JPH087624A - Backlight, display device and liquid crystal display device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a backlight or the like for uniformly illuminating a liquid crystal or the like from the back surface. According to the present invention, a light guide plate, a reflecting means or a first diffusing means arranged on the back surface of the light guide plate, a second diffusing means arranged on the front surface of the light guide plate, a light guiding plate and a reflecting means. Means or first diffusing means, and a recess for accommodating the second diffusing means therein, a case body including a notch formed in a part of the recess, and a light guide plate accommodated in the recess of the case body A lamp arranged in the notch of the case body so as to introduce light into the light guide plate from the side surface of the lamp, and a lead wire derived from the lamp arranged along the outer side surface of the recess of the case body. A lamp lighting means is provided on the side of the concave portion of the case body and to which the lead wire is electrically connected. [Effect] The casing for fixing the lamp lighting means and the case body is not necessary, the number of parts can be reduced, and the cost can be reduced. In addition, the lead wire arrangement structure is simplified,
It is possible to reduce the assembly time for the case body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight suitable for uniformly illuminating liquid crystal display means and the like from the back, a display device using this backlight, and a liquid crystal display device.

[0002]

2. Description of the Related Art Conventionally, as a structure of a backlight, JP-A-3-2788 (hereinafter referred to as "first conventional example") and Japanese Utility Model Laid-Open No. 3-89421 (hereinafter referred to as "second conventional example"). Examples ”)) and the like.

The structure of the first conventional backlight is shown in FIG.
Will be described with reference to. This backlight is a system in which the radiated light of a lamp directly illuminates a liquid crystal panel or the like (hereinafter,
It is called "direct fire method". ). FIG. 7 is an exploded perspective view of the backlight, in which a box-shaped frame 71 is provided with a lamp housing 71a, an inverter circuit, and a cooling fan housing 71b.

The lamp housing portion 71a has a lamp 7
2, 72 are provided, and an inverter circuit 73 and a cooling fan 74 are provided in the inverter circuit and cooling fan housing portion 71b, respectively. Radiating holes 71c, 71c, 71d are formed in the respective storage parts 71a, 71b, and the lamps 72, 72 and the inverter circuit 73 are formed.
The structure is such that the heat generated from the outside is radiated to the outside of the frame 71.

Further, the liquid crystal panel 75 has a frame 71.
The liquid crystal panel 75, the periphery of the liquid crystal panel 75, the inverter circuit 73 and the cooling fan 74 are fixed to the upper part of the panel by a cover 77.

A backlight of the second conventional example is shown in FIG.
Will be described with reference to. This backlight is a system (hereinafter, referred to as a "sidelight system") in which radiated light of a lamp is introduced from a side surface of a light guide plate or the like and radiated from a surface to illuminate a liquid crystal panel. FIG. 8 is a perspective view of the backlight, in which the light guide plate 81 is placed on the frame 82, and the fluorescent tubes 83 are provided on both end surfaces of the light guide plate 81.

The fluorescent tubes 83, 83 are covered with lids 84, 84 fitted in predetermined grooves of the frame 82.
Further, rubber caps 83 are provided on both ends of the fluorescent tubes 83, 83.
a and 83a are attached to protect the ends. Further, the lead wire 83 is connected from both ends of the fluorescent tubes 83, 83.
b and 83b are respectively led out and bundled to form a lead wire group 83c, connected to the connector 85, and connected to a lighting circuit not disclosed.

The lamp shape is characteristic, and
A backlight using an L-shaped fluorescent lamp is disclosed in Japanese Unexamined Patent Publication No. 5-232468 (hereinafter, referred to as “third conventional example”).
Say. ) Etc. This backlight is shown in FIG. In the figure, an L-shaped fluorescent lamp 91 is arranged on the side surface of the light guide plate 92, and a reflective film is provided so as to cover the fluorescent lamp 91.

[0009]

However, the backlight of the first conventional example has a high brightness because it is a direct-lighting type, but there is a problem that the diameter of the lamps 72, 72, the thickness of the frame 71, etc. becomes large. is there.

The frame 71 has lamps 72, 7
2. Since the storage portions 71a and 71b that store the inverter circuit 73 and the cooling fan 74 are arranged in parallel, the lamp 7
2, 72 and the inverter circuit 73 are easily accommodated at the same time, but since the ends of the lamps 72, 72 have to be fixed to the storage portion 71a, a fixing space is required and the storage portion 7
There is a problem that a dead space is formed between 1a and 71b and the frame 71 becomes long in the lateral direction.

Next, in the backlight of the second conventional example, the lead wires 8 led out from both ends of the fluorescent tubes 83, 83.
Since 3b and 83b form a lead wire group 83c and are connected to the connector 85, it is considered that the connector 85 is connected to a lighting circuit formed separately from the frame 81, although not disclosed. , A casing for fixing the lighting circuit to the frame 81 is required, resulting in high cost, the lead wires 83b, 83b and the lead wire group 83c being long, the arrangement structure thereof being complicated, and the assembly time being long. There are issues such as this.

The backlight of the third conventional example is L
The letter-shaped fluorescent lamp 91 is arranged on the side surface of the light guide plate 92, and when this backlight is arranged in the frame 81 disclosed in the second conventional example, there is no portion for arranging the lighting circuit, 81 and a casing for fixing the lighting circuit are required, and there are the same problems as in the case of the backlight of the second conventional example described above.

Therefore, the present invention has been made in consideration of the above circumstances, and in particular, provides a backlight, a display device and a liquid crystal display device having a simple lead wire arrangement structure and easy to assemble. The purpose is to

[0014]

According to another aspect of the present invention, there is provided a backlight comprising: a light guide plate; a reflecting means or a first diffusing means provided on a back surface of the light guide plate; and a first light guide plate provided on a front surface of the light guide plate. 2 diffusing means, a light guide plate, a reflecting means or a first diffusing means,
And a case body containing a recess for accommodating the second diffusing means, and a notch formed in a part of the recess,
A lamp arranged in the notch of the case body so as to introduce light into the light guide plate from the side surface of the light guide plate housed in the recess of the case body, and arranged along the outer side surface of the recess of the case body. Further, it is provided with a lead wire led out from the lamp and a lamp lighting means which is disposed on the side of the recess of the case body and electrically connected to the lead wire.

The reflecting means or the first diffusing means is
The back surface of the light guide plate may be directly provided by processing, or may be provided indirectly by interposing another member between the light guide plate and the back surface.

The second diffusing means may be provided directly by processing the front surface of the light guide plate, or indirectly provided by interposing a separate member between the second light diffusing means and the light guide plate.

The lead wire may have a portion arranged along the outer side surface of the recess of the case body.

According to another aspect of the backlight of the present invention, a quadrangular light guide plate, a quadrilateral reflector or first diffusing means provided on the back surface of the light guide plate, and a quadrangle diffusing plate provided on the front surface of the light guide plate. A plate, a light guide plate, a reflecting means or a first diffusing means, and a quadrangular recess for accommodating the diffusing plate therein, and a case body including cutouts formed on two adjacent sides of the quadrangular recess, An L-shaped lamp arranged in the notch of the case body so as to introduce light into the light guide plate from the side surface of the light guide plate housed in the recess of the case body, and along the outer side surface of the recess of the case body. A lead wire led out from the lamp, and a lamp lighting means, which is arranged on the side of a recess in which a notch is not formed in the case body and electrically connected to the lead wire. It has.

The reflecting means, the first diffusing means, and the diffusing plate may be provided on the light guide plate either directly or indirectly, as described above.

Further, the quadrangle may be a substantially quadrangular shape. That is, the corners of the quadrangle may be rounded or notched.

The lead wire may have a portion arranged along the outer side surface of the recess of the case body.

According to another aspect of the present invention, there is provided a backlight comprising: a light guide plate; a reflecting means or a first diffusing means provided on the back surface of the light guide plate; and a second diffusing means provided on the front surface of the light guide plate. A light guide plate, a reflecting means or a first diffusing means, and a recess for accommodating the second diffusing means inside, a case body including a notch formed in a part of this recess, and a recess for the case body. The lamp is arranged in the notch of the case body so as to introduce light into the light guide plate from the side surface of the light guide plate, and is derived from the lamp arranged along the outer side surface of the recess of the case body. A lead wire and a lamp lighting means which is disposed on the side of the recess of the case main body and electrically connects the lead wire, and one side edge near the lamp is fixed at the bottom of the recess of the case main body. Surrounds the lamp, and the other edge of the light guide plate Others are provided with reflectors disposed on the second diffusion means, one end of which is pivotally mounted rotatably on the case body, and fitted into the cutout portion of the case body and a cover covering the lamp.

The reflecting means, the first diffusing means, or the second diffusing means may be provided on the light guide plate either directly or indirectly, as described above.

The lead wire may have a portion arranged along the outer side surface of the recess of the case body.

A backlight according to a fourth aspect is the backlight according to any one of the first to third aspects, wherein the backlight is provided in a lighting means protection case for fixing the lamp lighting means and a case body for fixing the lighting means protection case. Lighting means locking means. A backlight according to claim 5, a light guide plate, a recess for accommodating the light guide plate therein, a case body including a notch formed in a part of the recess,
A lamp arranged in the notch of the case body so as to introduce light into the light guide plate from the side surface of the light guide plate housed in the recess of the case body, and arranged along the outer side surface of the recess of the case body. In addition, a lead wire led out from the lamp, a lamp lighting means disposed laterally of the recess of the case body, and electrically connected to the lead wire, and one end pivotally attached to the case body, And a cover that fits into the cutout portion of the case main body to cover the lamp and constitutes a frame-shaped frame portion that is flush with the case main body.

The lead wire may have a portion arranged along the outer side surface of the recess of the case body.

The display device according to claim 6 is the display device according to claim 1 or 3.
It comprises the described backlight and a display means arranged in front of the second diffusing means.

A liquid crystal display device according to a seventh aspect comprises the backlight according to the first or third aspect and a liquid crystal display means arranged in front of the second diffusing means.

[0029]

According to the first aspect of the invention, the light guide plate, the reflecting means or the first diffusing means, and the second diffusing means are arranged inside the recess of the case body. The lamp is disposed in the notch of the case body, and the light emitted from the lamp is introduced from the side surface of the light guide plate. The lead wire is arranged along the outer side surface of the recess of the case body, and is electrically connected to the lamp lighting means arranged on the side of the recess of the case body.

According to the second aspect of the invention, the light guide plate, the rectangular reflecting means or the first diffusing means, and the diffusing plate are arranged inside the rectangular concave portion of the case body. The lamp is disposed in the notch of the case body, and the light emitted from the lamp is introduced from the side surface of the light guide plate. The cutout portion of the case body is formed in two adjacent sides of the rectangular concave portion to form an L shape,
The letter-shaped lamp is arranged in this cutout. The lead wire is sandwiched between the outer side surface of the recess of the case body and the lead wire locking piece formed near the side surface. The lamp lighting means is arranged on the side of the concave portion where the cutout is not formed in the case body, and the lead wire is electrically connected.

The cover is formed in an L shape so as to correspond to the above two sides, and one end thereof is rotatably attached to the case body. By one continuous operation of rotating the cover, the cover is moved in the direction of the L-shaped notch to cover the lamp once, and the lamp is fitted into the notch.

According to the third aspect of the invention, the light guide plate, the reflecting means or the first diffusing means, and the second diffusing means are arranged inside the recess of the case body. The lamp is disposed in the notch of the case body, and the light emitted from the lamp is introduced from the side surface of the light guide plate. The lead wire is arranged along the outer side surface of the recess of the case body, and is electrically connected to the lamp lighting means arranged on the side of the recess of the case body. One side edge of a reflector that covers the lamp is fixed to the bottom of the recess of the case body, the middle surrounds the lamp, and the other edge is disposed on the light guide plate or the second diffusing means. One end of the cover is rotatably attached to the case main body, and by rotating the cover, the cover is moved in the direction of the cutout to cover the lamp and fitted into the cutout.

At this time, one side edge of the reflector is fixed to the case body near the lamp, and the other end is a free end. Then, when the cover moves in the direction of the cutout, the reflector is formed into a curved surface shape by being guided by the cover from the free end to the middle of the reflecting means to surround the lamp.

In the fourth aspect of the invention, the lighting means protection case fixes the lamp lighting means and protects it from external contact, impact and the like. The lighting means locking means is provided on the case body, and fixes the lighting means protection case.

According to the invention of claim 5, the light guide plate is arranged inside the recess of the case body. The lamp is disposed in the notch of the case body, and the light emitted from the lamp is introduced from the side surface of the light guide plate. The lead wire is arranged along the outer side surface of the recess of the case body, and is electrically connected to the lamp lighting means arranged on the side of the recess of the case body.
One end of the cover is rotatably attached to the case main body, and by rotating the cover, the cover is moved in the direction of the notch to cover the lamp, and a frame-like frame portion that is flush with the case main body is formed. To do.

In the invention of claim 6, the display means is illuminated by the backlight of claim 1 or 3.

According to the invention of claim 7, the backlight of claim 1 or 3 illuminates the liquid crystal display means.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A backlight according to a first embodiment of the present invention will be described below with reference to FIGS.

In the figure, the backlight is composed of a quadrangular light guide plate 1, a quadrangular reflector plate 2 as a reflection means provided on the back surface of the light guide plate 1, and a first light guide plate 1 provided on the front surface of the light guide plate 1. 2. A rectangular diffusion plate 3 as a diffusing means, a case body 4 having a recess and a cutout, an L-shaped lamp 5 arranged in the cutout, and a reflector 6 surrounding the lamp 5. The lead wire 7 led out from the lamp 5 arranged along the outer side surface of the recess of the case body 4 and the lead wire 7 arranged on the side of the recess of the case body 4 and electrically connected to each other. The lamp lighting means 8 and the L-shaped cover 9 that covers the reflector 6 are provided.

First, the light guide 1 introduces the light emitted from the lamp 5 from the side surface 1a and emits the light from the light emitting surface 1b side.

This light guide body 1 is made of an acrylic resin having an excellent visible light transmittance, and has outer dimensions of 150 mm wide, 100 mm long,
The lamp 5 is formed in a flat plate-like quadrangle having a thickness of 4 mm, which is larger than the outer diameter of the lamp 5. Further, although the light emitting surface 1b is processed to be flat, a conical small hole which is a first diffusing means is formed on the other surface 1c of the case body 4 facing the surface 1b so that the lamp 5 It is formed such that its size becomes larger as the distance of becomes larger.

The conical small hole is formed by pressing a heated conical mold against the acrylic resin surface, cutting it with a drilling machine, or by molding the light guide during molding. May be.

The reflector 2 is arranged on the side of the other surface 1c of the light guide 1 which faces the light exit surface 1b, and is attached to the bearing edge 4c formed around the window hole 4b of the recess 4a formed in the case body 4. It is arranged.

The external dimensions are the same as the dimensions of the light guide 1 except for the wall thickness. Further, a white sheet is used in order to reflect a large amount of light leaked from the light guide body 1 toward the light guide body 1, but a silver vapor deposition sheet may be used.

The diffusing plate 3 is arranged on the light emitting surface 1b side of the light guide 1 and has a different surface roughness on the front and back surfaces. In this case, a surface having a low surface roughness is located on the light emitting surface 1b side of the light guide body 1, and is arranged on the light guide body 1 with the rough surface facing upward.

Further, when a plurality of second diffusing means 3 are used, the light emitted from the light emitting surface 1b of the light guide 1 can be condensed uniformly in a plane.

The case body 4 is integrally molded of a synthetic resin such as a polycarbonate resin and has a substantially quadrangular outer shape (vertical, about 90 mm, horizontal, about 120 mm), and includes a light guide plate 1, a reflection plate 2 and a diffusion plate. An opening (a length, about 60 mm, a width, about 80 mm) of a recess 4a for housing 3 is formed, and this recess 4a
A window hole 4b is formed at the bottom of the.

Around the window hole 4b, a supporting edge 4c for supporting the reflector 2 is formed. Further, a cutout 4d is formed along two adjacent sides of the rectangular recess 4a.

A standing edge 4e is formed around the cutout portion 4d of the case body 4, and a bent portion 5a of the lamp 5 is provided between the raised edge 4e and a corner portion of the cutout portion 4d of the case body 4. The protrusion piece 4f is formed to support the. This protruding piece 4
The height of f is about 0.05 mm to 10 mm, and it is bent toward the lamp 5. By preventing the light from the lamp 5 to the light guide body 1, the protruding piece 4f can make the illuminance of the light emitted from the light emitting surface 1b of the light guide body 1 uniform.

The lamp 5 is made of soft glass and has an outer diameter of 3 mm.
A phosphor coating is formed on the inner surface of a cylindrical bulb having a total length of 160 mm, and electrodes are arranged at both ends of the bulb to seal a rare gas and mercury to hermetically seal them. After that, fix one end of the valve and free the other end to heat the part to be bent while rotating it at a low speed, and after heating for a predetermined time, stop the rotation and bend the other end to the right angle direction. As a result, an L-shaped lamp 5 having one side of 70 mm and the other side of 90 mm with a radius of curvature of about 6 mm is completed, and the L-shaped lamp 5 is completed.

The fluorescent lamp 5 may be either a hot cathode type or a cold cathode type, but as the lamp 5 used for the backlight, the rising characteristics are good and low power consumption is preferred, so that A cathode type fluorescent lamp is preferred.

In the reflector 6, one side edge 6a near the lamp 5 is fixed at the bottom of the recess 4a of the case body 4, the middle 6b surrounds the lamp 5, and the other end edge 6c is the light guide plate 1.
Alternatively, it is arranged on the diffusion plate 3.

The lead wires 7 and 7 are connected to both ends 5 of the lamp 5.
Two of them are led out from b and 5b and have a connector 7a. The lead wires 7 and 7 are arranged along the outer side surface 4g of the recess 4a of the case body 4 in which the cutout portion 4d is not formed, and the lead wire locking piece 4h formed in the vicinity thereof. It is pinched.

The lamp lighting means 8 is an inverter circuit, which is arranged on the side 4i of the recess 4a of the case body 4 and is electrically connected to the lead wires 7, 7. This lighting means 8
Is disposed inside the lighting means protection case 10, and the lighting means protection case 10 is fixed to the lighting means locking means provided in the case body 4. That is, the engaging holes 10a, 10a formed on the outside of the lighting means protection case 10 are detachably fixed by being inserted into the convex portions 4j, 4j which are the lighting means locking means.

The lamp lighting means 8 has an inverter circuit mounted on a circuit board 8a, and the circuit board 8a is slid between locking portions 10b, 10b formed inside the lighting means protection case 10. Have been inserted and fixed.

The cover 9 is integrally molded of the same synthetic resin as the case body 1, and has an L-shaped outer shape (vertical, approximately 90 mm,
The width is about 120 mm, the width is about 20 mm), and the lamp 5 is arranged above the notch 4d.

A cylindrical portion is formed at one end of the cover 9 so as to be rotatably fitted from the outside of the rotating shaft 4k. By fitting the cylindrical portion into the rotating shaft 4k, the cover 9 is rotatably pivoted.
The lamp 5 is covered by fitting into the notch 4d of the case body 4.

Next, the operation of this embodiment will be described.

In the backlight of this embodiment, the supporting edge 4c of the rectangular concave portion 4a of the case body 4 has a rectangular reflecting plate 2.
And the light guide plate 1 and the diffusion plate 3 are arranged in this order on top of each other. The L-shaped lamp 5 arranged in the cutout portion 4d is located on the side surface 1a of the light guide plate 1, and the emitted light is introduced from the side surface 1a of the light guide plate 1.

From both ends 5, 5 of this L-shaped lamp 5, 2
The lead wires 7 and 7 that have been finally led out have an outer side surface 4 of the concave portion 4a of the case body 4 in which neither of the cutout portions 4d is formed.
It is arranged along g and is sandwiched by a lead wire locking piece 4h formed in the vicinity thereof.

Further, the connector 7a of the lead wires 7, 7
Is connected to a lamp lighting means 8 arranged on the side 4i of the recess 4a of the case body 4.

One end of the L-shaped cover 9 is rotatably attached to the case body 4, and the cover 9 is rotated to perform one continuous operation.
The cover 9 and the case main body 4 form a frame-like frame portion which is flush with each other by being moved in the direction to cover the lamp 5 by one operation and fitted in the cutout portion 4d.

At this time, when the cover 9 moves in the direction of the notch 4d, the cover 9 guides the reflector 6 from the free end to the middle 6b to form the reflector 6 in a curved shape.
The structure surrounds the lamp 5.

Therefore, according to the backlight of this embodiment, first, the lamp lighting means 8 is disposed inside the lighting means protection case 10, and the lighting means protection case 10 is provided in the case body 4. Since it is fixed to the stopping means 4j, a casing or the like for fixing the lamp lighting means 8 and the case body 4 is not necessary, the number of parts can be reduced, and the cost can be reduced.

The lead wires 7, 7 electrically connected to the lamp lighting means 8 are arranged along the outer side surface 4g of the recess 4a of the case body 4, and the lead wire assembly formed in the vicinity thereof. Since it is sandwiched between the stopper 4h, the lead wire 7,
The length of 7 can be minimized, the arrangement structure can be simplified, and the assembly time to the case body 4 can be reduced.

Further, the lamp lighting means 8 is provided with the side 4 of the recess 4a in which the notch 4d in which the lamp 5 is arranged is not formed.
Since it is arranged at i, the direction of the portion supporting the end of the lamp 5 and the direction of the locking means 4i for fixing the lamp lighting means 8 are different, so that no dead space is formed and the case including the lamp lighting means 8 is formed. The body 4 can be formed compactly. The lead wires 7, 7 electrically connected to the lamp lighting means 8 are arranged on the outer side surface 4g of the recess 4a of the case body 4 and the lead wire locking piece 4h formed near the side surface 4g. Therefore, the lead wires 7, 7 can be reliably attached to the outer side surface 4g of the recess 4a.

Further, by one continuous operation of rotating the cover 9 rotatably attached to the case body 4,
The lamp 5 can be moved in the direction of the cutout portion 4d to cover the lamp 5 at a time and fitted into the cutout portion 4d, and the assembling work time can be shortened. At this time, when the cover 9 moves in the direction of the cutout 4d, the cover 6 guides the reflector 6 from the free end 6c to the middle 6b to form the curved surface of the reflector 6 and surrounds the lamp 5. As a result, it is possible to reduce the number of independent work steps for forming the reflector 6 into a curved surface, and shorten the assembly work time.

Next, a display device showing a second embodiment of the present invention will be described with reference to FIG. In this display device, the display means 8 is placed on the backlight of the first embodiment, and the display means 8 is illuminated from the back surface. In addition,
The same numbers are given to the same elements as those in the first embodiment.

According to this, the cover 9 and the case body 4 are securely fixed so that the surfaces thereof are flush with each other, so that the display means 8 can be fixed on the cover 9 and the case body 4.

Next, a liquid crystal display device showing a third embodiment of the present invention will be described with reference to FIG. This liquid crystal display device uses the display means 8 of the display device of the second embodiment as a liquid crystal display means. The same numbers are given to the same elements as those in the second embodiment.

According to this, since the surfaces of the cover 9 and the case body 4 constitute a frame-shaped frame portion which is flush with each other, the liquid crystal display means 8 is horizontally arranged on the cover 9 and the case body 4 with respect to the case body 4. Can be fixed.

[0072]

According to the first aspect of the present invention, since the lamp lighting means is disposed in the case body, a casing for fixing the lamp lighting means and the case body is unnecessary, and the number of parts can be reduced. Cost reduction can be achieved. Further, since the lead wire electrically connected to the lamp lighting means is arranged along the outer side surface of the recess of the case body, the length of the lead wire can be minimized, and the arrangement structure And the assembly time to the case body can be reduced.

In the invention of claim 2, the lamp lighting means is:
Since the lamp is arranged on the side of the recess where the notch is not formed, the direction of the support of the end of the lamp and the engaging part of the lamp lighting means is different, so no dead space is formed. The case body including the lamp lighting means can be formed compactly. Further, since the lead wire electrically connected to the lamp lighting means is arranged on the outer side surface of the recess of the case body and the lead wire locking piece formed in the vicinity of this side surface, the lead wire is securely connected to the recess. Can be attached to the outer side.

The invention of claim 3 has the same effect as that of the invention of claim 1, and further, by one continuous operation of rotating the cover rotatably attached to the case main body,
The lamp can be moved in the direction of the notch and covered with the lamp at one time so that the lamp can be fitted into the notch, and the assembly work time can be shortened.
Furthermore, at this time, when the cover moves in the direction of the cutout, the reflector is formed into a curved shape by being guided by the cover from the free end of the reflector to the middle, and the reflector is surrounded by the curved surface. It is possible to reduce the number of independent work steps that are formed into a shape, and shorten the assembly work time.

According to the invention of claim 4, the lighting means protection case can fix the lamp lighting means and protect it from external contact, impact, and the like. Further, the lighting means locking means is provided in the case body, and the lighting means protection case can be easily and detachably fixed.

The invention of claim 5 has the same effect as that of the invention of claim 1, and further, by a continuous operation of rotating the cover rotatably attached to the case main body,
By moving the lamp in the direction of the notch to cover the lamp at one time and fitting it into the notch, a frame-shaped frame part can be formed such that the case body and the cover are flush with each other, and the liquid crystal display means, etc. are arranged horizontally on the upper surface. Can be placed.

According to the invention of claim 6, the display means can be illuminated by the backlight of claim 1 or 3.

In the invention of claim 7, the liquid crystal display means can be horizontally fixed by the backlight of claim 1 or 3.

[Brief description of drawings]

FIG. 1 is a front view of a backlight showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of an AA cross section of the backlight shown in FIG.

FIG. 3 is a rear view of the backlight shown in FIG.

FIG. 4 is a left side view of the backlight shown in FIG.

5 is a view of the backlight of FIG. 1 when the cover is rotated.

FIG. 6 is a sectional view of a display device showing a second embodiment or a liquid crystal display device showing a third embodiment of the present invention.

FIG. 7 is an exploded perspective view of a backlight device showing a first conventional example.

FIG. 8 is a perspective view of a backlight device showing a second conventional example.

FIG. 9 is a plan view of a backlight device showing a third conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light guide plate 2 ... Reflecting means 3 ... Diffusing plate 4 ... Case body 5 ... Lamp 6 ... Reflector 7 ... Lead wire 8 ... Lamp lighting means 9 ... Cover

Claims (7)

[Claims] 1. A light guide plate; a reflection means or a first diffusing means arranged on the back surface of the light guide plate; a second diffusing means arranged on the front surface of the light guide plate; a light guiding plate, a reflecting means or A recess for accommodating the first diffusing means and the second diffusing means therein;
A case body including a notch formed in a part of the recess; and a case body provided in the notch so as to introduce light into the light guide plate from a side surface of the light guide plate housed in the recess of the case body. A lead wire led from the lamp arranged along the outer side surface of the recess of the case main body; disposed on the side of the recess of the case main body and electrically connected to the lead wire. A backlight comprising: a lamp lighting means; 2. A rectangular light guide plate; a rectangular reflector or first diffusing means provided on the back surface of the light guide plate; a rectangular diffuser plate provided on the front surface of the light guide plate; a light guide plate, A case main body including a reflection unit or a first diffusion unit, and a rectangular recess for accommodating the diffusion plate therein, and a notch formed on two adjacent sides of the rectangular recess; L-shaped lamp disposed in the notch of the case body so as to introduce light into the light guide plate from the side surface of the light guide plate; an outer side surface of the recess of the case body and the case body near the outer side surface A lead wire led out from the lamp, which is arranged between the lead wire locking piece formed on the side of the case; Lamp lighting means electrically connected; Backlight, characterized in that is. 3. A light guide plate; a reflection means or a first diffusion means arranged on the back surface of the light guide plate; a second diffusion means arranged on the front surface of the light guide plate; a light guide plate, a reflection means or A recess for accommodating the first diffusing means and the second diffusing means therein;
A case body including a notch formed in a part of the recess; and a case body provided in the notch so as to introduce light into the light guide plate from a side surface of the light guide plate housed in the recess of the case body. A lead wire led from the lamp arranged along the outer side surface of the recess of the case main body; disposed on the side of the recess of the case main body and electrically connected to the lead wire. A lamp lighting means, which has one side edge near the lamp fixed at the bottom of the recess of the case body, the middle portion surrounding the lamp, and the other end edge of the light guide plate or the second
A reflector disposed on the diffusing means; a cover rotatably attached at one end to the case body so as to fit the notch in the case body to cover the lamp. Backlight. 4. A lighting means protection case for fixing the lamp lighting means; and a lighting means locking means provided on a case body for fixing the lighting means protection case. The backlight according to any one of 1 to 3. 5. A light guide plate; a recess for accommodating the light guide plate therein,
A case body including a notch formed in a part of the recess; and a case body provided in the notch so as to introduce light into the light guide plate from a side surface of the light guide plate housed in the recess of the case body. A lead wire led from the lamp arranged along the outer side surface of the recess of the case main body; disposed on the side of the recess of the case main body and electrically connected to the lead wire. A lamp lighting means for rotating the lamp, one end of which is rotatably pivotally attached to the case main body, and a cover which fits into a notch of the case main body to cover the lamp and constitutes a frame-like frame portion flush with the case main body; A backlight that is characterized by 6. A display device, comprising: the backlight according to claim 1 or 3; and a display means arranged in front of the second diffusing means. 7. A liquid crystal display device comprising: the backlight according to claim 1 or 3; and liquid crystal display means arranged in front of the second diffusing means.