CN101498861A - Back light module unit - Google Patents

Abstract

A backlight module, comprising a frame and an ultraviolet light source accommodated in the frame, a fluorescent diffusion sheet, a lower layer of brightness enhancement sheet and an upper layer of brightness enhancement sheet, the frame includes a bottom surface and a side surface, the bottom surface and There is a fluorescent layer on the inner surface of the side. The fluorescent layer can excite the ultraviolet light emitted from the ultraviolet light source to emit visible light for use by the backlight module. The backlight module omits the use of the bottom fluorescent sheet in the current backlight module, and has low material cost and simple structure.

Description

Backlight module

technical field

The invention relates to a backlight module, in particular to a backlight module of a liquid crystal display.

Background technique

At present, various types of liquid crystal displays mainly adopt a combined structure of a panel and a backlight module. The backlight module mainly provides a surface light source with uniform brightness, and the panel modulates the light to realize the display function.

There are mainly two types of backlight modules: direct-type and side-type. In the current direct-type backlight modules that use ultraviolet light sources, a fluorescent sheet is generally installed under the ultraviolet light source. The fluorescent sheet emits different wavelengths from the ultraviolet light source. The light is excited to emit visible light for use by the backlight module. In this design solution of the backlight module, the existence of the fluorescent sheet makes the thickness of the backlight module relatively thick, and the cost is relatively high.

Contents of the invention

In view of the above, it is necessary to provide a cost-reduced backlight module.

A backlight module, comprising a frame and an ultraviolet light source accommodated in the frame, a fluorescent diffusion sheet, a lower layer of brightness enhancement sheet and an upper layer of brightness enhancement sheet, the frame includes a bottom surface and a side surface, the bottom surface and There is a fluorescent layer on the inner surface of the side.

The fluorescent layer can excite the ultraviolet light emitted from the ultraviolet light source to emit visible light for use by the backlight module. The backlight module omits the use of the bottom fluorescent sheet in the current backlight module, has a simple structure and reduces the material cost of the backlight module.

Description of drawings

Below in conjunction with accompanying drawing and preferred embodiment the present invention is described in further detail:

FIG. 1 is a schematic diagram of a preferred embodiment of the backlight module of the present invention.

Detailed ways

Please refer to Fig. 1, the preferred embodiment of the backlight module of the present invention comprises a frame 500, a plurality of ultraviolet light sources 100, a fluorescent diffusion sheet 200, and a lower layer of brightness enhancement sheet 300 and an upper layer arranged on the fluorescent diffusion sheet 200 in sequence Enhancement sheet 400.

The ultraviolet light source 100 is a point light source or a line light source. The frame 500 accommodates the ultraviolet light source 100 , the fluorescent diffusion sheet 200 , the lower brightness enhancement sheet 300 and the upper brightness enhancement sheet 400 therein. The frame 500 includes a bottom surface 510 , a side surface 520 , and the fluorescent layer 511 and the fluorescent layer 521 disposed on inner surfaces of the bottom surface 510 and the side surface 520 .

The bottom surface 510 and the side surface 520 of the frame 500 are made of engineering plastics or metal materials, the angle range between the bottom surface 510 and the side surface 520 is greater than 90 degrees and less than 180 degrees, and the bottom surface 510 and the side surface 520 are separated structure or unitary structure. The fluorescent layer 511 and the fluorescent layer 521 adopt fluorescent materials, and the fluorescent materials can be coated or deposited on the bottom surface 510 and the side surfaces 520. Excited to emit visible light for use by the backlight module. The frame 500 can play a reflective role, and can be used to reflect part of the light that does not enter the fluorescent diffusion sheet 200 into the fluorescent diffusion sheet 200 for full use.

The fluorescent diffusion sheet 200 converts the ultraviolet light emitted by the ultraviolet light source 100 into a uniform surface light source, which is excited by the fluorescent layer 511 and the fluorescent layer 521 and emits visible light. The lower brightness enhancement sheet 300 and the upper brightness enhancement sheet 400 are used to increase the brightness of the surface light source.

In this preferred embodiment, the frame 500 has the function of the fluorescent sheet in the current backlight module, and can also play the role of reflecting light, so the backlight module with the frame 500 can save the current backlight module. With the use of the fluorescent sheet at the bottom, the frame 500 can also reflect part of the light that does not enter the fluorescent diffusion sheet 200 into the fluorescent diffusion sheet 200 for full use, improving the light utilization rate of the ultraviolet light source 100 . The backlight module has a simple structure, low material cost, and is lighter and thinner than the commonly used backlight modules at present.

Claims (5)

1. [claim 1] a kind of module backlight, comprise a framework and be contained in described framework interior a ultraviolet source, a fluorescence diffusion sheet, lower floor's brightening piece and a upper strata brightening piece, it is characterized in that: described framework comprises a bottom surface and a side, and the inside surface of described bottom surface and side has a fluorescence coating.
2. [claim 2] module backlight as claimed in claim 1 is characterized in that: the material of described bottom surface and side is engineering plastics or metal material.
3. [claim 3] module backlight as claimed in claim 1 is characterized in that: described fluorescence coating is coated with or is deposited on the bottom surface and side of described framework.
4. [claim 4] module backlight as claimed in claim 1 is characterized in that: the angular range between described bottom surface and the side is for spending greater than 90 degree and less than 180.
5. [claim 5] module backlight as claimed in claim 1 is characterized in that: described bottom surface and side are for dividing body structure or integrative-structure.