(1) Field of the Invention
The present invention relates to a backlight module in a flat panel display(FPD), and more particularly relates to the disposal of optical films in the backlight module.
(2) Description of the Prior Art
The crystal display technology is a passive display technology. It must have a backlight source to provide light for the panel to display image. Generally, to enhance the brightness and uniformity of the image, the light from the backlight source is capable of having both enough luminance and uniformity.
However, the optical film 100 needs the lower diffusion film 140, the BEF 160 and the upper diffusion film 180 altogether to provide uniform backlight, which causes the fabrication cost of the backlight module hard to decrease. Thus, how to reduce the number of optical films while reaching the same luminous effect is an urgent problem in this technology field.
An embodiment of the present invention is to reduce the number of optical films used in a backlight module of a flat display to decrease the fabrication cost of the backlight module.
The backlight module in the embodiment of the present invention is disposed under a display panel and close to a polarizer on a lower surface of the display panel. The backlight module includes an illumination module and an optical film which disposed above the illumination module. The optical film has a lower layer and an upper layer attached to the lower layer. The upper layer is close to the polarizer and has a plurality of first micro-protrusion structures formed on an upper surface. The lower layer has a plurality of second micro-protrusion structures with different heights formed on an upper surface. The higher second micro-protrusion structures support the upper layer, so as to form a gap with various dimensions between the upper layer and the lower layer.
A fabrication method of the backlight module in the embodiment of the present invention provides an illumination module, an upper layer and a lower layer. The upper layer has a plurality of first micro-protrusion structures formed on an upper surface thereof, and has a smooth lower surface. The lower layer has a plurality of second micro-protrusion structures with various heights formed on the upper surface thereof. The lower layer is attached to the upper layer to form an optical film, and to form a gap with various dimensions between the upper layer and the lower layer. The optical film is disposed above the illumination module.
The conventional optical film needs the lower diffusion film, the BEF and the upper diffusion film altogether to provide uniform backlight, which causes the fabrication cost of the backlight module hard to decrease. Compared to the conventional optical film, it has now been found that the backlight module in the embodiment of the present invention needs only one optical film to provide uniform backlight with enough luminance. In this regard, it may reduce the fabrication cost of the backlight module effectively.
Other objectives, features and advantages of the present invention will be further understood from the further technological features disclosed by the embodiments of the present invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention.
The present invention will now be specified with reference to its preferred embodiment illustrated in the drawings, in which
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” etc., is used with reference to the orientation of the Figure(s) being described. The components of the present invention may be positioned in a number of various orientations. As such, the directional terminology is used for purposes of illustration and is in no way limiting. On the other hand, the drawings are only schematic and the sizes of components may be exaggerated for clarity. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,” “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. Similarly, the terms “facing,” “faces” and variations thereof herein are used broadly and encompass direct and indirect facing, and “adjacent to” and variations thereof herein are used broadly and encompass directly and indirectly “adjacent to”. Therefore, the description of “A” component facing “B” component herein may contain the situations that “A” component directly faces “B” component directly or one or more additional components are between “A” component and “B” component. Also, the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components are between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
The backlight module 300 has an illumination module 390 and an optical film 360. The optical film 360 is disposed above the illumination module 390 and close to the polarizer 220 on the lower surface of the display panel 200. In this embodiment, the illumination module 390 has a light guide plate 320 and a light source 340 adjacent to the light guide plate 320. In addition, the optical film 360 is disposed above the light guide plate 320, and the light source 340 is disposed by side of the light guide plate 320. The light from the light source 340 enters the light guide plate 320 from a light entrance surface 322 located at the side of the light guide plate 320. However, the present invention is not so limited. Referring to the embodiment in
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The foregoing description of the preferred embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present invention as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.
Number | Date | Country | Kind |
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097105746 | Feb 2008 | TW | national |