JP2015035430A - Backlight device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backlight device enabled to lower the cost drastically and to promote the simplification of an assembly process thereby to improve the productivity.SOLUTION: A backlight device comprises: an optical reflection member including a first peripheral reflection part and a second peripheral reflection part having a trapezoidal shape, in which a lower bottom is longer than an upper bottom, and an extending piece part formed on the lower bottom of at least one of said first peripheral reflection part and said second peripheral reflection part; and a frame including two first side wall parts facing the bottom face part and two second side wall parts. In the state where said optical reflection member is attached to said frame, said bottom surface reflection part, said first peripheral reflection part and said second peripheral reflection part are arranged in said frame, and said extending piece part is arranged over at least any of said first side wall part and said second side wall part.

Description

The present invention relates to a backlight device.

  FIG. 1 is a schematic configuration diagram showing a general backlight unit of a general liquid crystal module in an exploded state. The liquid crystal module is a module including a liquid crystal cell (not shown) and a backlight device arranged immediately below the liquid crystal cell.

  In the figure, reference numeral 1 denotes a linear light source made of a fluorescent tube such as a straight tube type or a U-shaped tube type, and the end electrode of the linear light source 1 is inserted into a power supply socket 2. A light reflecting member 3 whose surface is a reflecting surface is disposed on the back of the linear light source 1, and light of the linear light source 1 reflected by the light reflecting member 3 is not shown in a liquid crystal cell. Is irradiated from the back. Further, between the light reflecting member 3 and the liquid crystal cell, necessary types and number of optical sheets 4 such as a light diffusing plate are arranged. The light reflected by the reflecting surface of the light reflecting member 3 passes through the optical sheets 4 and irradiates the liquid crystal cell from the back, so that the luminance balance of the image display surface of the liquid crystal cell is maintained. ing. In FIG. 1, reference numeral 5 denotes a frame frame. The frame frame 5 has a function of holding the light reflecting member 3 and the optical sheets 4 in addition to the linear light source 1 described above, and is made of a resin molded body. Or made of sheet metal.

  FIG. 6 is a plan view illustratively showing the linear light source 1 and the light reflecting member 3 mounted on the frame 5. The light reflecting member 3 has a reflection surface on the entire surface or substantially the entire surface. As shown in the figure, the reflecting surface is inclined from one wide rectangular central region Z1 located at the back of the linear light source 1, and from each of the four sides 11, 12, 13, and 14 of the central region Z1. It is divided into elongated trapezoidal peripheral areas Z2, Z3, Z4, and Z5 that are raised in the posture.

  In the conventional backlight device, the light reflecting member 3 shown in FIG. 1 or FIG. 6 is formed by the bendable sheet body 6 shown in the schematic perspective view of FIG. 7 and the injection molding method shown in FIG. It was formed by combining the frame material 7 made of a resin molded body to be molded.

  The sheet body 6 shown in FIG. 7 has a substantially rectangular outer contour shape, and is shown along straight folding lines L1 and L2 defined in the vicinity of each of the two long sides. Is bent. Then, the sheet body 6 is bent and held in the shape of FIG. 7, so that the sheet body 6 has a rectangular central region Z1 and two trapezoidal peripheral regions Z2 on both sides of the central region Z1. Z4 was formed. In the two peripheral areas Z2 and Z4 formed by the sheet body 6, the longitudinal edges 61 and 61 of the peripheral area Z2 on one side and the longitudinal edges of the peripheral area Z4 on the other side 62, 62 are formed in such a shape that their mutual distance is farther away from the fold line L1 or the fold line L2, and the peripheral regions Z2, Z4 are formed by forming the respective edges 61, 62 in that way. Is formed in a trapezoidal shape.

  Further, the frame material 7 shown in FIG. 8 is a resin molded body molded by the injection molding method as described above, and has an inclined and elongated trapezoidal reflecting surface. The frame material 7 is disposed symmetrically on both sides in the longitudinal direction of the sheet body 6 shown in FIG. The elongated trapezoidal reflecting surfaces of the frame members 7 are used as the other two peripheral regions Z3 and Z5 shown in FIG. The end of the elongated trapezoidal reflecting surface of the frame member 7 is abutted against the ends of the elongated trapezoidal peripheral areas Z2 and Z4 formed by the sheet body 6. According to the configuration, the four peripheral regions Z2 to Z5 are connected in a rectangular ring shape.

  On the other hand, the backlight apparatus which reflected the light of the light source with the reflecting plate is conventionally known (for example, refer patent document 1 and patent document 2). Patent Document 1 proposes a direct-type hacklight device in which unevenness of brightness is not generated by providing a peak portion on a reflection plate. Moreover, in patent document 2, generation | occurrence | production of the curvature of a reflecting plate is prevented by making a reflecting plate into a multilayer structure.

JP 2004-102119 A JP 2004-55182 A

  However, as in the conventional backlight unit of the liquid crystal module of the conventional example described at the beginning, the light reflecting member 3 is composed of two frame members made of the sheet body 6 shown in FIG. 7 and the resin molded body shown in FIG. 7 is combined, the number of parts necessary for configuring the light reflecting member 3 becomes three parts, that is, the sheet body 6 and the two frame members 7, which causes an increase in cost. In addition to this, the assembly process becomes complicated and productivity is lowered.

  The present invention has been made under the above circumstances, and the light reflecting member of the direct type backlight device is formed by a single component, and measures that can reduce the cost of the single component at low cost are taken. Accordingly, it is an object of the present invention to provide a backlight device that makes it easy to achieve a significant cost reduction, and that facilitates simplification of the assembly process and improves productivity.

A backlight device according to the present invention includes a light source,
A bottom reflecting portion having two second sides facing each other, and a base whose upper base is connected to each of the first sides and whose lower bottom is longer than the upper base. Two first peripheral reflectors having a shape, two trapezoidal second peripheral reflectors having an upper base connected to each of the second sides and having a lower bottom longer than the upper base, and the first A projecting piece portion extending from a lower base of at least one of the peripheral reflection portion and the second peripheral reflection portion, and the first peripheral reflection portion extends from the first side portion, and A light reflecting member extending from each of the second side portions and reflecting light emitted from the light source;
It has a bottom part, two opposing first side wall parts, and two opposing second side wall parts, and the first and second side wall parts extend from the periphery of the bottom part to one side. A frame in which the inside of the frame is defined by the first side wall and the second side wall,
In a state in which the light reflecting member is attached to the frame, the bottom surface reflecting portion, the first peripheral reflecting portion, and the second peripheral reflecting portion are disposed inside the frame, and the projecting piece portion is the first piece. It is set as the structure distribute | arranged on at least any one of a side wall part and a said 2nd side wall part.

  The first peripheral reflection part and the second peripheral reflection part may have an isosceles trapezoidal shape.

  Further, in the state where the light reflecting member is attached to the frame, the projecting piece portion may extend in parallel to the bottom surface reflecting portion.

  The overhang piece may be provided on the bottom of the first peripheral reflection part and the second peripheral reflection part.

  In addition, the oblique sides of the set of the first peripheral reflection part and the second peripheral reflection part adjacent to each other may be overlapped with the light reflection member attached to the frame.

  Further, each overlapping line formed at the diagonal position of the pair of the adjacent first peripheral reflection part and the second peripheral reflection part overlapped with each other corresponds to the diagonal position of the bottom surface reflection part. It is good also as not being located on the diagonal line.

  Further, in a state where the light reflecting member is attached to the frame, one of the first peripheral reflecting portion and the second peripheral reflecting portion in a set of the first peripheral reflecting portion and the second peripheral reflecting portion adjacent to each other. The hypotenuse may be in contact with the inside of the other hypotenuse.

  The overhang piece portion may be provided over the entire lower bottom.

  Moreover, it is good also as a clearance gap existing between the said bottom face reflection part and the said bottom face part in the state in which the said light reflection member was attached to the said flame | frame.

  In addition, at least one of the four reflecting portions of the first peripheral reflecting portion and the second peripheral reflecting portion is at least one of the four side wall portions of the first side wall portion and the second side wall portion. It may be coincident with the top inner corner.

Further, at least one of the four side wall portions of the first side wall portion and the second side wall portion is erected vertically from the bottom surface portion,
A space may be configured by the side wall portion erected vertically and at least one of the four reflection portions of the first peripheral reflection portion and the second peripheral reflection portion.

  Moreover, it is good also as providing further the optical sheet by which an edge part is mounted on at least one of the said protrusion piece parts.

  Moreover, the length of the width | variety of the said protrusion piece part is good also as being below the length of the width | variety of the said corresponding 1st side wall part or the said 2nd side wall part.

  Further, the inclination angles of the adjacent hypotenuses in the set of the adjacent first peripheral reflection portion and the second peripheral reflection portion may be the same.

  As described above, according to the backlight device according to the present invention, the light reflecting member is formed of a single component and the expensive frame material described in the conventional example is not necessary, so that the cost can be greatly reduced. In addition, it is possible to promote the simplification of the assembly process through the reduction of the number of parts and to improve the productivity.

It is the disassembled schematic block diagram which showed the direct type | mold backlight apparatus of the general liquid crystal module. It is a schematic perspective view of the sheet | seat body used as a light reflection member. It is the top view which expanded and showed the sheet | seat body of FIG. It is an enlarged plan view of the principal part which unfolded and showed the sheet object. It is a schematic plan view of a direct type backlight device using only one sheet body as a light reflecting member. It is the top view which showed the linear light source and the light reflection member explanatory. It is a schematic perspective view of the sheet | seat body used as a light reflection member in the prior art example. It is a schematic perspective view of the frame material used as a light reflection member in the conventional example.

  The liquid crystal module is a module including a liquid crystal cell (not shown) and a backlight device arranged immediately below the liquid crystal cell. The direct type backlight device of the liquid crystal module according to the embodiment has a general configuration similar to that already described with reference to FIG. That is, the end electrode of the linear light source 1 made of a fluorescent tube such as a straight tube type or a U-shaped tube type is inserted into the power supply socket 2. A light reflecting member 3 whose surface is a reflecting surface is arranged on the back of the linear light source 1, and the light of the linear light source 1 reflected by the light reflecting member 3 is not shown in the liquid crystal cell. Irradiate from the back. Further, between the light reflecting member 3 and the liquid crystal cell, necessary types and number of optical sheets 4 such as a light diffusing plate are arranged. The light reflected by the reflecting surface of the light reflecting member 3 passes through the optical sheets 4 and irradiates the liquid crystal cell from the back, so that the luminance balance of the display surface of the liquid crystal cell is maintained. Yes. In addition to the linear light source 1, the light reflecting member 3 and the optical sheets are held by the frame frame 5. The frame frame 5 is made of a resin molded body or a sheet metal.

  FIG. 2 is a schematic perspective view of the sheet body 8 used as the light reflecting member 3. In this embodiment, the entire light reflecting member 3 shown in FIG. 1 is formed by only one sheet body 8 shown in FIG. 2, and the light reflecting member 3 is shown in FIG. The sheet body 6 and the frame material 7 shown in FIG. 8 are not combined.

  As shown in FIG. 2, the sheet body 8 includes the rectangular central region Z1 described with reference to FIG. 6 and four trapezoidal peripheral regions Z2, Z3, Z4, and Z5 around the rectangular central region Z1. Yes. That is, four trapezoidal peripheral areas Z2, Z3, Z4, and Z5 are formed by bending four places around the sheet body 8 along straight folding lines L11, L12, L13, and L14 as shown in the figure. In addition, a rectangular central region Z1 having four side portions 11, 12, 13, and 14 formed by the fold lines L11, L12, L13, and L14 is formed. Therefore, the rectangular central region Z1 is a wide rectangular region surrounded by the four sides 11, 12, 13, and 14. Further, the trapezoidal peripheral areas Z2, Z3, Z4, and Z5 are elongated trapezoidal areas raised in an inclined posture from each of the four sides 11, 12, 13, and 14 of the central area Z1. .

  FIG. 3 is a plan view showing one sheet body 8 developed. As shown in the figure, the unfolded sheet body 8 has a shape in which a V-shaped cut C having the same shape is formed in each of the four corners of the rectangular sheet-shaped material. A straight line connecting the valleys of each other corresponds to the bending lines L11, L12, L13, and L14 described above. A rectangular area surrounded by the fold lines L11, L12, L13, and L14 corresponds to the central area Z1. Therefore, the formation positions of the folding lines L11, L12, L13, and L14 correspond to the four side portions 11, 12, 13, and 14 of the rectangular central region Z1.

  Further, the outer regions of the four folding lines L11, L12, L13, and L14 described above all form a trapezoidal shape, and these trapezoidal regions are the above-described four peripheral regions Z2, Z3, Z4. It corresponds to Z5. In the sheet body 8 shown in FIG. 3, narrow and long protruding pieces 81, 82, 83, and 84 are continuously provided on the outer edges of the four trapezoidal peripheral areas Z2, Z3, Z4, and Z5. It is.

  In the sheet body 8 shown in FIG. 3, the sheet body 8 is shown in FIG. 2 by bending the trapezoidal region into an inclined posture along the four straight folding lines L11, L12, L13, and L14. If the shape is maintained, the rectangular central region Z1 and the trapezoidal peripheral regions Z2, Z3, Z4 raised in an inclined posture from each of the four side parts 11, 12, 13, 14 of the central region Z1. , Z5 are formed. And between the two trapezoidal peripheral areas (Z2 and Z3, Z3 and Z4, Z4 and Z5, Z5 and Z2) that are adjacent to each other with a corner at an arbitrary position in the rectangular central area Z1 between them. The end portions of the regions are abutted so as not to form a gap. These abutting locations are indicated by symbol a in FIG. In addition, the projecting pieces 81, 82, 83, and 84 at the outer edges of the four peripheral regions Z2, Z3, Z4, and Z5 are bent outward. These overhanging pieces 81, 82, 83, and 84 correspond to portions supported by the frame frame 5 shown in FIG.

  According to the direct type backlight device having the configuration described above, the light reflecting member 3 is formed by only one sheet body 8, and the sheet body 8 is a substantially rectangular sheet material having the shape shown in FIG. Since it is formed only by bending the four surroundings obliquely, the manufacturing cost of the light reflecting member 3 is much lower than that of the conventional example. Further, the assembly process of the light reflecting member 3 is remarkably simplified as compared with a process requiring skill in combining the sheet body 6 shown in FIG. 7 and the frame material 7 shown in FIG. 8 as in the conventional example. Is done. Therefore, simplification of the assembly process of the direct type backlight device is promoted, and the productivity is easily improved. Nevertheless, there is no gap at the boundary portion (butting location a) between two adjacent trapezoidal peripheral regions, and as a result, excellent light reflectivity equivalent to that of the conventional example is exhibited. Brightness unevenness hardly occurs in the liquid crystal cell.

  FIG. 4 is an enlarged plan view of a main part in which the sheet body 8 is developed. In this case, in the sheet body 8, two trapezoidal peripheral areas (Z2 and Z3 are exemplarily shown in FIG. 4) adjacent to each other with one corner of the rectangular central area Z1 interposed therebetween. An insertion piece 85 is continuously provided at the end of one side region, for example, the peripheral region Z2. On the other hand, a slit 86 into which the insertion piece 85 can be inserted is formed at the end of the peripheral region Z3 which is the other side region. Although not shown in the figure, one of two other peripheral regions (Z3 and Z4, Z4 and Z5, Z5 and Z2, etc.) adjacent to each other with the other corners of the rectangular central region Z1 in between. Insertion pieces are also formed in the side region, whereas slits into which the insertion pieces can be inserted are formed in the other region. Each insertion piece 85 has a protrusion on its side.

  When the unfolded sheet body 8 has the above-described shape or structure, the sheet body 8 is obliquely bent along the fold lines L11, L12, L13, and L14 to the shape shown in FIG. While retaining the shape, it is possible to insert the insertion piece 85 in the one side region into the slit 86 in the other side region from the reflection surface side. If the insertion piece 85 is inserted into the slit 86 from the reflective surface side in this way, the two peripheral regions on one side and the other side (Z2 and Z3, Z3 and Z4, Z4 and Z5, Z5 and Z2) are slit 86. It is connected at the insertion point of the insertion piece 85 to the. Therefore, the shape retention of the sheet body 8 in the shape shown in FIG. 2 is improved, the stability of light reflection by the sheet body 8 is improved, and uneven brightness of the liquid crystal cell is less likely to occur.

  FIG. 5 is a schematic plan view of a direct type backlight device using the sheet body 8 having the shape shown in FIG. 2 as the light reflecting member 3. In this backlight device, a reflecting surface that is required to be formed on the light reflecting member 3, specifically, a rectangular central region Z1 located at the back of the linear light source 1, and the central region Z1 The trapezoidal peripheral areas Z2, Z3, Z4, and Z5 raised from the four side portions 11 to 14 in an inclined posture are all formed by only one sheet body 8. Therefore, it is not necessary to combine the sheet body 6 shown in FIG. 7 and the frame material 7 shown in FIG. 8 to form the rectangular central region Z1 and the four trapezoidal peripheral regions Z2, Z3, Z4, and Z5. . Therefore, according to this embodiment, the light reflecting member 3 can be formed by only one sheet body 8, and it is not necessary to use an extra part such as the frame material 7 shown in FIG. Since the number of parts is reduced accordingly, simplification of the assembly process is facilitated. In addition, the sheet body 8 is easily available and much cheaper than the resin molded body molded by injection molding, which is technically advanced and high in manufacturing cost, like the frame material 7 shown in FIG. By adopting the configuration of this embodiment, it becomes possible to provide a liquid crystal module direct type backlight device at a much lower cost. Furthermore, it helps to reduce the weight of the device.

  The linear light source 1 shown in FIG. 5 uses a U-shaped fluorescent tube, and its end electrode is connected to the socket in the back space of one peripheral region Z5 of the sheet body 8. Has been. Therefore, the linear light source 1 is projected to the back part through the hole part 87 formed in the said peripheral region Z5, and is connected to the socket 2 with the form illustrated in FIG. Further, on the back side of the sheet body 8, a fixing tool 9 is fixed to the frame frame 5, and a clamp 91 of the fixing tool 9 is opened at a formation position of the rectangular central region Z <b> 1 of the sheet body 8. A sheet body 8 protrudes from an opening (not shown). And the appropriate place of the linear light source 1, for example, two places of the bending part shown in figure, is hold | maintained at the clamp 91. FIG.

  In FIG. 1 to FIG. 7, the same reference numerals are given to the same parts or corresponding parts for convenience of explanation.

DESCRIPTION OF SYMBOLS 1 Linear light source 3 Light reflection member 8 Sheet body (light reflection member)
85 Insertion piece 86 Slit L11, L12, L13, L14 Folding line Z1 Central region Z2, Z3, Z4, Z5 Peripheral region

Claims (14)

A light source;
A bottom reflecting portion having two second sides facing each other, and a base whose upper base is connected to each of the first sides and whose lower bottom is longer than the upper base. Two first peripheral reflectors having a shape, two trapezoidal second peripheral reflectors having an upper base connected to each of the second sides and having a lower bottom longer than the upper base, and the first A projecting piece portion extending from a lower base of at least one of the peripheral reflection portion and the second peripheral reflection portion, and the first peripheral reflection portion extends from the first side portion, and A light reflecting member extending from each of the second side portions and reflecting light emitted from the light source;
It has a bottom part, two opposing first side wall parts, and two opposing second side wall parts, and the first and second side wall parts extend from the periphery of the bottom part to one side. A frame in which the inside of the frame is defined by the first side wall and the second side wall,
In a state in which the light reflecting member is attached to the frame, the bottom surface reflecting portion, the first peripheral reflecting portion, and the second peripheral reflecting portion are disposed inside the frame, and the projecting piece portion is the first piece. A backlight device disposed on at least one of the side wall and the second side wall.   The backlight device according to claim 1, wherein the first peripheral reflection part and the second peripheral reflection part have an isosceles trapezoidal shape.   3. The backlight device according to claim 1, wherein the projecting piece portion extends in parallel with the bottom surface reflection portion in a state where the light reflecting member is attached to the frame.   4. The backlight device according to claim 1, wherein the projecting piece portion is provided on a lower base of the first peripheral reflection portion and the second peripheral reflection portion. 5.   The oblique sides of the set of the adjacent first peripheral reflection part and the second peripheral reflection part that are adjacent to each other in a state where the light reflection member is attached to the frame are overlapped with each other. 5. The backlight device according to any one of 4.   Each overlapping line formed by overlapping the hypotenuses of a pair of the adjacent first peripheral reflection part and the second peripheral reflection part and existing at a diagonal position is a diagonal line corresponding to the diagonal position of the bottom surface reflection part. The backlight device according to claim 5, wherein the backlight device is not located above.   In a state where the light reflecting member is attached to the frame, one hypotenuse of the first peripheral reflecting portion and the second peripheral reflecting portion in the set of the first peripheral reflecting portion and the second peripheral reflecting portion adjacent to each other. 5 is in contact with the inside of the other hypotenuse, and the backlight device according to claim 1.   The backlight device according to claim 1, wherein the protruding piece portion is provided over the entire lower bottom.   9. The gap according to claim 1, wherein a gap exists between the bottom surface reflection portion and the bottom surface portion in a state in which the light reflecting member is attached to the frame. Backlight device.   At least one of the four reflecting portions of the first peripheral reflecting portion and the second peripheral reflecting portion is at least one of the four side wall portions of the first side wall portion and the second side wall portion. The backlight device according to any one of claims 1 to 9, wherein the backlight device coincides with a top inner corner. At least one of the four side wall portions of the first side wall portion and the second side wall portion is erected vertically from the bottom surface portion,
The space is constituted by the side wall portion erected vertically and at least one of the four reflection portions of the first peripheral reflection portion and the second peripheral reflection portion. The backlight device according to claim 10.   The backlight device according to any one of claims 1 to 11, further comprising an optical sheet having an end portion placed on at least one of the protruding piece portions.   The length of the width | variety of the said protrusion piece part is below the length of the width | variety of the said corresponding 1st side wall part or the said 2nd side wall part, The any one of Claims 1-12 characterized by the above-mentioned. The backlight device described.   14. The back according to claim 1, wherein an inclination angle of each adjacent hypotenuse in the set of the adjacent first peripheral reflection part and the second peripheral reflection part is the same. Light equipment.

Images