Magnified backlight device made of a plurality of light guiding panel cells which are successively connected side by side with overlap

Abstract

The invention provides a magnified backlight device made of a plurality of light guiding panel cells which are successively connected side by side with overlap, and particularly a magnified light guiding panel backlight device used for an advertising board, wherein the plurality of light guiding panel cells are connected side by side. A panel group receiving-supporting frame part provides a receiving space, wherein the receiving space is sufficiently large so that the receiving space is adapted to thermal expansion coefficient differences of the light guiding panels after the light guiding panel cell assemblies are received, supports the front part and the back part and does not fix the light guiding panel assemblies so that the light guiding panel assemblies can move laterally, and prevents deformation caused by the thermal expansion coefficient difference between the frame and the light guiding panel cell assemblies. One or a plurality of optical dispersion tubes are fixed to and cover connecting parts of the light guiding panel cells to perform optical dispersion function and separation function, the optical dispersion function compensates low brightness of the connecting parts via refraction and dispersion of light from the connecting parts of the light guiding panels and the adjacent zones, and the separation function is used for preventing an advertising film installed on the light guiding panel cell assemblies from getting close to the light guiding panels due to loosening caused by tension loosening.

Description

technical field [0001] The present invention relates to a backlight device, and more particularly, to a technique for providing a light guide plate-based backlight device of a desired size without being limited by the size of an acrylic plate used as a material of the light guide plate. Background technique [0002] Backlight devices using light guide plates were originally used as backlights for small display devices such as televisions or computer monitors, but recently the use has spread to be widely used as backlights for indoor or outdoor bulletin boards or advertising boards (hereinafter referred to as advertising boards) . Indoor billboards are usually medium or small, while outdoor billboards are usually large or extra-large. The light guide plate is made of acrylic resin plate. However, the maximum size of the currently produced acrylic resin plate for the light guide plate is about 6 meters by 2 meters. Since it is difficult to manufacture an advertising board l...

AI Technical Summary

Problems solved by technology

However, with the above method, since the brightness difference between the connected portion and the remaining portion is serious, it is impossible to prevent the occurrence of a dark shadow area

Especially, since the conventional backlight device 200 has no means for maintaining the minimum distance between the light guide plate 440 and the advertisement film (not shown) placed on the light guide plate 440, if the advertisement film with reduced tension approaches the guide The surface of light board 440, such as Figure 4 As shown, there are the following problems: the area with heavy shadows is exposed outside the advertising film

Also, due to the heat generated when the lamp 420 emits light and the temperature difference between positions, the dispersing sheet 450 is easily deformed, which is a problem.

[0006] The above-mentioned conventional backlight device 200 cannot provide a means for helping a person who has no skill in installing advertising film to install it conveniently and easily and for properly adjusting the tension of the advertising film.

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