JP2003288802A - Lighting device for display unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device for a display unit, robust and easy to hit the display unit on. <P>SOLUTION: A case 1 supporting a light source 2 having an opening for irradiating light of the light source on the display unit L and a diffusion means 3 fitted at the opening are provided. A thick reinforcing plate 5 with translucency is further fitted at the opening of the case 1 so as to oppose the display unit. Chassis 41 to 46 with a fixing means for the reinforcing plate are fitted at a side face of the case 1. The chassis are composed of a plurality of bars. A guide part 7 of the display unit is fitted at a periphery part of the opening in free sliding. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called backlight illuminating device for a display, and is particularly suitable for direct illumination of a relatively large liquid crystal display.

[0002]

2. Description of the Related Art Conventionally, in a lighting device for a display, one or more light sources such as cold cathode tubes are arranged in a case and housed in a case, and a light diffusing means is arranged in an opening.
As disclosed in Japanese Patent No. 3648, a metal frame is arranged to prevent dropping and destruction and cost reduction.

[0003]

However, as the display becomes larger and the area becomes larger, the illuminating device also becomes larger. Since the large-sized lighting device has a large opening for irradiating the display with light, the case is likely to be bent or twisted due to its own weight or a supporting method. For this reason, the display (panel) cannot be uniformly illuminated, external pressure is applied to the display while it is bent, and dust is introduced from the generated gap to lower the display quality. In the past, even in lighting devices, cost reduction was achieved by reducing the number of parts, but as the display becomes larger, the individual parts of the lighting device also become larger, and such large parts have high dimensional accuracy. It has been found that it becomes difficult to manufacture the parts, the yield of the parts becomes poor, the assembling becomes difficult, or the cost becomes rather high. Further, a dimensional error between the illuminating device and the display becomes remarkable, and the display cannot be supported in some cases.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and a case for supporting a light source having an opening for irradiating light from the light source to a display, and a case provided in the opening. And a diffusing means that is provided, and a translucent and thick reinforcing plate is further provided in the opening so as to face the display,
A chassis having fixing means for the reinforcing plate is provided on the side surface of the case.

Further, according to the present invention, there are provided a case for supporting the light source so that the light from the light source is applied to the display, a diffusing means provided in the opening, and a plurality of chassis for supporting each side surface of the case. It is provided, and more preferably, the chassis is configured for each crosspiece on each side.

Further, according to the present invention, there is provided a case for supporting the light source having an opening for irradiating the display with the light of the light source, and a diffusing means provided in the opening, and a display is provided in the peripheral portion of the opening. The guide part of the container is slidably provided.

[0007]

1 is a vertical sectional view of a lighting device of the present invention, FIG. 2 is a left sectional view, FIG. 3 is a right side view, FIG. 4 is an exploded perspective view from the rear side, and FIG. 6 is a perspective view of the parts of FIG. 6, FIG. 6 is an enlarged view of a main part of the guide portion of the display, and FIG.
In each of the B-B sectional views, the present invention is most suitable for the direct type backlight of the large-sized liquid crystal display device as an example.

In these figures, reference numeral 1 denotes a case which has an opening for irradiating light from a large number of aligned light sources (lamps) to a display (liquid crystal panel) L, and which supports the light source 2. The shape may be a shape in which the shape-like elements are joined at a predetermined interval or a boat shape without a bottom. Further, it is preferable that the opening has a substantially rectangular shape with respect to the liquid crystal panel. The case 1 is made of a resin molded product, but may be made of a metal molded product. In the opening of the case 1, three lens sheets and one light diffusion sheet are laminated as the diffusion means 3. In addition to this, a milky white sheet or a light diffusing material kneading sheet can be used as the diffusing means.
It is enough that the position of can diffuse the light to the extent that it cannot be confirmed as a place with strong light. Although the back surface of the case 1 is open in this embodiment, it may be integrally formed with the back cover (bottom surface). Further, the case 1 may be a plurality of parts, such as a crosspiece or a frame for holding the light source of the case 1 and a holding part of the diffusing means 3 are configured as separate parts.

A translucent and thick reinforcing plate 5 is provided inside the diffusing means 3 in the opening of the case 1 so as to face the display L. The reinforcing plate 5 is made of a low reflection grade transparent acrylic resin plate or the like, and has a size and a shape that can be fitted into the opening. Such a reinforcing plate 5
Is disposed so as to face the display L, it is possible to protect the display L from an external load and suppress screen flicker due to vibration or shock.

Reference numerals 41, 42, 43 and 44 denote chassis provided on the opposite side surfaces of the case 1, which are made of metal moldings. The upper and lower chassis 42 and 44 have folding step portions as fixing means for the reinforcing plate 5. The reinforcing plate 5 is pressed against the case 1 without rattling. The fixing means is preferably a tongue piece having elasticity at the root, but may be a shape in which the reinforcing plate 5 is sandwiched. In addition, the fixing means is used for the left and right chassis 41, 4
3 may be provided. With such a structure, the reinforcing plate and the chassis can make the lighting device robust and reduce distortion and bending of the liquid crystal display device. Also 45,
Reference numeral 46 is a rear chassis, and 6 is a back cover. The reflective films 61, 6 are provided between the inner surface of the back cover 6 and the side surface of the case 1 and the back cover 6.
It is more preferable to provide 2. As described above, by constructing a plurality of chassis, more preferably by dividing each chassis, it is possible to improve the dimensional accuracy of each component and reduce the cost even in consideration of the number of assembling steps.

Reference numeral 7 is a guide portion of the display L provided in the peripheral portion of the opening of the case 1, and the through hole for stopping with a screw is formed into a substantially elliptical shape, or the stopping screw is flattened. Since it is slidable, the display L can be securely fixed with a large clearance even if the dimensions of the display L vary. As such a guide unit 7, for example, the upper guide unit may be made of an elastic body to press and fix the display L.

[0012]

As described above, according to the present invention, since the light-transmissive and thick reinforcing plate is provided in the opening and is fixed by the chassis, the reinforcing plate does not rattle and the lighting device becomes robust. Also, it has good compatibility with the display. Further, by using a plurality of chassis, the unit price of each component is lowered and the dimensional accuracy is increased, so that the cost is good and the structure is robust. Further, since the guide portion of the display is slidably provided in the peripheral portion of the opening, even if the size of the glass substrate of the display device is varied, it can be firmly supported.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a lighting device according to an embodiment of the present invention.

FIG. 2 is a left sectional view of an illumination device according to an embodiment of the present invention.

FIG. 3 is a right side view of the lighting device according to the embodiment of the present invention.

FIG. 4 is an exploded perspective view from the back of the lighting device according to the embodiment of the present invention.

FIG. 5 is a perspective view of the parts of FIG.

FIG. 6 is an enlarged view of a main part of a guide portion of a display device in the lighting device according to the embodiment of the present invention.

7 is a sectional view taken along line AA and BB in FIG.

[Explanation of symbols]

1 case 2 light sources 3 diffusion means 41, 42, 43, 44, 45, 46 chassis 5 Reinforcement plate 6 case back 7 Guide section

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuichi Tsubaki             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. (72) Inventor Keiichi Kishida             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. (72) Inventor Toshio Hashino             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. F term (reference) 2H091 FA23Z FA31Z FD06 FD11                       LA02

Claims (3)

[Claims] 1. A case having an opening for irradiating light from a light source to a display and supporting the light source, and a diffusing means provided in the opening, the opening further facing the display. As described above, a translucent and thick reinforcing plate is provided, and a chassis having fixing means for fixing the reinforcing plate is provided on the side surface of the case. 2. A case comprising a case for supporting the light source so as to irradiate the display with the light from the light source, a diffusing means provided in the opening, and a plurality of chassis for supporting each side surface of the case. A lighting device for a display, characterized in that 3. A display has a case for supporting the light source, the case having an opening for irradiating the display with light from the light source, and a diffusing means provided in the opening. An illumination device for a display, wherein a guide part is provided slidably.