JPH0728056A - Liquid crystal display device with back - Google Patents

Abstract

PURPOSE:To provide a liquid crystal display device with a back light constituted to facilitate an operation to exchange the back light and to enable the exchange of the back light even in a highly dusty environment. CONSTITUTION:The driving circuit of the liquid crystal display device with the back light constituted by housing a liquid crystal display section 30 and the back light 40 for illuminating the liquid crystal display section 30 in a housing consisting of a rear cap section 20 and a main unit section 10 is provided with auxiliary fittings 50-1, 50-2 for freely turnably mounting the rear cap section 20 on the main unit section 10. The liquid crystal display section 30 is provided with a light diffusion sheet 60 for protecting the liquid crystal display section 30 to be exposed at the time of exchanging the back light 40 by turning the rear cap section 20.

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 with a back light, and more particularly to a liquid crystal display device with a back light which facilitates replacement work of the back light.

[0002]

2. Description of the Related Art Conventionally, as a liquid crystal display device, there is known a liquid crystal display device with a backlight which uses a backlight to make the display clear.

This liquid crystal display device with a back light is composed of a liquid crystal display section and a back light for illuminating the liquid crystal display section from the back side.

In such a liquid crystal display device with a backlight, the life of the backlight is, for example, 1
0000 hours, the life of the liquid crystal display unit is, for example, 5000
The life of the backlight is considerably shorter than the life of the liquid crystal display unit, such as 0 hour.

Therefore, conventionally, in order to extend the life of the entire device, a liquid crystal display device with a backlight in which the backlight is replaceable has been proposed.

[0006]

However, the conventional liquid crystal display device with a back light is constructed by housing the back light and the liquid crystal display unit in a housing composed of a back cover part and a main body part. The back cover is attached to the main body by, for example, screws.

In this structure, in order to replace the backlight, first remove the screws from the back cover, and then
The back cover is removed from the body, and then the backlight connector is pulled out to replace the backlight.

By the way, in this type of liquid crystal display device with a back light, for example, in a display system of an FA (factory automation) system, the liquid crystal display device with a back light is attached to a wall at a predetermined position. In some cases, the back cover may drop if the screws on the back cover are removed. In this case, one worker presses the back cover and performs other work. There is a problem that a worker needs to remove the screws on the back cover and at least two workers are required to replace the backlight.

Further, when the backlight is replaced, the liquid crystal display unit itself, which is a precision electronic device, is exposed, and there is a problem that the backlight cannot be replaced especially in an environment with much dust. .

Therefore, an object of the present invention is to provide a liquid crystal display device with a backlight, which facilitates the replacement work of the backlight and allows the backlight to be replaced even in a dusty environment.

[0011]

In order to achieve the above object, the present invention comprises a liquid crystal display section and a backlight for illuminating the liquid crystal display section, which is housed in a housing composed of a back cover section and a main body section. In a liquid crystal display device with a backlight, an auxiliary metal fitting for rotatably attaching the back cover portion to the main body portion is provided, and when the backlight is replaced, the back cover portion is fixed by using the auxiliary metal fitting. It is characterized in that it is rotated with respect to the main body. Further, the present invention relates to a drive circuit of a liquid crystal display device with a backlight, which is configured by housing a liquid crystal display unit and a backlight for illuminating the liquid crystal display unit in a housing including a back cover and a main body. An auxiliary metal fitting for rotatably attaching the back cover part to the main body part is provided, and a light for protecting the liquid crystal display part exposed when the back cover part is rotated to replace the backlight. A diffusion sheet is provided in the liquid crystal display section.

[0012]

In the present invention, the back cover is rotatably attached to the main body by using the auxiliary metal fitting. This eliminates the inconvenience that the back cover part falls when the backlight is replaced, and enables one worker to replace the backlight. Here, the auxiliary metal fitting has, at one end, a plurality of hook portions that respectively engage with the plurality of slit portions of the side wall portion of the main body portion, and at the other end, fits into the plurality of slit portions of the side wall portion of the back cover portion. It can be composed of a plurality of substantially L-shaped metal fittings having a protrusion.

When replacing the backlight,
A light diffusing sheet for protecting the exposed liquid crystal display unit is provided in the liquid crystal display unit. As a result, when the backlight is replaced, the liquid crystal display unit is not directly exposed to the environment, and the backlight can be replaced even in an environment with much dust.

[0014]

Embodiments of the liquid crystal display device with a backlight according to the present invention will be described in detail below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a liquid crystal display device with a backlight according to the present invention. FIG. 1 shows a state in which a backlight 40 of the liquid crystal display device with a backlight is replaced. FIG. 2 shows a state when the liquid crystal display device with a backlight is used.

This liquid crystal display device with a backlight is shown in FIG.
As shown in FIG. 2, the liquid crystal display unit 30 and the backlight 40 are housed in a housing composed of the main body unit 10 and the back cover unit 20, and between the main body unit 10 and the back cover unit 20,
Auxiliary metal fittings 50-1 and 50-2 for rotatably attaching the back cover 20 to the main body 10 are provided.

FIG. 1 shows the auxiliary metal fittings 50-1 and 50.
2 is used to rotate the back cover 20 with respect to the main body 10 and take out the backlight 40 from the main body 10.

A light diffusion sheet 60 is attached to the liquid crystal display section 30 so as to cover the liquid crystal display section 30. The light diffusing sheet 60 prevents the liquid crystal display unit 30 exposed when the backlight 40 is taken out from the main body unit 10 from being directly exposed to the external environment, and the light from the backlight 40 is highly efficiently produced by the liquid crystal display unit. It has a function of irradiating 30.

FIG. 3 shows a detailed structure of the auxiliary metal fitting 50-1 shown in FIGS.

In FIG. 3, the auxiliary metal fitting 50-1 has a substantially L-shape, and one end of the auxiliary metal fitting 50-1 has a side wall 1 of the main body 10.
Hook portions 51a to 51f that engage with the slits 12a to 12f formed in the first cover 1 are formed, and slits 22a and 2 formed in the side wall 21 of the back cover portion 20 are formed at the other end.
2b is formed with protrusions 52a and 52b. Further, the auxiliary metal fitting 50-1 has a fixing screw 53a that fits into a small hole (not shown) formed in the side wall 21 of the back cover 20. 53b and 53c can be attached.

Using this auxiliary metal fitting 50-1, the main body 10
When attaching the back cover portion 20 to the back cover portion 20, first, the hook portions 51a to 51f of the auxiliary metal fitting 50-1 are respectively inserted into the slits 12a to 12f of the side wall 11 of the main body portion 10, and the protrusions 52a and 52b are attached to the back lid portion 20. Side wall 21
The slits 22a and 22b, and the back cover 20 is slid in the direction of arrow A in this state. Next, the fixing screws 53a, 53b, 53c are attached to the side wall 21 of the back cover 20.
The back cover 20 is attached by inserting it into a small hole (not shown) and fixing it with screws.

In this state, the auxiliary metal fitting 50-1 is rotatably attached to the main body portion 10 at the hook portions 51a to 51f, and the back cover portion 20 is made main body portion by the hook portions 51a to 51f. This means that it is rotatably attached to 10.

Although the auxiliary metal fitting 50-2 is not shown,
The auxiliary metal fitting 50-1 has the same shape.

Next, the procedure of backlight replacement work in the liquid crystal display device with a backlight of this embodiment will be described.

When replacing the backlight 40 in the liquid crystal display device with a backlight of this embodiment, first, a screw (not shown) for fixing the main body portion 10 provided on the back cover portion 20 and the back cover portion 20 together. Remove. In this state, the main body portion 10 and the back lid portion 20 are connected by the auxiliary metal fittings 50-1 and 50-2, so they do not fall, and this screw can be removed by one worker. it can.

When the screws of the back cover 20 are removed, the back cover 2 is attached by using the auxiliary metal fittings 50-1 and 50-2.
0 is rotated with respect to the main body 10. In this state, the backlight 40 is taken out from the main body portion 10, and then the not-shown connector of the backlight 40 is pulled out to replace the backlight.

In this state, the liquid crystal display section 30 is exposed, but since the liquid crystal display section 30 is covered with the light diffusion sheet 60, the liquid crystal display section 30 is not directly exposed to the external environment. The presence of the light diffusion sheet 60 makes it possible to replace the backlight even in an environment with much dust.

Thereafter, the back cover 20 is rotated toward the main body 10, and a screw (not shown) for fixing the back cover 20 to the main body 10 with the back cover 20 joined to the main body 10 is attached. . Even in this state, the case back 20 is not
Since the auxiliary metal fittings 50-1 and 50-2 are connected to No. 0, the back cover 20 does not drop, and this screw mounting work can be performed by one worker.

4 to 7 show another embodiment of the present invention.

In the following drawings, parts having the same functions as those of the embodiment shown in FIG. 1 are given the same reference numerals as those used in FIG. 1 for convenience of explanation.

In FIG. 4, the liquid crystal display device with a backlight according to this embodiment is composed of a main body portion 10 and a back cover portion 20, in which a liquid crystal display portion and a backlight which are not shown are housed.

This liquid crystal display device with a backlight is mounted on a panel 80, and the main body portion 10 having a flange portion 10a on the peripheral edge of the front face is inserted into a liquid crystal display device with a backlight device mounting hole 80a of the panel 80. The back cover 20 is attached to the back side of the main body 10.

FIG. 5 is a view of the liquid crystal display device with a backlight mounted on the panel 80 as seen from the back cover portion 20 side. The main body portion 10 has metal fittings 81 (nine shown in the figure). Fixed to the panel 80 (not shown) with the metal fittings 82 (one shown in the figure), and the back cover 20 is equipped with the metal fittings 83 (two shown on the left side in the figure). It is rotatably attached to the main body 10.
Further, at all times (when the backlight is not exchanged), the back cover 20 is fixed to the main body 10 with screws 84 through holes (not shown) penetrating from the four corners on the back side to the main body 10.

FIG. 6 shows a detailed structure of the metal fitting 81. The metal fitting 81 has an L-shaped metal fitting 71 whose tip 71a is inserted into a hole 10a formed in the main body 10, and a tip. The L-shaped metal fitting 71 is provided with a screw hole (not shown) into which the screw 73 is screwed. This metal fitting 81
When the main body 10 is attached to the panel 80 by means of the above, as shown in FIG.
6 is inserted into the hole 10a formed in the main body 10, and the contact portion 72 at the tip of the screw 73 is brought into contact with the back surface of the panel 80. In this state, as shown in FIG.
The main body 10 is fixed to the panel 80 by tightening with a driver (not shown).

Although the detailed structure of the metal fitting 82 is not shown, it is basically the same as the metal fitting 81.

FIG. 7 shows the detailed structure of the metal fitting 83, and FIG. 8 is a perspective view of the metal fitting 83 seen from the direction B in FIG.

The metal fitting 83 connects the main body 90 and the plate portion 91 with screws 98a, through narrow grooves 97a, 97b provided in the plate portion 91.
The plate portion 91 has a hinge mechanism 91b, and includes a fixed portion 91c fixed to the main body 90 side and a rotating portion 91d rotatable by the hinge mechanism 91b. A cutout portion 91a is provided on the upper portion of the rotating portion 91d, and a lower portion of the main body 90 is bent into an L shape, and a pair of folded portions 92a and 92b are provided. Engagement pieces 92a 'and 92b' are provided on both folding parts 92a and 92b. Furthermore, a U-shaped metal fitting 94 is attached to the back side of the main body 90.
The U-shaped metal fitting 94 has a screw 9 having an abutting portion 96 at its tip.
5 is screwed.

When the metal fitting 83 is attached, the main body 10 and the back cover 20 are fixed with screws 84 (see FIG. 5), and then the main body 90 of the metal fitting 83 and the plate 91 are screwed 98.
a, 98b, and then the rotating portion 91d of the plate portion 91.
Is inserted into the narrow groove 23a formed in the side wall 21 of the back cover portion 20, and the folding portion 9 provided in the lower portion of the main body 90.
One side engaging portion 1 of holes 13a and 13b formed in the main body portion 10 with engaging pieces 92a 'and 92b' of 2a and 92b.
Insert so as to engage with 3a 'and 13b'. Then, next, a driver (not shown) is inserted through the driver insertion port 93 opened at the bottom of the main body 90, and the screw 95 is attached to the panel 8.
The main body 90 of the metal fitting 83 is fixed to the main body portion 10 by pushing the contact portion 96 of the screw 95 to the panel 80 side by pushing it toward the 0 side. Then, in this state, the plate portion 91 is moved upward so that the cutout portion 91a of the rotating portion 91d is moved to the back cover portion 2.
The narrow groove 23a formed in the side wall 21 of No. 0 is locked to the upper portion, and further the screws 98a and 98b in the narrow grooves 97a and 97b are fixed to fix the main body 90 and the plate portion 91.

To replace the backlight in such a structure, first remove the screw 84 (see FIG. 5).
The joined state of the main body 10 and the back cover 20 is released. In this case, since the back cover part 20 is rotatably held on the main body part 10 side by the metal fitting 83, there is no fear of dropping. Here, when the back cover 20 is opened via the metal fitting 83, the first
As in the case of the above embodiment, the backlight can be replaced, and the backlight 40 is taken out from the main body 10 and then the connector (not shown) of the backlight 40 is pulled out to replace the backlight.

In this state, the liquid crystal display section 30 is exposed, but since the liquid crystal display section 30 is covered with the light diffusion sheet 60, the liquid crystal display section 30 is not directly exposed to the external environment. The presence of the light diffusion sheet 60 makes it possible to replace the backlight even in an environment with much dust.

After that, the back cover part 20 is rotated toward the main body part 10, and a screw 83 for fixing the back cover part 20 to the main body part 10 in a state where the back cover part 20 is joined to the main body part 10 is attached. Even in this state, since the back cover 20 is held by the metal fittings 83 with respect to the main body 10, the back cover 20 does not drop, and the work of attaching the screw can be performed by one worker. You can

[0042]

As described above, according to the present invention,
An auxiliary metal fitting for rotatably attaching the back cover part to the main body part is provided, and a light diffusion sheet for protecting the exposed liquid crystal display part when the back cover part is rotated and the backlight is replaced is provided with a liquid crystal. Since it is provided in the display unit, it has the following effects.

1) There is no inconvenience that the back cover part drops when the backlight is replaced, and it becomes possible for one worker to replace the backlight.

2) When the backlight is replaced, the liquid crystal display section is not directly exposed to the environment, and the backlight can be replaced even in an environment with much dust.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a liquid crystal display device with a backlight according to the present invention, and a diagram showing a state when the backlight of the liquid crystal display device with a backlight is replaced.

FIG. 2 is a diagram showing a state when the liquid crystal display device with a backlight shown in FIG. 1 is used.

FIG. 3 is a diagram showing a detailed configuration of the auxiliary metal fitting shown in FIGS. 1 and 2.

FIG. 4 is a view showing another embodiment of the liquid crystal display device with a backlight according to the present invention, showing a state in which the liquid crystal display device with a backlight is attached to a panel.

5 is a view of the liquid crystal display device with a backlight shown in FIG. 4 as viewed from the back cover side with the panel attached.

6 is a diagram showing a detailed configuration of a metal fitting 81 shown in FIG.

7 is a diagram showing a detailed configuration of the metal fitting 83 shown in FIG.

8 is a perspective view of the metal fitting 83 shown in FIG. 7 viewed from the direction B in FIG.

[Explanation of Codes] 10 Main Body 10a Holes 13a, 13b Hole 20 Back Lid 23a Fine Groove 30 Liquid Crystal Display 40 Backlights 50-1, 50-2 Auxiliary Metal Fittings 60 Light Diffusing Sheet 71 L-Shaped Metal Fittings 72 Abutment 73 screw 80 panel 80a backlight liquid crystal display device mounting hole 90 main body 91 plate portion 91a notch portion 91b hinge mechanism 91c fixing portion 91d rotating portion 92a, 92b folding portion 93 hole 94 U-shaped bracket 95 screw 96 contact portion 97a, 97b Fine groove 98a, 98b Screw

Claims (4)

[Claims] 1. A liquid crystal display device with a backlight, comprising a liquid crystal display section and a backlight for illuminating the liquid crystal display section, which is housed in a housing composed of a back cover section and a main body section. An auxiliary metal fitting that is rotatably attached to the main body is provided, and when replacing the backlight, the back cover is rotated with respect to the main body using the auxiliary metal. Backlit liquid crystal display device. 2. The auxiliary metal fitting has, at one end, a plurality of hook portions that respectively engage with a plurality of slit portions of the side wall portion of the main body portion, and at the other end, a plurality of slit portions of the side wall portion of the back cover portion. 2. The liquid crystal display device with a backlight according to claim 1, wherein the liquid crystal display device comprises a plurality of substantially L-shaped metal fittings each having a protrusion that fits into the portion. 3. The auxiliary metal fitting has a first portion having a plurality of hook portions at one end that engage with a plurality of slit portions of the side wall portion of the main body portion, and is rotatable with respect to the first portion. 2. The liquid crystal with a backlight according to claim 1, wherein the liquid crystal is equipped with a plurality of hinge-shaped metal fittings that are freely attached and that have a second portion that has a protruding portion that fits into a slit portion of the side wall portion of the back cover portion. Display device. 4. A drive circuit for a liquid crystal display device with a backlight, comprising a liquid crystal display section and a backlight for illuminating the liquid crystal display section, which is housed in a casing composed of a back cover section and a main body section. An auxiliary metal fitting for rotatably attaching the lid to the main body is provided, and light diffusion for protecting the liquid crystal display exposed when the back lid is rotated to replace the backlight. A liquid crystal display device with a backlight, characterized in that a sheet is provided in the liquid crystal display section.