JPH04288526A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To easily and simply replace a back light by mounting the whole or part of the back light which constitutes a liquid crystal module in a design case independently of an LCD panel. CONSTITUTION:The LCD panel 3 and back light 4 are inserted into the design case 14a independently of each other on the card basket basis of, for example, a printed board, and covered with a design case lid 14b. The design case 14a and design case lid 14b are fixed by engagement. Thus, the back light 4 or fluorescent lamps 5a and 5b constituting it are mounted in the design case 14a independently of the LCD panel 3. Therefore, such an usual waste that the whole LCD module is replaced owing to the breakage of the fluorescent lamps 5a and 5b is eliminated and the back light is easily replaced.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a liquid crystal display device.
The present invention relates to extending the service life of a liquid crystal display device by making a backlight that constitutes a liquid crystal display module easily replaceable.

0002

[Prior Art] Liquid crystal displays (hereinafter abbreviated as LCD) are non-emissive displays, so lighting is required in places with poor outside light conditions. For small LCDs such as watches, simple lighting using mini incandescent light bulbs is used. do. In addition, L used for OA terminals etc.
In order to provide a fresh display, CDs are often equipped with a surface light source (backlight) that uniformly illuminates the LCD panel surface from the rear.

FIG. 8 is an exploded perspective view showing a conventional example of a liquid crystal display device for a personal computer, for example. In the figure, reference numeral 1 denotes, for example, an LCD cell made of glass, which is housed in a frame-shaped metal case 2 to constitute an LCD panel 3. Reference numeral 4 denotes a backlight, which is composed of fluorescent lamps 5a, 5b, a light guide 6, reflection plates 7a, 7b, and a backlight case 8 for storing these members. The light from the fluorescent lamp 5 is converted into a surface light source by a light guide 6 to illuminate three surfaces of the LCD panel. 9a, 9b... are the sockets of the fluorescent lamp 5, and the lead wire 1 is connected from the socket 9.
3a, 13b... are pulled out, and a lighting device (not shown) is pulled out.
is connected to. LCD using screws 10a and 10b
The LCD module 100 is configured by fixing the panel 3 to the backlight 4. Reference numerals 11a and 11b designate cases, and the LCD module 100 is fixed to the front member 11a using screws 12a and 12b, for example. A liquid crystal display device 200 is configured by covering with the rear member 11b.

Note that a lighting device (not shown) for operating the fluorescent lamp 5 may be installed inside the liquid crystal display device 200 or outside the liquid crystal display device.

In the liquid crystal display device 100, the backlight 4, particularly the fluorescent lamp 5, has the shortest service life. So when I try to replace backlight 4, the design case 11
Possible methods include removing the rear member 11b and removing the screws 12 to replace the entire LCD module 100, or removing the screws 10 and replacing the backlight 4. In any of the replacement methods, the liquid crystal panel 3, which is a precision component, will be touched with one's hand, which is undesirable as there is a risk of damaging the LCD cell 1 made of glass, for example. Furthermore, in the latter method, the expensive liquid crystal panel 3 is also replaced, which is something that should be avoided if possible.

[0006]

[Problem to be solved by the invention] As explained above,
In conventional liquid crystal display devices, when the backlight of the LCD part deteriorates and loses its illumination effect, the entire LCD module must be replaced, which is uneconomical and difficult to perform, making it difficult for the end user to However, it is almost impossible to do this directly; for example, it can only be done at the manufacturer's service desk.

The present invention has been made in order to solve the above-mentioned problems, and aims to provide a liquid crystal display device in which backlight replacement is simple and easy, and even an end user can perform this replacement.

[0008]

[Means for Solving the Problems] A liquid crystal display device according to the present invention is one in which the whole or a part of the backlight constituting a liquid crystal module is mounted in a designed case independently of the LCD panel.

[0009]

[Operation] In the liquid crystal display device of the present invention, only the backlight can be easily replaced without touching the liquid crystal panel, which is an expensive precision component.

0010

[Example] Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment in which the liquid crystal display device of the present invention is applied to a personal computer. In the figure, 1 is the LCD cell, 2 is the frame-shaped metal case that houses it, 3 is the LCD panel, and 4 is the backlight, which is the fluorescent lamp 5.
a, 5b, a light guide 6, reflection plates 7a, 7b, and a backlight case 8 for storing these members. 9a,
9b... is a socket for the fluorescent lamp 5, and lead wires 13a, 13b are drawn out from the socket 9 and connected to a lighting device (not shown). 14 is the design case itself.
A is a design case, and 14b is a design case lid. The fluorescent lamp 5 will be described below using a cold cathode tube as an example.

The LCD panel 3 and the backlight 4 are each independently inserted into the design case 14a using, for example, a printed circuit board card basket method, and the design case lid 1 is inserted into the design case 14a.
4b. The design case 14a and the design case lid 14b are fixed by fitting.

Next, a method for replacing the backlight 4 in the display device of the present invention will be explained. First, the design case lid 14
b, then pinch the ears of backlight case 8 with your fingers and pull it up. By removing the lead wire 13 from the lighting device (not shown), the backlight that has reached the end of its useful life can be taken out. To store a new backlight, simply follow the reverse procedure of the above explanation.

Note that the design case 14a and the backlight 4
If male and female fixed connectors are installed between them, the connection to the lighting device (not shown) can be turned on and off at the same time when the backlight storage case 8 is pulled up or inserted.

Furthermore, since the LCD panel 3 does not need to be inserted or removed, it may be fixed to the design case 14a. In short, it is sufficient that the backlight 4 can be inserted into the design case 14a independently of the LCD panel 3.

Further, in the above embodiment, the backlight 4 and the design case lid 14b are separated, but if the design case lid 14b is integrated with the backlight case 8, the design case lid 14b can be removed. Similarly, the backlight 4 can be pulled out, making replacement work easier.

Example 2. In the first embodiment, the entire backlight 4 is replaced. Next, FIG. 2 shows an example of a liquid crystal display device of the present invention in which only the fluorescent lamp 5 can be replaced.

A holding mechanism for the fluorescent lamp 5 is formed on the designed case lid 14b. When the design case cover 14b is removed, the fluorescent lamp 5 is removed from the backlight 4 together with it.
This system allows only the lamp to be replaced. In this case, the fluorescent lamps 5 of some members constituting the backlight 4
It is sufficient that only the backlight can be installed in the design case 14a independently of the LCD panel 3, and other members constituting the backlight may be combined with the LCD panel 3.

FIG. 3 is a sectional view showing an example of a holding mechanism for the fluorescent lamp 5 formed on the decorative case lid 14b. In the fluorescent lamp 5 used in this embodiment, as shown in FIG. 4, for example, caps 17a and 17b are used as terminals for conducting electricity, and constrictions 18a and 18b are formed. Design case lid 1
The structure is such that the constriction 18 of the cap 17 of the fluorescent lamp 5 fits into the claws 20a, 20b in the holes 19a, 19b provided in the fluorescent lamp 4b.

When the fluorescent lamp 5 is inserted into the backlight 4 and the decorative case lid 14b is placed in a predetermined position, the fluorescent lamp 5 is fixed in the hole 19 provided in the decorative case lid 14b. The hole 19 is provided with terminals 21a and 21b for connection to a lighting device (not shown), and when the decorative case 14a and the decorative case lid 4b are fitted and fixed, the terminals formed in the backlight case 8 are provided. It has a structure that makes contact with 22a. The terminal 22a is connected to a lighting device via a lead wire 13a.

Example 3. In Example 2, the design case lid 1
4b covers almost the entire upper end surface of the liquid crystal display device 200, but in order to replace only the fluorescent lamp 5, the fifth
As shown in the figure, the design case 20 has two holes necessary for inserting and removing the fluorescent lamp 5, and the design case piece 23a
, 23b may be configured to cover the design case 20. It goes without saying that the design case piece 23 is provided with terminals 21a and 21b for connection to a holding mechanism for the fluorescent lamp 5 and a lighting device (not shown), similar to the second embodiment.

[0021] In addition to fixing the fluorescent lamp 5,
A socket 9 (partly not shown) that serves to supply electricity to the backlight 4 is provided in the backlight 4 in the first embodiment, but the socket 9 in the second and third embodiments is characterized by being formed on the design case side. It is.

[0022] The socket 9 has two fluorescent lamps 5 each.
pcs are required. It is sufficient that at least one of the sockets 9 is formed in the designed case 20. Of course Figure 6
, as shown in FIG. 7 (A-A sectional view of FIG. 6), both sockets may be formed in the designed case 20. In this way, compared to the case where only one socket 9a, 9b is provided in the design case, the liquid crystal module 100 and the design case 2 are
A feature is that the fluorescent lamp 5 is less likely to get stuck when inserted or removed due to misalignment of the fluorescent lamp 5.

[0023] In the above explanation, the fluorescent lamp was explained using a cold cathode tube as an example, but even in the case of a hot cathode tube, the number of wires required for energization is two per lamp socket.
It goes without saying that the present invention can be applied even if the structure of the socket is slightly more complicated than that of a single cold cathode tube.

[0024]

As described above, according to the present invention, the backlight or the fluorescent lamps constituting it are mounted in the design case independently of the LCD panel, so that the entire LCD module can be damaged due to the decay of the fluorescent lamps. This eliminates the uneconomical cost of replacing the backlight, and makes it possible to easily replace the backlight.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a liquid crystal display device showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view of a liquid crystal display device showing another embodiment of the present invention.

FIG. 3 is a sectional view showing the structure of the designed case lid in the embodiment of the present invention.

FIG. 4 is a sectional view showing the shape of a fluorescent lamp in an embodiment of the present invention.

FIG. 5 is an exploded perspective view of a liquid crystal display device showing another embodiment of the present invention.

FIG. 6 is an external view and a sectional view of a liquid crystal display device showing another embodiment of the present invention.

FIG. 7 is a sectional view taken along line AA in FIG. 6;

FIG. 8 is an exploded perspective view of a conventional liquid crystal display device.

[Explanation of symbols]

3 LCD panel 4 Backlight 5a, 5b Fluorescent lamp 14a, 14b Design case 23 Design case piece

Claims (3)

[Claims] Claim 1: A liquid crystal module comprising a liquid crystal panel and a backlight, the backlight;
Or a liquid crystal display device characterized in that some of its constituent parts are mounted in a designed case independently of other parts. 2. The liquid crystal display device according to claim 1, further comprising a designed case lid that fits into one base of the fluorescent lamp. 3. The liquid crystal display device according to claim 1, wherein all sockets for the fluorescent lamps are formed in a designed case.