CN202494798U - Light guide plate, backlight module and liquid crystal display device - Google Patents

Abstract

The utility model provides a light guide plate, a backlight module and a liquid crystal display device, belonging to the field of liquid crystal displays. The light guide plate includes a light guide plate base material, the light guide plate base material includes an incident surface for receiving light beams, a bottom surface connected to the incident surface, and an exit surface connected to the incident surface and opposite to the bottom surface, the light guide plate The light plate also includes: at least one network dot formed on the outgoing surface; wherein, the other four surfaces of the light guide plate substrate except the incident surface and the outgoing surface are covered with reflective layers, and the outgoing surface A reflective layer is covered on other parts of the upper surface except the dots. The technical scheme of the utility model can simplify the structure of the backlight module, reduce the cost of the backlight module, and improve the astigmatism of the light guide plate.

Description

Light guide plate, backlight module and liquid crystal display device

technical field

The utility model relates to the field of liquid crystal display, in particular to a light guide plate, a backlight module and a liquid crystal display device.

Background technique

The backlight module is a key component of the liquid crystal display, and the backlight module can provide a light source with sufficient brightness and uniformity, so that the liquid crystal display panel can display normally. In order to make the brightness of the light source of the backlight module sufficiently uniform, it is usually necessary to add a light guide plate to the backlight module. The light guide plate is an optical film that can atomize a line light source (such as: CCFL (Cold Cathode Fluorescent Lamp, cold cathode fluorescent lamp)) or a point light source (such as: LED (Light Emitting Diode, light emitting diode)) into a uniform surface light source.

As shown in Figure 1, the existing light guide plate utilizes the total reflection of light inside the base material 1 of the light guide plate to spread the light emitted by the light source 2 throughout the base material 1 of the light guide plate. Sparse and dense white dots 3 scatter the light and emit it. This requires adding a reflective film 4 under the base material 1 of the light guide plate in order to re-reflect the light that cannot be fully reflected back to the base material 1 of the light guide plate. In this way, the structure of the backlight module is relatively complicated, and the astigmatism of the light guide plate is relatively poor.

Utility model content

The technical problem to be solved by the utility model is to provide a light guide plate, a backlight module and a liquid crystal display device, which can simplify the structure of the backlight module, reduce the cost of the backlight module, and improve the astigmatism of the light guide plate.

In order to solve the problems of the technologies described above, the utility model provides technical solutions as follows:

A light guide plate, the light guide plate includes a light guide plate base material, the light guide plate base material includes an incident surface for receiving light beams, a bottom surface connected to the incident surface, and an exit surface connected to the incident surface and opposite to the bottom surface On the other hand, the light guide plate also includes:

at least one dot formed on the exit surface;

Wherein, the other four surfaces of the base material of the light guide plate except the incident surface and the outgoing surface are covered with a reflective layer, and the other parts of the outgoing surface except the dots are covered with a reflective layer.

Further, the other four surfaces of the light guide plate substrate except the incident surface and the exit surface are coated with light-reflecting materials, and the other parts of the exit surface except the dots are coated with reflective material.

Further, the reflective material is reflective ink.

Wherein, the reflective material is white optical ink containing _TiO2 .

Further, the dots are coated with light-scattering materials.

Wherein, the dots are coated with at least one circular astigmatism particle.

Further, the grid dots are arranged in rows, and the diameter of the grid dots gradually increases from a direction close to the incident surface of the light guide plate substrate to a direction away from the incident surface.

Further, the grid dots are arranged in rows, and the row spacing between the grid dots is gradually smaller from the direction closer to the incident surface of the light guide plate substrate to away from the incident surface.

The embodiment of the utility model also provides a backlight module, including the above-mentioned light guide plate.

The embodiment of the utility model also provides a liquid crystal display device, including the above-mentioned backlight module.

Embodiments of the utility model have the following beneficial effects:

The light guide plate substrate is covered with a reflective layer on all four sides except the incident surface and the exit surface, so that the light emitted by the light source will only propagate inside the light guide plate substrate, and will not exit from the bottom surface of the light guide plate substrate, so There is no need to set a reflective film on the side of the bottom surface of the light guide plate base material, so that the structure of the backlight module can be simplified and the cost of the backlight module can be reduced; in addition, the dots on the exit surface of the light guide plate base material are not covered with a reflective layer. The light propagating inside the base material of the light guide plate can exit from the exit surface, which can atomize the line light source or point light source into a uniform surface light source.

Description of drawings

FIG. 1 is a schematic structural diagram of a light guide plate in the prior art;

Fig. 2 is a structural schematic diagram of the light guide plate of the present invention;

Fig. 3 is a three-dimensional schematic diagram of a light guide plate of the present invention;

FIG. 4 is an enlarged schematic diagram of dots in part a shown in FIG. 2 .

reference sign

1Light guide plate substrate

2 light sources

3 white dots

4 reflective diaphragm

5 outlets

6 reflective material

7 astigmatism particles

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

The embodiment of the utility model aims at the problems that the structure of the backlight module in the prior art is complex and the astigmatism of the light guide plate is not very good, and provides a light guide plate, a backlight module and a liquid crystal display device, which can make the structure of the backlight module Simplify, reduce the cost of the backlight module, and improve the astigmatism of the light guide plate.

The light guide plate of the utility model is applied in a backlight module, and the light guide plate includes a base material of the light guide plate, and the base material of the light guide plate includes an incident surface for receiving light beams, a bottom surface connected with the incident surface and a And on the exit surface opposite to the bottom surface, the light guide plate further includes: at least one dot formed on the exit surface;

Wherein, the other four surfaces of the base material of the light guide plate except the incident surface and the outgoing surface are covered with a reflective layer, and the other parts of the outgoing surface except the dots are covered with a reflective layer.

Specifically, the other four surfaces of the base material of the light guide plate except the incident surface and the outgoing surface are coated with light-reflecting materials, and the other parts of the outgoing surface except the dots are coated with light-reflecting materials.

In the embodiment of the present invention, the light emitted by the light source enters the base material of the light guide plate from the incident surface. It propagates inside the base material of the light guide plate, and does not emit from the bottom surface of the base material of the light guide plate, so there is no need to set a reflective film on the bottom side of the base material of the light guide plate, so that the structure of the backlight module can be simplified and the backlight module can be reduced. In addition, the dots on the exit surface of the light guide plate substrate are not covered with a reflective layer, so that the light propagating inside the light guide plate substrate can exit from the exit surface, and the line light source or point light source can be atomized into a uniform surface light source.

The light guide plate of the present invention will be further described in conjunction with Fig. 2 and Fig. 3 below:

As shown in Figure 2, the light guide plate of this embodiment is applied in a backlight module, the light guide plate includes a light guide plate base material 1, the light guide plate base material 1 includes an incident surface for receiving light beams, and an incident surface connected to the incident surface. The bottom surface and an exit surface connected to the incident surface and opposite to the bottom surface, the light guide plate also includes: at least one dot 5 formed on the exit surface; wherein, the light guide plate substrate 1 has four other surfaces except the incident surface and the exit surface All are coated with reflective material 6, and other parts of the exit surface are coated with reflective material 6 except for dots.

Furthermore, in order to improve the light astigmatism of the light guide plate, the dots 5 are also coated with light astigmatism materials to achieve the purpose of diffusing light. Specifically, as shown in FIG. 4 , at least one circular astigmatism particle 7 is coated on the dot 5 .

Further, as shown in FIG. 3 , the grid dots 5 are arranged in rows on the exit surface of the light guide plate substrate 1, specifically, they can be arranged in parallel rows. The diameter of the dots 5 increases gradually from the incident surface of the light plate substrate 1 to the direction away from the incident surface. Or, in the direction from close to the incident surface of the light guide plate substrate 1 to away from the incident surface, the line spacing between the grid dots 5 becomes gradually smaller.

In the embodiment of the present utility model, the reflective material 6 may be reflective ink, further, the reflective material 6 may be white optical ink containing TiO ₂ .

The utility model provides a new type of light guide plate. The light guide plate prints materials with high reflectivity and no light absorption on the exit surface and bottom surface of the base material of the traditional light guide plate. Covered with light-scattering particles to achieve the purpose of light diffusion. The light guide plate of the utility model can make full use of the light emitted by the light source, and strives to transform from a line light source to a surface light source. Compared with the traditional light guide plate that uses total reflection to spread the light emitted by the light source inside the entire light guide plate base material, the light guide plate of the present invention has lower requirements on the optical path, and does not need to place reflectors on the bottom side of the light guide plate. The diaphragm can simplify the structure of the backlight module and reduce the cost of the backlight module; in addition, the exit surface of the light guide plate base material is designed with dots ranging from sparse to dense, from small to large, and the coating on the dots has the property of astigmatism particles, so that the light propagating inside the base material of the light guide plate can exit from the dots on the exit surface, which can atomize the line light source into a uniform surface light source, and improve the astigmatism of the light guide plate.

When making the light guide plate of the present utility model, it is first necessary to uniformly print white reflective ink on the other five sides of the base material of the light guide plate except the incident surface, and then engrave dots on the exit surface of the base material of the light guide plate. The dot structure is V-shaped groove or circular dot. Among them, the farther away from the light source, the denser and larger the dots are, and finally the astigmatism particles are coated on the dots.

Among them, the preparation process of the above dots can be printing or non-printing, for example, baking, ultraviolet curing, chemical etching, photolithography and precision mechanical characterization, etc. The dots of the light guide plate formed by these preparation processes can be in various shapes The microstructure arrays, such as lens arrays, spherical arrays, tetrahedral corner cube arrays, etc., can also be concave grooves or convex grooves of various shapes, such as V-shaped grooves. After the astigmatism particles are coated on the dots, the light can be diffused more uniformly and the uniformity is better. The structure of the dots is not limited to the structure described above. within the scope of protection.

The embodiment of the utility model also provides a backlight module, including the above-mentioned light guide plate. The backlight module does not include a reflective film arranged on the bottom side of the light guide plate. The bottom surface is covered with a reflective layer, specifically, it can be realized by coating the bottom surface with a reflective material, so that the incident light will not exit from the bottom surface, so there is no need to set a reflective film on the bottom surface of the light guide plate, so that the backlight module The structure is simplified, thereby reducing the cost of the backlight module.

The embodiment of the utility model also provides a liquid crystal display device, including the above-mentioned backlight module.

It should be noted that: "one" in the present utility model is not used as a limited quantity term.

The foregoing is a preferred embodiment of the present utility model, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the present utility model. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (10)

1. LGP; Said LGP comprises the LGP base material; Said LGP base material comprises that the bottom surface that the plane of incidence in order to receiving beam, links to each other with the plane of incidence links to each other and the exit facet relative with the bottom surface with the plane of incidence with one, is characterized in that said LGP also comprises:

Be formed at least one site on the said exit facet;

Wherein, said LGP base material all is coated with reflector layer on other four sides except that the said plane of incidence and said exit facet, is coated with reflector layer on other part on the said exit facet except that said site.

2. LGP according to claim 1; It is characterized in that; Said LGP base material is coated with reflectorized material on other four sides except that the said plane of incidence and said exit facet, and other part on the said exit facet except that said site is coated with reflectorized material.

3. LGP according to claim 2 is characterized in that, said reflectorized material is reflective printing ink.

4. LGP according to claim 3 is characterized in that said reflectorized material is for including TiO ₂White optical printing ink.

5. LGP according to claim 1 is characterized in that, is coated with diffusion material on the said site.

6. LGP according to claim 5 is characterized in that, is coated with at least one circular astigmatic particle on the said site.

7. LGP according to claim 1 is characterized in that, said site is row arranges, near the plane of incidence of said LGP base material on direction away from the said plane of incidence, the diameter of said site increases gradually.

8. LGP according to claim 1 is characterized in that, said site is row arranges, near the plane of incidence of said LGP base material on direction away from the said plane of incidence, the line-spacing between the said site is less gradually.

9. a module backlight is characterized in that, comprises like each described LGP among the claim 1-8.

10. a liquid crystal indicator is characterized in that, comprises module backlight as claimed in claim 9.

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