JPH08248418A - Back light, liquid crystal display device and display device - Google Patents

Abstract

PURPOSE: To suppress the degradation in the luminance at the ends of a light transmission plate and to improve the luminance uniformity of its display surface. CONSTITUTION: This device includes a light transmission body 13, an L-shaped fluorescent lamp 14 which makes the display surface 13a of this light transmission body 13 to emit light to a surface form by illuminating the light transmission body 13 from the lateral side of its end face and light source receiving parts 35, 36 which are projectingly provided with a pair of projecting parts 35a and 35b, 36a and 36b which hold the fluorescent lamp 14 in a diametral direction and are formed by shifting either of a pair of the projecting parts 35a and 35b, 36a and 36b in the axial direction of the fluorescent lamp 14 at the end face of the light transmission body 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCD (liquid crystal display device).
The present invention relates to a backlight for illuminating the back surface of a panel and the like, a liquid crystal display device having the backlight, and a display device.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of backlight, there is one described in JP-A-5-196820. This is on the end face of the light guide plate 1 as shown in FIG.
A plurality of pairs of upper and lower claws 3a and 3b that receive the outer surface of the fluorescent lamp 2 at both ends in the diametrical direction are projected so as to accurately position the mounting position of the fluorescent lamp 2 on the light guide plate 1 so that the light guide plate 1 is incident. It is designed so that the direction and the amount of the emitted light are accurately maintained.

[0003]

However, even if the positioning claws 3a and 3b are integrally formed of the same material as the light guide 1, the positioning claws 3a and 3b are not formed.
Since light is not guided inwardly of the light guide plate 1 due to irregular reflection of incident light on the light guide plate 3b, it is possible to prevent light from entering the end face of the light guide plate 1 and to project on the end face of the light guide plate 1. , The incident area of light on this end face is reduced. Moreover, in the conventional backlight, as shown in FIG. 14, the sealing end portion for sealing the electrode 4 of the fluorescent lamp 2 is received by the pair of claws 3a and 3b in the diametrical direction, so that the brightness of the end portion of the light guide plate 1 is reduced. There is a problem that

That is, since the end portion of the fluorescent lamp 2 which seals the electrode is a low brightness portion called a Faraday dark portion, the amount of light incident on the end surface of the light guide plate 1 from this dark portion is originally small. In addition to this, at the end of the light guide plate 1, on the end face,
Since the pair of claws 3a and 3b are provided so as to be opposed to each other in the diametrical direction of the fluorescent lamp 2 (vertical direction in FIG. 14), the light incident from the fluorescent lamp 2 to the end face of the light guide plate 1 is incident. The area is reduced by the amount by which the pair of claws 3a and 3b is provided. That is, since the pair of claws 3a and 3b block the light incident on the end face of the light guide plate 1, the light guide plate 1 is prevented.
The amount of light incident on the end face of the is further reduced. For this reason, there is a problem that the light emission luminance at the end of the light guide plate 1 further decreases, and the luminance uniformity of the display surface of the light guide plate 1 decreases.

Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to prevent a decrease in the brightness of the end portion of the light guide plate and improve the brightness uniformity thereof. It is to provide a display device and a display device.

[0006]

A backlight according to the invention of claim 1 is provided with a light guide; and an end face of the light guide is illuminated from the side to cause the display surface of the light guide to emit light in a planar manner. A rod-shaped light source; and a light source receiving portion formed by projecting a pair of protrusions for sandwiching the rod-shaped light source in the diametrical direction on the end face of the light guide, and shifting one of the pair of protrusions in the axial direction of the rod-shaped light source; It is characterized by having.

According to another aspect of the present invention, there is provided a backlight comprising a rod-shaped light source, a reflector having an inner surface for reflecting light from the light source to the light guide, and an inner surface of the reflector. And a pressing portion for pressing the outer surface of the rod-shaped light source toward the light source receiving portion side.

The backlight of the third aspect of the invention is characterized in that the rod-shaped light source is bent in an L shape so as to face two adjacent end faces of the light guide.

According to another aspect of the present invention, there is provided a backlight comprising: a light diffuser installed on the surface of a light guide; a prism body installed on the light diffuser; and a prism installed on the prism body. And 2) a light diffuser.
Here, the prism body means a light control body having a light collecting function.

According to a fifth aspect of the present invention, there is provided a backlight which is a conductor for shielding electromagnetic wave noise emitted from a rod-shaped light source;
It is characterized by having.

In each of the above inventions, the rod-shaped light source may be L-shaped or straight, and is not limited to that shape.

A liquid crystal display device according to a sixth aspect of the present invention includes the backlight according to any one of the first to fifth aspects, and a liquid crystal display panel illuminated from the back side by the backlight. It is characterized by

The display device according to the invention of claim 7 is the display device according to claim 1
5. The backlight according to any one of 5 above; and a display plate illuminated by the backlight.

[0014]

In the backlight according to the present invention, the rod-shaped light source is pinched at a predetermined position by the pair of protrusions protruding from the end face of the light guide, so that the rod-shaped light source is accurately positioned with respect to the light guide. Can be positioned. Therefore, the direction and the amount of light incident on the light guide can be maintained exactly as designed.

Moreover, since one of the pair of protrusions is displaced in the axial direction of the rod-shaped light source, the pair of protrusions is provided on the end face of the light guide, and the dark portion of the rod-shaped light source is formed in the pair of protrusions. Even if it is received by, it is not necessary to project only one of the pair of protrusions on the end face of the light guide, and the other end does not need to project at the end. The area can be expanded. This increases the amount of light that is incident on the end face of the light guide from the rod-shaped light source,
It is possible to suppress the decrease in the brightness of the end portion of the light guide and increase the brightness uniformity of the planar display surface.

According to the second aspect of the present invention, since the rod-shaped light source is sandwiched between the light source receiving portion and the pressing portion of the reflector, it is possible to effectively prevent the rod-shaped light source from being displaced from a predetermined mounting position.

According to the third aspect of the invention, since the rod-shaped light source is L-shaped, a pair of projections of the light source receiving portion may be provided at both ends in the axial direction of the rod-shaped light source. It is not necessary to provide them at both ends, and the number of these pair of protrusions can be reduced.

These protrusions inhibit the incidence of light from the rod-shaped light source and reduce the incident area of light. However, since these protrusions can be reduced,
Higher brightness can be achieved.

According to a fourth aspect of the present invention, the light emitted from the planar display surface of the light guide is first diffused by the light diffuser, and further the light which leaks outward due to the light diffusion is condensed by the prism body. Then, the leak light is reduced, and the condensed light is diffused again by the second light diffuser, so that the color unevenness due to the color difference due to the prism body can be reduced.

According to the fifth aspect of the present invention, since electromagnetic wave noise radiated from the rod-shaped light source is shielded by the conductor, it is possible to effectively prevent static electricity from being charged on, for example, the rod-shaped light source or a reflector containing the rod-shaped light source. it can.

Therefore, since the static electricity is charged on the rod-shaped light source or the reflector, dust is adsorbed by the static electricity to the light-emitting outer surface of the rod-shaped light source or the reflecting surface of the reflector to be contaminated, and the luminous efficiency and the reflection efficiency are lowered. Can be prevented.

Since the liquid crystal display device of the invention of claim 6 comprises any of the backlights of the inventions of claims 1 to 5, it is the same as the invention of any one of claims 1 to 5. Play an action.

Since the display device of the invention of claim 7 comprises any of the backlights of the inventions of claims 1 to 5, the invention of any one of the backlights of the inventions of claims 1 to 5 is provided. And each have the same effect.

[0024]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 13, the same or corresponding parts are designated by the same reference numerals.

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a left side view of FIG. 1, and FIG. 3 is a partially exploded perspective view thereof. In these figures, the backlight 11 is shown in FIGS. As shown in FIG. 5, a housing recess 12a is formed on one surface of the white resin light case 12, and a rectangular plate-shaped light guide 13 made of acrylic resin or the like and the light guide 13 are formed in the recess 12a. For example, an L-shaped fluorescent lamp 14 is arranged in an L shape at each of the left end and the front end in FIG.
4 and the L-shaped lamp case 15 which is a reflection base made of, for example, ABS (acrylonitrile butadiene styrene) resin and is detachably fitted.

That is, as shown in FIG. 3, a substantially L-shaped fluorescent lamp 14 is provided on the outer side of each of the left end and the front end of the light guide body 13 in the figure, with a slight gap therebetween, and the entire fluorescent lamp 14 is included. L
A lamp case 15 having a substantially U-shaped cross section is arranged, while a rectangular light diffuser plate 16 is directly placed on the display surface 13a on the upper surface of the light guide 13 as shown in FIG. It is adapted to be fitted into the accommodation recess 12 a of the light case 12.

The light guide 13 is integrally provided with engaging protrusions 17a and 17b, which are fitted into the U-shaped opening end of the lamp case 15, at the left end of the upper side face and the lower end of the right side face in FIG. It is protruding.

Further, the light guide body 13 has locking projections 18a on the upper side surface and the right side surface thereof at substantially intermediate portions in the respective longitudinal directions.
18b are formed integrally with each other, and are formed on the side reflection surface 19 by applying white paint or the like. Further, a bottom surface reflecting surface 20 is formed on the outer bottom surface of the light guide 13 by applying a reflective material such as white paint in a dot shape, for example, and the dot densities are sparsely and distant in the vicinity of the fluorescent lamp 14. Therefore, the luminance uniformity of the display surface 13a is improved by setting the density so as to be dense.

On the other hand, the lamp case 15 is divided into a substantially L-shaped vertical portion 15a and a horizontal portion 15b as shown in FIG. 3, and the bent right end 15a1 of the vertical portion 15a is closely connected to the left end 15b1 of the horizontal portion 15b. And is arranged in an L shape.

Then, both lamp cases 1 in the vertical and horizontal parts
5 is made of, for example, black ABS resin, and its arcuate inner surface 21 is uniformly coated with metal of, for example, Cu, Ni, Cr alloy over its entire length to form a reflecting surface. For this metal plating, in addition to the above alloys, Ag, Ni, A
At least one of l and Au or an alloy in which these are appropriately combined may be used. The plating reflecting surface 21 is grounded to reduce noise such as electromagnetic noise.

Further, as shown in FIG. 6, the lamp case 15 has a fitting step for fitting the outer edge portion of the light diffusing plate 16 into the upper inner surface of the opening end portion which is externally fitted to the end portion of the light guide 13. While forming the portion 22, a plurality of concave step portions 23 are formed in the vertical and horizontal portions 15a and 15b, respectively, as shown in FIG.

Further, as shown in FIG. 3, the lamp case 15 is fitted to the vertical portion 15a of the lamp case 15 at the upper left end of the light guide 13 when it is fitted onto the left end of the light guide 13 at a predetermined mounting position. A locking tongue piece 24a that is locked on the locking projection 17a is integrally provided. Similarly to this, the lamp case lateral part 15
Also on b, a locking tongue piece 24b that is locked to the locking projection 17b at the lower right end of the light guide 13 is integrally provided.

On the other hand, as shown in FIGS. 4 and 5, the light case 12 has a rectangular accommodating recess 12a1 for accommodating the light guide 13 in the accommodating recess 12a, and the outer periphery of the left and lower sides of the recess 12a1. Lower, vertical part 1 of the lamp case 15
An L-shaped accommodating recess 12a2 into which the 5a and the lateral portion 15b are fitted is formed. Small cutouts 25a and 25b into which the locking projections 17a and 17b at the upper left end and the lower right end of the light guide 13 are fitted respectively at the upper left end and the lower right end in FIG. 4 of the rectangular housing recess 12a1. Is forming.

The light case 12 is the lamp case 1.
As shown in FIG. 6, on the side wall of the L-shaped accommodating recess 12a2 for accommodating 5, the elastic inward locking claws 26 engageably and disengageably engage with the concave stepped portions 23 of the vertical and horizontal portions 15a and 15b of the lamp case. Are integrally formed. As shown in FIG. 6, the upper surface of the head of each inward locking claw 26 is formed into an arcuate inclined surface 26a that descends inward, and the lower bottom surface of the lamp case 12 is abutted on this inclined surface 26a to strongly push downward. When pressed, the upper portions of the locking claws 26 are elastically bent outward by being guided by the inclined surface 26a to press the lamp case 12 down, and the locking claws 26 are inserted into the engaging step 23. Are designed to fit together.

Then, as shown in FIG. 4, the light case 1
A pair of movable tongues 27, 2 are provided on the upper side of 2 and the inner wall of the right side.
8 forming. That is, the upper and right sides of the flange 12b of the light case 12 are provided with through-holes 29 and 30 which are substantially rectangular and which are integrally formed with arcuate notches outwardly projecting in the longitudinal middle portion thereof. These through holes 29, 3
The movable tongues 27 and 28 having an L-shaped vertical cross-section are integrally formed in 0.

Therefore, a finger is inserted into the arcuate portion of each through hole 29, 30 to push in each movable tongue piece 27, 28 inward and slide over each semi-circular locking projection 31 to get over. As a result, as shown in FIG. 7, the movable tongues 27, 28 press the upper surfaces of the locking projections 18a, 18b of the light guide 13,
It is designed to prevent jumping out.

Then, as shown in FIG. 3, a prism sheet 32 and a diffusion sheet 33, which is a second light diffuser, are placed and fixed on the diffusion plate 16 sequentially and concentrically in this order. A liquid crystal display device is configured by mounting, for example, a liquid crystal panel 34 on 33.

Therefore, after the light emitted from the display surface 13a of the light guide body 13 is diffused by the first light diffusing plate 16 to increase the luminance uniformity, the light which leaks to the outside is diffused by the prism sheet 32. , In front of it (upward in Fig. 3)
The light is evenly focused on the light, and this light is further diffused by the diffusion sheet 33 to enhance the brightness uniformity. Also,
Since light diffused by the prism sheet 33 is diffused and mixed again by the diffusion sheet 33, it is possible to reduce or effectively prevent color unevenness in appearance such as an oil surface due to color difference due to the prism sheet 33. In addition to this, since the diffusion sheet 33 is provided on the prism sheet 32, minute scratches and non-uniform wave shapes on the prism sheet 32, and foreign substances adhering to the sheet are reduced or effectively prevented. be able to.

As shown in FIGS. 3 and 8, the light guide 13 faces the L-shaped fluorescent lamp 14 and is adjacent to each other.
Two sets of light source receiving portions 35 and 36 are provided so as to project at the end portions of the end faces.

The respective light source receiving portions 35 and 36 are the fluorescent lamps 14.
A pair of upper and lower projections 35a, 35b, 36a, 36b sandwiched in the diametrical direction at both axial ends are integrally formed by integral molding or the like. As shown in FIG. 9, the protrusions 35a, 35b, 36a, 36b of each pair project in a circular arc shape outward from a vertical central axis Ov that passes through the center of the fluorescent lamp 14 in the vertical direction, and the tips of the protrusions 35a, 35b, 36a, 36b. The space is slightly opened vertically. Therefore, these protrusions 35a, 3
By strongly pushing the fluorescent lamp 14 into the openings 5b, 36a, and 36b from the direction perpendicular to the axis, the openings can be elastically expanded and inserted into the inside. As a result, the fluorescent lamp 14 is received at a predetermined position and the positioning with the light guide 13 is accurately maintained.

As shown in FIG. 10, one of the pair of upper and lower protrusions 35a, 35b, 36a, 36b, for example, the upper and lower protrusions 36a, 35b in FIG. It is slightly shifted inward.

That is, since both ends of the fluorescent lamp 14 in the axial direction are ends for sealing the electrodes 14a, respectively, and are low-brightness portions called Faraday dark portions, the protrusions 35 of each pair.
By shifting one of a, 35b, 36a, and 36b toward the bright portion inward of the fluorescent lamp 14 in the axial direction, the light incident area at the end facet of the light guide 13 is enlarged, and thus the light guide 13 The luminance reduction at the end of the display surface 13a is suppressed to improve the luminance uniformity of the display surface 13a.

11 (A) and 11 (B) respectively show the essential parts of another embodiment of the present invention. In the embodiment shown in FIG. 11 (A), the projections 35a, 35b, 36a, 36b of each pair are formed. This is characterized in that arcuate cutouts 37a and 37b are formed on a part of the inner surface of the fluorescent lamp 14 that contacts the outer surface thereof.

The arcuate notches 37a, 37b increase the elasticity of the protrusions 35a, 35b, 36a, 36b, so that the fluorescent lamp 14 can be easily pushed into the protrusions 35a, 35b, 36a, 36b. In addition, since the contact area between these and the outer surface of the fluorescent lamp 14 can be reduced, it is possible to reduce the amount of heat conducted by the heat generation of the fluorescent lamp 14 to the light guide 13.

In the embodiment shown in FIG. 11B, each of the projections 3 is
Attach the tips of 5a, 35b, 36a, and 36b to the fluorescent lamp 1.
4 is slightly inward of the vertical central axis Ov, that is, the light guide 13
The small small projections 35c, 35
In the case of forming d, 36c, 36d, an arc-shaped lamp retainer 38 is projected on the inner surface of the lamp case 15, and the lamp retainer 38 and the short and small projections 35c, 35d, 36c, 3 are formed.
It is characterized in that the outer surface of the fluorescent lamp 14 is sandwiched by 6d from three directions.

FIG. 12 is an exploded perspective view of an essential part of still another embodiment of the present invention. In this embodiment, two straight tube fluorescent lamps 39 and 40 are used as a light source and a short plate-shaped guide lamp is used. Light body 41
Is an embodiment in which it is attached to the left and right side end faces in the figure, and the upper and lower sides of the left and right side end faces of the light guide body 41 are sandwiched at the front and rear ends in the figure from the diametrical direction. A pair of arc-shaped projections 42a and 42b are integrally provided to project, and one of them, for example, 42a or 42b, is provided with a fluorescent lamp 39,
The feature is that they are slightly shifted inward in the axial direction of 40 toward the bright part.

Therefore, also in this embodiment, one of the pair of upper and lower projections 42, 42b is displaced inward from the end face of the light guide 41, so that the end face of the light guide 41 is formed. By enlarging the area of the light incident surface at and increasing the amount of incident light here, it is possible to suppress the decrease in the brightness of the end portion of the light guide body 41 and improve the brightness uniformity of the display surface 13a. it can.

FIG. 13 is a vertical cross-sectional view of a main part of still another embodiment of the present invention, in which a transparent conductive film 44 is provided on the inner reflection surface 21 of the light case 15 by, for example, a transparent double-sided tape 43. It is characterized in that it is fixed and at least a part of the outer periphery of the electrode sealing end of the fluorescent lamp 14 is surrounded by the conductive film 44, and the conductive film 44 is grounded.

Therefore, due to the high potential of the pair of electrodes 14a of the fluorescent lamp 14 or the discharge of the electrodes 14a, the outer surface of the fluorescent lamp 14 such as the electrode sealing end portion or the light case 1 is formed.
Electrostatic charges that are charged and accumulated on the reflecting surface 21 and the like of No. 5 can be grounded by the conductive film 44. For this reason, the fluorescent lamp 14 and the reflective surface 21 of the light case 15 are charged, and the accumulated electrostatic charges cause dust to be adsorbed to the outer surface of the fluorescent lamp 14 and the reflective surface 21 of the light case 15 to cause blackening and the like. Therefore, it is possible to effectively prevent the reduction of the luminance and the reflection efficiency. In addition, electromagnetic noise emitted from the fluorescent lamp 14 can be reduced. The liquid crystal display panel 34 shown in FIG. 1 can be configured as a display device by substituting a translucent guide display plate, a signboard, or the like.

[0050]

As described above, according to each of the first to fifth aspects of the invention, the rod-shaped light source is sandwiched at a predetermined position by the pair of protrusions projecting from the end face of the light guide, so that the rod-shaped light source is guided. It is possible to accurately position the optical body. Therefore, the direction and the amount of light incident on the light guide can be maintained exactly as designed.

Moreover, since one of the pair of protrusions is displaced in the axial direction of the rod-shaped light source, the pair of protrusions is provided on the end face of the light guide, and the dark portion of the rod-shaped light source is formed in the pair of protrusions. Even if it is received by, it is not necessary to project only one of the pair of protrusions on the end face of the light guide, and the other end does not need to project at the end. The area can be expanded. This increases the amount of light that is incident on the end face of the light guide from the rod-shaped light source,
It is possible to suppress the decrease in the brightness of the light guide end portion and increase the brightness uniformity of the planar display surface.

According to the second aspect of the present invention, since the rod-shaped light source is sandwiched between the light source receiving portion and the pressing portion of the reflector, it is possible to effectively prevent the rod-shaped light source from being displaced from a predetermined mounting position.

According to the third aspect of the present invention, since the rod-shaped light source is L-shaped, a pair of projections of the light source receiving portion may be provided at both ends of the light source in the axial direction. It is not necessary to provide them at both ends, and the number of these pair of protrusions can be reduced.

These protrusions inhibit the incidence of light from the rod-shaped light source and reduce the incident area of light. However, since these protrusions can be reduced,
Higher brightness can be achieved.

According to a fourth aspect of the present invention, the light emitted from the planar display surface of the light guide is first diffused by the light diffuser, and further the light leaking outward due to this light diffusion is condensed by the prism body. Then, the leak light is reduced, and the condensed light is diffused again by the second light diffuser, so that the color unevenness due to the color difference due to the prism body can be reduced.

Since the electromagnetic wave noise radiated from the rod-shaped light source is shielded by the conductor in the invention of claim 5, it is possible to effectively prevent static electricity from being charged on the rod-shaped light source or a reflector containing the same. it can.

Therefore, since the static electricity is charged on the rod-shaped light source, the reflector, etc., dust is adsorbed by the static electricity to the light-emitting outer surface of the rod-shaped light source and the reflecting surface of the reflector to be contaminated, and the luminous efficiency and the reflection efficiency are lowered. Can be prevented.

Since the liquid crystal display device of the invention of claim 6 is equipped with the backlight of any one of the inventions of claims 1 to 5, it is the same as the invention of any one of claims 1 to 5, respectively. Produce an effect.

Since the display device of the invention of claim 7 comprises any of the backlights of the inventions of claims 1 to 5, the same effects as those of the invention of any one of claims 1 to 5 are provided. Play.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a backlight according to the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is an exploded perspective view of essential parts of the embodiment shown in FIG.

FIG. 4 is a plan view of the light case shown in FIG.

FIG. 5 is a side view showing a part of the light case shown in FIG. 4 in a vertical section.

6 is a partial vertical cross-sectional view of the embodiment shown in FIG.

7 is a sectional view taken along line VII-VII of FIG.

8 is an enlarged perspective view of the light guide body shown in FIG.

FIG. 9 is a longitudinal sectional view of a main part of the embodiment shown in FIG.

FIG. 10 is a front view of a main part of the embodiment shown in FIG.

11 (A) and 11 (B) are vertical cross-sectional views of main parts of another embodiment of the present invention.

FIG. 12 is a perspective view of a main part of still another embodiment of the present invention.

FIG. 13 is a longitudinal sectional view of a main part of another embodiment of the present invention.

FIG. 14 is a partial front view of a conventional example.

[Explanation of symbols]

Reference Signs List 11 backlight 12 light case 12a housing recess 12a1 rectangular housing recess 12a2 L-shaped housing recess 12b flange 13,41 light guide 13a display surface 14,39,40 fluorescent lamp 15 lamp case 15a lamp case vertical section 15b lamp case lateral section 16 Light diffusing plates 17a, 17b Engaging protrusions 18a, 18b Engaging protrusions 19 Side reflection surface 20 Bottom reflection surface 21 Plated reflection surface 32 Prism sheet 33 Diffusion sheet 34 Liquid crystal display panel 35, 36 Light source receiving portion 35a, 35b, 36a , 36b, 42a, 42b Each pair of projections 37a, 37b Arc notch 38 Lamp retainer 43 Double-sided tape 44 Conductive film

Claims (7)

[Claims] 1. A light guide; a rod-shaped light source that illuminates a side surface of an end surface of the light guide so that a display surface of the light guide emits light in a plane; and a bar-shaped light source is provided on an end surface of the light guide. A backlight comprising: a light source receiving portion formed by projecting a pair of protrusions sandwiching in a diametrical direction, and shifting one of the pair of protrusions in the axial direction of the rod-shaped light source; 2. A reflector having on its inner surface a reflection surface for enclosing a rod-shaped light source and reflecting light from the light source to the light guide side; and an outer surface of the rod-shaped light source for receiving the light source provided on the inner surface of the reflector. The backlight according to claim 1, further comprising: a pressing portion that is pressed against the side of the unit. 3. The backlight according to claim 1, wherein the rod-shaped light source is bent in an L shape so as to face two adjacent end faces of the light guide body. 4. A light diffuser installed on the surface of the light guide; a prism body installed on the light diffuser; and a second light diffuser installed on the prism body. The backlight according to claim 1, wherein the backlight is provided. 5. The backlight according to claim 1, further comprising a conductor that shields electromagnetic wave noise emitted from a rod-shaped light source. 6. A liquid crystal display device comprising: the backlight according to claim 1; and a liquid crystal display panel illuminated from the back surface by the backlight. 7. A display device comprising: the backlight according to claim 1; and a display plate illuminated by the backlight.