JPH09133921A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mounting workability and exchange workability of a linear light source by mounting a light source section to a main body section from outside this main body section in order to facilitate the attachment and detachment of this linear light source. SOLUTION: The main body section is constituted by housing and arranging a liquid crystal cell 4, a light transmission body 3, a circuit board 2, etc., between a base plate 1 and a frame 5. The light transmission body 3 is so constituted that its one flank faces the outside of the main body section. A lamp house 10 is composed of an upper lamp house 11 and a lower lamp house 12. The end edge on the side opposite to a hinge part 15 is opened by a hinge part 15 and the linear light source 7, a reflection sheet 6 and a light source fixture 8 are arranged in the inside. Machine screws 16 are passed into the holes formed respectively in the other end edges of the upper lamp house and the reflection sheet 6, the one-side end edges of the light transmission body 3, the circuit board 2 and the reflection sheet 6 and the lower lamp house 12, and nuts 17 are tightened, by which this device is completed. Then, the light source section is mountable after the main body section is assembled. The lamp house 10 is removable without the need for disassembling the main body section.

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 equipped with a lighting device.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal display device is provided with an illuminating device behind a liquid crystal cell. This illuminator used a fluorescent lamp covered with a reflecting mirror, but was thicker to uniformly illuminate a wide display surface. Therefore, as in Japanese Patent Laid-Open No. 64-78283, a device has been proposed in which a light guide is used and a light source is provided on the side surface thereof to reduce the thickness.

[0003]

In this device, however, since the liquid crystal cell, the light guide and the light source are arranged in a frame and integrated, a light source that is frequently replaced due to a failure or a lifetime is used. There was a problem that it was difficult to remove. In view of this point, the present invention provides a structure in which a light source can be easily attached and detached in a liquid crystal display device that illuminates using a light guide.

[0004]

A liquid crystal display device of the present invention comprises a liquid crystal cell, a light guide arranged on the back surface of the liquid crystal cell, a linear light source arranged on the side surface of the light guide, and the linear light source. In a liquid crystal display device including a lamp house that houses therein, the liquid crystal cell and the light guide body are arranged between a base and a frame to form a main body portion, and the linear light source is provided in the lamp house. It is characterized in that the light source section is arranged to constitute the light source section, and the light source section is attached to the main body section from outside the main body section in order to facilitate the attachment and detachment of the linear light source.

In the liquid crystal display device of the present invention, a liquid crystal cell, a light guide arranged on the back surface of the liquid crystal cell, and a circuit board are arranged and fixed between the base and the frame, and the side surface of the light guide is fixed. The linear light source is provided as a light guide for facilitating the attachment and detachment of the linear light source, which includes a main body portion exposed to the outside and a lamp house which is internally provided with the linear light source and independent of the main body portion. The lamp house is attached to the main body in a state of being faced to the side surface. Preferably, the lamp house is detachably attached to the main body.

With the above structure, the light source can be mounted after the liquid crystal cell, the light guide, the circuit board, etc. are arranged and fixed between the base and the frame to assemble the main body, and the linear light source can be mounted. Workability can be improved. In addition, when the main body is disassembled when replacing the linear light source, dust and the like are likely to be generated between the liquid crystal cell and the light guide, which is likely to cause a deterioration in display quality. Since the independent lamp house is mounted, the lamp house can be removed without disassembling the main body, and it is possible to effectively prevent the deterioration of display quality due to the adhesion of dust or the like.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an essential part of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. The liquid crystal display device of the embodiment is mainly composed of a main body portion and a light source portion.

First, the main body will be described. In the drawing, reference numeral 1 denotes a base made of an iron plate having a rising portion and a mounting surface in the periphery. Reference numeral 2 denotes a circuit board made of glass epoxy or paper phenol, on which an active element (not shown) is disposed. Reference numeral 3 denotes a substantially rectangular parallelepiped light guide made of acrylic resin. Reference numeral 4 denotes a liquid crystal cell including a field effect type liquid crystal panel and polarizers arranged above and below the panel. Reference numeral 5 denotes a holding frame made of an iron plate having an opening near the center, and has fixing claws on two opposing sides.

A hole is formed in the base 1 and the circuit board 2 at a position facing the claw of the holding frame body 5.
A circuit board 2, a light guide 3, and a liquid crystal cell 4 are sequentially placed on a base 1.
After the holding frame 5 is placed and the claws of the holding frame 5 are inserted into the holes of the circuit board 2 and the base 1, the components are fixed by twisting. By doing so, a main body is formed between the base 1 and the frame 5 in which the liquid crystal cell 4, the light guide 3, the circuit board 2 and the like are housed and fixed. Here, the main body is configured such that one side surface of the light guide 3 faces the outside of the main body.

Next, the light source portion mounted on the main body portion from the outside will be described. In the drawing, reference numeral 6 denotes a reflection sheet made of a polyester film or polycarbonate provided with a metal deposition film or a mirror-finished aluminum foil. The reflection sheet 6 is provided as needed to reflect the light source. In a case where the same function is achieved by another configuration, for example, a configuration in which the reflection sheet is not provided as in the related art is known. You can also. Reference numeral 7 denotes a linear light source formed of a rod-shaped fluorescent lamp, and has a light source fixture 8 formed of a substantially rectangular parallelepiped insulator at both ends thereof.
A lead wire set 9 composed of a lead wire and a connector is connected to the light source fixture 8.

Reference numeral 10 denotes a lamp house which is independent of the above-mentioned main body part, and is composed of an upper lamp house 11 and a lower lamp house 12 both made of an iron plate. The upper ramp house 11 has a rising portion, and the rising portion has a stepped bent portion and three notched upper hinge portions 13. Similarly, the lower lamp house 12 also has a rising portion, a stepped bent portion, and three notched lower hinge portions 14 in the cutout portion. A lamp house (10) having a hinge (15) is constructed by engaging the upper hinge (13) and the lower hinge (14). This hinge part 15
Thus, the linear light source 7, the reflection sheet 6 and the light source fixture 8 can be arranged inside the lamp house 10 by opening the edge of the lamp house 10 opposite the hinge portion 15. When the reflecting sheet 6 is not provided, the lamp house 10 also functions as a reflecting member of the light source 6, although it is somewhat.

The upper lamp house 11 and the reflection sheet 6
The other end edge, the light guide 3, the circuit board 2, one end edge of the reflection sheet 6 and the lower lamp house 12 are screwed into the holes provided in the lower lamp house 12 to fasten the nut 17 and fasten the device. Is completed.

With the above structure, one edge of the reflection sheet 6 is bonded to the edge of the back surface of the circuit board 2 or the edge of the back surface of the light guide 3, and the other edge of the reflection sheet 6 is attached. It is adhered to the edge of the surface of the light guide 3. Further, since the reflection sheet 6 has extensibility, the reflection sheet 6 is disposed so as to wrap the light source while maintaining a certain space between the reflection sheet 6 and the linear light source 7, so that the reflection efficiency is good.

Further, since the lamp house 10 has a hinge portion, the linear light source 7 and the reflection sheet 6 can be attached / detached by opening one end edge. The lamp house 10 accommodating the linear light source 7 is not integrated with the main body, that is, the holding frame 5, the liquid crystal cell 4, the light guide 3, and the base 1 on which the circuit board 2 is arranged. Therefore, the linear light source can be easily attached and detached.

The assembly procedure for mounting the light source section on the main body section and the procedure for replacing the linear light source 7 are as follows.
Although the description is simplified as matters that can be easily understood by those skilled in the art based on the description of the above-described embodiment, supplementary explanations will be given below with additional matters obvious to those skilled in the art for reference.

First, a supplementary description will be given of the assembling procedure when the light source unit is attached to the main body. First, an adhesive is applied to one edge of the reflection sheet 6 and fixed to the edge of the back surface of the circuit board 2. Alternatively, before fixing the light guide 3 described above,
The reflection sheet 6 having one edge coated with an adhesive is connected to the light guide 3.
May be fixed to the edge of the back surface of. Next, after enclosing the linear light source 7 inside the reflection sheet 6, the reflection sheet 6 having the other edge coated with an adhesive is fixed to the edge of the surface of the light guide 3. Subsequently, the edge of the lamp house 10 opposite to the hinge portion 15 is opened, the light source fixtures 8 at both ends of the linear light source 7 are positioned and arranged on the lower lamp house 12, and the lamp house 10 is closed. The linear light source 7 and the reflection sheet 6 are housed inside the house 10. Then, a small hole is provided in each of the upper lamp house 11, the other edge of the reflection sheet 6, the light guide 3, the circuit board 2, one edge of the reflection sheet 6, and the lower lamp house 12. The liquid crystal display device is completed by mounting the light source unit on the main body by fastening the nut 17 through the screw 16. As described above, since the light source unit can be mounted from outside the main body after the main body is assembled, the workability of assembling the liquid crystal display device can be improved.

When the light source 7 is turned on, a part of the light of the light source 7 is directly incident on the side surface of the light guide 3, and the other part of the light of the light source 7 is reflected by the reflection sheet 6 and then guided. Body 3
Incident indirectly on the side surface of.

When the reflection sheet 6 is not provided as well known in the prior art, the edge of the lamp house 10 opposite to the hinge portion 15 is opened, and the light source fixtures 8 at both ends of the linear light source 7 are attached to the lower lamp. The linear light source 7 is arranged and fixed inside the lamp house 10 by positioning it on the house 12 and closing the lamp house 10. Subsequently, a small screw 16 is passed through the holes provided in the upper lamp house 11, the light guide 3, the circuit board 2, and the lower lamp house 12, and a nut 17 is fastened.
The light source unit is attached to the main body to complete the liquid crystal display device. Also in this case, since the light source unit can be mounted after the main body unit is assembled, the workability of assembling the liquid crystal display device can be improved. Further, a part of the light of the light source 7 is directly incident on the side surface of the light guide 3, and the other part of the light of the light source 7 is a lamp house.
After being reflected by 10, the light is indirectly incident on the side surface of the light guide 3.

Next, a supplementary explanation will be given on the case of replacing the linear light source 7. First, loosen the nut 17 and remove the small screw 16
Remove. Next, the edge of the lamp house 10 opposite to the hinge portion 15 is opened to expose the other end of the reflective sheet 6, and the adhesive with the surface of the light guide 3 is removed to remove the other end of the reflective sheet 6. The surface of the light guide 3 is peeled off. Here, the reflection sheet 6
Since the adhesion between the light guide 3 and the light guide 3 may be set to such a weakness that temporary fixing is performed, the reflection sheet 6 can be easily peeled off. That is, since the adhesive portion between the reflection sheet 6 and the light guide 3 is fixed by fastening the small screw 16 and the nut 17 through the lamp house 10, there is almost no need to firmly attach the sheet. Next, the linear light source 7 is replaced with the other end of the reflection sheet 6 separated from the light guide 3. When the replacement is completed, the replacement work of the linear light source is completed by assembling in the same procedure as in the case of assembling. Here, when the linear light source is replaced, it is not necessary to disassemble the main body, so that it is possible to avoid a decrease in display quality caused by dust and the like attached to the disassembly of the main body. Since the main body does not need to be disassembled, light source replacement workability can be improved as compared with the case where the main body needs to be disassembled.

When the linear light source 7 is replaced without the reflection sheet 6, the nut 17 is loosened, the small screw 16 is removed, and the end of the lamp house 10 opposite to the hinge 15 is opened. The lamp house 10 is removed from the side surface of the light guide 3. next,
The linear light source 7 is replaced. When the replacement is completed, the replacement work of the linear light source is completed by assembling in the same procedure as in the case of assembling. Also in this case, since it is not necessary to disassemble the main body when replacing the linear light source, it is possible to avoid deterioration of display quality caused by dust or the like attached to the main body when disassembling it. Since the main body does not need to be disassembled, the light source replacement workability can be improved as compared with the case where the main body is disassembled.

[0021]

As described above, according to the present invention, the liquid crystal cell, the light guide arranged on the back surface of the liquid crystal cell, the linear light source arranged on the side surface of the light guide, and the linear light source inside In a liquid crystal display device including a lamp house to be housed in, the liquid crystal cell and the light guide body are arranged between a base and a frame to form a main body, and the linear light source is arranged in the lamp house. The light source unit is attached to the main body unit from outside the main body unit in order to easily attach and detach the linear light source, and thus the light source unit can be attached after the main body unit is assembled. Therefore, the workability of mounting the linear light source can be improved. In addition, if the main body is disassembled when the linear light source is replaced, dust and the like are likely to be adhered between the liquid crystal cell and the light guide, which is likely to cause a reduction in display quality. The light source unit can be removed without disassembling the main unit because it is attached to the main unit from the outside of the main unit, improving the workability of replacing the linear light source and improving the display quality due to dust adhesion. The deterioration can be effectively prevented, and the display quality can be maintained in a good state.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the embodiment.

[Explanation of symbols]

 1 Base 2 Circuit Board 3 Light Guide 4 Liquid Crystal Cell 5 Holding Frame 6 Reflective Sheet 7 Linear Light Source 10 Lamp House 15 Hinge

Front Page Continuation (72) Inventor Norio Otari Sanyo Electric Co., Ltd. 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture

Claims (3)

[Claims] 1. A liquid crystal display device comprising a liquid crystal cell, a light guide arranged on the back surface of the liquid crystal cell, a linear light source arranged on a side surface of the light guide, and a lamp house containing the linear light source therein. In the above, the liquid crystal cell and the light guide body are arranged between a base and a frame to form a main body portion, and the linear light source is arranged in the lamp house to form a light source portion. A liquid crystal display device, wherein the light source unit is attached to the main body unit from outside the main body unit in order to easily attach and detach the light source. 2. A main body in which a liquid crystal cell, a light guide arranged on the back surface of the liquid crystal cell, and a circuit board are arranged and fixed between a base and a frame, and a side surface of the light guide is exposed to the outside. Department,
In a state where the linear light source is provided inside and a lamp house independent of the main body is provided, and in order to facilitate the attachment and detachment of the linear light source, the linear light source is faced to the side surface of the light guide body. A liquid crystal display device, wherein the lamp house is attached to the main body. 3. The liquid crystal display device according to claim 1, wherein the lamp house is detachably attached to the main body.