JP5047930B2 - Flat plate and liquid crystal display device - Google Patents

Description

  The present invention relates to a flat plate capable of obtaining relatively high rigidity and strength when a vertical force is applied to the flat surface of the flat portion of the plate material, and more particularly to a liquid crystal display device using the flat plate.

  As a plate constituting a part of the conventional structure or the entire planar portion, as described in Japanese Patent Application Laid-Open No. 2007-318006 (Patent Document 1), while realizing a thinner and lighter electronic device, There was a structure that satisfied the mechanical strength of the entire electronic equipment. In this case, the solution has been achieved by providing a structure having a side wall portion that increases the rigidity of the metal chassis flat surface part on the whole or a part of the outer periphery of the metal chassis flat surface part. In some cases, the side wall portion is a double side wall or is formed so as to protrude on both sides with respect to the metal chassis plane. In addition, the flat portion of the metal chassis has a vertical size within a range of 10 cm to 20 cm, a horizontal size within a range of 20 cm to 40 cm, a flat portion of the metallic chassis within a range of 0.35 mm to 0.65 mm, The height was 3 mm to 15 mm from the chassis plane. This prior art is intended to increase the rigidity by folding the edge portion of the plate material, and has been the mainstream method for increasing the rigidity of the plate material.

  In addition, as described in Japanese Patent Application Laid-Open No. 2006-337776 (Patent Document 2), there is one that reinforces the chassis structure and enables it to be self-supporting by a two-legged table stand column. In this case, the problem has been solved by attaching a plurality of reinforcing members parallel to each other at an appropriate interval in the center in the left-right direction on the rear surface of the chassis. The surface shape of this reinforcing member has been devised to make the U-shape continuous in a wavy shape. This prior art has a structure in which another member is added in the plane of the plate material to increase the rigidity.

  Furthermore, as described in Japanese Patent Application Laid-Open No. 2006-080067 (Patent Document 3), there has been a technique that prevents distortion in the physique direction of the backlight assembly and improves strength. In this case, the problem has been solved by forming a bending preventing portion in a direction crossing the diagonal direction of the bottom surface of the fixing member of the backlight assembly. The bending preventing part is a groove having a predetermined width. Two anti-bending portions were provided symmetrically with each other in the directions intersecting the two diagonal directions, and the two anti-bending portions were alternately connected to each other. The connecting portions are formed in parallel with each other and projecting with a width on the bottom surface of the fixing member. The bending preventing portion is formed to extend to at least one of the diagonal corners of the bottom surface of the fixing member, and the number is limited to four, six, or eight. The angle between them was also limited. This prior art is a method for improving rigidity and strength by adding a reinforcing material having a shape different from that described in Japanese Patent Laid-Open No. 2006-337776 (Patent Document 2) to the central portion of the plate material.

JP 2007-318006 A JP 2006-337776 A JP 2006-080067 A

  Conventionally, for the purpose of increasing the rigidity of the chassis flat part, the edge part of the plate material is folded over the whole or part of the outer peripheral part of the chassis flat part, and the side wall part is formed to be double or convex on both sides with respect to the chassis plane. However, there is no problem as long as it can be accurately molded, but due to the nature of the pressing process, an error is an accessory. Distortion caused by molding errors during chassis or plate forming causes the plate plane to bend, resulting in torsion of the entire plate plane and jump buckling in the direction perpendicular to the plate plane, resulting in poor quality of the plate plane. There was a problem of becoming.

  In addition, in order to increase the rigidity by adding another member in the plane of the plate material, a plurality of reinforcing members parallel to each other at the center of the left and right direction of the rear surface of the chassis are arranged in the vertical direction with an appropriate interval. The structure to be attached to has a problem that the number of attachment processes increases because it is necessary to attach another member, and the cost of parts and the processing cost increase.

  Furthermore, for the purpose of improving the rigidity and strength of the backlight assembly, the structure in which the bending preventing portion having a width in a direction intersecting the diagonal direction of the bottom surface of the fixing member of the backlight assembly requires a press-only die. Therefore, there is a problem that the manufacturing cost is expensive, and since the angle and amount of bending are large, distortion is likely to occur when applied to a thin plate, causing the plate plane to bend, resulting in torsion of the entire plate plane and the plate plane. However, there is a problem that the vertical plane jumping occurs and the quality of the plate flat portion is deteriorated.

  An object of the present invention is to use a flat plate having high torsional rigidity and bending rigidity, or a plate plate having high torsional rigidity and bending rigidity, in which distortion of the plate plane is reduced to prevent torsion of the entire plate plane and jump buckling in the vertical direction of the plate plane. The object is to provide a liquid crystal display device.

  The features of the present invention for achieving the above object are as follows.

(1) In a metal flat plate constituting a flat portion over part or all of a structure, at least one shape unit combining mountain fold and valley fold is formed in the flat portion. To do.

(2) In the above (1), the shape unit is a combination of triangular faces.

(3) In the above (1), a coining process is performed in which a wedge-shaped groove having a thickness less than the plate thickness is driven into a portion corresponding to a mountain fold or a valley fold.

(4) In the above (1), a folded portion is formed at the edge of the flat plate.

(5) In a liquid crystal display device including a liquid crystal display panel and a backlight, the backlight includes a metal base plate, a reflective sheet placed on the base plate, and a plurality of pieces disposed on the reflective sheet. A light source, and an optical sheet disposed between the light source and the liquid crystal display panel, and the base plate has a convex surface along a vertical direction of the liquid crystal display panel. It is formed by bending.

(6) In the above (5), the convex surface is convex in a direction opposite to a direction facing the liquid crystal display panel.

(7) In the above (5), the convex surface is convex in a direction facing the liquid crystal display panel.

(8) In a liquid crystal display device including a liquid crystal display panel and a backlight, the backlight includes a metal base plate, a reflective sheet placed on the base plate, and a plurality of pieces disposed on the reflective sheet. And a base sheet is formed on the surface facing the liquid crystal display panel at least one shape unit combining mountain folds and valley folds. It is characterized by that.

(9) In the above (8), the shape unit is a combination of triangular faces.

(10) In the above (8), a coining process is performed in which a wedge-shaped groove having a thickness less than the plate thickness is driven into a portion corresponding to a mountain fold or a valley fold.

(11) In the above (8), a pedestal that is recessed toward the liquid crystal display panel is formed on the base plate, and a support member that supports the optical sheet is installed on the pedestal.

  The present invention reduces the distortion of the plate plane so that the entire plate plane is not twisted and jumping buckling in the vertical direction of the plate plane does not occur, and parts cost is also processed without attaching another member to the plate plane It is possible to obtain a flat plate that is low in cost and a high-precision flat plate that is limited to the minimum necessary holes. In addition, by using this flat plate, a liquid crystal display device utilizing these characteristics can be obtained.

  An embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an exploded view of a liquid crystal display module LM to which an embodiment of the present invention is applied.

  The backlight assembly BA includes a plurality of optical sheets OF, a plurality of support members PM that support the optical sheets OF, a plurality of electrode tubes FL, and liquid crystal display elements LD that can be supported by sandwiching the electrode tubes FL. It is composed of an electrode tube support member SM located on both sides and a reflection sheet RS. These constituent members are sandwiched between the integral or divided resin frame PF and the base plate BP, and are supported and fixed at predetermined positions by fastening means such as screws. The electrode tube lighting substrate IP is attached to the back surface of the base plate BP.

  The liquid crystal display element LD assembled in a separate process is supported and fixed at a predetermined position by a fastening means such as a screw, being sandwiched between the above-described backlight assembly BA and an integral or divided bezel BZ. At this time, the liquid crystal display element LD is supported between the liquid crystal display element LD and the backlight assembly BA or bezel BZ via elastic bodies FR and RR (not shown), respectively.

  The present invention mainly relates to the base plate BP having a high ratio of the role of maintaining the strength and rigidity of the liquid crystal display module LM among the liquid crystal display modules LM, but can be applied to all flat plate members.

  The base plate BP of the liquid crystal display module LM is a base component that supports all the component parts of the liquid crystal display module LM. The base plate BP is formed by pressing a metal plate, and there is a problem that jump buckling is likely to occur due to a shape error after processing. When jumping buckling occurs, the component parts of the liquid crystal display module LM including the electrode tube FL may be destroyed in the worst case, and it is necessary to prevent jumping buckling.

  The base plate BP generally has a planar structure on the back surface. Therefore, in order to prevent jump buckling, or in order to satisfy torsional rigidity and flexural rigidity to a predetermined specification, the conventional techniques as described above are used. It was applied. However, the thickness of the base plate BP of the liquid crystal display module LM is further reduced for the purpose of cost reduction or the like. Under circumstances where it is required to reduce the thickness, the torsional rigidity and the bending rigidity of the base plate BP are weakened, and the predetermined specifications cannot be satisfied.

  FIG. 2 is a bird's-eye view of the base plate BP model of the liquid crystal display module LM. The long side length of the base plate BP is a, the short side length is b, and the edge portions are bent at right angles on all four sides. The base plate BP is composed of a bottom surface portion BP0 and edge bent portions BP1 to BP4. 3 is a cross-sectional view taken along line XX in FIG. The plate thickness is t, and the edge height after bending is H.

FIG. 4 is an explanatory diagram showing the curved shape of the bottom surface portion BP0 caused by a molding error when the base plate BP is pressed. Assuming that the curved shape of the bottom surface portion BP0 caused by a molding error is an arc shape when the base plate BP is pressed, the deflection amount from the ideal planar shape of the bottom surface portion BP0 is w _max , and one side in the long side length direction. Assuming that the amount of contraction is λ, the relationship between the two is given by the following equation (1).

  FIG. 5 is an explanatory view showing the bending deformation of the bottom surface portion BP0 of the base plate BP due to the virtual compressive load P. FIG. If a contraction amount λ on one side in the long side length direction is generated by the virtual compression load P, assuming that the cross-sectional area in the short side direction of the base plate BP is A (= t {2H + b−2t}) and the Young's modulus is E, The following equation (2) is obtained.

The compression load P _cr when the bottom surface portion BP0 of the base plate BP _buckles is expressed by the following equation (3), where I is the moment of inertia of the cross section of the base plate BP.

Therefore, since the maximum bending amount w _{max at which} the bottom surface portion BP0 of the base plate BP does not buckle is P _cr <P, the following equation (4) is obtained.

On the other hand, when the maximum initial deflection amount that does not cause jumps buckling on the bottom BP0 of the base plate BP and c _0, is defined by the following equation (5).

  Here, if the amount m ≧ 1 related to the shape of the beam, jumping buckling does not occur. From this, it can be seen that only the thickness t of the base plate BP is determined regardless of the values of the long side length a of the base plate BP and the short side length b of the base plate BP.

Figure 6 is an explanatory view showing an initial deflection _{c 00} of the bottom portion BP0 of the base plate BP, the relationship between the concentrated load _{P 1} when the bottom portion BP0 of the base plate BP succumb interlaced seat. When the amount m related to the shape of the base plate BP given by the equation (5) is used, the following equation (6) is obtained, and the force that causes the jump buckling from the initial state has a value of + (plus).

From this, according to the specifications load bearing, it can be seen that can prevent jumps buckling of the bottom portion BP0 of the base plate BP by providing an initial deflection c ₀₀ to saddle to the bottom portion BP0 of the base plate BP.

Figure 7 is a bird's-eye view showing a state in which a initial deflection c ₀₀ to saddle to the bottom portion BP0 of the base plate BP of this concept to the original. In this case, the same effect can be expected when the initial deflection c ₀₀ is provided in any direction.

  FIG. 8 to FIG. 10 are cross-sectional views in the long side direction of the liquid crystal display module LM showing three different types in which the flexure structure according to one embodiment of the present invention is applied to the base plate BP of the liquid crystal display module LM. The basic structure of the backlight assembly BA of the liquid crystal display module LM includes a plurality of optical sheets OF, a plurality of support members PM2 and PM4 that support the optical sheets OF, a plurality of electrode tubes FL, and the electrode tubes. A backlight assembly BA composed of electrode tube support members SM11, SM12, SM21, SM22 and a reflective sheet RS positioned on both the left and right sides of the liquid crystal display element LD that can be supported with the FL interposed therebetween is integrated or divided resin. The structure is sandwiched between the frame PF2, PF4 and the edge bent portions BP2, BP4 of the base plate BP, and is supported and fixed at a predetermined position by fastening means such as screws. In this basic structure, an electrode tube lighting substrate IP (not shown) is attached to the back surface of the base plate BP. The actual electrode tube FL is supported at both ends by electrode fittings EP (not shown) fixed to the electrode tube support members SM12 and SM22 by fastening means such as screws.

  The liquid crystal display element LD assembled in a separate process is supported and fixed at a predetermined position by a fastening means such as a screw so as to be sandwiched between the above-described backlight assembly BA and the integral or divided bezels BZ2 and BZ4. At this time, elastic bodies ER11, ER12, ER21, and ER22 are provided between the liquid crystal display element LD and the backlight assembly BA or the bezels BZ2 and BZ4, respectively, thereby supporting the liquid crystal display element LD.

FIG. 8 is a cross-sectional view of an embodiment in which an initial deflection c ₀₀ is provided in the downward direction of the drawing with respect to the entire bottom surface portion BP 0 of the base plate BP. In order to maintain the reflection sheet RS in a predetermined shape (in the drawing, a planar shape parallel to the surface of the liquid crystal display element LD), a plurality of base diaphragms BPT2 and BPT4 are provided at appropriate locations on the base plate BP. The base stops BPT2 and BPT4 are formed by recessing the base plate BP, and the tops thereof have a surface parallel to the extending direction of the fluorescent tube FL. A reflective sheet RS is seated on top of the base diaphragms BPT2 and BPT4, and support members PM2 and PM4 are attached so as to penetrate the base diaphragm and the reflective sheet. Thereby, the reflection sheet RS is fixed to the pedestal stops BPT2 and BPT4 on the bottom surface of the base plate.

  Further, as a modification of the present embodiment, a case where the base stops BPT2 and BPT4 are not provided is also conceivable. In this case, as shown in FIG. 26, the lower surface of the support member PM is inclined along the base plate bottom surface portion BP0. Thereby, all of the plurality of fluorescent tubes FL can be held at a uniform height.

FIG. 9 is a cross-sectional view of another embodiment in which an initial deflection c ₀₀ is provided in the downward direction of the drawing with respect to the entire bottom surface portion BP 0 of the base plate BP. Although the basic structure is the same as the structure of the liquid crystal display module LM shown in FIG. 8, the feature of this embodiment is that the liquid crystal display element is provided around the base of the bent portions of the edge bent portions BP2 and BP4 provided around the base plate BP. It is formed so that planes BPP2 and BPP4 parallel to the LD surface are formed. As a result, the liquid crystal module LM can be easily fixed in the vertical direction of the surface of the liquid crystal display element LD to the cabinet of the video receiver.

10, to the entire bottom surface portion BP0 of the base plate BP, is a cross-sectional view of another embodiment in which a initial deflection c ₀₀ upward direction in FIG. The basic structure is the same as the structure of the liquid crystal display module LM shown in FIG. 9, but the feature of this embodiment is that the liquid crystal display element is provided around the base of the bent portions BP2 and BP4 provided around the base plate BP. It is formed so that planes BPP2 and BPP4 parallel to the LD surface are formed. Thereby, also in the present embodiment, the liquid crystal module LM can be easily fixed to the cabinet or the like of the video receiving device in the vertical direction of the surface of the liquid crystal display element LD.

As in the embodiment shown in FIG. 10, when the initial deflection c ₀₀ is provided in the upward direction in the figure, when the display surface of the liquid crystal display module LM is placed upward in the assembly process of the liquid crystal display module LM, it is placed stably. There is an advantage that you can. On the other hand, when the initial deflection c ₀₀ is provided in the downward direction of the drawing as in the embodiment shown in FIGS. 8 and 9, there is an advantage that the thickness of the entire liquid crystal display module LM can be reduced.

  FIG. 11 is a three-side view of an embodiment in which a folding structure according to another embodiment of the present invention is applied to the base plate BP of the liquid crystal display module LM. FIG. 12 is a perspective view of a three-side view of the base plate BP shown in FIG. In this embodiment, a plurality of unit patterns UP (three in the case of this embodiment) are arranged so that the unit pattern UP of the folding structure using a so-called “Yoshimura pattern” that normally forms a cylindrical shape is close to a plane. The structure is arranged in the direction.

From the reference plane RP that passes through the fold line parallel to the lateral width of the unit pattern UP of the folded structure a, the lateral width length of the unit pattern UP of the folded structure that is also the long side length of the base plate BP is a, b is the short side length of the base plate BP C is the maximum height to the highest point SP, d is the maximum sinking depth from the reference plane RP passing through the fold parallel to the lateral width of the unit pattern UP of the folded structure to the lowest point NP, and the highest point SP and the lowest point NP. The angle between the waveform line AL connecting the reference line RP and the reference plane RP is θ ₂ , and is parallel to the reference plane RP up to the intersection CP between the waveform line AL connecting the highest point SP and the lowest point NP and the reference plane RP and the lowest point NP. direction of the vector length e such, the slope length of the waveform WF possible in the short side direction h, ₁ slope angle of the waveform WF possible in the short side direction _theta, normals of the reference plane RP of the base plate BP, the highest point S The lowest point NP connecting it to a length of the point of intersection between the normal line of the waveform line AL and R, the number obtained by doubling the unit pattern UP number of structural bending of the base plate BP and n.

  When the maximum height c from the reference plane RP passing through the fold parallel to the lateral width of the unit pattern UP of the folded structure to the highest point SP is expressed by other variables, the following expression (7) is obtained.

  Therefore, from equation (7), the smaller the slope length h of the waveform WF that can be formed in the short side direction of the base plate BP, that is, the larger the number n that is twice the number of unit patterns UP of the bent structure formed in the short side direction of the base plate BP. The smaller the short side length b of the base plate BP, the smaller the height c from the reference plane RP passing through the fold parallel to the lateral width of the unit pattern UP of the folded structure to the highest point SP, and the height of the entire base plate BP Is suppressed.

The slope length h of the waveform WF formed in the short side direction of the base plate BP, the slope angle θ _{1 of} the waveform WF formed in the short side direction of the base plate BP, the waveform line AL connecting the highest point SP and the lowest point NP and the reference plane RP the angle theta ₂ between the long side length of the base plate BP a, the short side length b, and the maximum height from the reference plane RP until the highest point SP c, the unit pattern uP number of folded structure 2 times the base plate BP When expressed by the number n, the following equations (8), (9) and (10) are obtained.

On the other hand, the length R up to the point where the normal of the reference plane RP of the base plate BP intersects the normal of the waveform line AL connecting the highest point SP and the lowest point NP is the long side length a of the base plate BP, the highest point When expressed by the angle θ ₂ between the waveform line AL connecting the SP and the lowest point NP and the reference plane RP, the following equation (11) is obtained.

Therefore, from equation (11), as the lateral width length a of the unit pattern UP of the folded structure, which is also the long side length of the base plate BP, is larger, the waveform line AL connecting the highest point SP and the lowest point NP and the reference plane RP. The smaller the angle θ ₂ is, the larger the length R to the point where the normal of the reference plane RP of the base plate BP intersects the normal of the waveform line AL connecting the highest point SP and the lowest point NP, and the base plate BP The overall height is suppressed.

  A vector length e in a direction parallel to the reference plane RP up to the intersection CP between the waveform line AL connecting the highest point SP and the lowest point NP and the reference plane RP and the lowest point NP is expressed by the following equation (12).

  Further, since the relationship between the maximum height c from the reference plane RP to the highest point SP and the maximum subsidence depth d from the reference plane RP to the lowest point NP is the following expression (13), the expression (13) and From the equation (7), the following equation (14) is obtained.

  Therefore, if it can be turned back by the maximum sinking depth d from the reference plane RP to the lowest point NP, the overall height of the base plate BP can be suppressed to the maximum height c from the reference plane RP to the highest point SP.

  FIG. 13 is an improvement of the embodiment of FIG. 11 and is a three-side view of another embodiment in which a folding structure is further added to the base plate BP. FIG. 14 is a perspective view of the three-side view of the base plate BP shown in FIG.

  When the present invention is applied to the base plate BP of the liquid crystal display module LM, the length in the short side direction of the base plate BP0 in a state where the folding structure is not applied (flat plate state) is L, the thickness of the base plate BP is t, and the base plate When the density of the BP material is γ, the weight W of the base plate BP and the cross-sectional secondary moment I on the long side are expressed by the following equations (15) and (16).

  If jump buckling occurs when the central portion of the unit pattern UP overlaps the reference plane RP by the force P applied to the unit pattern UP of the folded structure, the Young's modulus of the base plate BP is set to E, and the following equation (17) is obtained.

  Even if a folded structure is added to the short side as shown in FIG. 13 with respect to FIG. 11, the buckling strength P (Equation 17) in FIGS. 11 and 13 does not change.

  The total total thickness of this pattern is c + d in the case of FIG. 11, and d is bent to the c side in FIG. 13, so the total total thickness is c = d. Therefore, by applying the embodiment shown in FIGS. 13 and 14, the overall thickness of the product can be suppressed as compared with the embodiments shown in FIGS. 11 and 12 while maintaining the torsional rigidity and the bending rigidity. There is.

  FIG. 15 is a bird's-eye view of an embodiment in which edge bent portions BP1 and BP3 are provided on the long side portion of the bottom surface portion BP0 of the base plate BP in the structure shown in FIGS. Since the long side direction is constituted by a straight line, the edge bent portions BP1 and BP3 can be formed only by bending. By providing such edge bent portions BP1 and BP3, the synthesis can be further improved. The edge bent portions BP1 and BP3 can obtain the same effect even in a structure bent in the direction opposite to the direction shown in FIG.

  FIG. 16 is a plan view of another embodiment showing a driving structure when the base plate BP shown in FIGS. 13 and 14 is formed by coining. A dotted line CF other than the outer shape indicates coining processing (valley folding direction) from the front side, and a solid line CB indicates coining processing (mountain folding direction) from the back side. FIG. 17 is a three-view diagram illustrating the driving direction and the shape when coining is performed on the base plate bottom surface part BP0 for the actual liquid crystal display module LM. The coining process CF from one direction (front side) and the coining process CB from the reverse direction (back side) are separately displayed. The coining process is generally a wedge shape driven to a depth less than the thickness of the base plate material. For this reason, there is almost no change in the overall plate thickness before and after coining. By applying this example, there is no significant change in the plate thickness, so the torsional rigidity and bending rigidity are somewhat inferior to the examples shown in FIGS. There is an effect that can.

  18 to 25 are bird's-eye views showing other embodiments of the folding structure base plate BP of the present invention.

  FIG. 18 is a bird's-eye view showing an embodiment in which only one unit pattern UP having a folding structure is used on the bottom surface portion BP0 of the bending structure. The highest point SP of the folded structure base plate bottom surface portion BP0 is one in the center of the bottom surface portion BP0, and the lowest point NP of the folded structure base plate bottom surface portion BP0 is one in each of the short side center portions, for a total of two locations. A waveform line AL connecting the highest point SP and the lowest point NP is provided at the central portion in the long side direction.

  FIG. 19 is a bird's-eye view showing another embodiment in which only one unit pattern UP having a folding structure is used on the bottom part BP0 of the folding structure base plate. The highest point SP of the bent structure base plate bottom surface part BP0 is a total of two places, one at each of the upper and lower long sides, and the lowest point NP of the bent structure base plate bottom part BP0 is a total of four points at the four corners. Two waveform lines AL connecting the point SP and the lowest point NP are provided so as to coincide with the long side.

  FIG. 20 is a bird's-eye view of the embodiment in which the unit pattern UP of the folding structure is increased by half each to the left and right in the embodiment shown in FIG. The highest point SP of the bottom part BP0 of the folded structure base plate is a total of two points, one at the center of the upper and lower long sides, and the lowest point NP of the bottom part BP0 of the folded structure base plate is a total of four places at the four corners. A total of two waveform lines AL connecting the point SP and the lowest point NP are provided so as to coincide with the long side.

  FIG. 21 is a bird's-eye view showing an embodiment in which the unit pattern UP of one folding structure is configured to be a straight line in the short side direction on the bottom surface portion BP0 of the folding structure base plate. The highest point SP of the bottom part BP0 of the folded structure base plate BP0 is a total of two places, one at the center of the left and right short sides, and the lowest point NP of the bottom part BP0 of the folded structure base plate BP0 is a total of four places at the four corners. A total of two waveform lines AL connecting the point SP and the lowest point NP are provided so as to coincide with the short side.

  FIG. 22 is a bird's eye view showing another embodiment in which the unit pattern UP of one folding structure is configured to be a straight line in the short side direction on the bottom surface portion BP0 of the folding structure base plate. The highest point SP of the bent structure base plate bottom surface portion BP0 is one in the center of the bottom surface portion BP0, and the lowest point NP of the bent structure base plate bottom surface portion BP0 is one in each of the long side center portions. A waveform line AL connecting the highest point SP and the lowest point NP is provided at the central portion in the short side direction.

  FIG. 23 is a bird's eye view showing an embodiment in which two unit patterns UP of the bending structure shown in the embodiment of FIG. 22 are arranged in a line in the short side direction on the bottom surface portion BP0 of the bending structure. The highest point SP of the bottom surface portion BP0 of the folded structure base plate BP0 is a total of two locations near the center of the bottom surface portion BP0, and the lowest point NP of the bottom surface portion BP0 of the folded structure base is a total of four locations. A total of two waveform lines AL connecting the highest point SP and the lowest point NP are provided in the short side direction.

  FIG. 24 is a bird's-eye view showing an embodiment in which three unit patterns UP of the folding structure shown in the embodiment of FIG. 22 are arranged in a straight line in the short side direction on the bottom surface portion BP0 of the folding structure. The highest point SP of the bottom surface portion BP0 of the folded structure base plate BP0 is a total of three locations in the vicinity of the center of the bottom surface portion BP0, and the lowest point NP of the bottom surface portion BP0 of the folded structure base plate BP0 is a total of six locations. A total of three waveform lines AL connecting the highest point SP and the lowest point NP are provided in the short side direction.

  FIG. 25 is a bird's eye view showing an embodiment in which six unit patterns UP of the folding structure shown in the embodiment of FIG. 22 are arranged in a line in the short side direction on the bottom surface portion BP0 of the folding structure. The highest point SP of the bottom surface portion BP0 of the folded structure base plate BP0 is a total of six locations around the center of the bottom surface portion BP0, and the lowest point NP of the bottom surface portion BP0 of the folded structure base plate BP0 is a total of 12 locations. A total of six waveform lines AL connecting the highest point SP and the lowest point NP are provided in the short side direction.

  As described above, according to the present invention, a flat plate having high torsional rigidity and bending rigidity, in which distortion of the plate plane is reduced so that twisting of the entire plate plane and jumping buckling in the vertical direction of the plate plane do not occur. Alternatively, a liquid crystal display device using the same can be provided.

It is an expansion | deployment exploded view of the liquid crystal display module to which the Example of this invention is applied. It is a bird's-eye view of the baseplate model of a liquid crystal display module. It is sectional drawing of the baseplate model of a liquid crystal display module. It is explanatory drawing which shows the curved shape of the bottom face part which arises by a shaping | molding error when pressing a base plate. It is explanatory drawing which shows the bending deformation of the bottom face part of a baseplate by a virtual compressive load. It is explanatory drawing which shows the relationship between the initial stage bending of the bottom face part of a baseplate, and the concentrated load when the bottom face part of a baseplate carries out jump buckling. It is a bird's-eye view which shows the state which provided the initial stage bending in the bowl shape in the bottom part of the baseplate. It is sectional drawing of the Example which applied the baseplate which provided the initial stage deflection | deviation in the downward direction for the whole bottom face part to the liquid crystal display module. It is sectional drawing of another Example which applied to the liquid crystal display module the baseplate which provided the initial stage bending in the downward direction for the whole bottom face part. It is sectional drawing of the Example which applied to the liquid crystal display module the baseplate which provided the initial stage bending in the upper direction for the whole bottom face part. It is a 3rd page figure of the Example which applied the bending structure to the baseplate of the liquid crystal display module. It is a bird's-eye view of the Example which applied the bending structure to the baseplate of the liquid crystal display module. It is a 3rd page figure of another Example which applied what included the folding structure in the bending structure to the baseplate of the liquid crystal display module. It is a bird's-eye view of another Example which applied what included the folding structure in the bending structure to the baseplate of the liquid crystal display module. It is a bird's-eye view of the Example which provided the edge bending part in the long side part of the bottom face part of a baseplate in what included the folding structure in the bending structure. It is a top view of another Example which made the base plate of the liquid crystal display module of a bending structure into the driving structure by coining process. FIG. 6 is a three-view diagram illustrating a driving direction and a shape when coining is performed on a bottom surface of a base plate for an actual liquid crystal display module. It is a bird's eye view which shows the Example which comprised only the unit pattern of the bending structure in the bending structure baseplate bottom part. It is a bird's-eye view which shows another Example which comprised only the unit pattern of the bending structure in the bending structure baseplate bottom part. It is a bird's-eye view which shows the Example which comprised the unit pattern of two bending structures in the bottom part of the bending structure baseplate. It is a bird's-eye view which shows the Example comprised so that the unit pattern of a bending structure might become a straight line in a short side direction on the bottom face part of a bending structure baseplate. It is a bird's-eye view which shows another Example comprised so that the unit pattern of a bending structure might become a straight line in a short side direction on the bottom face part of a bending structure baseplate. It is a bird's-eye view which shows the Example which arranged and arranged two unit patterns of the bending structure so that it might become a straight line in a short side direction on the bottom face part of a bending structure baseplate. It is a bird's-eye view which shows the Example comprised by arranging three unit patterns of a folding structure on the bottom face part of a folding structure base plate so that it might become a straight line in a short side direction. It is a bird's-eye view which shows the Example comprised by arranging six unit patterns of a folding structure on the bottom face part of a folding structure base plate so that it might become a straight line in a short side direction. It is a figure which shows the modification of support member PM.

Explanation of symbols

LM ... Liquid crystal display module LD ... Liquid crystal display element BA ... Backlight assembly BP ... Base plate BP0 ... Base plate bottom part BP1-4 ... Base plate edge bending part BPT ... Base plate bottom part base stop BPP ... Base plate bottom part liquid crystal display element Flat OF parallel to the surface ... Optical sheet PM ... Support member FL ... Electrode tube SM ... Electrode tube support member EP ... Electrode fitting RS ... Reflective sheet PF ... Resin frame IP ... Electrode tube lighting substrate BZ ... Bezel ER ... Elastic rubber RP ... Reference plane UP of folding structure base plate ... Bending structure or coining unit pattern SP on folding structure base plate or coining base plate ... Maximum point NP of folding structure base plate ... Folding structure base The lowest point AL of the plate… The corrugated line WF connecting the highest point and the lowest point of the folded base plate… The short side corrugated line CF of one embodiment of the folded base plate… The driving line CB from the front side of the coining base plate… The coining base plate Driving line from the back side

Claims (2)

In a liquid crystal display panel and a liquid crystal display device having a backlight,
The backlight includes a metal base plate, a reflective sheet placed on the base plate, a plurality of light sources disposed on the reflective sheet, and an optical sheet disposed between the light source and the liquid crystal display panel. With
The base plate is formed on the surface facing the liquid crystal display panel by forming at least one shape unit combining a mountain fold and a valley fold ,
The shape unit is a combination of triangular faces;
A liquid crystal display device , wherein a coining process is performed in which a wedge-shaped groove having a thickness less than the thickness of the base plate is driven into a portion corresponding to the mountain fold or the valley fold . The liquid crystal display device according to claim 1 .
A liquid crystal display device, wherein a pedestal portion that is recessed toward the liquid crystal display panel is formed on the base plate, and a support member that supports the optical sheet is installed on the pedestal portion.

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