PATENT DOCUMENT

Abstract:
A liquid crystal display comprises a liquid crystal panel ( 22 ), a group of optical sheets ( 32 ) disposed rearward from the liquid crystal panel ( 22 ), a light source ( 28 ) disposed rearward from the group of the optical sheets ( 32 ), a frame-shaped front frame ( 21, 23 ) disposed forward from at least the group of the optical sheets ( 32 ), a back chassis ( 31 ) disposed rearward from the light source ( 28 ) and fixedly connected to the front frame ( 21, 23 ) directly or indirectly, and a holding member ( 27 ) integrally holding the group of the optical sheets ( 32 ) to keep the group of the optical sheets ( 32 ) held in position integrally, when the back chassis ( 31 ) and the front frame ( 21, 23 ) are unfixed from each other.

Full Description:
[0001]     This nonprovisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No(s). 2004-006797 filed in Japan on Jan. 14, 2004, the entire contents of which are hereby incorporated by reference.  
       BACKGROUND OF THE INVENTION  
       [0002]     1. Field of the Invention  
         [0003]     The present invention relates to a liquid crystal display in which a light source is disposed at a rear side of a liquid crystal panel.  
         [0004]     2. Description of the Related Art  
         [0005]     In the liquid crystal display, a back light which is a flat light source is disposed at the rear side of the liquid crystal panel thereof. The “vertical” type and the “edge light” type are known as the type of the back light. In the former type, a plurality of light sources is disposed at the rear side of the liquid crystal panel. In the latter type, a light source is disposed on the side surface of the liquid crystal panel so that a light guide plate emits light flatly. The back light of the vertical type is thick but has a high light utilization efficiency. Thus the back light of the vertical type is used for a monitor, a liquid crystal television, and the like that require brightness.  
         [0006]     The life of the liquid crystal display almost depends on the life of the light source of the back light. The liquid crystal display can be used semi-permanently by performing maintenance of replacing the light source when it has failed with a new one.  
         [0007]     The following two light source-replacing methods are known. In one method, the liquid crystal display is disassembled. In this method, the liquid crystal panel and the layered optical sheets are removed one by one. Therefore the optical sheets interposed between the liquid crystal panel and the light source are separated from each other. Consequently there is a fear that after the light source-replacing operation finishes, dust enters the gap between the optical sheets and that the liquid crystal display deteriorates in its display quality.  
         [0008]     Therefore this method necessitates the light source-replacing operation to be performed in a particular environment such as a clean room, when the liquid crystal display has failed. Thus a service man and a user cannot perform the light source-replacing operation easily.  
         [0009]     In the other method, the entire back light unit is replaced. This method has a disadvantage that almost all unfailed component parts are replaced. Thus this method costs high.  
         [0010]     When the light source-replacing operation is performed by using the above-described two methods, a secondary damage may occur. More specifically, because the liquid crystal panel is opened in the light source-replacing operation, there easily occurs a defective connection or a disconnection in a driver called a tape-shaped TCP (Tape Carrier Package) which is a member for sending image information to the liquid crystal panel and very weak to an external force applied thereto and a driver called an SOF (System On Film). Consequently the above-described methods cause replacement of even the unfailed liquid crystal panel which is expensive.  
         [0011]     As shown in  FIG. 32 , in the liquid crystal display disclosed in Japanese Patent Application Laid-Open No. 2001-21869, the liquid crystal panel  2 , the back light  3 , and the circuit substrate  4  layered one upon another are accommodated in the casing  5 . The metal frame  1  is placed on the liquid crystal panel  2 . The hook  5   a  of the casing  5  is locked to the locking groove  1   a  of the metal frame  1  to fix the metal frame  1  to the casing  5 . In this construction, the hook  5   a  is unlocked from the locking groove  1   a  to replace the back light  3  with a new one when the back light  3  has failed. As a result, all the members are disassembled and dust attaches to the back light  3  and the liquid crystal panel  2 .  
         [0012]     As shown in  FIG. 33 , in the liquid crystal display disclosed in Japanese Patent Application Laid-Open No. 7-56164, the liquid crystal panel  8  is interposed between the upper casing  6  and the panel-fixing plate  7 . The diffusing plate  9  is disposed under the panel-fixing plate  7 . The back light  11  fixed to the supporting member  10  is disposed under the diffusing plate  9 . The back light  11  is fixed to the upper casing  6  with the screw  13 , and the lower casing  12  is closed. However, neither the method of fixing the back light  11  and the supporting member  10  to each other nor the method of fixing the diffusing plate  9  is disclosed. When the screw  13  is removed in the back light-replacing operation, there is a fear that dust attaches to the diffusing plate  9  and the like.  
         [0013]     Patent document 1: Japanese Patent Application Laid-Open No. 2001-21869  
         [0014]     Patent document 2: Japanese Patent Application Laid-Open No. 7-56164  
       SUMMARY OF THE INVENTION  
       [0015]     The present invention has been made in view of the above-described problems. Therefore it is an object of the present invention to prevent dust from attaching to a group of optical sheets when an operation of removing a failed light source is performed in maintenance of replacing the failed light source of a back light of a liquid crystal display. It is another object of the present invention to replace the failed light source easily without damaging unfailed members in performing the light source-replacing operation to thereby prevent a secondary damage from occurring.  
         [0016]     To solve the above-described problems, the present invention provides a liquid crystal display including a liquid crystal panel, a group of optical sheets disposed rearward from the liquid crystal panel, a light source disposed rearward from the group of optical sheets, a frame-shaped front frame disposed forward from at least the group of optical sheets, a back chassis disposed rearward from light source and fixedly connected to the front frame directly or indirectly, and a holding member integrally holding the group of the optical sheets to keep the group of the optical sheets held in position integrally, when the back chassis and the front frame are unfixed from each other.  
         [0017]     In the above-described construction, in maintenance of replacing the failed light source which has been exposed to the outside because the back chassis has been removed, the group of the optical sheets remains held integrally. Therefore in the light source-replacing operation, it is possible to prevent the optical sheets from being separated from each other and hence dust from entering between the optical sheets. Further the construction eliminates the need for performing the light source-replacing operation in a particular environment such as a clean room. Thus the operability in the maintenance can be improved. Since the optical sheets are not separated from each other, it is unnecessary to perform an operation of assembling the optical sheets when the liquid crystal display is assembled from the constituting members. Therefore it is possible to decrease the number of manufacturing processes.  
         [0018]     It is preferable that the holding member integrally holding the group of the optical sheets is composed of a sheet-holding chassis having a substantially vertical portion projecting from a peripheral edge of the substantially flat portion on which a peripheral edge of a rear side of the group of the optical sheet is placed, and a fastener fixing the sheet-holding chassis to the front frame, and when the front frame and the back chassis are unfixed from each other, the group of the optical sheets remains fixed to the front frame.  
         [0019]     In the above-described construction, it is possible to prevent the group of the optical sheets from being removed toward the removed back chassis by supporting the periphery of the group of the optical sheets by the substantially flat portion of the sheet-holding chassis fixed to the front frame. The substantially vertical portion plays the role of the frame for placing the group of the optical sheets in position and further is capable of playing the role of a spacer for securing a space for vertically disposing the group of the optical sheets. Further the substantially vertical portion is capable of keeping the clearance between the liquid crystal panel and the group of the optical sheets constant. Accordingly the above-described construction allows (prevents nonuniformity) the display quality of the liquid crystal display to be stable. It is preferable to use screws or bolts as the fastener.  
         [0020]     It is preferable that a light source-holding member holding the light source in position is equipped and that the light source-holding member is fastened to the front frame and to the back chassis with a fastener. Alternatively, the light source-holding member and the front frame are fastened to each other with a fastener, and the light source-holding member and the back chassis are fastened to each other with another fastener.  
         [0021]     In the above-described construction, when the light source-holding member, the front frame, and the back chassis are fixed to each other integrally with the fastener, the fastener is screwed in screw holes in one direction. Thereby it is possible to perform a disassembling operation in the one direction and unnecessary to turn the liquid crystal display upside down in the disassembling operation. Consequently it is possible to reduce a load in the light source-replacing operation and prevent the liquid crystal display from being damaged. When the light source-holding member and the front frame are fastened to each other with a fastener, and the light source-holding member and the back chassis are fastened to each other with another fastener, it is preferable to screw a fastener for fixing the back chassis to the light source-holding member into screw holes from the rear side thereof. This construction allows the disassembling operation to be accomplished at a high operability when maintenance can be facilitated by performing the disassembling operation at the rear side thereof. That is, when a member of the liquid crystal display disposed at its upper side is desired to be taken out, the light source-replacing operation is performed at the front side of the liquid crystal display. On the other hand, when a member of the liquid crystal display disposed at its lower side is desired to be taken out, the light source-replacing operation is performed at the rear side of the liquid crystal display. That is, the construction allows an operator to select an appropriate method in dependence on a purpose and a situation.  
         [0022]     It is preferable that at least two members selected from the front frame, the sheet-holding chassis, the light source-holding member and the back chassis are fixed with fasteners penetrated therethrough in a direction from a front side of the liquid crystal display.  
         [0023]     More specifically, each of the fasteners is mounted on a member to be fixed by penetrating each of the fasteners through a through-hole formed in an unfixed member, which is disposed at a side forward from the member to be fixed.  
         [0024]     In the above-described construction, when any of the front frame, the sheet-holding chassis, the light source-holding member and the back chassis except the member disposed at the forefront are fixed to each other with the fastener that penetrates through the opening, the fastener can be removed through the opening without removing the member disposed forward from the member to be fixed. Further a disassembling operation at a maintenance time can be accomplished at only the front side of the liquid crystal display. Therefore it is unnecessary to turn the liquid crystal display upside down and possible to reduce the number of manufacturing processes.  
         [0025]     The present invention provides a liquid crystal display including a liquid crystal panel, a group of optical sheets disposed rearward from the liquid crystal panel, a light source disposed rearward from the group of optical sheets, a frame-shaped front frame disposed forward from at least the group of optical sheets, a back chassis disposed rearward from the light source and fixedly connected to the front frame directly or indirectly, and a fastener fixing at least a rearmost sheet of the group of the layered optical sheets to the front frame, and the group of the optical sheets is held in position integrally by the front frame, when the back chassis and the front frame are unfixed from each other.  
         [0026]     In the above-described construction, in maintenance of replacing the failed light source which has been exposed to the outside because the back chassis has been removed, the rearmost optical sheet remains fixed to the front frame. Therefore the construction prevents the optical sheets from being separated from each other and hence dust from entering between the optical sheets. Further the rearmost optical sheet remains fixed to the front frame. Thus the construction eliminates the need for using a member for supporting the rearmost optical sheet, thus preventing an increase in the number of component parts for the liquid crystal display. Further the construction eliminates the need for performing the light source-replacing operation in a particular environment such as a clean room. Thus the operability in the maintenance can be improved. Since the optical sheets are not separated from each other, it is unnecessary to perform an operation of assembling the optical sheets when the liquid crystal display is assembled after the light source-replacing operation is performed. Therefore it is possible to decrease the number of manufacturing processes.  
         [0027]     It is preferable that a light source-holding member holding the light source in position is equipped and that the light source-holding member is fixed to a rearmost sheet of the group of the optical sheets with a fastener.  
         [0028]     In the above-described construction, by mounting the rearmost sheet of the group of the optical sheets fixed to the front frame on the light source-holding member with the fastener, the light source-holding member can be fixed to the front frame.  
         [0029]     It is preferable that at least two members selected from the front frame, the rearmost sheet of the group of the optical sheets, the light source-holding member and the back chassis are fixed with fasteners penetrated therethrough in a direction from a front side of the liquid crystal display.  
         [0030]     More specifically, each of the fasteners is mounted on a member to be fixed by penetrating each of the fasteners through a through-hole formed in an unfixed member, which is disposed at a side forward from the member to be fixed.  
         [0031]     In the above-described construction, when any of the front frame, the rearmost sheet of the group of the optical sheets, the light source-holding member and the back chassis except the member disposed at the forefront are fixed to each other with the fastener that penetrates through the opening, the fastener can be removed through the opening without removing the member disposed forward from the member to be fixed. Further a disassembling operation at a maintenance time can be accomplished at only the front side of the liquid crystal display. Therefore it is unnecessary to turn the liquid crystal display upside down and possible to reduce the number of manufacturing processes.  
         [0032]     The present invention provides a liquid crystal display including a liquid crystal panel, a group of optical sheets disposed rearward from the liquid crystal panel, a light source disposed rearward from the group of optical sheets, a frame-shaped front frame disposed forward from at least the group of optical sheets, a back chassis disposed rearward from the light source and fixedly connected to the front frame directly or indirectly, a light source holding member holding the light source in position and supporting a periphery of a rear side of the group of optical sheets by its upper surface, and a fastener fixing the light source-holding member to the front frame, and the group of the optical sheets held in position integrally by the front frame, when the back chassis and the front frame are unfixed from each other.  
         [0033]     In the above-described construction, in maintenance of replacing the failed light source which has been exposed to the outside because the back chassis has been removed, the group of the optical sheets remain supported by the upper surface of the light source-holding member fixed to the front frame. Therefore in performing the light source-replacing operation, the construction prevents the optical sheets from being separated from each other and hence dust from entering between the optical sheets. Further since upper surface of the light source-holding member is utilized to support the optical sheets, the construction eliminates the need for additionally using a member for supporting the optical sheets, thus preventing an increase in the number of component parts for the liquid crystal display.  
         [0034]     Further the construction eliminates the need for performing the light source-replacing operation in a particular environment such as a clean room. Thus the operability in the maintenance can be improved. Since the optical sheets are not separated from each other, it is unnecessary to perform an operation of mounting the optical sheets in position when the liquid crystal display is assembled. Therefore it is possible to decrease the number of manufacturing processes.  
         [0035]     It is preferable that at least two members selected from the front frame, the light source-holding member and the back chassis are fixed with fasteners penetrated therethrough in a direction from a front side of the liquid crystal display.  
         [0036]     More specifically, each of the fasteners is mounted on a member to be fixed by penetrating each of the fasteners through a through-hole formed in an unfixed member, which is disposed at a side forward from the member to be fixed.  
         [0037]     In the above-described construction, when any of the front frame, the light source-holding member and the back chassis except the member disposed at the forefront are fixed to each other with the fastener that penetrates through the opening, the fastener can be removed through the opening without removing the member disposed forward from the member to be fixed. Further a disassembling operation at a maintenance time can be accomplished at only the front side of the liquid crystal display. Therefore it is unnecessary to turn the liquid crystal display upside down and possible to reduce the number of manufacturing processes.  
         [0038]     It is preferable that the front frame has a frame-shaped bezel holding a periphery of a front side of the liquid crystal panel or/and a frame-shaped front chassis holding a periphery of a rear side of the liquid crystal panel.  
         [0039]     The above-described construction allows the periphery of the liquid crystal panel to be sandwiched between the frame-shaped bezel and the frame-shaped front chassis constituting the front frame in combination with the bezel. A spacer interposed between the liquid crystal panel and the bezel as well as the front chassis is capable of preventing the glass substrate of the liquid crystal panel interfering with the bezel and with the front chassis. Thereby it is possible to prevent the generation of an abnormal sound. When the liquid crystal display having this construction is used for audiovisual apparatuses generating a sound, this construction is very effective for preventing an interference sound from being generated by sound wave-caused vibrations.  
         [0040]     It is preferable that the light source is composed of a plurality of linear light sources arranged in parallel; light source insertion portions are formed by cutting out a lower end of the light source-holding member; the linear light sources are positioned at the light source insertion portions respectively; and an opening formed at a lower end of each of the light source insertion portions is closed with the back chassis.  
         [0041]     In the above-described construction, a surface light source is constructed by arranging a plurality of linear light sources (for example, cold cathode-ray tube, hot cathode-ray tube, xenon lamp, and the like) at the rear side thereof, and the linear light sources can be placed in position in parallel by means of the light source-holding member. The linear light sources can be easily removed from the light source-holding member by merely sliding both end portions of the linear light sources downward from the openings formed at the lower end of the light source insertion portion of the light source-holding member after the back chassis is removed from the liquid crystal display.  
         [0042]     When the cold cathode-ray tube containing mercury is used as the linear light source, it is preferable to adopt a construction allowing efficient light source-replacing operation to be accomplished. Thereby it is possible to perform the light source-replacing operation safely without breaking the cold cathode-ray tube and completely recover the mercury that is a harmful substance from the unnecessary cold cathode-ray tube removed from the liquid crystal display. That is, the above-described construction is capable of contributing to recycling in consideration of the protection of environment.  
         [0043]     It is preferable that the light source-holding member has a rear receiving member having a groove where an end portion of each of linear light sources is mounted and a front hold-down member mounted on the rear receiving member at a front side thereof.  
         [0044]     In the above-described construction, the front hold-down member is fixedly placed on the rear receiving member with the end portion of the linear light source disposed on the groove of the rear receiving member. Thereby the linear light source is held by the light source-holding member. Consequently the assembling operation can be performed with a high handleability. In performing the light source-replacing operation, after the light source-holding member is disassembled from the front frame, the front hold-down member is taken out upward. Thereby the linear light source disposed on the groove can be taken out to the front side of the liquid crystal display. Consequently the light source-replacing operation can be accomplished at the front side of the liquid crystal display without turning the liquid crystal display upside down in the disassembling operation.  
         [0045]     It is preferable that the front hold-down member is fixed to the front frame with a fastener; and the rear receiving member is fixed to the back chassis.  
         [0046]     In the above-described construction, by merely removing the front hold-down member from the rear receiving member after the fastener is removed to disassemble the front hold-down member from the front frame, the construction allows the light source-replacing operation to be accomplished.  
         [0047]     It is preferable that the front hold-down member has a locking portion; the rear receiving member has a to-be-locked portion. In this construction, the front hold-down member is fixed to the rear receiving member by locking the to-be-locked portion to the locking portion.  
         [0048]     In the above-described construction, the front hold-down member is locked to the rear receiving member. Unlike the construction in which the front hold-down member is fixed to the rear receiving member with a screw, this construction allows a fixing operation and a removing operation to be performed by one touch. Thus this construction improves operability.  
         [0049]     It is preferable that each of the back chassis and the light source-holding member is provided with a positioning means for placing the light source-holding member and the back chassis in position.  
         [0050]     In the above-described construction, the light source-holding member can be easily mounted on the back chassis at a predetermined position thereof. Therefore the construction improves a high operability.  
         [0051]     More specifically, it is preferable that the positioning means has a convex portion formed on a lower surface of the light source-holding member and a concave portion or a fit-in hole formed on the back chassis at a position corresponding to a position of the convex portion. It is also preferable that the positioning means has a concave portion formed on the lower surface of the light source-holding member and a convex portion formed on the back chassis at the position corresponding to the position of the convex portion.  
         [0052]     In this construction, the convex portion and the concave portion are engaged each other to place the back chassis and the light source-holding member in position.  
         [0053]     That is, it is possible to place the light source-holding member and the back chassis in position by locking the light source-holding member and the back chassis to each other by means of the convex portion and the concave portion. Thus the light source-holding member and the back chassis can be placed in position by one touch in a simple construction.  
         [0054]     It is preferable that sheets constituting the group of optical sheets include a diffusing plate, a prism sheet, a diffusing sheet, an ITO sheet, PET sheet, a light-reflecting sheet.  
         [0055]     It is preferable that the light source-holding member and the back chassis are fixed to each other with a fastener mounted thereon in a direction from a rear side thereof.  
         [0056]     In the above-described construction, when the liquid crystal display is so constructed that the light source-replacing operation can be performed easily at the rear side thereof, by merely removing the fastener at the rear side of the back chassis, it is possible to separate the back chassis from the light source-holding member and expose the light source held by the light source-holding member to the outside. Therefore the operability in the maintenance can be improved.  
         [0057]     As apparent from the foregoing description, the liquid crystal display according to the present invention is so constructed that the group of the optical sheets is supported by the sheet-holding chassis; the group of the optical sheets is fixed to the front frame; or the group of the optical sheets is supported by the upper surface of the light source-holding member even when the back chassis is removed. Thus in the maintenance of replacing the light source which has been exposed to the outside because the back chassis has been removed, the group of the optical sheets remains held integrally. Therefore in the light source-replacing operation, it is possible to prevent the optical sheets from being separated from each other and hence dust from entering between the optical sheets. Further the construction eliminates the need for performing the light source-replacing operation in a particular environment such as a clean room. Thus the operability in the maintenance can be improved. Since the optical sheets are not separated from each other, it is unnecessary to perform an operation of assembling the optical sheets when the liquid crystal display is assembled from the constituting members. Therefore it is possible to decrease the number of manufacturing processes. When the cold cathode-ray tube is used as the linear light source, it is possible to take out mercury therefrom safely and securely, thus contributing to recycling in consideration of the protection of environment.  
         [0058]     Further according to the liquid crystal display of the present invention, the cost of transportation is not required and only a failed light source is replaced. Thus a short period of time is required for the light source-replacing operation and hence labor is cheap. Consequently the light source-replacing operation can be performed at a low cost. Furthermore the light source-replacing operation can be accomplished easily because it is necessary to remove only several screws. By merely replacing the failed light source in a simple operation, the liquid crystal display (for example, liquid crystal TV) to which a user has become attached can be restored to be as functional as that of a new one. As such, the user can be satisfied with the liquid crystal display. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0059]      FIG. 1  is a perspective view showing a disassembled liquid crystal display of a first embodiment of the present invention.  
         [0060]      FIG. 2A  is a sectional view showing main parts of the liquid crystal display of the first embodiment.  
         [0061]      FIG. 2B  is a sectional view showing the disassembled liquid crystal display of the first embodiment when a light source-replacing operation is performed.  
         [0062]      FIG. 3A  is a sectional view showing main parts of a liquid crystal display of a second embodiment.  
         [0063]      FIG. 3B  is a sectional view showing the disassembled liquid crystal display of the second embodiment when a light source-replacing operation is performed.  
         [0064]      FIG. 4A  is a sectional view showing main parts of a liquid crystal display of a third embodiment.  
         [0065]      FIG. 4B  is a sectional view showing the disassembled liquid crystal display of the third embodiment when a light source-replacing operation is performed.  
         [0066]      FIG. 5A  is a sectional view showing main parts of a liquid crystal display of a fourth embodiment.  
         [0067]      FIG. 5B  is a sectional view showing the disassembled liquid crystal display of the fourth embodiment when a light source-replacing operation is performed.  
         [0068]      FIG. 6A  is a sectional view showing main parts of a liquid crystal display of a fifth embodiment.  
         [0069]      FIG. 6B  is a sectional view showing the disassembled liquid crystal display of the fifth embodiment when a light source-replacing operation is performed.  
         [0070]      FIG. 7A  is a sectional view showing main parts of a liquid crystal display of a sixth embodiment.  
         [0071]      FIG. 7B  is a sectional view showing the disassembled liquid crystal display of the sixth embodiment when a light source-replacing operation is performed.  
         [0072]      FIG. 8A  is a sectional view showing main parts of a liquid crystal display of a seventh embodiment.  
         [0073]      FIG. 8B  is a sectional view showing the disassembled liquid crystal display of the seventh embodiment when a light source-replacing operation is performed.  
         [0074]      FIG. 9A  is a sectional view showing main parts of a liquid crystal display of an eighth embodiment.  
         [0075]      FIG. 9B  is a sectional view showing the disassembled liquid crystal display of the eighth embodiment when a light source-replacing operation is performed.  
         [0076]      FIG. 10A  is a sectional view showing main parts of a liquid crystal display of a ninth embodiment.  
         [0077]      FIG. 10B  is a sectional view showing the disassembled liquid crystal display of the ninth embodiment when a light source-replacing operation is performed.  
         [0078]      FIG. 11A  is a sectional view showing main parts of a liquid crystal display of a tenth embodiment.  
         [0079]      FIG. 11B  is a sectional view showing the disassembled liquid crystal display of the tenth embodiment when a light source-replacing operation is performed.  
         [0080]      FIG. 12A  is a sectional view showing main parts of a liquid crystal display of an eleventh embodiment.  
         [0081]      FIG. 12B  is a sectional view showing the disassembled liquid crystal display of the eleventh embodiment when a light source-replacing operation is performed.  
         [0082]      FIG. 13A  is a sectional view showing main parts of a liquid crystal display of a twelfth embodiment.  
         [0083]      FIG. 13B  is a sectional view showing the disassembled liquid crystal display of the twelfth embodiment when a light source-replacing operation is performed.  
         [0084]      FIG. 14A  is a sectional view showing main parts of a liquid crystal display of a thirteenth embodiment.  
         [0085]      FIG. 14B  is a sectional view showing the disassembled liquid crystal display of the thirteenth embodiment when a light source-replacing operation is performed.  
         [0086]      FIG. 15A  is a sectional view showing main parts of a liquid crystal display of a fourteenth embodiment.  
         [0087]      FIG. 15B  is a sectional view showing the disassembled liquid crystal display of the fourteenth embodiment when a light source-replacing operation is performed.  
         [0088]      FIG. 16A  is a sectional view showing main parts of a liquid crystal display of a fifteenth embodiment.  
         [0089]      FIG. 16B  is a sectional view showing the disassembled liquid crystal display of the fifteenth embodiment when a light source-replacing operation is performed.  
         [0090]      FIG. 17A  is a sectional view showing main parts of a liquid crystal display of a sixteenth embodiment.  
         [0091]      FIG. 17B  is a sectional view showing the disassembled liquid crystal display of the sixteenth embodiment when a light source-replacing operation is performed.  
         [0092]      FIG. 18A  is a sectional view showing main parts of a liquid crystal display of a seventeenth embodiment.  
         [0093]      FIG. 18B  is a sectional view showing the disassembled liquid crystal display of the seventeenth embodiment when a light source-replacing operation is performed.  
         [0094]      FIG. 19A  is a sectional view showing main parts of a liquid crystal display of an eighteenth embodiment.  
         [0095]      FIG. 19B  is a sectional view showing the disassembled liquid crystal display of the eighteenth embodiment when a light source-replacing operation is performed.  
         [0096]      FIG. 20A  is a sectional view showing main parts of a liquid crystal display of a nineteenth embodiment.  
         [0097]      FIG. 20B  is a sectional view showing the disassembled liquid crystal display of the nineteenth embodiment when a light source-replacing operation is performed.  
         [0098]      FIG. 21A  is a sectional view showing main parts of a liquid crystal display of a 20th embodiment.  
         [0099]      FIG. 21B  is a sectional view showing the disassembled liquid crystal display of the 20th embodiment when a light source-replacing operation is performed.  
         [0100]      FIG. 22A  is a sectional view showing main parts of a liquid crystal display of a 21st embodiment.  
         [0101]      FIG. 22B  is a sectional view showing the disassembled liquid crystal display of the 21st embodiment when a light source-replacing operation is performed.  
         [0102]      FIG. 23A  is a sectional view showing main parts of a liquid crystal display of a 22nd embodiment.  
         [0103]      FIG. 23B  is a sectional view showing the disassembled liquid crystal display of the 22nd embodiment when a light source-replacing operation is performed.  
         [0104]      FIG. 24A  is a sectional view showing main parts of a liquid crystal display of a 23rd embodiment.  
         [0105]      FIG. 24B  is a sectional view showing the disassembled liquid crystal display of the 23rd embodiment when a light source-replacing operation is performed.  
         [0106]      FIG. 25A  is a sectional view showing main parts of a liquid crystal display of a 24th embodiment.  
         [0107]      FIG. 25B  is a sectional view showing the disassembled liquid crystal display of the 24th embodiment when a light source-replacing operation is performed.  
         [0108]      FIG. 26A  is a sectional view showing the longer side of a liquid crystal display of a 24th embodiment.  
         [0109]      FIG. 26B  is a sectional view showing the disassembled liquid crystal display of the 24th embodiment when a light source-replacing operation is performed.  
         [0110]      FIG. 27A  is a sectional view showing main parts of a liquid crystal display of a 25th embodiment.  
         [0111]      FIG. 27B  is a sectional view showing the disassembled liquid crystal display of the 25th embodiment when a light source-replacing operation is performed.  
         [0112]      FIG. 28A  is a sectional view showing main parts of a liquid crystal display of a 26th embodiment.  
         [0113]      FIG. 28B  is a sectional view showing the disassembled liquid crystal display of the 26th embodiment when a light source-replacing operation is performed.  
         [0114]      FIG. 29A  is a sectional view showing main parts of a liquid crystal display of a 27th embodiment.  
         [0115]      FIG. 29B  is a sectional view showing the disassembled liquid crystal display of the 27th embodiment when a light source-replacing operation is performed.  
         [0116]      FIG. 30A  is a sectional view showing main parts of a liquid crystal display of a 28th embodiment.  
         [0117]      FIG. 30B  is a sectional view showing the disassembled liquid crystal display of the 28th embodiment when a light source-replacing operation is performed.  
         [0118]      FIG. 31A  is a sectional view showing main parts of a liquid crystal display of a 29th embodiment.  
         [0119]      FIG. 31B  is a sectional view showing the disassembled liquid crystal display of the 29th embodiment when a light source-replacing operation is performed.  
         [0120]      FIG. 32  shows a conventional art.  
         [0121]      FIG. 33  shows another conventional art. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0122]     The first embodiment of the present invention will be described below with reference to drawings.  
         [0123]     As shown in  FIGS. 1 and 2 A, in a liquid crystal display  20 , the periphery of a liquid crystal panel  22  is held by a frame-shaped front chassis  23  and a bezel  21  through spacers  35 ,  36 . The front chassis  23  and the bezel  21  form a front frame. A optical sheet group  32  (hereinafter referred to as optical sheet group  32 ) is disposed below the liquid crystal panel  22  by supporting the optical sheet group  32  with a frame-shaped sheet-holding chassis  27 . A plurality of linear light sources  28  is disposed parallel with each other below the optical sheet group  32 . With both ends  28   a  of each linear light source  28  being held with a light source-holding member  29 , the linear light sources  28  are closed with a reflecting composite member  30  disposed below the light source-holding member  29  and a back chassis  31  disposed below the reflecting composite member  30 . It is to be noted that the front side of the liquid crystal display at which images are displayed is set as the upper side thereof and that the rear side thereof is set as the lower side thereof.  
         [0124]     As shown in  FIG. 2A , in the liquid crystal panel  22 , liquid crystal is enclosed between transparent substrates  37  confronting each other to form a large number of pixels arranged in the shape of a matrix. Polarizing plates  38  and  39  for making the direction of planes of polarization of light beams incident on the liquid crystal panel  22  and leaving it uniform are provided at either side of the transparent substrates  37 .  
         [0125]     The optical sheet group  32  are resin sheets for diffusing and condensing transmitted light. The optical sheet group  32  includes a prism sheet  24  disposed uppermost, a diffusing sheet  25  located at an intermediate position, and a diffusing plate  26  disposed lowermost. The number of the optical sheets and the combination thereof are arbitrarily set. For example, a DBEF-D, a prism sheet, a diffusing sheet, and a diffusing plate can be layered one upon another, with the DBEF-D disposed uppermost, the prism sheet disposed under the DBEF-D, the diffusing sheet under the prism sheet, and the diffusing plate disposed lowermost. The optical sheet group  32  may include an ITO sheet, PET sheet, a light-guiding plate, and a selective reflecting sheet.  
         [0126]     The frame-shaped sheet-holding chassis  27  sectionally L-shaped includes a flat portion  27   a  supporting the peripheral edge of the lower surface of the diffusing plate  26  disposed lowermost in the optical sheet group  32  and a vertical portion  27   b  projecting vertically upward from the periphery of the flat portion  27   a . A screw hole  27   c  and a through-hole  27   d  are formed at the flat portion  27   a.    
         [0127]     A cold cathode-ray tube is used as the linear light source  28  in the first embodiment. But a hot cathode-ray tube, a xenon lamp, and a nonlinear light emitting diode (LED) may be used as the linear light source  28 . A rubber holder is mounted on the linear light source  28  at both ends thereof, although the rubber holder is not shown in the drawings. In the first embodiment, in using the liquid crystal display  20  by setting the shorter side of the liquid crystal display  20  vertically and the longer side thereof horizontally, the linear light source  28  is set horizontally to prevent mercury accommodated therein from staying at only one side. Thereby it is possible to optimize the characteristic of the light source. However, the linear light source  28  may be vertically disposed according to the performance thereof. This construction allows the linear light source disposed vertically to be shorter than the linear light source disposed horizontally.  
         [0128]     A pair of the light source-holding members  29  is a molded product made of resin and holds both ends  28   a  of a plurality of linear light sources  28  in position. Light source insertion portions  29   a  are formed by cutting out the lower ends of the opposed surfaces of a pair of the light source-holding members  29  at predetermined intervals. The light source-holding members  29  has a cut-out portion  29   b , formed at the lower end thereof, for placing the end portion of the reflecting composite member  30  in position. The light source-holding member  29  has a concave portion  29   c , formed on the lower surface thereof, which is used to position the light source-holding member  29  on the back chassis  31 . The light source-holding member  29  has an insertion hole  29   e  formed in the range from the concave portion  29   c  to the upper surface thereof. The light source-holding member  29  has a projected portion  29   g , formed on the upper surface thereof, which contacts the lower surface of the front chassis  23 . The light source-holding member  29  has another concave portion  29   d  formed on the upper surface thereof by forming a gap between a screw B 1  and the circumference of the concave portion  29   d  to prevent the light source-holding member  29  and the screw B 1  from interfering with each other.  
         [0129]     “Alset” (produced by Mitsubishi Jushi Inc.) having a reflectivity of not less than 90% is used as the reflecting composite member  30 . The “Alset” is formed by bonding a reflecting sheet  34  to the upper surface of a metal plate  33  made of aluminum.  
         [0130]     The back chassis  31  made of metal plays the role of improving the strength of the liquid crystal display and releasing heat. The back chassis  31  has a convex portion  31   a  formed at a position corresponding to the position of the concave portion  29   c  formed on the lower surface of the light source-holding member  29  to place the back chassis  31  in position. A screw hole  31   b  is formed at the convex portion  31   a . To maintain the strength of the back chassis  31 , instead of metal, the back chassis  31  may be made of resin such as fiber reinforced resin having a rigidity.  
         [0131]     It is possible to use an integral composite member having the function of the reflecting composite member  30  and the back chassis  31 . Thereby when the linear light source  28  is replaced at the rear side of the liquid crystal display, an operation of replacing the linear light source  28  can be accomplished by disassembling only several fasteners and the composite member because the composite member is integral and is hence not separated.  
         [0132]     The bezel  21  is frame-shaped and has a sectional shape of an inverted L. The bezel  21  has an opening  21   a  into which a screw B 2  is inserted and a screw hole  21   b  formed on the upper surface thereof. The front chassis  23  is frame-shaped and has a sectional shape of an inverted L. The front chassis  23  has screw holes  23   a ,  23   b , and  23   c  formed on the upper surface thereof. Screws B 1 , B 2 , and B 3  are inserted into the screw holes  23   a ,  23   b , and  23   c  respectively.  
         [0133]     The front chassis  23  and the sheet-holding chassis  27  are fixed to each other, with the optical sheet group  32  interposed therebetween by the screw B 1  threaded downward into the screw holes  23   a  and  27   c . The concave portion  29   d  is formed at the position of the light source-holding member  29  at which the screw B 1  and the light source-holding member  29  interfere with each other. Thereby it is possible to prevent the screw B 1  and the light source-holding member  29  from interfering with each other.  
         [0134]     The bezel  21  and the front chassis  23  are fixed to each other with the screw B 3  threaded downward into the screw holes  21   b  and  23   c , with the liquid crystal panel  22  sandwiched therebetween.  
         [0135]     The front chassis  23 , the light source-holding member  29 , and the back chassis  31  are fixed to each other with the screw B 2  penetrated through a through-hole  27   d  of the sheet-holding chassis  27  and threaded downward into the screw holes  23   b  and  31   b  and an insertion hole  29   e.    
         [0136]     The back chassis  31  may be fixed to an unshown position of the front chassis  23  and the bezel  21  without using the screw B 2 .  
         [0137]     The procedure of maintenance to be performed when the linear light source  28  has failed is described below.  
         [0138]     As shown in  FIG. 2B , the back chassis  31 , the reflecting composite member  30 , and the light source-holding member  29  can be disassembled by removing the screw B 2  at the front side (upper side in  FIG. 2B ) of the liquid crystal display  20  through the opening  21   a . Thereby the linear light source  28  can be taken out downward from an opening formed below the light source insertion portion  29   a  of the light source-holding member  29 . At this time, the sheet-holding chassis  27  remains fixed to the front chassis  23  with the screw B 1 . Therefore the optical sheet group  32  remains supported by the sheet-holding chassis  27 . Consequently the above-described sheets  24 ,  25 , and  26  of the optical sheet group  32  can be prevented from being separated from each other. Thus it is possible to prevent dust from entering between the sheets  24  and  25  and between the sheets  25  and  26 .  
         [0139]     The maintenance operation can be finished by merely performing an operation of positioning the concave portion  29   c  on the convex portion  31   a  of the back chassis  31 , assembling the light source-holding member  29 , the reflecting composite member  30 , and the back chassis  31  on each other, and fixing them to each other with the screw B 2 . That is, the linear light source  28  can be replaced by performing a light source-replacing operation at the front side of the liquid crystal display without taking a trouble of turning the liquid crystal display upside down. Because all the screws B 1  through B 3  are mounted in the direction from the front side of the liquid crystal display, other disassembling operations can be performed at only the front side thereof. Thus a high operability can be obtained in the first embodiment.  
         [0140]      FIGS. 3A and 3B  show the second embodiment.  
         [0141]     In the second embodiment, instead of the reflecting composite member  30 , a reflecting sheet  42  is mounted on the upper surface of the back chassis  31 . A bezel  41  has an opening  41   c , formed above the screw B 1 , into which a screw is threaded.  
         [0142]     The bezel  41  has openings  41   a  and  41   c  formed at a position corresponding to the position of the screw B 1  and at a position corresponding to the position of the screw B 2 . The bezel  41  has a screw hole  41   b  at a position corresponding to the position of the screw B 3 .  
         [0143]     In the above-described construction, when the sheet-holding chassis  27  is intended to be disassembled, the screw B 2  is removed through the opening  41   a  of the bezel  41  to disassemble the light source-holding member  29 , the reflecting sheet  42 , and the back chassis  31  from each other. The screw B 1  is also removed through the opening  41   c  of the bezel  41  to disassemble the sheet-holding chassis  27  without disassembling the bezel  41  and the front chassis  23 . Therefore it is possible to maintain the fixed state of the liquid crystal panel  22  and hence maintenance can be accomplished with high operability.  
         [0144]     That is, because all the screws B 1  through B 3  are mounted in the direction from the front side of the liquid crystal display, the disassembling operation can be performed at only the front side thereof. Thus a high operability can be obtained in the second embodiment. The other constructions are similar to those of the first embodiment. Thus they are denoted by the same reference numerals as those of the first embodiment and description thereof is omitted herein.  
         [0145]      FIGS. 4A and 4B  show the third embodiment.  
         [0146]     In the third embodiment, the liquid crystal display is not provided with the sheet-holding chassis  27 . Instead, one end of a diffusing plate  44  disposed lowermost in an optical sheet group  45  is extended sideways to provide screw holes  44   a  and  44   b  on the diffusing plate  44 .  
         [0147]     The front chassis  43  has a concave portion  43   b  formed at a position into which the screw B 1  is threaded and has a screw hole  43   d  formed at the concave portion  43   b . The front chassis  43  has an opening  43   a  formed at a position corresponding to the position of the screw B 2  and has a screw hole  44   c  formed at a position corresponding to the position of the screw B 3 .  
         [0148]     The front chassis  43  and the diffusing plate  44  disposed lowermost in the optical sheet group  45  are fixed to each other with the screw B 1  threaded into the screw hole  43   d  and the screw hole  44   b . Thereby in addition to the fixing of the diffusing plate  44  to the front chassis  43 , the prism sheet  24  and the diffusing sheet  25  disposed above the diffusing plate  44  are supported.  
         [0149]     A concave portion  43   b  is formed on the front chassis  43  to form a space in which the prism sheet  24  and the diffusing sheet  25  are layered on each other. The diffusing plate  44 , the light source-holding member  29 , and the back chassis  31  are fixed to each other with the screw B 2  threaded into the screw hole  44   a , an insertion hole  29   e , and a screw hole  31   b.    
         [0150]     In the above-described construction, when the back chassis  31 , the reflecting composite member  30 , and the light source-holding member  29  are disassembled by removing the screw B 2 , the diffusing plate  44  disposed lowermost in the optical sheet group  45  is fixed to the front chassis  43  with the screw B 1 . Thus the prism sheet  24  and diffusing sheet  25  disposed above the diffusing plate  44  remain supported thereby. Consequently the above-described sheets  24 ,  25 , and  44  of the optical sheet group  45  can be prevented from being separated from each other. Thus it is possible to prevent dust from entering between the prism sheet  24  and the diffusing sheet  25  and between the diffusing sheet  25  and the diffusing plate  44 .  
         [0151]     All the screws B 1  through B 3  are mounted in the direction from the front side of the liquid crystal display. Thus it is possible to accomplish the operation of replacing the linear light source  28  at the front side of the liquid crystal display without taking a trouble of turning the liquid crystal display upside down. Thus a high operability can be obtained in the third embodiment.  
         [0152]     Instead of forming the screw holes  44   a  and  44   b  on the diffusing plate  44 , a nut may be mounted on the diffusing plate  44  by insert molding. The screw B 1  may be used to fix the prism sheet  24  and the diffusing sheet  25  disposed above the diffusing plate  44 , although the screw B 1  is used to fix the diffusing plate  44  disposed lowermost in the optical sheet group  45  to the front chassis  43  in the third embodiment. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0153]      FIGS. 5A and 5B  show the fourth embodiment.  
         [0154]     In the fourth embodiment, the screw B 2  for fixing a front chassis  48  and a light source-holding member  50  to each other is horizontally threaded into screw holes formed on the side surface thereof. The back chassis  31  is fixed to the light source-holding member  50  with a screw B 4  threaded upward into screw holes formed on the rear surfaces thereof.  
         [0155]     The bezel  47  has a screw hole  47   a  formed on its upper surface and a screw insertion opening  47   b  formed on its side surface.  
         [0156]     A front chassis  48  has screw holes  48   a  and  48   b , formed on its upper surface, into which the screws B 1  and B 3  are threaded respectively and has a screw hole  48   c , formed on its side surface, into which the screw B 2  is threaded.  
         [0157]     The lower end of the opposed surfaces of a pair of the light source-holding members  50  is cut out to form light source insertion portions  50   a . The light source-holding member  50  has a concave portion  50   c , formed on its lower surface, for positioning the light source-holding member  50  on the back chassis  31 . A screw hole  50   h  is formed through the concave portion  50   c . A cut-out portion  50   b  for positioning an end portion of the reflecting composite member  30  is formed on the lower end of the light source insertion portion  50   a . The light source-holding member  50  has a concave portion  50   d  formed on its upper surface by forming a gap between the circumference of the concave portion  50   d  and the screw B 1  to prevent the screw B and the light source-holding member  50  from interfering with each other. The light source-holding member  50  has a screw hole  50   f , formed on its side surface, for fixing the screw B 2  thereto.  
         [0158]     The light source-holding member  50  and the back chassis  31  are fixed to each other by threading the screw B 4  upward into the screw holes  31   b  and  50   h , with the convex portion  31   a  of the back chassis  31  fitted into the concave portion  50   c  of the light source-holding member  50 .  
         [0159]     In performing the operation of replacing the linear light source  28 , the screw B 4  is removed from the rear side of the liquid crystal display. Thereby the back chassis  31  and the reflecting composite member  30  can be removed without disassembling the optical sheet group  32 . When the light source-holding member  50  is desired to be removed, the screw B 2  is removed through the opening  47   b  of the bezel  47 . Thereby with the optical sheet group  42  and the liquid crystal panel  22  kept fixed, a disassembling operation can be accomplished sideways. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0160]      FIGS. 6A and 6B  show the fifth embodiment.  
         [0161]     In the fifth embodiment, a sheet-holding chassis  54  is fixed to a bezel  52  with the screw B 3 .  
         [0162]     The bezel  52  has a screw hole  52   a , formed on its upper surface, into which the screw B 3  is threaded and has a screw insertion opening  52   b  formed on its side surface.  
         [0163]     A front chassis  53  has a screw hole  53   a , formed on its upper surface, into which the screw B 1  is threaded and has a through-hole  53   b , formed on its upper surface, through which the screw B 3  is inserted. The front chassis  53  has a screw hole  53   c , formed on its side surface, into which the screw B 2  is threaded.  
         [0164]     The sheet-holding chassis  54  has screw holes  54   a  and  54   b  into which the screws B 1  and B 3  are threaded respectively.  
         [0165]     The lower end of the opposed surfaces of a pair of the light source-holding members  55  is cut out to form light source insertion portions  55   a . The light source-holding member  55  has a concave portion  55   c , formed on its lower surface, for positioning the light source-holding member  55  on the back chassis  31 . A screw hole  55   h  is formed through the concave portion  55   c . A cut-out portion  55   b  for positioning an end portion of the reflecting composite member  30  is formed on the lower end of the light source insertion portion  55   a . The light source-holding member  55  has concave portions  55   d  and  55   i  formed on its upper surface by forming a gap between the circumference of the concave portion  55   d  and the screw B 1  and between the circumference of the concave portion  55   i  and the screw B 2  to prevent the screws B 1  and B 2  from interfering the light source-holding member  55 . The light source-holding member  55  has a screw hole  55   g , formed on its side surface, for fixing the screw B 2  thereto.  
         [0166]     In performing the operation of replacing the linear light source  28 , as in the case of the fourth embodiment, the screw B 4  is removed from the rear side of the liquid crystal display. Thereby the back chassis  31  and the reflecting composite member  30  can be removed without disassembling the optical sheet group  32  to replace the linear light source  28 . The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0167]      FIGS. 7A and 7B  show the sixth embodiment.  
         [0168]     The sheet-holding chassis  59  of the sixth embodiment has a flat portion  59   a  supporting the diffusing plate  26 , a vertical portion  59   b  projecting vertically upward from the periphery of the flat portion  59   a , a horizontal portion  59   c  projecting outward from the upper end of the vertical portion  59   b , and a descending portion  59   d  projecting downward from the periphery of the horizontal portion  59   c . The flat portion  59   a  has screw holes  59   e  and  59   f  into which the screws B 2  and B 3  are threaded respectively. The descending portion  59   d  has a screw hole  59   g  into which the screw B 1  is inserted.  
         [0169]     A bezel  57  has a screw hole  57   b , formed on its upper surface, into which the screw B 3  is threaded and has a screw insertion opening  57   a  formed on its upper surface. The bezel  57  has a screw insertion opening  57   c  formed on its side surface.  
         [0170]     A front chassis  58  has a screw hole  58   a , formed on its upper surface, into which the screw B 2  is threaded and has an opening  58   b , formed on its upper surface, through which the screw B 3  penetrates. The front chassis  58  has a screw hole  58   c , formed on its side surface, into which the screw B 1  is threaded.  
         [0171]     The lower end of the opposed surfaces of a pair of the light source-holding members  60  is cut out to form light source insertion portions  60   a . The light source-holding member  60  has a concave portion  60   c , formed on its lower surface, for positioning the light source-holding member  60  on the back chassis  31 . An insertion hole  60   e  is formed in the direction from the concave portion  60   c  to the upper surface of the light source-holding member  60 . A cut-out portion  60   b  for positioning an end portion of the reflecting sheet  42  is formed on the lower end of the light source insertion portion  60   a . The light source-holding member  60  has a concave portion  60   d  formed on its upper surface by forming a gap between the circumference of the concave portion  60   d  and the screw B 3  to prevent the screw B 3  and the light source-holding member  60  from interfering with each other.  
         [0172]     In performing the operation of replacing the linear light source  28 , the screw B 2  is removed through the opening  57   a  of the bezel  57 . Thereby without disassembling the optical sheet group  32 , the back chassis  31 , the reflecting sheet  42 , and the light source-holding member  60  can be removed by performing the replacing operation at only the front side of the liquid crystal display. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0173]      FIGS. 8A and 8B  shows the seventh embodiment.  
         [0174]     A light source-holding member  62  of the seventh embodiment is composed of a rear receiving member  63  and a front hold-down member  64  sandwiching both ends  28   a  of the linear light source  28  therebetween.  
         [0175]     The rear receiving member  63  has a concave portion  63   a , formed on its upper surface, into which the lower surface of the front hold-down member  64  is fitted. The upper end of the inner side surface of the rear receiving member  63  is cut out to form a groove  63   d  on which an end portion  28   a  of the linear light source  28  is mounted. The lower end of the inner side surface of the rear receiving member  63  is cut out to form a cut-out portion  63   e  for holding down the reflecting composite member  30 . The rear receiving member  63  has a concave portion  63   b , formed on its lower surface, for positioning the rear receiving member  63  on the back chassis  31 . An insertion hole  63   c  penetrating through the rear receiving member  63  from the concave portion  63   b  to the upper surface thereof is formed in the concave portion  63   b.    
         [0176]     The front hold-down member  64  has a convex portion  64   a , formed on its lower surface, which fits in the concave portion  63   a  of the rear receiving member  63 . The lower end of the inner side surface of the front hold-down member  64  is cut out to form a cut-out portion  64   c  which matches the groove  63   d  of the rear receiving member  63 . The front hold-down member  64  has a concave portion  64   d  formed on its upper surface by forming a gap between the circumference of the concave portion  64   d  and the screw B 1  to prevent the screw B 1  and the front hold-down member  64  from interfering with each other. The front hold-down member  64  has a screw hole  64   e , formed on its upper surface, into which the screw B 2  is threaded. The front hold-down member  64  has a projected portion  64   f  that contacts the lower surface of the front chassis  23 . The front hold-down member  64  has a screw hole  64   b  formed in the range from a stepped horizontal outer upper surface thereof to the lower surface thereof.  
         [0177]     The front hold-down member  64  is placed on the rear receiving member  63  with the end portion  28   a  of the linear light source  28  mounted on the groove  63   d  of the rear receiving member  63 . The convex portion  64   a  is fitted in the concave portion  63   a . The screw B 4  is inserted downward into the matched insertion hole  63   c  and the screw hole  64   b  and threaded into the screw hole  31   b  of the back chassis  31  to fix the rear receiving member  63  and the front hold-down member  64  to each other. The front chassis  23  and the light source-holding member  62  are fixed to each other by penetrating the screw B 2  through the through-hole  27   d  of the sheet-holding chassis  27  and by threading the screw B 2  into the screw holes  23   b  and  64   e.    
         [0178]     In the above-described construction, before the light source-holding member  62  is mounted on the front chassis  23 , the linear light source  28  is held by the light source-holding member  62  with the screw B 4 . Therefore the assembling operation can be performed with high handleability.  
         [0179]     In performing the operation of replacing the linear light source  28 , after the screw B 2  is removed, the screw B 4  is removed to take out the front hold-down member  64  upward. Thereby the linear light source  28  disposed on the groove  63   d  can be taken out to the front side of the liquid crystal display. That is, the operation of replacing the linear light source  28  can be accomplished at the front side of the liquid crystal display. Thus it is unnecessary to turn the liquid crystal display upside down and possible to reduce a load in the light source-replacing operation. Thus it is possible prevent the liquid crystal display from being damaged. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0180]      FIGS. 9A and 9B  show the eighth embodiment.  
         [0181]     Similarly to the second embodiment, the bezel  41  has an opening  41   c  formed above the screw B 1 . The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0182]      FIGS. 10A and 10B  show the ninth embodiment.  
         [0183]     Unlike the eighth embodiment, in the ninth embodiment, the sheet-holding chassis  27  is not used. But instead, similarly to the ninth embodiment, one end of the diffusing plate  44  disposed lowermost in the optical sheet group  45  is extended sideways to form the screw holes  44   a  and  44   b  on the diffusing plate  44 .  
         [0184]     The front chassis  43  and the diffusing plate  44  disposed lowermost in the optical sheet group  45  are fixed to each other with the screw B 1  threaded into the screw hole  43   d  and the screw hole  44   b . Thereby in addition to the fixing of the diffusing plate  44  to the front chassis  43 , the prism sheet  24  and the diffusing sheet  25  disposed above the diffusing plate  44  are supported.  
         [0185]     Therefore in performing the operation of replacing the linear light source  28  by removing the screws B 2  and B 4 , it is possible to prevent the prism sheet  24 , the diffusing sheet  25 , and the diffusing plate  44  of the optical sheet group  32  from being separated from each other and hence prevent dust from entering between the prism sheet  24  and the diffusing sheet  25  and between the diffusing sheet  25  and the diffusing plate  44 . Further the operation of replacing the linear light source  28  can be accomplished at only the front side of the liquid crystal display. Thus a high operability can be obtained in the ninth embodiment. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0186]      FIGS. 11A and 11B  show the tenth embodiment.  
         [0187]     Unlike the ninth embodiment, in the tenth embodiment, a front chassis  48  and a front hold-down member  67  are fixed to each other with the screw B 3  threaded into screw holes formed sideways.  
         [0188]     The front hold-down member  67  of a light source-holding member  66  has a convex portion  67   a , formed on its lower surface, which fits in the concave portion  63   a  of the rear receiving member  63 . The lower end of the inner side surface of the front hold-down member  67  is cut out to form a cut-out portion  67   c  which matches the groove  63   d  of the rear receiving member  63 . The front hold-down member  67  has a concave portion  67   d  formed on its upper surface by forming a gap between the circumference of the concave portion  67   d  and the screw B 1  to prevent the screw B 1  and the front hold-down member  67  from interfering with each other. The front hold-down member  67  has a projected portion  67   f , formed on its upper surface, which contacts the lower surface of the front chassis  23 . The front hold-down member  67  has a screw hole  67   b  formed in the range from a stepped horizontal outer upper surface thereof to the lower surface thereof. The front hold-down member  67  has a screw hole  67   e , formed on its outer side surface, into which the screw B 3  is threaded.  
         [0189]     In performing the operation of replacing the linear light source  28 , after the screw B 3  is removed sideways, the screw B 4  is removed at the front side to disassemble the front hold-down member  67  upward from the liquid crystal display. Thereby the linear light source  28  disposed on the groove  63   d  can be taken out to the front side of the liquid crystal display. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0190]      FIGS. 12A and 12B  show the eleventh embodiment.  
         [0191]     In the eleventh embodiment, the bezel  52  and the sheet-holding chassis  54  are fixed to each other with the screw B 2  threaded downward into screw holes formed on the upper surfaces thereof.  
         [0192]     The front hold-down member  70  of a light source-holding member  69  has a convex portion  70   a , formed on its lower surface, which fits in the concave portion  63   a  of the rear receiving member  63 . The lower end of the inner side surface of the front hold-down member  70  is cut out to form a cut-out portion  70   c  which matches the groove  63   d  of the rear receiving member  63 . The front hold-down member  70  has concave portions  70   d  and  70   i  formed on its upper surface by forming a gap between the circumference of the concave portion  70   d  and the screw B 1  and between the circumference of the concave portion  70   i  and the screw B 2  to prevent the screws B 1  and B 2  from interfering with the front hold-down member  70 . The front hold-down member  70  has a projected portion  70   f  formed on its upper surface, which contact the lower surface of the front chassis  23 . The front hold-down member  70  has a screw hole  70   b  formed in the range from a stepped horizontal outer upper surface thereof to the lower surface thereof. The front hold-down member  70  has a screw hole  70   e , formed on its outer side surface, into which the screw B 3  is threaded. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0193]      FIGS. 13A and 13B  show the twelfth embodiment.  
         [0194]     Unlike eleventh embodiment, the sheet-holding chassis  59  of the twelfth embodiment is similar to that of the sixth embodiment.  
         [0195]     The front hold-down member  73  of a light source-holding member  72  has a convex portion  73   a , formed on its lower surface, which fits in the rear receiving member  63 . The lower end of the inner side surface of the front hold-down member  73  is cut out to form a cut-out portion  73   c  which matches the groove  63   d  of the rear receiving member  63 . The front hold-down member  73  has a screw hole  73   d  into which the screw B 2  is threaded. The front hold-down member  73  has a concave portion  73   e  formed on its upper surface by forming a gap between the circumference of the concave portion  73   e  and the screw B 3  to prevent the screw B 2  and the front hold-down member  73  from interfering with each other. The front hold-down member  73  has a screw hole  73   b  formed in the range from a stepped horizontal outer upper surface thereof to the lower surface thereof.  
         [0196]     In performing the operation of replacing the linear light source  28 , after the screw B 2  is removed through the opening  57   c  of the bezel  57 , the screw B 4  is removed to perform a disassembling operation. Thereby the linear light source  28  can be replaced by performing the replacing operation at the front side of the liquid crystal display. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0197]      FIGS. 14A and 14B  show the thirteenth embodiment.  
         [0198]     A light source-holding member  74  of the thirteenth embodiment has a rear receiving member  75  and a front hold-down member  76 . The light source-holding member  74  is so constructed that the rear receiving member  75  and the front hold-down member  76  are removably fixed to each other.  
         [0199]     The rear receiving member  75  has a concave to-be-locked portion  75   a  sectionally L-shaped, formed on its upper surface, which is locked to the front hold-down member  76 . The upper end of the inner side surface of the rear receiving member  75  is cut out to form a groove  75   d  on which an end portion  28   a  of the linear light source  28  is mounted. The lower end of the inner side surface of the rear receiving member  75  is cut out to form a cut-out portion  75   e  for holding down the reflecting composite member  30 . The rear receiving member  75  has a concave portion  75   b , formed on its lower surface, for placing the rear receiving member  75  in position. A screw hole  75   c  is formed in penetration through the concave portion  75   b.    
         [0200]     The front hold-down member  76  has a locking portion  76   a  formed on its lower surface. The locking portion  76   a  is projected in the shape of L in section and slidably locked to the to-be-locked portion  75   a  of the rear receiving member  75 . The lower end of its inner side surface of the front hold-down member  76  is cut out to form a cut-out portion  76   c  which matches the groove  75   d . The front hold-down member  76  has a concave portion  76   d  formed on its upper surface by forming a gap between the circumference of the concave portion  76   d  and the screw B 1  to prevent the screw B 1  and the front hold-down member  76  from interfering with each other. The front hold-down member  76  has a screw hole  76   e , formed on its upper surface, into which the screw B 2  is threaded and has a projected portion  76   f , formed on its upper surface, which contacts the lower surface of the front chassis  23 .  
         [0201]     The light source-holding member  74  and the linear light source  28  are fixed to each other by slidably fitting the locking portion  76   a  of the front hold-down member  76  into the concave portion  75   a  of the rear receiving member  75  with the end  28   a  of the linear light source  28  mounted on the groove  75   d  of the rear receiving member  75  and by locking both to each other. Thereby the linear light source  28  is held by the light source-holding member  74 . Thus the assembling operation can be performed with high handleability.  
         [0202]     The rear receiving member  75  is fixed to the back chassis  31  with the screw B 4  threaded upward into the screw holes  31   b  and  75   c , with the concave portion  75   b  of the rear receiving member  75  positioned at the convex portion  31   a  of the back chassis  31 . The front chassis  23  and the front hold-down member  76  are fixed to each other with the screw B 2  penetrated through the through-hole  27   d  of the sheet-holding chassis  27  and threaded downward into the screw holes  23   b  and  76   e.    
         [0203]     In the above-described construction, to unlock the front hold-down member  76  from the to-be-locked portion  75   a , after the screw B 2  is removed, the front hold-down member  76  is moved upward while the front hold-down member  76  is being slid. Thereby the linear light source  28  disposed on the groove  75   d  can be taken out from the liquid crystal display and replaced. That is, since the front hold-down member  76  is locked to the rear receiving member  75 , it is possible to perform a fixing operation and a disassembling operation by one touch and hence improve the operability.  
         [0204]     The operation of replacing the linear light source  28  can be accomplished at only the front side of the liquid crystal display. Alternatively, it is possible to perform the light source-replacing operation at the rear side of the liquid crystal display by unlocking the rear receiving member  75  after removing the screw B 4 . That is, in dependence on an operation situation, the construction of the 13th embodiment allows an operator to perform the light source-replacing operation by selecting a direction in which the light source-replacing operation can be made easily. Thus the flexibility of the light source-replacing operation can be improved. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0205]      FIGS. 15A and 15B  show the fourteenth embodiment.  
         [0206]     Unlike the thirteenth embodiment, in the fourteenth embodiment, similarly to the second embodiment, the bezel  41  has the screw insertion opening  41   c  formed above the screw B 1 . The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0207]      FIGS. 16A and 16B  show the fifteenth embodiment.  
         [0208]     Unlike the fourteenth embodiment, in the fifteenth embodiment, the sheet-holding chassis  27  is not used. But instead similarly to the ninth embodiment, one end of the diffusing plate  44  disposed lowermost in the optical sheet group  45  is extended sideways to form the screw holes  44   a  and  44   b  on the diffusing plate  44 , similarly to the third and ninth embodiments.  
         [0209]     In the above-described construction, to unlock the front hold-down member  76  from the to-be-locked portion  75   a , after the screw B 2  is removed, the front hold-down member  76  is moved upward while the front hold-down member  76  is being slid. Thereby the linear light source  28  can be replaced. The screw B 1  maintains the fixed state of the diffusing plate  44 , the prism sheet  24  and the diffusing sheet  25  disposed above the diffusing plate  44  are supported. Thus it is possible to prevent the sheets  24 ,  25 , and  44  of the optical sheet group  45  from being separated from each other and dust from entering between the sheets  24  and  25  and between the sheets  25  and  44 . The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0210]      FIGS. 17A and 17B  show the sixteenth embodiment.  
         [0211]     Unlike the thirteenth embodiment, in the sixteenth embodiment, a front chassis  48  and a front hold-down member  78  are fixed to each other with the screw B 3  threaded into screw holes formed sideways.  
         [0212]     The front hold-down member  78  has a locking portion  78   a  formed on its lower surface. The locking portion  78   a  is projected in the shape of L in section and slidably locked to the to-be-locked portion  75   a  of the rear receiving member  75 . The lower end of the inner side surface of the front hold-down member  78  is cut out to form a cut-out portion  78   c  which matches the groove  75   d . The front hold-down member  78  has a concave portion  78   d  formed on its upper surface by forming a gap between the circumference of the concave portion  78   d  and the screw B 1  to prevent the screw B 1  and the front hold-down member  78  from interfering with each other. The front hold-down member  78  has a projected portion  78   f , formed on its upper surface, which contacts the lower surface of the front chassis  23 . The front hold-down member  78  has a screw hole  78   e , formed on its outer side surface, into which the screw B 2  is threaded.  
         [0213]     In the above-described construction, in performing the operation of replacing the linear light source  28 , after the screw B 3  is removed, the front hold-down member  78  is slid to unlock the front hold-down member  76  from the to-be-locked portion  75   a . Then the front hold-down member  76  is moved upward. Thereby the linear light source  28  disposed on the groove  75   d  can be taken out from the liquid crystal display and replaced. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0214]      FIGS. 18A and 18B  show the seventeenth embodiment.  
         [0215]     Unlike the sixteenth embodiment, in the seventeenth embodiment, similarly to the eleventh embodiment, the bezel  52  and the sheet-holding chassis  54  are fixed to each other with the screw B 2  threaded downward into screw holes formed on the upper surfaces thereof.  
         [0216]     The front hold-down member  80  has a locking portion  80   a  formed on its lower surface. The locking portion  80   a  is projected in the shape of L in section and slidably locked to the to-be-locked portion  75   a  of the rear receiving member  75 . The lower end of the inner side surface of the front hold-down member  80  is cut out to form a cut-out portion  80   c  which matches the groove  75   d . The front hold-down member  80  has concave portions  80   d  and  80   i  formed on its upper surface by forming a gap between the circumference of the concave portion  80   d  and the screw B 1  and between the circumference of the concave portion  80   i  and the screw B 2  to prevent the screws B 1  and B 2  from interfering with the front hold-down member  80 . The front hold-down member  80  has a projected portion  80   f , formed on its upper surface, which contacts the lower surface of the front chassis  53 . The front hold-down member  80  has a screw hole  80   e , formed on its outer side surface, into which the screw B 2  is threaded. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0217]      FIGS. 19A and 19B  show the eighteenth embodiment.  
         [0218]     Unlike the seventeenth embodiment, in the eighteenth embodiment, the sheet-holding chassis  59  similar to that of the sixth embodiment and the twelfth embodiment is used.  
         [0219]     The front hold-down member  82  has a locking portion  82   a  formed on its lower surface. The locking portion  82   a  is projected in the shape of L in section and slidably locked to the to-be-locked portion  75   a  of the rear receiving member  75 . The lower end of the inner side surface of the front hold-down member  82  is cut out to form a cut-out portion  82   c  which matches the groove  75   d . The front hold-down member  82  has a concave portion  82   d  formed on its upper surface by forming a gap between the circumference of the concave portion  82   d  and the screw B 2  to prevent the screw B 2  and the front hold-down member  82  from interfering with each other. The front hold-down member  82  has a screw hole  82   e , formed on its upper surface, into which the screw B 3  is threaded.  
         [0220]     In the operation of replacing the linear light source  28 , after the screw B 3  is replaced, the front hold-down member  28  is slid to unlock the front hold-down member  28  from the rear receiving member  75  and take it out upward. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0221]      FIGS. 20A and 20B  show the nineteenth embodiment.  
         [0222]     In the nineteenth embodiment, the sheet-holding chassis is not used. But instead one end of the diffusing plate  86  disposed lowermost in the optical sheet group  87  is extended sideways to fix the diffusing plate  86  and the front chassis  85  to each other. In addition, a vertical portion  86   b  formed by bending the end of the diffusing plate  86  downward is fixed to a front hold-down member  88  with the screw B 3  threaded into screw holes formed sideways.  
         [0223]     The bezel  84  has a screw hole  84   b , formed on the upper surface thereof, into which the screw B 2  is threaded and an opening  84   a , formed on the side surface thereof, into which a screw is threaded. In addition, a screw insertion opening  84   c  is formed on the side surface of the bezel  84 .  
         [0224]     The front chassis  85  has a concave portion  85   a  formed at a position of its upper surface where the screw B 1  is inserted. A screw hole  85   d  is formed in penetration through the concave portion  85   a . A screw hole  85   b  is formed at a position corresponding to the position of the screw B 2 . The front chassis  85  has an opening  85   c , formed on the side surface thereof, into which the screw B 3  is inserted.  
         [0225]     The diffusing plate  86  disposed lowermost in the optical sheet group  87  has a vertical portion  86   b  bent downward at an end of a flat portion  86   a  thereof, a screw hole  86   c , formed at a position of the flat portion  86   a , into which the screw B 1  is threaded, and a screw hole  86   d , formed on the vertical portion  86   b  thereof, into which the screw B 3  is threaded.  
         [0226]     The front hold-down member  88  has a locking portion  88   a  formed on its lower surface. The locking portion  88   a  is projected in the shape of L in section and slidably locked to the to-be-locked portion  75   a  of the rear receiving member  75 . The lower end of the inner side surface of the front hold-down member  88  is cut out to form a cut-out portion  88   c  which matches the groove  75   d . The front hold-down member  88  has a concave portion  88   d  formed on its upper surface by forming a gap between the circumference of the concave portion  88   d  and the screw B 1  to prevent the screw B 1  and the front hold-down member  88  from interfering with each other. The front hold-down member  88  has a projected portion  88   e  on its upper surface. The front hold-down member  88  has a screw hole  88   f  formed on a side surface formed by stepping the upper surface thereof outward.  
         [0227]     The diffusing plate  86  and the front hold-down member  88  are fixed to each other with the screw B 3  threaded sideways into screw holes  86   d  and  88   f . The front chassis  85  and the diffusing plate  86  are fixed to each other with the screw B 1  threaded into screw holes  85   d  and  86   c . Thereby in addition to the fixing of the diffusing plate  86  to the front chassis  43 , the prism sheet  24  and the diffusing sheet  25  disposed above the diffusing plate  44  are supported.  
         [0228]     In the above-described construction, after the screw B 3  is removed sideways, the front hold-down member  88  and the rear receiving member  75  are unlocked from each other. Thereby the linear light source  28  can be replaced without disassembling the optical sheet group  87 . The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0229]      FIGS. 21A and 21B  show the twentieth embodiment.  
         [0230]     Unlike the nineteenth embodiment, in the twentieth embodiment, a to-be-mounted portion  92  separate from the diffusing plate  90  is projectingly and downwardly mounted at an end of a diffusing plate  90  disposed lowermost in an optical sheet group  91 .  
         [0231]     The diffusing plate  90  has a screw hole  90   a , formed at a required position, into which the screw B 1  is threaded. The to-be-mounted portion  92  is fixed to the diffusing plate  90  at its one end by engagement, adhesion or weld. A screw hole  92   a  is formed sideways in penetration through the to-be-mounted portion  92 . The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0232]      FIGS. 22A and 22B  show the 21st embodiment.  
         [0233]     In the 21st embodiment, the optical sheet group  32  is supported by the upper surface  95   d  of the light source-holding member  95 . Further the light source-holding member  95  is not disassembled but the linear light source  28  can be disassembled.  
         [0234]     The lower end of the inner side surface of the light source-holding member  95  is cut out to form light source insertion portions  95   a . A cut-out portion  95   b  for positioning an end of the reflecting composite member  30  is formed at the lower end of the light source-holding member  95 . A concave portion  95   c  for positioning the light source-holding member  95  on the back chassis  31  is formed on the lower surface of the light source-holding member  95 . A screw hole  95   g  into which the screw B 4  is threaded is formed in penetration through the concave portion  95   c . The upper surface  95   d  of the light source-holding member  95  is located at a position where the periphery of the lower surface of the diffusing plate  26  disposed lowermost in the optical sheet group  32  can be supported. A projected portion  95   e  which contacts the lower surface of the front chassis  94  is formed at a required position of the upper surface  95   d  of the light source-holding member  95 . A screw hole  95   f  into which the screw B 1  is threaded is also formed at a required position of the upper surface  95   d  of the light source-holding member  95 .  
         [0235]     The front chassis  94  has screw holes  94   a  and  94   b , formed in penetration through its upper surface, into which the screws B 1  and B 3  are threaded respectively.  
         [0236]     In performing the operation of replacing the linear light source  28 , the screw B 4  is removed at the rear side of the liquid crystal display to disassemble the back chassis  0 . 31  and the reflecting composite member  30 . Thereby the operation of replacing the linear light source  28  can be accomplished without disassembling the optical sheet group  32 . The linear light source  28  can be replaced by performing an operation at only the rear side of the liquid crystal display. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0237]      FIGS. 23A and 23B  show the 22nd embodiment.  
         [0238]     In the 22nd embodiment, the diffusing plate  44  disposed lowermost in the optical sheet group  45  is fixed to the front chassis  43  with the screw B 1  and to the light source-holding member  97  with the screw B 2 . The back chassis  31  and the light source-holding member  97  are fixed to each other with the screw B 4  threaded upward into screw holes formed on the rear surface thereof.  
         [0239]     The lower end of the inner side surface of the light source-holding member  97  is cut out to form light source insertion portions  97   a . A cut-out portion  97   b  for positioning an end of the reflecting composite member  30  is formed at the lower end of the light source-holding member  97 . A concave portion  97   c  for positioning cut-out portion  97   b  on the back chassis  31  is formed on the lower surface of the light source-holding member  97 . A screw hole  97   g  into which the screw B 4  is threaded is formed in penetration through the concave portion  97   c . A projected portion  97   e  that contacts the lower surface of the front chassis  43  is formed on the upper surface of the light source-holding member  97 . The light source-holding member  97  has a concave portion  97   d , formed on its upper surface, which is a vacant space for preventing the light source-holding member  97  from interfering with the screw B 1 . A screw hole  97   f  into which the screw B 1  is threaded is also formed on the upper surface  97   d  of the light source-holding member  97 .  
         [0240]     In performing the operation of replacing the linear light source  28 , the screw B 4  is removed at the rear side of the liquid crystal display with the optical sheet group  45  being supported. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0241]      FIGS. 24A and 24B  show the 23rd embodiment.  
         [0242]     Unlike the 21st embodiment, in the 23rd embodiment, the screw B 1  for fixing a front chassis  99  and a light source-holding member  100  to each other is threaded into screw holes formed sideways.  
         [0243]     The front chassis  99  has a screw hole  99   a , formed on its upper surface, into which the screw B 2  is threaded and has a screw hole  99   b , formed on its side surface, into which the screw B 1  is threaded.  
         [0244]     The lower end of the inner side surface of the light source-holding member  100  is cut out to form light source insertion portions  100   a . A cut-out portion  100   b  for positioning an end of the reflecting composite member  30  is formed at the lower end of the light source-holding member  100 . A concave portion  100   c  for positioning the light source-holding member  100  on the back chassis  31  is formed on the lower surface of the light source-holding member  100 . A screw hole  100   g  into which the screw B 4  is threaded is formed in penetration through the concave portion  100   c . The upper surface  100   d  of the light source-holding member  100  is located at a position where the periphery of the lower surface of the diffusing plate  26  disposed lowermost in the optical sheet group  32  can be supported. A projected portion  100   e  which contacts the lower surface of the front chassis  99  is formed at a required position of the upper surface  100   d  of the light source-holding member  100 . A screw hole  100   f  into which the screw B 1  is threaded is formed on the outer side surface of the light source-holding member  100 .  
         [0245]     In performing the operation of replacing the linear light source  28 , the screw B 4  is removed at the rear side of the liquid crystal display to disassemble the back chassis  31  and the reflecting composite member  30 . Thereby the operation of replacing the linear light source  28  can be accomplished without disassembling the optical sheet group  32 . The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0246]      FIGS. 25 and 26  show the 24th embodiment.  
         [0247]     Unlike the first embodiment, in the 24th embodiment, a back chassis  103 , a reflecting composite member  104 , and the front chassis  23  are fixed to each other with a screw B 5  threaded downward into screw holes formed at the longer side thereof.  
         [0248]     The lower end of the inner side surface of a light source-holding member  102  is cut out to form light source insertion portions  102   a . A cut-out portion  102   b  for positioning an end of the reflecting composite member  104  is formed at the lower end of the light source-holding member  102 . A convex portion  102   c  for positioning the light source-holding member  102  on the back chassis  103  is formed on the lower surface of the light source-holding member  102 . A projected portion  102   e  that contacts the lower surface of the front chassis  23  is formed on the upper surface of the light source-holding member  102 . The light source-holding member  102  has a concave portion  102   d  formed on its upper surface by forming a gap between the circumference of the concave portion  102   d  and the screw B 1  to prevent the screw B 1  and the light source-holding member  102  from interfering with each other. A screw hole  102   e  into which the screw B 2  is threaded is also formed on the upper surface of the light source-holding member  102 .  
         [0249]     “Alset” (produced by Mitsubishi Jushi Inc.), having a reflectivity of not less than 90%, which is formed by bonding a reflecting sheet  106  to the upper surface of a metal plate  105  made of aluminum is used as the reflecting composite member  104 . The reflecting composite member  104  has a bottom surface portion  104   a , a side surface portion  104   b  inclining from an end of the bottom surface portion  104   a  and projecting upward, and a flange portion  104   c  projecting sideways from the upper end of the side surface portion  104   b . A screw hole  104   d  is formed in penetration through the flange portion  104   c.    
         [0250]     As shown in  FIG. 26A  which is a sectional view showing the longer side of the back chassis  103 , the back chassis  103  has a bottom surface portion  103   a , a side surface portion  103   b  inclining from an end of the back chassis  103   a  and projecting upward, and a flange portion  103   c  projecting sideways from the upper end of the side surface portion  104   b . A screw hole  103   e  is formed in penetration through the flange portion  104   c . As shown in  FIG. 25A  which is a sectional view showing the shorter side of the back chassis  103 , a fit-in hole  103   d  is formed at a position corresponding to the position of a convex portion  102   c  formed on the lower surface of the light source-holding member  102 .  
         [0251]     In performing the operation of replacing the linear light source  28 , as shown in  FIGS. 25B and 26B , the screw B 5  is removed upward to remove the back chassis  103  and the reflecting composite member  104  upward without disassembling the sheet-holding chassis  27 . In this manner, the linear light source  28  can be replaced. Since all the screws B 1 , B 2 , B 3 , and B 5  are threaded into the screw holes from the front side of the liquid crystal display, the disassembling operation can be performed in only one direction. Thus the construction of the 24th embodiment has high operability. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0252]      FIGS. 27A and 27B  show the 25th embodiment.  
         [0253]     In the 25th embodiment, the front chassis is not used. The screw B 3  is fixed to a screw hole  21   b  of the bezel  21  and to the screw hole  29   h  of the light source-holding member  29 . The screw B 2  penetrates through a sheet-holding chassis  49 , the light source-holding member  29 , and the back chassis  31  to fix them to each other.  
         [0254]     In performing the operation of replacing the linear light source  28 , as shown in  FIG. 27B , the screw B 2  is removed upward through an opening  21   a  of the bezel  21  to remove the back chassis  31  and the reflecting composite member  30 . In this manner, the linear light source  28  can be replaced. Since the light source-holding member  29  remains fixed with the screw B 3 , the optical sheet group  32  is held by the sheet-holding chassis  49 . Thus the optical sheet group  32  can be prevented from being disassembled. Since the optical sheet group  32  is supported by the four sides of the frame-shaped sheet-holding chassis  49 , the optical sheet group  32  can be prevented from being flexed or dislocated. Thereby the liquid crystal display is capable of favorably maintaining the quality of display. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0255]      FIGS. 28A and 28B  show the 26th embodiment.  
         [0256]     In the 26th embodiment, the front chassis is not used. The optical sheet group  32  is supported by the upper surface of the light source-holding member  29 .  
         [0257]     More specifically, the bezel  21  and the light source-holding member  29  are fixed to each other with the screw B 3 , and the light source-holding member  29  and the back chassis  31  are fixed to each other with the screw B 2 .  
         [0258]     In performing the operation of replacing the linear light source  28 , the screw B 2  is removed through the opening  21   a  of the bezel  21  disposed above the screw B 2 , as shown in  FIG. 28B . Thereby the back chassis  31  and the reflecting composite member  30  can be removed from the light source-holding member  29 . In this way, the linear light source  28  can be removably mounted on the liquid crystal display. Since the light source-holding member  29  remains fixed by the screw B 3 , the optical sheet group  32  is supported by the light source-holding member  29 . Thus the optical sheet group  32  can be prevented from being disassembled. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0259]      FIGS. 29A and 29B  show the 27th embodiment.  
         [0260]     In the 27th embodiment, the front chassis is not used. The back chassis  31  is fixed to a light source-holding member  109  with the screw B 4  threaded upward into screw holes formed on the rear surfaces thereof.  
         [0261]     The lower end of the inner side surface of light source-holding member  109  is cut out to form light source insertion portions  109   a . A cut-out portion  109   b  for positioning an end of the reflecting composite member  30  is formed at the lower end of the light source-holding member  109 . A concave portion  109   c  for positioning the light source-holding member  109  on the back chassis  31  is formed on the lower surface of the light source-holding member  109 . A screw hole  109   g  is formed in penetration through the concave portion  109   c . On the upper surface  109   d  of the light source-holding member  109 , there are formed a projected portion  109   e  and a screw hole  109   f  into which the screw B 2  is threaded.  
         [0262]     The bezel  108  is frame-shaped and has a sectional shape of an inverted L. The bezel  108  has a screw hole  108   a , formed on its surface, into which the screw B 2  is threaded.  
         [0263]     In performing the operation of replacing the linear light source  28 , the screw B 4  is removed toward the rear side of the liquid crystal display, as shown in  FIG. 29B . Thereby the back chassis  31  and the reflecting composite member  30  are removed from the light source-holding member  29 . In this way, the linear light source  28  can be replaced. Since the light source-holding member  109  remains fixed by the screw B 2 , the optical sheet group  32  is supported by the upper surface  109   d  of the light source-holding member  109 . Thus the optical sheet group  32  can be prevented from being disassembled. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0264]      FIGS. 30A and 30B  show the 28th embodiment.  
         [0265]     In the 28th embodiment, the front chassis is not used. A light source-holding member  112  is constructed of a rear receiving member  63  and a front hold-down member  111 .  
         [0266]     A bezel  110  is frame-shaped and has a sectional shape of an inverted L. The bezel  110  has a screw hole  110   b , formed on its surface, into which the screw B 1  is threaded and has an opening  110   a , formed on its surface, through which the screw B 4  is inserted.  
         [0267]     The front hold-down member  111  has a convex portion  111   a , formed on its lower surface, which fits in the concave portion  63   a  of the rear receiving member  63 . The front hold-down member  111  has a cut-out portion  111   c , formed on the lower end of its inner surface, which matches the groove  63   d  of the rear receiving member  63 . The front hold-down member  111  has a screw hole  111   e , formed on its upper surface, into which the screw B 1  is threaded and has a projected portion  111   f . The front hold-down member  111  has a screw hole  111   b  formed in the range from a stepped horizontal outer upper surface thereof to the lower surface thereof.  
         [0268]     The front hold-down member  111  is placed on the rear receiving member  63  with the end portion  28   a  of the linear light source  28  mounted on the groove  63   d  of the rear receiving member  63 . The convex portion  111   a  is fitted in the concave portion  63   a . The screw B 4  is inserted downward into the matched insertion hole  63   c  and the convex portion  111   b  and is fixed to the screw hole  31   b  of the back chassis  31 . The bezel  110  and the light source-holding member  112  are fixed to each other with the screw B 1  threaded downward into the screw hole  111   e  through the screw hole  110   b.    
         [0269]     In performing the operation of replacing the linear light source  28 , as shown in  FIG. 30B , by taking out the screw B 4  upward through the opening  110   a , the linear light source  28  disposed on the groove  63   d  can be taken out to the front side of the liquid crystal display. Since the front hold-down member  111  remains fixed by the screw B 2 , the optical sheet group  32  is supported by the upper surface  111   a  of the light source-holding member  112 . Thus the optical sheet group  32  can be prevented from being disassembled. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.  
         [0270]      FIGS. 31A and 31B  show the 29th embodiment.  
         [0271]     In the 29th embodiment, the front chassis is not used. The back chassis  31  is fixed to a rear receiving member  115  with the screw B 4  threaded upward into screw holes formed on the rear surfaces thereof.  
         [0272]     The rear receiving member  115  has a concave portion  115   a , formed on its upper surface, into which the lower surface of the front hold-down member  114  is fitted and a screw hole  115   f  into which the screw B 2  is threaded. The upper end of the inner side surface of the rear receiving member  115  is cut out to form a groove  115   d  on which an end portion  28   a  of the linear light source  28  is mounted. A cut-out portion  115   e  for holding down the reflecting composite member  30  is formed at the lower end of the inner side surface of the rear receiving member  115 . The rear receiving member  115  has a concave portion  115   b , formed on its lower surface, for placing the rear receiving member  115  in position. A screw hole  115   c  is formed in penetration through the concave portion  115   b.    
         [0273]     The front hold-down member  114  has a convex portion  114   a , formed on its lower surface, which fits in a concave portion  115   a  of the rear receiving member  115 . The front hold-down member  114  has a cut-out portion  114   c , formed on the lower end of its inner surface, which matches the groove  115   d . Formed on the upper surface  114   a  of the front hold-down member  114  are a projected portion  114   f , a screw hole  114   e  into which the screw B 1  is threaded, and a screw hole  114   b  formed downward to the lower end thereof.  
         [0274]     In performing maintenance for replacing the linear light source  28 , as shown in  FIG. 31B , by taking out the screw B 2  upward through the opening  110   a , the linear light source  28  disposed on the groove  115   d  can be taken out to the front side of the liquid crystal display. The front hold-down member  114  remains fixed to the bezel  110  with the screw B 1 . Thereby the optical sheet group  32  is supported by the upper surface  114   a  of the front hold-down member  114 . Thus the optical sheet group  32  can be prevented from being disassembled. The other constructions are similar to those of the above-described embodiments. Thus they are denoted by the same reference numerals as those of the above-described embodiments and description thereof is omitted herein.