JP3332830B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device suitable for large-screen display.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal display device, driving elements are arranged around and behind a liquid crystal panel and housed in a frame together with illumination means. At this time, the fixing of the frame is performed by the method disclosed in Japanese Patent Application Laid-Open No.
As shown in Japanese Patent No. 983 or the like, a separate frame is used to fit or engage with claws or holes and fixed.

[0003]

However, such a liquid crystal display device is required to be mounted on a personal computer or the like so that the entire device is thin and the effective display surface is large with respect to the surface area. Therefore, when the screen is enlarged and the outer frame of the effective display surface is narrowed, the crosspiece of the frame becomes thin, the strength of the frame itself is reduced, and the fitting and the engagement are easily released. If the device is designed so as not to come off easily, the assembling work becomes difficult in general, and it is difficult to disassemble in so-called maintenance such as replacement of a light source having a relatively short life such as a light source of the illuminating means.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a liquid crystal panel, a lighting means for a liquid crystal panel disposed on the back of the liquid crystal panel, and a support for the liquid crystal panel. In a liquid crystal display device having a frame housing the lighting means, a back plate covering at least a part of the lighting means, and a substantially rectangular metal frame covering the periphery of the liquid crystal panel,
The back plate protrudes from the back plate and has a claw having a key portion that engages with a side surface of the frame body. The metal frame engages with the claw frame body of the back plate. And a plurality of engaging means for engaging a key provided on the opposite side of the part.

[0005]

[0006]

FIG. 1 is a plan view of a liquid crystal display device of the present invention with a metal frame removed, and FIG. 2 is a cross-sectional view corresponding to AA of FIG. 1 with the metal frame assembled. FIG. In these figures, reference numeral 1 denotes a liquid crystal panel, for example, an STN liquid crystal panel or a TFT liquid crystal panel suitable for a large screen, which is a twisted nematic liquid crystal display. Such a liquid crystal panel has an outer frame portion on the effective display surface by disposing the driving elements in the glass substrate or on the back surface of the glass substrate, rather than an STN liquid crystal panel in which a large number of driving elements are disposed directly around the glass substrate. In particular, a liquid crystal panel having an active element for each pixel which reduces the width is particularly preferable. Such a liquid crystal panel 1 has a large display surface, for example,
The effect is particularly great for those of up to 20 inches.

Reference numeral 2 denotes a liquid crystal panel illuminating means disposed on the back surface of the liquid crystal panel 1, and a light guide plate 21 made of a substantially flat transparent acrylic resin plate or the like and a linear light guide plate arranged on the side surface of the light guide plate 21. It comprises a light source 22. A reflection sheet, a light diffusion sheet, a lens plate, and the like are laminated on the light guide plate 21 as needed, and light is efficiently and uniformly spread in the plane to illuminate at least the effective display surface of the liquid crystal panel 1. The linear light source 22 is formed of a cold cathode tube or a fluorescent tube.

Reference numeral 3 denotes a resin frame which supports the liquid crystal panel 1 and accommodates the illuminating means 2. The liquid crystal panel 3 supports the liquid crystal panel 1 on the front side and accommodates the illuminating means 2 on the back side. It has a large through hole in the center so as to be led to 1, and therefore has a substantially rectangular shape in plan view as a whole. The frame 2 is provided with four mounting portions 31 called ears on both sides for mounting and fixing the liquid crystal display device itself to a personal computer or the like. At least in the vicinity of two opposing side surfaces, more preferably in the vicinity of four side surfaces, engaging means are provided. In the case of FIG. 1, a plurality of protrusions 33 are provided near three side surfaces, and a step portion 34 is provided near the remaining one side surface.

Reference numeral 4 denotes a back plate having a claw 5 engaging with the side surface of the frame 3 and covering at least a part of the illumination means 2.
It is composed of a resin molded product having a letter shape. Claw 5 is back plate 4
Four key portions 5 are provided along one side surface of the frame 3 so as to protrude from the main surface.
1 and a key portion 52 directed outward in a substantially central portion. The directions of the two key portions 51 and 52 are configured to be substantially opposite to the respective engagement directions. The key 51 toward the frame 3 is engaged with the step 34 of the frame 3.

Reference numeral 6 denotes a metal frame formed of a thin metal plate covering the periphery of the liquid crystal panel 1 and has a large through hole at the center for exposing at least the effective display surface of the liquid crystal panel 1 so that it is planar in plan view. It has a substantially rectangular shape. For this reason, the metal frame 6 itself has low strength and is likely to bend or bend at corners, but it is sufficient if it is robust after assembly. The metal frame 6 is provided with vertical portions 61 around all four sides, so that the liquid crystal panel 1, the frame 3 and the like can be stored. The hanging portion 61 is provided with a plurality of engaging means 7 including a through hole 71 and a tongue piece 72 directed toward the inside of the through hole, and three adjacent hanging portions 61 are provided near three side surfaces of the frame. The projection 33 enters the through hole 71 and the lower part thereof is engaged with the tongue piece 72 by being locked. In the remaining vertical portion 61, the projection of the key portion 52 directed to the outside of the claw 5 enters the through hole 71, and the lower portion thereof is engaged by the tongue piece 72.

Such a liquid crystal display device has, for example, a diagonal of 1.
In the case of a 3.3 inch liquid crystal display device, the outer shape is 211
mm × 290 mm × thickness 6.4 mm. In this case, the metal frame 6 has a thickness of 0.3 mm and a width of the crosspiece on the display surface side of 3 to 6 mm.

In the above description, the claw 5 is a cantilever projecting from the back plate 4 and therefore has a cushioning property to the metal frame 6, and the metal frame 6 is directly engaged with and fixed to the frame 3 on one side. On the side surface opposite to the side surface, engagement and fixation are performed via the claw 5 having a cushioning property. In addition,
The terms “engage”, “lock”, and “engage fixed” do not indicate different states, and may be in a state where they cannot be easily separated and separated due to close contact, engagement, and the like. Since the claw 5 has a cushioning property, it is easy to engage when assembling the metal frame 6, and it is difficult to be disengaged by bending or vibration after the engagement, and it is easy to disassemble by pressing the protrusion from outside with a sharp shaft or the like. Particularly, in order to prevent the claws 5 from separating due to vibration or bending after the engagement, it is preferable that the claw 5 is configured to engage with the frame 2 in the opposite direction to the metal frame 6 as in the above-described example. If the back plate 4 serves as a lid for the linear light source 22 of the lighting means 2, the workability of replacing the linear light source is improved, and a plurality of claws 5 are arranged at positions corresponding to the side surfaces of the liquid crystal display device. Thus, the entire apparatus is uniformly hardened.

[0013]

As described above, according to the present invention, a frame for supporting a liquid crystal panel and accommodating an illuminating means, a back plate provided with a claw having a key portion engaged with a side surface of the frame, and Since it has a metal frame having a plurality of engaging means for engaging the key portion of the claw of the back plate provided on the opposite side of the engaging portion with the frame,
A liquid crystal display device that is easy to assemble, robust, thin, and has a large effective display surface with respect to the surface area can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal display device of the present invention with a metal frame removed.

FIG. 2 is a cross-sectional view of FIG.
It is sectional drawing corresponding to A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Lighting means 3 Frame 4 Back plate 5 Claw 6 Metal frame 7 Engagement means

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-5744 (JP, A) JP-A-8-190085 (JP, A) JP-A-9-44096 (JP, A) JP-A-6-1994 66971 (JP, A) Japanese Utility Model Application Hei 5-71823 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1333 G09F 9/00-9/46

Claims (1)

(57) [Claims] 1. A liquid crystal panel and a liquid crystal panel disposed on a back surface of the liquid crystal panel.
Illuminating means for the liquid crystal panel placed, and supporting the liquid crystal panel.
A frame body for holding the lighting means, and at least
A back plate that covers a part and a roughly square-shaped
In a liquid crystal display device having a metal frame, the back plate protrudes from the back plate, and a side of the frame body.
The metal frame has a claw having a key portion that engages with a surface, and the metal frame is engaged with the claw frame of the back plate.
A plurality of engagement means for engaging a key portion provided on the opposite side of the portion
A liquid crystal display device comprising: