JP2013178970A - Light source unit, method of manufacturing light source unit, and liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit capable of suppressing luminance unevenness and, moreover, capable of fixing a light source at a prescribed position with high accuracy.SOLUTION: A light source unit 2 is composed of a light source substrate 11, a light source substrate-holding member 12, and a light source substrate fixing member 14. The light source substrate 11 is provided with coupling parts 11c, 11d capable of coupling light source substrates 11, and notched parts 11a, 11b on one lengthwise side of each light source substrate 11. The light source substrate-holding member 12 includes openings 12a, 12b, and the notched parts 11a, 11b and the openings 12a, 12b are fixed by the light source substrate-fixing member 14 in a state at least partly overlapped with each other.

Description

  The present invention relates to a light source unit, a method for manufacturing the light source unit, and a liquid crystal display device including the light source unit. The light source unit includes, for example, a backlight of a liquid crystal display device, an indoor or outdoor illumination device, and the like. Applies to

  In recent years, in the field of liquid crystal display devices, for example, a side edge type (side light) in which light from a light source disposed at an end portion in a longitudinal direction of a light guide plate is emitted in a planar shape by a light guide plate. Backlight is often used.

  In such a side edge type backlight, for example, light sources such as LEDs (Light Emitting Diodes) are arranged at both ends in the longitudinal direction of the light guide plate, and light is incident from each end face in the longitudinal direction of the light guide plate. In addition, a part of the light is totally reflected to the inner center of the light guide plate, and a part of the light is emitted from the light emitting surface of the light guide plate, and the light from the light source is emitted in a planar shape by the light guide plate. .

  In addition, the LED light source used for such a side edge type backlight uses a plurality of LED packages mounted on a single substrate.

  Such a side edge type backlight is also thinned by reducing the thickness of the light guide plate used.

  For example, Patent Document 1 discloses such a side edge type backlight.

  FIG. 11A is a diagram illustrating a schematic configuration of a liquid crystal display device including a conventional side edge type backlight described in Patent Document 1.

  As shown in the figure, main components of the liquid crystal display device 100 are accommodated in a box-shaped frame 101.

  That is, on the frame 101, a liquid crystal panel 102, a condensing film (not shown), a prism film 103, a diffusion plate 104, a light guide plate 105, and a reflection plate 106 are laminated and arranged in this order. ing.

  The reflector 106 is installed in contact with the inner surface of the frame 101.

  Then, the light emitting module 110 is arranged along one side of the light guide plate 105.

  FIG. 11B is a diagram showing a schematic configuration of a light emitting module provided in the conventional side edge type backlight described in Patent Document 1.

  The light emitting module (light source unit) 110 includes a light source substrate 111 and a substrate holding member 112, as shown in FIGS. 11 (a) and 11 (b).

  The actual ratio of the dimensions of each part of the light emitting module 110 is as shown in FIG. 11B, and is a long object whose length is significantly longer than the cross-sectional area.

  The substrate holding member 112 is made by using a metal drawn material such as aluminum or mild steel, or by cutting or bending, and its cross-sectional shape is substantially L-shaped.

  Since the cross-sectional shape of the substrate holding member 112 is substantially L-shaped as described above, it has a total of six surfaces except for the end surface.

  The light source substrate 111 is obtained by printing a wiring on a resin plate 113 and soldering a large number of light emitting diodes 114 arranged in a row thereon. That is, in the liquid crystal display device 100, a large number of light emitting diodes 114 are intensively arranged at predetermined positions on the inner surface of the frame 101.

  The thickness of the resin plate 113 is 1 mm, and the width of the resin plate 113 is slightly smaller than the width of the surface in contact with the resin plate 113 in the substrate holding member 112 as shown in FIG. The entire length of the resin plate 113 is the same as that of the substrate holding member 112.

  The light emitting diode 114 has a regular quadrangular prism shape with a substantially square light emitting surface, and each light emitting surface (surface facing the light guide plate 105) has a size of 4 mm square and a height (in the horizontal direction in FIG. 11A). Length) is 3 mm. In the liquid crystal display device 100, 84 light emitting diodes 114 are arranged in a line and soldered to the resin plate 113.

  The light guide plate 105 is a rectangular plate, and the light emitting module 110 is disposed along one of the long sides of the light guide plate 105. This position is a position that becomes the lower side (or the upper side) of the liquid crystal display device 100. The light emitting module 110 is disposed on at least one of the four sides of the light guide plate 105.

  Then, one surface of the substrate holding member 112 of the light emitting module 110 is fixed to the frame 101 in contact with the inner surface of the back plate portion of the frame 101. 11A, the light emitting module 110 is located along the end surface of one side of the light guide plate 105, and more specifically, the light emitting diode 114 provided in the light emitting module 110. Is close to the end face of one side of the light guide plate 105. A 1 mm gap is provided between the light emitting diode 114 and the light guide plate 105, and a 1 mm gap is also provided between the substrate holding member 112 and the peripheral wall portion of the frame 101.

  Patent Document 2 describes a light emitting module in which a printed circuit board provided with a light source is fixed to an L-shaped chassis using screws.

JP 2011-243554 A (released on December 1, 2011) Special table 2011-525685 gazette (released on September 22, 2011)

  However, in the configuration of the side edge type backlight generally described in Patent Document 1 and the like, it is necessary to accurately arrange the light guide plate and a light source such as an LED in consideration of the thickness of the light guide plate. is there.

  If an error occurs in the assembly process of accurately arranging the light guide plate and the light source at predetermined positions, the light emitted from the light source is not incident on the light guide plate but directly transmitted through the liquid crystal panel. As a result, the display quality of the liquid crystal display device is degraded.

  In the configuration of the side edge type backlight disclosed in Patent Document 1, a mechanism for accurately positioning the light guide plate 105 and the light emitting diode 114, that is, light emission arranged at a predetermined position with respect to the light guide plate 105. In the module 110, there is no mechanism for accurately fixing the light emitting diode 114 at a predetermined position. Therefore, on the display screen of the liquid crystal display device 100 having such a configuration, the emitted light (light leakage) emitted from the light emitting module 110 is directly visually recognized, leading to a reduction in display quality.

  In addition, when trying to further reduce the thickness of the side edge type backlight as disclosed in Patent Document 1, in order to maintain the backlight at a predetermined brightness or higher, the size of the light source ( It is conceivable that the size of the light emitting surface of the light source is constant and only the thickness of the light guide plate is reduced.

  However, in such a configuration, since the arrangement margin of the light source with respect to the light guide plate is reduced as the thickness of the light guide plate is reduced, light leakage occurs more significantly, and the display quality of the liquid crystal display device There is a risk of significantly lowering.

  On the other hand, in the light emitting module disclosed in Patent Document 2 in which a printed circuit board having a light source is fixed to an L-shaped chassis with screws, the printed circuit board has a head portion of the screws. It is necessary to secure the space, and since the light source cannot be arranged at the position where the screw head is arranged, the luminance unevenness is likely to occur. In order to eliminate such luminance unevenness, it is difficult to realize a thin backlight.

  Further, since the resin plate 113 and the printed circuit board described in Patent Documents 1 and 2 are not provided with adjacent resin plates 113 or members for connecting the printed circuit boards, the resin plate 113 or The printed circuit board has a shape that is long in the longitudinal direction, and is unsuitable for highly accurate alignment.

  The present invention has been made in view of the above-described problems, and includes a light source unit that can suppress uneven brightness and can accurately fix a light source at a predetermined position, and a light source unit that can accurately arrange a light source at a predetermined position. It is an object of the present invention to provide a manufacturing method and a thin liquid crystal display device with high display quality.

  In order to solve the above problems, a light source unit of the present invention includes a light emitting element, a light source substrate including the light emitting element, and a holding member having a first surface that holds the light source substrate. The light source substrate is provided with a connecting portion capable of connecting a plurality of light source substrates and a notch portion on one side of the light source substrate on the longitudinal side, and the first surface of the holding member In order to arrange the light emitting element at a predetermined position with respect to the holding member, the first surface of the holding member and the light source substrate are overlapped with each other. When the fixing member provided between the light source substrate and the light source substrate is fixed, at least a part of the opening and the notch overlap each other.

  According to the above configuration, the light source substrate and the holding member provided in the light source unit are each provided with the notch and the opening for arranging the light emitting element at a predetermined position with respect to the holding member. It has been.

  In addition, since the light source substrate is provided with a connecting portion, even when the size of the light source substrate is relatively small, a plurality of the light source substrates are connected using the connecting portion, and the holding member is provided. Can be combined.

  Then, by performing assembly adjustment using the notch and the opening, the opening and the notch are at least partially overlapped, that is, the light emitting element is held by the holding member. Can be fixed in a state of being accurately arranged at a predetermined position.

  According to the above configuration, since the light emitting element is accurately arranged and fixed at a predetermined position with respect to the holding member, another member, for example, a light guide plate is mounted on the holding member. Even when positioning with the light emitting element is performed, the position can be adjusted with high accuracy.

  Further, according to the above configuration, the fixing member that fixes the first surface of the holding member and the light source substrate is provided between the first surface and the light source substrate. There is no restriction on the position where the light emitting element is provided.

  Therefore, according to the said structure, the light source unit which can suppress a brightness nonuniformity and can fix a light source to a predetermined position with high precision is realizable.

  In the light source unit of the present invention, it is preferable that a plurality of the openings and the notches are provided.

  According to the above configuration, since the opening and the notch are each provided in a plurality, the light emitting element is fixed in a state where the light emitting element is accurately arranged at a predetermined position with respect to the holding member. can do.

  Moreover, it can prevent shifting in the oblique direction.

  In the light source unit of the present invention, it is preferable that the holding member is provided with a second surface arranged perpendicular to the first surface, either integrally with the holding member or as a separate body.

  According to the above configuration, for example, a light guide plate can be mounted on the second surface arranged perpendicular to the first surface of the holding member, and alignment with the light emitting element can be performed. The position adjustment with high accuracy is possible.

  In order to solve the above problems, a liquid crystal display device of the present invention includes the light source unit, a light guide having a light emitting surface for emitting light emitted from the light emitting element in the light source unit, and a liquid crystal display panel. It is characterized by having.

  According to the above configuration, a thin liquid crystal display device with high display quality can be realized.

  In order to solve the above problems, a method for manufacturing a light source unit according to the present invention includes: a light emitting element; a light source substrate including the light emitting element; and a holding member having a first surface that holds the light source substrate. A light source unit manufacturing method comprising: an opening formed on a first surface for holding the light source substrate; and a notch formed on one side of the light source substrate on a longitudinal side, with an adjustment pin Using the positioning member provided, the position is adjusted so that at least a part thereof overlaps in plan view.

  According to the above method, the notch portion provided in the light source substrate and the opening portion provided in the holding member are overlapped at least in a plan view using the positioning member provided with the adjustment pin. The position is adjusted.

  Therefore, it is possible to realize a method of manufacturing a light source unit capable of accurately arranging the light emitting element at a predetermined position with respect to the holding member.

  In the method of manufacturing the light source unit of the present invention, the position adjustment is performed by the opening formed on the first surface holding the light source substrate and the notch formed on one side of the long side of the light source substrate. In this state, it is preferable that the light source substrate and the first surface of the holding member are fixed by the fixing member.

  According to the above method, the notch portion provided in the light source substrate and the opening portion provided in the holding member are overlapped at least in a plan view using the positioning member provided with the adjustment pin. It is fixed by the fixing member in the state adjusted to.

  Therefore, it is possible to realize a method of manufacturing a light source unit that can fix the light emitting element to the holding member at a predetermined position with high accuracy.

  As described above, in the light source unit of the present invention, the light source substrate is provided with a connecting portion capable of connecting a plurality of light source substrates, and a cutout portion on one side of the long side of the light source substrate. An opening is provided in the first surface of the holding member, and the first surface of the holding member and the light source substrate are overlapped in order to place the light emitting element at a predetermined position with respect to the holding member. When the fixing member provided between the first surface and the light source substrate is fixed, at least a part of the opening and the notch overlap each other.

  As described above, the liquid crystal display device of the present invention includes the light source unit, a light guide having a light emitting surface for emitting light emitted from the light emitting element in the light source unit, and a liquid crystal display panel. It is the composition which is.

  As described above, the method of manufacturing the light source unit of the present invention includes the opening formed on the first surface that holds the light source substrate and the notch formed on one side of the long side of the light source substrate. This is a method of adjusting the position so that at least a part thereof overlaps in a plan view using a positioning member provided with an adjustment pin.

  Therefore, it is possible to suppress luminance unevenness, and to provide a light source unit that can fix the light source with high accuracy at a predetermined position, and a method of manufacturing the light source unit that can accurately arrange the light source at a predetermined position, and a thin liquid crystal display with high display quality. Device.

It is a figure which shows schematic structure of the liquid crystal display device of one embodiment of this invention provided with the light source unit. It is sectional drawing of the liquid crystal display device of one embodiment of this invention shown in FIG. It is a figure which shows an example of the light source unit with which the liquid crystal display device of one embodiment of this invention was equipped, and is a figure which shows the case where two light source units are connected. It is a figure for demonstrating schematic structure of the light source unit shown in FIG. It is a figure for demonstrating the light source board | substrate of the light source unit with which the liquid crystal display device of one embodiment of this invention was equipped. It is a figure for demonstrating the assembly adjustment method of the light source board | substrate and light source board | substrate holding member in the light source unit with which the liquid crystal display device of one embodiment of this invention was equipped. It is a figure which shows the luminance distribution of the liquid crystal display device provided with the backlight which applied the light source unit produced by applying the assembly adjustment method of FIG. 6 only to the predetermined area | region. It is a figure for demonstrating where the light source unit produced by applying the assembly adjustment method of FIG. 6 can be arrange | positioned in the liquid crystal display device of one embodiment of this invention. It is a perspective view which shows schematic structure of the other light source unit which can be provided in the liquid crystal display device of one embodiment of this invention. It is a figure for demonstrating schematic structure of the light source unit shown in FIG. It is a figure which shows schematic structure of the liquid crystal display device provided with the conventional side edge type | mold backlight described in patent document 1. FIG.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention only, unless otherwise limited, and are merely explanations. It is just an example.

  In the following embodiments, a case where a backlight (illumination device) including a light source unit is applied to a liquid crystal display device will be described as an example. However, the present invention is not limited to this, and a backlight including a light source unit is described. The light (illuminating device) can be applied to, for example, an indoor or outdoor lighting device.

[Embodiment 1]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
(Overall configuration of the liquid crystal display device 1)
FIG. 1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device 1 according to an embodiment of the present invention including a backlight 9 including a light source unit 2.

  As shown in the figure, the liquid crystal display device 1 includes a backlight 9 including a light source unit 2, an optical sheet 10 (for example, a configuration of a diffusion sheet, a prism sheet, and a diffusion sheet), a resin frame 3, and a liquid crystal display. The panel 4 and the bezel 5 are arranged so as to overlap in this order.

  In the liquid crystal display device 1, the light emitted from the backlight 9 passes through the optical sheet 10 and enters the liquid crystal display panel 4. The liquid crystal display panel 4 changes the light transmittance for each pixel and displays a desired image.

  The liquid crystal display panel 4 has a rectangular flat plate shape, and the optical sheet 10 has substantially the same shape as the liquid crystal display panel 4. Here, the direction parallel to the long side of the liquid crystal display panel 4 is the X direction, the direction parallel to the short side of the liquid crystal display panel 4 is the Y direction, and the direction perpendicular to both the X direction and the Y direction is the Z direction. To do.

  The X direction is also the longitudinal direction, and the Z direction can be said to be the normal direction of the liquid crystal display panel 4.

The resin frame 3 is used for holding and positioning the liquid crystal display panel 4, and the resin frame 3 may be configured to press the optical sheet 10 in the Z direction.
(Configuration of the backlight 9)
Hereinafter, the configuration of the backlight 9 will be described with reference to FIGS. 1 and 2.

  As illustrated in FIG. 1, the backlight 9 is provided in the opening 6 a of the chassis 6 and the chassis 6 having the opening 6 a in order from the bottom, that is, in order from the side far from the liquid crystal display panel 4. The light source unit 2, the reflection sheet 7, and the light guide plate 8 as an optical member are overlapped.

  The chassis 6 is formed of a material such as iron, for example, and is for increasing the strength of the backlight 9. The chassis 6 is formed in a rectangular shape having substantially the same size as the liquid crystal display panel 4.

  Specifically, the light source unit 2 to be described later is disposed in a recess that is an elongated shape extending in the X direction, that is, a belt-like groove, in the opening 6 a of the chassis 6.

  The reflection sheet 7 is provided to reflect the light leaking from the light guide plate 8 and return it to the light guide plate 8.

  The light guide plate 8 is for guiding light incident from the light source unit 2 side to the liquid crystal display panel 4 side, and has a flat plate shape.

  FIG. 2 is a cross-sectional view showing the vicinity of the light source unit 2 of the liquid crystal display device 1 according to the embodiment of the present invention.

  As shown in the drawing, the position of the reflection sheet 7 and the light guide plate 8 relative to the light source substrate 11 provided in the light source unit 2 and the position in the Z direction are determined by the positioning member 13.

In the present embodiment, the positioning member 13 is a separate member from the light source substrate holding member 12 provided in the light source unit 2 described later in detail, but may be formed integrally.
(Configuration of light source unit 2)
Hereinafter, the configuration of the light source unit 2 will be described with reference to FIGS. 3, 4, and 5.

  FIG. 3 is a diagram illustrating an example of the light source unit 2 provided in the liquid crystal display device 1 according to the embodiment of the present invention.

  As shown in the drawing, the light source unit 2 provided in the liquid crystal display device 1 according to the embodiment of the present invention includes two elongated light source substrates 11 extending in the X direction and two light source substrate holding members. 12 are connected to each other, but the present invention is not limited to this, and the length of the light source substrate 11 in the X direction can be appropriately set according to the size of the light source unit to be manufactured. One or a plurality of light source substrates 11 can be used. Further, the length of the light source substrate holding member 12 in the X direction can also be set as appropriate, and one or a plurality of light source substrate holding members 12 can be used in combination with the light source substrate 11.

  As illustrated, the light source unit 2 includes a light source substrate 11 including a light source 15, a light source substrate holding member 12, and a light source substrate fixing member 14 for fixing the light source substrate 11 and the light source substrate holding member 12. It consists of

  More specifically, the light source substrate 11 including the light source 15 and the surface of the light source substrate holding member 12 that holds the light source substrate 11 are the surface of the light source substrate 11 and the light source substrate holding member 12 that holds the light source substrate 11. It is fixed by a light source substrate fixing member 14 provided between them.

  The light source substrate 11 and the light source substrate holding member 12 are fixed with high accuracy with respect to the reference surface 12s of the light source substrate holding member 12.

  Hereinafter, based on FIG. 4, the mechanism of the light source unit 2 that can fix the light source substrate 11 and the light source substrate holding member 12 with high accuracy will be described.

  FIG. 4 is a diagram for explaining a schematic configuration of the light source unit 2 shown in FIG. 3 in which the light source substrate 11 and the light source substrate holding member 12 are fixed with high accuracy.

  4A is a view of the light source unit 2 shown in FIG. 3 viewed from the X direction in FIG. 3, and FIG. 4B is a view of the light source unit 2 shown in FIG. 3 viewed from the Y direction in FIG. FIG. FIG. 4C is a view of the light source unit 2 shown in FIG. 3 as viewed from the Y direction in FIG. 3 with the light source substrate 11 and the positioning member 13 removed.

  As shown in FIG. 4A, in the light source unit 2, the light source substrate 11 and the surface of the L-shaped light source substrate holding member 12 that holds the light source substrate 11 include the light source substrate fixing member 14. Thus, the light source substrate holding member 12 is fixed to the reference surface 12s with high accuracy.

  In the light source unit 2, the reference surface 12 s of the light source substrate holding member 12 is arranged perpendicular to the surface of the light source substrate holding member 12 that holds the light source substrate 11.

  As shown in FIG. 4B, two notches 11a and 11b are formed on the lower side of the light source substrate 11 provided with the light source 15, while the light source substrate holding member 12 includes As shown in FIG. 4C, two openings 12a and 12b used for adjustment are formed.

  Then, in order to place the light source 15 at a predetermined position with respect to the light source substrate holding member 12, the surface of the light source substrate holding member 12 that holds the light source substrate 11 and the light source substrate 11 are overlapped and fixed by the light source substrate fixing member 14. When this is done, as shown in FIG. 4B, each of the two notches 11a and 11b and each of the two openings 12a and 12b are completely overlapped. ing.

  In the present embodiment, each of the two notches 11a and 11b and each of the two openings 12a and 12b are completely overlapped, but the present invention is not limited to this. Even when each of the two notches 11a and 11b and each of the two openings 12a and 12b are at least partially overlapped, the light source substrate 11 and the light source substrate holding member 12 are connected by the assembly adjustment method described later. The light source substrate holding member 12 can be accurately fixed to the reference surface 12s.

  In the present embodiment, since a plurality of openings and notches are used, the light emitting element can be fixed in a state where it is accurately arranged at a predetermined position with respect to the holding member. . Moreover, it can prevent shifting in the oblique direction.

  The position, number, and shape of the opening and the position, number, and shape of the notch are appropriately determined by an assembly adjustment method that will be described later.

  The light source substrate holding member 12 is desirably made of a material having high thermal conductivity. This is to efficiently diffuse the heat generated by the light source substrate 11. For example, the material may be aluminum A1050 or the like, and if the thermal conductivity is 100 W / (m · K) or more, sufficient heat dissipation is possible.

The light source substrate fixing member 14 is preferably made of a material having high thermal conductivity in order to efficiently conduct heat from the light source substrate 11 to the light source substrate holding member 12. In order to fix the light source substrate 11 to the light source substrate holding member 12, the light source substrate fixing member 14 desirably has adhesiveness on both surfaces, for example, a thermal conductivity of 1 W / (m · K) or more. A double-sided adhesive tape may be used.
(Configuration of light source substrate 11)
Hereinafter, the light source substrate 11 including the light source 15 will be further described with reference to FIG.

  FIG. 5 is a diagram for explaining the light source substrate 11 including the light source 15.

  As shown in FIG. 5A, the light source substrate 11 including the light source 15 is provided with notches 11a and 11b on the lower side and connecting portions 11c and 11d on the left and right ends, respectively. .

  In the present embodiment, an LED chip that is a point light source is used as the light source 15, and the number and the light emission efficiency thereof are appropriately selected according to the specifications of the backlight 9.

  As the light source 15, a light source 15 in which a plurality of LED chips are packaged or a linear light source such as CCFL can be used.

  As shown in FIG. 5A, the light source substrate 11 is provided with a plurality of light sources 15, so that the specification of the backlight 9 is satisfied. The plurality of light sources 15 are desirably arranged at the same interval, and by making the intervals constant, it is possible to reduce luminance unevenness that occurs between the light sources.

  The light source substrate 11 is preferably made of a material having high heat resistance. This is because the light source 15 such as an LED chip generates heat, so that when it is made of a material having low heat resistance, the resin is deformed and the strength and the like are lowered. Therefore, as the light source substrate 11, for example, a liquid crystal polymer resin or a polyamide resin that is a resin material may be used.

  Note that the connecting portions 11 c and 11 d provided at the left and right ends of the light source substrate 11 illustrated in FIG. 5B are used to connect the plurality of light source substrates 11.

  In the present embodiment, the light source substrate 11 is connected as connecting portions 11c and 11d for connecting a plurality of adjacent light source substrates 11 along the longitudinal direction (X direction in the drawing) of the light source substrate 11. In order to bring the electrodes (wirings) that supply current to the light source 15 into contact with each other, step portions that can overlap the ends of the adjacent light source substrates 11 in plan view are provided on the left and right ends of the light source substrate 11. However, the shape is not particularly limited as long as a plurality of adjacent light source substrates 11 can be connected.

  Also, when the electrodes that supply current to the light source 15 are brought into contact with each other when the light source substrate 11 is connected, a shape other than the stepped portion shape may be used as long as the electrodes can be brought into contact with each other.

And when the backlight 9 is comprised, the connection parts 11c * 11d located in the leftmost end and the rightmost end are used in order to connect with an external power supply.
(Assembly adjustment method of light source substrate 11 and light source substrate holding member 12)
Hereinafter, an assembly adjustment method (a light source unit manufacturing method) between the light source substrate 11 and the light source substrate holding member 12 will be described with reference to FIG.

  FIG. 6 is a view for explaining an assembly adjustment method of the light source substrate 11 and the light source substrate holding member 12.

  6A shows the positional relationship when the light source substrate 11 is fixed to the light source substrate holding member 12 using the assembly adjustment jig 16 including the first adjustment pin 16b and the second adjustment pin 16c. It is an example to show.

  FIG. 6B is a front view of the vicinity of the first adjustment pin 16 b provided in the assembly adjustment jig 16 as viewed from the direction of the light source substrate 11.

  As shown in FIG. 6A, the assembly adjustment jig 16 includes a jig base 16a, a first adjustment pin 16b, and a second adjustment pin 16c. The first adjustment pin 16 b and the second adjustment pin 16 c are provided at positions that coincide with the openings 12 a and 12 b of the light source substrate holding member 12.

  First, the light source substrate holding member 12 is mounted on the jig base 16 a of the assembly adjustment jig 16. At this time, the first adjustment pin 16b is aligned with the position matching the opening 12a on the left side in the figure, and the second adjustment pin 16c is aligned with the position corresponding to the opening 12b on the right side in the figure. The light source board holding member 12 is held by the assembly adjustment jig 16 so that the respective adjustment pins 16b and 16c are inserted into the respective openings 12a and 12b.

  The first adjustment pin 16b and the second adjustment pin 16c have a smaller outer shape than the openings 12a and 12b and are longer than the thickness of the surface of the light source substrate holding member 12 where the openings 12a and 12b are formed. ing.

  This is because the first adjustment pin 16b and the second adjustment pin 16c are held by the light source substrate when the jig base 16a and the bottom surface and side surface of the light source substrate holding member 12 are held in close contact during adjustment. This is because the member 12 protrudes through the openings 12a and 12b in the surface direction to which the light source substrate 11 is fixed.

  Thereby, the notches 11a and 11b provided on the light source substrate 11 can be brought into contact with the first adjustment pin 16b and the second adjustment pin 16c.

  Then, after holding the light source substrate holding member 12, the light source substrate 11 is held such that the notches 11a and 11b of the light source substrate 11 are in contact with the first adjustment pin 16b and the second adjustment pin 16c. The substrate 11 and the light source substrate holding member 12 are closely attached and fixed.

  At this time, the light source substrate fixing member 14 is desirably provided in advance on the light source substrate 11 and / or the light source substrate holding member 12. In the present embodiment, the light source substrate fixing member 14 is provided on the light source substrate holding member 12 side.

  By using such an assembly adjustment method, the light source substrate 11 is fixed to the reference surface, which is the lower surface of the jig base 16a provided in the assembly adjustment jig 16, by managing a certain distance. In the liquid crystal display device 1, display quality can be managed.

  That is, by managing the distance D shown in FIG. 6B (the distance from the reference plane to the center of the light source 15 provided on the light source substrate 11), the center of the light source 15 and the light guide plate (not shown). ) With respect to the center can be accurately adjusted. By adjusting in this way, in the liquid crystal display device 1, the light emitted from the light source 15 is directly visually recognized (leakage light that is not incident on the light guide plate out of the light emitted from the light source 15). Therefore, the display quality of the liquid crystal display device 1 can be improved.

  In the present embodiment, at the time of assembly adjustment of one light source substrate 11 and one light source substrate holding member 12, two adjustment pins 16b and 16c, two openings 12a and 12b, The two notches 11a and 11b are used, but the present invention is not limited to this, and an adjustment pin, an opening, and an opening required for assembly adjustment depending on the shape of the light source substrate 11 and the light source substrate holding member 12 are used. The number of notches is different.

  In the present embodiment, assembly adjustment is performed by arranging the adjustment pin and the notch so as to contact each other, and the distance D shown in FIG. 6B is the jig base 16a before adjustment. The distance between the reference surface, which is the lower surface, and the adjustment pin is managed. And about the X direction in FIG.6 (b), it carries out by making an adjustment pin and a notch part contact.

  Then, in the present embodiment, the width of the notch 11b corresponding to the second adjustment pin 16c is formed larger than the outer shape of the second adjustment pin 16c. That is, in the present embodiment, the first adjustment pin 16b and the second adjustment pin 16c are formed in the same shape and the same size, and the size of the notch 11b is larger than the size of the notch 11a. Is formed to be large.

  By adopting such a configuration, the light source substrate 11 is prevented from being restricted by both the first adjustment pin 16b and the second adjustment pin 16c.

  In the assembly adjustment jig 16, the distance between the first adjustment pin 16b and the second adjustment pin 16c from the reference surface, which is the lower surface of the jig base 16a, is adjusted to be constant. Thereby, since the light source substrate 11 is prevented from inclining with respect to the reference plane, it is possible to reduce luminance unevenness in the liquid crystal display device 1.

When the light source substrate 11 is tilted with respect to the reference plane, a position shift occurs at the center of the light source substrate 11 with respect to the center of the light guide plate, that is, at the center of the light source 15, and the light guide plate is caused by the error amount. Since the amount of light incident on the liquid crystal changes, luminance unevenness occurs in the liquid crystal display device 1 and the display quality deteriorates.
(Measurement results using a liquid crystal display)
FIG. 7 is a diagram showing a luminance distribution of a liquid crystal display device 1a having a backlight in which the light source unit 2 manufactured by applying the adjustment method described above is applied only to a predetermined region.

  In the liquid crystal display device 1a illustrated in FIG. 7, eight light source units are connected and used, and among the regions (3) to (6) in FIG. 7, the adjustment method described above is used. The light source unit 2 manufactured by application is used. On the other hand, the region (1), the region (2), the region (7), and the region (8) are manufactured without applying the adjustment method described above. A light source unit is used.

  Below the liquid crystal display device 1a in FIG. 7, the luminance distribution in the section AA in the vicinity of the light source of the liquid crystal display device 1a is shown.

  Regions (1) to (8) shown in the figure indicate the relationship between the mounted light source unit and the luminance distribution at the corresponding location.

  Region (3) to region (6) are places where the light source unit 2 manufactured by applying the adjustment method described above is mounted. Region (1), region (2), region (7), and region ( 8) is a place where a light source unit manufactured without applying the adjustment method described above is mounted.

  As is clear from the figure, the luminance distribution in the regions (3) to (6) is within a variation range of ± 6%, and there is no problem in the display quality.

  On the other hand, in the region (1), the region (2), the region (7), and the region (8), the luminance distribution has a variation range of ± 16.5%, and the region (3) to the region ( It can be seen that the display quality is remarkably deteriorated as compared with 6).

From such a result, the light source unit 2 manufactured by applying the adjustment method described above, that is, the light source unit in which the notch portion of the light source substrate and the opening portion of the light source substrate holding member are at least partially overlapped and fixed. Since the light source substrate and the light source substrate holding member can be accurately fixed with respect to the reference surface of the light source substrate holding member, direct light from the light source of the light source unit is emitted onto the screen of the liquid crystal display device. Therefore, a liquid crystal display device having good display quality can be realized.
(Application to liquid crystal display devices)
FIG. 8 is a diagram for explaining at which position of the liquid crystal display device 1 according to an embodiment of the present invention the light source unit 2 manufactured by applying the above-described adjustment method.

  FIG. 8A is a diagram illustrating the liquid crystal display device 1 according to an embodiment of the present invention. FIG. 8B is a diagram illustrating the light source unit 2 arranged in the X direction of the liquid crystal display device 1. It is a figure which shows a case.

  As shown in FIG. 8B, when the light source unit 2 is arranged and used in the X direction of the liquid crystal display device 1, a light guide plate (not shown) having a large size in both the X direction and the Y direction. ) Can be used, and the area of the light guide plate is increased in response to the increase in the area of the liquid crystal display panel of the liquid crystal display device 1 to realize a backlight suitable for practical use of the liquid crystal display device 1 having a large screen. Can do.

  On the other hand, as shown in FIG. 8C, it is also possible to use the light source units 2 manufactured by applying the adjustment method described above, arranged side by side in the Y direction in FIG.

  FIG. 8 illustrates the case where the size of the liquid crystal display panel is 60 type, but is not limited to this, for example, 60 type such as 70 type having a size of 60 type or more. Different dimensions may be used.

  The light source unit 2 shown in FIG. 8B uses, for example, eight light source substrate holding members 12 having a length of 166 mm, a width of 170 mm, and a thickness of 2 mm. , 8 sets of light source substrates 11 are connected to form the light source unit 2 and a large light guide plate is fixed thereon. By doing in this way, it becomes possible to comprise the liquid crystal display device 1 provided with the backlight which illuminates the liquid crystal display panel from the back.

  In the present embodiment, the backlight including the light source unit 2 manufactured by applying the above-described adjustment method is applied to the liquid crystal display device 1. However, the present invention is not necessarily limited thereto, and the above-described adjustment method is applied. The backlight including the manufactured light source unit 2 can be applied to, for example, an indoor or outdoor lighting device. That is, the backlight including the light source unit 2 manufactured by applying the above-described adjustment method of the present embodiment can be applied to a large planar light source as it is. In addition, since no member is required around the light guide plate, it can be applied to a larger planar light source by arranging them seamlessly.

[Embodiment 2]
Next, based on FIG. 9 and FIG. 10, a second embodiment of the present invention will be described. The light source substrate holding member provided in the light source unit 20 of the present embodiment is implemented in that the light source substrate holding member 21 and the second light source substrate holding member 22 are separate members. This is different from the light source unit 2 used in the first embodiment, and the other configurations are the same as described in the first embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 9 is a perspective view illustrating a schematic configuration of the light source unit 20.

  As shown in the drawing, two light source substrates 11 each having a light source 15 are connected to the light source unit 20, and two first light source substrate holding members 21 and one second light source substrate holding member are connected. 22 are provided.

  Although not shown, a light source board fixing member for fixing the light source board 11 and the first light source board holding member 21, a first light source board holding member 21, and a second light source board holding member 22 are provided. And a fixing member for fixing.

  The light source substrate 11 and the first light source substrate holding member 21 are accurately fixed to a predetermined position of the first light source substrate holding member 21 by the assembly adjustment method already described in the first embodiment.

  Hereinafter, a mechanism of the light source unit 20 that can fix the light source substrate 11 and the first light source substrate holding member 21 with high accuracy will be described with reference to FIG.

  FIG. 10 is a diagram for explaining a schematic configuration of the light source unit 20 in which the light source substrate 11 and the first light source substrate holding member 21 are fixed with high accuracy.

  As shown in FIG. 10A, in the light source unit 20, the first light source substrate holding member 21 and the second light source substrate holding member 22 constitute an L-shaped light source substrate holding member. The light source substrate 11 is accurately fixed to the reference surface 22s of the second light source substrate holding member 22 at a predetermined position of the first light source substrate holding member 21 by the light source substrate fixing member 14. .

  In the light source unit 20, the reference surface 22 s of the second light source substrate holding member 22 is arranged perpendicular to the surface of the first light source substrate holding member 21 that holds the light source substrate 11.

  On the lower side of the light source substrate 11 provided with the light source 15, as shown in FIG. 10B, two notches 11a and 11b are formed, while the first light source substrate holding member 21 is formed. As shown in FIG. 4C, two openings 21a and 21b used for adjustment are formed.

  Then, the first light source substrate 11 (center of the light source 15) is disposed at a predetermined position of the first light source substrate holding member 21 with respect to the reference surface 22s of the second light source substrate holding member 22. When the surface of the holding member 21 that holds the light source substrate 11 and the light source substrate 11 are overlapped and fixed by the light source substrate fixing member 14, two notches are formed as shown in FIG. Each of the portions 11a and 11b and each of the two openings 21a and 21b are completely overlapped.

  In the present embodiment, each of the two notches 11a and 11b and each of the two openings 21a and 21b are completely overlapped, but the present invention is not limited to this. Even when each of the two notches 11a and 11b and each of the two openings 21a and 21b are at least partially overlapped, the light source substrate 11 and the first light source substrate can be obtained by the assembly adjustment method described above. The holding member 21 can be accurately fixed to the reference surface 22s of the second light source substrate holding member 22.

  The position, number, and shape of the opening and the position, number, and shape of the notch are determined in a timely manner by the assembly adjustment method described above.

  And as the 1st light source substrate holding member 21 and the 2nd light source holding member 22, it is desirable to use material with high heat conductivity. This is to efficiently diffuse the heat generated by the light source substrate 11. For example, the material may be aluminum A1050 or the like, and if the thermal conductivity is 100 W / (m · K) or more, sufficient heat dissipation is possible.

  Further, it is desirable that the first light source substrate holding member 21 and the second light source substrate holding member 22 are fixed in close contact with each other. The fixing may be a screw fixing or a thermosetting adhesive. In the case of screw fixing, grease may be applied to the contact interface.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and the present invention can be obtained by appropriately combining technical means disclosed in different embodiments. Embodiments are also included in the technical scope of the present invention.

  The present invention can be used for backlights of liquid crystal display devices such as televisions and monitors, and is particularly applicable to side-edge type backlights. Moreover, such a backlight can be applied to a lighting device as a large planar light source.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Light source unit 4 Liquid crystal display panel 8 Light guide plate (light guide)
9 Backlight 11 Light source board 11a, 11b Notch part 11c, 11d Connection part 12 Light source board holding member (holding member)
12a, 12b Opening 12S Reference plane 14 Light source substrate fixing member (fixing member)
15 Light source (light emitting element)
16 Assembly adjustment jig (positioning member)
16b, 16c Adjustment pin 21 First light source substrate holding member (holding member)
21a, 21b Notch 22 Second light source substrate holding member (holding member)
22S Reference plane

Claims (6)

A light source unit comprising: a light emitting element; a light source substrate including the light emitting element; and a holding member having a first surface for holding the light source substrate,
The light source substrate is provided with a connecting portion capable of connecting a plurality of light source substrates, and a cutout portion on one side of the longitudinal side of the light source substrate,
An opening is provided in the first surface of the holding member,
In order to arrange the light emitting element at a predetermined position with respect to the holding member, the first surface of the holding member and the light source substrate are overlapped, and provided between the first surface and the light source substrate. The light source unit, wherein the opening and the cutout overlap at least partially when fixed by a fixing member.   The light source unit according to claim 1, wherein a plurality of the openings and the notches are provided.   The said holding member is provided with the 2nd surface arrange | positioned perpendicularly | vertically with respect to the said 1st surface with the said holding member, or as a different body, The Claim 1 or 2 characterized by the above-mentioned. Light source unit.   A light source unit according to any one of claims 1 to 3, a light guide having a light emitting surface for emitting light emitted from the light emitting element in the light source unit, and a liquid crystal display panel. A liquid crystal display device characterized by the above. A method of manufacturing a light source unit comprising: a light emitting element; a light source substrate including the light emitting element; and a holding member having a first surface that holds the light source substrate.
An opening formed on the first surface for holding the light source substrate and a notch formed on one side of the light source substrate in the longitudinal direction using a positioning member having an adjustment pin in plan view A method of manufacturing a light source unit, wherein the position is adjusted so that at least a part thereof overlaps.   An opening formed in the first surface for holding the light source substrate and a notch formed in one side of the light source substrate on the longitudinal side are adjusted in position by the fixing member, and the light source The method of manufacturing a light source unit according to claim 5, wherein the substrate and the first surface of the holding member are fixed.

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