WO2011142145A1 - Light source, light source device, and display device - Google Patents

Abstract

Disclosed is a light source having improved light use efficiency. The light source is provided with an LED chip (11), and a package main body (12), which has an inside region where the LED chip (11) is mounted, and which has the surface facing one side in the direction (A) as a light emitting surface (12a), and the non light emitting surface (12b) connected to a wiring board (8). A protruding section (15) that protrudes outward in the direction (B) that intersects the direction (A) is provided on the package main body (12), and one surface of the protruding section (15) is formed as a sheet pressing surface (15a).

Description

Light source, light source device and display device

The present invention relates to a light source, a light source device, and a display device.

In a liquid crystal display device that is one of the display devices, a liquid crystal display panel that displays an image does not emit light. Therefore, a light source device called a backlight unit is provided on the back surface (opposite surface of the display surface) of the liquid crystal display panel. The display operation is performed by installing and illuminating the back side of the liquid crystal display panel with the backlight unit.

As a light source used in the backlight unit, a cold cathode fluorescent lamp in which mercury or xenon is enclosed in a fluorescent tube is known. However, when the cold cathode fluorescent lamp is used as the light source of the backlight unit, there are disadvantages that the light emission luminance and life are insufficient, and that the luminance on the low-pressure side is low, making it difficult to obtain a uniform light emission. It was.

Therefore, in order to eliminate such inconvenience, a backlight unit using an LED package (light emitting diode package) as a light source instead of the cold cathode fluorescent lamp has been proposed (for example, see Patent Document 1). When an LED package is used as a light source as in the proposed backlight unit, high luminance and low power consumption can be achieved, and in addition, environmental load can be reduced.

Also, the backlight unit is roughly classified into two types, an edge light type and a direct type.

The edge light type backlight unit has a light guide plate arranged immediately below a liquid crystal display panel and a light source arranged to face a predetermined side end surface of the light guide plate. In the edge light type backlight unit, when light is emitted from the light source, the light from the light source is introduced into the light guide plate through a predetermined side end surface of the light guide plate. Then, the light introduced into the light guide plate is emitted from the front surface of the light guide plate (the surface directed to the liquid crystal display panel side) to illuminate the liquid crystal display panel.

On the other hand, the direct type backlight unit has a light source arranged directly under the liquid crystal display panel. Such a direct type backlight unit is advantageous for illuminating a large area with high output, and is often used for a large-sized liquid crystal display device.

By the way, in a direct type backlight unit using an LED package as a light source, a light reflecting sheet is generally used in order to cause light emitted from the LED package to efficiently travel toward the liquid crystal display panel side. . For example, as shown in FIG. 29, since the LED package 101 is normally mounted on the mounting surface 102a of the wiring board 102, the light reflecting sheet 103 is disposed on the mounting surface 102a of the wiring board 102. Then, in order to prevent the light emitting surface 101 a of the LED package 101 from being covered with the light reflecting sheet 103, a hole 103 a is formed in the light reflecting sheet 103, and the LED package 101 is exposed from the hole 103 a of the light reflecting sheet 103. (Protruding).

JP 2005-352427 A

However, when the light reflecting sheet 103 is arranged so as to cover the mounting surface 102a of the wiring substrate 102, the mounting surface 102a of the wiring substrate 102 and the light reflecting sheet 103 must be fixed by some method (for example, double-sided tape). For example, as shown in FIG. 30, the light reflecting sheet 103 may be lifted from the mounting surface 102 a of the wiring substrate 102. Then, when the light reflecting sheet 103 floats around the LED package 101, the light emitted from the LED package 101 turns to the back surface of the light reflecting sheet 103 (opposite surface that reflects light toward the illuminated body). As a result, the loss of light increases and the light use efficiency decreases.

In Patent Document 1, the light reflecting sheet is attached to the chassis by a stud, and thereby the light reflecting sheet is fixed. For this reason, the light reflection sheet can be prevented from being lifted to some extent, but the light reflection sheet is lifted around the LED package. Therefore, in order to suppress the lifting of the light reflecting sheet around the LED package, it is necessary to fix the light reflecting sheet with the stud around the LED package. However, if it does in this way, since the number of studs must be increased, and also the mounting holes for studs formed in the chassis must be increased, there arises a new disadvantage that the cost increases. Moreover, if the mounting holes for studs formed in the chassis are increased, there is a concern that the strength of the chassis will decrease.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a light source, a light source device, and a display device that can improve the light use efficiency.

In order to achieve the above object, a light source according to the first aspect of the present invention has a light emitting diode chip and a region on which the light emitting diode chip is mounted on the inside, and a surface facing one side in a predetermined first direction emits light. A light emitting surface that emits light generated by the diode chip, and a package body having a light emitting surface that faces the other side in the first direction and that is connected to the wiring board. The package body is provided with a protruding portion that protrudes outward in a second direction that intersects the first direction, and one surface of the protruding portion is a sheet pressing surface.

In the light source according to the first aspect, by configuring as described above, even when some sheet member is arranged around the package body and used, even if the sheet member floats around the package body, the sheet member The raised part can be pressed by the sheet pressing surface of the protruding part. Thereby, the lift of the sheet member does not exceed the light emitting surface of the package body. Therefore, the light (lost light) that wraps around the back surface (the surface opposite to the surface directed toward the illuminated body) of the sheet member decreases, and the amount of light traveling toward the illuminated body increases accordingly. As a result, the light utilization efficiency can be improved.

In addition to this effect, if the sheet member can be pressed by the sheet pressing surface of the protruding portion, there is no need to fix the sheet member with a fixing member such as a double-sided tape or a stud. In addition to being easy, it is also easy to remove and reuse (rework) the sheet member in the event of problems. Further, it is not necessary to separately prepare a fixing member such as a double-sided tape or a stud, so that the cost can be reduced. Furthermore, when a stud is used, a mounting hole for the stud must be formed in the chassis. However, since it is not necessary, the strength of the chassis is not lowered.

In the light source according to the first aspect, it is preferable that the light reflecting sheet positioned around the package body is pressed by the sheet pressing surface of the protruding portion. According to this structure, when the light reflecting sheet is arranged around the package body, the light reflecting sheet is prevented from being lifted by the sheet pressing surface of the protruding portion. The light (lost light) that wraps around the opposite side of the light reflecting surface toward the body side is reduced, and as a result, the light use efficiency is improved.

In the light source according to the first aspect, a protrusion may be formed on a side wall connecting the light emitting surface and the anti-light emitting surface of the package body. If comprised in this way, the package main body provided with the protrusion part can be obtained easily.

In the configuration in which the protrusion is formed on the side wall of the package body, it is preferable that the protrusion is integrally formed on the side wall of the package body. If the projecting portion is integrated with the side wall of the package body in this way, the manufacturing process is simplified because it is not necessary to prepare the package body and the projecting portion in separate steps.

In the configuration in which the protruding portion is formed on the side wall of the package body, it is preferable that the position of the protruding portion in the first direction of the sheet pressing surface is closer to the light emitting surface side than the light emitting surface side of the package body. If comprised in this way, the lift of a sheet | seat member can be made still smaller.

In the configuration in which the protruding portion is formed on the side wall of the package body, it is preferable that the protruding amount of the protruding portion in the second direction is gradually increased from the light emitting surface side to the light emitting surface side of the package body. If comprised in this way, it will become difficult to damage a protrusion part.

In the light source according to the first aspect, an optical member may be attached on the light emitting surface of the package body, and an end of the optical member may protrude outward from the package body in the second direction. In this case, it is preferable that the end portion of the optical member is a protruding portion.

The light source device according to the second aspect of the present invention includes the light source according to the first aspect and a light reflecting sheet for reflecting light from the light source. A hole is formed in the light reflecting sheet, and a light source is protruded from the hole of the light reflecting sheet, and the light reflecting sheet is formed by a sheet pressing surface of the protruding portion provided in the package body of the light source. The edge of the hole is pressed.

In the light source device according to the second aspect, the light utilization efficiency can be easily improved by configuring as described above.

A display device according to a third aspect of the present invention includes the light source device according to the second aspect and a display panel illuminated by the light source device.

The display device according to the third aspect is configured as described above, so that the light use efficiency can be improved and the illumination light for illuminating the display panel can be brightened.

As described above, according to the present invention, the light use efficiency can be easily improved.

It is the disassembled perspective view which showed an example of the whole structure of the display apparatus (light source device) to which this invention is applied. It is sectional drawing of the light source by 1st Embodiment (The figure at the time of seeing the cross section cut | disconnected by the plane perpendicular | vertical with respect to the light emission surface of a package main body). FIG. 3 is a plan view of the light source according to the first embodiment (viewed from the light emitting surface side of the package body). It is a figure of the light source periphery of the light source device provided with the light source by 1st Embodiment. It is a figure of the hole periphery periphery of the light reflection sheet used for the light source device shown in FIG. It is a figure when the light reflection sheet used for the light source device shown in FIG. 4 is attached. It is a figure for demonstrating the effect of 1st Embodiment. It is sectional drawing of the light source by the modification of 1st Embodiment (The figure at the time of seeing the cross section cut | disconnected by the plane perpendicular | vertical with respect to the light emission surface of a package main body). It is a figure for demonstrating the effect of the modification shown in FIG. It is a top view of the light source by the modification of 1st Embodiment (The figure at the time of seeing from the light emission surface side of a package main body). It is a figure for demonstrating the effect of the modification shown in FIG. It is a top view of the light source by the modification of 1st Embodiment (The figure at the time of seeing from the light emission surface side of a package main body). It is a top view of the light source by the modification of 1st Embodiment (The figure at the time of seeing from the light emission surface side of a package main body). It is the figure which showed the example of arrangement | positioning of the light source by the modification of 1st Embodiment. It is a figure of the hole periphery vicinity of the light reflection sheet used when employ | adopting the example of arrangement | positioning shown in FIG. It is a figure for demonstrating the effect at the time of employ | adopting the example of arrangement | positioning shown in FIG. It is a figure for demonstrating the effect at the time of employ | adopting the example of arrangement | positioning shown in FIG. It is the figure which showed the example of arrangement | positioning of the light source by the modification of 1st Embodiment. It is a figure for demonstrating the effect in the case of employ | adopting the example of arrangement | positioning shown in FIG. It is a figure of the hole periphery vicinity of the light reflection sheet used when employ | adopting the example of arrangement | positioning shown in FIG. It is sectional drawing of the light source by 2nd Embodiment (The figure at the time of seeing the cross section cut | disconnected by the plane perpendicular | vertical with respect to the light emission surface of a package main body). It is a figure for demonstrating the effect of 2nd Embodiment. It is sectional drawing of the light source by the modification of 2nd Embodiment (The figure at the time of seeing the cross section cut | disconnected by the plane perpendicular | vertical with respect to the light emission surface of a package main body). It is a figure for demonstrating the effect of the modification shown in FIG. It is sectional drawing of the light source by 3rd Embodiment (The figure at the time of seeing the cross section cut | disconnected by the plane perpendicular | vertical with respect to the light emission surface of a package main body). It is a figure for demonstrating the effect of 3rd Embodiment. It is sectional drawing of the light source by 4th Embodiment (The figure at the time of seeing the cross section cut | disconnected by the plane perpendicular | vertical with respect to the light emission surface of a package main body). It is a figure for demonstrating the effect of 4th Embodiment. It is a figure of the light source periphery of the conventional light source device. It is a figure for demonstrating the conventional problem.

(First embodiment)
First, an example of the overall configuration of a display device to which the present invention is applied will be described with reference to FIG.

This display device is a liquid crystal display device, and as shown in FIG. 1, a liquid crystal display panel 1 having a display surface 1a and LEDs installed on the back side opposite to the display surface 1a side of the liquid crystal display panel 1 At least a backlight unit 2 is provided. Although not shown, a panel drive circuit is connected to the liquid crystal display panel 1 and an LED drive circuit is connected to the LED backlight unit 2. Then, the optical property (transmittance) of the liquid crystal display panel 1 is changed for each pixel, and the back side of the liquid crystal display panel 1 is illuminated with the backlight from the LED backlight unit 2. A desired image is displayed on one display surface 1a. The liquid crystal display panel 1 is an example of the “display panel” in the present invention, and the LED backlight unit 2 is an example of the “light source device” in the present invention.

As a specific configuration, the liquid crystal display panel 1 includes a liquid crystal layer, a pair of glass substrates (an active matrix substrate and a counter substrate), a polarizing plate, and the like. And a liquid crystal layer is pinched | interposed between a pair of glass substrates, and the polarizing plate is each arrange | positioned on the surface on the opposite side to the liquid crystal layer side of the pair of glass substrate.

The LED backlight unit 2 is called a direct type and includes a back chassis 3, a light emitting module 4, a light reflecting sheet 5, an optical sheet 6, and the like.

The back chassis 3 is formed in a substantially box shape with the liquid crystal display panel 1 side opened. That is, the back chassis 3 has a bottom portion and side portions erected on the outer periphery of the bottom portion. And the area | region enclosed by the side part of the back chassis 3 is made into the accommodation area | region.

The light emitting module 4 is for generating illumination light (light for illuminating the back side of the liquid crystal display panel 1). The light emitting module 4 is housed in a housing area of the back chassis 3 and spaced apart from each other by a predetermined distance. Are two-dimensionally arranged. The plurality of light emitting modules 4 are attached to the bottom of the back chassis 3, thereby being arranged in a region immediately below the liquid crystal display panel 1 (a region facing the back surface of the liquid crystal display panel 1).

The plurality of light emitting modules 4 housed in the housing area of the back chassis 3 each have two or more LED packages 7 and one wiring board 8. In each light emitting module 4, two or more LED packages 7 are collectively mounted (connected) on the mounting surface 8 a of one wiring substrate 8, thereby being modularized. By the way, the number of the light emitting modules 4 accommodated in the accommodating area | region of the back chassis 3 is not specifically limited, It can change according to a use etc. Further, the number of LED packages 7 mounted on the mounting surface 8a of the wiring board 8 is not particularly limited. The LED package 7 is an example of the “light source” in the present invention, and the structure thereof will be described in detail later.

The light reflecting sheet 5 is for reflecting the light emitted from the light emitting module 4 toward the liquid crystal display panel 1, and is housed in the housing region of the back chassis 3 together with the light emitting module 4. The light reflecting sheet 5 covers the mounting surface 8a of the wiring board 8 from the liquid crystal display panel 1 side. However, in order to expose (project) the LED package 7 to the liquid crystal display panel 1 side, It has a rectangular hole 5a. That is, the same number of holes 5 a as the number of LED packages 7 are formed in the light reflecting sheet 5, and one LED package 7 is exposed (projected) from each of the holes 5 a of the light reflecting sheet 5. Yes.

The optical sheet 6 is a sheet group including a diffusion sheet, a prism sheet, and the like, and is disposed so as to close the opening of the back chassis 3. Thereby, when light is emitted from the light emitting module 4, the light enters the optical sheet 6, and the light is diffused or condensed.

Next, the structure of the LED package 7 of the first embodiment will be described with reference to FIGS. In the following description, the normal direction of the mounting surface 8a of the wiring board 8 and the vicinity thereof are referred to as the A direction (the direction corresponding to the “first direction” of the present invention), and intersect with the A direction (the orthogonal direction is The direction to include is called the B direction (the direction corresponding to the “second direction” of the present invention).

As shown in FIG. 2, the LED package 7 of the first embodiment includes at least an LED chip 11 that actually generates light and a package body 12 on which the LED chip 11 is mounted.

The package body 12 on which the LED chip 11 is mounted is made of a concave body having at least a frame-like side wall SW, and the mounting area of the LED chip 11 is on the bottom surface inside the concave body. Therefore, when light is generated by the LED chip 11, the light from the LED chip 11 is emitted from the opening of the concave shaped body. That is, the opening surface of the package body 12 (the surface on the side where the concave body is opened) is the light emitting surface 12a.

Further, the surface opposite to the light emitting surface 12a of the package body 12 is a terminal surface (hereinafter referred to as an anti-light emitting surface 12b) mounted (connected) to the mounting surface 8a of the wiring board 8. Therefore, when the LED package 7 is mounted on the mounting surface 8a of the wiring substrate 8, the light emitting surface 12a of the package body 12 is directed to one side in the A direction (the side facing away from the mounting surface 8a of the wiring substrate 8). Thus, the light emitting surface 12b of the package body 12 is directed to the other side in the A direction (side toward the mounting surface 8a of the wiring board 8). That is, it can be said that the LED package 7 of the first embodiment is a top view type.

The inner side surface, which is the inner side surface of the package body 12, is a light reflecting surface, and is inclined so as to spread radially from the bottom surface side toward the light emitting surface 12a side. Thereby, even if the light from the LED chip 11 is incident on the inner surface without going to the light emitting surface 12 a of the package body 12, the light is reflected on the inner surface of the package body 12, and from the light emitting surface 12 a of the package body 12. It is taken out.

Further, the package body 12 further includes a metal frame integrated therewith. The metal frame is divided into two frame portions 13a and 13b that are electrically insulated from each other. The predetermined portion of the frame portion 13a forms a part of the bottom surface of the package body 12, and the LED chip 11 is bonded to the predetermined portion of the frame portion 13a and is connected to one electrode of the LED chip 11. Wire is connected. The predetermined portion of the frame portion 13b forms a part of the bottom surface of the package body 12 together with the predetermined portion of the frame portion 13a. A wire connected to the other electrode of the LED chip 11 is connected to the predetermined portion of the frame portion 13b. Has been.

Furthermore, the frame portions 13a and 13b are both bent, whereby the tip portion 13c of the frame portion 13a and the tip portion 13d of the frame portion 13b are extended to the side opposite to the light emitting surface 12b of the package body 12. The tip portion 13c of the frame portion 13a and the tip portion 13d of the frame portion 13b are terminal portions that are connected to wiring (not shown) on the mounting surface 8a of the wiring board 8.

Further, a sealing member 14 is embedded in the inner region of the package body 12 over the entire area. As a result, the LED chip 11 mounted in the inner region of the package body 12 is sealed.

Here, in 1st Embodiment, as shown to FIG. 2 and FIG. 3, the protrusion which protrudes outside toward the B direction in side wall SW which connects the light emission surface 12a and the anti-light-emitting surface 12b of the package main body 12 is carried out. A portion 15 is formed. One surface of the protruding portion 15 is a sheet pressing surface 15a.

Specifically, an outer peripheral end portion on the light emitting surface 12 a side of the side wall SW of the package body 12 protrudes in a rectangular shape, and an outer peripheral end portion that protrudes in the rectangular shape is a protruding portion 15. Therefore, the protrusion 15 is formed integrally with the side wall SW of the package body 12. Note that the shape of the protruding portion 15 is not particularly limited. For example, the protruding portion 15 may protrude in a triangular shape, or the protruding portion 15 may protrude in a round shape.

Furthermore, the projecting portion 15 is formed over the entire outer periphery of the package body 12 when viewed in plan from the light emitting surface 12a side of the package body 12. That is, all of the outer peripheral end portions (four end portions) on the light emitting surface 12 a side of the package body 12 are the protruding portions 15.

The LED package 7 of the first embodiment has such a structure. When the LED package 7 is incorporated in the LED backlight unit 2, the light reflecting sheet 5 is positioned around the package body 12 as shown in FIG. 4. That is, the outer peripheral end portion of the package body 12 on the side opposite to the light emitting surface 12 b is surrounded by the edge of the hole portion 5 a of the light reflecting sheet 5.

As shown in FIGS. 3 and 5, the opening width Xc in the B1 direction of the hole 5a of the light reflecting sheet 5 is equal to or larger than the width Xa in the B1 direction of the outer peripheral end of the package body 12 on the side opposite to the light emitting surface 12b. Thus, the width is set to be smaller than the width Xb in the B1 direction of the outer peripheral end portion (the portion where the protruding portion 15 is formed) on the light emitting surface 12a side of the package body 12. Further, the opening width Yc in the B2 direction of the hole 5a of the light reflecting sheet 5 is also equal to or larger than the width Ya in the B2 direction of the outer peripheral end portion on the side opposite to the light emitting surface 12b of the package body 12, and on the light emitting surface 12a side of the package body 12. Is set to be smaller than the width Yb in the B2 direction of the outer peripheral end portion (the portion where the protruding portion 15 is formed). Therefore, as shown in FIG. 4, in a state where the light reflecting sheet 5 is disposed around the package body 12, the light reflecting sheet 5 and the protruding portion 15 overlap each other in a region C in the figure.

Incidentally, as shown in FIG. 6, the operation of covering the mounting surface 8 a of the wiring board 8 with the light reflecting sheet 5 is performed after the LED package 7 is mounted (connected) on the mounting surface 8 a of the wiring board 8. When the width of the outer peripheral end portion (the portion where the protruding portion 15 is formed) on the light emitting surface 12a side of the package body 12 is larger than the opening width of the hole portion 5a of the light reflecting sheet 5, the light reflecting sheet 5 It becomes difficult to pass the LED package 7 through the hole 5a. Therefore, in the first embodiment, as shown in FIG. 5, a cut 5b is made in the edge of the hole 5a of the light reflecting sheet 5 so that the LED package 7 is passed through the hole 5a of the light reflecting sheet 5. It is easy. There are no particular restrictions on the position and number of the cuts 5b to be inserted into the light reflecting sheet 5, and it may be changed according to the shape of the protrusions 15 and the like. Of course, the light reflecting sheet 5 may not have the cut 5b.

When the cut 5b is made in the light reflecting sheet 5, the opening width Xc in the B1 direction of the hole 5a of the light reflecting sheet 5 is set to the width Xa in the B1 direction of the outer peripheral end of the package body 12 on the side opposite to the light emitting surface 12b. The opening width Yc in the B2 direction of the hole 5a of the light reflecting sheet 5 can be made smaller than the width Ya in the B2 direction of the outer peripheral end of the package body 12 on the side opposite to the light emitting surface 12b. However, if it does in this way, an excess part will arise in the light reflection sheet 5, and when the processing method and optical influence of the excess part of the light reflection sheet 5 are considered, it is not so preferable.

In the first embodiment, as described above, even if the light reflecting sheet 5 floats on the light emitting surface 12a side of the package body 12 around the LED package 7 as shown in FIG. The raised portion of the sheet 5 can be pressed by the sheet pressing surface 15 a of the protruding portion 15. Thereby, the lift of the light reflecting sheet 5 does not exceed the light emitting surface 12a of the package body 12. Therefore, the light (lost light) that wraps around the back surface of the light reflecting sheet 5 (the surface opposite to the surface that reflects the light toward the liquid crystal display panel 1 side) is reduced, and the liquid crystal display panel 1 side is correspondingly reduced. The light traveling toward increases. As a result, the light use efficiency is improved, and the illumination light for illuminating the back side of the liquid crystal display panel 1 can be brightened.

In addition to this effect, if the light reflecting sheet 5 is pressed by the sheet pressing surface 15a of the protruding portion 15, it is not necessary to fix the light reflecting sheet 5 with a fixing member such as a double-sided tape or a stud, As a result, the light reflecting sheet 5 can be easily attached, and it is also easy to remove and reuse (rework) the light reflecting sheet 5 when a problem or the like occurs. Further, it is not necessary to separately prepare a fixing member such as a double-sided tape or a stud, so that the cost can be reduced. Furthermore, when a stud is used, a stud mounting hole must be formed in the back chassis 3. However, since it is not necessary, the strength of the back chassis 3 is not lowered.

Further, in the first embodiment, as described above, by integrally forming the protruding portion 15 on the side wall SW of the package body 12, the light reflecting sheet 5 can be easily formed by the protruding portion 15 (sheet pressing surface 15a). Can be pressed. Furthermore, if the projecting portion 15 is integrated with the sidewall SW of the package main body 12, the manufacturing process is simplified because the manufacturing of the package main body 12 and the manufacturing of the projecting portion 15 do not have to be performed in separate steps.

Note that the following configuration can be considered as a modification of the configuration of the first embodiment.

Specifically, in the configuration of the first embodiment, as shown in FIG. 8, between the outer peripheral end on the light emitting surface 12a side and the outer peripheral end on the anti-light emitting surface 12b side of the sidewall SW of the package body 12. The protruding portion 15 is protruded from the intermediate portion between them, so that the position of the sheet pressing surface 15a of the protruding portion 15 in the A direction is closer to the counter light emitting surface 12b side than the light emitting surface 12a side of the package body 12. Good. In this way, as shown in FIG. 9, the light reflection sheet 5 is further less lifted around the LED package 7, and the degree of adhesion of the light reflection sheet 5 to the mounting surface 8 a of the wiring board 8 is increased. Therefore, the flatness of the light reflecting sheet 5 is improved and the optical quality is improved.

In the configuration of the first embodiment, all of the outer peripheral end portions (four end portions) on the light emitting surface 12a side of the package body 12 protrude from the light emitting surface 12a side of the package main body 12 in a plan view. Instead of the portion 15, only a part of the outer peripheral end portion on the light emitting surface 12 a side of the package body 12 may be the protruding portion 15. For example, as shown in FIG. 10, only one end portion of the outer peripheral end portions (four end portions) on the light emitting surface 12 a side of the package main body 12 may be the protruding portion 15. Even if it is such a structure, as shown in FIG. 11, the lifting of the light reflection sheet 5 around the LED package 7 can be suppressed.

Further, in addition to the configuration shown in FIG. 10, as shown in FIG. 12, two end portions of the outer peripheral end portions (four end portions) on the light emitting surface 12 a side of the package main body 12 may be the protruding portions 15. Then, as shown in FIG. 13, two projecting portions 15 may be projected from one end portion of the outer peripheral end portions (four end portions) on the light emitting surface 12 a side of the package body 12.

If only a part of the outer peripheral end portion on the light emitting surface 12a side of the package body 12 is the protruding portion 15, depending on the case, it becomes possible to make the attachment of the light reflecting sheet 5 easier. A description will be given by taking as an example a configuration (see FIG. 10) in which only one end portion of the outer peripheral end portion on the light emitting surface 12a side of the package body 12 is the protruding portion 15.

That is, in order to further enhance the ease of mounting of the light reflecting sheet 5, as shown in FIG. 14, when mounting a plurality of LED packages 7 on the mounting surface 8 a of the wiring substrate 8, the respective protrusions 15. All the projecting directions are the same direction (one direction of the B1 direction (B1a direction)). Further, as shown in FIGS. 10 and 15, the opening width Xc in the B1 direction of the hole 5a of the light reflecting sheet 5 is set to the outer peripheral end on the light emitting surface 12a side of the package body 12 (the portion where the protruding portion 15 is formed). The opening width Yc in the B2 direction of the hole 5a of the light reflecting sheet 5 is set to be equal to or larger than the width Ya of the outer peripheral end of the package body 12 in the B2 direction. In this case, the edge of the hole 5a of the light reflecting sheet 5 is not cut.

When the light reflecting sheet 5 is attached, as shown in FIGS. 16 and 17, after the LED package 7 is passed through the hole 5a of the light reflecting sheet 5, the light reflecting sheet 5 is shifted in the B1b direction. The attachment of the light reflecting sheet 5 is completed. According to this method, since it is not necessary to push the light reflecting sheet 5 into each of the plurality of LED packages 7, it is very easy to attach the light reflecting sheet 5.

However, when the above-described method is adopted, if the light reflecting sheet 5 is deviated in the B1a direction from the state where the light reflecting sheet 5 is completely attached (the state shown in FIG. 17), the light reflecting sheet 5 falls off. there is a possibility.

Therefore, if importance is placed on suppressing the falling off of the light reflecting sheet 5, the protruding directions of the protruding portions 15 of the adjacent LED packages 7 may be reversed as shown in FIGS. Thereby, even if the light reflection sheet 5 shifts in either the B1a direction or the B1b direction, the light reflection sheet 5 does not fall out. In this case, as shown in FIGS. 10 and 20, the opening width Xc of the hole 5a of the light reflecting sheet 5 in the B1 direction is set to the outer peripheral end of the package body 12 on the side opposite to the light emitting surface 12b. The width Xb in the B1 direction of the package body 12 is set to be smaller than the width Xb in the B1 direction of the outer peripheral end portion (the portion where the protruding portion 15 is formed) of the package body 12 on the light emitting surface 12a side. Further, the opening width Yc in the B2 direction of the hole 5a of the light reflecting sheet 5 is set to be equal to or larger than the width Ya of the outer peripheral end of the package body 12 in the B2 direction. Furthermore, you may make the cut 5b in the edge of the hole 5a of the light reflection sheet 5. FIG.

(Second Embodiment)
Next, the structure of the LED package 20 of the second embodiment will be described with reference to FIG.

As the structure of the LED package 20 of the second embodiment, as shown in FIG. 21, the LED chip 21 is mounted in an area inside the package body 22 as in the first embodiment. That is, the package body 22 is formed of a concave body having at least a frame-like side wall SW, and has a region for mounting the LED chip 21 on the bottom surface inside the concave body. Of the surfaces of the package body 22, the surface facing the one side in the A direction is the light emitting surface 22a, and the surface facing the other side in the A direction is the terminal surface (hereinafter referred to as the anti-light emitting surface 22b). . Further, frame portions 23a and 23b are integrated with the package main body 22, and respective front end portions (terminal portions) 23c and 23d of the frame portions 23a and 23b extend to the side opposite to the light emitting surface 22b of the package main body 22. Has been. Further, a sealing member 24 is embedded in a region inside the package body 22.

Here, in the second embodiment, the width of the package body 22 in the B direction is gradually increased from the non-light emitting surface 22b side toward the light emitting surface 22a side. For this reason, when the cross section cut | disconnected by the plane perpendicular | vertical with respect to the light emission surface 22a of the package main body 22 is seen, the external shape of the package main body 22 becomes a reverse trapezoid shape. In other words, in the second embodiment, the protruding portion 25 protruding outward in the B direction is integrally formed on the side wall SW of the package main body 22, and the protruding amount of the protruding portion 25 in the B direction is the package main body. 22 gradually increases from the light emitting surface 22b side to the light emitting surface 22a side.

And in 2nd Embodiment, the inclined surface of the protrusion part 25 (surface in which the angle made between the mounting surface 8a of the wiring board 8 becomes an acute angle) is made into the sheet pressing surface 25a.

In the second embodiment configured as described above, the lifting of the light reflecting sheet 5 is suppressed by the sheet pressing surface 25a of the protruding portion 25 as shown in FIG. Light (lost light) is reduced, and the light utilization efficiency can be improved. That is, the same effect as the first embodiment can be obtained.

Further, in the configuration of the second embodiment, the molding process of the package main body 22 becomes easier as compared with the configuration of the first embodiment.

In the configuration of the second embodiment, as shown in FIG. 23, the intermediate portion between the outer peripheral end portion on the light emitting surface 22a side and the outer peripheral end portion on the anti-light emitting surface 22b side of the side wall SW of the package body 22. The protrusion amount in the B direction of the protruding portion 25 is maximized at the portion, and thereby the position of the sheet pressing surface 25a of the protruding portion 25 in the A direction is moved closer to the light emitting surface 22b side than the light emitting surface 22a side of the package body 22. You may do it. In this way, as shown in FIG. 24, the floating of the light reflecting sheet 5 around the LED package 20 is further reduced.

(Third embodiment)
Next, with reference to FIG. 25, the structure of the LED package 30 of 3rd Embodiment is demonstrated.

As the structure of the LED package 30 of the third embodiment, as shown in FIG. 25, the LED chip 31 is mounted in the inner region of the package body 32 as in the first embodiment. That is, the package body 32 is formed of a concave body having at least a frame-like side wall SW, and has a region for mounting the LED chip 31 on the bottom surface inside the concave body. Of the surfaces of the package body 32, the surface facing the one side in the A direction is the light emitting surface 32a, and the surface facing the other side in the A direction is the terminal surface (hereinafter referred to as the anti-light emitting surface 32b). . Further, frame portions 33a and 33b are integrated with the package body 32, and respective front end portions (terminal portions) 33c and 33d of the frame portions 33a and 33b extend to the side opposite to the light emitting surface 32b of the package body 32. Has been. Further, a sealing member 34 is embedded in a region inside the package body 32.

Here, in the third embodiment, out of the sidewall SW of the package body 32, the outer peripheral end on the light emitting surface 32a side and the outer peripheral end on the anti-light emitting surface 32b side each protrude in a rectangular shape toward the outside in the B direction. Has been. That is, the protrusions 35 are integrally formed on both the outer peripheral end on the light emitting surface 32a side and the outer peripheral end on the side opposite to the light emitting surface 32b of the side wall SW of the package body 32. For this reason, when the cross section cut along a plane perpendicular to the light emitting surface 32a of the package main body 32 is viewed, the outer peripheral end of the package main body 32 on the light emitting surface 32a side and the outer peripheral end on the anti-light emitting surface 32b side are between The middle part is depressed. The shape of the recess in the side wall SW of the package body 32 is not particularly limited. For example, an intermediate portion of the side wall SW of the package body 32 may be recessed in a triangular shape, or the side wall of the package body 32 may be recessed. The middle part of the SW may be rounded and recessed.

And in 3rd Embodiment, one surface of the protrusion part 35 by the side of the light emission surface 32a of the package main body 32 is made into the sheet | seat pressing surface 35a.

In the third embodiment configured as described above, as shown in FIG. 26, the edges of the hole 5a of the light reflecting sheet 5 are sandwiched between a pair of projecting portions 35, whereby the floating of the light reflecting sheet 5 is projected. It can be suppressed by the 35 sheet pressing surface 35a. Thereby, the light (lost light) which goes around to the back surface side of the light reflection sheet 5 decreases, and the utilization efficiency of light can be improved. That is, the same effect as the first embodiment can be obtained.

(Fourth embodiment)
Next, the structure of the LED package 40 according to the fourth embodiment will be described with reference to FIG.

As the structure of the LED package 40 of the fourth embodiment, as shown in FIG. 27, the LED chip 41 is mounted in an area inside the package body 42 as in the first embodiment. That is, the package body 42 is formed of a concave body having at least a frame-like side wall SW, and has a region for mounting the LED chip 41 on the bottom surface inside the concave body. Of the surfaces of the package body 42, the surface facing the one side in the A direction is the light emitting surface 42a, and the surface facing the other side in the A direction is the terminal surface (hereinafter referred to as the anti-light emitting surface 42b). . Further, frame portions 43a and 43b are integrated with the package body 42, and respective tip portions (terminal portions) 43c and 43d of the frame portions 43a and 43b extend to the side opposite to the light emitting surface 42b of the package body 42. Has been. Further, a sealing member 44 is embedded in a region inside the package body 42.

Here, in the fourth embodiment, an optical member 45 such as a lens is mounted on the light emitting surface 42a of the package body 42. The width of the optical member 45 in the B direction is larger than the width of the package body 42 in the B direction. Has also been enlarged. For this reason, the end 45a of the optical member 45 is in a state protruding from the package body 42 toward the outside in the B direction. That is, in the fourth embodiment, the end 45a of the optical member 45 corresponds to the “projection” of the present invention. The type and shape of the optical member 45 are not particularly limited as long as a part of the optical member 45 protrudes outward from the package body 42 in the B direction.

In the fourth embodiment, one surface of the end portion 45a of the optical member 45 (a surface that is flush with the light emitting surface 42a of the package body 42) is the sheet pressing surface 45b.

In the configuration of the fourth embodiment configured as described above, when the light reflecting sheet 5 floats on the light emitting surface 42a side of the package body 42 around the LED package 40 as shown in FIG. Since the raised portion of the sheet 5 is pressed by the sheet pressing surface 45b of the end portion 45a of the optical member 45, the light (lost light) that wraps around the back surface side of the light reflecting sheet 5 is reduced. The utilization efficiency can be improved. That is, the same effect as the first embodiment can be obtained.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

For example, in the above-described embodiment, an example in which the present invention is applied to a liquid crystal display device as a display device has been described. However, the present invention is not limited to this and can be applied to display devices other than the liquid crystal display device.

1 Liquid crystal display panel (display panel)
2 LED backlight unit (light source device)
5 Light reflection sheet 5a Hole 7, 20, 30, 40 LED package (light source)
11, 21, 31, 41 LED chip (light emitting diode chip)
12, 22, 32, 42 Package body 12a, 22a, 32a, 42a Light emitting surface 12b, 22b, 32b, 42b Anti-light emitting surface 15, 25, 35, 45a Projecting portion 15a, 25a, 35a, 45b Sheet pressing surface 45 Optical member SW side wall

Claims (9)

A light emitting diode chip;
The surface on which the light emitting diode chip is mounted has an inner side, and a surface facing one side in a predetermined first direction is a light emitting surface that emits light generated by the light emitting diode chip and faces the other side in the first direction. A package body whose anti-light-emitting surface is connected to the wiring board,
A light source characterized in that a protrusion projecting outward in a second direction intersecting the first direction is provided on the package body, and one surface of the protrusion is a sheet pressing surface. The light source according to claim 1, wherein a light reflecting sheet positioned around the package body is pressed by a sheet pressing surface of the protruding portion. The light source according to claim 1 or 2, wherein the protruding portion is formed on a side wall connecting the light emitting surface and the anti-light emitting surface of the package body. 4. The light source according to claim 3, wherein the protrusion is integrally formed on a side wall of the package body. The light source according to claim 3 or 4, wherein the position of the sheet pressing surface of the protruding portion in the first direction is closer to the light emitting surface side than the light emitting surface side of the package body. 6. The protruding amount of the protruding portion in the second direction is gradually increased from the light emitting surface side to the light emitting surface side of the package body. light source. An optical member is attached on the light emitting surface of the package body, and an end of the optical member protrudes outward from the package body in the second direction,
The light source according to claim 1, wherein an end portion of the optical member is the protruding portion. A light source according to any one of claims 1 to 7,
A light reflecting sheet for reflecting light from the light source,
A hole is formed in the light reflecting sheet, and the light source protrudes from the hole in the light reflecting sheet,
The light source device, wherein an edge of the hole portion of the light reflecting sheet is pressed by a sheet pressing surface of a protruding portion provided on a package body of the light source. The light source device according to claim 8;
And a display panel illuminated by the light source device.

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