Abstract:
A liquid crystal display is disclosed. The liquid crystal display comprises: a liquid crystal panel; a bottom cover disposed on the back surface of the liquid crystal panel and mounting and supporting the liquid crystal panel; a printed circuit board disposed on the back surface of the bottom cover; and a cover shield fastened to the bottom cover and the printed circuit board so as to cover the printed circuit board and comprising at least two depressed portions at a fastening portion fastened to the bottom cover and the printed circuit board.

Description:
This application claims priority to and the benefit of Korea Patent Application NO. 10-2006-0083400 filed on Aug. 31, 2006, which is hereby incorporated by reference for all purposes as if fully set forth herein. 
     BACKGROUND 
     1. Field 
     This document relates to a liquid crystal display. 
     2. Related Art 
     A liquid crystal display is a display device which can display an image using an electro-optical characteristic of a liquid crystal. 
     A liquid crystal display may comprise a liquid crystal panel, a bottom cover, first and second printed circuit boards, and a cover shield. Moreover, the liquid crystal display may further comprise a backlight unit providing light and an inverter substrate providing power to the backlight unit. 
     The bottom cover is disposed on the back surface of the liquid crystal panel, and can mount and support the liquid crystal panel. 
     The bottom cover comprises a bottom portion and side portions extending from the bottom portion to thus form a storage space, and this storage space can store the backlight unit. 
     A plurality of circuit parts generating a driving voltage and/or control signal for driving the liquid crystal panel may be mounted on the first and second printed circuit boards, respectively. Here, the first printed circuit board may be disposed on the lateral surface of the bottom cover by bending a driving film for electrically connecting to the liquid crystal panel. Moreover, the second printed circuit board may be disposed on the back surface of the bottom cover by bending a flexible printed circuit board for electrically connecting to the first printed circuit board. 
     A cover shield is formed to cover the second printed circuit board, thereby protecting the second printed circuit board. The cover shield may include a body portion and side portions extending from the body portion, and be formed of a metal material. 
     Meanwhile,  FIG. 1  is an exploded perspective view for explaining a back surface fastening structure in a liquid crystal display according to the related art.  FIG. 2  is a perspective view showing the back surface in the liquid crystal display of  FIG. 1 .  FIG. 3  is a cross sectional view for explaining the back surface fastening structure in the liquid crystal display in more detail. 
     Referring to  FIGS. 1 to 3 , the bottom cover  20 , second printed circuit board  40  and cover shield  50  of the liquid crystal display  1  according to the related art may be fastened by the same screws  60 . 
     The bottom cover  20  may have a projecting portion  26  projected in the direction of the second printed circuit board  30  from the bottom portion  22 . At this time, burring holes  28  for fastening the screws  60  may be formed in the projecting portion  26 . 
     As the second printed circuit board  40  is disposed between the bottom cover  20  and the cover shield  50 , through holes  42  through which the screws  60  pass may be formed in the second printed circuit board  40  corresponding to the position of the burring holes  28 . 
     The cover shield  50  comprises a body portion  52  and side portions  54  extending from the body portion  52  so as to cover the second printed circuit board  40 . At this time, though holes  55  through which the screws  60  pass may be formed in the cover shield  50  corresponding to the position of the burring holes  28 . 
     The cover shield  50  may have depressed portions  57  retracted in the direction of the second printed circuit board  40  from the body portion  52 . This is for preventing a head portion  62  of the screws  60  from projecting against the body portion  52  when fastening the screws  60 . 
     Meanwhile, screws  60  having a predetermined size are commoditized for the purposes of preventing the screws  60  from being incorporated in the production line of the liquid crystal display  1  that mass-produces liquid crystal displays  1  of various sizes, and of improving the productivity of the liquid crystal display  1 . 
     Accordingly, the depth of the depressed portions  57  of the cover shield  50  needs to be adjusted, and the formation of the depressed portions  57  can be performed by one press process. 
     However, if the depressed portions  57  are formed by drawing part of the cover shield at a time by using one press process, a crack may be generated in the depressed portions  57 . And, the crack generated in the depressed portions  57  may be further deteriorated with the elapse of time. 
     Due to this, the cover shield  50 , second printed circuit board  40 , and bottom cover  20  are not precisely fastened, thereby reducing the productivity of the liquid crystal display  1 . 
     SUMMARY 
     An aspect of this document is to provide a liquid crystal display, comprising: a liquid crystal panel; a bottom cover disposed on the back surface of the liquid crystal panel and mounting and supporting the liquid crystal panel; a printed circuit board disposed on the back surface of the bottom cover; and a cover shield fastened to the bottom cover and the printed circuit board so as to cover the printed circuit board and comprising at least two depressed portions at a fastening portion fastened to the bottom cover and the printed circuit board. 
     According to the present invention, it is possible to prevent a crack or the like of the cover shield at the fastening portion for fastening screws, as well as to commoditize the screws used to fasten between the bottom cover, printed circuit board and cover shield. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view for explaining a back surface fastening structure in a liquid crystal display according to the related art. 
         FIG. 2  is a perspective view showing the back surface in the liquid crystal display of  FIG. 1 . 
         FIG. 3  is a cross sectional view for explaining the back surface fastening structure in the liquid crystal display in more detail. 
         FIG. 4  is an exploded perspective view for explaining a back surface fastening structure in the liquid crystal display of  FIG. 4 . 
         FIG. 5  is an exploded perspective view for explaining a back surface fastening structure in the liquid crystal display of  FIG. 4 . 
         FIG. 6  is a perspective view showing the back surface in the liquid crystal display of  FIG. 4 . 
         FIG. 7  is a partial exploded perspective view for explaining one example of a back surface fastening structure in the liquid crystal display of  FIG. 4  in more detail. 
         FIG. 8  is a perspective view enlarging “A” of  FIG. 7 . 
         FIG. 9  is a perspective view enlarging “A” of  FIG. 7  and showing the front surface thereof. 
         FIG. 10  is a cross sectional view for explaining the fastening structure of  FIG. 7  in more detail. 
         FIG. 11  is a partial exploded perspective view for explaining one example of a back surface fastening structure in detail in the liquid crystal display of  FIG. 4 . 
         FIG. 12  is a perspective view enlarging “B” of  FIG. 11 . 
         FIG. 13  is a perspective view enlarging “B” of  FIG. 11  and showing the front surface thereof. 
         FIG. 14  is a cross sectional view for explaining the second fastening structure of  FIG. 11  in more detail. 
         FIG. 15  is an exploded perspective view showing a liquid crystal display according to one embodiment of the present invention. 
         FIG. 16  is an exploded perspective view for explaining a back surface fastening structure in the liquid crystal display of  FIG. 15 . 
         FIG. 17  is a perspective view showing the back surface in the liquid crystal display of  FIG. 15 . 
         FIG. 18  is a partial exploded perspective view for explaining one example of a back surface fastening structure in detail in the liquid crystal display of  FIG. 15 . 
         FIG. 19  is a perspective view enlarging “C” of  FIG. 18 . 
         FIG. 20  is a perspective view enlarging “C” of  FIG. 18  and showing the front surface thereof. 
         FIG. 21  is a cross sectional view for explaining the fastening structure of  FIG. 18  in more detail. 
         FIG. 22  is a cross sectional view for explaining one example of the surface in the liquid crystal display of  FIG. 15  in more detail. 
     
    
    
     Advantages and features of the present invention and methods of accomplishing the same may be understood more readily with reference to the following detailed description of preferred embodiments and the accompanying drawings. 
     DETAILED DESCRIPTION 
     Hereinafter, an implementation of this document will be described in detail with reference to the attached drawings. 
       FIG. 4  is an exploded perspective view for explaining a back surface fastening structure in the liquid crystal display of  FIG. 4 .  FIG. 5  is an exploded perspective view for explaining a back surface fastening structure in the liquid crystal display of  FIG. 4 .  FIG. 6  is a perspective view showing the back surface in the liquid crystal display of  FIG. 4 . 
     Referring to  FIGS. 4 to 6 , the liquid crystal display according to one embodiment of the present invention may comprise a liquid crystal panel  110 , a bottom cover  120 , first and second printed circuit boards  130  and  140 , and a cover shield  150 . Further, the liquid crystal display  100  according to one embodiment of the present invention may further comprise a backlight unit  170  providing light and an inverter substrate  180  supplying power to the backlight unit. 
     The liquid crystal panel  110  may be mounted on a panel guide  116  formed in a roughly rectangular frame so as to cover side portions  124  of the bottom cover  120 . At this time, the liquid crystal panel  110  may be fixed onto the panel guide  116  by a top cover  118  which is fastened to the panel guide  116  and the bottom cover  120  through screws and/or hooks. 
     The liquid crystal panel  110  may comprise a color filter substrate  112  and a thin film transistor substrate  114  that are opposed to each other with a liquid crystal interposed between them. 
     The color filter substrate  112  represents colors of an image to be displayed through the liquid crystal panel  110 . The color filter substrate  112  may comprise a color filter array, for example, red/green/blue filter arrays, formed of a thin film on a substrate of a transparent material such as glass or plastic. 
     The thin film transistor substrate  114  may provide a driving voltage provided from the first printed circuit board  130  to liquid crystal in response to a control signal provided from the second printed circuit board  140 . The thin film transistor substrate  114  may comprise a thin film transistor formed as a thin film on a substrate of a transparent material such as glass or plastic, pixel electrodes, and common electrodes. Here, the common electrodes may be formed on the color filter substrate. 
     The bottom cover  120  may be disposed on the back surface of the liquid crystal panel  110 , and mount and support the liquid crystal panel  110 . That is, the bottom cover  120  is disposed on the back surface of the liquid crystal panel  110  to mount and support the liquid crystal panel  110  through the panel guide  116  fastened to the bottom cover  120 . 
     The bottom cover  120  comprises a bottom portion  122  and side portions  124  extending from the bottom portion  122 , thereby forming a storage space. In this storage space, a backlight unit  170  disposed between the bottom cover  120  and the liquid crystal panel  110  may be stored. 
     A plurality of circuit parts for generating a driving voltage and/or control signal for driving the liquid crystal panel  110  may be mounted on the first and second printed circuit boards  130  and  140 , respectively. Each of the first and second printed circuit boards  130  and  140  will be described in more detail. 
     A plurality of circuit parts, for example, a resistor, a capacitor and the like, may be mounted on the first printed circuit board  130 . The plurality of circuit parts mounted on the first printed circuit board  130  may generate a driving voltage required for the driving of the liquid crystal panel  110  by using a control signal provided from the second printed circuit board  140 . At this time, the generated driving voltage may be provided to the thin film transistor substrate  114  through driving films  132  for electrically connecting the first printed circuit board  130  and the thin film transistor substrate  114 . 
     The size of the first printed circuit board  130  increases along with an increase in the size of the liquid crystal display  100 . Due to this, if the first printed circuit board  130  is formed in one unit, it can receive a high tensile force. Thus, the first printed circuit board  130  may be divided into two. The first printed circuit board  130  of this type may be disposed on the lateral surface of the bottom cover  120  by bending the driving films  132 . 
     A plurality of circuit parts, for example, a timing controller or the like, may be mounted on the second printed circuit board  140 . The plurality of circuit parts mounted on the second printed circuit board may generate a control signal for driving the liquid crystal panel  110  by realigning a control signal inputted from outside. At this time, the generated control signal may be provided to the first printed circuit board  130  through a flexible printed circuit board  144  connecting the second printed circuit board  140  and the first printed circuit board  130  divided into two. The second printed circuit board  140  of this type may be disposed on the back surface of the bottom cover  120  by bending the flexible printed circuit board  144 . 
     Meanwhile, rather than forming the first and second printed circuit boards  130  and  140 , respectively, the first and second printed circuit boards  130  and  140  are formed as one unit, and the printed circuit boards formed as one unit may be disposed on the back surface of the bottom cover  120  by vending the driving films  132 . At this time, the flexible printed circuit board  144  may not be required. 
     The cover shield  150  may protect the second printed circuit board  140  by being formed so as to cover the second printed circuit boar  140 . Further, the cover shield  150  may prevent the movement of the second printed circuit boar  140  by fastening the bottom cover  120  and the second printed circuit board  140  by the screws  160 . 
     The cover shield  150  may comprise a body portion  152  and side portions  154  extending from the body portion  152 , and may be formed of a metal material with high rigidity. Here, a plurality of radiation holes  153  may be formed in the body portion  152  of the cover shield  150 , for emitting the heat emitted from the plurality of circuit parts mounted on the second printed circuit board  140 . 
     The backlight unit  170  comprises a light source  171 , a reflective plate  173 , a diffusion plate  174 , and an optical sheet  176 . 
     The light source  171  may generate light by being driven by a boosted AC voltage provided from the inverter substrate  180 . The light source  171  may be fixed by being inserted into light source holders  172  formed at both opposite ends thereof. 
     Such a light source  171  may be any one of a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL) and an external electrode fluorescent lamp (EEFL), but is not limited thereto. 
     The reflective plate  173  may increase light efficiency by reflecting upward the light exiting downward among the light exiting in all directions (upward/downward/leftward/rightward) from the light source  171 . 
     The diffusion plate  174  may be mounted on a support side mold  175  and/or bottom cover  120 . The diffusion plate  174  prevents the shape of the light source  171  from being shown on the liquid crystal panel  110 , and may diffuse the light emitted from the light source  171 . 
     The optical sheet  176  may be mounted on the diffusion plate  174 . The optical sheet  176  may improve the brightness characteristic of the light exiting from the light source  171 . 
     The optical sheet  176  may comprise at least one of a diffusion sheet, a prism sheet, and a brightness enhancement sheet. 
     The inverter substrate  180  may be disposed on the back surface of the bottom cover  120 . A plurality of circuit parts for driving the light source  171  may be mounted on the inverter substrate  180 , which is a kind of printed circuit board. The plurality of circuit parts mounted on the inverter substrate  180  may boost a low AC voltage provided from outside to a high AC voltage for driving the light source  171 . At this time, the boosted high AC voltage may be provided to light source electrodes formed at both opposite ends of the light source  171  through a light source electrode line  181 . 
     Such an inverter substrate  180  may be fastened to the bottom cover through screws. Further, the inverter substrate  180  may be protected through a cover shield made of plastic material provided separately. 
       FIG. 7  is a partial exploded perspective view for explaining one example of a back surface fastening structure in the liquid crystal display of  FIG. 4  in more detail.  FIG. 8  is a perspective view enlarging “A” of FIG.  7 .  FIG. 9  is a perspective view enlarging “A” of  FIG. 7  and showing the front surface thereof. 
     Referring to  FIGS. 7 to 10 , a bottom cover  120 , a second printed circuit board  140  and a cover shield  150  of the liquid crystal display  100  according to one embodiment of the present invention may be fastened by same screws  160 . 
     The bottom cover  120  may have a projecting portion  126  projected in the direction of the second printed circuit board  140  from the bottom portion  122 . At this time, burring holes  28  for fastening the screw  60  may be formed in the projecting portion  26 . 
     As the second printed circuit board  140  is disposed between the bottom cover  120  and the cover shield  150 , through holes  142  through which the screws  160  pass may be formed in the second printed circuit board  140  corresponding to the position of the burring holes  128 . 
     The cover shield  150  comprises a body portion  152  and side portions  154  extending from the body portion  152  so as to cover the second printed circuit board  140 . At this time, though holes  155  through which the screws  60  pass may be formed in the cover shield  150  corresponding to the position of the burring holes  128 . 
     In the cover shield  150 , at least two depressed portions may be formed at a fastening portion  156  fastened to the bottom cover  120  and the printed circuit board  140  in order to commoditize the screws  160  and prevent a crack. 
     For example, a first depressed portion  157  may be formed which is retracted in the direction of the printed circuit board  140  from the body portion  152 . Further, a second depressed portion  158  may be formed which extends from the first depressed portion  157  and is retracted in the direction of the second printed circuit board  140  from the first depressed portion  157 . 
     The first depressed portion  157  may be contacted with head portions  162  of the screws  160 , and the second depressed portion  158  may be contacted with the printed circuit board  140 . Here, the head portions  162  of the screws  160  may not be projected outward from the body portion  152  by the first depressed portion  157 . 
     The first and second depressed portions  157  and  158  may be formed by first and second press processes of the cover shield  150  formed of metal material, respectively. 
     Once the first and second depressed portions  157  and  158  are formed respectively by gradually drawing part of the cover shield in a stepwise fashion by the first and second press processes, respectively, it is possible to prevent a crack from being generated in the first and second depressed portions  157  and  158 . 
     The second depressed portion  158  formed by the second press process may be divided into at least two. This is for preventing a crack from being generated in the second depressed portion  158  by preventing the second depressed portion  158  from being drawn much at the time of formation of the second depressed portion  158  by the second press process. 
     Concretely, part of the cover shield is drawn at a predetermined ratio by a first press process to form a first depressed portion  157 . At this time, as the cover shield portion where the first depressed portion  157  is formed has been drawn at a predetermined ratio, if a second depressed portion  158  is formed in an integral closed curve by a second press process, the second depressed portion  158  is drawn once again, which may generate a crack in the second depressed portion  158 . 
     Due to this, the second depressed portion  158  may be formed in at least two divided from each other by locally drawing the second depressed portion  158 , rather than forming the second depressed portion  158  in an integral shape by the second press process. 
     In the cover shield  150 , the first depth from the body portion  152  to the first depressed portion  157  may be greater than the second depth from the first depressed portion  157  to the second depressed portion  158 . This is for precisely fastening the screws  160  by adjusting the second depth after the height of the screws  160  by the first depth. Here, the screws  160  may be commoditized by properly adjusting the second depth depending on the size of the liquid crystal display  100 . 
       FIG. 11  is a partial exploded perspective view for explaining one example of a back surface fastening structure in detail in the liquid crystal display of  FIG. 4 .  FIG. 12  is a perspective view enlarging “B” of  FIG. 11 .  FIG. 13  is a perspective view enlarging “B” of  FIG. 11  and showing the front surface thereof.  FIG. 14  is a cross sectional view for explaining the second fastening structure of  FIG. 11  in more detail. The fastening structure as shown in  FIGS. 11 to 14  is identical to the fastening structure as shown in  FIGS. 7 to 10  except for the formation direction of the second depressed portion of the cover shield, so only the features thereof will be described. 
     Referring to  FIGS. 11 to 14 , in a back surface fastening structure of the liquid crystal display according to one embodiment of the present invention, a bottom cover  220 , a second printed circuit board  240 , and a cover shield  250  may be fastened by same screws  260 . 
     In the cover shield  250 , at least two depressed portions may be formed at a fastening portion  256  fastened to the bottom cover  220  and the printed circuit board  240  in order to commoditize the screws and prevent a crack. 
     For example, in the cover shield  250 , a first depressed portion  257  may be formed which is retracted in the direction of the second printed circuit board  240  from the body portion  252  of the cover shield  250 . Further, a second depressed portion  258  may be formed which extends from the first depressed portion  257  and is retracted in the direction of the body portion  252  from the first depressed portion  257 . At this time, the first depth from the body portion  252  to the first depressed portion  257  in the cover shield  250  may be greater than the second depth between the first and second depressed portions  257  and  258 . 
     Due to this, the first depressed portion  257  may be contacted with the second printed circuit board  240 , and the second depressed portion  258  may be contacted with head portions  262  of the screws  260 . Here, the head portions  262  of the screws  260  may not be projected against the body portion  252  by the first depressed portion  257 . 
     The first and second depressed portions  257  and  258  may be formed by first and second press processes, respectively, of the cover shield  250  formed of a metal material. 
     Meanwhile,  FIG. 15  is an exploded perspective view showing a liquid crystal display according to one embodiment of the present invention.  FIG. 16  is an exploded perspective view for explaining a back surface fastening structure in the liquid crystal display of  FIG. 15 .  FIG. 17  is a perspective view showing the back surface in the liquid crystal display of  FIG. 15 . The liquid crystal display as shown in  FIG. 15  is similar to the liquid crystal display as shown in  FIG. 4 , so only the features thereof will be described. 
     Referring to  FIGS. 15 to 17 , the liquid crystal display  300  according to one embodiment of the present invention may comprise a liquid crystal panel  310 , a backlight unit  370 , a bottom cover  320 , an inverter substrate  380 , and a first cover shield  390 . Further, the liquid crystal display  300  according to one embodiment of the present invention may further comprise first and second printed circuit boards  330  and  340  and a second cover shield  350 . 
     The inverter substrate  380  may be disposed on the back surface of the bottom cover  320 . A plurality of circuit parts for driving a light source  271  may be mounted on the inverter substrate  380 , which is a kind of printed circuit board. 
     The first cover shield  390  may protect the inverter substrate  380  by being formed so as to cover the inverter substrate  380 . Further, the first cover shield  390  may prevent the movement of the inverter substrate  380  by fastening the bottom cover  320  and the inverter substrate  380  by screws  400 . 
     The first cover shield  390  may comprise a body portion  392  and side portions  394  extending from the body portion  392 , and may be formed of a metal material with high rigidity. Here, a plurality of radiation holes  393  may be formed in the body portion  392  of the first cover shield  390 , for emitting the heat emitted from the plurality of circuit parts mounted on the inverter substrate  380 . 
     A plurality of circuit parts for generating a driving voltage and/or control signal for driving the liquid crystal panel  310  may be mounted on the first and second printed circuit boards  330  and  340 , respectively. 
     The second cover shield  350  may protect the second printed circuit board  340  by being formed so as to cover the second printed circuit boar  340 . Further, the second cover shield  350  may prevent the movement of the second printed circuit boar  340  by fastening the bottom cover  320  and the second printed circuit board  340  by screws  360 . 
     In the liquid crystal display according to one embodiment of the present invention, unexplained reference numerals  312  and  314  represent a color filter substrate and a thin film transistor substrate, respectively. Further, unexplained reference numerals  316  and  318  represent a panel guide and a top cover, respectively. Further, unexplained reference numerals  322  and  324  represent a bottom portion and side portions of the bottom cover, respectively. Further, unexplained reference numerals  332  and  344  represent a driving film and a flexible printed circuit board, respectively. Further, unexplained reference numerals  352 ,  353 , and  354  represent a body portion, radiation holes and side portions of the second cover shield, respectively. Further, unexplained reference numerals  372 ,  373 ,  374 ,  375 , and  376  represent a light source holder, a reflective plate, a diffusion plate, a support side mold, and an optical sheet, respectively. Further, unexplained reference numeral  393  represents radiation holes of the first cover shield. 
       FIG. 18  is a partial exploded perspective view for explaining one example of a back surface fastening structure in detail in the liquid crystal display of  FIG. 15 .  FIG. 19  is a perspective view enlarging “C” of  FIG. 18 .  FIG. 20  is a perspective view enlarging “C” of  FIG. 18  and showing the front surface thereof.  FIG. 21  is a cross sectional view for explaining the fastening structure of  FIG. 18  in more detail. 
     Referring to  FIGS. 18 to 21 , in a back surface fastening structure of the liquid crystal display  300  according to one embodiment of the present invention, a bottom cover  320 , an inverter substrate  380 , and a first cover shield  390  may be fastened by same screws  400 . 
     The bottom cover  320  may have a projecting portion  327  projected in the direction of the inverter substrate  380  from the bottom portion  322 . At this time, burring holes  382  for fastening the screw  400  may be formed in the projecting portion  327 . 
     As the inverter substrate  380  is disposed between the bottom cover  320  and the first cover shield  390 , through holes  382  through which the screws  400  pass may be formed in the inverter substrate  380  corresponding to the position of the burring holes  329 . 
     The first cover shield  390  comprises a body portion  392  and side portions  394  extending from the body portion  392  so as to cover the inverter substrate  380 . At this time, though holes  395  through which the screws  400  pass may be formed in the first cover shield  390  corresponding to the position of the burring holes  329 . 
     In the first cover shield  390 , at least two depressed portions may be formed at a first fastening portion  396  fastened to the bottom cover  320  and the inverter substrate  380  in order to commoditize the screws  400  and prevent a crack. 
     For example, in the first cover shield  390 , a first depressed portion  397  may be formed which is retracted in the direction of the inverter substrate  380  from the body portion  392  of the first cover shield  390 . Further, a second depressed portion  398  may be formed which extends from the first depressed portion  397  and is retracted in the direction of the inverter substrate  380  from the first depressed portion  397 . At this time, the first depth from the body portion  392  to the first depressed portion  397  in the first cover shield  390  may be greater than the second depth between the first and second depressed portions  397  and  398 . Here, the screws  400  may be commoditized by properly adjusting the second depth between the first and second depressed portions  397  and  398  depending on the size of the liquid crystal display  300 . 
     Due to this, the first depressed portion  397  may be contacted with head portions  402  of the screws  400 , and the second depressed portion  398  may be contacted with the inverter substrate  380 . Here, the head portions  402  of the screws  400  may not be projected outward from the body portion  392  by the first depressed portion  397 . 
     The first and second depressed portions  397  and  398  may be formed by first and second press processes of the first cover shield  390  formed of metal material, respectively. 
     The second depressed portion  398  formed by the second press process may be divided into at least two. 
       FIG. 22  is a cross sectional view for explaining one example of the surface in the liquid crystal display of  FIG. 15  in more detail. The fastening structure as shown in  FIG. 22  is identical to the fastening structure as shown in  FIGS. 18 to 21  except for the formation direction of the second depressed portion of the first cover shield, so only the features thereof will be described. 
     Referring to  FIG. 22 , in a back surface fastening structure of the liquid crystal display according to one embodiment of the present invention, a bottom cover  420 , a bottom cover  420 , an inverter substrate  480 , and a first cover shield  490  may be fastened by same screws  500 . 
     In the first cover shield  490 , at least two depressed portions may be formed at a first fastening portion  496  fastened to the bottom cover  420  and the inverter substrate  480  in order to commoditize the screws  500  and prevent a crack. 
     For example, in the first cover shield  490 , a first depressed portion  497  may be formed which is retracted in the direction of the inverter substrate  480  from the body portion  492  of the first cover shield. Further, a second depressed portion  498  may be formed which extends from the first depressed portion  497  and is retracted in the direction of the body portion  492  from the first depressed portion  497 . At this time, the first depth from the body portion  492  to the first depressed portion  497  in the first cover shield  490  may be greater than the second depth between the first and second depressed portions  497  and  498 . 
     Due to this, the first depressed portion  497  may be contacted with the inverter substrate  480 , and the second depressed portion  498  may be contacted with head portions  502  of the screws  500 . Here, the head portions  502  of the screws  500  may not be projected outward from the body portion  492  by the first depressed portion  497 . 
     The first and second depressed portions  497  and  498  may be formed by first and second press processes of the first cover shield  490  formed of metal material, respectively. 
     The second depressed portion  498  formed by the second press process may be divided into at least two. 
     Although the embodiment of the present invention has been described with reference to accompanying drawings, those skilled in the art can appreciate that the present invention may be implemented in some other concrete forms without departing from the technical sprit of the present invention or modifying the essential features of the present invention. 
     Accordingly, since the above-described embodiment is provided to fully notify those skilled in the art of the scope of the present invention, it must be appreciated that the embodiment is illustrative in all aspects, but not restrictive. The present invention is defined only by the appended claims.