JP2002133932A - Light source element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source element wherein the red, green, and blue light emitted by red, green, and blue LEDs, respectively, are almost entirely mixed so that almost the entire exiting light is white while, if a light-emission failure occurs at any of three LEDs, that LED is replaced to restore the white light emitting function. SOLUTION: A light guide member 5 is provided where a rear surface comprises three protruding parts 6 comprising a curved surface, with an LED housing recessed part 7 provided to each apex part of the protruding parts 6 while both side surfaces 8 formed into curved surfaces, and a front surface is formed into an exit surface 9 from which the light coming from the LED housing recessed parts 7 of the three protruding parts 6 exits. There also provided red LED10R, green RED10G, and blue LRD10B inserted into the LED housing recessed parts of the light guide member 5, respectively, and a diffusion layer 12 which, provided at the exit surface 9 of the light guide member 5, diffuses light that exits from the exit surface 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device using a light emitting diode (hereinafter, referred to as an LED) as a light source.

[0002]

2. Description of the Related Art For example, as a backlight of a display device such as a liquid crystal display panel which controls transmission of light to display.
There is a so-called side lamp type.

[0003] The side lamp type backlight comprises a light guide plate having at least one end face as an incident end face and a front face as an emission face, and a light source element provided to face the incident end face of the light guide plate. The light emitted from the light source element is made incident on the light guide plate from the incident end face thereof, and the light is guided inside the light guide plate and emitted from the emission surface.

As the light source element of the side lamp type backlight, a light source using a cold cathode tube as a light source and an LED
However, in terms of power consumption and noise, it is advantageous to use an LED that can be driven with a low DC voltage and does not generate noise.

However, there are various types of LEDs that emit colored light such as red, green, orange, and blue, but none of them emit white light.

For this reason, conventionally, a red LED that emits light in a red wavelength band and a green LE that emits light in a green wavelength band are conventionally used.
D and a blue LED that emits light in the blue wavelength band are housed side by side in a single package, and white light is obtained by mixing the red, green, and blue light emitted by these LEDs.

[0007]

However, in a light source element in which LEDs of three colors of red, green and blue are housed side by side in one package, most of the red, green and blue light emitted from each LED is respectively Because it goes straight inside the package while spreading radially from the LED and emits out of the package,
The mixture of green and blue light is not enough, so red, green,
The emission angle range of white light in which blue light is mixed in a well-balanced manner is narrow, and light emitted outside the angle range is light having a strong color of any of red, green, and blue.

Therefore, in a conventional display device using a backlight provided with this light source element, the color of light emitted from the backlight is uneven, and a display of good color quality cannot be obtained.

Further, the light source element has three colors of red, green and blue.
Since the LEDs of the three colors are housed in one package, it is impossible to replace the LEDs. Therefore, when white light cannot be obtained due to poor light emission of any of the three color LEDs. The light source elements had to be replaced entirely.

According to the present invention, red, green, and blue light emitted from a red LED, a green LED, and a blue LED can be almost completely mixed, and most of the emitted light can be emitted as white light. It is an object of the present invention to provide a light source element capable of restoring the function of emitting white light by exchanging the LED even if any of the above-mentioned devices has a light emission failure.

[0011]

A light source device according to the present invention comprises:
The rear surface has three convex portions each having a curved surface, and the LED receiving recesses are provided at the tops of these convex portions, respectively, and both side surfaces are each formed into a curved surface, and the front surface has the three convex portions. A light guide member having an emission surface for emitting light incident from the LED housing recess, and a red LED, a green LED, and a blue LED respectively inserted into the LED housing recesses of the three convex portions of the light guide member. And a diffusion layer provided on an emission surface of the light guide member and diffusing light emitted from the emission surface.

According to the light source element of the present invention, the red, green, and blue LEDs emitted by the red, green, and blue LEDs inserted into the three LED recesses on the rear surface of the light guide member.
Green light and blue light are respectively incident on the light guide member from the LED accommodating concave portion, and these lights travel straight in the light guide member, or refracted on the surface and both side surfaces of the convex portion while traveling. The light is mixed with each other and emitted from the emission surface on the front surface of the light guide member, and the light is diffused by the diffusion layer and further mixed and emitted.

Therefore, the red, green, and blue LEDs emitted from the red, green, and blue LEDs can be almost completely mixed in color, and most of the emitted light can be emitted as white light.

Further, according to this light source element, since the red LED, the green LED and the blue LED are inserted into the three LED recesses on the rear surface of the light guide member, the LEDs can be easily replaced. Therefore, even if light emission failure occurs in any of the three color LEDs, the white light emission function can be restored by replacing only the LED.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the light source element of the present invention has, on the rear surface, three convex portions each having a curved surface, and the LED housing concave portions are provided at the tops of these convex portions, respectively. And both sides are formed as curved surfaces,
A red LED, a green LED, and a blue LED are respectively inserted into the LED housing recesses of the three convex portions of the light guide member, the front surface of which is formed on an emission surface for emitting light incident from the LED housing recesses of the three convex portions. By providing a diffusion layer on the emission surface of the light guide member, red, green, and blue light emitted by the red, green, and blue LEDs are almost completely mixed, and most of the emitted light is converted to white light. In addition to being able to emit light, even if light emission failure occurs in any of the three colors of red, green and blue LEDs,
By exchanging only the LED, the function of emitting white light can be restored.

In the light source device according to the present invention, the diffusion layer is preferably a particle layer in which transparent spherical particles are densely arranged over the entire light exit surface of the light guide member. In this case, the spherical particles are the same as the spherical particles. It is preferable that the light guide member is attached to the light exit surface of the light guide member with a transparent adhesive or an adhesive having a different refractive index of light. The diameter of the spherical particles is 4
μm to 40 μm is desirable.

Further, it is preferable that the red LED, the green LED, and the blue LED are mounted on a common support member disposed behind the light guide member.

[0018]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a sectional view of a light source element, FIG. 2 is a perspective view of a light guide member and an LED support member of the light source element, FIG. 3 is a side view of a display device using a backlight having the light source element.

First, the display device shown in FIG. 3 will be described. This display device comprises a display panel 1 such as a liquid crystal display panel and a backlight 2 disposed behind the display panel.

The backlight 2 has a light guide plate 3 having at least one end face as an incident end face and an entire front face as an emission face.
And a light source element 4 provided so as to face the incident end face of the light guide plate 3. Light emitted from the light source element 4 is incident on the light guide plate 3 from the incident end face, and the light is guided. The light is guided through the light plate 3 and emitted from the emission surface.

Next, the light source element 4 will be described. As shown in FIGS. 1 and 2, the light source element 4 has three convex portions 6 having a curved surface on the rear surface. The LED receiving recesses 7 are provided at the tops of these convex portions, respectively, and both side surfaces 8 are respectively formed into curved surfaces, and the emission surfaces for emitting the light incident from the LED receiving recesses 7 of the three convex portions 6 on the front surface. A light guide member 5 on which the light guide 9 is formed, and LEDs of the three convex portions 6 of the light guide member 5
It includes a red LED 10R, a green LED 10G, and a blue LED 10B respectively inserted into the housing recess 7, and a diffusion layer 12 provided on the emission surface 9 of the light guide member 5 and diffusing light emitted from the emission surface 9. .

The light guide member 5, as shown in FIG.
The backlight 2 is a transparent elongated material made of acrylic resin or glass having a length substantially equal to the width of the light guide plate 3, and the emission surface 9 on the front surface thereof has a thickness (about 0.8 mm) of the light guide plate 3. ) Is a flat surface having substantially the same width.

The three convex portions 6 on the rear surface of the light guide member 5 are formed in parallel with each other over the entire length of the light guide member 5, and the LED housings provided on the tops of these convex portions 6, respectively. The concave portion 7 is formed over the entire length of the convex portion 6.

Further, the surfaces of the three convex portions 6 are formed into curved surfaces of a quadratic curve (for example, parabola), and both side surfaces 8 of the light guide member 5 are respectively formed by the three convex portions 6. Of these, it is formed as a quadratic curve (for example, parabolic) curved surface that extends the curved surface outside the convex portion 6 on both sides.

In this embodiment, as shown in FIG. 2, the red LED 10R, the green LED 10G and the blue LED
Each of the plurality of EDs 10B is provided (four in FIG. 2), and a plurality of red LEDs 10R are made to correspond to the first housing recess of the LED housing recesses 7 of the three convex portions 6 of the light guide member 5. A plurality of green LEDs 10 arranged at equal intervals
G are arranged at equal intervals corresponding to the second accommodation recess, and a plurality of blue LEDs 10B are arranged at equal intervals corresponding to the third accommodation recess.

The red LED 10R and the green LED 10G
The blue LED 10 </ b> B and the blue LED 10 </ b> B are attached to a common support member 11 having substantially the same length as the light guide member 5 so as to correspond to the LED housing recesses 7 of the three convex portions 6 of the light guide member 5.

The support member 11 has three colors of red, green and blue.
It is composed of a wiring board on which connection wirings (not shown) of the LEDs 10R, 10G, and 10B of three colors are formed.
D10R, 10G, and 10B are attached to the support member 11 by soldering their terminal electrodes to the wiring.

The support member 11 has the LEDs 10 R, 10 G, and 10 B of the three colors inserted into the LED housing recesses 7 of the three protrusions 6 of the light guide member 5 on the rear side of the light guide member 5. It is arranged in a state, and is detachably attached to a support member attaching portion (not shown) by means such as screws.

The diffusion layer 12 provided on the light exit surface 9 of the light guide member 5 has a transparent spherical particle 13 made of acrylic resin or glass and having a diameter of 4 μm to 40 μm over the entire light exit surface 9. The spherical particles 13 are attached to the emission surface 9 by a transparent adhesive material 14a having a different refractive index of light from the spherical particles 13.

Further, a transparent protective sheet 15 made of acrylic resin or glass is provided on the front surface of the diffusion layer 12. This protective sheet 15 has a transparent refractive index different from that of the spherical particles 13. Affixed to the front surface of the diffusion layer 12 with a simple adhesive material 14b.

The light source element 4 has three convex portions 6 each having a curved surface on the rear surface. The concave portions 7 are provided at the tops of these convex portions 6, respectively. The three projections 6 of the light guide member 5 are formed on a curved surface, and the front surface is formed on an emission surface 9 for emitting light incident from the LED housing recesses 7 of the three projections 6.
Since the red LED 10R, the green LED 10G, and the blue LED 10B are inserted into the LED housing recesses 7 and the diffusion layer 12 is provided on the emission surface 9 of the light guide member 5, the three Red LED 10R, green LED 10 inserted into LED housing concave portion 7 of convex portion 6
The red, green, and blue light emitted by the G and blue LEDs 10B respectively enter the inside of the light guide member 5 from the LED housing recess 7, and these lights are reflected by the light guide member 5 as shown by arrows in FIG. Inside, or refracted by the surface of the convex portion 6 and the side surfaces 8 and mixed with each other.

The refraction of light at the surface of the convex portion 6 and the side surfaces 8 of the light guide member 5 is caused by total reflection at the interface between the surface of the convex portion 6 and the side surfaces 8 and the outside air (air). Since the surface and the side surfaces 8 of the convex portion 6 of the light guide member 5 are formed in the shape of a quadratic curve (for example, a parabola) as described above, the light is guided from the LED housing concave portion 7. Most of the light that enters the inside of the light member 8 and travels through the inside of the light guide member 5 toward the surface of the convex portion 6 and both side surfaces 8 is the interface between the surface of the convex portion 6 and both side surfaces 8 and the outside air. And is guided inside the light guide member 5 without leaking to the outside.

The light that goes straight in the light guide member 5 or refracts on the surface of the convex portion 6 and the side surfaces 8 and mixes with each other is output from the front surface of the light guide member 5. 9, the light is diffused by the diffusion layer 12, and further mixed and emitted.

Therefore, according to the light source element 4, the red LED 10R, the green LED 10G and the blue LED
The red, green and blue light emitted by 10B is almost completely mixed,
Most of the emitted light can be emitted as white light.

In this embodiment, the diffusion layer 12
Is a particle layer in which transparent spherical particles 13 are densely arranged over the entire emission surface 9, and the spherical particles 13
Is adhered to the light exit surface 9 of the light guide member 5 with a transparent adhesive material 14a having a different refractive index of light from the spherical particles 13. Further, the protective sheet 15 is attached to the spherical particles 13.
Is attached to the entire surface of the diffusion layer 12 with a transparent adhesive material 14b having a different refractive index from the light, so that the light emitted from the emission surface 9 of the light guide member 5 is transmitted to the spherical particles 13 and the adhesive material. The light is scattered by the interface with the surfaces 14a and 14b and mixed effectively, and white light in which red, green and blue lights are more completely mixed can be emitted.

Further, the spherical particles 13 have a diameter of 4 μm.
Since the particles are extremely small particles having a size of m to 40 μm, white light having a high light scattering property and a uniform luminance distribution over a wide emission angle range can be emitted.

Therefore, in the display device shown in FIG. 3 using the backlight 2 having the light source element 4, the light emitted from the backlight 2 is an excellent white light without unevenness. Good color quality display can be obtained.

In addition, the light source element 4 is connected to the red LE
Since the D10R, the green LED 10G, and the blue LED 10B are respectively inserted into the LED housing recesses 7 of the three convex portions 6 on the rear surface of the light guide member 5, these LEDs 10R,
10G and 10B can be taken out from the LED housing recess 7 and can be easily replaced.
Even if any of the color LEDs 10R, 10G, and 10B has a light emission failure, the white light emitting function can be restored by replacing only the LED.

Further, the light source element 4 is provided with the red LE
D10R, green LED 10G and blue LED 10B,
A common support member 11 disposed on the rear side of the light guide member 5
3R LED 10R, 10G, 1
The structure can be simplified as compared with a case where the OBs are individually supported.

In the above embodiment, as shown in FIG. 2, the plurality of red LEDs 10R correspond to the first accommodating recesses of the LED accommodating recesses 7 of the three convex portions 6 of the light guide member 5. The plurality of green LEDs 10G are arranged corresponding to the second accommodation recess, and the plurality of blue LEDs 10B are arranged corresponding to the third accommodation recess.
10R, 10G, and 10B are the first, second, and third Ls.
For each ED accommodating recess 7, three color LEDs 10R, 10G,
10B may be alternately arranged.

In the above embodiment, the three convex portions 6 on the rear surface of the light guide member 5 are formed over the entire length of the light guide member 5,
The LED housing recesses 7 are formed at the tops of these protrusions 6 over the entire length thereof.
The LEDs 10R, 10G, and 10B may be formed so as to correspond to the positions where the LEDs 10R, 10G, and 10B are arranged.
May be formed corresponding to the arrangement positions of the three color LEDs 10R, 10G, and 10B, respectively.

Further, in the above embodiment, the diffusion layer 12 and the spherical particles 13 are adhered to the emission surface 9 of the light guide member 5 with the adhesive 14a, and the protective sheet 15 is adhered to the front surface of the diffusion layer 12 with the adhesive 14b. Although attached, a transparent adhesive having a refractive index different from that of the spherical particles 13 may be used instead of the adhesives 14a and 14b, and the protective sheet 15 may be omitted.

The diffusion layer 12 provided on the light exit surface 9 of the light guide member 5 may be a diffusion plate made of a resin film in which a light scattering filler is dispersed, a resin film having a roughened surface, or the like. In this case, the diffusion plate is connected to the light guide member 5.
It is not necessary to ask the refractive index of the pressure-sensitive adhesive or the adhesive to be attached to the light exit surface 9 of the light emitting device.

Further, in the above embodiment, the light enters the light guide member 8 from the LED housing recesses 7 of the three protrusions 6 on the rear surface of the light guide member 5, and the light guide member 5 Although the light traveling toward the front surface and both side surfaces 8 is totally reflected at the surface of the convex portion 6 and the interface between the both side surfaces 8 and the outside air, the surface of the convex portion 6 of the light guide member 5 and the light A reflective film may be provided on both side surfaces 8 so that light traveling toward the surface of the convex portion 6 and both side surfaces 8 in the light guide member 5 is reflected by the reflective films.

The light source element 4 of the first embodiment is
The light guide plate 3 of the backlight 2 shown in FIG. 3 is disposed so as to face substantially the entire length of the light incident surface of the light guide plate 3, and the present invention is, as shown in FIG. The invention can also be applied to a plurality of (four in FIG. 4) light source elements 4a arranged in the direction.

FIGS. 5 and 6 are exploded perspective views of a light source device showing the second and third embodiments of the present invention. The light source device 4a of the second and third embodiments is the same as that of FIG. As described above, a plurality of light guide plates 3 are arranged side by side in the length direction of the incident end face.

The light source element 4 of the second and third embodiments
a is the vertical and horizontal width of the light guide plate 3 (about 0.8 mm).
And a block-shaped light guide member 5a having a substantially square exit surface 9 which is substantially the same as that of the first embodiment, and three LEs respectively provided on the tops of the three convex portions 6 on the rear surface of the light guide member 5a.
Of the D accommodation recesses 7, one red LED 10R is inserted into the first LED accommodation recess 7, one green LED 10G is inserted into the second LED accommodation recess 7, and one is inserted into the third LED accommodation recess 7. Of blue LEDs 10B,
In the second embodiment shown in FIG. 5, three convex portions 6 on the rear surface of the light guide member 5a are formed side by side in the width direction of the incident end face of the light guide plate 3 (the thickness direction of the light guide plate 3). In the third embodiment shown in FIG. 6, three convex portions 6 on the rear surface of the light guide member 5a are formed side by side in the length direction of the incident end face of the light guide plate 3.

The light guide member 5a is provided with the first
The light guide member 5 of the second embodiment has a shape obtained by cutting the light guide member 5 into a length substantially equal to the width thereof, and the shapes of the three convex portions 6 on the rear surface and the side surfaces 8 are the same as those of the first embodiment. The light emitting member 5 has the same curved surface as the light member 5, and the front emission surface 9 is the same flat surface as the light guiding member 5 of the first embodiment.

The red LED 10R and the green LED
10G and the blue LED 10B are mounted on a common support member 11a having substantially the same size as the emission surface 9 of the light guide member 5a, corresponding to the LED housing recesses 7 of the three protrusions 6 of the light guide member 5a. Have been.

In the second embodiment shown in FIG. 5,
Red, green, blue LEDs 10R, 10G, 10B,
The light guide plate 3 is attached to the support member 11a side by side in the width direction of the incident end face (thickness direction of the light guide plate 3). In the third embodiment shown in FIG.
R, 10G, and 10B are attached to the support member 11a side by side in the length direction of the incident end face of the light guide plate 3.

The support member 11a is formed of a wiring board on which connection wirings (not shown) for the red, green, and blue LEDs 10R, 10G, and 10B are formed.
The EDs 10R, 10G, and 10B are attached to the support member 11a by soldering their terminal electrodes to the wiring.

The support member 11a is provided behind the light guide member 5a with the three color LEDs 10R, 10G,
10B are arranged in a state where they are inserted into the LED housing concave portions 7 of the three convex portions 6 of the light guide member 5a, and are detachably attached to a support member attaching portion (not shown) by means such as screws.

Further, a diffusion layer 12 is provided on the emission surface 9 of the light guide member 5, and a transparent protective sheet 15 is provided on the front surface of the diffusion layer 12. The diffusion layer 12 is formed of a particle layer in which transparent spherical particles having a diameter of 4 μm to 40 μm are densely arranged over the entire emission surface 9. The spherical particles are different from the spherical particles in light refraction. It is attached to the light exit surface 9 by a transparent adhesive having a different ratio.

Light source element 4 of the second and third embodiments
a, three convex portions 6 on the rear surface of the light guide member 5a.
The red LED 10R, the green LED 10G, and the blue LED 10B that are inserted into the LED housing recess 7 of
Green and blue light respectively enter the light guide member 5a from the LED housing recess 7 and travel straight through the light guide member 5a, or on the surface and both side surfaces 8 of the convex portion 6. The light guide member 5a is mixed with each other while refracting and traveling.
Out of the light exit surface 9 on the front surface of the
The red LED 10R, the green LED 10G, and the blue LE
The red, green, and blue lights emitted by D10B can be almost completely mixed in color, and most of the emitted light can be emitted as white light.

Further, the light source element 4a is connected to the red L
ED10R, green LED10G and blue LED10B
Of the three convex portions 6 on the rear surface of the light guide member 5a.
Since the LED 10 is inserted into the ED accommodating recess 7, the LED 10
R, 10G, and 10B can be easily replaced. Therefore, even if any one of the three-color LEDs 10R, 10G, and 10B has an emission failure, the white light emission function can be achieved by replacing only those LEDs. Can be recovered.

The light source element 4a of the second and third embodiments has a block-shaped light guide member 5a. This light source element 4a is incident on the light guide plate 3 as shown in FIG. By arranging multiple pieces in the length direction of the end face,
Light can be incident on the light guide plate 3 from substantially the entire area of the incident end face, and the light can be emitted from the entire front surface of the light guide plate 3.

In the light source element 4a of the second and third embodiments, the light exit surface 9 of the light guide member 5a is formed in a substantially square shape. The light guide plate 3 may be formed in a horizontally long rectangular shape whose width is substantially the same as the thickness of the light guide plate 3 and whose horizontal width is slightly larger than the vertical width.

Further, the exit surface 9 of the light guide member 5a is
The light guide member 5a may be formed into a circular or horizontally long elliptical shape. In this case, both sides of the light guide member 5a may be formed in a shape curved in the circumferential direction of the light guide member 4a in the same manner as the outer shape of the emission surface 9. Good.

The light source element 4 of the present invention can be widely used as a light source element of an optical device requiring white light, not limited to a backlight of a display device.

[0060]

The light source element of the present invention has three convex portions on the rear surface, each of which has a curved surface. LED convex portions are provided at the tops of these convex portions, and both side surfaces are provided. A light guide member formed on a curved surface, a front surface of which is formed on an emission surface for emitting light incident from each of the three convex LED housing concave portions, and an LED housing concave portion of the three convex portions of the light guide member; Red LE inserted respectively
D, a green LED and a blue LED, and a diffusion layer provided on an emission surface of the light guide member and diffusing light emitted from the emission surface.
And red, green, and blue light emitted by the green LED and the blue LED can be almost completely mixed, and most of the emitted light can be emitted as white light. Even when a light emission failure occurs, the function of emitting white light can be restored by replacing only the LED.

[0061] In the light source device of the present invention, the diffusion layer is preferably a particle layer in which transparent spherical particles are densely arranged over the entire light exit surface of the light guide member. In this case, the spherical particles are the same as the spherical particles. The light emitted from the emission surface of the light guide member is attached to the emission surface of the light guide member by a transparent adhesive or an adhesive having a different refractive index of light, so that the spherical particles and the adhesive material It is possible to emit white light in which red, green and blue lights are more completely mixed by being scattered by the interface and mixed effectively.

Further, the diameter of the spherical particles is from 4 μm to
The diameter of the spherical particles is desirably 40 μm, and by reducing the diameter of the spherical particles in this manner, white light having high light scattering properties and uniform luminance distribution over a wide emission angle range can be emitted.

Preferably, the red LED, the green LED, and the blue LED are mounted on a common support member disposed on the rear side of the light guide member. In this manner, the three color LEDs 10R, 10G are provided. , 10B can be simplified as compared with the case of individually supporting them.

[Brief description of the drawings]

FIG. 1 is a sectional view of a light source device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a light guide member and an LED support member of the light source element.

FIG. 3 is a side view of a display device using a backlight having the light source element.

FIG. 4 is a perspective view of a backlight provided with a light source element according to the second or third embodiment of the present invention.

FIG. 5 is an exploded perspective view of a light source element showing a second embodiment of the present invention.

FIG. 6 is an exploded perspective view of a light source element showing a third embodiment of the present invention.

[Explanation of symbols]

 4, 4a: Light source element 5, 5a: Light guide member 6: Convex part 7: LED housing recess 8: Light guide member side face 9: Outgoing surface 10R: Red LED 10G: Green LED 10B: Blue LED 11, 11a: Support member 12: diffusion layer 13: spherical particles 14a, 14b: adhesive 14: protective sheet

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H01L 33/00 F21Y 101: 02 // F21Y 101: 02 G02F 1/1335 530

Claims (4)

[Claims] 1. A rear surface having three convex portions each having a curved surface, a concave portion for accommodating a light emitting diode is provided on each of the convex portions, and both side surfaces are each formed on a curved surface. A light guide member having an emission surface for emitting light incident from the light-emitting diode housing recesses of the three protrusions, respectively, and inserted into the light-emitting diode housing recesses of the three protrusions of the light guide member, respectively. A light source device comprising: a red light emitting diode, a green light emitting diode, and a blue light emitting diode; and a diffusion layer provided on an emission surface of the light guide member and diffusing light emitted from the emission surface. 2. The diffusion layer comprises a particle layer in which transparent spherical particles are densely arranged over the entire light exit surface of the light guide member.
The light source device according to claim 1, wherein the spherical particles are attached to an emission surface of a light guide member by a transparent adhesive or an adhesive having a different refractive index of light from the spherical particles. 3. The light source device according to claim 2, wherein the diameter of the spherical particles is 4 μm to 40 μm. 4. The light emitting diode according to claim 1, wherein the red light emitting diode, the green light emitting diode, and the blue light emitting diode are mounted on a common support member disposed behind the light guide member. The light source element according to item 1.