JP2001125101A - Liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain good lighting for a long period of time as a back light is protected even if electric wires for electric powder input of the back light are pulled. SOLUTION: The liquid crystal display device 16 is constituted by disposing a liquid crystal panel 4 an the back light 3 in a casing 2a and drawing out the input wiring 7 and 8 through a passage 21 formed in this casing 3a. Projecting bodies 22 are formed on the inside surface of the passage 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a liquid crystal display device provided with a backlight having a light source such as a cold cathode tube.

[0002]

2. Description of the Related Art In recent years, personal computers, word processors, televisions, digital cameras, video cameras,
Fish finder, portable positioning system (Global Positio
The application of a liquid crystal display device to a GPS (Ninging System: GPS) and the like is being promoted.

[0003] Normally, a liquid crystal display device is provided with a backlight on the back side of a liquid crystal panel, and the luminance is increased by the backlight.

[0006] The structure of a conventional liquid crystal display device 1 will be described with reference to FIGS. 6 and 7. FIG. 6 is a plan view seen from the backlight side, and FIG. 7 shows a main part of wiring for inputting power to a light source (for example, a cold cathode tube or the like) of the backlight.

According to the liquid crystal display device 1 shown in FIG. 6, reference numeral 2 denotes a housing, in which a backlight 3 and a liquid crystal panel 4 are arranged in an overlapping manner. In FIG. 1, a liquid crystal panel 4 is arranged behind the backlight 3.

The backlight 3 has a light guide plate 5 and a cold cathode tube 6 provided on an end face of the light guide plate 5 as main components. Light emitted from the cold cathode tube 5 enters the light guide plate 5, and the light guide plate 5 Are irradiated from the main surface of the liquid crystal panel 4, thereby projecting the liquid crystal panel 4.

In order to supply power to the cold cathode tube 5, input wires 7, 8 are connected to both ends of the cold cathode tube 6, respectively, and these input wires 7, 8 are collectively brought out from a part of the housing 2. are doing.

FIG. 7 shows a structure for fixing the input wirings 7 and 8. Since the housing 2 is formed of a hard resin, a passage 9 is formed at a corner of the housing 2 so that the input wirings 7 and 8 are fixed with the formation. Further, one end of the cold-cathode tube 6 is connected and fixed to one end of the input wiring 7 in a direction orthogonal to the longitudinal direction, and is routed so as to get over the wall 10. With the input wiring 8 connected and fixed, it is drawn out of the housing 2 through the passage 9. The ends of these input wirings 7 and 8 are connected to a connector 11.

According to the backlight 3 having the above structure, the wall 1
The input wirings 7 and 8 are buried by the wiring fixing structure of 0 and the passage 9, and in this state, the power is applied to the cold cathode tubes 6 of the backlight 3 to light them.

[0010]

However, the liquid crystal display device 1 provided with the backlight 3 having such a configuration is incorporated into various electronic devices or the like, or the connector 11 or the input wiring 7 is not provided due to handling. , 8 may be pulled, which may cause damage to the cold cathode fluorescent lamp 6.

This point will be described with reference to FIGS. FIG. 8 is a plan view of the liquid crystal display device 1 for explaining this problem, and FIG. 9 is a plan view of the liquid crystal display device 1 shown in FIG.
FIG. 10 is an enlarged view of a region B. FIG.

In the area A of the liquid crystal display device 1, the input wiring 7 is formed by coating a metal cord with an electrically insulating resin, and the cord is connected to the cord of the cold cathode tube 6 and the connecting portion 12. Tied. When the input wiring 7 is pulled and fully extended, a considerable stress is applied to the terminal portion 13 which is the base of the cord of the cold cathode tube 6, and if the input wiring 7 is pulled to exceed the breaking strength, the terminal portion 13 is broken. It had been.

Similarly, in the region B of the liquid crystal display device 1 shown in FIG. 10, the cord of the input wiring 8 is connected to the cord of the cold-cathode tube 6 at the connection portion 14 so that the input wiring 8 exceeds the breaking strength. When pulled, the terminal 15 which is the base of the cord of the cold cathode tube 6 was broken.

Accordingly, the present invention has been completed in view of the above circumstances, and its purpose is to protect a light source even if a power input wire connected to a light source of a backlight (such as a cold cathode tube) is pulled. Another object of the present invention is to provide a highly reliable and high quality liquid crystal display device which maintains good lighting for a long period of time.

[0015]

According to the liquid crystal display device of the present invention, a liquid crystal panel and a backlight are disposed in a housing, and a power source for inputting power from a light source of the backlight through a passage formed in a part of the housing. The device is configured to draw out an electric wire, wherein an electric wire locking projection is formed on an inner surface of the passage.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIGS. FIG. 1 is a schematic plan view of the liquid crystal display device 16, and FIG.
3 is a schematic cross-sectional view of the liquid crystal display device 16 taken along the line XX in FIG. 3, and FIG. 4 and 5 are enlarged views showing the electric wire locking projection. The same parts as those of the conventional liquid crystal display device 1 are denoted by the same reference numerals.

Similarly to the liquid crystal display device 1, the liquid crystal display device 16 has the backlight 3 and the liquid crystal panel 4 for displaying images superimposed and held inside the housing 2a.

The liquid crystal panel 4 is formed by bonding two glass substrates on which electrodes are patterned through a sealing material and sealing the liquid crystal, thereby defining an effective display area in which an image is displayed. An effective light emitting area is also defined in the backlight 3 so as to face the effective display area.

As shown in FIG. 2, the backlight 3 has a light diffusing plate 17 formed on one surface of a flat light guide plate 5 made of a transparent acrylic resin and a light reflecting plate 18 formed on the other surface. One or a plurality of lens sheets 19 for condensing light may be provided on the light diffusion plate 17. A cold cathode tube 6 serving as the light source is provided on an end surface of the light guide plate 5, and further covers the reflector 20. Light emitted from the cold cathode tube 6 is reflected by the reflector 20 and guided into the light guide plate 5.

An input wiring 7 and an input wiring 8 are connected to both ends of the cold cathode tube 6, respectively. For example, the input wiring 7 is provided on the high voltage side, and the input wiring 8 is provided on the low voltage side. The input wirings 7 and 8 are housed in the housing 2a together with the cold cathode tubes 6.

According to the fixed structure of the input wirings 7 and 8 shown in FIG. 3, the housing 2a is formed of a hard resin, so that the input wirings 7 and 8 are accommodated with this molding. A passage 21 is formed in the housing 2a.

One end of the input wiring 7 is connected and fixed to one end of the cold cathode tube 6 in a direction orthogonal to the longitudinal direction. Therefore, the wall 10 is provided in a part of the passage 21, and the input wiring 7 is routed so as to run over the wall 10.
To form

In the input wiring 8 connected and fixed to the other end of the cold cathode tube 6, the input wiring 8 is accommodated along the cold cathode tube 6.

The input wirings 7 and 8 are connected to the passage 21.
Through the input wires 7 and 8, the cold cathode tube 6 of the backlight 3 is lit by applying power to the cold cathode tube 6 through the input wires 7 and 8. .

According to the present invention, when the input wirings 7 and 8 are embedded in the passage 21 as described above, the projections 22 serving as the wire locking projections are provided on the inner surface of the housing 2a near the outside of the passage 21. A plurality is formed. Since the input wires 7 and 8 are formed by coating a metal cord with an electrically insulating resin, the protrusion 22 hits the resin layer, bites in and is locked.

The projection 22 is preferably shaped so that such locking action is most effective. For example,
A structure having a triangular cross section or a pyramid shape is effective.

Thus, according to the liquid crystal display device 16 of the present invention, since the projections 22 are formed on the inner surface of the passage 21 of the housing 2a, even if the connector 11 or the input wires 7, 8 are pulled, the projections 22 The input wirings 7 and 8 in the housing 2a cannot be extended, so that the terminal portions 13 and 1, which are the bases of the cords of the cold cathode tubes 6 as in the conventional case, are not provided.
5 was no longer stressed and no longer broken.

Preferred Embodiments In the liquid crystal display device 16 of the present invention, FIGS. 4 and 5 show a structure in which the function of locking the projections 22 to the input wirings 7 and 8 is maximized. FIG. 4 is an enlarged view of the vicinity of the inner surface of the passage 21 where the protrusion 22 is formed, and FIG. 5 is an enlarged view of a region C shown in FIG.

It is preferable that a plurality of protrusions 22 are arranged on both sides of each passage 21. When the protrusions 22 have a triangular cross section, the outer base angle θ1 and the inner base angle θ2 are Is such that θ1 <θ2.
As a result, the protrusions of the protrusions 22 face the inside of the passage 21, so that the protrusions 22 are more likely to be caught in the input wirings 7, 8 as a resin, and as a result, a maximum locking action is obtained.

Next, the present inventor has proposed the liquid crystal display device 1 of the present invention.
6 and the input wires 7 and 8 of the conventional liquid crystal display device 1 were measured for tensile strength, and the following results were obtained. In the liquid crystal display device 16 of the present invention, the housing 2a having the structure of the preferred example was used.

The measurement of the tensile strength was performed as follows. That is, the input wiring 7 was pulled outward by a push-pull gauge horizontally, and the tensile strength was determined as the strength until the end of the cold cathode tube 6 was broken or the coating of the wiring was broken. Similarly, the input wiring 8 is also pulled outward by a push-pull gauge horizontally, and the tensile strength is determined by the strength until the end of the cold cathode tube 6 is broken or the coating of the wiring is broken. did.

6. Input wiring of the liquid crystal display device 16 of the present invention . . 5.0kg input wiring . . 5.0 kg conventional liquid crystal display device 1 input wiring 7. . . 0.5kg input wiring . . 1.0 kg As is clear from the above measurement results, the liquid crystal display device 16 of the present invention is superior in the tensile strength to the conventional liquid crystal display device 1.

It should be noted that the present invention is not limited to the above embodiment, and various changes and improvements can be made without departing from the scope of the present invention. For example, protrusions 22a as shown in FIG.
The protrusion 22b as shown in FIG. 12 may be used. Protrusion 22
Although a is also triangular in cross section, it is acutely angled so that the projection is further inward. The protrusion 22b has a structure in which the protrusions 22 are combined.

[0034]

As described above, according to the liquid crystal display device of the present invention, the liquid crystal panel and the backlight are disposed in the housing, and the power from the backlight light source is passed through a passage formed in a part of the housing. In the device configuration in which the input wire is drawn out, by forming the wire locking projection on the inner surface of the passage, even if the power input wire is pulled, the power input wire is suppressed or suppressed, and thereby the light source of the backlight As a result, the backlight is protected, and as a result, a high-reliability and high-quality liquid crystal display device that maintains good lighting for a long period of time can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a liquid crystal display device of the present invention.

FIG. 2 is a schematic cross-sectional view of the liquid crystal display device taken along the line XX in FIG.

FIG. 3 is an enlarged view of a main part of a wiring for power input of a backlight according to the present invention.

FIG. 4 is an enlarged view showing the vicinity of an electric wire locking projection.

FIG. 5 is an enlarged view of an electric wire locking projection.

FIG. 6 is a schematic plan view of a conventional liquid crystal display device.

FIG. 7 is an enlarged view of a main part of a wiring for power input of a conventional backlight.

FIG. 8 is a schematic plan view of a conventional liquid crystal display device.

FIG. 9 is an enlarged view of a region A of the conventional liquid crystal display device.

FIG. 10 is an enlarged view of a region B of the conventional liquid crystal display device.

FIG. 11 is an enlarged view showing the vicinity of another electric wire locking projection.

FIG. 12 is an enlarged view showing the vicinity of another electric wire locking projection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 16 Liquid crystal display device 2, 2a Case 3 Backlight 4 Liquid crystal panel 5 Light guide plate 6 Cold cathode tube 7, 8 Input wiring 9, 21 Passage 22, 22a, 22b Projection

Claims (1)

[Claims] 1. A liquid crystal display device in which a liquid crystal panel and a backlight are disposed in a housing, and a power input wire is drawn from a light source of the backlight through a passage formed in a part of the housing. A liquid crystal display device, wherein an electric wire locking projection is formed on an inner surface of the passage.