CN107561777A - A backlight module capable of avoiding uneven brightness and darkness and its manufacturing process - Google Patents

Abstract

The invention relates to the technical field of backlight modules, in particular to a backlight module capable of avoiding uneven brightness and darkness and a manufacturing process thereof, wherein the backlight module comprises a back frame, a backlight source which is arranged in the back frame and consists of a plurality of luminous sources, a light guide plate arranged on one side of the backlight source and a diffusion plate arranged on the light guide plate, wherein one side of the light guide plate opposite to the backlight source is provided with a first reflection film, one side of the light guide plate opposite to the diffusion plate is provided with a second reflection film, the reflection surface of the first reflection film faces to the backlight source, and the reflection surface of the second reflection film faces to the diffusion plate; the diffuser plate includes income plain noodles and goes out the plain noodles, and the play plain noodles of diffuser plate sets up to the ripple face, and the ripple face is formed by the same arc convex surface of a plurality of shape and arc concave surface concatenation. The backlight module can effectively improve the phenomenon of uneven brightness caused by overlarge light source distance. The manufacturing process of the backlight module capable of avoiding uneven brightness has the characteristics of simple process, low production cost and suitability for large-scale production.

Description

A backlight module capable of avoiding uneven brightness and darkness and its manufacturing process

technical field

The invention relates to the technical field of backlight modules, in particular to a backlight module capable of avoiding uneven brightness and darkness and a manufacturing process thereof.

Background technique

The structure of the liquid crystal display device includes a liquid crystal panel and a backlight module. The liquid crystal panel itself does not emit light, and needs the light source provided by the backlight module to display images normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display device. According to different incidence modes of the light source, the backlight module can be divided into a direct-type backlight module and an edge-type backlight module. Among them, the side-type backlight module is to install the backlight LED strip on the edge of the back panel behind the liquid crystal panel. The light emitted by the LED strip enters the light guide plate from the light incident surface on one side of the light guide plate and is reflected and diffused. It emits from the light-emitting surface of the light guide plate, and then passes through the optical film group to form a surface light source and provide it to the liquid crystal panel.

In the backlight module in the prior art, the light source is generally diffused through the light guide plate and then through the diffuser plate. However, in the prior art, since the light source is generally composed of a plurality of LED lamps arranged in a group, if the distance between the LED lamps of the light source is too large, dark areas will be formed between the light sources, resulting in uneven brightness and darkness. The phenomenon of poor optical quality. Although the phenomenon of uneven brightness and darkness can be improved by reducing the distance between the light sources, the number of light sources used in the backlight module will increase, which will lead to an increase in the cost of the backlight module.

Contents of the invention

One of the objectives of the present invention is to provide a backlight module capable of avoiding uneven brightness and darkness in view of the deficiencies in the prior art.

The second object of the present invention is to provide a manufacturing process of a backlight module capable of avoiding uneven brightness and darkness in view of the shortcomings of the prior art.

To achieve one of the above objects, the present invention provides the following technical solutions:

A backlight module capable of avoiding uneven brightness and darkness is provided, comprising a back frame, a back light source arranged in the back frame and composed of a plurality of light emitting sources, a light guide plate arranged on one side of the back light source, and The diffusion plate arranged on the light guide plate is characterized in that: the side of the light guide plate opposite to the backlight is provided with a first reflection film, and the side of the light guide plate opposite to the diffusion plate is provided with a second reflection film. A reflective film, the reflective surface of the first reflective film faces the backlight, and the reflective surface of the second reflective film faces the diffusion plate;

The diffuser plate includes a light incident surface and a light output surface, and the light output surface of the diffuser plate is configured as a corrugated surface, and the corrugated surface is formed by splicing several arc-shaped convex surfaces and arc-shaped concave surfaces with the same shape.

The arc-shaped convex surface is configured as a semicircular convex surface, and the arc-shaped concave surface is configured as a semicircular concave surface.

The radii of the semicircular convex surface and the semicircular concave surface are both set to 0.01mm˜3mm.

The radii of the semicircular convex surface and the semicircular concave surface are both set to 1mm.

The corrugated surface and the diffusion plate are integrally structured.

The diffusion plate is made of PP plastic.

The diffusion plate is a diffusion plate made of PET plastic.

The diffusion plate is a diffusion plate made of HDPE plastic.

Both the first reflective film and the second reflective film are silver-plated reflective films.

In order to achieve the above object two, the present invention provides the following technical solutions:

A manufacturing process of a backlight module capable of avoiding uneven brightness and darkness is provided, which includes the following steps:

Step 1, install the backlight in the back frame;

Step 2, disposing the first reflective film on the side of the light guide plate opposite to the backlight source, disposing the second reflective film on the side opposite to the diffuser plate, and then installing the light guide plate on the back frame;

Step 3, setting the diffuser plate on the guide rail plate to obtain the backlight module capable of avoiding uneven brightness and darkness.

Beneficial effects of the present invention:

(1) A backlight module capable of avoiding uneven brightness and darkness according to the present invention includes a back frame, a back light source arranged in the back frame and composed of a plurality of light emitting sources, a light guide plate arranged on one side of the back light source, And the diffusion plate arranged on the light guide plate, the side of the light guide plate opposite to the backlight is provided with a first reflection film, the side of the light guide plate opposite to the diffusion plate is provided with a second reflection film, and the reflection surface of the first reflection film faces the backlight , the reflective surface of the second reflective film faces the diffuser plate; the diffuser plate includes a light incident surface and a light output surface, the light output surface of the diffuser plate is set as a corrugated surface, and the corrugated surface is formed by splicing several arc-shaped convex surfaces and arc-shaped concave surfaces of the same shape . Through the reflection of the first reflective film and the second reflective film on the light incident on the light guide plate, the light incident on the light guide plate from the backlight composed of a plurality of light source arrays can be made uniform, and then the original distance between the light sources is too large. The resulting uneven brightness and darkness is effectively improved. In addition, since the light emitting surface of the diffuser is set as a corrugated surface, the corrugated surface can enhance the scattering effect when emitting light, and can make the light scattered by the diffuser more uniform, thereby further improving the phenomenon of uneven brightness and darkness.

(2) A backlight module of the present invention that can avoid uneven brightness and darkness has the characteristics of simple structure, low production cost, and is suitable for large-scale production.

(3) A manufacturing process of a backlight module capable of avoiding uneven brightness and darkness of the present invention has the characteristics of simple process, low production cost, and suitable for large-scale production.

Description of drawings

FIG. 1 is a schematic structural diagram of a backlight module capable of avoiding uneven brightness and darkness according to the present invention.

Reference signs:

back frame 1;

Backlight 2;

Light guide plate 3;

Diffusion plate 4, light incident surface 41, light exit surface 42, arc convex surface 401, arc concave surface 402;

the first reflective film 5;

The second reflective film 6 .

detailed description

The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

Example 1.

A backlight module capable of avoiding uneven brightness and darkness in this embodiment, as shown in FIG. The light guide plate 3 on one side of the source 2 and the diffusion plate 4 arranged on the light guide plate 3, the first reflective film 5 is arranged on the side of the light guide plate 3 opposite to the backlight 2, and the side of the light guide plate 3 opposite to the diffusion plate 4 is arranged There is a second reflection film 6, the reflection surface of the first reflection film 5 faces the backlight 2, and the reflection surface of the second reflection film 6 faces the diffusion plate 4; the diffusion plate 4 includes a light incident surface 41 and a light exit surface 42, and the diffusion plate 4 The light-emitting surface 42 is configured as a corrugated surface, and the corrugated surface is formed by splicing several arc-shaped convex surfaces 401 and arc-shaped concave surfaces 402 with the same shape. Through the reflection of the first reflective film 5 and the second reflective film 6 on the light incident on the light guide plate 3, the light incident on the light guide plate 3 from the backlight source 2 composed of a plurality of light source arrays can be made uniform, and then the original cause The phenomenon of uneven brightness and darkness caused when the distance between light sources is too large is effectively improved. In addition, since the light emitting surface 42 of the diffuser plate 4 is set as a corrugated surface, the corrugated surface can enhance the scattering effect when emitting light, and can make the light scattered by the diffuser plate 4 more uniform, thereby further improving the phenomenon of uneven brightness and darkness.

In this embodiment, the curved convex surface 401 is set as a semicircular convex surface, and the curved concave surface 402 is set as a semicircular concave surface, which can better enhance the scattering effect when the light is emitted, and can make the light scattered by the diffuser plate 4 more uniform, thereby enabling Further improve the phenomenon of uneven brightness and darkness.

In this embodiment, the radii of the semicircular convex surface and the semicircular concave surface are both set to 1mm. The corrugated surface formed by splicing the semicircular convex surface and the semicircular concave surface of this radius can better enhance the scattering effect when emitting light, can make the light scattered by the diffuser plate 4 more uniform, and further improve the phenomenon of uneven brightness and darkness.

In this embodiment, the corrugated surface and the diffuser plate 4 are of an integrated structure, so that light can be diffracted at the light exit surface 42 after entering the diffuser plate 4 and exit the diffuser plate 4, thereby reducing the loss of light energy and greatly Improved light utilization.

In this embodiment, the diffusion plate 4 is made of PP plastic, which can make the light scattered by the diffusion plate 4 more uniform, and further improve the phenomenon of uneven brightness and darkness.

In this embodiment, both the first reflective film 5 and the second reflective film 6 are set as silver-plated reflective films, which have a good reflection effect, and can make the backlight 2 composed of a plurality of light source arrays enter the light guide plate 3 The uniformity of the light, thereby effectively improving the uneven brightness and darkness caused by the excessively large distance between the light sources.

Example 2.

Embodiment 2 of a backlight module capable of avoiding uneven brightness and darkness of the present invention, the difference between this embodiment and Embodiment 1 is that in this embodiment, the radii of the semicircular convex surface and the semicircular concave surface are both set to 0.01mm , the corrugated surface spliced by the semicircular convex surface and the semicircular concave surface of this radius can better enhance the scattering effect when the light is emitted, and can make the light scattered by the diffuser plate 4 more uniform, thereby further improving the phenomenon of uneven brightness and darkness . In this embodiment, the diffusion plate 4 is made of PET plastic, which can make the light scattered by the diffusion plate 4 more uniform, and further improve the phenomenon of uneven brightness and darkness. Other structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

Example 3.

Embodiment 3 of a backlight module capable of avoiding uneven brightness and darkness of the present invention is different from Embodiment 1 in that, in this embodiment, the radii of the semicircular convex surface and the semicircular concave surface are both set to 3mm, The corrugated surface formed by splicing the semicircular convex surface and the semicircular concave surface of this radius can better enhance the scattering effect when emitting light, can make the light scattered by the diffuser plate 4 more uniform, and further improve the phenomenon of uneven brightness and darkness. In this embodiment, the diffusion plate 4 is made of HDPE plastic, which can make the light scattered by the diffusion plate 4 more uniform, and further improve the phenomenon of uneven brightness and darkness. Other structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

Example 4.

A manufacturing process of a backlight module capable of avoiding uneven brightness and darkness of the present invention is characterized in that it comprises the following steps:

Step 1, installing the backlight 2 in the back frame 1;

Step 2, disposing the first reflective film 5 on the side of the light guide plate 3 opposite to the backlight 2, disposing the second reflective film 6 on the side opposite to the diffuser plate 4, and then installing the light guide plate 3 on the back frame 1;

In step 3, the diffuser plate 4 is placed on the guide rail plate 3 to obtain a backlight module capable of avoiding uneven brightness and darkness.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand , the technical solution of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. a kind of backlight module for being avoided that brightness unevenness, including back frame, it is arranged at being arranged by multiple light emitting sources in the back frame Backlight, the diffuser plate for being arranged at the light guide plate of the backlight side and being arranged on the light guide plate of composition are arranged, its It is characterised by：The side of the relatively described backlight of the light guide plate is provided with the first reflectance coating, the relatively described expansion of the light guide plate The side fallen apart is provided with the second reflectance coating, and the reflecting surface of first reflectance coating reflects towards the backlight, described second The reflecting surface of film is towards the diffuser plate；

The diffuser plate includes incidence surface and exiting surface, and the exiting surface of the diffuser plate is arranged to corrugated surface, the corrugated surface by Several shape identical arc convex and arc-shaped concave are spliced.

A kind of 2. backlight module for being avoided that brightness unevenness according to claim 1, it is characterised in that：The arc convex Half rounded convex is arranged to, the arc-shaped concave is arranged to semicircular concave.

A kind of 3. backlight module for being avoided that brightness unevenness according to claim 2, it is characterised in that：Half rounded convex 0.01mm~3mm is disposed as with the radius of the semicircular concave.

A kind of 4. backlight module for being avoided that brightness unevenness according to claim 3, it is characterised in that：Half rounded convex 1mm is disposed as with the radius of the semicircular concave.

A kind of 5. backlight module for being avoided that brightness unevenness according to claim 1, it is characterised in that：The corrugated surface with The diffuser plate is integrative-structure.

A kind of 6. backlight module for being avoided that brightness unevenness according to claim 1, it is characterised in that：The diffuser plate is Diffuser plate made of PP plastics.

A kind of 7. backlight module for being avoided that brightness unevenness according to claim 1, it is characterised in that：The diffuser plate is Diffuser plate made of PET.

A kind of 8. backlight module for being avoided that brightness unevenness according to claim 1, it is characterised in that：The diffuser plate is Diffuser plate made of HDPE plastic.

A kind of 9. backlight module for being avoided that brightness unevenness according to claim 1, it is characterised in that：First reflection Film and second reflectance coating are disposed as silvered reflective film.

10. a kind of manufacturing process of backlight module for being avoided that brightness unevenness described in claim 1 to 9 any one, it is special Sign is：It comprises the following steps：

Step 1, backlight is arranged in back frame；

Step 2, side of the light guide plate with respect to backlight is arranged at by the first reflectance coating, and the second reflectance coating is arranged at into relative expansion The side fallen apart, then light guide plate be installed on back frame；

Step 3, then diffuser plate is arranged on guide-rail plate, that is, the backlight module for being avoided that brightness unevenness is made.