JP2005284106A - Back light unit, liquid crystal display device, and frame member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a back light unit on which a frame member can accurately be mounted even if a grooved projection part formed on a housing of a liquid crystal display (LCD) and the back light unit or an upper or lower side plate of a reflecting plate is curved, and to provide the LCD and frame member. <P>SOLUTION: A groove part 26 is formed along a corner surface 40 of upper and lower frame members 27c and 27d mounted and fixed on the grooved projection part 22 of the housing 21 of the LCD or back light unit 20, or the reflecting plate 24 and even when the groove projection part 22 is pressed to deform, a corner part 38 of the grooved projection part 22 enters the groove part 26 of the frame members 27c and 27d to correct to a reference side the interval between panel ribs 30 and 30 where the external shape of the black light unit 20 and the LCD panel slide to be fixed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a frame member of a backlight device used for a liquid crystal display device (hereinafter referred to as an LCD), and more particularly, a backlight having a frame-shaped frame member divided into four at the upper part of a side plate of a chassis constituting a metal casing. The present invention relates to an improvement of an apparatus, an LCD, and a frame member.

  Conventionally, backlight devices and LCDs have been widely used as display devices for electronic devices such as microcomputers and television receivers. Since the LCD is non-luminous, it requires a light source for external illumination such as a backlight device.

  Such a conventional LCD is roughly divided into a liquid crystal cell and a backlight device. The liquid crystal cell is a color filter, a liquid crystal sealed between two glass substrates on which a TFT (thin film transistor) array is formed, It is comprised with the polarizing plate arrange | positioned at each outer surface of the glass substrate.

  In addition, as a backlight device used in an LCD, it is common to use a thin fluorescent tube (fluorescent lamp) such as a cold cathode tube or a hot cathode tube as a cylindrical light source. An edge light system in which a cylindrical light source is disposed, a reflector (hereinafter referred to as a reflector) and a cylindrical light source are housed in the casing, and the cylindrical light source is disposed in the light transmission diffusion plate disposed in the opening of the casing. There is known a direct system in which direct light from a light source and light from a cylindrical light source reflected by a reflection plate are incident and diffused by a light transmission diffusion plate to emit uniform planar light.

  The direct method or edge light method described above is selected according to the required performance of the LCD, but the direct method uses the direct light of the cylindrical light source, so the light use efficiency is higher than the edge light method and a large monitor This is suitable for applications requiring high brightness such as for televisions and television receivers.

  FIG. 9A is a plan view showing a conventional direct-type backlight device, and FIG. 9B is a cross-sectional view taken along the line AA in FIG. 9A.

  9 (A) and 9 (B), the casing 1 serving as the lamp house of the backlight device 6 is formed in, for example, a rectangular box shape having an opening 1a on the upper surface, and is integrated with a synthetic resin. Molding is performed, or a metal plate or a combination of a metal plate and a synthetic resin for molding is prepared.

  In the housing 1, a highly reflective paint is applied or a highly reflective film material or the like is applied to form the reflector 2 as a reflective surface. In FIG. 9B, the reflecting plate 2 is formed of a plate material having a trapezoidal cross section with four sides inclined.

  The cylindrical light source 3 is held at a position separated from the bottom surface of the housing 1 by about 1 to 2 mm. Plugs provided at both ends of the cylindrical light source 3 are inserted into jacks provided on a cylindrical light source support base obtained by injection molding of highly reflective grade resin to constitute the electrode unit 5. The number of cylindrical light sources 3 arranged in the housing 1 is determined by the luminance required for the LCD and the backlight device 6.

  Each of the above-described components is assembled and disposed so as to cover the light transmission diffusion plate 4 using milky white acrylic resin or the like on the upper surface of the opening 1a, and at least one diffusion sheet is provided on the light transmission diffusion plate 4 A light collecting sheet 9 is disposed. Light emitted radially from the cylindrical light source 3 is reflected directly or by the reflection plate 2 in the housing 1 and reaches the light transmission diffusion plate 4, and is converted into surface emission by the light transmission diffusion plate 4. The backlight device 6 is configured by condensing the light in the normal direction of the illumination surface by the light source 9, and the liquid crystal panel 8 is placed on the diffusion sheet or the light collecting sheet 9 to form an LCD.

The light transmissive diffusion plate 4, the light collecting sheet 9, the liquid crystal panel 8, and the like described above are fixed via holding members attached to flange portions formed on the four sides of the housing 1. Such a backlight device 6 and an LCD are disclosed in Patent Document 1.
Japanese Patent Publication No. 2003-116705 (FIGS. 10 and 11)

  In the above-described conventional backlight device and LCD and frame member, as the LCD becomes larger, the housing constituting the backlight device housing also becomes larger, so that the case is pressed with a sheet metal such as metal. Dimensional accuracy is difficult to achieve.

  For this reason, in a case made of a metal plate or a combination of a metal plate and a synthetic resin for molding, a frame member (LCD panel holder) for holding the LCD panel attached to the upper part of the four-side plate of the case There is an adverse effect that a housing is created in which the mounting dimensions at the panel rib positions are incorrect and the LCD panel cannot be mounted on the backlight device.

  In such a case, the size of the LCD is increased. For example, in the case of 50 inches, the length in the long side direction of the case is about 1000 mm. For example, in the 29 inch LCD, the length in the long side direction of the case is 684 mm. The length is 420 mm.

  The present invention has been made to solve the above-mentioned problems, and the backlight device is enlarged, and the length of the long side and the short side direction of the casing is increased, for example, for 25 inches to 50 inches. In a backlight device in which a frame-shaped frame member molded with a synthetic resin or the like is press-molded into a substantially box shape having an opening on the top surface or a large-sized casing such as Due to variations in processing accuracy during pressing and assembly accuracy during assembling, the LCD panel cannot be held in the panel rib of the frame member, and the LCD panel has a negative effect in the panel rib. A problem to be solved by the present invention is an enlarged backlight device or a backlight device capable of mounting a frame member accurately even if there is a bend in a convex portion formed on an upper or lower side plate of an LCD casing or reflector. An LCD and a frame member are obtained.

  In the backlight device of the first aspect of the present invention, a frame-shaped frame member is provided on the upper portion 4 side of the opening of the substantially rectangular sheet metal casing constituting the lamp house, and a plurality of cylindrical light sources are arranged in the casing. In a backlight device configured to provide a light transmissive diffusion plate on the opening, the cross section is substantially L-shaped so as to cover the groove-shaped convex portion connected to the upper and lower plates of the sheet metal housing. The frame member which has a panel rib on the upper surface and which has a groove formed on one inner surface of the L-shaped piece opposed to the position along the longitudinal direction of the upper and lower side plates of the sheet metal housing is pivoted. is there.

  The LCD according to the second aspect of the present invention is provided with a frame-like frame member on the upper portion 4 side of the opening of the substantially rectangular sheet metal casing constituting the lamp house, and a plurality of cylindrical light sources are arranged in the casing. In a liquid crystal display device configured to provide a liquid crystal panel on a light transmission diffusion plate on the top, a cross section is formed so as to cover the upper part of the groove-shaped convex portion formed to be connected to the upper and lower plates of the sheet metal housing. Is substantially L-shaped, has panel ribs on the top surface, and pivotally attaches a frame member having a groove on one inner surface of the L-shaped piece that opposes the position along the longitudinal direction of the upper and lower plates of the sheet metal housing. It was made.

  The frame member according to the third aspect of the present invention is such that a panel rib for locking the liquid crystal panel is provided on the upper surface, and a groove is formed in the vicinity of the corner of one inner surface having a substantially L-shaped cross section.

  Thus, according to the backlight device and the LCD arrangement frame member of the present invention, even if the backlight device and the LCD are enlarged, the frame is formed even if the convex portions formed on the upper and lower side plates of the casing or the reflection plate are bent. It becomes possible to provide an LCD and a backlight device arrangement frame member on which the member can be accurately mounted.

  Hereinafter, a configuration of a backlight device, a liquid crystal display (LCD), and a frame member according to an embodiment of the present invention will be described with reference to FIGS.

  1A and 1B are side cross-sectional views showing a side cross-sectional view of the frame member of the present invention and the left and right side plates of the housing, and FIGS. 2A and 2B are mounted on the housing or the reflecting plate. FIG. 3 is a perspective view for explaining a method of mounting the LCD panel on the backlight device of the present invention, and FIGS. 4 (A) and 4 (B). ) Is a plan view and a side sectional view showing an embodiment of the backlight device of the present invention, FIGS. 5A, 5B and 5C are a plan view, a front view and a right side view of a frame member used in the present invention, 6A and 6B are schematic plan views of the backlight device, the LCD, and the frame member of the present invention, and a cross-sectional view taken along the line B-B in FIG. 6A, and FIGS. 8A and 8B are a side sectional view showing a normal mounting state of a conventional backlight device and a side sectional view for explaining a defective state. C) (D) (E) is an attachment method described for side cross-sectional view of a deformed state diagram and the frame member of the grooved projections of conventional housing or reflector.

  Prior to the description of FIGS. 1A and 1B and FIGS. 2A and 2B, FIG. 3A to FIG. 5A, FIG. 5B, and FIG. Defects that occur during assembly based on the specific configuration of the light device and the LCD and the manufacturing error of the housing will be described. 3 is a perspective view showing the structure of the assembled backlight device and LCD, FIG. 4A is a plan view of the casing or reflector of the backlight device, and FIG. 4B is B in FIG. -B sectional view, FIGS. 5 (A), 5 (B), and 5 (C) are plan, front, and side views showing a specific structure of a frame-like frame member attached to the upper part of the four sides of the housing or reflector. is there.

  4A and 4B, the backlight device 20 includes upper and lower left and right side plates 21c, 21d, 21L, and 21R and a bottom plate 21b that are substantially rectangular parallelepiped, and an opening that is integrated with the upper and lower left and right side plates 21c, 21d, 21L, and 21R. A flange 21 formed by press-molding flange-like groove-like convex portions 22 and 22 formed on four sides of 21a with aluminum or the like, and the groove-like convex portion 22 of the housing 21 are provided on the upper, lower, left and right side plates 21c, 21d, and 21L from the bottom plate 21b. , 21R is punched out so as to form an inclined portion 34 inclined toward the opening 21a, and is also used as the reflecting plate 24 by forming a reflecting surface on the opening 21a side. In this case, white paint, aluminum foil, or the like is formed as the reflection plate 24 on the inner surface of the bottom plate 21b of the casing 21 as a reflection surface.

  A cylindrical light source support is formed between the left and right plates 21L and 21R and the inclined portion 34 of the reflector 24. This cylindrical light source support portion has an O-ring made of elastic rubber or the like fitted in a through-hole formed in the inclined portion 34 of the casing 21, and the tube wall of the cylindrical light source (lamp) 25 is connected to the center hole of the O-ring. The electrode wire led out from the stem of the lamp 25 is soldered to a printed circuit board or the like disposed on the bottom plate 21 b of the housing 21.

  As shown in FIG. 4A, a plurality of lamps 25 are arranged in parallel between the cylindrical light source support portions so as to be along the long side direction of the casing 21 and parallel to each other in the short side direction. 5A, 5B, and 5C on the flange-like groove-like convex portion 22 extending outwardly in the four directions of the opening 21a and having a substantially L-shaped cross section on the upper surface as shown in FIGS. A groove portion is formed on one inner surface of the L-shaped piece so as to cover the groove-shaped convex portion 22 so as to cover the groove-shaped convex portion 22 so as to oppose the position along the longitudinal direction of the upper and lower side plates 21c, 21d of the casing 21 made of sheet metal. The frame members 27c and 27d made of synthetic resin on which 26 is formed are pivotally attached. In addition, left and right frame members 27L and 27R formed of synthetic resin having a substantially L-shaped cross section are also fixed to the left and right side plates 21L and 21R of the housing 21.

  For example, a light transmission diffusion plate 28 made of milky white acrylic resin and a light collecting sheet 29 are sequentially laminated on the groove-like convex portion 22 formed so as to be connected to the upper and lower plates 21c and 21d of the casing 21 described above. Next, the upper and lower frame members 21c, 21d and the left and right frame members 27L, 27R are fixed to the upper, lower, left, right side plates 21c, 21d, 21L, 21R of the casing 21 from above the condensing sheet 29 via screws or the like. Thus, the backlight device 20 as shown in FIGS. 3 and 4 is formed. In FIG. 3, 33a is a signal processing board, 33b is a connection board for drivers, and the LCD panel 31 is placed on the frame members 27c and 27d of the backlight device 20. Actually, the LCD panel 31 is slid and fixed between the panel ribs 30 and 30 for holding the LCD panel 31 provided on the upper and lower frame members 21c and 21d, so that the LCD panel is placed on the opening 21a of the housing 21. 31 is fixed to constitute the backlight device 20 and the LCD 32.

  A specific configuration of the upper and lower frame members 27c and 27d fixed to the upper and lower plates 21c and 21d used in the present invention will be described with reference to FIGS. The upper and lower frame members 27c and 27d and the left and right frame members 27L and 27R (not shown) are press-molded by mixing 20% glass fiber in a synthetic resin, for example, black polycarbonate. The ribs are erected on the inner side and the outer side of a predetermined position on the horizontal piece 27h on the upper surface. This inner rib becomes the panel rib 30 that holds the LCD panel 31. As shown in the right side view of FIG. 5C, the left and right side surfaces are widened, and the front surface is formed of a horizontal piece 27h and a vertical piece 27v having a substantially L-shaped cross section as shown in FIG. 5B. The left and right side ends are composed of only the horizontal piece 27h of the upper plate material. The total length L of the frame members 27c and 27d is determined by the screen size of the LCD 32. In this example, the length in the long side direction is 618.2 mm.

  FIG. 6A shows a schematic plan view of the above-described backlight device, and FIG. 6B shows a cross-sectional view taken along the line BB in FIG. 6A. Here, the horizontal piece 27h on the upper side of the upper and lower frame members 27c and 27d is placed so as to cover the groove-like convex portion 22 of the casing 21, and the vertical piece 27v orthogonal to the horizontal piece 27h is The backlight device 20 is configured by being fixed to the left and right plates 21c and 21d via screws 36.

  The manufacturing error at the time of pressing the sheet metal casing 21 of the backlight device 20 having such a configuration is now that the casing 21 or the reflecting plate 24 becomes larger when the casing 21 is enlarged to a size of about 30 inches, for example. The machining accuracy error during pressing is about ± 0.1 to ± 0.5 due to sheet metal processing, and the groove-like convex portions 22 of the casing 21 and the reflector 24 pressed with such accuracy are shown in FIG. B) As shown in (C), there is a possibility that the upper and lower side plates 21c, 21d are produced with a C-shaped or inverted C-shaped inclination and pressed.

  8A shows a substantially linear cross section in the vicinity of the groove-shaped convex portion 22 of the case 21 that has been normally pressed, and FIGS. 8B and 8C are inclined and pressed in a letter C or reverse letter H shape. A substantially linear cross section in the vicinity of the groove-like convex portion 22 of the casing 21 is exaggerated. In FIG. 8A, the angle with the upper surface of the groove-like convex portion 22 formed in communication with the lower (upper) side plate 21d (21c) is a right angle, and the width W between the inclined portions 34 and the casing 21 or In contrast to the regular product in which the height H from the reflector 24 to the upper surface of the groove-like convex portion 22 is within the specified dimensions, the lower (upper) side plate 21d (21c) in FIGS. 8B and 8C. Shows the casing 21 or the reflecting plate 24 in which the tilt inclination amounts D1 and D2 are generated on the outer side or the inner side.

  When the upper and lower frame members 27c and 27d are fixed to the housing 21 shown in FIGS. 8B and 8C with screws 33 as shown in FIGS. 8D and 8E, When the upper and lower frame members 21c and 21d are placed on the groove-shaped convex portion 22 of the housing 21 deformed in a letter shape, the upper and lower frame members 21c and 21d are indicated by an arrow E as shown in FIG. As shown in FIG. 8C, the upper and lower frame members are formed on the groove-like convex portion 22 of the casing 21 which is deformed in an inverted C shape. When 21c and 21d are placed and fixed, as shown in FIG. 8E, the upper and lower frame members 21c and 21d are opposite to each other about the vertical pieces 27v of the frame members 27c and 27d and the corner portion 38 inside the horizontal portion 27H. Since it rotates in the clockwise direction and moves outward as indicated by the arrow F, the interval between the panel ribs 30 and 30 increases. To become.

  FIG. 7 is a side sectional view in the case of FIG. 8E in which the frame members 27c and 27d are fixed to the upper and lower side plates 21c and 21d of the groove-like convex portion 22 of each casing 21 in FIG. Shown in (B). 7A and 7B, FIG. 7A shows a state in which the upper and lower frame members 27c and 27d are fixed to the casing 21 manufactured with regular dimensions. When the upper and lower frame members 27c and 27d are fixed to the casing 21 in which the groove-like convex portion 22 having the inclination amount D2 is formed in an inverted C shape as shown in FIGS. As the upper and lower frame members 27c and 27d are tightened to the upper and lower side plates 21c and 21d through the through holes formed in the vertical pieces 27v of the upper and lower frame members 27c and 27d, the upper and lower frame members 27c and 27d become the upper and lower side plates 21c shown in FIG. Since the upper and lower frame members 27c and 27d move outward as indicated by the arrow F as a whole because they are fixed in a state of rotating counterclockwise around the bent corner portion 21d of 21d, the upper and lower frame members 27c , 27d (the outer shape in the short side direction of the backlight device) L1 (for example, L = 383.6 ± 0.5) naturally becomes L1 + ΔL, and the distance L2 between the panel ribs 30 and 30 is also large as L2 + ΔL. Become.

  Therefore, when the external dimensions of the backlight device 20 are increased as described above, the center of the LCD panel 31 is the center of the screen because the LCD panel 31 is biased toward the one panel rib 30 even if the LCD panel 31 is fixed between the panel ribs 30 and 30. This causes a detrimental effect and moves between the panel ribs 30 and 30, so that a detrimental effect such as cutting a TCP (Tape Carrier Package) connected to the connection board 33 b or the like is also caused.

  Further, as described with reference to FIG. 8D, when the outer shape of the backlight device and the dimension between the panel ribs are reduced, the LCD panel 31 cannot be mounted while sliding between the panel ribs 30, and the LCD panel 31 and the backlight device 20 are not mounted. There was a problem of creating a gap between them.

  One mode for solving such a problem will be described with reference to FIGS. FIG. 1A is an enlarged side cross-sectional view showing a case where the casing 21 described in FIG. 7B is pressed in an inverted C shape, and FIG. It is a sectional side view of the upper and lower frame members 27c and 27d.

  As shown in FIG. 1A, the upper and lower frame members 27c and 27d that oppose the corner portion 38 of the groove-like convex portion 22 have a L-shaped horizontal portion 27h and a corner inner surface 40 of the vertical portion 27v as described above. As the entire upper and lower frame members 27c and 27d rotate in the counterclockwise direction CCW around the corner inner surface 40 in accordance with the tightening of 36, the lower surfaces of the horizontal pieces 27h of the upper and lower frame members 27c and 27d It becomes the state which floated from the upper surface of the part 22, and the distance between the panel ribs 30 and 30 will spread.

  Therefore, in this example, as shown in FIG. 1B, a groove 26 having a depth d of about 0.35 mm is formed from the corner inner surface 40 of the upper and lower frame members 27c and 27d to the inner surface of the vertical piece 27v. The direction is formed as shown in FIG. With this configuration, the lower surface of the horizontal portion 27h of the upper and lower frame members 27c and 27d comes into contact with the groove-shaped convex portion 22 of the housing 21 and the corner portion 38 enters the groove portion 26 according to the tightening of the screw 36. Since it is locked in the state shown in (B), the outer shape of the backlight device 20 and the interval between the panel ribs 30 and 30 can be kept constant. That is, in the present invention, the upper surface of the sheet metal casing 21 is connected to the upper and lower side plates 21c, 21d so as to cover the upper surface of the groove-shaped convex portion 22, and the upper surface of the horizontal portion 27h is substantially L-shaped. A frame member having a panel rib 30 and having a groove portion 26 formed on the inner surface of one vertical piece 27v of an L-shaped piece opposed to the position along the longitudinal direction of the upper and lower side plates 21c and 21d of the sheet metal casing 21. May be pivotally mounted on the groove-like convex portion 22.

  Next, a configuration for making the upper and lower frame members 27c and 27d tilted and fixed to the groove-shaped convex portion 22 of the housing 21 vertical will be described with reference to FIGS. 2A is a side cross-sectional view for explaining the mounting state in which the inclination is corrected, and FIG. 2B is a plan view of the groove-shaped convex portion 22 pressed into the letter C shape described in FIG. 8D. It is a sectional side view which shows the state which fixed the upper and lower frame members 27c and 27d. As shown in FIG. 2B, when the frame members 27c and 27d are fixed with screws 36 on the groove-shaped convex portion 22 deformed into a C shape, the upper and lower frame members 27c and 27d are perpendicular to each other. By interposing a spacer 42 between the lower end of the piece 27v and the lower ends of the upper and lower plates 21c and 21d, the frame members 27c and 27d can be held in a substantially vertical state as shown in FIG.

  As the above-mentioned spacers, those obtained by attaching an adhesive tape to both sides of a polyethylene tape can be used. When the spacer 42 is thicker than appropriate as shown in FIG. 2B, the outer shape L1 of the backlight device 20 becomes larger, but the spacer 42 having a limit thickness that does not increase the outer shape is selected, and the distance between the panel ribs 30 and 30 L2 Should be made smaller.

  By forming the groove 26 and attaching the spacer 42 as described above, the outer dimension L1 of the backlight device 20 is 384.20 mm, the dimension between the panel ribs 30 and 30 is L2 = 356.95 mm, and the prescribed outer dimension and the distance between the panel ribs. L1 = 383.81 mm and L2 = 356.48 mm when corrected only by the groove 26 when the size is larger than the range of +0.5 to 1.0 mm, the spacer 42 is interposed, and the above-described groove correction is performed. When corrected by both, L1 = 383.67 mm (normal dimension L1 = 383.6 mm ± 0.5), L2 = 356.25 mm (normal dimension L2 = 356.24 mm ± 0.5) can be corrected, and the deformation Even when the casing 21 or the reflector 24 was used, the backlight device 20 approximated to the design target value could be obtained.

  According to the backlight device, the LCD, and the frame member of the present invention, the enlarged backlight device 20 and the LCD 32 bend to the groove-like convex portions 22 formed on the upper and lower side plates 21c, 21d of the casing 21 or the reflector 24. Even if there is, it is possible to provide a backlight device, an LCD, and a frame member that can accurately mount the frame members 27c and 27d.

It is a sectional side view which shows the butt | matching state with the side sectional view of the frame member used for the liquid crystal display device (LCD) which shows one example of this invention, and a backlight apparatus, and the right-and-left side board of a housing | casing. FIG. 5 is a schematic cross-sectional side view showing a method for correcting a vertical state of a frame member placed on a casing or a reflector used in the LCD and backlight device of the present invention. It is a perspective view for demonstrating the method of mounting | wearing a LCD panel on the backlight apparatus of this invention. It is the top view and side sectional view which show one form example of LCD of this invention, and a backlight apparatus. It is the front view of the frame member used for LCD of this invention, and a backlight apparatus, a top view, and a right view. FIG. 7 is a schematic plan view of an LCD, a backlight device, and a frame member showing an embodiment of the present invention, and a cross-sectional view taken along the line BB in FIG. FIG. 4 is a side sectional view showing a normal mounting state of the LCD and the backlight device of the present invention and a side sectional view for explaining a defective state. It is a sectional view for explaining a deformation state of a groove-like convex portion of a casing or a reflector used in the LCD and the backlight device of the present invention and a side sectional view for explaining a method of attaching a frame member. FIG. 10 is an overall plan view of a conventional LCD and backlight device and a cross-sectional view taken along the line AA in FIG.

Explanation of symbols

20 ... Backlight device, 21 ... Housing, 21a ... Opening, 21b ... Bottom, 21c ... Upper plate, 21d ... Lower plate, 21L ... Left plate, 21R ... Right plate, 22 ... ··· Groove-shaped convex portion, 24 ··· Reflector, 25 ··· Cylindrical light source (lamp), 26 ··· Groove portion, 27c, 27d ··· Upper and lower frame members, 27L, 27R ··· Left and right frame members, 27h ··· Horizontal piece, 27v ... Vertical piece, 28 ... Light transmission diffuser plate, 29 ... Light collecting sheet, 30 ... Panel rib, 34 ... Inclined part, 38 ... Corner part, 40 ... Corner inner face, 36 ... Screw,

Claims (6)

A frame-shaped frame member is provided on the upper part 4 side of the opening of the substantially rectangular sheet metal casing constituting the lamp house, a plurality of cylindrical light sources are arranged in the casing, and a light transmission diffusion plate is provided on the opening. In the backlight device configured to provide
The cross section is substantially L-shaped and has a panel rib on the upper surface so as to cover the upper part of the groove-shaped convex portion formed to be connected to the upper and lower plates of the sheet metal casing, and along the longitudinal direction of the upper and lower plates of the sheet metal casing. A backlight device characterized in that the frame member having a groove formed on one inner surface of the L-shaped piece facing the position is pivotally attached.   The backlight device according to claim 1, wherein the frame member is formed of a synthetic resin or a synthetic resin containing glass fibers.   The backlight device according to claim 1, wherein a spacer is interposed between the frame member and the upper and lower plates of the housing. A frame-shaped frame member is provided on the upper part 4 side of the opening of the substantially rectangular sheet metal casing constituting the lamp house, a plurality of cylindrical light sources are arranged in the casing, and a light transmission diffusion plate is provided on the opening. In a liquid crystal display device configured to provide a liquid crystal panel via
The cross section is substantially L-shaped and has a panel rib on the upper surface so as to cover the upper part of the groove-shaped convex portion formed to be connected to the upper and lower plates of the sheet metal casing, and along the longitudinal direction of the upper and lower plates of the sheet metal casing. A liquid crystal display device, wherein the frame member having a groove formed on one inner surface of the L-shaped piece opposed to the position is pivotally attached.   The liquid crystal display device according to claim 4, wherein a spacer is interposed between the frame member and the upper and lower side plates of the casing.   A frame member characterized in that a panel rib for locking a liquid crystal panel is provided on an upper surface, and a groove is formed in the vicinity of a corner of one inner surface having a substantially L-shaped cross section.

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