JP4344113B2 - Lighting device for display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an illumination device for a display called a so-called backlight, and is particularly suitable for direct illumination of a relatively large liquid crystal display.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an illumination device for a display has one or more light sources such as cold cathode tubes arranged in a case, and light diffusing means is disposed in an opening. For example, as disclosed in JP-A-2002-23648, In order to prevent dropping and destruction and to reduce costs, a metal frame is arranged.
[0003]
[Problems to be solved by the invention]
However, as the display becomes larger and larger, the lighting device becomes larger. Since the illuminating device having a large size has a large opening for irradiating the display with light, the case tends to bend or twist due to its own weight or how it is supported. For this reason, the display (panel) could not be illuminated uniformly, or the external pressure was applied while it was bent and it was damaged, or dust entered from the generated gap to lower the display quality. Conventionally, even in the lighting device, the cost has been reduced by reducing the number of parts. However, as the display becomes larger, the individual parts of the lighting device become larger, and such large parts have higher dimensional accuracy. It has been found that it becomes difficult to manufacture the parts, the yield of the parts is deteriorated, it is difficult to assemble, or the cost is increased. Further, there has been a case where the dimensional error between the lighting device and the display becomes significant and the display cannot be supported.
[0004]
[Means for Solving the Problems]
The present invention has been made in consideration of the above-described points, and includes a light source disposed immediately below the display, a case having an opening for irradiating the display with the light from the light source, and a support for the light source. A diffuser provided in the opening, and a transparent plate having a thickness that is transparent and thick so as to oppose the display, and the reinforcing plate is provided on a side surface of the case. A chassis having means for fixing to the case is provided at least every four sides of the case .
[0005]
In the present invention, the guide portion of the display is slidably provided in the peripheral portion of the opening .
[0006]
Furthermore, according to the present invention, the guide portion of the display is slidably provided on the chassis .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 is a top and bottom sectional view of the 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 back, FIG. Is an enlarged view of the main part of the guide portion of the display, and FIG. 7 is a cross-sectional view taken along the lines AA and BB of FIG. 6, both taking the direct type backlight of the liquid crystal large display device most suitable for the present invention as an example. is there.
[0008]
In these figures, reference numeral 1 denotes a case that has an opening for irradiating light (lamp) to a display (liquid crystal panel) L with a number of aligned light sources (lamps), and supports the light source 2 and has an upper and lower frame shape. It may be a shape in which the two are coupled 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. Although such a case 1 consists of a resin molded product, you may comprise it with 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, a light diffusing material kneaded sheet, or the like can be used as the diffusing means, and it is only necessary that the position of the light source 2 from the observation surface can diffuse light so that it cannot be confirmed as a place with strong light. In this embodiment, the back surface of the case 1 is open, but may be integrally formed with the back cover (bottom surface). Further, the case 1 may be composed of a plurality of parts, for example, the crosspiece or frame that holds the light source of the case 1 and the holding part of the diffusing means 3 may be configured as separate parts.
[0009]
In the opening of the case 1, a translucent and thick reinforcing plate 5 is provided inside the diffusing means 3 so as to face the display device 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. Since such a reinforcing plate 5 is arranged to face the display device L, it is possible to protect the display device L from an external load and to suppress screen flickering due to vibration or impact.
[0010]
Reference numerals 41, 42, 43, and 44 are chassis provided on opposite side surfaces of the case 1 and are formed of metal molded products. 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 so that there is no rattling. The fixing means is preferably a tongue piece having elasticity at the base, but it may be one that sandwiches the reinforcing plate 5. Further, fixing means may be provided on the left and right chassis 41 and 43. By adopting such a configuration, the reinforcing plate and the chassis make the lighting device robust, and the occurrence of distortion and deflection of the liquid crystal display device can be reduced. 45 and 46 are rear chassis, and 6 is a back cover. More preferably, reflective films 61 and 62 are provided between the inner surface of the back cover 6 or the side surface of the case 1 and the back cover 6. As described above, the chassis is divided into a plurality of, more preferably, each crosspiece, so that the dimensional accuracy of each part can be increased and the cost can be reduced even in consideration of the assembly man-hours.
[0011]
Reference numeral 7 is a guide portion of the display L provided in the peripheral portion of the opening of the case 1 and can be slid by making a through hole for fixing with a screw substantially elliptical or flattening the screw to be stopped. Even if there is a dimensional variation of the display L, it can be securely fixed with a large clearance. In addition, as such a guide part 7, an upper guide part may be comprised with an elastic body, and you may make it press-fix the indicator L, for example.
[0012]
【The invention's effect】
As described above, in the present invention, a transparent and thick reinforcing plate is provided in the opening and is fixed by the chassis, so that the reinforcing plate does not rattle, the lighting device is robust, and is aligned with the display. Good sex. In addition, by configuring with a plurality of chassis, the unit cost of each component is reduced, and the dimensional accuracy is increased, so that the cost is high and robust. Further, since the guide portion of the display device is slidably provided in the peripheral portion of the opening portion, it can be firmly supported even if the glass substrate size of the display device varies.
[Brief description of the 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 the lighting device according to the embodiment of the present invention.
FIG. 3 is a right side view of the illumination 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 components of FIG. 4;
FIG. 6 is an enlarged view of a main part of a guide portion of a display device in the illumination device according to the embodiment of the present invention.
7 is a cross-sectional view taken along lines AA and BB in FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 2 Light source 3 Diffusion means 41, 42, 43, 44, 45, 46 Chassis 5 Reinforcement board 6 Back cover 7 Guide part

Claims (3)

A light source arranged directly under the display,
A case having an opening for irradiating the light of the light source to the display, and supporting the light source;
Diffusing means provided in the opening,
The opening is further provided with a translucent and thick reinforcing plate so as to face the display,
A display illumination device, wherein a chassis having means for fixing the reinforcing plate to the case is provided on a side surface of the case at least every four sides of the case .   The display illumination device according to claim 1, wherein a guide portion of the display is slidably provided in a peripheral portion of the opening.   The display illumination device according to claim 1, wherein a guide portion of the display is slidably provided on the chassis.

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