BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of a structure of a backlight module of the prior art.
FIG. 2 is a schematic view of a structure of a backlight module of the present invention.
FIGS. 3(A) and 3(B) are perspective views of the backlight module of the present invention.
FIG. 4 is a schematic view showing a traveling route of stream of light emitted from the backlight module of the present invention.
FIG. 5 is a perspective view showing a structure of multiple diffusion films of the present invention before being molded.
FIG. 6 is a perspective view showing a structure of multiple diffusion films of the present invention that are molded.
FIG. 7 is a schematic view showing another structure of the backlight module of the present invention
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 2, an improved structure of a backlight module of the present invention has multiple light sources 22 disposed in a reflection mask 21; a diffuser 23 disposed over the top of those light sources and multiple optical films 24 over the diffusion plate 23; and a liquid crystal panel 25 over those optical films 24. Wherein, each light source is related to a tube in a form of straight, U-shaped, or any other form with continuous curves, or a light emitting diode with all light sources 22 arranged with a proper spacing between the reflection mask 21 and the diffuser 23; and those multiple optical films 24 disposed between the diffuser plate 23 and the liquid crystal panel 25 are comprised of one up to three diffusion films, none or one or two light enforcement films, and none or one reflective type of polarized light film.
The present invention is characterized in that multiple diffusion films 26 arranged in a spacing same as that for those light sources 22 over those light sources 22 as also illustrated in FIGS. 3(A) and 3(B). Each diffusion film 26 is secured in position to the reflection mask 21 by means of a locating device 27, which may be related to an adhesive tape, adhesion, or any other locating means so to secure each diffusion film 26 to where above its respective light source 22.
In practice, luminance of those streams of light emitted from and above those light sources 22 as illustrated in FIG. 4 are reduced due to diffusion effects provided by those diffusion films 26 while the luminance of the streams of light emitted from those light sources 22 through gap between any two abutted light sources 22 becomes equivalent to that of the streams of light emitted through those diffusion films 26 over those light sources 22 thus to correct the darker and bright bands produced in the backlight module.
Furthermore, a entire sheet of diffusion film 26′ is pre-fixed to where above those light sources 12 as illustrated in FIG. 5. Wherein, the diffusion film 26′ covers over the top of those light sources 22; and then each spacing between the diffusion film 26′ and each light source 22 is removed to become a structure as illustrated in FIG. 6 wherein those diffusion films 26 arranged with the same spacing as that for those multiple light sources 22 are provided over each light source 22.
Alternatively, each diffusion film 26 may be secured by means of the locating device (e.g., adhesive tape or adhesion not illustrated) to where below the diffusion plate 23 relatively to the top over each light source 22 as illustrated in FIG. 7 to achieve the same purpose of reducing the luminance of stream of light and correcting the phenomenon of darker and brighter bands in the backlight module.
The prevent invention provides an improved structure of a backlight module, and the application for a utility patent is duly filed accordingly. However, it is to be noted that the preferred embodiments disclosed in the specification and the accompanying drawings are not limiting the present invention; and that any construction, installation, or characteristics that is same or similar to that of the present invention should fall within the scope of the purposes and claims of the present invention.
Patent Application
20080055930
