KR100768028B1 - Image display device and surface light source device - Google Patents

Abstract

A surface light source device for illuminating a display panel or the like of an image display device includes a light guide plate 1, a reflection member 6, and an LED 8. The LED 8 is disposed on the back 7 side of the light guide plate 4, and the emitted light is reflected by the inclined surface 11 formed at the edge portion of the light guide plate 4 and sent into the light guide plate 4. A reflection member 6 is disposed on the inclined surface 11, and the liquid crystal display panel 3 is disposed opposite to the exit surface 5 of the light guide plate 4. The reflecting member 6 has a first portion 6a which is adhered to and fixed to the exit surface 5 and a second portion 6b which is adhered and fixed to the inclined surface 11. An elastic body 12 is disposed between the reflective member 6 and the liquid crystal display panel 3 to bring the second portion 6b of the reflective member 6 into close contact with the inclined surface 11. The reflection member 6 is difficult to peel off, and thus the bonding operation becomes easy. The first part 6a of the reflective member 6 may be fixed to the liquid crystal display panel 3 by bonding.

Image display

Description

Image display device and surface light source device {IMAGE DISPLAY DEVICE AND SURFACE LIGHT SOURCE DEVICE}

1 is an exploded perspective view showing an image display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state before attaching a liquid crystal display panel to a surface light source device according to the first embodiment, showing a cross section taken along the line A-A in FIG.

3 is a cross-sectional view showing a part of the image display device according to the first embodiment.

4 is a plan view showing a light guide plate used in the first embodiment;

Fig. 5 is a side view of the light guide plate shown in Fig. 4, in which Fig. 5A is a front view of the light guide plate from the position of B, and Fig. 5B is a partial side view of the side of the light guide plate obliquely (arrow) from the position of B;

6 is an exploded perspective view showing an image display device according to a second embodiment.

FIG. 7 is a cross-sectional view showing a state before attaching a liquid crystal display panel to a surface light source device in a second embodiment, showing a cross section taken along the line C-C in FIG. 6; FIG.

8 is a partial cross-sectional view for explaining an image display device according to a second embodiment.

9 is a partial cross-sectional view for explaining an image display device according to a third embodiment of the present invention.

10 is a partial cross-sectional view illustrating a conventional liquid crystal display device.

* Description of the symbols for the main parts of the drawings *

1, 21, 41: image display device 2, 22: surface light source device

3, 23, 47: liquid crystal display panel (lighting member) 4, 24, 44: light guide plate

5, 25, 45: exit surface 6, 26, 43: reflective member

6a, 26a, 43a: first part 6b, 26b, 43b: second part

7, 27, 50: Back 8: LED (light source)

10: chamfer (side) 11, 31, 46: inclined surface

12, 32: elastic body 24a: side

28, 52: fluorescent lamp (light source) 42: filler

44a: side

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device and a surface light source device applicable to the image display device, and is applied to an image display device such as a portable telephone or an electronic notebook or a surface light source device used for the image display device.

For example, a liquid crystal display device used as an image display device of a portable telephone is configured to use a liquid crystal display panel as an illuminated member, and to illuminate it with the output light of the surface light source device from the back side.

10 illustrates a conventional configuration of such a liquid crystal display device. The liquid crystal display device 101 is configured by attaching the liquid crystal display panel 107 to the surface light source device 108. The surface light source device 108 includes a light guide plate 102, a fluorescent lamp 104, and a reflector 106. The fluorescent lamp 104 is disposed as a primary light source on the back 103 side of the light guide plate 102, and the light of the fluorescent lamp 104 is supplied to the light guide plate 102.

The light of the fluorescent lamp 104 is first directed to the inclined surface 105 formed at the edge portion of the light guide plate 102, which is reflected there and bent into the light guide plate 102 at almost right angles. The inclined surface 105 is provided with a reflector 106 to prevent light leakage and reinforce reflection.

The liquid crystal display device 101 having such a configuration can easily increase the distance between the fluorescent lamp 104 and the liquid crystal display panel 107 as compared with the case where the fluorescent lamp 104 is disposed on the side surface of the light guide plate 102. Do. Therefore, the heat of the fluorescent lamp 104 is hardly transmitted to the liquid crystal display panel 107, and the occurrence of color deviation of the liquid crystal display panel 107 due to the temperature rise of the liquid crystal display panel 107 is suppressed (Japanese Patent Laid-Open) See Publication No. 4-355428).

However, the light guide plate 102 used in such a configuration is very thin, and the thickness thereof is only about 1.0 mm to 1.5 mm, for example. Therefore, the width of the inclined surface 105 is also very narrow (thin). The light reflection film is used normally for the reflector 106, and this is fixed to the narrow inclined surface 105 by adhesion | attachment.

At this time, the operation | work which cut | disconnects the light reflection film according to the very narrow inclined surface 105, and adhere | attaches this cut | disconnected light reflection film piece to the inclined surface 105 is calculated | required. This operation is difficult and increases the manufacturing cost of the liquid crystal display device 101. Moreover, since the adhesive area of the light reflection film 106 is narrow, it is easy to peel from the inclined surface 105. For example, when the light reflection film 106 is peeled off from the inclined surface 105 even in part, light leaks from the portion to the outside of the light guide plate 102. As a result, the light use efficiency is lowered, resulting in a decrease in luminance.

Accordingly, it is an object of the present invention to solve such problems of the prior art.

The present invention improves the display device and the surface light source device so that the fixing of the reflector provided on the inclined surface for bending the optical path of the light guide plate becomes stable. In addition, the manufacturing process is more convenient than before.

An image display device to which the present invention is applied includes a light guide plate, a light source disposed on the rear side of the light guide plate, and an illumination member disposed on the emission surface side. Here, the light guide plate is formed with an inclined surface that reflects light supplied by the light source from the edge portion of the light guide plate to the inner side of the light guide plate, and a reflecting member is disposed along the inclined surface.                     

According to an improvement according to the present invention, the reflecting member has a first portion adhered to and fixed to either side of the light guide plate and the illuminated member, and a second portion adhered to the inclined surface. An elastic body for pressing the second portion of the reflective member onto the inclined surface is disposed between the reflective member and the illuminated member. Here, the member disposed between the reflective member and the illuminated member may be a filler for pressing the second portion of the reflective member onto the inclined surface.

In addition, the surface light source device to which the present invention is applied includes a light guide plate and a light source disposed on the rear side of the light guide plate, and output light is output from the emission surface of the light guide plate toward the illumination member disposed on the emission surface side. . Here, the light guide plate is formed with an inclined surface that reflects light supplied by the light source from the edge portion of the light guide plate to the inner side of the light guide plate, and a reflecting member is disposed along the inclined surface.

According to an improvement according to the present invention, the reflecting member has a first portion adhered to and fixed to the exit surface of the light guide plate, and a second portion closely adhered to the inclined surface. And an elastic body is fixed to the outer surface side of the 2nd part of a reflection member, when an illumination side member is arrange | positioned on the emission surface of the light guide plate, an elastic body is suppressed by the illumination member, and accordingly, a 2nd part of a reflection member This inclined surface is suppressed by the elastic force of the elastic body.

Embodiment

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail, referring drawings. In addition, the drawings are exaggerated in part as necessary to facilitate understanding.

(1) First embodiment

1-3 is a figure explaining the image display apparatus 1 which concerns on 1st Embodiment of this invention. 1 shows an image display device 1 in an exploded perspective view, and in FIG. 2, a state before mounting the liquid crystal display panel 3 as an illuminated member to the surface light source device 2 is a cross-sectional view along the line AA in FIG. 1. Is shown. 3 is sectional drawing which showed a part of the image display apparatus 1 comprised by attaching the liquid crystal display panel 3 to the surface light source device 2. As shown in FIG.

As shown in these drawings, the surface light source device 2 includes a light guide plate 4, a pair of reflective members 6 and 6 fixed to both ends of the exit surface 5 of the light guide plate 4, and a light guide plate. A light emitting diode (LED) 8 is disposed as a primary light source so as to correspond to the four corners on the rear side 7 side of (4). And the liquid crystal display panel 3 is arrange | positioned facing the exit surface 5, and the image display apparatus 1 is comprised.

The light guide plate 4 consists of transparent materials, such as PC (polycarbonate), PMMA (polymethyl methacrylate), and cycloolefin resin, has a substantially rectangular shape, and the thickness is substantially the same overall.

As shown in detail in Figs. 4 to 5, the light guide plate 4 is cut in an oblique corner, and the inclined surface 11 is formed by cutting the inclined portion (side portion) 10 inclined. The inclination angle θ of the inclined surface 11 is selected so that light emitted from the LED 8 is internally reflected to produce abundant light components that travel in a direction substantially parallel to the exit surface 5.

In addition, in this embodiment, the light emitted from the LED 8 is incident on the light guide plate 4 so as to be substantially orthogonal to the exit surface 5 of the light guide plate 4. Therefore, the inclination angle θ of the inclined surface 11 is about 45 degrees. The reflective member 6 is formed of a film excellent in light reflectivity, such as white PET (polyethylene terephthalate), and silver is deposited on the surface opposite to the light guide plate 4. And an adhesive material is apply | coated to this silver vapor deposition surface.

What is important here is that the reflecting member 6 is provided with the 1st part 6a which adheres and is fixed to the exit surface 5, and the 2nd part 6b which is adhered and fixed to the inclined surface 11, and is. In order for the 1st part 6a to adhere | attach firmly to the exit surface 11, it is preferable that an adhesive area is much larger compared with the 2nd part 6b.

In addition, the second portion 6b of the reflective member 6 is bonded to the inclined surface 11 in a bent state to conform to the shape of the light guide plate 4. However, since the adhesion area with the inclined surface 11 is small and sufficient adhesive strength is hard to be obtained, it is easy to peel off from the inclined surface by the restoring force of the reflective member 6 (refer FIG. 2). Therefore, in this embodiment, the elastic body 12 is fixed to the surface (non-adhesive surface) which opposes the liquid crystal display panel 3 of the 2nd part 6b. This elastic body 12 is suppressed by the liquid crystal display panel 3 attached to the surface light source device 2, and the 2nd part 6b is crimped | bonded by the inclined surface 11 by this.

In this way, the peeling of the second portion 6b from the inclined surface 11 is prevented during use of the image display device 1 or the like. Moreover, the 1st part 6a has tongue pieces 6c in the both ends, respectively, and is trying to increase the adhesive area of the inclined surface 11 vicinity. Thereby, the adhesive strength of the reflection member 6 to the light guide plate 4 becomes high, and the occurrence of peeling of the second part 6b becomes more difficult.

In addition, in this embodiment, the substantially triangular-shaped thing is employ | adopted for the elastic body 12. As shown in FIG. However, this is only an example and there is no restriction | limiting in particular in the shape as long as it can be suppressed by the liquid crystal display panel 3 and the 2nd part 6b can be in close contact with the inclined surface 11. For example, elastic bodies, such as a triangular column shape and a hemispherical shape, can also be employ | adopted. Moreover, as a material of the elastic body 12, polyurethane foam, foam polyolefin, foam rubber, etc. can be illustrated, In general, as long as the 2nd part 6b can be crimped | bonded to the inclined surface 11, a restriction | limiting of a material especially will be carried out. none.

However, in consideration of the load applied to other members such as the liquid crystal display panel 3 and the light guide plate 4, a sponge-like flexible foam is preferable. LED 8 is arrange | positioned in the position corresponding to the back surface 7 side of the light guide plate 4, and also the inclined surface 11 of the light guide plate 4, in other words, the position which opposes the four corners of the back surface 7 side, respectively. It is.

The LED 8 is arranged in a posture to emit light in a direction substantially perpendicular to the emission surface 5. Moreover, the reflective sheet 13 which consists of resin sheets, such as PET which is excellent in light reflectivity, is arrange | positioned at the back surface 7 side. And the notch part 14 which enables the passage of the light radiate | emitted from the LED 8 is formed in the square part of the reflecting sheet 13, respectively. The reflective sheet 13 reflects the light leaked from the back surface 7 and returns to the inside of the light guide plate 4.                     

In addition, when the frame panel which is excellent in light reflection property is arrange | positioned at the back surface 7 side (refer FIG. 9), and the light emitted from the back surface 7 side can be reflected by this frame panel, the said reflection sheet 13 Can be omitted.

In the image display device 1 configured as described above, when the LED 8 is turned on, most of the light is incident on the inside of the light guide plate 4, and then the reflection adhered to the inclined surface 11 or the inclined surface 11. Reflected by the member 6, its traveling direction is changed in a direction substantially parallel to the exit surface 5, and propagates inside the light guide plate 4.

Light propagated inside the light guide plate 4 is given an opportunity to enter the light exiting surface 5 internally. As is well known, most of the components whose incidence angle is an angle below the critical angle at the time of internal incidence into the exit surface 5 escape from the exit surface 5 to the outside. When light is supplied from the four corners of the light guide plate 4, the emission from the emission surface 5 occurs almost evenly, and the luminance is uniformed. In this way, the liquid crystal display panel 3 is uniformly illuminated with the light emitted from the exit surface 5, thereby achieving display of good quality.

As described above, the image display device 1 of the present embodiment includes a first portion 6a to which the reflective member 6 is fixed by being bonded to the exit surface 5, and an agent that is fixed by being attached to the inclined surface 11. The elastic body 12 is fixed to the surface (non-adhesive surface) provided with the 2 part 6b and opposing the liquid crystal display panel 3 of the 2nd part 6b. This elastic body 12 is suppressed by the liquid crystal display panel 3 attached to the surface light source device 2, and the 2nd part 6b adheres to the inclined surface 11 by this.                     

Therefore, as compared with the conventional example in which the reflector 106 adheres only to the inclined surface 105 of the light guide plate 102 and is fixed (see FIG. 10), the adhesion area of the reflective member 6 can be increased, and the reflective member 6 Adhesion fixing operation becomes easy. Moreover, the manufacturing process of the image display apparatus 1 can be simplified than a conventional example. In addition, the situation where the reflecting member 6 is peeled off and causes a decrease in illumination performance is reliably avoided.

In addition, there is no restriction | limiting in particular about the number of formation of the inclined surface 11 of the light guide plate 4, and the number of installation of the LED8. Generally, it changes suitably according to design conditions, such as the effective light emitting area of the light guide plate 4, the mounting space of the image display apparatus 1, and the like.

(2) 2nd Embodiment

6 to 8 show an image display device 21 according to the second embodiment of the present invention. 6 shows an image display device 21 in an exploded perspective view, and in FIG. 7 is a cross-sectional view along the line CC of FIG. 6 before the liquid crystal display panel 23 as a light emitting member is mounted on the surface light source device 22. Is shown. 8, a part of the image display apparatus 21 comprised by attaching the liquid crystal display panel 23 to the surface light source device 22 is shown by sectional drawing.

In this embodiment, the fluorescent lamp 28 is arrange | positioned as the primary light source on the back 27 side of the light guide plate 24, the reflection sheet 33 is arrange | positioned, and the end of the light-emitting plate 24 at the exit surface 25 side. The reflective member 26 is adhered and fixed to the part. The arrangement position of the fluorescent lamp 28 is a position corresponding to the inclined surface 31 on the rear surface 27 side, that is, a position opposite to the end portion of the inclined surface 31 side of the rear surface 27.                     

The liquid crystal display panel 23 is disposed to face the exit surface 25 of the light guide plate 24. The light guide plate 24 is formed so that the thickness of one end thereof is thicker than the other end, the cross-sectional shape along the line C-C in FIG. 6 is almost wedge shaped, and the planar shape is rectangular. PC, PMMA, cycloolefin resin, etc. are employ | adopted for the material.

At one end of the light guide plate 24, an inclined surface 31 such as the side surface 24a is cut out obliquely is formed. The inclination angle θ of the inclined surface 31 with respect to the emitting surface 25 is propagated by the reflection of most of the light emitted from the fluorescent lamp 28 in a direction substantially parallel to the emitting surface 25 of the light guide plate 24. It is set to.

Similar to the first embodiment, the reflecting member 26 is formed of a film having excellent light reflectivity, such as white PET, and silver is deposited on the surface facing the light guide plate 24, and an adhesive material is coated on the silver deposition surface. .

An important feature of this embodiment is that the reflective member 26 is fixed to the inclined surface 31 of the first portion 26a and the inclined surface 31 of the light guide plate 24 by fixing to the exit surface 25 of the light guide plate 24. It is provided with the 2nd part 26b which becomes. The first portion 26a of the reflective member 26 has a larger adhesion area than the second portion 26b and is reliably adhered to the exit surface 25 of the light guide plate 24 to be fixed.

The second portion 26b of the reflecting member 26 is adhered to the inclined surface 31 in a bent state to follow the shape of the light guide plate 24, but since the adhesion area with the inclined surface 31 is small, the reflecting member 26 It is easy to peel from the inclined surface 31 by the restoring force of () (refer FIG. 7).

Therefore, in this embodiment, like the said 1st Embodiment, the elastic body 32, such as a sponge and foam rubber, is stuck to the surface (non-adhesive surface) which opposes the liquid crystal display panel 23 of the 2nd part 26b, The elastic body 32 is pressed by the liquid crystal display panel 23 mounted on the surface light source device 22, and the second portion 26b is pressed against the inclined surface 31 by the elastic body 32. In addition, the elastic body 32 in this embodiment is substantially triangular in cross section, and is formed in the magnitude | size corresponding to the magnitude | size of the inclined surface 31. As shown in FIG.

Moreover, the tongue 26c is formed in the both ends of the reflection member 26, and the adhesive area of the edge part vicinity of the light guide plate 24 is increasing. As a result, the adhesion of the first portion 26a to the light guide plate 24 is reinforced.

In this manner, the second portion 26b is peeled off the inclined surface 31 or the first portion 26a is peeled off from the exit surface 25 during use of the image display device 21 or the like.

When the fluorescent lamp 28 is turned on, the light is incident from the rear face 27 into the light guide plate 24. Therefore, the reflection sheet 33 which consists of resin sheets, such as PET which is excellent in the light reflection property, is arrange | positioned at the back 27 side, and the fluorescent lamp 28 side end part of this reflection sheet 33 is shown in FIG. The light emitted from the fluorescent lamp 28 is cut out so as to be incident on the inclined surface 31 side end portion of the light guide plate 24 (two dashed-dotted edge portion 34 in FIG. 6), so that the back 27 of the light guide plate 24 It is formed smaller than the area. The reflective sheet 33 reflects the light leaked from the back surface 27 and returns to the inside of the light guide plate 24 to prevent the loss of light.

In addition, when the frame panel which is excellent in the light reflection property is arrange | positioned at the back surface 27 side (refer FIG. 9), and when this frame panel can reflect the light radiate | emitted from the back 27 side of the light guide plate 24, The reflective sheet 33 can be omitted.

In the present embodiment, most of the light emitted from the fluorescent lamp 28 is incident on the inside of the light guide plate 24 and then reflected by the inclined surface 31 or the reflective member 26 adhered thereto, and the exit surface ( It propagates inside the light guide plate 24 in a direction substantially parallel to 25). And the light propagated inside the light guide plate 24 is given the opportunity to internally enter the exit surface 25. As is well known, most of the components whose incidence angle is an angle below the critical angle at the time of internal incidence into the exit surface 25 escape from the exit surface 25 to the outside.

In addition, the fluorescent lamp 28 is located on the back 27 side of the light guide plate 24, and the fluorescent lamp 28 is located at a position away from the liquid crystal display panel 23. The heat of the fluorescent lamp 28 is a liquid crystal display. This brings the advantage of being difficult to deliver to the panel 23. Therefore, according to this embodiment, generation | occurrence | production of the color deviation resulting from partial heating of the liquid crystal display panel 23 is prevented, and uniform and high quality image display is attained.

As described above, in the present embodiment, when the liquid crystal display panel 23 is mounted on the emission surface 25 side, the elastic body 32 of the reflective member 26 fixed to the end of the emission surface 25 is the liquid crystal display. It is suppressed by the panel 23, and the elastic body 32 adhere | attaches the 2nd part 26b of the reflection member 26 to the inclined surface 31 reliably. Therefore, the light from the fluorescent lamp 28 is reliably reflected without leaking from the inclined surface 31 to the outside and reliably sent to the inside of the light guide plate 24. Therefore, as compared with the conventional example, the effective utilization rate of the light of the fluorescent lamp 28 can be improved, and the luminance of the emitted light from the light guide plate 24 can be increased.

In addition, in the present embodiment, similarly to the first embodiment, the reflecting member 26 is bonded to the first portion 26a and the inclined surface 31 which are adhered to and fixed to the exit surface 25 of the light guide plate 24. Since the two parts 26b are provided, the adhesive area of the reflecting member 26 is compared with the conventional example (see FIG. 10) in which the reflector 106 is adhered to and fixed only on the inclined surface 105 of the light guide plate 102. I can make it big. As a result, the adhesive fixing operation of the reflective member 26 becomes easy, and the manufacturing process of the image display apparatus 21 can be simplified than the conventional example. Then, the situation where the reflective member 6 is peeled off and the deterioration of the lighting performance is reliably avoided.

In addition, in this embodiment, although the light guide plate 24 which has a substantially wedge-shaped cross section was illustrated, this is only an illustration. For example, a light guide plate having a uniform thickness or a light guide plate having another cross-sectional shape can also be employed.

In this embodiment, although the aspect which arrange | positions the fluorescent lamp 28 only in the one end part on the back 27 side of the light guide plate 24 was illustrated, it is not limited to this, Fluorescence so that it may correspond to at least one side of other three sides. The lamp 28 may be provided and a plurality of fluorescent lamps 28 may be used.

In the present embodiment, the elastic body 32 has a substantially triangular cross section, but this is also merely an example. Generally, what is necessary is just to be suppressed by the liquid crystal display panel 23, and the 2nd part 26b may be in close contact with the inclined surface 31, for example, a semicircular shape etc. may be sufficient as a cross section.

In addition, in this embodiment, as the elastic body 32, polyurethane foam, foam polyolefin, foam rubber, etc. can be illustrated similarly to the elastic body 12 in 1st Embodiment. In general, this material is not particularly limited as long as the second portion 26b can be brought into close contact with the inclined surface 31. However, in consideration of the load on other members such as the liquid crystal display panel 23 and the light guide plate 24, a sponge-like flexible foam is preferable.

(3) Third Embodiment

9 is a partial cross-sectional view for explaining an image display device according to a third embodiment of the present invention. This embodiment is embodiment corresponding to a modified example of the first and second embodiments. That is, the image display apparatus 41 of this embodiment is characterized by using the filler 42 instead of the elastic bodies 12 or 32 employed in the first and second embodiments.

As shown in FIG. 9, the reflecting member 43 has a first portion 43a and a second portion 43b, and the first portion 43a is bonded to the exit surface 45 of the light guide plate 44. , The second portion 43b is bonded to the inclined surface 46. Thereafter, the filler 42 is accommodated in the gap between the frame 48 and the reflecting member 43 that accommodate the light guide plate 44, the liquid crystal display panel (lighted member 47), and the like.

And when the liquid crystal display panel 47 is attached to the frame 48, the reflecting member 43 is in close contact with the inclined surface 46 with the filler 42. As the filler 42, an elastic body such as a sponge or rubber, or a plastic material in the form of a rubber, clay, or gel that can be deformed to fit the shape of the gap can be used.

Here, the frame panel 51 supporting the back surface 50 of the light guide plate 44 is formed of white having excellent light reflectivity, and has a fluorescent lamp (primary light source) opened at its end toward the light guide plate 44 side; The recessed part 53 which accommodates 52 is formed. Further, the inclined surface 46 is formed on the side surface 44a of the light guide plate 44.

This embodiment of such a structure can exhibit the same effect as the said 1st and 2nd embodiment. In each of the above embodiments, the first portions 6a, 26a, 43a of the reflecting members 6, 26, 43 are placed on the emission surface 5, 25, 45 side of the light guide plates 4, 24, 44. Although the aspect which adheres and is fixed is illustrated, this does not limit this invention.

For example, the first portions 6, 26a, 43a of the reflecting members 6, 26, 43 may be adhered to and fixed to the liquid crystal display panels 3, 23, 47 as the illuminated member. In addition, the second parts 6b, 26b, 43b of the reflective members 6, 26, 43 can be brought into close contact with the inclined surfaces 11, 31, 46 by the elastic bodies 12, 32 or the filler 42. If it is, the application of the adhesive to the second portions 6b, 26b, 43b can be omitted as necessary.

In addition, in the said 3rd Embodiment, when the frame panel 51 is not arrange | positioned at the back surface 50 side of the light guide plate 44, it is the back surface 50 of the light guide plate 44 like 1st and 2nd embodiment. The reflection sheet is arrange | positioned at the

In addition, in each said embodiment, although the liquid crystal display device 3, 23, 47 was illustrated as a to-be-illuminated member, this does not limit this invention to a typical example to the last. That is, other arbitrary members irradiated with light emitted from the light guide plates 4, 24, 44, such as diffusion sheets, prism sheets, and the like, are also included in the illuminated member.

As described above, in the present invention, since the reflective member has a first portion adhered to and fixed to the exit surface of the light guide plate and a second portion adhered to the inclined surface, the reflective film (reflective member) adheres only to the inclined surface of the light guide plate. The adhesion area of the reflection member can be increased as compared with the conventional example to be fixed. As a result, the adhesive fixing operation of the reflecting member becomes easy, and the number of steps required for the manufacture of the surface light source device and the image display device including the surface light source device can be reduced compared with the conventional example.

In addition, in the present invention, since the second portion of the reflective member is pressed onto the inclined surface by the elastic member or the filler disposed between the second portion of the reflective member and the illuminated member, the second portion of the reflective member is separated from the inclined surface. The light from the light source can be efficiently incident into the light guide plate without any work.

Claims (3)

And a light guide plate, a light source disposed on the rear side of the light guide plate, and an illumination member disposed on an emission surface side of the light guide plate, wherein the light guide plate receives light supplied by the light source from an edge portion of the light guide plate. In the image display apparatus in which the inclined surface which reflects to the side is formed, and the reflecting member is arrange | positioned along the inclined surface, The reflective member includes a first portion adhered to and fixed to either one of the light guide plate and the illuminated member, and a second portion in close contact with the inclined surface, And an elastic body for pressing the second portion of the reflective member onto the inclined surface between the reflective member and the image display panel. And a light guide plate, a light source disposed on the rear side of the light guide plate, and an illumination member disposed on an emission surface side of the light guide plate, wherein the light guide plate receives light supplied by the light source from an edge portion of the light guide plate. In the image display apparatus in which the inclined surface which reflects to the side is formed, and the reflecting member is arrange | positioned along the inclined surface, The reflective member includes a first portion adhered to and fixed to either one of the light guide plate and the illuminated member, and a second portion in close contact with the inclined surface, An image display apparatus, wherein a filler for pressing the second portion of the reflective member to the inclined surface is disposed between the reflective member and the illuminated member. It has a light guide plate and the light source arrange | positioned at the back side of the said light guide plate, and output light is output from the output surface of the said light guide plate toward the to-be-illuminated member arrange | positioned at the said emission surface side, The said light guide plate is provided with the said light source. In the surface light source device in which the inclined surface which reflects the light supplied by the said light guide plate from the edge part of the said light guide plate is formed, and the reflecting member is arrange | positioned along the inclined surface, The reflective member has a first portion adhered to and fixed to the exit surface, and a second portion in close contact with the inclined surface, An elastic body is fixed to the outer surface side of the second portion of the reflecting member, When the illuminated side member is disposed on the exit surface, the elastic member is suppressed by the illuminated member, so that the second portion of the reflective member is suppressed by the elastic force of the elastic body on the inclined surface. Light source device.

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