CN201096908Y - Optical diffusion assembly - Google Patents

Abstract

The optical diffusion component of the utility model is mainly provided with a plate body, and a plurality of light sources are arranged on one side of the plate body; the plate body comprises a plurality of optical microstructures with long and short axes, the curvature of the short axis is larger than that of the long axis, so that the diffusion effect in the direction of the long axis is poor in the direction of the short axis, and the long axis direction of each optical microstructure is slightly parallel to the extending direction of the light source, or the short axis direction of each optical microstructure is slightly orthogonal to the extending direction of the light source, so that each light source obtains a better diffusion effect through the short axis of the optical microstructure, the light quantity among the light sources can be increased, the dim zone among the light sources is eliminated, and the brightness of the whole backlight module is improved.

Description

Optical Diffusion Components

technical field

The utility model relates to an optical diffusion component, which aims to provide a backlight module that can more effectively distribute the light of a light source and improve the luminance of the whole backlight module.

Background technique

Backlight module (Backlight module) generally refers to a component that can provide a back light source for the product. It is currently used in various information, communication, and consumer products, such as: Liquid Crystal Display (LCD), film scanner, slide viewing box and other products. Depending on the incident position of the light source, backlight modules can be divided into two types: edge lighting and bottom lighting. Edge lighting is usually used in portable computers that require power saving and thinness. on the product. In order to meet the thin and light requirements, the light source is usually placed on the side of the backlight module, and the light emitted by the light source is guided to the display panel by means of a light guide plate.

Direct-type backlight modules are usually used in products that require high brightness, such as televisions. As shown in FIG. There is a reflective coating capable of light reflection, or a layer of reflective film 12 is attached to reflect the light source; then a plurality of light sources 13 are arranged at intervals in sequence, and a diffusion plate 14 is arranged above the light source 13, and then the diffusion plate One or more light-diffusing films 15 and one or more brightness-enhancing films 16 are disposed above 14 and finally combined with a display panel 17 to form a thin film transistor liquid crystal display (TFT-LCD).

In addition, since the role of optical diffusion components such as diffusion plates or diffusion sheets is only to diffuse the passing light uniformly, the effect on improving the bright and dark bands of the liquid crystal module is limited. Therefore, some backlight modules deliberately elongate the light source 12 and the diffusion. The gap between the plates 13 is expected to expand the range where each light source 12 enters the diffuser plate 13 and achieve the purpose of reducing the dark zone; however, such a structural design not only has a limited effect, but also increases the thickness of the backlight module, which is different from the thinness of the liquid crystal module. contrary to the original design intent.

The manufacture of existing optical diffusion components can be divided into two types: one is to form a microstructure for diffusion on the surface of the substrate; the other is to coat the microparticles on the surface of the substrate, or mix the microstructure blended into the substrate. The microparticle coating method often cannot achieve high uniformity and high process yield, and the amount of particle coating is limited, so the diffusion rate cannot be improved, and at the same time, it is easy to scratch other components. The microparticle mixing method can increase the diffusivity, but the light transmittance is low.

The microstructure formed on the surface of the substrate is mainly of two types: irregular undulating ground glass structure and regular microlens structure (lens array). Among them, the frosted glass structure is the light diffusion structure used in the early days, but its diffusion rate is low, and the diffusion direction is also random, so it cannot be diffused in a specific direction for fluorescent tubes. The columnar microlens structure can effectively control the direction of light diffusion. The existing designs include continuous circular arc, sinusoidal waveform, triangle, square, etc., such as disclosed in US Patent Publication US2003/0184993A1 and Japanese Patent Laid-Open No. 2000-75102 In US2003/0184993A1, the lens group microstructure is applied to a direct-lit backlight module of a liquid crystal display to achieve a diffusion effect. JP 2000-75102 applies the sinusoidal wave lens to the design of the light collecting plate. Wherein with the design of the continuous circular arc above semicircle has optimal light diffusibility as shown in Figure 2A, B (arrow represents the light beam of incident), the columnar microlens 18 of sinusoidal waveform or the columnar microlens of other wave forms The effect of uniformly dispersing the light source cannot be achieved; therefore, the structures of the above-mentioned various optical diffusion components are used to solve the obvious bright and dark bands in the conventional backlight module, and there is still room for further improvement.

Utility model content

In view of this, the purpose of the present invention is to provide an optical diffuser used in a backlight module, which can increase the amount of light between each light source and improve the luminance of the whole backlight module.

The technical solution of the optical diffusion component of the utility model is as follows: the optical diffusion component is mainly provided with a plate body, and a plurality of light sources are arranged on one side of the plate body, so that the light emitted by the light source is evenly diffused through the optical diffusion component; wherein, The plate body contains a plurality of optical microstructures with long and short axes, and the long axis direction of each optical microstructure is slightly parallel to the extending direction of the light source.

Since the curvature of the short axis is greater than that of the long axis, the diffusion effect in the long axis direction is worse than that in the short axis direction, and the long axis direction of each optical microstructure is slightly parallel to the extending direction of the light source, or each optical microstructure The short axis direction of the microstructure is slightly perpendicular to the extending direction of the light source, so that each light source can get a better diffusion effect through the short axis of the optical microstructure, and the amount of light between each light source can be increased to eliminate the dimness between each light source Band area to improve the luminance of the overall backlight module.

The beneficial effects of the utility model are:

1. The optical microstructure has long and short axes, which produce different diffusion effects and can effectively distribute light from the light source.

2. The long axis direction of each optical microstructure is slightly parallel to the extending direction of the light source, or the short axis direction of each optical microstructure is slightly perpendicular to the extending direction of the light source, so that each light source passes through the short length of the optical microstructure. A better diffusion effect can be obtained by the axis, so that the light quantity between each light source can be increased, so as to eliminate the dark zone between each light source, so as to improve the luminance of the whole backlight module.

3. When the optical diffusion component is applied to a 3D stereoscopic display, the optical diffusion component is placed between the first and second liquid crystal panels, which can improve the conventional 3D stereoscopic display to produce moire, and visually produce bright and dark Disadvantages of water ripple.

Description of drawings

FIG. 1 is a schematic structural diagram of a general direct-lit backlight module;

2A and B are structural diagrams of conventional optical diffusion components;

Fig. 3 is a perspective view of the structure of the optical diffusion assembly and the light source in the utility model;

4 is a schematic structural view of the first embodiment of the optical diffusion assembly in the present invention;

Fig. 5 is a schematic structural view of the A-A direction in Fig. 3;

6 is a schematic structural view of the second embodiment of the optical diffusion assembly in the present invention;

Fig. 7 is a schematic structural view of the third embodiment of the optical diffusion assembly in the present invention;

Fig. 8 is a schematic structural view of the fourth embodiment of the optical diffusion assembly in the present invention;

Fig. 9 is a schematic structural view of the fifth embodiment of the optical diffusion assembly in the present invention;

FIG. 10 is a perspective view of the structure of the optical diffusion component applied to the backlight module in the present invention.

【Description of figure number】

Light P1 Long axis light output P2

Short axis light output P3 Direct type backlight module 1

Housing 11 Reflective film 12

Light source 13 Diffuser plate 14

Light diffusion film 15 Brightness enhancement film 16

Display panel 17 Cylindrical microlens 18

Optical diffusion component 2 board body 21

Light-incoming surface 211 Light-emitting surface 212

Optical Microstructure 22 Major Axis 221

Minor axis 222 light source 3

Extending direction 31 The first LCD panel 4

Second LCD panel 5

Detailed ways

In order to make your examiner understand the structure and composition of the utility model, as well as the overall operation mode, it is described as follows with the drawings:

The optical diffusion assembly of the present utility model, as shown in Figure 3, the optical diffusion assembly 2 is mainly provided with a plate body 21, the plate body 21 is provided with a light incident surface 211 and a light exit surface 212 opposite to the light incident surface 211, and the plurality of light sources 3 is arranged under the light incident surface 211 on one side of the plate body 21, so that the light emitted by the light source 3 can be evenly diffused through the optical diffusion component 2.

The key point of this case is: the plate body 21 includes a plurality of optical microstructures 22 with long and short axes. Please also refer to the first embodiment shown in FIG. The projection of the optical microstructure 22 on the light-emitting surface 212 can be elliptical. Please also refer to the structure of each optical microstructure 22 shown in FIG. The direction is roughly parallel to the extending direction 31 of the light source 3 .

When used as a whole, since the curvature of the minor axis 222 is greater than the curvature of the major axis 221, the diffusion effect in the direction of the major axis 221 is poorer than that of the minor axis 222. Please also refer to FIG. The direction of the long axis 221 is slightly parallel to the extension direction 31 of the light source 3, so that when the light P1 of the light source 3 (assuming that the light quantity is 100%) enters the optical microstructure 22, a poor diffusion effect is obtained through the long axis 221 (if the long axis The light output P2 is 40%), then a better diffusion effect is obtained through the short axis 222 (then the short axis light output P3 is 60%), that is, the light output obtained toward the extension direction 31 of the light source 3 is relatively low, and The amount of light emitted toward each light source 3 is higher, so that the amount of light between each light source can be increased, so as to eliminate the dark zone between each light source, so as to improve the brightness of the overall backlight module.

In the second embodiment shown in FIG. 6 , a plurality of optical microstructures 22 arranged randomly are also arranged on the light-emitting surface 212 of the plate body 21, and each optical microstructure 22 is an elliptical hemispherical structure with a length Axis 221 and short axis 222, the direction of the long axis 221 is slightly parallel to the extension direction 31 of the light source 3, and there are densely arranged optical microstructures 22 relative to the top of the light source 3; moreover, each optical microstructure 22 can also be It is a long columnar structure, as shown in the third embodiment shown in FIG. 7 .

In the fourth embodiment shown in Fig. 8, a plurality of optical microstructures 22 arranged randomly are also arranged on the light-emitting surface 212 of the plate body 21, and each optical microstructure 22 is a rhombic columnar structure with a long axis 221 and the minor axis 222 , the direction of the minor axis 222 is roughly perpendicular to the extending direction 31 of the light source 3 .

In the fifth embodiment shown in FIG. 9 , a plurality of optical microstructures 22 are also arranged on the light-emitting surface 212 of the plate body 21 , each optical microstructure 22 protrudes from the surface of the light-emitting surface 212 , and can be further placed on the plate body 21 A plurality of optical microstructures 22 are disposed on the light incident surface 211 , and each optical microstructure 22 is recessed on the surface of the light incident surface 211 .

As shown in Figure 10, it is a three-dimensional view of the structure of the optical diffusion component used in the backlight module of the present invention. A first liquid crystal panel 4 is arranged between the light source 3 and the optical diffusion component 2, and a second liquid crystal panel is arranged above the optical diffusion component 2. The panel 5 is a 3D stereoscopic display with stereoscopic image performance. The light emitting surface 212 of the optical diffusion component 2 is also provided with a plurality of optical microstructures 22, which can improve the existing 3D stereoscopic display. It will have the disadvantage of bright and dark water ripples.

Therefore, the utility model has the following advantages compared to the conventional ones:

1. The optical microstructure has long and short axes, which produce different diffusion effects and can effectively distribute light from the light source.

2. The long axis direction of each optical microstructure is slightly parallel to the extending direction of the light source, or the short axis direction of each optical microstructure is slightly perpendicular to the extending direction of the light source, so that each light source passes through the short length of the optical microstructure. A better diffusion effect can be obtained by the axis, so that the light quantity between each light source can be increased, so as to eliminate the dark zone between each light source, so as to improve the luminance of the whole backlight module.

3. When the optical diffusion component is applied to a 3D stereoscopic display, the optical diffusion component is placed between the first and second liquid crystal panels, which can improve the conventional 3D stereoscopic display to produce moire, and visually produce bright and dark Disadvantages of water ripple.

As mentioned above, the utility model provides another preferable and feasible optical diffusion component, and an application for a new patent is submitted according to law; however, as shown in the above description and drawings, the preferred embodiment of the utility model is not based on This limitation of the utility model, therefore, all those similar and identical to the structure, device, and features of the utility model, all should belong to the creation purpose of the utility model and within the scope of the patent application.

Claims (7)

1. An optical diffusion component, the optical diffusion component is mainly provided with a plate body, and a plurality of light sources are arranged on one side of the plate body; it is characterized in that: The board contains a plurality of optical microstructures with long and short axes, and the long axis direction of each optical microstructure is slightly parallel to the extending direction of the light source, or the short axis direction of each optical microstructure is slightly aligned with the extending direction of the light source. Orthogonal arrangement. 2. The optical diffusion assembly according to claim 1, wherein the plate body is provided with a light incident surface and a light exit surface opposite to the light incident surface, and each optical microstructure is arranged on the light exit surface. 3. The optical diffusion assembly according to claim 1, wherein the plate body is provided with a light incident surface and a light exit surface opposite to the light incident surface, a plurality of light sources are arranged below the light incident surface, and each optical microstructure is arranged on The light-emitting surface has more densely arranged optical microstructures than the light source. 4. The optical diffusion assembly according to claim 2, wherein the projection of each optical microstructure on the light-emitting surface is elliptical. 5. The optical diffusion assembly according to claim 1, wherein each optical microstructure is an elliptical hemispherical, rhombic columnar or elongated columnar structure. 6. The optical diffusion assembly according to claim 1, wherein the plate body is provided with a light incident surface and a light exit surface opposite to the light incident surface, a plurality of light sources are arranged below the light incident surface, and each optical microstructure is arranged on On the light emitting surface, a first liquid crystal panel is arranged between the light source and the optical diffusion assembly, and a second liquid crystal panel is arranged above the optical diffusion assembly. 7. The optical diffusion assembly according to claim 2, 3 or 6, wherein each optical microstructure is further arranged on the light incident surface.

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