JP2016062022A - Box body for backlight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a non-display area of an electronic apparatus to which a liquid crystal display is applied.SOLUTION: A box body for a backlight 100 includes: a rectangular bottom wall part 102 formed of a reflection film 101; a pair of first side wall parts 110 that are erected on the bottom wall part 102 to be opposite to each other in a first direction; and a pair of second side wall parts 120 that are erected on the bottom wall part 102 to be opposite to each other in a second direction. The pair of first side wall parts 110 are formed by bending each of the edges of the reflection film 101 in an L shape to be erected on the bottom wall part 102; the pair of second side wall parts 120 include placement surfaces 122a on which at least a liquid crystal panel is placed, and each of the placement surfaces 122a has a width wider than at least that of an edge surface of the reflection film 101.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a backlight box.

  Some electronic devices such as portable terminals use a liquid crystal display (LCD). In the liquid crystal display, a backlight is disposed on the back of the liquid crystal panel. The backlight irradiates light to the liquid crystal panel by adjusting light from the light source using members such as a light guide plate, a reflection film, a diffusion plate, and other optical films.

  In order to configure a liquid crystal display, the above-described members must be stacked. For example, Patent Document 1 describes that each member for constituting a liquid crystal display is accommodated in a holder (backlight box) having a concave shape. Such a holder is for example made of plastic.

JP 2005-227720 A

  In recent years, it is sometimes required to secure a wide display portion in an electronic device. In such an electronic device, in order to ensure the size of the display unit, it is desired that the region (non-display region) where the display function of the liquid crystal display is not exhibited in the electronic device is made as small as possible.

  Therefore, there is a demand for a backlight box that can reduce a non-display area in an electronic device to which a liquid crystal display is applied.

  A backlight box according to an embodiment of the present invention is a backlight box configured by a reflective film, and is configured by a reflective bottom film and has a rectangular bottom wall portion and a bottom wall portion. A pair of first side walls facing each other in the first direction, and a pair of second side walls standing on the bottom wall and facing each other in the second direction. 1 side wall part is comprised by bending the edge part of a reflective film in L shape so that it may stand up from a bottom wall part, and a pair of 2nd side wall part has a mounting surface which mounts a liquid crystal panel at least. The mounting surface is configured to be wider than at least the end surface of the reflective film.

  According to the backlight box, a backlight member such as a light guide plate is stacked and accommodated in a region (on the bottom wall) surrounded by the first side wall and the second side wall. can do. Then, by placing the liquid crystal panel on the placement surface of the second side wall portion, it is possible to configure a liquid crystal display by arranging a backlight on the back surface of the liquid crystal panel. Here, since the backlight box is composed of a film-like reflective film, the wall of the backlight box is formed more than when the backlight box is configured using, for example, a plastic holder. The thickness can be reduced. Reducing the thickness of the wall of the backlight box leads to reducing the non-display area of the electronic device. In particular, since the first side wall portion is formed by bending the edge of the reflective film in an L shape so as to rise from the bottom wall portion, in the first direction, the wall of the backlight box body The thickness can be reduced to the thickness of the end face of the reflective film. On the other hand, the second side wall portion includes at least a mounting surface on which the liquid crystal panel is mounted, and the mounting surface is configured to be wider than at least the end surface of the reflective film. Accordingly, the liquid crystal panel can be sufficiently supported by the wide mounting surface, and the thickness of the wall of the backlight box in the first direction can be reduced. As described above, the non-display area of the electronic device to which the liquid crystal display is applied can be reduced.

  In the backlight box according to another embodiment, the second side wall portion is formed by bending the edge of the reflective film so as to rise from the bottom wall portion, and the upper end portion of the rising portion is bent. And a first piece that opposes the bottom wall, and the mounting surface may be formed by the first piece.

  In the backlight box according to another embodiment, one of the pair of second side wall portions is configured by bending an edge portion inside the box body of the first piece portion toward the bottom wall portion side. A light emitting unit that emits light to the inside of the box is disposed in a space that is further provided with a second piece, and is surrounded by the rising portion, the first piece, and the second piece, and the second piece is An opening may be made so that the light emitting part is exposed at a position facing the light emitting part, and a space may be closed at other positions.

  In the backlight box according to another aspect, the second side wall portion includes a rising portion configured by bending the edge of the reflective film so as to rise from the bottom wall portion, and the first of the rising portions. And a third piece configured by bending a part of the region in the direction toward the inner side of the box, and the placement surface may be formed by the third piece.

  In the backlight box according to another aspect, the second side wall portion may be configured by disposing the frame body at the edge of the bottom wall portion, and the placement surface may be formed at the upper end of the frame body.

  In the backlight box according to another embodiment, the reflective film may be configured by laminating a multilayer film.

  In the backlight box according to another embodiment, the reflective film may be formed with a hot melt layer that can be welded by applying heat.

  ADVANTAGE OF THE INVENTION According to this invention, the non-display area | region of the electronic device to which a liquid crystal display is applied can be reduced.

It is a disassembled perspective view of a liquid crystal display. It is a figure which shows the detailed structure of the box for backlights concerning embodiment of this invention. It is a figure which shows the method of mounting a liquid crystal panel. It is a figure which shows the box for backlights concerning 2nd Embodiment. It is a figure which shows the box for backlights which concerns on a modification. It is a figure which shows the box for backlights concerning 3rd Embodiment. It is an enlarged view of the structure of the corner | angular part of the box for backlights. It is a figure which shows the box for backlights concerning 4th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

  FIG. 1 is an exploded perspective view of a liquid crystal display. As shown in FIG. 1, the liquid crystal display 1 includes a backlight box 100, a backlight 10, and a liquid crystal panel 700. For example, the backlight 10 includes a backlight member such as a light source 200, a light guide plate 300, a diffusion plate 400, and optical films 500 and 600. In the backlight box 100 according to the present embodiment, a light source 200, a light guide plate 300, a diffusion plate 400, and optical films 500 and 600 are stacked and accommodated. A liquid crystal panel 700 is placed on the backlight box 100. For the light source 200, for example, a light emitting diode (LED) can be used. For example, a prism film or a multilayer film can be used as the optical film. Examples of the optical film include a polarizing film, a reflective polarizing film, a diffuse mixed reflective polarizing film, a diffusing film, a brightness enhancement film, a rotating film, a mirror film, or a combination thereof. As an example of such an optical film, an optical film available from 3M Company of St. Paul, Minnesota under the trade name “DBEF” may be used. The liquid crystal panel 700 may be configured by only the liquid crystal panel, or may be configured by attaching another member (touch panel or the like) to the liquid crystal panel.

  FIG. 2 is a diagram showing a detailed configuration of the backlight box. FIG. 2A is a perspective view of the backlight box, and FIG. 2B is a perspective view showing a state in which the liquid crystal panel is placed on the backlight box.

  Here, in order to describe each direction in the backlight box 100, an XYZ coordinate system is set. As shown in FIG. 2, the backlight box 100 has a substantially shallow box shape, and has a bottom surface 102a, while the side facing the bottom surface 102a is open. Therefore, the bottom surface 102a of the backlight box 100 is a surface that expands in the XY direction. The X axis and the Y axis are orthogonal to each other. The Z axis is orthogonal to the XY plane. The upward direction in the backlight box 100 is defined as the positive Z-axis direction. The positive Z-axis direction is a direction from the bottom surface 102a toward the opening side.

  As shown in FIG. 2, the backlight box 100 is composed of a reflective film 101. The reflective film 101 has a predetermined thickness. As the reflective film 101, for example, a silver reflective film or a multilayer film can be used. In the case of using a multilayer film, for example, a film having a multilayer film structure using a polyester resin, a polymethyl methacrylate resin, or the like can be used. As an example of the reflective film 101, a multilayer film available from 3M Company of St. Paul, Minnesota under the trade names “ESR”, “ESR2”, and “ESR-PT” can also be used. The reflective film 101 has a reflectance of 98% or more, for example. This reflectance becomes higher than the reflectance of a silver reflective film, for example. By adopting such a film having a high reflectance, the liquid crystal panel 700 can be efficiently irradiated with the backlight. In addition, since the backlight can be confined within the backlight box 100 due to the high reflectance, light leakage to the outside of the backlight box 100 can be reduced. Furthermore, since the reflective film 101 is a film shape, the thickness can be reduced. The thickness of the reflective film 101 can be suppressed to, for example, about 10 to 300 μm.

  Examples of suitable materials for the reflective film 101 include polyethylene naphthalate (PEN) and its isomers (eg, 2,6-, 1,4-, 1,5-, 2,7- and 2,3-PEN), Polyalkylene terephthalate (for example, polyethylene terephthalate, polybutylene terephthalate and poly-1,4-cyclohexanedimethylene terephthalate), polyimide (for example, polyacrylimide), polyetherimide, atactic polystyrene, polycarbonate, polymethacrylate (for example, Polyisobutyl methacrylate, polypropyl methacrylate, polyethyl methacrylate and polymethyl methacrylate), polyacrylates (e.g. polybutyl acrylate and polymethyl acrylate), syndiotactic polystyrene (sPS), syndiotactic polystyrene -α-methylstyrene, syndiotactic polydichlorostyrene copolymers and any blends of these polystyrenes, cellulose derivatives (e.g., ethyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate and cellulose nitrate), poly Alkylene polymers (e.g. polyethylene, polypropylene, polybutylene, polyisobutylene and poly (4-methyl) pentene), fluorinated polymers (e.g. perfluoroalkyl resins, polytetrafluoroethylene, fluorinated ethylene-propylene copolymers, polyvinylidene fluoride) And polychlorotrifluoroethylene), chlorinated polymers (for example, polyvinylidene chloride and polyvinyl chloride), polysulfone, polyethers Von, polyacrylonitrile, polyamide, silicone resins, epoxy resins, polyvinylacetate, polyether amides, ionomeric resins, elastomers (e.g., polybutadiene, polyisoprene and neoprene), and polyurethanes, and the like. Also for example copolymers of PEN (for example 2,6-, 1,4-, 1,5-, 2,7- and / or 2,3-naphthalenedicarboxylic acid or esters thereof and (a) terephthalic acid or esters thereof, (b) isophthalic acid or ester thereof, (c) phthalic acid or ester thereof, (d) alkane glycol, (c) cycloalkane glycol, (f) alkane dicarboxylic acid and / or (g) cycloalkane dicarboxylic acid (e.g. terephthalic acid Acid or ester thereof, (a) naphthalene dicarboxylic acid or ester thereof, (b) isophthalic acid or ester thereof, (c) phthalic acid or ester thereof, (d) alkane glycol, (c) cycloalkane glycol (e.g. (F) alkanedicarboxylic acid and / or (g) cycloalkanedicarboxylic acid (e.g. cyclohexanedicarboxylic acid). Mer, etc.), etc. copolymers with), and styrene copolymers (e.g., styrene - butadiene copolymers and styrene - acrylonitrile copolymer), also suitable are copolymers, such as 4,4-bibenzyl acid and ethylene glycol. Each layer may contain a blend of two or more of the above-described polymers or copolymers (for example, a blend of sPS and atactic polystyrene). The coPEN described above is also a blend of pellets in which at least one component is a polymer based on naphthalene dicarboxylic acid and the other component is another polyester or polycarbonate such as PET, PEN or co-PEN. Also good.

  Particularly preferred layer combinations include PET / Ecdel, PEN / Ecdel, PEN / sPS, PEN / THV, PEN / co-PET and PET / sPS. Here, “co-PET” means a copolymer or blend based on terephthalate (as described above), Ecdel is a thermoplastic polyester available from Eastman Chemical Co. Is a fluoropolymer available from 3M Company of St. Paul, Minnesota. The number of layers is preferably less than 10,000, more preferably less than 5,000, and still more preferably less than 2,000.

  The backlight box 100 includes a bottom wall portion 102, a pair of first side wall portions 110, and a pair of second side wall portions 120. The bottom wall 102 is rectangular. The pair of first side wall portions 110 are erected on the bottom wall portion 102 and face each other in the first direction. The pair of second side wall portions 120 are erected on the bottom wall portion 102 and face each other in the second direction. In the example shown in FIG. 2, the bottom wall portion 102 is rectangular. A bottom surface 102 a that is an upper surface of the bottom wall portion 102 is formed by a rectangular portion at the center of the surface of the reflective film 101. The first direction is the X-axis direction and corresponds to the short direction of the backlight box 100 (when unfolded). The second direction is the Y-axis direction and corresponds to the longitudinal direction of the backlight box 100 (when unfolded). However, on the contrary, the first direction may be the longitudinal direction and the second direction may be the short direction. Further, the backlight box 100 may have the same length in the first direction and the second direction.

  The first side wall 110 is configured by bending the edge of the reflective film 101 into an L shape so as to rise from the bottom wall 102. The L shape means, for example, that the edge of the reflective film 101 in the horizontal direction (XY direction) in the backlight box 100 is directed upward (Z-axis positive direction) in the backlight box 100. It is a bent shape. Further, when the reflection film 101 is bent in an L shape, the end surface of the reflection film 101 is directed upward (Z-axis positive direction), and the end surface is configured as the upper end surface of the first side wall portion 110. The That is, in this specification, the L-shape indicates a state where the edge of the reflective film 101 is bent once, and the edge of the reflective film 101 is bent twice (like the second side wall 120). The configuration described in detail later is not included in the L shape. Thus, by bending the edge of the reflective film 101 in an L shape, the first side wall 110 is the long side on both sides of the bottom wall 102 facing the first direction (X-axis direction). Configured to stand up from the department. The first side wall part 110 is formed over the entire region of the long side part of the bottom wall part 102. The first side wall part 110 is substantially perpendicular to the bottom wall part 102. The rising surfaces 110a of the pair of first side wall portions 110 are surfaces that extend in the YZ direction and face each other in parallel.

  The second side wall 120 includes at least a mounting surface 122a on which the liquid crystal panel 700 is mounted. The mounting surface 122a is configured to be wider than at least the end surface 110b of the reflective film 101. Specifically, the second side wall portion 120 includes a rising portion 121 and a first piece portion 122. The rising portion 121 is configured by bending the edge of the reflective film 101 so as to rise from the bottom wall portion 102. The first piece portion 122 is configured by bending the upper end portion of the rising portion 121. The first piece 122 is configured to face the bottom wall 102, and the placement surface 122 a is formed by the first piece 122.

  The rising portion 121 is configured to rise from the short side portions on both sides of the bottom wall portion 102 facing the second direction (Y-axis direction) by bending the edge portion of the bottom wall portion 102. The rising portion 121 may be formed over the entire region of the short side portion of the bottom wall portion 102. The rising portion 121 is substantially perpendicular to the bottom wall portion 102. The rising surfaces 121a of the rising portions 121 of the pair of second side wall portions 120 are surfaces that extend in the XZ direction and face each other in parallel.

  The first piece 122 is configured to extend to the inside of the box from the rising part 121 by bending the upper end of the rising part 121 to the inside of the box. In the example shown in FIG. 2, the first piece 122 is formed over the entire region in the X-axis direction of the upper end portion of the rising portion 121. However, the first piece 122 may not be formed in the entire region of the upper end portion of the rising portion 121 in the X-axis direction, and may be formed in a partial region. The first piece 122 is substantially perpendicular to the rising portion 121. Thus, the first piece 122 extends in the XY direction and faces the bottom wall 102 substantially in parallel. Further, the placement surface 122 a is formed by the upper surface of the first piece 122. Thus, the mounting surface 122a can be formed by forming the first piece 122 by bending the reflective film 101 twice.

  The first piece 122 is provided such that its position is lower than the upper end of the first side wall 110 in the height direction of the backlight box 100 (Z-axis positive direction). Here, as described above, the mounting surface 122 a is formed by the first piece 122 configured by bending the upper end portion of the rising portion 121. Therefore, for example, if the height of the rising portion 121 before being bent is set to be equal to or lower than the height of the first side wall portion 110, the first piece is at least as much as the upper end portion of the rising portion 121 is bent. The part 122 can be made lower than the first side wall part 110.

  Next, functions and effects of the backlight box 100 will be described. As shown in FIG. 1, the backlight 10 can be accommodated in the backlight box 100. Further, as shown in FIG. 2B, a liquid crystal panel 700 can be placed on the backlight box 100. Specifically, the liquid crystal panel 700 can be mounted on the backlight box 100 by supporting the end portion of the liquid crystal panel 700 in the second direction by the mounting surface 122a. Thus, by using the backlight box 100 and disposing the backlight 10 on the back surface of the liquid crystal panel 700, the liquid crystal display 1 (FIG. 1) can be configured. In FIG. 2B, illustration of the backlight accommodated in the backlight box 100 is omitted.

  Here, for example, as in Patent Document 1, when a holder having a concave shape is used as a member for constituting a liquid crystal display, the thickness of the wall portion of the backlight box (for example, the holder is made of plastic). In this case, the area of the non-display portion of the electronic device to which the liquid crystal display is applied is increased by about 0.5 mm. On the other hand, as in the present embodiment, the backlight box 100 is constituted by the reflective film 101, and the edge of the reflective film 101 is L-shaped so that the first side wall portion 110 rises from the bottom wall portion 102. In the first direction (X-axis direction), the thickness of the non-display area of the electronic device to which the liquid crystal display 1 is applied is set to the thickness of the reflective film 101 (the end face 110b in FIG. 2). ). Specifically, for example, as described above, by setting the thickness of the reflective film 101 to about 10 to 300 μm, the thickness is set to about 2 to 60% compared to the case where a plastic holder having a thickness of 0.5 mm is used. Can be made smaller. Therefore, the area of the non-display portion of the electronic device can be reduced.

  Further, if the backlight box 100 is constituted by the reflective film 101, for example, it is not necessary to separately use a plastic holder. Therefore, the assembly work of the liquid crystal display can be simplified and the cost can be reduced.

  On the other hand, the 2nd side wall part 120 has the mounting surface 122a comprised wider than the end surface 110b of a reflecting film. Therefore, it is possible to configure the liquid crystal display by sufficiently supporting the liquid crystal panel 700 by the mounting surface 122a while reducing the non-display area of the electronic device in the first direction (X-axis direction).

  Furthermore, since the position of the first piece portion 122 (mounting surface 122a) is lower than the first side wall portion 110, the liquid crystal panel 700 mounted on the mounting surface 122a in the assembly operation of the liquid crystal display is at least A part thereof is disposed at a position lower than the first side wall portion 110. Therefore, the liquid crystal panel 700 is positioned by being sandwiched by the rising surfaces 110a of the first side wall portion 110 in the first direction (X-axis direction). Therefore, the liquid crystal panel 700 can be easily positioned and placed on the backlight box 100.

  Specifically, for example, as shown in FIG. 3A, the liquid crystal panel 700 is slid in the second direction from substantially the same height as the backlight box 100, so that the backlight box 100 is Can be placed. As described above, the liquid crystal panel 700 is positioned by the first side wall portion 110 in the first direction (X-axis direction). Therefore, the positioning of the liquid crystal panel 700 can be completed simply by adjusting the slide amount and positioning the liquid crystal panel 700 in the second direction (Y-axis direction). In this way, the liquid crystal display 1 (FIG. 1) can be easily assembled.

  As shown in FIG. 3B, the liquid crystal panel 700 can be placed on the backlight box 100 from above the backlight box 100. In that case, for example, after the liquid crystal panel 700 is placed, the positioning of the liquid crystal panel 700 can be completed only by sliding in the second direction (Y-axis direction) if necessary.

  By the way, in the liquid crystal display assembled by the backlight box 100 having the mounting surface 122a, the non-display area in the second direction (Y-axis direction) is the non-display area in the first direction (X-axis direction). Bigger than. Here, in an electronic device such as a smartphone, for example, in the upper and lower frame portions of the display unit, a non-display area is provided in order to arrange components such as operation keys, a speaker, and a microphone. Therefore, the liquid crystal display may be mounted on a smartphone or the like so that the mounting surface 122a of the liquid crystal display assembled by the backlight box 100 is positioned at the frame portion where such components are arranged. Thereby, the influence of the increase in the non-display area by the mounting surface 122a can be made relatively small. On the other hand, since the non-display area can be reduced at the left and right edges of the display unit of the smartphone, a narrow frame can be obtained.

[Second Embodiment]
FIG. 4 is a diagram showing a backlight box according to the second embodiment. FIG. 4A is a perspective view of the backlight box, and FIG. 4B is a perspective view showing a state in which the liquid crystal panel is placed on the backlight box.

In the second embodiment, the second side wall portion 120A includes a rising portion 121A and a third piece portion 122A (in the fourth embodiment (FIG. 8) described later, a second piece is provided. Part included). The rising portion 121A is configured by bending the edge portion of the reflective film 101A so as to rise from the bottom wall portion 102. The third piece 122A is configured by bending a part of the rising portion 121A in the first direction (X-axis direction) to the inside of the box. The mounting surface 122Aa is formed by the third piece 122A. Thus, the mounting surface 122Aa can also be formed by bending the reflective film 101A to form the third piece 122A.

  In the example shown in FIG. 4, the second side wall 120A is configured to have, for example, a side surface 120Aa. The side surface 120Aa is formed by the edge of the surface of the reflective film 101A in the second direction (Y-axis direction).

  The rising portion 121A of the second side wall portion 120A is configured to have a rising surface 121Aa. The rising surface 121Aa is substantially perpendicular to the bottom surface 102a at the short side portion of the bottom surface 102a in the second direction.

  The third piece 122A of the second side wall 120A is configured to have a placement surface 122Aa. The mounting surface 122Aa is provided so as to be substantially parallel to the bottom surface 102a. As for mounting surface 122Aa, the back surface opposes the bottom surface 102a. The third piece 122A is provided such that its position is lower than the upper end of the first side wall 110.

  In the example shown in FIG. 4 (a), the third piece 122A has two notches in the rising portion 121A from the upper end to the lower side at a predetermined interval, and the portion sandwiched between the two notches is used for the backlight. It is formed by bending inward of the box body 100A.

  In the example shown in the figure, three third piece portions 122A are provided for each of the second side wall portions 120A, but the number of third piece portions 122A is not particularly limited. Absent. The number of the third pieces 122A may be any number that can sufficiently support the liquid crystal panel 700.

  According to the backlight box 100A according to the second embodiment, the third piece 122A bends a part of the rising portion 121A in the first direction (X-axis direction) to the inside of the box. It is composed by letting. A portion of the rising portion 121A that is not bent constitutes a portion that is located higher than the third piece portion 122A (mounting surface 122Aa). In the assembly operation of the liquid crystal display, the liquid crystal panel 700 placed on the placement surface 122Aa is not bent in the rising portion 121A in the second direction (Y-axis direction) as shown in FIG. 4B. Between the two. Thereby, the liquid crystal panel 700 can be positioned also in the second direction (Y-axis direction). For this reason, since positioning can be completed only by mounting the liquid crystal panel 700 on the backlight box 100A, the liquid crystal display can be easily assembled.

  Moreover, you may employ | adopt the structure shown in FIG. 5 as a modification of the box for backlights concerning 2nd Embodiment.

  In the example shown in FIG. 5 (a), the third piece 122B of the backlight box 100B has a U-shaped cut in the rising portion 121B, leaving the entire upper end, and the cut is made. It is formed by bending the portion to the inside of the backlight box 100B. The shape of the cut (the shape of the third piece 122B) is not particularly limited as long as the function of the placement surface 122Ba can be obtained. With such a backlight box 100B, as shown in FIG. 5B, positioning can be completed simply by placing the liquid crystal panel 700 on the backlight box 100B.

[Third Embodiment]
FIG. 6 is a diagram showing a backlight box according to the third embodiment.

  In the third embodiment, the second side wall portion is configured by disposing the frame body 120 </ b> C at the edge portion of the bottom wall portion 102. A mounting surface 122Ca is formed at the upper end of the frame body 120C.

  As shown in FIG. 6, the frame body 120C has a thickness larger than the thickness of the reflective film 101C (the width of the end surface 110b). For this reason, the frame body 120C is superior in strength to the reflective film 101C, for example. The material of the frame body 120C is not particularly limited, but for example, a plastic material can be used.

  The frame body 120C is configured to include a rising portion 121C having a rising surface 121Ca and an upper end portion 122C having a placement surface 122Ca. Each rising surface 121Ca of the frame body 120C constituting the pair of second side wall portions extends in the XZ direction and becomes a surface facing each other in parallel. The mounting surface 122Ca is formed by the upper end portion of the frame body 120C. For this reason, the width of the mounting surface 122Ca is the same as the thickness of the frame body 120C. As described above, since the thickness of the frame body 120C is larger than the thickness of the reflective film 101C, by forming the mounting surface 122Ca by the upper end portion of the frame body 120C, similarly to the first embodiment and the second embodiment, The mounting surface 122Ca can be configured wider than the end surface 110b of the reflective film 101C.

  The light source 200 is accommodated in the backlight box 100C. For example, an FPC 210 (FPC: Flexible Printed Circuit) is connected to the light source 200. Through the FPC 210, power, control signals, and the like are sent to the light source 200 such as an LED. In the example shown in FIG. 6, the FPC 210 is accommodated in the backlight box 100 </ b> C together with the light source 200.

  The light source 200 and the FPC 210 are fixed to the frame body 120C. Although the fixing method is not particularly limited, for example, various adhesive materials can be used.

  According to the third embodiment, the light source 200 and the FPC 210 can be fixed to the frame body 120C and accommodated in the backlight box 200C. As described above, since the frame body 120C is superior in strength to the reflective film 101C, for example, the light source 200 and the FPC 210 can be stably fixed.

  Next, an example of the configuration of the corners of the backlight box will be described with reference to FIG. This configuration can be commonly used in each embodiment. In FIG. 7, as an example, a corner portion of the backlight box 100 in FIG. 2A, that is, a connection portion between the first side wall portion 110 and the second side wall portion 120 is enlarged and illustrated. . In FIG. 7, illustration of the rising portion 121 (FIG. 2) and the like of the second side wall portion 120 is omitted.

  In the example shown in FIG. 7, the first side wall portion 110 extends to the second side wall portion 120 side, and the extended portion is outside the second side wall portion 120 (outside of the backlight box). The first side wall portion 110 is further bent so as to overlap. Thereby, the 1st side wall part 110 and the 2nd side wall part 120 can be connected without gap. Note that the relationship between the first sidewall portion 110 and the second sidewall portion 120 may be reversed. That is, the second side wall 120 is further bent so that the second side wall 120 extends toward the first side wall 110 and the extended portion overlaps the outside of the first side wall 110. May be.

  In the third embodiment, a hot melt layer 140 that can be welded by applying heat is formed on the reflective film 101 (FIG. 2).

  Specifically, in the example illustrated in FIG. 7, the hot melt layer 140 is formed on the outer surfaces of the first sidewall 110 and the second sidewall 120 in the reflective film 101 (FIG. 2). The hot melt layer 140 is preferably black. In order to form the black hot melt layer 140, for example, black hot melt may be applied to the outside of the first side wall part 110 and the second side wall part 120. In the case where a transparent or white hot melt that is not black, for example, is used, the hot melt may be applied after a black coating is applied to the outside of the first side wall part 110 and the second side wall part 120.

  Thus, by forming the hot melt layer 140 on the reflective film 101 (FIG. 1), the first side wall portion 110 and the second side wall portion 120 can be formed by the bonding function of the hot melt layer 140 only by performing a heat treatment. Can be glued. Therefore, it becomes easy to manufacture the backlight box.

  Further, by making the hot melt layer 140 black, leakage of the backlight to the outside of the backlight box can be reduced.

[Fourth Embodiment]
FIG. 8 is a diagram showing a backlight box according to the fourth embodiment. FIG. 8A is a perspective view of the backlight box, FIG. 8B is a cross-sectional view taken along line AA shown in FIG. 8A, and FIG. FIG. 9 is a cross-sectional view taken along the line BB shown in FIG.

  In 4th Embodiment, one (120D) is further equipped with the 2nd piece part 123 among a pair of 2nd side wall parts (120,120D). The second piece 123 is configured by bending the inner edge of the first piece 122 toward the bottom wall 102. In a space surrounded by the rising part 121, the first piece part 122, and the second piece part 123, a light emitting part (light source 200) that emits light to the inside of the box is arranged. The second piece 123 opens so that the light emitting part is exposed at a position facing the light emitting part, and closes the space at other positions.

  In the example shown in FIG. 8, the second piece 123 is configured to have a protective surface 123a, for example. The protective surface 123a is formed by the edge of the surface of the reflective film 101D (here, the surface opposite to the bottom surface 102a). The protective surface 123a faces the rising surface 121a so that the back surface of the protective surface 123a sandwiches the light source 200 together with the rising surface 121a, and covers the light source 200. A portion of the second piece 123 without the protective surface 123a is opened. The light source 200 is exposed in the opened portion.

  Here, as described above with reference to FIG. 1, the light emitted from the light source 200 is adjusted by the light guide plate 300, the diffusion plate 400, the optical films 500, 600, and the like, and is applied to the back surface of the liquid crystal panel 700. Will be. That is, as shown in FIG. 8B, which is a cross-sectional view including the opening of the second piece 123, the light emitted from the light source 200 passes through the light guide plate 300 and is stacked on the light guide plate 300. Propagating to the diffusion plate 400 and the like (FIG. 1). However, a part of the light emitted from the light source 200 does not immediately propagate to the diffusion plate 400 or the like, but reaches the rising surface 121a on the opposite side across the light guide plate 300 from the light source 200 and is reflected. The light passes through the light guide plate 300 again and returns to the light source 200 side. At this time, when the reflected light reaches, for example, the light source 200 and the FPC 210 (FIG. 6), the light is absorbed there. In particular, the FPC 210 easily absorbs light, for example, when the color is brown or the like. When the light is absorbed, the amount of light applied to the back surface of the liquid crystal panel is reduced accordingly, and thus the brightness of the liquid crystal display, for example, decreases.

  Here, in 4th Embodiment, as shown in FIG.8 (c) which is sectional drawing containing the protective surface 123a of the 2nd piece part 123, the standup | rising which is on the other side on both sides of the light-guide plate 300 from the light source 200 is shown. The light that reaches and reflects the surface 121a reaches the protective surface 123a. As described above, since the protective surface 123a is formed by the edge of the surface of the reflective film 101D, the light reaching the protective surface 123a is reflected with a high reflectance. The light reflected by the protective surface 123a propagates again through the light guide plate 300 and to the diffusion plate 400 and the like (FIG. 1) stacked on the light guide plate 300. Further, some of the light again passes through the light guide plate 300 and is reflected by the rising surface 121a. Such light is also reflected on the light guide plate 300 while being repeatedly reflected between the protective surface 123a and the rising surface 121a. Propagating to the laminated diffusion plate 400 and the like (FIG. 1). Therefore, the light emitted from the light source 200 is irradiated to the liquid crystal panel with almost no absorption (without loss). Thereby, for example, it is possible to prevent the luminance of the liquid crystal display from being lowered.

  DESCRIPTION OF SYMBOLS 100,100A-100C ... Backlight box, 101, 101A-101D ... Reflective film, 122a, 122Aa, 122Ba, 122Ca ... Mounting surface, 102 ... Bottom wall part, 110 ... First side wall part, 120, 120A -120D ... 2nd side wall part, 200 ... Light source.

Claims (7)

A backlight box composed of a reflective film,
A rectangular bottom wall portion constituted by the reflective film;
A pair of first side wall portions standing on the bottom wall portion and facing each other in a first direction;
A pair of second side wall portions standing on the bottom wall portion and facing each other in a second direction,
The pair of first side wall portions is configured by bending an edge portion of the reflective film in an L shape so as to rise from the bottom wall portion,
A pair of said 2nd side wall part is equipped with the mounting surface which mounts at least a liquid crystal panel, and the said mounting surface is a box for backlights comprised wider than the end surface of the said reflection film at least. The second side wall portion is
A rising part configured by bending the edge of the reflective film so as to rise from the bottom wall part;
It is configured by bending an upper end portion of the rising portion, and includes a first piece portion facing the bottom wall portion,
The backlight box according to claim 1, wherein the placement surface is formed by the first piece. One of the pair of second side wall portions is
A second piece configured by bending the inner edge of the first piece into the bottom wall portion;
In the space surrounded by the rising part, the first piece, and the second piece, a light emitting part that emits light to the inside of the box is disposed,
3. The backlight box according to claim 2, wherein the second piece is opened so that the light emitting unit is exposed at a position facing the light emitting unit, and the space is closed at another position. The second side wall portion is
A rising part configured by bending the edge of the reflective film so as to rise from the bottom wall part;
A third piece configured by bending a part of the rising portion in the first direction to the inside of the box, and
The backlight box according to claim 1, wherein the placement surface is formed by the third piece. The second side wall portion is configured by arranging a frame body at an edge of the bottom wall portion,
The backlight box according to claim 1, wherein the mounting surface is formed at an upper end of the frame body.   The said reflective film is a box for backlights as described in any one of Claims 1-5 comprised by laminating | stacking a multilayer film.   The box for backlight according to any one of claims 1 to 6, wherein a hot melt layer that can be welded by applying heat is formed on the reflective film.