JPH10206847A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need to specially provide a wiring space for a light source and to make the liquid crystal display device small-sized by adopting a structure which uses an insulation type wire material made thin at the wiring part of the light source. SOLUTION: A main reflector 4 is fitted to the front end pair 12 of a light guide plate 1 while surrounding the light source 3 and guides the light from the light source 2 to the light guide plate 1 with efficiency. The wiring part 5 consists of a high-voltage side wire 5A and a low-voltage side wire 5B and supplies electric power to the light source 3. Namely, the device is equipped with the low-voltage side wire 5B which is formed of a beltlike insulated wire material. This low-voltage wire 5B is grounded in a necessary place 1 when necessary to increase the safety and reduce mixture of noise. On a circuit board 6 which controls 2 liquid crystal plate 2, the low-voltage side wire 5B of the light source 3 is patterned and provided. Thus, the insulation type wire material which is made thin at the wiring part of the light source 3 is used to eliminate the need to provide a space for the wiring part.

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 in which a wiring portion of a backlight light source is made small.

[0002]

2. Description of the Related Art As described below, a conventional liquid crystal display device has a structure in which a space occupied by a low-voltage side wiring 105B, which is routed by an insulating line, in a wiring part of a backlight power supply is large. The liquid crystal display device has become larger as a whole. That is, the conventional liquid crystal display device is shown in FIG.
(Perspective view, but outer frame 1 for clarity
07 is omitted) and FIG. 3b (cross-sectional view), an illuminating surface 1011A composed of a planar light-transmitting member and having a front surface 1011 composed of a lens film or the like, and a back surface 1014 and a side. A light guide plate 101 having a sub-reflector formed of a reflective film or the like on an end face 1013;
A light source 10 that is arranged close to a front end face 1012 of the light guide plate 101 and generates light guided into the light guide plate 101.
3, a liquid crystal plate 102 disposed in front of the illuminating surface 1011A of the light guide plate 101 and controlling transmission of light guided through the light guide plate 101 by an electric signal, and a light source at a front end 1012 of the light guide plate 101. There is a main reflector 104 attached around 103 and a wiring section 105 for supplying power to the light source. Of these, the low-voltage side wiring 105B is disposed insulated at the rear of the main reflector 104. And these were configured to fit in the outer frame 107.

A conventional liquid crystal display device is constructed as described above, and is supplied through a wiring portion 105 to turn on a light source 103 by a power source.
11A is illuminated from behind the liquid crystal plate 102. Liquid crystal panel 102
Since the transmission of light at locations corresponding to respective pixels is controlled by an electric signal and a required screen is drawn on the liquid crystal panel 102, the light guided to the illumination surface 1011A is drawn on the liquid crystal panel 102. Can be seen from the front. In addition,
A control signal supplied to the liquid crystal panel 102 from the outside is supplied to the liquid crystal panel 102 via the circuit board 106.

[0004]

The conventional liquid crystal display device has the above-described structure, and the main reflector 10
4, the insulated low-voltage side wiring 105B for supplying power to the light source is arranged at the rear part.
Is large, and as a result, the external dimensions of the entire liquid crystal display device are increased.

The present invention has been made to solve this problem, and it is an object of the present invention to provide a liquid crystal display device in which the configuration of a wiring portion 105 having a conventional structure is improved and the external dimensions are reduced.

[0006]

A liquid crystal display device according to the present invention has a flat light guide plate having an illumination surface for emitting light introduced from the front end face to the outside from the front face, and illumination of the light guide plate. A liquid crystal plate disposed on the front side of the surface and controlling transmission of light by an electric signal supplied through a circuit board; a light source disposed in parallel with and close to a front end surface of the light guide plate; and the light guide plate A main reflector attached to the front end of the light source so as to surround the light source, and a low-voltage side wiring of the light source constituted by a strip-shaped insulated wiring material.

Further, the low voltage side wiring of the light source is constituted by the conductive pattern. Further, the low-voltage side wiring of the light source is disposed on the circuit board. The low-voltage side wiring of the light source is arranged on the front surface of the light guide plate. Further, the low-voltage side wiring of the light source is disposed on the back surface of the light guide plate. The low-voltage side wiring of the light source is formed on the main reflector. Further, the low-voltage side wiring of the light source is arranged along the end face of the light guide plate except for the front end face. The low-voltage side wiring of the light source is disposed at an end of a lens film provided on the front surface of the light guide plate.

Further, the low-voltage side wiring of the light source is constituted by a transparent conductive film disposed on the front end face of the light guide plate. In addition, the transparent conductive film has a mesh-shaped conductor that transmits light. ,

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a diagram showing Embodiment 1 of the present invention.
FIG. 2 is a configuration diagram shown in a cross-sectional view of a liquid crystal display device according to various examples. First, what is common to these embodiments will be described with reference to FIG. 1A. In FIG. 1A, reference numeral 1 denotes a light guide plate, which has an illuminating surface 11A provided on a front portion 11 which is formed of a planar light transmitting member and emits light introduced from a front end portion 12 to the outside. 2 is a liquid crystal plate, and the light guide plate 1
The light transmission is controlled by an electric signal supplied through the circuit board 6. Reference numeral 3 denotes a light source, which is disposed in parallel with and close to the front end face 12 of the light guide plate 1.

Reference numeral 4 denotes a main reflector which is attached to the front end 12 of the light guide plate 1 so as to surround the light source 3 and guides light from the light source 3 to the light guide plate 1 efficiently. Reference numeral 5 denotes a wiring portion, which includes a high-voltage side wiring 5A and a low-voltage side wiring 5B, and supplies power to the light source 3. Reference numeral 6 denotes a circuit board on which a circuit for converting a control signal sent from the outside into a signal suitable for the liquid crystal panel 2 is provided. Note that various embodiments may be created depending on where and how the low-voltage side wiring 5B of the wiring section 5 is arranged.
In addition, the low-voltage side wiring 5B is grounded at a necessary place as necessary, so that safety is enhanced and noise contamination can be reduced.

First, in the case of the first embodiment, as shown in FIG. 1A, a light source 3 is placed on a circuit board 6 for controlling the liquid crystal panel 2.
Are provided by patterning.

In the second embodiment, as shown in FIG. 1B, a low-voltage side wiring 5B of the wiring section 5 is formed by putting a patterning or thin wiring sheet on the end of the front surface 11 of the light guide plate 1.
It is assumed that.

In the third embodiment, as shown in FIG. 1C, a low-voltage side wiring 5B of the wiring section 5 is formed by attaching a patterning or thin wiring sheet to the end of the back surface 14 of the light guide plate 1.
It is assumed that.

In the fourth embodiment, as shown in FIG. 1D, a low-voltage-side wiring 5 is formed by attaching a patterning or thin wiring sheet formed by vapor deposition or the like disposed on the main reflector 3.
B.

In the fifth embodiment, as shown in FIG. 1E, a low-voltage side wiring 5B is arranged at an end of the lens film 8 provided on the front surface of the light guide plate 1 on the light guide plate 1 side. The low-voltage side wiring 5 is connected to the end of the lens film 8 on the liquid crystal plate side.
B may be arranged. Further, in the sixth embodiment, the low voltage side wiring of the light source is constituted by the wiring arranged so as to circulate along the end surface except the front end surface of the light guide plate.

Embodiment 2 As shown in FIG.
Conductive pattern formed of a transparent conductor on the front end surface 12 of the
In this manner, a low-voltage side wiring of the wiring section 5 is provided.

The current capacity can be increased by combining the conductive pattern disposed on the end face 12 of the light guide plate 1 with a transparent conductor and a mesh-shaped opaque conductor through which light passes.

[0018]

Since the present invention is configured as described above, it has the following effects.

Since the wiring portion of the light source is formed using an insulating wiring material in which the wiring portion is thin, it is not necessary to provide a space space for the wiring portion independently. Therefore, there is no need to particularly provide a wiring space for the light source, and as a result, it is possible to contribute to downsizing of the liquid crystal display device.

Further, by grounding the low-voltage side wiring 5B at one point as required, there is an effect that the safety can be improved and the noise mixing can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a liquid crystal display device according to Embodiment 1 of the present invention. (A) is the first embodiment, (b) is the second embodiment, (c) is the third embodiment, (d) is the fourth embodiment, and (e) is the fifth embodiment. Is shown.

FIG. 2 is a sectional view showing a liquid crystal display device according to Embodiment 2 of the present invention.

FIG. 3 is a diagram showing a conventional liquid crystal display device. (A)
Is a perspective view, and (b) is a sectional view.

[Explanation of symbols]

Reference Signs List 1 light guide plate, 11 front part, 11A illuminating surface, 1
2 front end, 13 side end, 14 back,
2 liquid crystal panel, 3 light source, 4 main reflector, 5 wiring section, 5A high voltage side wiring, 5B low voltage side wiring, 6
Circuit board, 7 Outer frame.

Claims (10)

[Claims] 1. A flat light guide plate having an illuminating surface for emitting light introduced from a front end portion to the outside from a front portion, and disposed on a front surface of the illuminating surface of the light guide plate and supplied through a circuit board. A liquid crystal plate that controls the transmission of light by an electric signal, a light source disposed in parallel with and close to the front end surface of the light guide plate, and a light source surrounding the light source at the front end of the light guide plate. A liquid crystal display device comprising: a main reflector; and a low-voltage side wiring of the light source, which is formed of a strip-shaped insulated wiring material. 2. A flat light guide plate having an illuminating surface for emitting light introduced from a front end face portion to the outside from the front portion, and disposed on the front surface of the illuminating surface of the light guide plate and supplied through a circuit board. A liquid crystal plate that controls the transmission of light by an electric signal, a light source disposed in parallel with and close to the front end surface of the light guide plate, and a light source surrounding the light source at the front end of the light guide plate. A liquid crystal display device comprising: a main reflector; and a low-voltage side wiring of the light source constituted by a conductive pattern. 3. The low voltage side wiring of the light source is disposed on a circuit board.
The liquid crystal display device as described in the above. 4. The liquid crystal display device according to claim 1, wherein the low voltage side wiring of the light source is disposed on a front surface of the light guide plate. 5. The liquid crystal display device according to claim 1, wherein the low-voltage side wiring of the light source is disposed on a back surface of the light guide plate. 6. The liquid crystal display device according to claim 1, wherein the low voltage side wiring of the light source is formed on the main reflector. 7. The liquid crystal display device according to claim 1, wherein the low-voltage side wiring of the light source is arranged along an end surface of the light guide plate except for a front end surface portion. 8. The liquid crystal display device according to claim 1, wherein the low voltage side wiring of the light source is disposed at an end of a lens film provided on a front surface of the light guide plate. 9. A flat light guide plate having an illuminating surface for emitting light introduced from the front end surface to the outside from the front portion, and disposed on the front surface of the illuminating surface of the light guide plate, and supplied through the circuit board. A liquid crystal plate that controls the transmission of light by an electric signal, a light source disposed in parallel with and close to the front end surface of the light guide plate, and a light source surrounding the light source at the front end of the light guide plate. A liquid crystal display device comprising: a main reflector; and a low-voltage side wiring of the light source, which is configured by a transparent conductive film disposed on a front end surface of a light guide plate. 10. The liquid crystal display device according to claim 9, wherein the transparent conductive film has a mesh-shaped conductor that transmits light.