CN103777259A - Optical films for edge-lit backlight modules - Google Patents

Abstract

The invention relates to an optical diaphragm suitable for a side light type backlight module, wherein one surface of the optical diaphragm is provided with a plurality of strip-shaped micro prism columns which are densely distributed on one surface of the optical diaphragm in a row way, and the micro prism columns extend in a left-right continuous bending way; in at least one edge region of the optical film along the extending direction of the micro prism columns, the distance between each left and right continuous bending formed by each micro prism column is relatively smaller than the distance between other regions of the optical film, so that the left and right continuous bending of each micro prism column in the near edge region are formed more densely, and a light source scattering region is formed by the left and right continuous bending design formed more densely.

Description

Optical films for edge-lit backlight modules

technical field

The present invention still relates to an optical film suitable for a side-lit backlight module, especially an optical film for the purpose of diffusing and homogenizing the light source while concentrating the light source.

Background technique

Press, a backlight module (Back light Module) according to the way of its light source is divided into two types; one is the side light backlight module (Type of back lighe module); one is the direct backlight module (Direct back light module).

Wherein, as shown in FIG. 1 , the edge-lit backlight module 1 at least includes: a light guide plate 11 , a reflective film 12 , an optical film 13 and a light source 14 .

Wherein, the light guide plate 11 has at least a light incident surface 111, a reflective surface 112 and a light output surface 113; wherein, the light incident surface 111 is used to receive the light source output by the lamp source 14; The light source is reflected, and part of the design can be further provided with a light guide pattern (not shown) on the reflective surface 112, so as to facilitate the homogenization of the light source when it is reflected; The light source is used for external output, and part of the design will further form a very large number of parallel prism columns (not shown) on the light-emitting surface 113, so that when the light source leaves the light guide plate 11, it is immediately affected by the light source. The prism cylinder acts to achieve the action of concentrating light; the reflective film 12 can reflect the light source leaked out of the light guide plate 11 through the reflective surface 112 and enter the light guide plate 11 again. After leaving the light guide plate 11 , the light source leaves the light guide plate 11 after being concentrated by the optical film 13 .

Again, as shown in Figure 2, the surface of the optical film 13 is formed with a very large number of micro-prism columns 131, and the micro-prism columns 131 are continuously curved from left to right along their arrangement direction, or further into continuous heights. The undulating shape, in this way, when the light source is concentrated and output through the micro prism cylinders 131, the output light source will not be too consistent after the action, so as to avoid the phenomenon of diffraction.

However, even though the miniature prism cylinders 131 of the conventional optical film 13 are designed with left and right continuous curves and continuous ups and downs, the distances formed by each of the left and right continuous curves and continuous ups and downs are all the same and consistent. , therefore, the effect on the light source should also be the same, such a state cannot further provide appropriate effects on light sources with different light intensities. When implementing the application, the light intensity at the position near the light source 14 can only be responded to by relying on the distribution of the light guide pattern on the light guide plate 11, but relying only on the design and distribution of the light guide pattern on the light guide plate 11 is often not enough Therefore, the strong light source near the light source 14 has not been uniformed enough, and the light output of the side-light backlight module 1 is not ideal.

In this regard, there is indeed room for improvement for the optical film 13 of the side-lit backlight module 1 , and this item is also a problem that the relevant industry needs to overcome.

Contents of the invention

The present invention relates to an optical film suitable for a side-lit backlight module. The technical problem it solves is that while solving the problem of concentrating light on the light source by the conventional optical film, it is impossible to combine the power of the light source. Function to perform diffusion homogenization.

The technical means adopted in the present invention are as follows.

For this reason, the present invention is to provide an optical film suitable for side-light backlight modules. One surface of the optical film of the present invention has a plurality of strip-shaped micro-prism cylinders, and the micro-prism cylinders are arranged in an arrangement. And it is densely distributed on a surface of the optical film, and the micro prism columns are extended in a continuous left and right shape, wherein, in at least one edge area of the optical film along the extending direction of the micro prism columns, each The distance between each left and right continuous bending formed by the micro prism cylinders is relatively smaller than the distance between other regions of the optical film, so that the left and right continuous curvature of each micro prism cylinder in the near edge area is more densely formed, by The more densely formed left and right continuous curved designs form a light source scattering area.

An optical film suitable for an edge-lit backlight module, comprising an optical film and strip-shaped micro-prism cylinders arranged on the surface of the optical film, the micro-prism cylinders are arranged in an arrangement and densely distributed on the optical film A surface of the micro prism cylinders, and these micro prism cylinders are extended in a continuous left and right shape, and in at least one edge area of the optical film along the extension direction of the micro prism cylinders, each of the micro prism cylinders formed by each The distance between the left and right continuous curves is relatively smaller than the distance between other areas of the optical film, so that the left and right continuous curves of the miniature prisms in the near-edge area are more densely formed, and the left and right continuous curves are more densely formed. A light source scattering area is formed.

The other corresponding surface of the design surface of the miniature prism cylinder is an atomized rough surface.

The backlight module at least includes a light guide plate, a reflective film and a light source. The light guide plate has at least one light incident surface, a reflective surface and a light output surface. The reflective film is arranged outside the reflective surface of the light guide plate. The light source It is arranged at a corresponding position outside the light incident surface, and is characterized in that the optical film is arranged outside the light exit surface of the light guide plate, and the light source scattering area of the optical film corresponds to the light exit surface near the light entrance surface of the light guide plate Location.

The light guide plate is in the shape of a flat plate.

The light guide plate is wedge-shaped.

The beneficial effects produced by the present invention are as follows.

When the light source passes through the optical film of the present invention to emit light, the passing light source can be acted on by each micro-prism cylinder of the optical film to avoid the diffraction phenomenon of the light source. In addition, when a part of the light source is the light source through the optical film In the case of the scattering area, the denser left and right continuous curved design in the light source scattering area enables the light source after its action to achieve the effect of diffusion and uniformity. As mentioned above, when the optical film of the present invention is used in the side-lit backlight module for its light output, the more dense left and right continuous curved design in the light source scattering area of the optical film of the present invention can correspond to the light guide plate In the region where the light-emitting surface is close to the light-incident surface, the strong light from the light-emitting surface of the light guide plate is close to the light-incident surface, which can be diffused evenly by the light source scattering area of the optical film of the present invention.

Description of drawings

FIG. 1 is a schematic diagram of a conventional edge-lit backlight module.

FIG. 2 is a schematic diagram of a conventional optical film.

Fig. 3 is a schematic diagram of the optical film of the present invention.

Fig. 4 is a schematic diagram of another embodiment.

5, 6 and 7 are schematic diagrams of application embodiments of the present invention.

Description of figure number:

1 side-lit backlight module

11 light guide plate

111 incident surface

112 reflective surface

113 light emitting surface

12 reflective film

13 optical film

131 miniature prism cylinder

14 light sources

2 optical film

21 miniature prism cylinders

22 light source scattering area

23 rough surface

3 light guide plate

31 incident surface

32 reflective surface

33 light emitting surface

4 reflective diaphragm

5 light sources.

Detailed ways

As shown in FIG. 3 , the optical film suitable for the edge-lit backlight module of the present invention includes an optical film 2 and a plurality of strip-shaped micro-prism cylinders 21 disposed on one surface of the optical film 2 . Wherein, the miniature prism cylinders 21 are arranged in an arrangement and are densely distributed on a surface of the optical film 2, and these microprism cylinders 21 are extended in a continuous curved shape from left to right, and on the optical film 2 along the microprism In at least one edge region of the extension direction of the cylinder 21, the distance between each left and right continuous curvature formed by each of the micro-prism cylinders 21 is relatively smaller than the distances in other regions of the optical film 2, so that in the near-edge region Each micro-prism cylinder 21 is formed more densely in a left-right continuous curved shape, and a light source scattering area 22 is formed by the more densely formed left-right continuous curved design.

When the light source passes through the optical film 2 to emit light, it can act on the passing light source through the micro-prism cylinders 21 in the optical film 2, thereby avoiding the light source from causing diffraction phenomenon. On the other hand, When a part of the light source passes through the light source scattering area 22 of the optical film 2, the more dense left and right continuous curved design in the light source scattering area 22 makes the light source after its action even more uniform in diffusion. The effect of the optical film 2 of the present invention on the light source is shown in the menu. One can avoid the diffraction phenomenon of the light source, and the two also have the function of diffusing and homogenizing the light source.

Again, as shown in Figure 4, the present invention can make another corresponding surface of the design surface of the miniature prism cylinder 21 become an atomized rough surface 23, and the light source can pass through the atomized rough surface 23 When the optical film 2 is invented, the rough surface 23 further strengthens the diffusion and homogenization performance of the light source.

When the present invention is applied to a side-lit backlight module, as shown in FIGS. 5 and 6 , the side-lit backlight module at least has a flat light guide plate 3 , a reflective film 4 and a light source 5 . The light guide plate 3 has at least a light incident surface 31, a reflective surface 32 and a light output surface 33; In the corresponding position outside the surface 31, the optical film 2 of the present invention is arranged outside the light-emitting surface 33 of the light guide plate 3, and the light source scattering area 22 of the optical film 2 of the present invention corresponds to the light-incoming surface of the light guide plate 3. 31 on the light emitting surface 33 position.

Yes, when the light source from the light source 5 enters the light guide plate 3 through the light incident surface 31, a part of the light source will be directly emitted from the light exit surface 33, and part of it will be reflected by the reflective surface 32 of the light guide plate 3 and the reflective film 4. will be emitted from its light-emitting surface 33 to the outside. These light sources that leave the light guide plate 3 then enter the optical film 2 of the present invention, and continue to penetrate the optical film 2 to emit light, and by the action of the micro-prism cylinder 21 of the optical film 2, it can make it The light source that emits light avoids diffraction phenomenon, wherein, the light emitting surface 33 of the light guide plate 3 is in the area near the light source 5, because it is closer to the light source 5, it will naturally receive relatively strong light energy. It can be adjusted by the design and distribution of the light guide pattern (not shown) on the reflective surface 32 of the light guide plate 3. In addition, the light source scattering area 22 of the optical film 2 of the present invention has a denser The left and right continuous bending design makes the strong light in this area of the light guide plate 3 just be diffused and homogenized by the light source scattering area 22 of the optical film 2 of the present invention, which helps to make the overall light intensity trend The near-consistency makes the light source provided by the edge-lit backlight module more uniform.

Furthermore, as shown in FIG. 7 , in the edge-lit backlight module applied to the optical film 2 of the present invention, the light guide plate 3 therein can also be a wedge-shaped light guide plate 3 .

The effect of the present invention is that one surface of the optical film 2 of the present invention is densely covered with strip-shaped micro-prism cylinders 21, and these micro-prism cylinders 21 extend in a continuous curved shape from left to right, wherein the optical film In at least one edge region of the sheet 2 along the extension direction of the micro-prism cylinders 21, the distance between each left and right continuous curvature formed by each of the micro-prism cylinders 21 is relatively smaller than the distance in other regions of the optical film 2, so that the The micro-prism cylinders 21 in the near-edge area are more densely curved left and right, and a light source scattering region 22 is formed by the more densely formed left and right continuous curved design. And make each miniature prism cylinder 21 in the optical film 2 act on the passing light source, so as to avoid the diffraction phenomenon of the light source. , and by virtue of the denser left and right continuous bending design in the light source scattering area 22, the light source after its action can achieve the effect of diffusion and homogenization, so that the optical film 2 of the present invention acts on the light source, In addition to avoiding the diffraction phenomenon of the light source, it also has the functional purpose of diffusing and homogenizing the light source.

Claims (5)

1. An optical film suitable for side-light backlight modules, comprising an optical film and strip-shaped micro-prism cylinders arranged on the surface of the optical film, the micro-prism cylinders are arranged in an arrangement and densely distributed on the optical film. One surface of the diaphragm, and the micro prism columns extend in a left and right continuous curved shape, it is characterized in that, in at least one edge area of the optical film along the extending direction of the micro prism columns, each micro prism column The spacing of each left and right continuous bending formed by the body is relatively smaller than the spacing of other areas of the optical film, so that the left and right continuous bending of each micro prism column in the near edge area is more densely formed, and by more densely forming The left and right continuous curved design forms a light source scattering area. 2 . An optical film suitable for an edge-lit backlight module as claimed in claim 1 , wherein the other corresponding surface of the micro-prism cylinder design surface is a fogged rough surface. 3 . 3. An optical film suitable for an edge-lit backlight module as claimed in claim 1, the backlight module at least includes a light guide plate, a reflective film and a light source, and the light guide plate has at least one incident light Surface, reflective surface and light-emitting surface, the reflective film is set outside the reflective surface of the light guide plate, the light source is set at the corresponding position outside the light incident surface, the feature is that the optical film is set on the light guide plate Outside the light exit surface of the optical film, and make the light source scattering area of the optical film correspond to the position of the light exit surface of the light guide plate near the light entrance surface. 4. An optical film suitable for an edge-lit backlight module according to claim 3, wherein the light guide plate is in the shape of a flat plate. 5. An optical film suitable for an edge-lit backlight module as claimed in claim 3, wherein the light guide plate is wedge-shaped.

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