, the buffer material  312   g  includes a first portion  312   g ′, a second portion  312   g ″ and a third portion  312   g ′″. The first portion  312   g ′ is disposed in the through hole  310 H. The second portion  312   g ″ is connected to the first portion  312   g ′. The third portion  312   g ′″ is disposed on the upper surface  310 F and connected to the second portion  312   g ′″ through the first portion  312   g ′. 
       FIG. 5   h  depicts a cross sectional view of yet another modified front frame  310  provided with no holes. Buffer material  312   h  provided by injection molding is attached to the lower surface  310 B of the front frame body  311   h  and extends to that of the side edge  313   h , thereby, it is shaped as L-shaped in cross sectional view. That is, the buffer material  312   h  includes a first portion that is disposed on the side edges  313 h and the corners of the front frame body  311   h . 
       FIG. 5   i  depicts a cross sectional view of another modified front frame  310  having holes  310 H. Buffer material  312   i  provided by injection molding is attached to the lower surface  310 B of the front frame body  311   i  and extends to that of the side edge  313   i . The front frame body  311   i  and the side edge  313   i  are respectively provided with at least one through hole  310 H to increase the contact area between the buffer material  312   i  and the front frame body  311   i  as well as enhance the attachment. 
       FIGS. 6   a  to  6   c  show some other embodiments of the front frame  310  of the invention. Referring to  FIG. 6   a , buffer material  312   j  is attached in a manner of section by section to the lower surface  310 B of the front frame body  311   j  by injection molding. 
       FIG. 6   b  depicts another embodiment of the front frame  310 . The front frame  310  includes two L-shaped front frame bodies  311   k  and  311   k ′. Buffer material  312   k  is attached to the lower surface  310 B of the front frame bodies  311   k  and  311   k ′ by injection molding, and then the front frame bodies  311   k  and  311   k ′ are combined by soldering, screws or adhesives. 
       FIG. 6   c  depicts yet another embodiment of the front frame  310 . The front frame  310  includes two U-shaped front frame bodies  311   l . Buffer material  312   l  is attached to the lower surface  310 B of the front frame body  311   l  by injection molding, and then the two U-shaped frame bodies  311   l  are combined by soldering, screws or adhesives. 
       FIG. 6   d  depicts another embodiment of the front frame  310 . Buffer material  312   m  is attached to the front frame body  311   m  by injection molding. The buffer material  312   m  has several portions and every portion is located in the hole  310 H and on both the upper surface  310 F and lower surface  310 B of the front frame body  311   m.    
       FIGS. 7   a  and  7   b  depict different embodiments of the backlight module of the invention.  FIG. 7   a  depicts the edge type backlight module  330 , wherein a frame body  331  is used to combine a light guide plate  332 , light sources  333   a , a reflection sheet  334 , and a back bezel  335   a . The light guide plate  332  is disposed in front of the light source  333   a . The back bezel  335 a has a back bezel body  3351   a  and a buffer material  3352   a  located on the back bezel body  3351   a . The back bezel body  3351   a  includes a bottom plate  33511 , a plurality of side edges  33512 , and a plurality of corners  33513  wherein at least two side edges connect on one corner  33513 . 
       FIG. 7   b  depicts the direct type backlight module  330 , wherein a frame body  331  is used to combine a light guide plate  332 , light sources  333   b , a reflection sheet  334 , and a back bezel  335   b . The back bezel  335   b  has a back bezel body  3351   b  and a buffer material  3352   b  located on the back bezel body  3351   b . The back bezel body  3351   b  includes a bottom plate  33511 , a plurality of side edges  33512 , and a plurality of corners  33513  wherein at least two side edges  33512  connect on one corner  33513 . 
       FIG. 8   a  depicts the first embodiment of the back bezel  335   c  of the backlight module  330  of the invention.  FIG. 8   b  is a partially enlarged sectional view of the region a in  FIG. 8   a . The back bezel  335   c  includes a back bezel body  3351   c  and a buffer material  3352   c . Buffer material  3352   c  is attached to the inner side  33511  rather than the outer side  33510  of the back bezel body  3351   c  by injection molding. The back bezel body  3351   c  includes a bottom plate  33511 , a plurality of side edges  33512 , and a plurality of corners  33513  wherein at least two side edges  33512  may or may not connect on one corner  33513 . The buffer material  3352   c  may be provided in strips. The back bezel body  3351   c  has at least one hole  3353   c , a through hole, to increase the contact area between the buffer material  3352   c  and the back bezel body  3351   c  as well as enhance the attachment. Specifically, the buffer material  3352   c  includes a first portion  3352   c ′ and a second portion  3352   c ″. The first portion  3352   c ′ is disposed in the hole  3353   c . The second portion  3352   c ″ is connected to the first portion  3352   c ′ and disposed between the back bezel body  3351   c  and the light source  333   a , as shown in  FIG. 7   a . 
       FIG. 9   a  depicts the second embodiment of the back bezel  335   d  of the backlight module  330  of the invention.  FIG. 9   b  is a partially enlarged sectional view of the region b in  FIG. 9   a . The back bezel  335   d  includes a back bezel body  3351   d  and a buffer material  3352   d . The back bezel body  3351   d  includes a bottom plate  33511 , a plurality of side edges  33512 , and a plurality of corners  33513  wherein at least two side edges  33512  may or may not connect on one corner  33513 . Buffer material  3352   d  is attached to the inner sides  33511  of the bottom plate  33511  and side edges  33512  of the back bezel body  3351 d by injection molding. Both the bottom plate  33511  and the side edges  33512  have at least one hole  3353   d , a through hole with a bevel  33515 , to increase the contact area between the buffer material  3352   d  and the back bezel body  3351   d  as well as enhance the attachment. Specifically, the buffer material  3352   d  includes a first portion  3352   d ′ and a second portion  3352   d ″. The first portion  3352   d ′ is disposed in the hole  3353   d . The second portion  3352   d ″ is connected to the first portion  3352   d ′ and disposed between the back bezel body  3351   d  and the light source  333   a , as shown in  FIG. 7   a . 
       FIG. 10  depicts the third embodiment of the back bezel  335   e  of the backlight module of the invention. The back bezel body  3351   e  includes a bottom plate  33511 , a plurality of side edges  33512 , and a plurality of corners  33513  wherein at least two side edges  33512  connect on one corner  33513 . Buffer material  3352   e  is attached to the inner sides  3351 I of the bottom plate  33511  and corners  33513  of the back bezel body  3351   e  by injection molding. The back bezel body  3351   e  has at least one hole  3353   e  to increase the contact area between the buffer material  3352   e  and the back bezel body  3351   e  as well as enhance the attachment. 
       FIG. 11  depicts the fourth embodiment of the back bezel  335   f  of the backlight module of the invention. The back bezel body  3351   f  includes a bottom plate  33511 , a plurality of side edges  33512 , and a plurality of corners  33513  wherein at least two side edges  33512  connect on one corner  33513 . Buffer material  3352   f  is attached to the inner sides  3351 I of the side edges  33512 , bottom plate  33511  and corners  33513  of the back bezel body  3351   f  by injection molding. The back bezel body  3351   f  has a plurality of holes  3353   f  to increase the contact area between the buffer material  3352   f  and the back bezel body  3351   f  as well as enhance the attachment. 
       FIG. 12   a  depicts the fifth embodiment of the back bezel  335   g  of the backlight module  330  of the invention.  FIG. 12   b  is a partially enlarged sectional view of the region c in  FIG. 12   a . The back bezel  335   g  includes a back bezel body  3351   g  and a buffer material  3352   g . The back bezel body  3351   g  includes a bottom plate  33511 , a plurality of side edges  33512 , and a plurality of corners  33513  wherein at least two side edges  33512  connect on one corner  33513 . Buffer material  3352   g  is attached to the inner sides  33511  of the side edges  33512  and bottom plate  33511  of the back bezel body  3351   g  by injection molding. The back bezel body  3351   g  has a plurality of holes  3353   g , through holes with at least one bevel  33515 , to increase the contact area between the buffer material  3352   g  and the back bezel body  3351   g  as well as enhance the attachment, wherein the buffer material  3352   g  is located in the holes  3353   g  and on both inner sides  33511  and outer sides  33510  of the back bezel body  3351   g . Specifically, the buffer material  3352 g includes a first portion  3352   g ′, a second portion  3352   g ″, and a third portion  3352   g ″. The first portion  3352   g ′ is disposed in the hole  3353   g . The second portion  3352   g ″ is disposed on the inner side  33511  and connected to the first portion  3352   g ′. The third portion  3352   g ′″ is disposed on the outer side  33510  and connected to the second portion  3352   g ″ through the first portion  3352   g ′. 
     While the invention has been described by way of example and in terms of preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.