JP2007294372A - Surface light source device and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface light source device capable of preventing occurrence of a bright line and a dark line and improving uniformity. <P>SOLUTION: The surface light source device 2 is provided with a light guide plate 4 which is formed in flat plate-shape and has a light-emitting face 4a as a front surface, a reflecting face 4b which is a face opposed to the light-emitting face 4a and reflects light, and an incident face 4c which is a peripheral face to connect the light-emitting face 4a and the reflecting face 4b mutually and in which the light enters, a plurality of point light sources 5b which are provided respectively close to the incident face 4c and emit light to the incident face 4c, a reflecting plate 6 which is formed in flat plate-shape, provided opposed to the reflecting face 4b, and reflects the light emitted respectively from the plurality of point light sources 5b toward the light-emitting face 4a, and a plurality of low reflecting part 6a which have a reflection factor lower than the reflecting plate 6 and are provided at the reflecting plate 6 respectively in proximity to the plurality of point light sources 5b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a surface light source device and a display device including the surface light source device.

  The surface light source device is used as a backlight in a display device such as a liquid crystal display device. In this surface light source device, a point light source such as an LED (light emitting diode) is used in order to reduce the thickness and reduce the power consumption.

In a sidelight type surface light source device, a plurality of point light sources are mounted on a wiring board in a straight line, and these point light sources are installed so as to face the incident surface of a light guide plate (for example, Patent Documents). 1 and Patent Document 2). In the vicinity of the point light source, the front part of the light exit surface of the point light source is bright and the space between the point light sources is dark, so that bright lines and dark lines are generated, resulting in poor uniformity. Here, for the purpose of reducing luminance unevenness, a technique has been proposed in which an optical element having a diffraction pattern is provided on an incident surface of a light guide plate (see, for example, Patent Document 2).
JP 2001-160312 A JP 2005-78909 A

  However, even when the above-described technique for providing an optical element is used, bright lines and dark lines may occur, and it is difficult to obtain a sufficient level of uniformity.

  The present invention has been made in view of the above, and an object thereof is to provide a surface light source device and a display device capable of preventing the generation of bright lines and dark lines and improving the degree of uniformity.

  A first feature according to an embodiment of the present invention is that the surface light source device is formed in a flat plate shape and has a light emitting surface that is a surface, a reflective surface that faces the light emitting surface and reflects light, and light emission A light guide plate having an incident surface on which light is incident and a peripheral surface that connects the surface and the reflecting surface to each other, and a plurality of points that are provided close to the incident surface and emit light to the incident surface, respectively A light source, formed in a flat plate shape, facing the reflecting surface, reflecting the light emitted from each of the plurality of point light sources toward the light emitting surface, and having a lower reflectance than the reflecting plate; And a plurality of low reflection portions provided on the reflection plate in proximity to the plurality of point light sources.

  A second feature according to the embodiment of the present invention is that, in the surface light source device, the light emitting surface is formed in a flat plate shape, the surface is a light emitting surface, the reflecting surface is a surface facing the light emitting surface and reflects light, and the light emission A light guide plate having an incident surface on which light is incident and a peripheral surface that connects the surface and the reflecting surface to each other, and a plurality of points that are provided close to the incident surface and emit light to the incident surface, respectively The light source is formed in a flat plate shape and is provided so as to be opposed to the reflection surface, and reflects light emitted from the plurality of point light sources toward the light emission surface, and is guided close to each of the plurality of point light sources. It is provided with a plurality of diffuse reflection parts which are provided on an optical plate and diffusely reflect light emitted from a plurality of point light sources.

  According to a third aspect of the present invention, there is provided a planar light source device, wherein the surface light source device is formed in a flat plate shape, and is a light emitting surface that is a surface, a reflective surface that faces the light emitting surface and reflects light, A light guide plate having an incident surface on which light is incident and a peripheral surface that connects the surface and the reflecting surface to each other, and a plurality of points that are provided close to the incident surface and emit light to the incident surface, respectively A light source is formed between the plurality of point light sources and a reflection plate formed in a flat plate shape so as to be opposed to the reflection surface and reflecting the light emitted from the plurality of point light sources toward the light emission surface. And a plurality of reflecting members that respectively reflect the light emitted from the plurality of point light sources and returned from the light guide plate side toward the incident surface.

  A fourth feature according to an embodiment of the present invention is that the display device emits light from the surface light source device according to the first feature, the second feature, or the third feature, and the surface light source device. And a display unit that displays an image by the light that is emitted.

  According to the present invention, generation of bright lines and dark lines can be prevented, and the leveling can be improved.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a display device 1 according to a first embodiment of the present invention includes a surface light source device 2 that emits light and a liquid crystal display unit 3 that is a display unit that displays an image. .

  The surface light source device 2 includes a light guide plate 4 that guides incident light to the liquid crystal display unit 3, a light source unit 5 that emits light to the light guide plate 4, and a light guide plate 4 that emits light emitted from the light source unit 5. A reflection plate 6 that reflects toward the light source, a first diffusion sheet 7 that diffuses the light emitted from the light guide plate 4, a lens sheet 8 that collects the light diffused by the first diffusion sheet 7, and It has the 2nd diffusion sheet 9 which diffuses again the light condensed with lens sheet 8, and back frame 10 and front frame 11 which sandwich and store these members 4-9. The surface light source device 2 functions as a backlight of the liquid crystal display unit 3.

  The light guide plate 4 is formed in a flat plate shape. The light emitting surface 4a which is the surface, the reflecting surface 4b which is a surface facing the light emitting surface 4a and reflects light, and the light emitting surface 4a and the reflecting surface 4b are mutually connected. And an incident surface 4c on which light is incident. The light emitting surface 4a is a surface that emits light incident on the light guide plate 4 from the incident surface 4c, light reflected by the reflective surface 4b, and the like to the outside of the light guide plate 4. The reflecting surface 4b is a surface that reflects the light incident on the light guide plate 4 from the incident surface 4c toward the light emitting surface 4a. The reflection surface 4b is formed by providing a reflection pattern on the flat surface which is the surface of the light guide plate 4 by printing, embossing, sandblasting, or the like. Further, the incident surface 4 c is a surface on which the light emitted from the light source unit 5 enters the light guide plate 4.

  The light source unit 5 includes a wiring board 5a, which is a board, and a plurality of point light sources 5b mounted on the wiring board 5a. The wiring board 5a is formed on one side so that each point light source 5b can be mounted. The point light source 5 b is mounted on the wiring board 5 a so as to be close to the incident surface 4 c of the light guide plate 4. Specifically, as shown in FIGS. 2 and 3, the point light source 5 b has an exit surface S for emitting light, and the exit surface S faces the entrance surface 4 c of the light guide plate 4. Has been placed. The point light source 5 b emits light from the emission surface S toward the incident surface 4 c of the light guide plate 4. For example, an LED (light emitting diode) is used as the point light source 5b.

  The reflection plate 6 is formed, for example, in a sheet shape, and is provided so as to face the reflection surface 4b of the light guide plate 4 and further approach the reflection surface 4b. The reflecting plate 6 reflects the light emitted from the light source unit 5 toward the light emitting surface 4 a of the light guide plate 4. Thereby, the light leaking from the light guide plate 4 is reflected toward the light emitting surface 4a. In addition, the surface at the side of the light guide plate 4 of the reflection plate 6 is formed in, for example, white or a mirror surface.

  The reflecting plate 6 is provided with a plurality of low reflecting portions 6a having a lower reflectance than the reflecting plate 6 so as to be close to the respective point light sources 5b. The low reflection part 6a is located in the front part of the output surface S of the point light source 5b. The low reflection portion 6 a is a through hole formed in the reflection plate 6, for example, a cutout portion, and is formed by cutting a part of the reflection plate 6. The low reflection portion 6a is formed such that the width in the direction in which the point light sources 5b are arranged is substantially the same as the width of the point light source 5b, and the length in the light traveling direction is, for example, 20 mm or less.

  The first diffusion sheet 7 is provided to face the light emitting surface 4 a of the light guide plate 4. On the first diffusion sheet 7, a lens sheet 8 and a second diffusion sheet 9 are provided in that order. The first diffusion sheet 7 and the second diffusion sheet 9 are sheets that transmit and diffuse light emitted from the light emitting surface 4 a of the light guide plate 4. The first diffusion sheet 7 and the second diffusion sheet 9 are formed, for example, by performing dot pattern processing on the surface thereof. The lens sheet 8 is a sheet that collects and transmits the light transmitted through the first diffusion sheet 7.

  Next, the irradiation operation of the surface light source device 2 provided in such a display device 1 will be described.

  The light source unit 5 irradiates the incident surface 4c of the light guide plate 4 with light from each point light source 5b. The light emitted from the light source unit 5 enters the light guide plate 4 from the incident surface 4 c of the light guide plate 4. The incident light is reflected directly or after being reflected by the reflecting surface 4 b of the light guide plate 4, or after being emitted from the light guide plate 4 and reflected by the reflecting plate 6 and again entering the light guide plate 4, and then the light emitting surface of the light guide plate 4. 4a is emitted. Thereby, the light emitting surface 4a of the light guide plate 4 emits light. The light emitted from the light emitting surface 4 a of the light guide plate 4 passes through the first diffusion sheet 7, the lens sheet 8, and the second diffusion sheet 9 and is irradiated on the liquid crystal display unit 3. At this time, the liquid crystal display unit 3 is driven, and a liquid crystal image is displayed on the liquid crystal display unit 3.

  In such an irradiation operation, the light emitted from each point light source 5b travels toward the incident surface 4c of the light guide plate 4 and each low reflection portion 6a. Those lights are reflected toward the light emitting surface 4a by the reflecting surface 4b of the light guide plate 4 and the reflecting plate 6 having the low reflecting portion 6a. At this time, the amount of light reflected by the reflecting plate 6 is reduced in the vicinity of the incident surface 4c by the low reflection portions 6a.

  As a result, as shown by the waveform H1 in FIG. 4, the light intensity in the vicinity of the incident surface 4c on the light emitting surface 4a decreases so as to approach the light intensity in the vicinity of the end surface facing the incident surface 4c. The light intensity difference (luminance difference) that is the difference from the minimum light intensity is K1. Here, as a comparative example, when each of the low reflection portions 6a is not provided on the reflection plate 6, the light intensity in the vicinity of the incident surface 4c is usually high and far from the incident surface 4c as shown by the waveform H2 shown in FIG. The light intensity gradually decreases with time. At this time, the light intensity difference is K2. Therefore, by providing each of the low reflection portions 6a on the reflection plate 6, the light intensity difference is reduced from K2 to K1 (K1 <K2).

  Further, as shown by the waveform H3 in FIG. 5, the amount of reflected light at the front part of the point light source 5b is reduced and the light intensity at the front part of the point light source 5b is reduced, so that the light intensity difference (luminance difference) is K3. Become. Here, as a comparative example, when each of the low reflection portions 6a is not provided on the reflection plate 6, normally, the light distribution is equal to the maximum at the front portion of the point light source 5b as shown by the waveform H4 in FIG. For this reason, the light intensity at the front of the point light source 5b increases, and the light intensity between the point light sources 5b decreases. At this time, the light intensity difference is K4. Therefore, by providing each of the low reflection portions 6a on the reflection plate 6, the light intensity difference is reduced from K4 to K3 (K3 <K4).

  As described above, according to the first embodiment of the present invention, the amount of light reflected by the reflecting plate 6 is guided by providing each of the low reflection portions 6a on the reflecting plate 6 in the vicinity of each point light source 5b. Since it decreases near the incident surface 4c of the light plate 4 and the light intensity difference (luminance difference) of the light emitting surface 4a becomes small, the generation of bright lines and dark lines can be prevented, and the uniformity can be improved. In addition, the amount of reflected light at the front of each point light source 5b is reduced, and the light intensity at the front of each point light source 5b is reduced. Thereby, since the light intensity difference between the front part of each point light source 5b and each point light source 5b is suppressed, generation | occurrence | production of a bright line and a dark line can be prevented reliably, and a degree of uniformity can be improved more.

  In particular, when optical design is performed according to the difference in light intensity, a high degree of uniformity is obtained by combining processing (light diffusion processing) on the bottom surface of the light guide plate 4 serving as the reflecting surface 4b and processing on the reflecting plate 6. Can be easily obtained.

  Moreover, since the low reflection part 6a is a through-hole formed in the reflection plate 6, it is possible to form the low reflection part 6a by cutting off a part of the reflection plate 6, and a special processing technique is used. Since it is not necessary to use, each low reflection part 6a can be easily provided in the reflecting plate 6. FIG.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment and other embodiments described below, the same parts as those in the above-described embodiments are denoted by the same reference numerals, and redundant description is omitted.

  In the second embodiment, as shown in FIGS. 6 and 7, a plurality of high reflection portions 6 b having a higher reflectance than the reflection plate 6 are provided between the low reflection portions 6 a and provided on the reflection plate 6. It has been. The low reflection part 6a and the high reflection part 6b are formed by sticking a sheet-like reflection member on the reflection plate 6, for example.

  As described above, according to the second embodiment of the present invention, the same effect as that of the first embodiment can be obtained. Further, by providing each of the high reflection portions 6b on the reflector 6 by being positioned between the low reflection portions 6a, the amount of reflected light between the point light sources 5b is increased, and the light intensity between the point light sources 5b is improved. . Thereby, since the light intensity difference between the front part of each point light source 5b and each point light source 5b is suppressed, generation | occurrence | production of a bright line and a dark line can be prevented reliably, and a degree of uniformity can be improved more.

  In addition, since the low reflection portion 6 a is a reflection member provided on the reflection plate 6, the low reflection portion 6 a is formed by attaching a reflection member having a reflectance smaller than that of the reflection plate 6 to the reflection plate 6. Since it is not necessary to process the reflecting plate 6, the low reflecting portions 6 a can be easily provided on the reflecting plate 6.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS.

  In the third embodiment, as shown in FIGS. 8 and 9, each low reflection portion 6a is formed corresponding to the directivity of the light emitted from the point light source 5b. The low reflection portion 6 a is configured by a plurality of through holes H <b> 1 provided in the reflection plate 6. These through-holes H1 are formed by cutting off a part of the reflector 6 and are arranged based on the directivity of the light emitted from the point light source 5b.

  As described above, according to the third embodiment of the present invention, the same effect as in the first embodiment can be obtained. Furthermore, since the low reflection part 6a is formed corresponding to the directivity of the light emitted from the point light source 5b, generation of bright lines and dark lines can be surely prevented, and the degree of uniformity can be further improved. .

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS.

  In the fourth embodiment, as shown in FIGS. 10 and 11, a plurality of diffuse reflectors 6c for diffusing and reflecting the light emitted from the respective point light sources 5b are guided close to the respective point light sources 5b. It is provided on the light plate 4. In addition, each low reflection part 6a is not formed in the reflecting plate 6. FIG.

  The diffuse reflection portion 6 c is configured by a plurality of concave portions H <b> 2 provided in the light guide plate 4. These concave portions H2 are respectively formed by performing counterboring processing on the light guide plate 4, and are arranged based on the directivity of light emitted from the point light source 5b. The depth, size, etc. of the recess H2 are set so that the light intensity and the light amount are uniform.

  As described above, according to the fourth embodiment of the present invention, the diffused reflection portions 6c are provided on the light guide plate 4 so as to be close to the respective point light sources 5b, so that the same as in the first embodiment. An effect can be obtained. Furthermore, since the diffuse reflection part 6c is each recessed part H2 each formed in the light-guide plate 4, it is possible to form the diffuse reflection part 6c by carrying out the counterbore process with respect to the reflection plate 6, and is special. Since it is not necessary to use a simple processing technique, each diffuse reflection portion 6c can be easily provided on the light guide plate 4.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIGS.

  In the fifth embodiment, as shown in FIGS. 12 and 13, the diffuse reflection portion 6 c includes a plurality of groove portions H <b> 3 provided in the light guide plate 4. These groove portions H3 are formed by performing groove processing on the light guide plate 4, respectively. Note that the depth of the groove H3, the angle of the inclined surface, and the like are set so that the light intensity and the amount of light are uniform.

  As described above, according to the fifth embodiment of the present invention, the same effect as in the fourth embodiment can be obtained. Furthermore, since the diffuse reflection part 6c is each groove part H3 formed in the light guide plate 4, respectively, it is possible to form the diffuse reflection part 6c by performing groove processing on the reflection plate 6. Since it is not necessary to use a simple processing technique, each diffuse reflection portion 6c can be easily provided on the light guide plate 4.

(Sixth embodiment)
A sixth embodiment of the present invention will be described with reference to FIGS.

  In the sixth embodiment, as shown in FIGS. 14 and 15, a plurality of light beams that are respectively emitted from the point light sources 5 b and returned from the light guide plate 4 side are reflected toward the incident surface 4 c of the light guide plate 4. The reflecting member 11a is provided between the point light sources 5b.

  Each reflecting member 11 a is provided on the front frame 11, and is formed integrally with the front frame 11, for example. That is, when the surface light source device 2 is assembled, these reflecting members 11a are arranged on the front frame 11 so as to be positioned between the respective point light sources 5b.

  Each reflecting member 11 a is formed in a mountain shape toward the incident surface 4 c of the light guide plate 4. That is, each reflecting member 11a is formed in a triangular prism shape and has two inclined surfaces M1 and M2 that are inclined from the point light source 5b side toward the incident surface 4c of the light guide plate 4, respectively. These inclined surfaces M1 and M2 are flat surfaces, curved surfaces, or the like. The inclined surfaces M1 and M2 are formed as regular reflection surfaces or diffusion surfaces.

  Each such reflecting member 11 a reflects the return light from the light guide plate 4 side toward the incident surface 4 c of the light guide plate 4. This return light is emitted from each point light source 5b, reflected by the incident surface 4c of the light guide plate 4, the reflection plate 6 and the like, and returned from the light guide plate 4 side to the point light source 5b side. Since the return light is reflected by the reflecting members 11a toward the incident surface 4c of the light guide plate 4, the amount of light between the point light sources 5b increases near the incident surface 4c of the light guide plate 4, and before each point light source 5b. The difference in light intensity between the light source and each point light source 5b is suppressed.

  As described above, according to the sixth embodiment of the present invention, the same effect as in the first embodiment can be obtained. Furthermore, by providing each reflecting member 11a between each point light source 5b, the light respectively emitted from each point light source 5b and returned from the light guide plate 4 side is reflected toward the incident surface 4c of the light guide plate 4. Therefore, the light quantity between each point light source 5b increases, and the light intensity between each point light source 5b improves. Thereby, since the light intensity difference (luminance difference) between the front part of each point light source 5b and each point light source 5b is suppressed, generation | occurrence | production of a bright line and a dark line can be prevented, and a degree of uniformity can be improved more. In particular, since the difference in light intensity between the front part of each point light source 5b and each point light source 5b becomes small, a phenomenon in which bright and dark spots look like fireflies in the vicinity of the light source part 5 in the lighting state of each point light source 5b. Can be prevented.

  Note that when the number of point light sources 5b is increased and the pitch between the point light sources 5b is narrowed, the light intensity difference between the front part of each point light source 5b and each point light source 5b is suppressed. Since the number of installed light sources 5b increases, the cost of the surface light source device 2 increases. Therefore, the pitch between the point light sources 5b is not narrowed, and the reflection members 11a are provided between the point light sources 5b, thereby suppressing an increase in cost and the front part of the point light sources 5b and the point light sources 5b. Difference in light intensity between the two can be suppressed.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, in the above-described embodiment, the flat surface that is the surface of the light guide plate 4 is formed as the reflective surface 4b. However, the present invention is not limited to this. You may make it form a surface etc. as the reflective surface 4b.

  In the first embodiment described above, the low reflection portion 6a is formed in a rectangular shape. However, the present invention is not limited to this. For example, the low reflection portion 6a is formed in a square shape, a polygonal shape, a circular shape, or an elliptical shape. You may do it.

  In the second embodiment described above, the low reflection portion 6a and the high reflection portion 6b are formed by attaching a sheet-like reflection member to the reflection plate 6. However, the present invention is not limited to this. For example, the low reflection portion 6 a and the high reflection portion 6 b may be formed by printing a reflective paint on the reflection plate 6. Moreover, although the low reflection part 6a is formed in the rectangular shape, it is not restricted to this, For example, you may make it form in square shape, polygonal shape, circular shape, and elliptical shape.

  In the above-described third embodiment, each low reflection portion 6a is configured by each through hole H1 formed in each reflector 6. However, the present invention is not limited to this, and for example, by a recess or a groove. You may make it comprise each low reflection part 6a. Moreover, although the through-hole H1 is formed in circular shape, it is not restricted to this, For example, you may make it form in elliptical shape, square shape, rectangular shape, and polygonal shape.

  In the fourth and fifth embodiments described above, the respective diffuse reflection portions 6c are configured by the respective concave portions H2 formed in the light guide plate 4 or the respective groove portions H3 formed in the light guide plate 4 respectively. Although each diffuse reflection part 6c is comprised, it is not restricted to this, For example, you may make it comprise each diffuse reflection part 6c combining the recessed part H2, the groove part H3, etc. FIG.

  In the sixth embodiment described above, each reflection member 11a is provided on the front frame 11. However, the present invention is not limited to this. For example, each reflection member 11a is connected to the first diffusion sheet 7 or the wiring. You may make it provide in other members, such as the board | substrate 5a.

  Finally, in the above-described sixth embodiment, the reflecting member 11a is formed in a mountain shape toward the incident surface 4c of the light guide plate 4, but is not limited thereto. In particular, the inclined surfaces M1 and M2 are formed so as to be inclined from the point light source 5b side toward the incident surface 4c of the light guide plate 4. However, the present invention is not limited to this. You may make it incline toward the exterior of the surface light source device 2 from the 5b side, respectively.

1 is an exploded perspective view showing a schematic configuration of a display device according to a first embodiment of the present invention. It is a top view which shows schematic structure of the periphery of the light-guide plate of the surface light source device with which the display apparatus shown in FIG. 1 is provided. It is A1-A1 sectional drawing of FIG. It is explanatory drawing for demonstrating the light intensity of the light emission surface of a direction perpendicular | vertical to an entrance plane. It is explanatory drawing for demonstrating the light intensity of the light emission surface of a direction parallel to an entrance plane. It is a top view which shows schematic structure of the periphery of the light-guide plate of the surface light source device with which the display apparatus which concerns on the 2nd Embodiment of this invention is provided. It is A2-A2 sectional drawing of FIG. It is a top view which shows schematic structure of the periphery of the light-guide plate of the surface light source device with which the display apparatus which concerns on the 3rd Embodiment of this invention is provided. It is A3-A3 sectional drawing of FIG. It is a top view which shows schematic structure of the periphery of the light-guide plate of the surface light source device with which the display apparatus which concerns on the 4th Embodiment of this invention is provided. It is B1-B1 sectional drawing of FIG. It is a top view which shows schematic structure of the periphery of the light-guide plate of the surface light source device with which the display apparatus which concerns on the 5th Embodiment of this invention is provided. It is B2-B2 sectional drawing of FIG. It is a disassembled perspective view which shows schematic structure of the display apparatus which concerns on the 6th Embodiment of this invention. It is a top view which shows schematic structure of the periphery of the light-guide plate of the surface light source device with which the display apparatus shown in FIG. 14 is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Surface light source device 3 Display part (liquid crystal display part)
4 Light guide plate 4a Light emitting surface 4b Reflecting surface 4c Incident surface 5b Point light source 6 Reflecting plate 6a Low reflecting portion 6b High reflecting portion 6c Diffuse reflecting portion 11a Reflecting member

Claims (6)

A light emitting surface that is a flat surface, a light emitting surface that is a surface, a reflective surface that is opposed to the light emitting surface and reflects light, and a peripheral surface that connects the light emitting surface and the reflective surface to each other, where light is transmitted. A light guide plate having an incident surface incident thereon;
A plurality of point light sources that are provided close to the incident surface and emit light respectively to the incident surface;
A reflecting plate that is formed in a flat plate shape, is provided to face the reflecting surface, and reflects the light emitted by the plurality of point light sources toward the light emitting surface;
A plurality of low reflection portions provided on the reflection plate in close proximity to the plurality of point light sources, each having a lower reflectance than the reflection plate;
A surface light source device comprising:   The surface light source device according to claim 1, wherein the low reflection portion is formed corresponding to the directivity of the light emitted from the point light source.   The surface light source device according to claim 1, further comprising a plurality of high reflection portions provided on the reflection plate, each having a higher reflectance than the reflection plate and positioned between the plurality of low reflection portions. . A light emitting surface that is a flat surface, a light emitting surface that is a surface, a reflective surface that is opposed to the light emitting surface and reflects light, and a peripheral surface that connects the light emitting surface and the reflective surface to each other, where light is transmitted. A light guide plate having an incident surface incident thereon;
A plurality of point light sources that are provided close to the incident surface and emit light respectively to the incident surface;
A reflecting plate that is formed in a flat plate shape, is provided to face the reflecting surface, and reflects the light emitted by the plurality of point light sources toward the light emitting surface;
A plurality of diffuse reflectors that are provided on the light guide plate in proximity to the plurality of point light sources, respectively, and diffusely reflect the light respectively emitted from the plurality of point light sources;
A surface light source device comprising: A light emitting surface that is a flat surface, a light emitting surface that is a surface, a reflective surface that is opposed to the light emitting surface and reflects light, and a peripheral surface that connects the light emitting surface and the reflective surface to each other, where light is transmitted. A light guide plate having an incident surface incident thereon;
A plurality of point light sources that are provided close to the incident surface and emit light respectively to the incident surface;
A reflecting plate that is formed in a flat plate shape, is provided to face the reflecting surface, and reflects the light emitted by the plurality of point light sources toward the light emitting surface;
A plurality of reflecting members that are respectively provided between the plurality of point light sources, and that respectively reflect the light emitted from the plurality of point light sources and returned from the light guide plate side toward the incident surface;
A surface light source device comprising: A surface light source device according to any one of claims 1 to 5,
A display unit for displaying an image by light emitted from the surface light source device;
A display device comprising:

Images