CN201269483Y - Composite optical diaphragm with light gathering and diffusion functions - Google Patents

Abstract

The utility model discloses a composite optical diaphragm with both light gathering and diffusion, the optical diaphragm is mainly provided with a substrate, the substrate is provided with an upper surface and a lower surface which are oppositely arranged, and the upper surface is provided with a plurality of microstructures; the length of the major axis and the minor axis of each microstructure is 20-50 μm, and the height is 10-35 μm, and the luminance value of the composite optical film can be increased by about 12-20% compared with the luminance value of a high luminance diffusion film used in the general industry according to the actual test result per square meter, the total linear light transmittance is 55-60%, and the haze is 85-90%, so that the composite optical film has the functions of improving the optical luminance and increasing the light utilization rate.

Description

Concentrating and diffusing composite optical film

technical field

The utility model is a composite optical diaphragm with both light concentrating and diffusion, especially an optical diaphragm used in a backlight module, which can reduce the number of diaphragms used, reduce costs, and has the advantages of improving optical luminance and increasing light. function of utilization.

Background technique

Press, currently in the flat panel display, mainly includes TFT-LCD display, PDP plasma display and rear projection display. As Japanese, Korean and Taiwanese manufacturers are actively investing in the development of TFT-LCD liquid crystal displays and adopting large-scale production equipment, the quality of liquid crystal displays is constantly improving, and the price is also falling, which drives the demand for liquid crystal displays, so that TFT-LCD displays Become the current mainstream of flat panel displays.

The LCD panel itself cannot emit light, and a backlight module is needed to provide the light source for the display. Generally speaking, the backlight of the LCD display is mainly of the direct type, and the direct type backlight can be increased by adding lamps, or using a diffuser Diffusion sheets are used to meet the brightness requirements of large-size liquid crystal displays; among them, the diffusion sheets are divided into internal expansion type and surface diffusion type. The internal diffusion type is to disperse optical particles with different refractive indexes in an acrylic resin plate to reflect the light uniformly. The adjustment of degree unevenness; and the surface diffusion type uses a transparent resin plate to roughen the surface to reflect and refract light.

Please refer to China Taiwan Patent Announcement No. M266466 "Structure of Light Diffusion Plate for Increased Brightness", which discloses the structure of the conventional direct-type backlight module. Generally, the structure of the direct-type module includes a reflector, a plurality of light sources, A light diffusion sheet, a first prism sheet, a second prism sheet, a light diffusion film, etc. At present, in the backlight module, the common brightening technology is to match one or two prism sheets with different directions. The emission angle allows the light diffused through the diffuser to be concentrated again, and reduces the light loss rate, thereby achieving the purpose of increasing brightness. The prism sheet is generally made of PET polyester or polycarbonate material with a thickness of 75-230 μm. On the surface of the sheet, a strip-shaped prism array with a pitch of 24-110 μm and an apex angle of 90-110 degrees is formed. Because of its optical structure As well as the refractive index, it has the effect of concentrating light. When using a right-angled prism sheet, the front brightness can be improved by more than 1.6 times, and if two vertically arranged prism sheets are used, the front brightness can be improved by more than 2 times; for related patents, please refer to US Patent No. 5175030 , No. 5183597, No. 6280063, No. 6277471, and No. 5592332, all of which further describe the brightening and diffusion technology.

However, the right-angled vertex on the surface of the prism sheet is very easy to be damaged by accidental collision during manufacture and transportation, and damage to any part of the prism sheet will cause major defects such as bright spots on the display panel, which cannot be used by users. Accepted, and the manufacturing yield is low, which also caused great troubles to the manufacturers; therefore, there is another conventional method to flatten or round the corners at the tip of the corners, so that the corners are less likely to be damaged. Thereby improving the production yield, but this method will greatly reduce the light-gathering effect of the prism sheet, and cannot provide a backlight with sufficient brightness; Or a combination of two light-enhancing plates to achieve the purpose of light-increasing and diffusion at the same time, it is impossible to integrate them together, and the manufacturing cost is also greatly increased.

Utility model content

The technical problem solved by the utility model is to provide an optical film used in a backlight module, which can reduce the number of films used, reduce the cost, and has the functions of improving optical brightness and increasing light utilization rate.

In order to achieve the above purpose, the optical film of the present utility model is mainly provided with a base material, the base material is provided with upper and lower surfaces oppositely arranged, and the upper surface is provided with a plurality of microstructures; wherein each microstructure has an arc-shaped surface, Moreover, the length of the major axis and the minor axis of the microstructure is between 20 μm and 50 μm, and the height is between 10 μm and 35 μm. According to the actual test results per square meter, the luminance value of this composite optical film can be compared with the high luminance used in the general industry. The brightness of the diffuser film increases by about 12% to 20%, the overall light transmittance is in the range of 55% to 60%, and the haze is in the range of 85% to 90%, so as to improve the optical brightness and increase the light utilization rate. Function.

The beneficial effects of the utility model are:

1. The application of the optical film in the backlight module can reduce the number of films used, reduce the cost, and has the functions of uniform light and increased light utilization.

2. According to the actual test results per square meter, the luminance value of this optical film can be increased by about 1.2% to 20% compared with the high luminance diffusion film used in the general industry, and the overall light transmittance is 55% to 60%. The range of haze is 85% to 90%. If it is higher or lower than this range, the luminance value will decrease.

3. The microstructure distribution ratio per unit area of the optical film is more than 92%, so that the overall light uniformity is 80%-92%.

Description of drawings

Fig. 1 is the structural perspective view of the first embodiment of the optical film in the utility model;

Fig. 2 is the enlarged structural representation of microstructure in the utility model;

Fig. 3 is the structural representation of the first embodiment of the optical film in the utility model;

Fig. 4 is the structural representation of the second embodiment of the optical film in the utility model;

Fig. 5 is the structural representation of the third embodiment of the optical film in the utility model;

Fig. 6 is the structural representation of the fourth embodiment of the optical film in the utility model;

Fig. 7 is a schematic structural view of the fifth embodiment of the optical film in the present invention;

Fig. 8 is a schematic structural view of the sixth embodiment of the optical film in the present invention;

Fig. 9 is a schematic structural view of the seventh embodiment of the optical film in the present invention;

Fig. 10 is a structural schematic diagram of the application of the optical film in the utility model to the side-light backlight module;

FIG. 11 is a schematic diagram of the structure of the optical film applied to the direct type backlight module in the present invention.

【Description of figure number】

Long axis L Short axis W

Height H Optical film 1

Upper surface 111 Lower surface 112

Microstructures 12 Curved Surfaces 121

Antistatic Adhesive Layer 13 Diffusion Particles 14

Grace layer 15 Vehicle 21

Light source device 22 Light source 221

Light guide plate 23

Detailed ways

In order to allow the above-mentioned purposes, functional features, and advantages of the utility model to be more clearly understood, the utility model will be described in detail as follows with preferred examples and accompanying drawings:

The utility model has both concentrating and diffusing composite optical membranes and a backlight module. The optical membrane 1 is shown in the first embodiment of FIG. Upper and lower surfaces 111, 112, the upper surface 111 is provided with a plurality of microstructures 12, the distribution ratio of each microstructure 12 can be more than 92%, wherein each microstructure 12 has an arc-shaped surface 121, and each microstructure 12 protrudes (or Concave) the upper surface 111, and the curvature of each microstructure arc surface 121 can be between 0.015 ~ 0.025, please refer to Fig. 2 and Fig. 3 at the same time, and the long axis L and short axis of the microstructure 12 The length of W is between 20 μm and 50 μm, and the height H is between 10 μm and 35 μm; of course, the substrate 11 can be further provided with an antistatic adhesive layer 13, as shown in the second embodiment of FIG. 4 , the antistatic adhesive layer 13 is disposed on the lower surface 112 of the substrate 11; in addition, a plurality of microstructures 12 may be further disposed on the lower surface 112 of the substrate 11, as shown in the third embodiment of FIG. 5 .

Furthermore, a plurality of diffusion particles can also be provided in the above-mentioned embodiments and/or in the antistatic adhesive layer. Taking the second embodiment as an example, the upper and lower surfaces 111 of the substrate are provided with a plurality of microstructures 12, and the lower surface 112 Then be provided with an antistatic adhesion layer 13, as shown in the fourth embodiment of Fig. 6, be provided with plural diffusion particles 14 in each microstructure 12 and antistatic adhesion layer 13, this diffusion particle 14 can be spherical (also can be non- Spherical), the diffusion particles 14 are selected from but not limited to PU, PS, PMMA, nylon, silica gel, and the average particle diameter of the diffusion particles 14 can be 0.1nm to 1000nm, and each diffusion particle 14 is partially embedded or convexly embedded in the The microstructure 12 and the antistatic adhesive layer 13 can further increase the diffusion ability of the optical film through the arrangement of the diffusion particles 14; of course, the diffusion particles can also be hollow spherical or non-spherical structures made of polymer materials , as shown in the fifth embodiment of FIG. 7, the diffusing particle 14 is a hollow spherical structure made of a polymer material, and the diffusing particle 14 is made of two materials with different refractive indices. If light passes through the diffusing particle 14 When , four light refraction paths will be formed to make the passing light more uniform.

In addition, the arrangement of the microstructures 12 can be arranged in parallel, adjacent and discontinuous manner along the long axis direction as shown in FIG. 1, or as shown in the sixth embodiment of FIG. 12 are arranged vertically, adjacently and discontinuously along the major axis direction.

Of course, in addition to adding diffusion particles in the above-mentioned embodiments to increase the diffusion energy, it is also possible to add a light-enhancing layer on the optical film to achieve the effect of brightening. As shown in the seventh embodiment of Figure 9, the bottom of the substrate The surface 112 is further provided with a light enhancement layer 15, and the light enhancement layer 15 is provided with a plurality of prism structures 151 for increasing the brightness of the optical film.

The optical film of the present invention can be applied to a backlight module. As shown in FIG. 10, the utility model is applied to a side-light type backlight module. The light plate 23 and at least one optical film 1, the carrier 21 can be used to carry the light source 22 or the structure of the optical film 1, the light source device 22 includes at least one light source 221 and is installed on the side of the carrier 21, and the guide The light plate 23 is arranged on the side of the light source device 22, the optical film 1 is arranged on the carrier 21 and above the light guide plate 23, the structure of the optical film 1 can be the structure described in the above-mentioned embodiments, and This figure takes the first embodiment as an example; as shown in Figure 11, the optical film of the present invention can also be applied to a direct-type backlight module, and the backlight module 2 also at least includes; a carrier 21, a light source device 22 , a light guide plate 23 and at least one optical film 1, the light source device 22 is installed above the carrier 21, and the light guide plate 23 and the optical film 1 are sequentially arranged above the light source device 22; of course, depending on the needs Increase the number of optical films, and each optical film can be in the same form or in different forms, for example, each optical film can be a microstructure with a convex surface or a concave surface, or can be provided with a convex surface and a concave surface. The microstructure on the surface, or at least one light enhancing film and/or diffusion film (not shown in the figure) is further provided on the optical film to increase the brightness and/or light diffusion effect of the backlight module.

The optical diaphragm of the present invention has the following advantages compared with the conventional ones:

1. The application of the optical film in the backlight module can reduce the number of films used, reduce the cost, and has the functions of uniform light and increased light utilization.

2. According to the actual test results per square meter, the luminance value of this optical film can be increased by about 12% to 20% compared with the high luminance diffusion film used in the general industry, and the overall light transmittance is 55% to 60%. The range of haze is 85% to 90%. If it is higher or lower than this range, the luminance value will decrease.

3. The microstructure distribution ratio per unit area of the optical film is more than 92%, so that the overall light uniformity is 80%-92%.

As mentioned above, the utility model provides a more feasible composite optical film with light concentrating and diffusing, so the application for a new patent is filed according to law; The new preferred embodiment is not to limit the utility model with this, therefore, all similar and identical ones with the structure, device, and features of the utility model should all belong to the creation purpose of the utility model and within the scope of the patent application.

Claims (10)

1, a kind of optically focused and diffusion composite optical diaphragm of having concurrently, this blooming piece mainly is provided with a base material, and this base material is provided with the upper and lower surface that is oppositely arranged, and this upper surface is provided with plural micro-structural; It is characterized in that:

Each micro-structural has curved surfaces, and the major axis of this micro-structural and minor axis length be between 20 μ m～50 μ m, and highly then between 10 μ m～35 μ m, and all fronts light transmittance of this blooming piece is 55%～60%, and mist degree is 85%～90%.

2, have optically focused and diffusion composite optical diaphragm according to claim 1 concurrently, it is characterized in that the lower surface of this base material further is provided with plural micro-structural.

3, have optically focused and diffusion composite optical diaphragm as claimed in claim 1 or 2 concurrently, it is characterized in that, further be provided with plural diffusion particle in each micro-structural.

4, as described in claim 3, have optically focused and diffusion composite optical diaphragm concurrently, it is characterized in that micro-structural is partly buried or be convexly set in to each diffusion particle underground.

5, as described in claim 3, have optically focused and diffusion composite optical diaphragm concurrently, it is characterized in that this diffusion particle is the hollow structure that macromolecular material constituted.

6, as described in claim 2, have optically focused and diffusion composite optical diaphragm concurrently, it is characterized in that each micro-structural is arranged in mode parallel to each other, adjacent and discontinuous along long axis direction, perhaps each micro-structural is along long axis direction, be perpendicular to one another, adjacent and discontinuous mode arranges.

7, have optically focused and diffusion composite optical diaphragm according to claim 1 concurrently, it is characterized in that this base material further is provided with an antistatic adhesive layer, this antistatic adhesive layer is arranged at the lower surface of this base material.

8, have optically focused and diffusion composite optical diaphragm according to claim 1 concurrently, it is characterized in that the lower surface of this base material further is provided with a lustre adding layer.

9, as described in claim 8, have optically focused and diffusion composite optical diaphragm concurrently, it is characterized in that this lustre adding layer is provided with plural prism structure.

10, have optically focused and diffusion composite optical diaphragm according to claim 1 concurrently, it is characterized in that, each micro-structural is protruded or recessed this upper surface.

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