Patent Publication Number: US-2009225254-A1

Title: Display module, display-module fixing structure and liquid crystal display apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims the benefit of priority from the prior Japanese Patent Application Nos. 2008-059438 filed on Mar. 10, 2008 and 2008-300621 filed on Nov. 26, 2008, the entire contents of which is incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     The present invention relates to a display module, a fixing structure for the display module and a display apparatus, for a thin display panel held by a frame having a narrow edge that surrounds the display panel. 
     In recent years, display apparatuses or television apparatuses to display images through a liquid crystal display module have rapidly become popular. 
     Such display apparatuses usually consist of: a display panel having a frame for holding a display module, a display screen thereof being installed in the frame for viewing; and a mount to support the display panel so that the display panel can be turned in the perpendicular and lateral directions. 
     Liquid crystal display modules require a backlight device with light sources, such as, cold cathode fluorescent lamps (CCFL) and external electrode fluorescent lamps (EEFL). 
     In such image display apparatuses, a display module is held by a frame with screws turned into bosses formed on the frame (such as disclosed in Japanese Un-examined Patent Publication No. 2000-305068) or with fixing members attached to the module and engaged with ribs formed on the frame (such as disclosed in Japanese Un-examined Patent Publication No. 2003-140117). The publications are referred to as Citations 1 and 2, respectively, hereinafter. 
     With higher popularity of image display apparatuses, there are higher demands for a thinner display panel and a frame for holding the screen of the display panel with a narrower frame edge that surrounds the screen, particularly on the upper edge section and the side edge sections, except for the bottom edge section closer to the mount for supporting the display panel. 
     The assembly of a display panel in which a display module is held by a frame with screws, such as disclosed in Citation 1, however, requires the space for bosses on the outer edge of the frame, thus restricting, at least, on the width of the edge that surrounds the screen, in achieving a narrower frame edge. 
     The assembly of a display panel in which a display module is held on a frame with fixing members of the module engaged with ribs of the frame, such as disclosed in Citation 2, is relatively effective in achieving a narrower frame edge. Such fixing members are, however, provided on the display module as protruding in the thickness direction, and hence not appropriate for achieving a thinner display panel. Particularly, a liquid crystal display panel requires power supply circuits, such as inverters, for supplying power to light sources, provided on the side edges of a display module on both sides of a screen, and hence posing a big problem in achieving a thinner display panel. 
     Such problems discussed above are explained more in detail with respect to  FIG. 16 . 
       FIG. 16  shows a schematic perspective rear view of a known liquid crystal display module  101 , showing the rear side of the module viewed from above. 
     Installed in the liquid crystal display module  101  are several cold cathode fluorescent lamps (CCFL)  102 , as backlights, arranged in parallel in the longitudinal direction H, on the front side of a base  104  of the module  101 , in order to illuminating a screen (not shown) on the front side. 
     Also installed in the liquid crystal display module  101  are inverter circuits  103  provided on both rear edge sides of the base  104 , that supply voltages to electrodes  102   a  of each CCFL  102  through CCFL wirings (not shown). Usually, the CCFL wirings are made as short as possible for stably driving the CCFL  102 . 
     The inverter circuits  103  provided on both sides of the liquid crystal display module  101  pose difficulty in achieving a thinner display panel difficult. 
     SUMMARY OF THE INVENTION 
     A purpose of the present invention is to provide a display module, a fixing structure for the display module and a display apparatus, achieving a thinner display panel held by a frame having a narrower edge that surrounds the display panel, with circuit boards on both sides of the display module. 
     The present invention provides a display module comprising: a base plate having a front surface section and a rear surface section that has at least one edge section; a display panel provided on the front surface section of the base plate; a circuit board provided in a specific zone of the rear surface section of the base plate in which the specific zone is closer to the edge section of the rear surface section of the base plate than a center of the rear surface section is; and a protecting cover to protect the circuit board and the base plate wherein the protecting cover has a higher section and a lower section that is closer to the base plate than the higher section is so that the higher section at least partially covers the circuit board while the lower section at least partially covers the base plate, the higher and lower sections giving a space inside the display module but outside the protecting cover, the space having a height corresponding to a step crated by the higher and lower sections and being located between the specific zone and the edge section of the rear surface section of the base plate. 
     Moreover, the present invention provides a fixing structure for fixing a display module, comprising: a cover; and a fixing component to fix the display module to the cover, wherein the display module includes: a base plate having a front surface section and a rear surface section that has at least one edge section; a display panel provided on the front surface section of the base plate; a circuit board provided in a specific zone of the rear surface section of the base plate in which the specific zone is closer to the edge section of the rear surface section of the base plate than a center of the rear surface section is; and a protecting cover to protect the circuit board and the base plate wherein the protecting cover has a higher section and a lower section that is closer to the base plate than the higher section is so that the higher section at least partially covers the circuit board while the lower section at least partially covers the base plate, the higher and lower sections giving a space inside the display module but outside the protecting cover, the space having a height corresponding to a step created by the higher and lower sections and being located between the specific zone and the edge section of the rear surface section of the base plate, wherein the fixing component is at least partially installed in the space and attached to the base plate. 
     Furthermore, the present invention provides a display apparatus comprising: a cover; a display module; and a fixing component to fix the display module to the cover, wherein the display module includes: a base plate having a front surface section and a rear surface section that has at least one edge section; a display panel provided on the front surface section of the base plate; a circuit board provided in a specific zone of the rear surface section of the base plate in which the specific zone is closer to the edge section of the rear surface section of the base plate than a center of the rear surface section is; and a protecting cover to protect the circuit board and the base plate wherein the protecting cover has a higher section and a lower section that is closer to the base plate than the higher section is so that the higher section at least partially covers the circuit board while the lower section at least partially covers the base plate, the higher and lower sections giving a space inside the display module but outside the protecting cover, the space having a height corresponding to a step created by the higher and lower sections and being located between the specific zone and the edge section of the rear surface section of the base plate, wherein the fixing component is at least partially installed in the space and attached to the base plate. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  shows external perspective views of a display apparatus according to the present invention, in which (a) and (b) show the rear and front sides, respectively, of the display apparatus viewed from above; 
         FIG. 2  shows a fragmentary perspective view of a display apparatus according to the present invention; 
         FIG. 3  is a perspective view illustrating a short bracket to be used as a first component of a fixing structure for a display apparatus according to the present invention; 
         FIG. 4  is a perspective view illustrating a long bracket used as a second component of the fixing structure for a display apparatus according to the present invention; 
         FIG. 5  is a perspective view illustrating an angle bracket used as a third component of the fixing structure for a display apparatus according to the present invention; 
         FIG. 6  is a perspective view illustrating a display module installed in a display apparatus according to the present invention; 
         FIG. 7  is a partial enlarged view illustrating a base section of the display module shown in  FIG. 6 , according to the present invention; 
         FIG. 8  is a perspective view of a protecting cover used for a liquid crystal display module installed in a display apparatus according to the present invention; 
         FIG. 9  is a partial sectional view illustrating a display panel shown in (a) of  FIG. 1 , taken on line S 1 -S 1  of  FIG. 6 ; 
         FIG. 10  is a partial sectional view illustrating a modification to a display module installed in a display apparatus according to the present invention, taken on line S 1 -S 1  of  FIG. 6 ; 
         FIG. 11  is a plan view illustrating a fixing structure for a display apparatus according to the present invention; 
         FIG. 12  is a perspective view illustrating the fixing structure for a display apparatus according to the present invention; 
         FIG. 13  is a plan view illustrating the fixing structure for a display apparatus according to the present invention; 
         FIG. 14  is a plan view illustrating the fixing structure for a display apparatus according to the present invention; 
         FIG. 15  is a perspective view illustrating the fixing structure for a display apparatus according to the present invention; and 
         FIG. 16  is a perspective view illustrating a known display module. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     In the following disclosure and throughout the drawings, the same or analogous elements or components are given the same numerals or signs, the overlapping description being omitted if not necessary. 
       FIG. 1  shows external perspective views of a display apparatus  50  according to the present invention, in which (a) and (b) show the rear and front sides, respectively, of the display apparatus viewed from above. 
     The display apparatus  50  shown in  FIG. 1  is a 46-inch television equipped with a liquid crystal display module  1 , in this embodiment, that consists of: a display panel  50 A having the display module  1  installed therein; and a mount  50 B to support the display panel  50 A so that the display panel  50 A can be turned in the perpendicular and lateral directions. 
     The display panel  50 A has a housing  4  with a front cover  2  that is a frame and a rear cover  3  that is a flat box with an opening on one side. Installed in the housing  4  is the liquid crystal display module  1  held by a fixing structure which will be described later. 
     Formed on the rear cover  3  is a protruding cover section  3   a  that protrudes in the rear side, as shown in (a) of  FIG. 1 . Installed in the cover section  3   a  are a circuit board for television signal processing, a power supply, etc. (not shown). 
     In the rear cover  3 , the zone except for the protruding cover section  3   a  is referred to as a reference rear section  3   b , hereinafter. The plane of the reference rear section  3   b  is referred to as a reference rear plane  3   bf , hereinafter. 
     The front cover  2  has an opening  2   a  for a screen  1   a  of the liquid crystal display module  1  to be installed, as shown in (b) of  FIG. 1 . The frame section that surrounds the opening  2   a  is referred to as an edge section  2   c . The front-side plane of the front cover  2  is referred to as a reference front plane  2   b , hereinafter. 
     In (a) and (b) of  FIG. 1 , the dimensions of the housing  4  are defined as follows: 
     TK: a thickness of the reference rear section  3   b , the zone except for the protruding cover section  3   a , corresponding to the distance between the reference front plane  2   b  and the reference rear plane  3   bf;    
     WT: a width between the upper edge of the front cover  2  and the opening  2   a;    
     WL: a width between the left-side edge of the front cover  2  and the opening  2   a ; and 
     WR: a width between the right-side edge of the front cover  2  and the opening  2   a.    
     According to the definition, a smaller thickness TK provides a thinner display panel  50 A and shorter distances WT, WL and WR provide a narrower edge section  2   c.    
       FIG. 2  shows an exploded perspective view of the display panel  50 A viewed from the rear side, illustrating how the display panel  50 A is assembled which is described below. 
     Two short brackets  5  (four short brackets in total) are attached to the liquid crystal display module  1  on both side edges and slid along the side edges by a specific distance. Then, the brackets  5  are engaged with side ribs (not shown in  FIG. 2  and which will be described later) provided on the front cover  2  and fixed to the liquid crystal display module  1  with male screws S 5 . 
     Likewise, two long brackets  6  are attached to the liquid crystal display module  1  on the upper edge and slid along the upper edge by a specific distance. Then, the brackets  6  are engaged with upper ribs (not shown in  FIG. 2  and which will be described later) provided on the front cover  2  and fixed to the liquid crystal display module  1  with male screws S 6 . 
     Moreover, a pair of angle brackets  7  are attached to the liquid crystal display module  1  on both side edges and slid along the side edges upwards by a specific distance. Then, the brackets  7  are engaged with side ribs and upper side ribs (not shown in  FIG. 2  and which will be described later) provided on the front cover  2  and fixed to the liquid crystal display module  1  with male screws S 7 . 
     With the assembly procedure described above, the liquid crystal display module  1  is fit in the front cover  2  from the rear side of the front cover  2 , with the short brackets  5 , the long brackets  6 , and the angle brackets  7  being engaged with several ribs after the brackets are slid in the orthogonal or lateral direction. 
     Although not shown in  FIG. 2 , the ribs are provided on both edges  2   e  and an upper edge  2   f  of a frame section  2   c  of the front cover  2 , as protruding to the rear side of the front cover  2 . The ribs can be formed by injection molding with a slide core mold. 
     The slide mechanism provided for each of the brackets  5  to  7  will be described later in detail. 
     The liquid crystal display module  1  is then fixed to the front cover  2  with the male screws S 5  to S 7 . 
     The liquid crystal display module  1  is also fixed to the rear cover  3  with male screws S 3  that are screwed into female screws (not shown) formed on the brackets  5  to  7 , which will be described later in detail. 
     In this procedure, all of the male screws S 3 , S 5 , S 6  and S 7  are screwed from the rear to the front side, as shown in  FIG. 2 , thus achieving an efficient assembly procedure. 
     Moreover, the male screws S 3 , S 5 , S 6  and S 7  are not exposed to the front side of the front cover  2  but to the front side of the rear cover  3  (the rear side of the display panel  50 A), thus maintaining a good appearance. 
       FIG. 3  is a perspective view illustrating each of the four short brackets  5  shown in  FIG. 2 . 
     The short bracket  5  is made of a pressed sheet metal, having a rectangular-like base section  5   a  and a two-step bent section  5   f  connected to the base section  5   a  at one longitudinal side thereof. 
     The two-step bent section  5   f  has a first bent section  5   b  and a second bent section  5   c . The first bent section  5   b  is formed as being oblique to the base section  5   a  at about 45 degrees. The second bent section  5   c  is formed as being oblique to the base section  5   a  at about 90 degrees, or formed as having a reflex angle θ of about (270+α) degrees (α being a positive integer) to the base section  5   a.    
     The angle a is also an oblique angle of an inner surface  2   e   1 , shown in  FIG. 10 , of each edge  2   e  of the frame section  2   c  ( FIG. 2 ). The sign V in  FIG. 10  indicates a line perpendicular to the screen  1   a.    
     The two-step bent section  5   f  has slits  5   d  formed on both ends in a way that each slit  5   d  straddles the first and second bent sections  5   b  and  5   c . Each slit  5   d  is provided so that it can engage with a rib  2   d  provided to the front cover  2  ( FIG. 2 ), as shown in  FIG. 12 , which will be described later in detail. 
     Formed in the center of the base section  5   a  is a protruding section  5   a   1 , that sticks out from the base section  5   a  in a direction opposite to the two-step bent section  5   f , provided with a female screw  5   a   2 . Formed along the protruding section  5   a   1  is a long oval hole  5   e  lying in the longitudinal direction of the base section  5   a . Also formed on the base section  5   a  are a pair of through holes  5   a   3  on both sides of the protruding section  5   a   1 . 
       FIG. 4  is a perspective view illustrating each of the two long brackets  6  shown in  FIG. 2 . 
     The long bracket  6  is made of a pressed sheet metal, having a rectangular-like base section  6   a  and a two-step bent section  6   f  connected to the base section  6   a  at one longitudinal side thereof. 
     The two-step bent section  6   f  has a first bent section  6   b  and a pair of second bent sections  6   c   1  and  6   c   2  connected to the first bent section  6   b  at both ends thereof. The first bent section  6   b  is formed as being oblique to the base section  6   a  at about 45 degrees. The second bent sections  6   c   1  and  6   c   2  are formed as being oblique to the base section  6   a  at about 90 degrees, or formed as having a reflex angle θ of about (270+β) degrees (β being a positive integer) to the base section  6   a . The angle β is also an oblique angle of the inner surface of the upper edge  2   f  of the frame section  2   c  ( FIG. 2 ). 
     Provided to the first bent section  6   b  and the second bent section  6   c   1  is a slit.  6   d   1  formed in a way that the slit  6   d   1  straddles the first bent section  6   b  and the second bent section  6   c   1 . Provided to the second bent section  6   c   2  is a tongue piece  6   c   3  that sticks out from an end  6   bt  of the first bent section  6   b . The slit  6   d   1  and the tongue piece  6   c   3  are provided so that they can engage with ribs  2   f   5  and  2   f   6 , respectively, both provided to the upper edge  2   f  of the frame section  2   c  of the front cover  2  ( FIG. 2 ), as shown in  FIG. 13 , which will be described later in detail. 
     The base section  6   a  is provided with a female screw  6   a   2 , a pair of long oval holes  6   e  lying in the longitudinal direction of the base section  6   a , and also a pair of through holes  6   a   3  adjacent to the long oval holes  6   e  in the longitudinal direction. 
       FIG. 5  is a perspective view illustrating each of the two angle brackets  7  shown in  FIG. 2 . 
     The angle bracket  7  is made of a pressed sheet metal, having a rectangular-like base section  7   a , a two-step bent section  7   j  connected to the base section  7   a  at one longitudinal side thereof, and a three-step bent section  7   k  connected to the base section  7   a  at one longitudinal end thereof. 
     The two-step bent section  7   j  has a first bent section  7   b  and a second bent section  7   c . The first bent section  7   b  is formed as being oblique to the base section  7   a  at about 45 degrees. The second bent section  7   c  is formed as being oblique to the base section  7   a  at about 90 degrees, or formed as having a reflex angle θ of about (270+β) degrees (β being a positive integer) to the base section  7   a . The angle β is also an oblique angle of the inner surface of the upper edge  2   f  of the frame section  2   c  ( FIG. 2 ). 
     Provided to the first and second bent sections  7   b  and  7   c  is a slit  7   d  formed in a way that the slit  7   d  straddles the bent sections  7   b  and  7   c . The slit  7   d  is provided so that it can engage with a rib  2   d   2  provided to the side edge  2   e  of the frame section  2   c  of the front cover  2  ( FIG. 2 ), as shown in  FIG. 14 , which will be described later in detail. 
     The three-step bent section  7   k  has a first bent section  7   f , a second bent section  7   g , and a third bent section  7   h . The first and second bent sections  7   f  and  7   g  are formed as being oblique to the base section  7   a  at about 45 and 90 degrees, respectively. The third bent section  7   h  is formed as being bent outwards so that it lies as parallel to the base section  7   a.    
     Provided to the second and third bent sections  7   g  and  7   h  is a slit  7   i  formed in a way that the slit  7   i  straddles the bent sections  7   g  and  7   h . The slit  7   i  is provided so that it can engage with a rib  2   f   1  provided to the upper edge  2   f  of the frame section  2   c  of the front cover  2  ( FIG. 2 ), as shown in  FIG. 15 , which will be described later in detail. 
     Formed on the base section  7   a  is a protruding section  7   a   1 , that sticks out from the base section  7   a  in a direction opposite to the two- and three-step bent sections  7   j  and  7   k , provided with a female screw  7   a   2 . Formed along the protruding section  7   a   1  is a long oval hole  7   e  lying in the longitudinal direction of the base section  7   a . Also formed on the base section  7   a  is a through hole  7   a   3 . 
     Described next is the liquid crystal display module  1  ( FIG. 1 ) with reference to  FIGS. 6 to 14 . 
       FIG. 6  is a perspective view illustrating the liquid crystal display module  1  viewed from the rear side thereof. 
     In  FIG. 6 , the liquid crystal display module  1  is provided with: a base plate  1   b  made of a sheet metal; several cold cathode fluorescent lamps  1   c  (referred to as CCFL  1   c , hereinafter, not shown in  FIG. 6  but in  FIGS. 1 and 9 ) arranged in parallel, each CCFL  1   c  lying in the longitudinal direction H; a pair of circuit boards  1   d  (inverter circuit boards in this embodiment) arranged on both sides of the module  1  in the rear side thereof, fixed to the base plate  1   b  with male screws (not shown); a pair of protecting covers  1   e  made of resin to cover the inverter circuit boards  1   d ; and also a light-diffusing panel assembly  11  and a liquid crystal display panel  12  (both shown in  FIG. 10 ) arranged in front of the CCFLs  1   c.    
     Mounted on each circuit board  1   d  are inverter circuits  1   dk  ( FIG. 9 ) that supply voltages to the CCFL  1   c.    
     The liquid crystal display module  1  is supported by a frame section  1   j  in which the base plate  1   b  is installed. 
     The resin-made protecting covers  1   e  protect the inverter circuit boards  1   d  from damages and provide them with insulation. Moreover, the protecting covers  1   e  are provided so that a maintenance or service man can be protected from touching a high-voltage section, such as transformers  1   d   1 , in the liquid crystal display module  1 , and the module  1  can be protected from being damaged while shipped. 
     Provided on each protecting cover  1   e  are through holes  1   e   9  through which the transformers  1   d   1  are exposed, as described later. 
     The wiring between the inverter circuit boards  1   d  and the CCFLs  1   c  is described with reference to  FIG. 9 , a sectional view of the display panel  50 A shown in (a) of  FIG. 1 , taken on line S 1 -S 1  of  FIG. 6 . 
     In  FIG. 9 , each CCFL  1   c  is provided with electrodes  1   c   1  on both ends, which is supported by rubber spacers  1   h  fixed as being engaged with long oval holes  1   b   1  of the base plate  1   b . Each electrode  1   c   1  is connected with flexible CCFL wirings  1   g  to a connector  1   i  mounted on the associated inverter circuit board  1   d  at one end. 
     The wiring is also shown in  FIG. 11 , a plan view illustrating the fixing structure with each short bracket  5  ( FIG. 2 ). 
       FIG. 11  shows the long oval hole  1   b   1  ( FIG. 9 ) provided on the base plate  1   b  as being opened in the longitudinal direction along each of the left and right sides of the frame section  2   c  ( FIG. 2 ). 
     Each rubber spacer  1   h  can be seen through the long oval hole  1   b   1 . The rubber spacer  1   h  is provided with a pair of wire supporters  1   h   1  formed as protruding from the spacer  1   h . The wire supporters  1   h   1  go through the long oval hole  1   b   1  at both ends, as if each hole end is pinched by the associated supporter  1   h   1 , and stick out from the base plate  1   b  to the rear side ( FIG. 1 ). The rubber spacer  1   h  are thus fixed to the base plate  1   b  with the wire supporters  1   h   1 . Led out from the wire supporters  1   h   1  are the CCFL wirings  1   g.    
     The base plate  1   b  is provided with four base sections  1   f  at the upper edge, formed by stamping, as protruding from the base plate  1   b  in the rear side, as shown in  FIG. 6 . 
       FIG. 7  is a partial enlarged view illustrating each base section  1   f . Provided on the base section  1   f  are a dowel  1   f   1  and a female screw  1   f   2 . The dowel  1   f   1  is engaged with the associated long oval hole  6   e  of the long bracket  6  ( FIG. 4 ) so that the bracket  6  is slidable along the upper edge of the display panel  50 A in  FIG. 2 . 
     The slide mechanism of the long bracket  6  allows the slit  6   d   1  and the tongue piece  6   c   3  (both shown in  FIG. 4 ) to be engaged with the ribs  2   f   5  and  2   f   6 , respectively, of the front cover  2  ( FIG. 13 ). After the engagement, each screw S 6  ( FIG. 2 ) is inserted into the through hole  6   a   3  ( FIG. 4 ) and screwed into the female screw  1   f   2  ( FIG. 7 ) to fix the long bracket  6  to the base plate  1   b  ( FIG. 6 ), as shown in  FIG. 2 . 
     In  FIG. 6 , the number of the transformers  1   d   1  mounted on the inverter circuits  1   d  for supplying high voltages to the CCFLs  1   c  is equal to the number of the CCFLs  1   c . Each transformer  1   d   1  is much higher than other components mounted on the associated inverter circuit  1   d . Thus, the through holes  1   e   9  are provided on the protecting covers  1   e  for the transformers  1   d   1  to be exposed therethrough to give a small thickness TK to the reference rear section  3   b  of the housing  4  in (a) of  FIG. 1 . 
     Described next with reference to  FIGS. 8 and 9  is each resin-made protecting cover  1   e  shown in  FIG. 6 .  FIG. 8  is a perspective view of the protecting cover  1   e .  FIG. 9  is a sectional view of the display panel  50 A shown in (a) of  FIG. 1 , taken on line S 1 -S 1  of  FIG. 6 , as already mentioned. 
     As shown in  FIG. 8 , the protecting cover  1   e  is a rectangular-like flat cover provided with a stepped section  1   e   3  on a longitudinal edge section  1   et  side. 
     In  FIGS. 8 and 9 , the protecting cover  1   e  has: a higher section  1   e   1  that covers a zone AR 1  in which the inverter circuit boards  1   d  are located; and a lower section  1   e   2  that covers a zone AR 2 , outside the zone AR 1  in the longitudinal edge section let side, in which the wire supporters  1   h   1  are located. The lower section  1   e   2  is located closer to the base plate  1   b  than the higher section  1   e   1  is. Several dowels  1   e   4 , also shown in  FIG. 10 , are provided to the lower section  1   e   2  at a specific interval along the longitudinal edge section  1   et.    
     The stepped section  1   e   3  on the border of the zones AR 1  and AR 2  is located in a zone AR 3 , outside (in the left side in  FIG. 9 ) an edge  1   d   2  of each inverter circuit board  1   d , in which the CCFL wirings  1   g  are lying. 
     Since the CCFL wirings  1   g  are flexible, they can be provided as being bent on the stepped section  1   e   3 , thus achieving higher space utility. 
     Each CCFL wiring  1   g  may be provided so that its end at the associated inverter circuit board  1   d  side is positioned at the inner side than the edge  1   d   2  of the circuit board  1   d , as shown in  FIG. 10  (a modification). In such an arrangement, the stepped section  1   e   3  ( FIG. 8 ) is preferably located in a zone AR 31  within the zone AR 3  but terminated at the edge  1   d   2 . 
     The degree of step of the stepped section  1   e   3  in the thickness direction, or the front-to-rear (thickness) direction is referred to as a step degree D 4 , as shown in  FIGS. 8 to 10 . 
     In  FIGS. 9 and 10 , each inverter circuit board  1   d  is provided as its edge  1   d   2  is positioned at a point H 2  located inside the frame section  1   j  by a distance DD from a point H 1  that is the position of an inner side face  1   j   2  (shown only in  FIG. 10 ) of the frame section  1   j.    
     In each protecting cover  1   e , as already described, the lower section  1   e   2  is located closer to the base plate  1   b  than the higher section  1   e   1  is. Here, the lower section  1   e   2  covers the zone AR 2  in which the wire supporters  1   h   1  are located. The higher section  1   e   1  covers the zone AR 1  in which the inverter circuit boards  1   e  are located. 
     The configuration described above provides spaces KS on both sides of the display panel  50 A, each space KS corresponding to the step degree D 4  of the stepped section  1   e   3  of the associated protecting cover  1   e , on the rear side of the lower section  1   e   2  of the protecting cover  1   e.    
     Then, the short brackets  5  are provided as the base sections  5   a  of the brackets  5  are installed in the spaces KS described above, which allows the thickness TK of the display panel  50 A to be thinner with no effects of the thickness of each bracket  5  and other components associated with the bracket  5 . 
     In  FIG. 11 , a plan view illustrating the fixing structure with the short bracket  5  ( FIG. 2 ), the short bracket  5  is configured as slidable in a direction Ds while the long oval hole  5   e  ( FIG. 3 ) is engaged with the associated dowel  1   e   4  ( FIG. 8 ) of the protecting cover  1   e.    
     Then, as shown in  FIG. 12 , the slide mechanism allows one of the slits  5   d  ( FIG. 3 ) of each short bracket  5  to be engaged with the rib  2   d  of the front cover  2  ( FIG. 2 ) so that the short bracket  5  is positioned at a certain location in the front-to-rear (thickness) direction. In  FIG. 12 , the rib  2   d  is formed as protruding inwardly from the side edge  2   e  in the frame section  2   c  of the front cover  2 . 
     When one of the slits  5   d  ( FIG. 3 ) of each short bracket  5  is engaged with the rib  2   d  of the front cover  2 , as shown in  FIGS. 11 and 12 , the screw S 5  ( FIG. 2 ) is inserted into one of the through holes  5   a   3  and also one of several holes  1   e   5  provided on each protecting cover  1   e , as shown in  FIG. 8 , and then screwed into a female screw (not shown) of the base plate ( FIG. 6 ). Illustrated in  FIG. 11  is that the screw S 5  is inserted into the through hole  5   a   3  and the hole  1   e   5 . 
     The fixing structure described above offers a short distance D 2  between the outer surface of the frame section  1   j  of the liquid crystal display module  1  and the inner surface  2   e   1  of the edge  2   e  of the frame section  2   c  of the frame cover  2 , as shown in  FIG. 9 . The distance D 2  is very short almost equal to the thickness of each short bracket  5  with a narrow margin, thus achieving smaller widths WL and WR in (b) of  FIG. 1 . 
     Such a short distance D 2  is also achieved by providing the second bent section  5   c  of each short bracket  5  so that the bent section  5   c  lies on the slant inner surface of the front cover  2  at the reflex angle e of about (270+α) degrees (α being a positive integer) to the base section  5   a.    
     In  FIG. 13 , a plan view illustrating the fixing structure with each long bracket  6  ( FIG. 2 ), the long bracket  6  is configured as slidable in a direction Ds 2  while each long oval hole  6   e  ( FIG. 4 ) is engaged with the dowel  1   f   1  ( FIG. 7 ) of the associated base section  1   f  of the base plate  1   b  ( FIG. 6 ). 
     Then, as shown in  FIG. 13 , the slide mechanism allows the slit  6   d   1  and the tongue piece  6   c   3  ( FIG. 4 ) of each long bracket  6  to be engaged with the ribs  2   f   5  and  2   f   6 , respectively, of the front cover  2  ( FIG. 2 ) so that the long bracket  6  is positioned at a certain location in the front-to-rear (thickness) direction, or in the direction orthogonal to the plan view of  FIG. 13 . In  FIG. 13 , the ribs  2   f   5  and  2   f   6  are formed as protruding inwardly from the upper edge  2   f  of the frame section  2   c  of the front cover  2 . 
     When the slit  6   d   1  and the tongue piece  6   c   3  of each long bracket  6  are engaged with the ribs  2   f   5  and  2   f   6 , respectively, of the front cover  2 , as shown in  FIG. 13 , the screws S 6  ( FIG. 2 ) are inserted into the through holes  6   a   3  and screwed into the female screws  1   f   2  ( FIG. 7 ) of the associated base section  1   f  of the base plate  1   b  ( FIG. 6 ), thus long bracket  6  being fixed on the base plate  1   b.    
     The fixing structure described above offers a short distance D 3  between the outer surface of the frame section  1   j  of the liquid crystal display module  1  and the inner surface  2   f   2  of the upper edge  2   f  of the frame section  2   c  of the frame cover  2 , as shown in  FIG. 13 . The distance D 3  is very short almost equal to the thickness of each long bracket  6  with a narrow margin, thus achieving a smaller width WT in (b) of  FIG. 1 . 
     In  FIG. 14 , a plan view illustrating the fixing structure with each angle bracket  7  ( FIGS. 2 and 5 ), the angle bracket  7  is configured as slidable in a direction Ds along a long oval hole  7   e  while the hole  7   e  is engaged with one of the dowels  1   e   4  ( FIG. 8 ) of the associated protecting cover  1   e.    
     Then, as shown in  FIG. 15 , the slide mechanism allows the slit  7   d  ( FIG. 5 ) of each angle bracket  7  to be engaged with a rib  2   d   2  of the front cover  2  ( FIG. 2 ) so that the angle bracket  7  is positioned at a certain location in the front-to-rear (thickness) direction. In  FIG. 14 , the rib  2   d   2  is formed as protruding inwardly from the side edge  2   e  in the frame section  2   c  of the front cover  2 .  FIG. 15  is a fragmentary perspective view of the frame section  2   c  and the angle bracket  7  of  FIG. 14 , viewed from lower right in  FIG. 14 . 
     Moreover, in  FIG. 15 , the slide mechanism allows the slit  7   i  ( FIG. 5 ) of each angle bracket  7  to be engaged with a rib  2   f   1  of the front cover  2  ( FIG. 2 ) so that the angle bracket  7  is positioned at a certain location in the front-to-rear (thickness) direction. In  FIG. 15 , the rib  2   f   1  is formed as protruding inwardly from the upper edge  2   f  in the frame section  2   c  of the front cover  2 . The rib  2   f   1  is constituted by a longitudinal rib  2   f   1   a  that lies in the thickness direction in which the slit  7   c  receives the rib  2   f   1   a  and a lateral rib  2   f   1   b  that touches an upper surface  7   ht  of the third bent section  7   h  of the three-step bent section  7   k  ( FIG. 5 ) to prevent the angle bracket  7  from being detached. 
     The engagement of the slits  7   d  and  7   i  with the ribs  2   d  and  2   f   1 , respectively, prevents the front panel  2  from being deformed which otherwise tends to occur at the corners of the panel  2  for a larger screen. 
     As already described, when one of the slits  5   d  of each short bracket  5  ( FIG. 3 ) is engaged with the rib  2   d  of the front cover  2 , as shown in  FIGS. 11 and 12 , the screw S 5  ( FIG. 2 ) is inserted into one of the through holes  5   a   3  and also one of the holes  1   e   5  provided on each protecting cover  1   e , as shown in  FIG. 8 , and then screwed into a female screw (not shown) of the base plate  1   b  ( FIG. 6 ). 
     The fixing structure described above offers a short distance D 2  between the outer surface of the frame section  1   j  of the liquid crystal display module  1  and the inner surface  2   e   1  of the edge  2   e  of the frame section  2   c  of the frame cover  2 , as shown in  FIG. 9 . The distance D 2  is very short almost equal to the thickness of each short bracket  5  with a narrow margin, thus achieving smaller widths WL and WR in (b) of  FIG. 1 . 
     For the angle brackets  7 , when the slits  7   d  and  7   i  of each bracket  7  ( FIG. 5 ) are engaged with the ribs  2   d   2  and  2   f   1  of the front cover  2 , as shown in  FIG. 14 , the screw S 7  ( FIG. 2 ) is inserted into the through hole  7   a   3  ( FIG. 5 ) of the bracket  7 , and then screwed into a female screw (not shown) of the base plate  1   b  ( FIG. 6 ). 
     The fixing structure described above offers a short distance D 3  between an outer surface  1   j   2  of the frame section  1   j  of the liquid crystal display module  1  and an inner surface  2   f   2  of the frame section  2   c  of the frame cover  2 , as shown in  FIG. 13 . The distance D 2  is very short almost equal to the thickness of each angle bracket  7  with the thickness of the ribs  2   d   2  and  2   f   1  and also a narrow margin, thus achieving narrower width WT in (b) of  FIG. 1 . 
     When the short, long, and angle brackets  5 ,  6 , and  7  are fixed to the base plate  1   b  with the screws S 5 , S 6 , and S 7 , respectively, the male screws S 3  are screwed into the female screws  5   a   2 ,  6   a   2 , and  7   a   2  of the brackets  5 ,  6 , and  7 , shown in  FIGS. 3 ,  4 , and  5 , respectively, via through holes  3   c  of the rear cover  3 , to fix the rear cover  3  to the liquid crystal display module  1 , as shown in  FIG. 2 . 
     As shown in  FIG. 9 , the through holes  3   c  are provided in counterbores  3   z  of the rear cover  3  which are provided as entering the space KS on both sides of the display panel  50 A. A screw head S 3   t  of each male screw S 3  is allowed to remain in the associated counterbore  3   z  and thus prevented from protruding from the reference rear plane  3   bf  of the rear cover  3 , shown in (a) of  FIG. 1 , thus achieving a thinner liquid crystal display module  1 . 
     As described above, the liquid crystal display module  1  is fixed to the front cover  2  with the short, long, and angle brackets  5 ,  6 , and  7  using the ribs  2   d ,  2   d   2 ,  2   f   1 ,  2   f   5 , and  2   f   6  formed on the front cover  2  and to the rear cover  3  with the brackets  5 ,  6 , and  7  with the screws S 3 . 
     The ribs  2   d ,  2   d   2 ,  2   f   1 ,  2   f   5 , and  2   f   6  are chamfered at their summits, as shown with a sign C in  FIGS. 9 ,  10 ,  12 , and  15 , by which the liquid crystal display module  1  is smoothly and easily guided and fixed to the front cover  2 . The height of each rib is adjusted as its summit almost touches the frame section  1   j.    
     The ribs  2   d ,  2   d   2 ,  2   f   1 ,  2   f   5 , and  2   f   6  adjusted as described above allow the liquid crystal display module  1  to be fixed to the front cover  2  at an accurate position, particularly, with respect to the opening  2   a  through which the screen  1   a  is exposed, as shown in (b) of  FIG. 1 , thus appropriate for mass production. 
     Moreover, since the heights of the ribs  2   d ,  2   d   2 ,  2   f   1 ,  2   f   5 , and  2   f   6  are adjusted as their summits almost touch the frame section  1   j , the ribs immediately touch and prevent the frame section  1   j  from being deformed when the front cover  2  is pressed by fingers for example, thus providing a highly rigid housing  4 . 
     Furthermore, as already described, the short, long and angle brackets  5 ,  6  and  7  are provided with the first bent sections  5   b ,  6   b  and  7   f , respectively. The bent sections  5   b ,  6   b  and  7   f  are formed as oblique to the base sections  5   a ,  6   a  and  7   a , respectively, at about 45 degrees, as shown in  FIGS. 3 ,  4  and  5 , respectively. The configuration to the brackets  5 ,  6  and  7  allows a side face  3   m  ( FIG. 9 ) of the rear cover  3  to be formed as being tapered to the rear side which makes the display panel  50 A ( FIG. 1 ) look like a slim panel, thus effective in panel design. 
     Although not limited, the following are recommended materials for the several components described above: 
     ABC resin for: the front cover  2 , rear cover  3 , and protecting covers  1   e;    
     Zinc-coated steel sheet (t  1 . 0 ) for: the short, long and angle brackets  5 ,  6 ,  7 ; 
     Silicon rubber for: the rubber spacers  1   h ; and 
     SPCC (Cold Rolled Steel Sheet, t  1 . 0 ) for: the base plate  1   b  and frame section  1   j.    
     Moreover, although not limited, the following are recommended dimensions for the several components described above: 
     In (a) and (b) of  FIG. 1 , 
     39 mm: the thickness TK; and 
     23 mm: WL, WR, and Wt. 
     In FIG.  9 ,. 
     32.5 mm: the zone ARD; 
     14.5 mm: the zone AR 2 ; 
     9.5 mm: the zone AR 3 ; 
     23.3 mm: the distance D 1 ; and 
     5.0 mm: the distance D 2 ; 
     In  FIG. 13 , 
     5.0 mm: the distance D 3 ; 
     In  FIG. 8 , 
     5.6 mm: the step degree D 4  of each protecting cover  1   e ; and 
     550 mm: the length Lc of each protecting cover  1   e  in longitudinal direction. 
     As described in detail, the inverter circuits  1   d  are installed in the liquid crystal display module  1  so that the edge of each circuit  1   d  is positioned inside the left and right side faces of the module  1 . This installation gives the space KS ( FIG. 9 ) on both sides of the circuit  1   d , that corresponds to the thickness of each circuit  1   d.    
     The space KS creates a rectangular shape in the liquid crystal display module  1 , constituted by the length Lc of each protecting cover  1   e  in the longitudinal direction, the step degree D 4  of the stepped section  1   e   3 , and zone AR 2  of the lower section  1   e   2 , shown in  FIG. 8 . The volume V of the space KS is then given as V=Lc×D 4 ×AR 2 . 
     Provided in each space KS is a fixing means for fixing the liquid crystal display module  1  to the housing  4 , which makes the housing  4  thinner at the location in which the fixing means is provided than at the location in which each inverter circuit  1   d  is installed, thus achieving a thinner housing  4 . 
     The fixing means installed in the spaces KS described above are the short and angle brackets  5  and  7 , in this embodiment, with the sheet-metal bent sections having the slits  5   d  and  7   d , respectively, engaged with the ribs  2   d , and  2   d   2  and  2   f   1 , respectively, formed as protruding from the housing to inside, to fix the liquid crystal display module  1  in the housing  4 . The fixing structure allows the gap between the module  1  in the housing  4  to be narrow as almost corresponding to the thickness of the the short and angle brackets  5  and  7 . 
     Therefore, the display apparatus  50  having the configuration with the fixing structure described above can have a narrow edge section  2   c  concerning the widths WL, WR, and WT, as shown in (b) of  FIG. 1 . 
     It is further understood by those skilled in the art that the foregoing description is a preferred embodiment of the disclosed apparatus and that various changes and modifications may be made in the invention without departing from the spirit and scope of thereof. 
     For example, in the present invention, the angle brackets  7  are not essential components for a display apparatus with a relatively small display panel. Nevertheless, the angle brackets  7  are very effective components for a display apparatus with a large (for example, 42 inches or larger) display panel, to effectively prevent the front cover  2  from being deformed. 
     The display apparatus  50  described above requires the mount  50 B to support the display panel  50 A. However, the present invention is applicable to a display apparatus with no such mount, such as a hung-on-wall type. 
     Although the display apparatus  50  described above is a 46-inch television, the present invention is applicable to any screen size. 
     Although the display module  1  described above is a liquid crystal display module, the present invention is applicable to any types of display module, such as an organic electro-luminescence type. 
     Although the light sources described above are the CCFL  1   c  for the liquid crystal display module  1 , the present invention can employ other tube-type light sources, such as EEFL, with inverter circuit boards are smaller or larger than those for CCFL. 
     Although the circuit boards  1   d  described above are the inverter circuit boards, any types of circuit boards are available in the present invention. 
     When the light source to be used is not CCFL, thus with no such CCFL wirings described above, the front cover is provided for protecting the circuit boards from damages in shipping, maintenance, etc., but still, the space KS described above is created. 
     Therefore, no matter what type of tube light source is used, the following technical idea of the present invention already discussed is applicable: the fixing means for fixing the display module  1  to the housing  4  allows the housing  4  to be made thinner at the location in which the fixing means is provided than at the location in which each inverter circuit  1   d  is installed, thus achieving a thinner housing  4 . 
     Moreover, the fixing structure described above can be provided at the upper and lower edges of the housing  4  when the circuit boards  1   d  are provided at the upper and lower edges of the display module  1 . 
     As disclosed above in detail, the present invention achieves a thinner display panel held by a frame having a narrower edge that surrounds the display panel.