Back light unit mold frame construction

Abstract

A mold frame contains a lamp shade and a light source, a light guide being erected at the open end and secured in place on one side of the lamp shade; streams of light from the light source entering into from one side of the light guide plate to project in the direction as expected; and a mask device being disposed on the mold frame at where close to the joint edge of the light guide plate so to weaken the reflection rate of the light that leaves the light guide plate, to reduce the interference of the light in the light guide plate, and to diminish the phenomenon of ripples.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a construction of a mold frame in an edge-lighting back light unit of the prior art.

FIG. 2 is a schematic view showing a construction of a back light unit assembled in a mold frame of the prior art.

FIG. 3 is a schematic view showing a construction of a back light unit assembled in a mold frame of the present invention.

FIG. 4 is a perspective view showing a construction of the mold frame and a mask device of the present invention.

FIG. 5 is another perspective view showing a construction of the mold frame and a mask device of the present invention.

Claims

1. A back light unit mold frame comprising: a lampshade; a mold frame; and a light source; a light guide plate being inserted onto an open end of the lampshade and secured on one side of the lampshade; streams of light emitted from the light source entering from one side of the light guide plate; the streams of light from the light source projecting in an expected direction; a mask device having a first surface engaging the mold frame and a second surface engaging the light edge plate and the one side of the lampshade to weaken the reflection rate of the light that leaves the light guide plate, to reduce the interference of the light in the light guide plate, and to diminish a phenomenon of ripples.

2. The back light unit mold frame as claimed in claim 1, wherein the mask device is made of a black light absorption material.

3. The back light unit mold frame as claimed in claim 1, wherein the mask device is applied onto the mold frame.

4. The back light unit mold frame as claimed in claim 1, wherein the mask device is an adhesive tape attached to the mold frame.

5. The back light unit mold frame as claimed in claim 4, wherein the adhesive tape has various colors.

6. The back light unit mold frame as claimed in claim 1, wherein a reflection film is disposed below the light guide plate.