TWM325505U - Condenser lens - Google Patents

Description

M325505 (1) VIII. New description [New technical field] This creation is about a concentrating sheet, especially a light diffusing concentrating sheet that can be applied to a backlight module in a liquid crystal display. [Prior Art]

In general, a liquid crystal display ("LCD") backlight module, as shown in FIG. 1, is mainly composed of an upper diffusion sheet 1 1 , a condensing sheet (horizontal) 12 , a condensing sheet (vertical) 13 , and a lower portion. The diffusion sheet 14, the light guide plate 15, the reflection film 16, the cold cathode tube 17, the bulb reflector 18, the outer frame 19, and the like, however, as the LCD becomes larger, the relative cost is higher and higher. 'As a result, more and more panel makers are beginning to profit from lowering costs, and the backlight module factory is also focusing on this trend, starting to evaluate the reduction of optical diaphragms in backlight module structures, according to US Patent No. 675 9 1 1 3 and 70903 89B2 disclose different concentrating structures, as shown in Figures 2 and 3, which have a two-dimensional concentrating function to concentrate horizontal and vertical light into a desired viewing angle. In order to replace the two diamond lenses, the construction of the concentrating unit is too complicated, and the mold opening cost is relatively increased, which is disadvantageous for reducing the mass production cost of the concentrating sheet. This creation uses a novel optical film to replace the combination of the concentrating sheet and the diffusing film to achieve the same light uniformity under cost savings. [New content] One of the aims of this creation is to provide a light distribution that is more uniform. -4- (2) M325505 concentrating sheet, which has the characteristics of concentrating sheet and diffusing film, which can replace the combination of conventional concentrating sheet and diffusing film to achieve the same light uniformity and meet the low-cost market demand. . Another purpose of this creation is to design concentrating sheets with different concentrating structures according to requirements, which can effectively eliminate ripples or the like, so that the creation has the effect of improving optical display characteristics.

In order to achieve the above object, a concentrating sheet disclosed in the present invention comprises a substrate comprising an upper surface and a bottom surface; a plurality of concentrating units disposed on the upper surface of the substrate to form an array, the poly The light unit is composed of a microstructure of a regular or irregular semi-capsule pattern; a non-smooth surface diffusion layer is disposed on the bottom surface of the substrate. [Embodiment] The concentrating sheet 40 of the present invention, as shown in FIG. 4, comprises a substrate 41 having an upper surface 42 and a bottom surface 43. The upper surface φ 42 of the substrate 41 is composed of a plurality of poly The light units comprise an array consisting of a microstructure of a regular or irregular semi-capsule 42 1 for refracting, the distribution of the incident light such that the distribution of light exiting the concentrating sheet Within a desired perspective. The semi-capsule pattern 421 refers to a microstructure having a shape similar to that of a medical capsule, and the surface thereof is smoothly curved. According to a preferred embodiment of the present invention, the semi-capsule pattern is as shown in Fig. 5. The concentrating sheet 40 combines the characteristics of the conventional concentrating sheet and the diffusing film, and the light from the light source is firstly condensed and then condensed. As shown in FIG. 4, the bottom surface 43 of the substrate is a non- a smooth surface diffusion layer, which is a diffusion layer having diffusion particles 431, (3) M325505, which can uniformly diffuse light from the light source, and then collect the light to gather the light in a condensing unit of a semi-capsule pattern 42 1 . Light effect.

The substrate 4 1 described above can be known to those of ordinary skill in the art to which the present invention pertains, such as glass or plastic. The above plastic substrate is not particularly limited, and is not limited to, for example, but not limited to, a polyester resin such as polyethylene terephthalate (PET): a polyacrylate resin such as polymethacrylic acid. Ester (PMMA); polyolefin resin, such as polyethylene (PE) or polypropylene (PP); polyimide resin: polycarbonate resin: polyaminocarboxylic acid Polyurethane resin; cellulose triacetate (TAC); or a mixture thereof. It is preferably a polyester resin or a polycarbonate resin, more preferably polyethylene terephthalate. The thickness of the substrate typically depends on the desired optical product requirements, preferably between about 50 μπι (micrometers) and about 150 μπι. In addition to the non-smooth surface diffusion layer of the present invention, the light from the light source can be diffused, and the generation of static electricity can be reduced to avoid adsorption of foreign matter during operation. The method of forming the non-smooth surface diffusion layer is not particularly limited and is well known to those skilled in the art, such as, but not limited to, screen printing, coating, spraying, embossing, and the like. Preferably, the surface of the substrate is coated with a coating layer having diffusion particles having a thickness of from 1 to 50 μm, and the above diffusion particles may be an fluorenone resin or an acrylic resin. In order to achieve the light concentrating effect, the present invention comprises an array of a plurality of concentrating units on the surface of the substrate 41, and the concentrating unit is composed of a microstructure of the semi-capsular 421. Preferably, the concentrating unit is -6 - (4) M325505 has a semi-capsule pattern 42 1 of the same height and length. This type of concentrating unit has better light collecting and diffusing effects, so The liquid crystal display is provided with enhanced brightness and light uniformity.

The concentrating unit of the present invention has a refractive index of 1.3 to 2.0, and the forming method is not particularly limited, and is well known to those skilled in the art, and is, for example, but not limited to, coating a substrate containing a resin, a photoinitiator, and crosslinking. Formed from the composition of the agent. Suitable resins are well known to those skilled in the art and are, for example, but not limited to, polyester resins, polyacrylate resins or polycarbonate resins. The photoinitiator to be used in the present invention is not particularly limited, and is a radical which is generated by light irradiation, and which is caused by the transfer of a radical, such as benzophenone. Suitable crosslinking agents are, for example, (meth) acrylates having one or more functional groups, preferably those having a polyfunctional group, to increase the glass transition temperature. The above-mentioned concentrating layer may be added with any conventional additives such as an inorganic mash, a leveling agent, an antifoaming agent or an antistatic agent. The tools used can be manufactured by existing extrusion, etching or laser engraving methods. Basically, the master tool is made of diamond turning technology on a roller, and its surface material is made of hard copper, stainless steel or hard chrome. In a preferred embodiment, the semi-capsule pattern is produced by laser engraving, and the depth, vertical and horizontal angles of the engraving can be independently controlled, and the arrangement of the patterns is not particularly limited. The arrangement of the rules, the smoothness of the surface can be achieved by honing, uranium engraving or electrolytic polishing. 6 is a preferred embodiment of the present concentrating sheet 40, wherein (5) M325505, as shown in FIG. 6, the upper surface 42 of the substrate 41 is composed of an array of a plurality of concentrating units. The light unit is composed of a microstructure of a regular semi-capsule pattern 421, that is, the microstructure of the semi-capsule pattern 42 1 has the same height and length, and the arrangement of the light collecting unit is regular. The bottom surface 43 of the substrate is a non-smooth surface diffusion layer, wherein the diffusion layer is coated on the surface of the substrate 41 with a coating having diffusion particles 431.

FIG. 7 is another embodiment of the present concentrating sheet 40, wherein, as shown in FIG. 7, the upper surface 42 of the substrate 41 is composed of a plurality of concentrating units, and the concentrating unit has The microstructure of the half capsular pattern 42 1 of different heights or lengths is formed, and the arrangement of the concentrating units is regular. The bottom surface 43 of the substrate is a non-smooth surface diffusion layer, wherein the diffusion layer is coated on the surface of the substrate 41 with a coating having diffusion particles 431. The concentrating sheet of the present invention can be used in a backlight module of a liquid crystal display. The composite concentrating sheet of the present invention has both light diffusion and concentrating effects. Figures 8 and 9 utilize the TracePro optical film pseudo-software to simulate the result of light passing through the semi-capsule pattern; first, the light is passed through the opposite surface of the substrate. The diffusion layer and the refractive index of different media produce light deflection and then use the change in the microstructure to produce the effect of diffusion and concentrating, so that the light can be evenly distributed at the center position, and the effect of the concentrating film has been achieved. The above embodiments are intended to further illustrate the present invention and are not intended to limit the scope of the present invention. Modifications and variations that are readily apparent to those skilled in the art are included within the scope of the disclosure and the scope of the appended claims. (6) (6) M325505 [Simple description of the diagram] Figure 1 shows the structure of a conventional backlight module. Figure 2 is a view showing the structure of a condensing sheet disclosed in U.S. Patent No. 6,759,113. Fig. 3 is a view showing the structure of a condensing sheet disclosed in U.S. Patent No. 7,903,892 B2. Figure 4 is a side view of the concentrating sheet of the present invention. Figure 5 is a perspective view of the semi-capsule pattern of the present invention. Figure 6 is a preferred embodiment of one of the concentrating sheets of the present invention. Fig. 7 is another embodiment of the concentrating sheet of the present invention. Fig. 8 is a simulation diagram of light uniformity of the composite concentrating sheet of the present invention. Figure 9 is a perspective view of the composite concentrating sheet of the present invention. Ti required component symbol description] 1 1 : upper diffusion sheet 12 : concentrating sheet (horizontal) 13 : concentrating sheet (vertical) 1 4 : lower diffusion sheet 1 5 : light guide plate 1 6 : reflective film 1 7 : cold cathode tube 1 8 : Lamp reflector 19 : Outer frame 40 : Condenser 41 : Substrate 42 · Upper surface -9- (7) M325505 421 : Semi-capsule pattern 43 : Bottom surface 431 : Diffusion particles

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Claims (1)

(1) (1) M325505 IX. Patent Application Range 1. A concentrating sheet comprising a substrate comprising an upper surface and a bottom surface; a plurality of concentrating units disposed on an upper surface of the substrate to form an array, the concentrating unit It is composed of a regular or irregular semi-capsule microstructure; a non-smooth surface diffusion layer is disposed on the bottom surface of the substrate. 2. The concentrating sheet of claim 1, wherein the microstructure is composed of a semi-capsule pattern having the same height or length. 3. The concentrating sheet of claim 1, wherein the microstructure is composed of a semi-capsule pattern having different heights or lengths. 4. For the concentrating sheet of claim 1, wherein the concentrating unit is arranged in a regular manner. 5. The concentrating sheet of claim 1, wherein the concentrating unit is arranged irregularly. 6. The concentrating sheet of claim 1, wherein the diffusion layer is a diffusion layer having diffusion particles. 7. The concentrating sheet of claim 1, wherein the concentrating unit has a refractive index of from 1.3 to 2.0. -11 -