CN101470299A - Light emitting diode backlight module, diffusion sheet thereof and manufacturing method thereof - Google Patents

Abstract

A light-emitting diode backlight module, a diffuser and a manufacturing method thereof, wherein the light-emitting diode backlight module comprises a light source, a light guide plate and a diffuser, wherein the diffuser comprises a phosphor material distributed inside or on the light-emitting surface of the diffuser, and a light-emitting diode is used to excite the phosphor material to generate white light. The manufacturing method of the diffuser comprises providing a transparent plastic, and adding phosphor to the transparent plastic to form a diffuser with phosphor.

Description

Light-emitting diode backlight module, its diffuser and its manufacturing method

technical field

The present invention relates to a light emitting diode backlight module, its diffusion sheet and its manufacturing method, and in particular to a light emitting diode backlight module with a fluorescent powder diffusion sheet and its manufacturing method.

Background technique

In the backlight module, the function of the diffusion sheet of the light guide layer is to provide a uniform surface light source for the liquid crystal display. The general diffusion sheet is to add a diffusing agent to the resin substrate to refract, reflect and scatter the light to form an optical Diffusion effect.

Since the luminance uniformity of the light guide layer must be controlled by the light source, and the chromaticity area of the current backlight module is getting smaller and smaller, LEDs are required to provide a narrow light source. However, compared with the backlight module using traditional cold-cathode lamps, although the LED backlight module panel has the advantages of ultra-thin, high luminance, and long life of the light source, white LEDs not only have high cost, low luminous efficiency, but also need Cathode tubes have a larger color mixing space to obtain a uniform surface light source.

Contents of the invention

Therefore, the object of the present invention is to provide an LED backlight module and a diffuser, which can generate white light with high concentration of chromaticity to improve the uniformity of the light emitted by the backlight module.

According to the present invention, a diffusion sheet applied to a light-emitting diode backlight module and a manufacturing method thereof are provided. During the manufacturing process of the diffusion sheet, fluorescent powder is added to transparent plastic to form a diffusion sheet with fluorescent powder. The light-emitting diode backlight module using the diffuser can use the light-emitting diode to excite phosphor materials to generate white light with high chromaticity concentration.

A diffusion sheet of a light-emitting diode backlight module disclosed by the present invention comprises a body with a light incident surface and a light exit surface; a diffusing agent uniformly distributed inside the body; and a fluorescent powder substance distributed inside the body .

A manufacturing method for forming a diffusion sheet of a light-emitting diode backlight module disclosed by the present invention includes providing a transparent plastic; adding a diffusing agent to the transparent plastic; adding a fluorescent powder to the transparent plastic; and curing the transparent plastic to form A diffuser sheet containing phosphor.

A light-emitting diode backlight module disclosed by the present invention comprises a housing with a space for accommodating and setting; a light guide plate set in the space for accommodating and setting; the light guide plate has a light incident surface; a light source is set in the space for accommodating One side of the space corresponding to the light incident surface; a diffusion sheet stacked on the light guide plate, the diffusion sheet contains a phosphor material; and at least one prism sheet stacked on the diffusion sheet.

The beneficial effect of the present invention is that the present invention is used to add fluorescent powder to the transparent plastic in the manufacturing process of the diffusion sheet to form a diffusion sheet with fluorescent powder, and cooperate with an appropriate light source (such as a blue light-emitting diode), which can be used when the blue light passes through the diffusion sheet. , to excite the phosphor to obtain white light, and through the change of the diffuser material, the light uniformity of the backlight module is greatly improved, and the chromaticity concentration of the white light is improved. In addition, using the blue light emitting diode as the light source can also reduce the cost of the light source of the backlight module.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, the detailed description of the accompanying drawings is as follows:

FIG. 1 is a schematic diagram of a diffusion sheet according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of a diffusion sheet according to another embodiment of the present invention;

FIG. 3 is a schematic diagram of an LED backlight module according to an embodiment of the present invention.

Among them, reference signs:

100: diffuser 110: phosphor

120: Diffuser 200: Diffuser

202: Light-emitting surface 204: Light-incoming surface

210: Phosphor 220: Diffusion agent

300: LED backlight module 310: Housing

312: Reflective layer 314: Blue light-emitting diode device

320: Light guide plate 322: Light incident surface

330: Diffusion sheet 332: Phosphor powder

350: Prism sheet 360: Prism sheet

Detailed ways

The light-emitting diode backlight module, its diffusion sheet and its manufacturing method in the present invention will be described below with reference to the accompanying drawings.

The manufacturing method of the diffuser according to the embodiment of the present invention includes providing a transparent plastic, adding a diffusing agent and a phosphor (such as yellow phosphor) to the transparent plastic, and finally curing the transparent plastic to form a diffuser containing the phosphor. According to an embodiment of the present invention, the material of the transparent plastic may include polycarbonate, and the formed diffuser may have a light-emitting surface and a light-receiving surface, and the phosphor may be evenly distributed in the transparent plastic, or distributed on the light-emitting surface close to the diffuser place. The diffusing agent may contain aluminum oxide.

Please refer to FIG. 1 , which is a schematic diagram of a diffusion sheet according to an embodiment of the present invention. The diffusion sheet 100 is a sheet body made of transparent plastic, which contains fluorescent powder 110 and a diffusion agent 120 which are uniformly distributed in the diffusion sheet 100 .

Referring to FIG. 2 , it is a schematic diagram of a diffusion sheet according to another embodiment of the present invention. The diffusion sheet 200 is a sheet made of transparent plastic, including a body, the body has a light-emitting surface 202 and a light-incident surface 204, the body of the diffusion sheet 200 contains phosphor powder 210 and a diffusing agent 220, and the phosphor powder 210 is distributed at a place close to the light-emitting surface 202 .

Referring to FIG. 3 , it is a schematic diagram of an LED backlight module according to an embodiment of the present invention.

The LED backlight module 300 includes a casing 310 having a space for accommodating and arranging it. The inner surface of the casing 310 has a reflective layer 312 for reflecting light. A light guide plate 320 is disposed in the accommodation space of the casing 310 , wherein the light guide plate 320 has a light incident surface 322 , and a blue LED device 314 is disposed on one side of the accommodation space, corresponding to the light incident surface 322 . A diffusion sheet 330 is stacked on the light guide plate 320 , wherein the diffusion sheet 330 contains fluorescent powder 332 (yellow fluorescent powder). The prism sheet 350 and the prism sheet 360 are sequentially stacked on the diffusion sheet 330 .

The light emitted by the blue light-emitting diode device 314 (i.e., a light source) can directly pass through the light-incident surface 322 or be reflected by the light-reflecting layer 312 and then enter the light guide plate 320 through the light-incidence surface 322, and then turn the light from parallel to 90 degrees through the principle of refraction When passing through the diffusion sheet 330 upward, the blue light excites the phosphor powder 332 to obtain white light, and then passes through the prism sheet 350 and the prism sheet 360 to form white light emitted from the backlight module.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention. All changes and deformations should belong to the protection scope of the appended claims of the present invention.

Claims (10)

1. A diffuser for a light-emitting diode backlight module, characterized in that it comprises: a body having a light-incoming surface and a light-emitting surface; a diffusing agent uniformly distributed inside the body; and A phosphor material is distributed inside the body. 2 . The diffusion sheet of the LED backlight module according to claim 1 , wherein the main body is made of polycarbonate. 3 . 3 . The diffusion sheet of an LED backlight module according to claim 1 , wherein the phosphor material is distributed near the light-emitting surface. 4 . 4. The diffusion sheet of the LED backlight module according to claim 1, wherein the diffusion agent is aluminum oxide. 5. A manufacturing method for forming a diffuser for a light-emitting diode backlight module, characterized in that it comprises: Provide a transparent plastic; adding a diffusing agent to the transparent plastic; adding a fluorescent powder to the transparent plastic; and The clear plastic is cured to form a phosphor-containing diffuser. 6 . The manufacturing method for forming the diffusion sheet of the LED backlight module according to claim 5 , wherein the transparent plastic is polycarbonate. 7. A light-emitting diode backlight module, characterized in that it comprises: A housing with an accommodating and setting space; A light guide plate is arranged in the accommodating space, and the light guide plate has a light incident surface; a light source, located on a side of the accommodation space corresponding to the light-incident surface; a diffusion sheet, stacked on the light guide plate, the diffusion sheet contains a phosphor substance; and At least one prism sheet is stacked on the diffusion sheet. 8. The LED backlight module according to claim 7, wherein the light source is a blue LED device. 9. The LED backlight module as claimed in claim 7, wherein the phosphor material comprises yellow phosphor. 10 . The LED backlight module according to claim 7 , wherein the diffusion sheet has a light incident surface and a light exit surface, and the phosphor material layer is disposed on the light exit surface of the diffusion sheet. 11 .

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