JP2001188221A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that there is a possibility incapable of operating a backlight due to disconnection of lead wire or breakage of a cold cathode discharging tube caused by external force applied to high voltage side lead wire of the cold cathode discharging tube constituting the backlight of a liquid crystal display device. SOLUTION: The liquid crystal display device is equipped with the liquid crystal display screen 1, a metal frame 8 to store the liquid crystal display screen 1, the cold cathode discharging tube 6 used as the backlight for the liquid crystal display screen 1 and a lead wire 2a of the high voltage side to supply power to the cold cathode discharging tube 5. The lead wire 2a of the high voltage side is wired to be stored inside the metal frame 8 in a state bent at a specified distance from the base 6 of the joint part with the cold cathode discharging tube, and then to be pulled out from the base side part of the metal frame 8 or from the apex pat of the base side to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device having a lead-out mechanism of a cold cathode discharge tube constituting a backlight of a liquid crystal display screen.

[0002]

2. Description of the Related Art Liquid crystal display devices have advantages such as small size, light weight, and low power consumption. Therefore, in recent years, technologies such as research, development, and manufacturing have been rapidly advanced and have become widespread in various fields. Is coming. In particular, word processors,
Liquid crystal display devices are widely used in the field of OA equipment such as a sonar computer (hereinafter, referred to as a PC) and a monitor.

Recently, display screens of devices such as notebook PCs and personal digital assistants have become larger and larger.
Or, a reduction in the weight of a display device has been demanded, and accordingly, a liquid crystal display device used for a display device of such a device has also been strongly demanded to have a larger display screen. Is coming.

FIG. 6 is a front view of a conventional liquid crystal display device. In FIG. 6A, reference numeral 1 denotes a display screen of a liquid crystal display device, 2a denotes a high voltage side lead wire of a cold cathode discharge tube for a backlight incorporated in the liquid crystal display device, and 2b denotes a GND side lead of the cold cathode discharge tube. Line (ground line), 3 is a connector used for connection to an inverter (not shown) for lighting the cold cathode discharge tube, 8 is a metal frame, 9 is a notebook PC housing for accommodating a liquid crystal display device. It is a shape. recent years,
Due to the enlargement of the display screen, the width of the metal frame 8 shown in FIG.

Next, FIG. 5 shows a cold cathode discharge tube 5 and a lead wire (ground wire) 2b in the conventional liquid crystal display device shown in FIG.
FIG. 4 is a partial cross-sectional view showing a joint portion with the above. In FIG.
The same reference numerals as those in FIG. 6 denote the same or corresponding parts, and 4 denotes a rubber holder made of silicone resin for protecting the high-pressure part.
5 is a cold cathode discharge tube. It is said that the dimension d in the drawing is required to be 5 mm or more for product safety.

[0006]

However, a notebook PC
When the conventional liquid crystal display device as described above is incorporated into a notebook PC case in the manufacturing process, there is room for an inverter (not shown) on the left and right sides of the inner shape 9 of the notebook PC case. Since there is no inverter, the inverter is disposed below the inside of the notebook PC case.

At this time, as shown in FIG. 6B, in order to connect to the inverter, the high voltage side lead wires 2a, GN
Both the D-side lead wire (ground wire) 2b and the connector 3 need to be bent downward in the figure, but the lead wires 2a, 2b
An extra dimension indicated by D1 in the figure due to the size of b and the like is required, and the liquid crystal display device cannot be incorporated in a notebook PC housing as it is.

Therefore, as shown in FIG. 4, lead wires 2a and 2b are drawn out from the lower right of the liquid crystal display device,
A technique for eliminating the surplus dimension D1 shown in FIG. 6B has been proposed.

However, as described above, the lead wires 2a,
Changing the drawing method of 2b causes the following problems. That is, as described above, since the dimension of the rubber holder 4 shown in the figure d is required to be 5 mm or more for product safety, the rubber holder 4 is arranged based on the above-described drawing method as shown in FIG. The rubber holder 4 looks like it jumps out of the metal frame 8 of the liquid crystal display device.

Therefore, when handling this liquid crystal display device, an external force indicated by arrows A and B in FIG.
, Stress is applied to the base 6 of the high-voltage side lead wire 2a and the vicinity thereof, and the high-voltage side lead wire 2a breaks,
Alternatively, there is a possibility that the backlight does not operate because the cold cathode discharge tube 5 is damaged.

The present invention has been made in view of such a problem, and by changing a method of drawing out a lead wire for a backlight of a liquid crystal display device, a problem that the backlight does not light up when handling is prevented. It is an object to provide a liquid crystal display device.

[0012]

In order to achieve the above object, a liquid crystal display device according to the present invention comprises a liquid crystal display screen,
A frame accommodating the liquid crystal display screen, a cold-cathode discharge tube used for a backlight of the liquid crystal display screen, and a frame that is exposed to the outside from one side or an end corresponding to the bottom of the liquid crystal display screen. A high-voltage side lead wire for supplying electric power to the cold cathode discharge tube, wherein the high voltage side lead wire has a predetermined length inside the frame from a joint with the cold cathode discharge tube. After being stored in a bent state, it is wired so as to be drawn out of the frame.

It is preferable that the bending state of the predetermined length inside the frame of the high-voltage side lead wire is U-shaped.

Further, the high voltage side lead wire may be integrated with a ground wire used for the liquid crystal display screen.

With this configuration, even when an external force is applied to the lead wire of the cold cathode discharge tube used for the backlight of the liquid crystal display device, the cold cathode discharge tube is not broken at the root of the high voltage side lead wire and the cold cathode discharge tube is not broken. In addition, it is possible to prevent a failure phenomenon that the backlight does not operate from appearing.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a partial sectional view showing a configuration of a liquid crystal display device according to Embodiment 1 of the present invention. In FIG. 1, 2a is a high-voltage side lead wire of the cold cathode discharge tube 5, 2b is a GND side lead wire (ground wire), 4 is a rubber holder made of silicone resin for protecting a high voltage portion, 5 is a cold cathode discharge tube, Reference numeral 6 denotes a base of the high-voltage side lead wire, 8 denotes a metal frame, and 9 denotes an inner part of a notebook PC housing. The metal frame 8 is substantially rectangular, and of the four sides, a side 8a and a bottom 8b are shown in FIG. The symbol d in the figure indicates a dimension required for product safety, and currently d is required to be 5 mm or more. Symbols A and B in the figure indicate external forces applied to the high-voltage side lead wire portion.

As shown in FIG. 1, in the present embodiment, the high voltage side lead wire 2a of the liquid crystal display device extends from the connection portion with the cold cathode discharge tube 5 to the inside of the liquid crystal display device once, The liquid crystal display device has a configuration in which the liquid crystal display device is again exposed to the outside of the metal frame 8 after being bent into a U-shape.

In the present embodiment, with the above-described configuration, even if external forces A and B are applied to the high-voltage side lead wire 2a, these external forces can be absorbed by the U-shaped portion. Therefore, it is possible to prevent external force from being applied to the root 6 of the high-voltage side lead wire and its vicinity at the time of assembling such as incorporation into another device, and to avoid disconnection of the lead wire and breakage of the cold cathode discharge tube 5 due to this. Thus, non-lighting of the cold cathode discharge tube 5 can be prevented.

In the present embodiment, the high voltage side lead wire 2a is described as being miniaturized and housed so as to be exposed from the bottom of the metal frame 8, but the present invention is not limited to this. It is not limited to, for example,
The metal frame 8 may be exposed from a portion parallel to the left and right sides of the housing 9 of the notebook PC.

(Embodiment 2) FIG. 2 is a partial sectional view showing a structure of a liquid crystal display device according to Embodiment 2 of the present invention. In the present embodiment, as shown in the drawing, a contraction tube 7 for bundling a high-voltage side lead wire 2a and a GND side lead wire (ground wire) 2b into one is added to the configuration of the first embodiment. I have.

In this embodiment, as described above, the lead wires are integrated by using the shrinkable tube 7, so that the external forces A and B can be applied to the high-voltage side lead wire 2a and the GND-side lead wire (ground wire) 2b. With the configuration described above, the external force can be more effectively prevented from being applied to the root 6 of the high-voltage side lead wire and the vicinity thereof as compared with the first embodiment.

In this embodiment, the lead wire 2a has a U-shaped curve. However, the present invention is not limited to this. Any configuration is possible as long as the configuration is curved.

[0024]

As described above, the present invention absorbs the influence of the external force on the soldering root, prevents the internal structure from being damaged, and prevents the backlight from being turned off during the manufacturing process. Liquid crystal display device can be provided.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a configuration of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view illustrating a configuration of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing a configuration of a liquid crystal display device according to a conventional technique.

FIG. 4 is an external view of a conventional liquid crystal display device.

FIG. 5 is a partial cross-sectional view showing a configuration of a liquid crystal display device according to a conventional technique.

6A and 6B are external views of a liquid crystal display device according to a conventional technique.

[Explanation of symbols]

Reference Signs List 1 Display screen of liquid crystal display device 2a High-voltage lead wire of cold cathode discharge tube 2b GND lead wire of cold cathode discharge tube 3 Connector 4 Rubber holder 5 Cold cathode discharge tube 6 Connection point between high-voltage side lead wire and cold cathode discharge tube ( 8 Metal frame 8a Side of metal frame 8b Bottom of metal frame 9 Inner shape of notebook PC case

Claims (3)

[Claims] 1. A liquid crystal display screen, a frame accommodating the liquid crystal display screen, a cold cathode discharge tube used for a backlight of the liquid crystal display screen, and a bottom part of the liquid crystal display screen of the frame. A high-pressure lead for supplying power to the cold-cathode discharge tube, which is exposed to the outside from one side or an end thereof, and The liquid crystal display device is arranged so that it is stored inside the frame in a state of being bent by a predetermined length and then drawn out of the frame. 2. The liquid crystal display device according to claim 1, wherein a bending state of the predetermined length of the high-voltage side lead wire inside the frame is U-shaped. 3. The liquid crystal display device according to claim 1, wherein the high-voltage side lead wire is integrated with a ground wire used for the liquid crystal display screen.