JP2003050395A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize cost reduction by simplifying assembly work without variation of product quality. SOLUTION: A first housing 1 containing a light guide body 4 and a linear light source 6, constructing a backlight, and a liquid crystal display panel 3 is inserted into a second housing 2 with a sliding system. Projecting parts 13a, 13b are respectively formed on side walls 11a, 11b of the first housing 1. Recessing grooves 26a, 26b are respectively formed on skirt parts 21a, 21b of the second housing 2. Mutual sliding of the two housings are carried out by joining the projecting parts 13a, 13b to the recessing grooves 26a, 26b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display panel and a light guide on the back surface of the liquid crystal display panel and a linear light source installed along side edges of the light guide. The present invention relates to a liquid crystal display device that integrally holds a backlight and a housing.

[0002]

2. Description of the Related Art In a liquid crystal display device capable of high-definition and color display for a notebook computer or a computer monitor, a light source for illuminating a liquid crystal display panel from the back (so-called
Back light). As the illumination light source of the liquid crystal display panel, a side edge type backlight in which a linear light source is installed on the side (edge) of a generally flat light guide plate, or a plurality of linear light sources are installed directly on the back surface of the liquid crystal display panel A direct type backlight is known.

Particularly, the side edge type backlight is
At least one linear light source arranged along at least one side edge of a light guide plate made of a transparent plate such as an acrylic plate;
It is generally composed of a diffusion plate laminated on the liquid crystal panel side of the light guide plate and an optical sheet composed of a prism sheet. Then, the backlight is housed in a first housing (so-called lower case), a liquid crystal display panel is loaded thereon, and then a second housing made of metal or alloy having a display window (so-called upper case). And is combined with the first housing so as to be integrated as a liquid crystal display device (so-called liquid crystal display module).

FIG. 7 is a developed perspective view for explaining the schematic structure of a conventional liquid crystal display device having a side edge type backlight. This liquid crystal display device is a liquid crystal display panel (PN
L) 3, a light guide plate 4, a linear light source 6, and a first housing (lower case) 1 that houses an optical sheet 5 made of a diffusion sheet or a prism sheet, and a second frame member that is also a frame member.
The housing (upper case) 2 is covered with the first housing 1, and the claw 25 formed in the bent portion (skirt portion) around the second housing 1 is engaged with the engaging portion 14 of the first housing. Are integrated. This engagement is performed by bending the claw 25 to the engagement portion 14 (the back surface of the first housing 1).

A sheet or the like is interposed between the light guide 4 and the optical sheet 5 housed in the first housing 1 and the second housing to cover the second housing, and the first housing 1 and the second housing Apply a certain amount of pressure to the housing and press the claw 2
The light guide 4 stored by bending 5
The liquid crystal display panel is held at a predetermined position.

[0006]

In such an integrated structure, the claws of the second housing 2 are projected to the rear surface of the first housing, which is one of the obstacles to the reduction of the total mounting thickness of the liquid crystal display device. It is a factor. In addition, as described above, the pressing force when the claw 25 of the second housing 2 is bent to the back surface of the first housing 1 is applied to the liquid crystal display panel, the light guide plate, the linear light source, or the liquid crystal display panel (not shown). It is not without exception that it damages the drive circuits and the like arranged on the periphery.

Furthermore, in the work of integrating the first housing and the second housing in the manufacture of the above-mentioned conventional liquid crystal display device, it is difficult to evenly crimp a plurality of claws, it takes a lot of time for the work, and the cost is reduced. It was one of the factors that hinder the. This is the same whether the first housing is made of resin or metal.

As an example of the integrated structure of the liquid crystal display panel and the backlight structure, the liquid crystal display panel and the surroundings of the backlight are separate structures, and the backlight structure is inserted into the housing in which the liquid crystal display panel is mounted. A configuration having such a configuration is proposed in Japanese Patent Laid-Open No. 9-65258. However, this example relates to a monitor device that does not particularly need to reduce the thickness of the liquid crystal display device, has a problem different from the present invention, and cannot be the prior art of the present invention.

An object of the present invention is to reduce the thickness of a liquid crystal display device required for portable electronic equipment such as a notebook computer,
Provided is a liquid crystal display device which has an integrated structure different from the conventional one, avoids damage to a liquid crystal display panel and a backlight in an assembly process, simplifies the assembly work, has no product variation, and realizes cost reduction. To do.

[0010]

In order to achieve the above object, the present invention has a construction in which a first housing accommodating a backlight and a liquid crystal display panel is slidably inserted into a second housing. . That is, the side wall of the first housing and the skirt portion of the second housing are formed with a protrusion and a groove for engaging and sliding with each other, and the first housing is slid inward from one side of the second housing. It is characterized in that it can be integrated by storing it. The typical constitution of the present invention is as follows.

(1) A liquid crystal display panel, a first housing accommodating an illuminating device which is arranged so as to face one main surface of the liquid crystal display panel, and the other main surface of the liquid crystal display panel. A first skirt portion and a second skirt portion formed so as to hold the first housing from the outside of the exposed window while holding the first side wall and the second side wall provided on the pair of parallel sides thereof. And a second housing having a skirt portion, and the lighting device includes a light guide body having a light emitting surface facing the one main surface of the liquid crystal display panel, and at least one of the light guide bodies. An illumination light source arranged along the edge, and a protrusion formed along the arrangement direction of the illumination light source on each of the first side wall and the second side wall of the first housing. And having the protrusion of the second housing It said first skirt portion has a second
Each of the skirts has a groove for receiving the protrusion of the second housing.

In (2) and (1), the illumination light source is a linear light source having a longitudinal direction along the edge of the light guide.

In (3), (1) or (2), one of the other pair of sides intersecting the pair of sides having the first side wall and the second side wall of the first housing, The third skirt portion of the second housing has a third side wall with which a third skirt portion intersecting the first skirt portion and the second skirt portion of the second housing abuts. Has an opening for inserting the first housing on a side that is paired with the first housing, and a recessed line provided in the second housing is inserted from the opening of the second housing. It was used as a guide member for the protruding portion.

The first housing is inserted through an opening provided on one side of the second housing, and the above-mentioned protruding portion is engaged with the concave groove so as to abut against the third skirt portion at the end of the second housing. By doing so, predetermined alignment is performed and both are integrated. By tightly engaging the protrusion and the recess, the rattling between the two is suppressed.

In (4) and (3), the side of the second housing having the opening is provided with a claw that bends toward the first housing and engages with the first housing.

Sufficient integration is achieved only by the engagement of the protrusion provided on the first housing and the recess provided on the second housing.
A claw is provided on the side of the housing having the opening, and the claw is caulked to the first housing. If the first housing is formed with the concave portion for receiving the claw, the thickness of the entire liquid crystal display device is not increased.

In any one of (5) and (1) to (4), the first housing is a resin molded product.

In any one of (6) and (1) to (4), the first housing is a molded product of a metal plate or an alloy plate.

In (7) and (6), on the side of the first housing located at the opening of the second housing,
It has a claw that bends toward the second housing and engages with the second housing. At this time, by forming a concave portion for receiving the claw in the first housing, the thickness of the entire liquid crystal display device is not increased in the same manner as above.

In any one of (8) and (1) to (6), the linear light source is a cold cathode fluorescent lamp.

In (9) and (6), the linear light source is a cold-cathode fluorescent lamp, and the cold-cathode fluorescent lamp is covered with the cold-cathode fluorescent lamp except a portion facing the light guide body and is in close contact with the first housing. A lamp reflector made of a metal plate was installed.

In any one of (10) and (1) to (9), the linear light sources are arranged along two parallel edges of the light guide.

In the above description, the convex portion is provided on the first housing side and the concave line is provided on the second housing. However, this is the reverse engagement (the concave line on the first housing side and the second line). The same effect can be obtained by providing a convex portion on the housing.The convex portion and the concave line here are expressed by the concave and convex shape when viewed from the first housing side.

The groove provided on one of the first housing and the second housing is continuous along the side of the housing, but the projection provided on the other is a continuous projection similar to the groove. Alternatively, one may be provided in the vicinity of at least both ends of the side, or a plurality may be provided discontinuously along the side. Further, it is not necessary to form the recessed line up to the end portion of the side, and it is also possible to form at least in the range where the first housing can be inserted and integrated into a predetermined position inside the second housing.

Furthermore, the cross-sectional shape of the convex portion and the cross-sectional shape of the concave line may be any as long as they can engage and slide. It is needless to say that the present invention is not limited to the above-described configuration and the configurations of the examples described below, and various modifications can be made without departing from the technical idea of the present invention.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings of the embodiments. FIG. 1 is a development view schematically explaining a first embodiment of a liquid crystal display device according to the present invention. In the drawings, reference numeral 1 is a first housing, which is made of resin in this embodiment. This first
The housing 1 has a frame shape as a whole, and has an opening at a part of its bottom portion or has an integral bottom plate. Protrusions 13a and 13b are formed on the pair of side walls 11a and 11b on the long side of the first housing 1, respectively.

Of the short side walls 12a and 12b, the side wall 12a opposite to the side wall 12b inserted into the second housing 2 is provided on the bottom side of the second housing 2 if necessary. Locking portions 14a, 14b for engaging the claws
Are formed. In the first housing 1, a light guide, a linear light source (here, a cold cathode fluorescent lamp), a backlight including an optical sheet, and a liquid crystal display panel 3 are housed. In the figure, a state in which a liquid crystal display panel is laminated on a back light is shown by PNL / BL.

Reference numeral 2 is a second housing, which has an opening serving as a display window of the liquid crystal display device in most of the central region, and has a first skirt portion 21a on each long side,
It has a second skirt portion 21b. First skirt part 2
Recesses 26a and 26b are formed in the longitudinal direction of the 1a and second skirt portions 21b, respectively. Further, the other of the short sides has a third skirt portion 22 with which the first housing 1 abuts. Each skirt 21a, 21b,
The lower end of 22 is bent inward so that the flanges 23a, 2
3b and 23c are formed so as to hold the lower end peripheral edge of the inserted first housing 1. In addition, instead of the above flanges, the skirt portions 21a, 21b,
The bottom end of 22 may be continuous to form a bottom plate.

An opening 24 for inserting the first housing 1 is provided on one of the short sides of the second housing 2. Further, in the opening 24, claws 25a and 25b that are engaged with the engaging portions 14a and 14b formed in the first housing 1 after the first housing 1 is inserted are formed. However, the convex portions 13a, 13b and the concave stripes 26a, 2
If the first housing 1 and the second housing 2 can be sufficiently integrated with each other only by the engagement of 6b, the claws 25a,
25b and locking parts 14a and 14b are not essential.

The first housing 1 is inserted into the second housing 2 through the opening 24 as shown by the arrow in FIG. At this time, the convex portions 13a and 13b of the first housing 1 and the concave stripes 26a and 26b formed in the second housing engage and slide, so that one short side 12b of the first housing 1 is moved. Third of second housing 2
It is pushed until it hits the skirt portion 22 of. In this state, the first housing 1 and the second housing 2 integrally fix the liquid crystal display panel and the backlight and are fixed in a predetermined positional relationship. Then, the claws 25a provided as necessary,
25b is bent and locked to the locking portions 14a and 14b.

FIG. 2 is a schematic cross-sectional view in the short side direction of FIG. 1 for explaining a state in which the first housing is inserted into and integrated with the second housing in the first embodiment of the present invention. In the figure,
The same reference numerals as those in FIG. 1 correspond to the same portions, reference numeral 4 is a light guide, reference numeral 5 is an optical sheet, reference numeral 6 is a cold cathode fluorescent lamp as a linear light source, reference numeral 7 is a lamp reflection sheet, and reference numeral 8 is a drive circuit board. Is.

When the first housing 1 is inserted into the second housing 2 as shown by the arrow in FIG. 1, the protrusions 13a and 13b provided on the side wall of the first housing 1 are formed in the second housing 2. Recess 2 provided on the skirts 21a and 21b
6a and 26b are engaged and slide. The protrusions 13a and 13b provided on the side wall of the first housing 1 are not limited to the continuous shape as shown in the figure, and may be discontinuous. The extension length of the recessed strips 26a and 26b is such that
The side wall 12b of the first housing 1 is the second housing 2
When it is inserted up to the position where it abuts against the third skirt portion 22), the convex portions 13a, 13b form the concave stripes 26a,
Anything can be used as long as it engages with 26b.

In the state shown in FIG. 2, the first housing 1 and the second housing 2 are integrated. The two housings can be commercialized as a liquid crystal display device as they are, but if it is desired to further integrate the two housings, the claws 25a and 25b shown in FIG. 1 are provided on the opening 24 side of the second housing 2. This may be bent to the first housing 1 side and caulked to the engaging portions 14a and 14b. According to the present embodiment, it is possible to provide a liquid crystal display device that avoids damage to the liquid crystal display panel and the backlight in the assembly process, simplifies the assembly work, has no product variations, and realizes cost reduction.

FIG. 3 is a sectional view schematically explaining a second embodiment of the liquid crystal display device according to the present invention. Further, FIG. 4 is a perspective view illustrating a schematic structure of the first housing. The same reference numerals as those in the drawings of the above-described embodiments in FIGS. 3 and 4 correspond to the same functional portions. This embodiment is substantially the same as the first embodiment except that the first housing 10 is made of metal.

In this embodiment, the light guide plate 4 constituting the backlight, the cold cathode fluorescent lamp 6 as the linear light source, the optical sheet 5, the liquid crystal display panel 5, and the like are housed in the first member.
The housing 10 is formed by pressing a metal plate into a substantially dish shape. It has an opening at a part of its bottom or has a bottom plate integral with the whole. Protrusions 130a and 130b are formed on a pair of long side walls 110a and 110b of the first housing 10, respectively.

Of the short side walls 120a and 120b, the side wall 120b on the side to be inserted into the second housing 2 is also used.
An engaging portion 140 for engaging a claw of the second housing 2 on the bottom side of the side wall 120a opposite to the side as necessary.
a and 140b are formed. An opening (not shown) serving as a display window of the liquid crystal display device is provided in most of the central area of the second housing 2, and the first skirt portion 21a and the second skirt are provided on the respective long sides. It has a portion 21b. In the first skirt portion 21a and the second skirt portion 21b,
Recesses 26a and 26b are formed in the longitudinal direction, respectively.

The first housing 1 is provided on the other of the short sides.
It has a third skirt 22 against which 0 abuts. The lower ends of the skirts 22a, 22b, 22 are bent inward to form flanges 23a, 23b, 23c so as to hold the lower end peripheral edge of the inserted first housing 1. Each skirt portion 22a, 22b, 22
The lower end of the first housing 10 is bent inward and holds the lower end peripheral edge of the first housing 10. In addition,
Each skirt portion 22a, 22 in place of each of the above flanges
The bottom ends of b and 22 may be continuous to form a bottom plate.

An opening 24 for inserting the first housing 10 is provided on one of the short sides of the second housing 2. Further, in the opening 24, the claws (25 in FIG. 1) that are locked to the locking portions 140a and 140b formed in the first housing 10 after the first housing 10 is inserted.
a and 25b) are formed. But,
If the first housing 10 and the second housing 2 can be sufficiently integrated by only engaging the protrusions 130a and 130b with the recesses 26a and 26b, such claws and locking portions 14a and 14b are Not required.

The first housing 10 is a second housing as in FIG.
It is inserted into the housing 2 through the opening 24. At this time, the convex portion 13 included in the first housing 10
0a, 130b and the recesses 26a, 26b formed in the second housing 2 engage with each other and slide, and one short side 12b of the first housing 1 is the third side of the second housing 2.
It is pushed until it hits the skirt portion 22 of. In this state, the first housing 10 and the second housing 2 integrally fix the liquid crystal display panel and the backlight and are fixed in a predetermined positional relationship. Then, the nails (25
a, 25b) are bent and locked to the locking portions 14a, 14b.

In the present embodiment, the lamp reflection plate 70 for reflecting the light of the cold cathode fluorescent lamp 6 which constitutes the backlight in the direction of the light guide plate 4 is formed of a thin metal plate, and this is closely attached to the first housing 10. ing. With this structure, the heat generated by the cold cathode fluorescent lamp 6 is generated by the first housing 10.
It can radiate heat itself through a heat sink. Also according to this embodiment, it is possible to provide a liquid crystal display device that avoids damage to the liquid crystal display panel and the backlight in the assembly process, simplifies the assembly work, has no product variations, and realizes cost reduction.

FIG. 5 is a pentagonal view for schematically explaining a third embodiment of the liquid crystal display device according to the present invention. FIG. 5 (a) is a plan view and FIG. 5 (b) is for inserting a first housing. A side view of the long side having an opening, (c) is a side surface opposite to the opening,
The same (d) and (e) are side views of the short side. In this embodiment, the second housing 2 is provided with an opening for slidingly inserting the first housing 1 for accommodating the components including the liquid crystal display panel and the backlight in the second housing 2.
It is provided on the long side of the.

This embodiment is particularly suitable for a structure in which the cold cathode fluorescent lamp is installed on the short side of the light guide. In the present embodiment, the case where the cold cathode fluorescent lamp 6 is installed on both short sides of the light guide is shown. The other configuration is similar to that of FIG. Further, the first housing 1 may be made of the metal described in the second embodiment.
Also according to this embodiment, it is possible to provide a liquid crystal display device that avoids damage to the liquid crystal display panel and the backlight in the assembly process, simplifies the assembly work, has no product variations, and realizes cost reduction.

In each of the above embodiments of the present invention, the insertion direction of the first housing into the second housing is parallel to the longitudinal direction of the linear light source (cold cathode fluorescent lamp). However, the direction is not limited to the above and may be a direction perpendicular to the longitudinal direction of the linear light source.

FIG. 6 is an explanatory diagram of a notebook type personal computer as one cold cathode fluorescent lamp of an electronic device in which the liquid crystal display device of the present invention is mounted. The liquid crystal display device mounted on the display unit of this notebook computer is one of the embodiments described above. In FIG. 6, the cold cathode fluorescent lamp CFL is shown by a virtual line on the lower side. The liquid crystal display device using the liquid crystal display panel PNL as a screen is obtained by inserting the first housing from the short side of the second housing as described in the first and second embodiments of the present invention. The assembled one is used. It is needless to say that the liquid crystal display device according to the present invention is not limited to the notebook computer as shown in FIG. 6 and can be similarly applied to the display device of a display monitor, a television receiver, and other devices.

[0045]

As described above, according to the present invention,
With the structure in which the lower frame is inserted from the side of the position of the upper frame to integrate it, damage to the liquid crystal display panel and the backlight in the assembly process is avoided, and the assembly work is simplified and there is no product variation, A liquid crystal display device that realizes cost reduction can be provided.

[0046]

[Brief description of drawings]

FIG. 1 is a development view schematically illustrating a first embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a schematic cross-sectional view in the short side direction of FIG. 1 for explaining a state in which the first housing is inserted into and integrated with the second housing in the first embodiment of the present invention.

FIG. 3 is a sectional view schematically illustrating a second embodiment of the liquid crystal display device according to the present invention.

FIG. 4 is a perspective view illustrating a schematic structure of a first housing in FIG.

FIG. 5 is a five-view diagram schematically illustrating a third embodiment of the liquid crystal display device according to the present invention.

FIG. 6 is an electronic device 1 in which the liquid crystal display device of the present invention is mounted.
It is explanatory drawing of the notebook computer as a cold cathode fluorescent lamp.

FIG. 7 is a developed perspective view illustrating a schematic configuration of a liquid crystal display device including a side edge type backlight.

[Explanation of symbols]

1 ... 1st housing, 11a, 11b ...
A pair of side walls on the long side, 13a, 13b ...
2a, 12b ... Side walls on the short side, 14a, 14b.
... Locking part, 2 ... Second housing, 21a
... First skirt portion, 21b ... Second skirt portion, 22 ... Third skirt portion, 26a, 26b
··· Recesses, 23a, 23b, 23c ··· Flange, 24 ··· Opening, 25a, 25b ··· Claw, 3
... Liquid crystal display panel, 4 ... Light guide plate, 5 ...
-Optical sheet, 6 ...- Linear light source (cold cathode fluorescent lamp), 7 ...- Lamp reflection sheet.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09F 9/00 G09F 9/00 336J 350 350Z 9/35 9/35 // F21Y 103: 00 F21Y 103: 00 F-term (reference) 2H089 HA40 JA10 QA12 TA17 TA18 TA20 2H091 FA14Z FA23Z FA41Z FA42Z FD12 FD13 LA12 5C094 AA41 AA42 AA43 AA44 BA43 5G435 AA17 BB12 BB15 EE23 EE27 GG43 KK02 KK05 KK10 KK10

Claims (10)

[Claims] 1. A liquid crystal display panel, a first housing that accommodates an illuminating device that is arranged so as to face one main surface of the liquid crystal display panel, and exposes the other main surface of the liquid crystal display panel. A first skirt portion and a second skirt formed so as to hold the first housing from the outside of the window by holding a first side wall and a second side wall provided on a pair of parallel sides of the first housing. A second housing having a light emitting surface, the lighting device having a light emitting surface facing the one main surface of the liquid crystal display panel, and at least one edge of the light guiding body. And an illumination light source disposed along the first side wall and a second side wall of the first housing, and a protrusion formed along the arrangement direction of the illumination light source. , Having the protrusion of the second housing A liquid crystal display device comprising in each of said first skirt portion and a second skirt portion, to have a concave for receiving the projecting portion of the second housing. 2. The liquid crystal display device according to claim 1, wherein the illumination light source is a linear light source having a longitudinal direction in a direction along an edge of the light guide. 3. The first skirt portion of the second housing is provided on one of a pair of other sides of the first housing which intersects a pair of sides having the first side wall and the second side wall. Has a third side wall with which a third skirt portion intersecting with the second skirt portion abuts, and the first side is formed on the side of the second housing that is paired with the third skirt portion. A recess having an opening through which the housing is inserted, and the recessed line provided in the second housing is a guide member for the projecting portion of the first housing inserted from the opening of the second housing. The liquid crystal display device according to claim 1 or 2. 4. A claw that bends toward the first housing side and engages with the first housing, at a side of the second housing having the opening, according to claim 3. Liquid crystal display device. 5. The liquid crystal display device according to claim 1, wherein the first housing is a resin molded product. 6. The liquid crystal display device according to claim 1, wherein the first housing is a molded product of a metal plate or an alloy plate. 7. A claw that bends toward the second housing and engages with the second housing is provided on a side of the first housing that is located in the opening of the second housing. The liquid crystal display device according to claim 6. 8. The liquid crystal display device according to claim 1, wherein the linear light source is a cold cathode fluorescent lamp. 9. The linear light source is a cold cathode fluorescent lamp,
7. The lamp reflector, which covers the cold cathode fluorescent lamp except for the portion facing the light guide body, and has a lamp reflector made of a metal plate that is installed in close contact with the first housing. Liquid crystal display device. 10. The liquid crystal display device according to claim 1, wherein the linear light sources are arranged along two parallel edges of the light guide.