Backlight module

Abstract

A backlight module (10) includes a light source and a light guide plate (12). The light source defines a number of light units (11) for emitting light beams. The light guide plate includes a light incident surface (121), an emission surface (123) adjacent to the light incident surface, a bottom surface (124) opposite to the emission surface, a plurality of side surfaces (122) between the emission surface and the bottom surface, and a plurality of diffusion units (13) formed on the bottom surface. A dot size of each diffusion unit/dot is inversely proportional to a summation of the sum of reciprocals of squares of distances between the diffusion unit and each of the light units and the sum of reciprocals of squares of distances between the diffusion unit and corresponding images of each of the light units formed, respectively, by the side surfaces.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the present backlight module can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present backlight module. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a schematic, bottom elevation of a first embodiment of a backlight module, the backlight module including a line of point light sources and an LGP;

FIG. 2 is a schematic, side elevation of the backlight module of FIG. 1;

FIG. 3 is a schematic, bottom view of the light guide plate of FIG. 1, showing the LGP and the point light sources, located in a Cartesian coordinate system;

FIGS. 4 to 7 illustrate the relative sizes of diffusion dots on the LGP of FIG. 1 along different cross sections;

FIG. 8 is a schematic, bottom elevation of a second embodiment of a backlight module;

FIG. 9 is a schematic, side elevation view of a conventional backlight module; and

FIG. 10 is a schematic, bottom elevation view of the backlight module of FIG. 9.

Claims

1. A backlight module, comprising: a light source defining a plurality of light units configured for emitting light beams; anda light guide plate structured and arranged for transmitting the light beams, comprising: a light incident surface configured for receiving the light beams;an emission surface adjacent to the light incident surface, the emission surface being configured for emitting the light beams;a bottom surface opposite to the emission surface;a plurality of side surfaces connectively arranged between the emission surface and the bottom surface; anda plurality of diffusion units formed on the bottom surface, the diffusion units being structured and arranged for scattering the light beams;wherein a size of each diffusion unit is inversely proportional to a summation of a sum of reciprocals of squares of distances between the diffusion unit and each light unit and a sum of reciprocals of squares of distances between the diffusion unit and corresponding images of each light unit formed, respectively, by the side surfaces.

2. The backlight module as claimed in claim 1, wherein the light source comprises a plurality of point sources, each light unit being defined by a respective one of the point sources.

3. The backlight module as claimed in claim 2, wherein the point sources are light emitting diodes.

4. The backlight module as claimed in claim 2, wherein a dot size D of each diffusion unit is represented by the following equation:

5. The backlight module as claimed in claim 1, wherein the light source is a linear source, each of the light units is defined by a section of the linear source with a length of dl, a dot size D of each diffusion unit is represented by the following equation:

6. The backlight module as claimed in claim 1, wherein each diffusion unit is generally hemispherical or sub-hemispherical.

7. The backlight module as claimed in claim 1, wherein the diffusion units are convex protrusions.

8. The backlight module as claimed in claim 1, wherein the diffusion units are arranged in a generally uniform array on the bottom surface.

9. The backlight module as claimed in claim 1, further comprising a plurality of reflective elements respectively arranged adjacent the side surfaces of the light guide plate.

10. A backlight module, comprising: a light source defining a plurality of light units for directly emitting light beams; anda light guide plate for transmitting the light beams, comprising: a light incident surface for receiving the light beams;an emission surface adjacent to the light incident surface for emitting the light beams;a plurality of side reflection surfaces laterally facing the incident surface and reflecting the light beams in the light guide plate;a bottom surface opposite to the emission surface; anda plurality of diffusion regions formed on the bottom surface for scattering the light beams;wherein an area of each of said diffusion regions is inversely proportional to a summation of reciprocals of squares of distances between the diffusion regions and all light beams directly derived from any one of the light source and the side reflection surfaces.