JP2011048187A - Microstructural diffusion plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microstructural diffusion plate simultaneously provided with two kinds of optical effects of a spectral effect and a light diffusion effect. <P>SOLUTION: The microstructural diffusion plate includes: a substrate having a light incident surface and a light exit surface; and a plurality of microstructural parts covering the light exit surface. The plurality of microstructural parts include a first microstructural unit and a second microstructural unit. The first microstructural unit includes: a first side face; a second side face; a tip face; a first spacing; a second spacing; and a height. The first side face and the second side face correspond to a first gradient and a second gradient; 1/2≤2H/(P1-P2)/2≤9/5. The second microstructural unit has a curve functional shape, the second microstructural unit and the second side face of the first microstructural unit form a first low point, and the second microstructural unit and the first side face of the other first microstructural unit form a second low point. The first side face and the second side face of the first microstructural unit receive the light from a light source, so as to form a first optical path, the tip face of the first microstructural unit receives the light from a light source, so as to form a second optical path, and the second microstructural unit receives the light from the light source, so as to form a third optical path. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a microstructure diffusing plate, and particularly to a microstructure diffusing plate having a plurality of optical structures.

  At present, a new generation display device such as a liquid crystal display has already been actively researched and developed and is gradually entering the market. However, since the liquid crystal itself does not emit light, the function of the backlight module provides a light source with sufficient luminance and even distribution, thereby enabling normal display of images. The basic principle of the backlight module is to convert a frequently used spot or line light source into a surface light source having uniform and high brightness using a simple and effective light mechanism. In general, in the structure of a direct type backlight module, a linear light source such as a cold cathode tube is used to pass through a reflective mask, so that the light equalizing action of the diffusion plate and the prism sheet The brightness and uniformity of the light source can be increased by the light collecting action.

  Currently, diffuser technology is constantly evolving, and its main purpose is to achieve beam equalization. For example, US Pat. No. 6,606,133 discloses a diffusion plate having an optical structure on the entire light exit surface and light entrance surface (see FIG. 1). (Illustrated). The diffusing plate 1A has a main body 2A, one surface of the main body 2A is a light incident surface, the other surface facing the light incident surface is a light exit surface, and a prism ( prism) structure 3A is formed, and a plurality of convex structures 4A are formed on the light incident surface. However, in the general manufacturing process, the manufacturing process for forming the optical structures on both sides is highly difficult, the acceptance rate of the finished product is low, and a problem occurs when assembling the optical film. In addition, U.S. Pat. No. 7,255,456 discloses two types of optical structures formed on the light exit surface of the diffuser. The two types of optical structures are prisms and lenticulars, respectively. This diffusion plate has the following drawbacks. 1. Each of the two types of optical structures has only a single optical effect. That is, the prism has only a spectral effect, and the lenticular has only a light diffusion effect. For this reason, the effect of equalization which can be achieved by the combination of both is low. 2. Since the prism has a pointed point due to its structure, when assembled with another optical film, the other optical film is scratched and the reliability of the product is lowered. 3. When a pointed structure is formed at the time of production, the production pass rate of the diffusion plate is low, or it is difficult to mold the diffusion plate.

  In other words, the conventional diffuser plate cannot effectively increase the uniformity of light rays, and there are other problems such as few combinations and low yield during molding. It makes it difficult to further spread the use. The present inventor considers that there is room for improvement of the above-mentioned drawbacks, and proposes the present invention that can rationally improve the above-mentioned disadvantages with a reasonable design.

US Pat. No. 6,606,133 US Pat. No. 7,255,456

  The main object of the present invention is to provide a microstructure diffuser. By providing two or more different optical structures on the microstructure diffusing plate, a single optical structure has two types of optical effects simultaneously, namely a spectral effect and a light diffusing effect. It is to be able to provide light with excellent uniformity.

In order to achieve the above-mentioned object, the present invention provides a microstructure diffusion plate that includes a light incident surface and a light output surface, the light incident surface receiving a light beam of a light source. The microstructure diffusing plate includes a plurality of microstructures that cover the light exit surface, and the plurality of microstructures includes a first microstructure unit (optical structure) and a second microstructure unit (optical structure). The first microstructure unit includes a first side surface, a second side surface, a top surface, a first interval (P1), a second interval (P2), and a height (H), and the first side surface and the The second side surface corresponds to the first inclination and the second inclination, respectively, and the first side surface and the second side surface are respectively located on both sides of the top surface and spaced apart from the second surface. The first side surface and the second side surface are respectively located on both sides of the light exit surface and are spaced apart from each other, and from the top surface to the light entrance surface, the height is increased, where The first slope and the second slope are calculated by the following formula: 1/2 ≦ 2H / (P1-P2) / 2 ≦ 9/5; The second microstructure unit has a curved function shape and is located on the light exit surface; the second microstructure unit and the first microstructure unit are adjacent to each other; and the second microstructure unit is The structural unit and the second side surface of the first microstructure unit form a first low point, and the second microstructure unit and the first side surface of the other first microstructure unit are second Forming a low point, the first low point and the second low point are located on the light exit surface;
When the plurality of microstructures receive light from the light source, the first side surface and the second side of the first microstructure unit receive the light from the light source to form a first optical path, The top surface of the first microstructure unit receives a light beam from the light source to form a second optical path, and the second microstructure unit receives a light beam from the light source to form a third optical path.

  The present invention further discloses a microstructure diffusing plate including a light incident surface and a light output surface, wherein the light incident surface receives light from a light source. The microstructure diffusing plate includes a plurality of microstructures that cover the light exit surface, and the plurality of microstructures includes a first microstructure unit (optical structure) and a second microstructure unit (optical structure). The first microstructure unit includes a first side surface, a second side surface, a top surface, a first interval (P1), a second interval (P2), and a height (H), and the first side surface and the The second side surface corresponds to the first inclination and the second inclination, respectively, and the first side surface and the second side surface are respectively located on both sides of the top surface and spaced apart from the second surface. The first side surface and the second side surface are respectively located on both sides of the light exit surface and are spaced apart from each other, and from the top surface to the light entrance surface, the height is increased, where The first slope and the second slope are calculated by the following formula: 1/2 ≦ 2H / (P1-P2) / 2 ≦ 9/5; The second microstructure unit includes a third side surface, a fourth side surface, and a second top surface, and the third side surface and the fourth side surface correspond to a third inclination degree and a fourth inclination degree, respectively. And the third side surface and the fourth side surface are respectively located on both sides of the second top surface, and the second microstructure unit and the first microstructure unit are adjacent to each other, and The third side surface of the second microstructure unit and the second side surface of the first microstructure unit form a first low point, and the fourth side surface of the second microstructure unit and the other first surface. The first side surface of the microstructure unit forms a second low point, and the first low point and the second low point are located on the light exit surface, wherein the plurality of microstructure portions are When receiving the light beam of the light source, the first side surface and the second side surface of the first microstructure unit have a first optical path. The third side surface and the fourth side surface of the second microstructure unit receive a light beam from the light source to form a second optical path, and the first top surface of the first microstructure unit is , Receiving a light beam from the light source to form a third optical path, and the second top surface of the second microstructure unit receives a light beam from the light source to form a fourth optical path.

  The present invention further provides a backlight module using the above-described microstructure diffuser.

  The present invention has the following beneficial effects. The optical structure of the microstructure diffusion plate presented by the present invention can have both a light diffusion effect and a spectral effect. For example, spectroscopy is performed on the side surface of the optical structure having a structure resembling a trapezoidal shape in cross section or side view, and light diffusion is performed on the top surface. Further, by combining two or more different types of optical structures at the same time, it is possible to achieve an extremely excellent light equalizing effect.

It is the schematic of the diffusion plate structure of a prior art. It is the schematic of Example 1 of the microstructure diffuser plate of this invention. FIG. 3 is an enlarged view of a portion A in FIG. 2. 2 is a schematic diagram of a second embodiment in Example 1. FIG. 3 is a schematic diagram of a third embodiment in Example 1. FIG. It is the schematic of Example 2 of the microstructure diffuser plate structure of this invention. FIG. 4 is an enlarged view of a portion B in FIG. 3. 6 is a schematic view of a second embodiment in Example 2. FIG. 1 is a schematic diagram of a one-dimensional structure of Example 1. FIG. 1 is a schematic diagram of a two-dimensional structure of Example 1. FIG. 3 is a schematic diagram of a two-dimensional structure of Example 2. FIG. It is the structure schematic of the microstructure diffusion plate of this invention. It is an optical simulation figure of the light emission uniformity of the microstructure diffusion plate of the present invention and the conventional diffusion plate. It is the schematic of the backlight module using the microstructure diffuser plate of Example 1. FIG. It is the schematic of the backlight module using the microstructure diffuser plate of Example 2. FIG.

  For a better understanding of the features and technical contents of the present invention, reference will now be made to the detailed description of the invention and the accompanying drawings. However, the attached drawings are only provided for reference and explanation and do not impose any limitations on the present invention.

  The present invention provides a microstructure diffusion plate 1. Two or more optical structures having different structures are provided on the microstructure diffusing plate 1, thereby achieving a diffusing effect with good light beam uniformity. 2, 2A, 2B, and 2C are the first embodiment of the present invention. The microstructure diffusing plate 1 includes a light incident surface 100 and a light output surface 101, and the light incident surface 100 receives a light beam (arrow in FIG. 2) of a light source. A feature of the present invention is that by forming a plurality of microstructures 120 on the light exit surface 101, first microstructure units (optical structures) 121 and second microstructure units (optical) that are alternately and repeatedly arranged. Structure) 122, and these two optical structures are structures having different contour forms, so that different optical effects can be produced with respect to incident light rays, and the light incident surface 100 Is a simple flat surface, so that the molding pass rate can be increased. In the present embodiment, the first microstructure unit 121 has a structure resembling a trapezoid in a cross-sectional or side view (hereinafter, simply referred to as “a structure resembling a trapezoid”), and the first microstructure unit 121 121 has a first side surface 1211A, a second side surface 1211B, and a top surface 1212A, and the above-described structure can define the first interval P1, the second interval P2, and the height H. The first side surface 1211A and the second side surface 1211B are positioned on both sides of the top surface 1212A, respectively, and the first side surface 1211A and the second side surface 1211B are respectively set to a first inclination and a second inclination. Correspondingly, the second distance P2 is the distance between the first side surface 1211A and the second side surface 1211B, and the first distance P1 is the distance between the first side surface and the second side surface. One distance, the first interval P1 is the maximum pitch between the two, and the second interval P2 is the minimum pitch between the two. In addition, the height H is a distance from the top surface 1212A to the light incident surface 100. Furthermore, based on the above-described structure, the first inclination and the second inclination satisfy the following formula: 1/2 ≦ 2H / (P1-P2) / 2 ≦ 9/5: In the backlight module 3 using the structural diffusion plate 1, a more excellent light emission mode can be obtained.

  In addition, the second microstructure unit 122 has a shape in which the outer edge of the outer surface is represented by a curve function (hereinafter, simply referred to as “curve function shape”) in a cross-sectional or side view, and Located on the light exit surface 101. The second microstructure unit 122 and the first microstructure unit 121 are adjacent to each other, and both are alternately and repeatedly arranged. The second microstructure unit 122 and the second side surface 1211B of the first microstructure unit 121 form a first low point 131, and the second microstructure unit 122 and another first microstructure unit. The first side surface 1211 </ b> A of 121 forms a second low point 132, and the first low point 131 and the second low point 132 are located on the light exit surface 101.

  When the plurality of microstructures 120 receive the light beam of the light source, the first side surface 1211A and the second side surface 1211B of the first microstructure unit 121 receive the light beam of the light source 30 and receive the first optical path. The top surface 1212A of the first microstructure unit 121 receives light from the light source 30 to form a second optical path, and the second microstructure unit 122 receives light from the light source 30. A third optical path is formed.

  In a specific example, the second microstructure unit 122 has a shape in which the outer edge of the second microstructure unit 122 is represented by a conic curve (hereinafter, simply referred to as “conical curve shape”). This is the structure. The second microstructure unit 122 is a segment of a conic curve shape whose outer edge in a cross-section or side view of the outer surface satisfies a circular, elliptical, or parabolic equation, for example, and the conic coefficient of the conic curve is , Less than or equal to −1 (≦), and the optical structure having the contour of this conical curve can exhibit the light diffusion effect of light rays.

  In addition, the outer edge of the top surface 1212A of the first microstructure unit 121 in a cross-sectional or side view (hereinafter simply referred to as “the outer edge of the top surface”) is a curved line (shown in FIG. 2A) or a straight line (see FIG. 2B), the two optical structures having the two different types of structures described above can exhibit the spectral effect and the light diffusion effect at the same time with respect to the light beam emitted from the light exit surface 101. Note that in FIG. 2A, the two optical structures have the same maximum pitch P (ie, both have the same pitch), and the maximum pitch P is in the range of approximately 40 μm to 850 μm. . In other words, a first pitch P is formed between the first low point 131 and the second low point 132, and between the second low point 132 and another first low point 131. , A second pitch (that is, corresponding to the first interval P1 described above) is formed, and the first pitch and the second pitch are equal (P = P1). On the other hand, the two optical structures are most preferably a structure having the same height, but a height difference can be provided between the two optical structures, and the difference in height does not exceed 50%. Is preferred. For example, if the height of the first microstructure unit 121 is 1, the height of the second microstructure unit 122 is set in a range of approximately 0.5 to 1.5, so that the optical structure is The pass rate of the manufacturing process to be molded can be maintained.

  As shown in FIG. 2B, in terms of light rays, the top surface 1212A has a light diffusing effect (ie, the second optical path), and the two first and second side surfaces 1211A and 1211B on the left and right sides are spectrally separated. In order to be effective (ie, the first optical path), the first microstructure unit 121 has two types of optical characteristics, and is not only capable of only one of spectroscopy and light diffusion. Regarding the light intensity, the spectral intensity of the first and second side surfaces 1211A and 1211B is greater than the diffused light intensity of the top surface 1212A. For example, assuming that the intensity of incident light is 100, the spectral intensity is 51 and the diffused light intensity is 49. However, it is not limited to this. Further, the second microstructure unit 122 exhibits a light diffusion effect (that is, the third optical path).

  As shown in FIG. 2A, in terms of light rays, the curved top surface 1212A similarly has a light diffusing effect (ie, a second optical path) and has two first and second side surfaces on its left and right sides. 1211A and 1211B have a spectral effect (that is, the first optical path). Similarly, regarding the light intensity, the spectral intensity of the first and second side surfaces 1211A and 1211B is larger than the diffused light intensity of the top surface 1212A. For this reason, in the above-described two types of embodiments, two different types of optical structures are formed on the light exit surface 101, and the first microstructure unit 121 having a structure resembling a trapezoid is included. By combining the second microstructure unit 122 having a light diffusing effect (that is, a third optical path), it is possible to simultaneously have two types of optical effects, that is, a spectral effect and a light diffusing effect. The structural diffuser plate 1 can efficiently equalize incident light and output (emits) light beams having high uniformity. FIG. 2C is a third embodiment in Example 1 of the present invention, and this embodiment is a modification of FIG. 2A. In the microstructure diffusing plate 1 of the third embodiment, the third microstructure unit 123 arranged repeatedly is further formed on the light exit surface 101. Here, the third microstructure unit 123 is the same as the first microstructure unit 121 in FIG. 2B, and uses the combination of the above-mentioned three different optical structures, so The degree of uniformity can be increased.

  3 to 3B are a second embodiment of the present invention. The difference from the first embodiment is that in this embodiment, two or more types of optical structures are provided on the light exit surface 101 of the microstructure diffusion plate 1 at different pitches (Pitch). Hereinafter, various embodiments of the present embodiment will be described in detail. First, as shown in FIG. 3A, in a specific embodiment of the present invention, the first microstructure unit 121 ′ and the second microstructure unit 122 ′ are both similar to trapezoids, The first microstructure unit 121 ′ has a first side surface 1211A ′, a second side surface 1211B ′, and a first top surface 1212A ′, and the above-described structure has a first interval P1, a second interval P2, and a height H. The first side surface 1211A ′ and the second side surface 1211B ′ are respectively located on both sides of the top surface 1212A ′, and the first side surface 1211A ′ and the second side surface 1211B ′ are The second inclination P2 corresponds to a first inclination and a second inclination, respectively, and the second interval P2 is a distance between the first side surface 1211A ′ and the second side surface 1211B ′, and the first interval P1 is The first side surface 1211A ′ Is another of the distance between the second side surface 1211B '. In this embodiment, the first interval P1 is the maximum pitch between the two, and the second interval P2 is the minimum pitch between the two. In addition, the height H is a distance from the top surface 1212A ′ to the light incident surface 100. Further, based on the above-described structure, the first inclination and the second inclination are expressed by the following formula: By satisfying / 2 ≦ 2H / (P1−P2) / 2 ≦ 9/5 :, the backlight module 3 using the microstructure diffuser plate 1 can obtain a more excellent light emission mode. Similarly, the second microstructure unit 122 ′ has a third side surface 1221A ′, a fourth side surface 1221B ′, and a second top surface 1222A ′, and the third side surface 1221A ′ and the fourth side surface 1221B ′. Respectively correspond to the third and fourth inclinations, and the third side surface 1221A ′ and the fourth side surface 1221B ′ are respectively located on both sides of the second top surface 1222A ′. The second microstructure unit 122 ′ and the first microstructure unit 121 ′ are adjacent and alternately arranged repeatedly, and the third side surface 1221A ′ of the second microstructure unit 122 ′ and the first The second side surface 1211B 'of the microstructure unit 121' forms a first low point 131 ', and the fourth side surface 1221B' of the second microstructure unit 122 'and another first microstructure unit. The first side surface 1211A ′ of 121 ′ forms a second low point 132 ′, and the first low point 131 ′ and the second low point 132 ′ are located on the light exit surface 101. When the plurality of microstructures 120 ′ receive the light from the light source 30, the first side surface 1211A ′ and the second side surface 1211B ′ of the first microstructure unit 121 ′ form a first optical path. The third side surface 1221A ′ and the fourth side surface 1221B ′ of the second microstructure unit 122 ′ receive a light beam from the light source 30 to form a second optical path, and the first microstructure unit 121 ′. The first top surface 1212A ′ receives the light from the light source 30 to form a third optical path, and the second top surface 1222A ′ of the second microstructure unit 122 ′ receives the light from the light source 30. And a fourth optical path is formed.

  The difference between the first microstructure unit 121 ′ and the second microstructure unit 122 ′ is that they have different maximum pitches. In a specific embodiment of the present invention, the second microstructure unit 122 ′ forms the second side surface 1211 B ′ of the first microstructure unit 121 ′ and the first low point 131 ′. The first side surface 1211A ′ of the first microstructure unit 121 ′ and the second low point 132 ′ are formed. A first pitch P is formed between the first low point 131 'and the second low point 132', and between the second low point 132 'and another first low point 131'. Forms the second pitch P1, and the first pitch and the second pitch are not equal. In other words, a first pitch P is formed between the first low point 131 'and the second low point 132', and the second low point 132 'and another first low point 131'. A second pitch (corresponding to the first interval P1 described above) is formed between the first pitch P and the first pitch P such that, for example, P is 350 μm and P1 is 300 μm. It is not the same as the two pitch P1 (that is, P ≠ P1). However, the range of the above-mentioned first pitch and second pitch is the same as that of the first embodiment, and is approximately in the range of 40 μm to 850 μm. The present embodiment uses a structure similar to the trapezoid having the two different maximum pitches described above, and similarly, the side surface can exhibit the spectral effect and the top surface can exhibit the light diffusion effect, and thereby the fine structure. The diffusing plate 1 can output (emits) a light beam having better uniformity. The first microstructure unit 121 ′ may have a conical curve shape. In this case, the conic coefficient of the conic curve is less than or equal to −1 (≦).

  FIG. 3B shows a second embodiment in the present embodiment. Here, the difference from FIG. 3A is that the outer edge of the top surface 1212A ′ of the first microstructure unit 121 ′ is a curve, and the curvature radius of the curve is the first radius of the first microstructure unit 121 ′. The outer edge of the top surface 1222A ′ of the second microstructure unit 122 ′ is also a curve that is less than or equal to the interval P1 (≦), and the radius of curvature of the curve is the same as that of the second microstructure unit 122 ′. Less than or equal to (≦) the maximum pitch (corresponding to the first pitch P described above) between the third side surface 1221A ′ and the fourth side surface 1221B ′. Similarly, the side surface has a spectral effect and the top surface has light diffusion. By demonstrating the effect, the microstructure diffusing plate 1 can output a light beam having high uniformity. In other words, the outer edge of the top surface 1222A 'of the second microstructure unit 122' can be curved or straight, and the outer edge of the top surface 1212A 'of the first microstructure unit 121' can also be curved or straight. Can be straight.

  In addition, according to the present invention, a third optical structure can be formed on the light exit surface 101. For example, the third optical structure can be an optical structure having a third maximum pitch, or the outer edge of the top surface of the optical structure can be a curved line or a straight line. A light beam having a high degree of uniformity is provided by using the above-described optical structure that can simultaneously exhibit the light diffusion effect. Other features of the present embodiment are the same as those of the first embodiment, and are not described again here.

  On the other hand, the above-described structure can be changed in consideration of optical design. As shown in FIG. 4, when the microstructure diffusing plate 1 of the present invention is used for a fluorescent lamp or the like such as CCLF, the first microstructure unit 121, the second microstructure unit 122 or the first in the first embodiment described above. The three microstructure unit 123 is formed on the light exit surface 101 as a structure extending in a one-dimensional direction (one-dimensional structure), that is, as a linear structure (FIG. 4 shows the first microstructure unit 121 and Only the second microstructure unit 122 is drawn). When the microstructure diffuser plate 1 is used for a light emitting diode or the like, the optical structure described above is a structure (two-dimensional structure) scattered in a two-dimensional direction arranged alternately and repeatedly on the light-emitting surface 101, that is, When a matrix-like structure is constructed and the two-dimensional structure is used, the optical structure is a convex structure (FIG. 5 is a two-dimensional structure formed by using the convex structure of the optical structure of Example 1). ) Or a concave structure (FIG. 5A is a two-dimensional structure in which the optical structure of Example 2 is formed using concave parts). In other words, the microstructure diffuser plate 1 can change the above-described optical structure accordingly in different usage situations, and at the same time achieve light output (emission) with a good equal effect. it can. Similarly, the microstructure diffusing plate 1 in other embodiments can achieve the purpose of generating an equalized light beam by changing to a one-dimensional structure or a two-dimensional structure.

  FIG. 6 shows the internal composition and structure of the microstructure diffuser plate 1 of the present invention. The microstructure diffusion plate 1 shown in FIG. 6 includes a main layer 10, a bottom layer 11 installed below the main layer 10, and a microstructure layer 12 installed above the main layer 10, and has a layer shape. It has a sandwich structure. In the present embodiment, the main layer 10 is made of polystyrene (Polystyrene, PS) or polycarbonate (Polycarbonate, PC), and the main layer 10 has diffused particles 20 that can further equalize light rays. Is most preferably included. The bottom layer 11 and the microstructure layer 12 are respectively disposed below and above the main layer 10 and may be made of polystyrene (polystyrene, PS) or methyl methacrylate styrene (methyl methacrylate styrene). Further, the bottom layer 11 and the microstructure layer 12 may further include ultraviolet light absorbing particles 21 so as to absorb ultraviolet light in the light source itself or in the external light, thereby allowing microstructure diffusion. The problem that yellowing (yellowing) occurs in the plate 1 can be prevented. In addition, the above-described optical structure is formed on the surface of the microstructure layer 12 (that is, the light exit surface 101), but the number of layers constituting the above-described material or the microstructure diffuser plate 1 will be described. It is only used and does not limit the present invention.

  In addition, FIG. 7 is a result of optical simulation of the light uniformity performed by the present invention on the microstructure diffuser plate of the prior art and the microstructure diffuser plate 1 of the present invention. In this result diagram, each curve represents the distribution of light intensity along the cross-section lateral direction. Curve 1 represents the distribution of light intensity when two CCFL light sources are used and no diffuser is used. As can be seen from the above, the two CCFLs are installed at positions of approximately 40 millimeters (mm) and 80 millimeters (mm), so that the light intensity is concentrated at the two positions and away from the two positions. The light intensity dropped significantly and the light was not equalized. A curve 2 represents the distribution of light intensity when a diffuser plate in which a pointed prism is installed on the two light sources is used. However, the curve 2 clearly has wave crests and wave bottoms in the distribution of light intensity, and the uniformity is not ideal. Curve 3 shows the case of using a composite structural diffuser plate (that is, US Pat. No. 7,255,456 referred to in the prior art) in which a pointed prism and a lenticular are installed on the two light sources. The light intensity changes according to the distance from the CCFL light source, and the light intensity varies greatly. Curves 4 and 5 represent the distribution of light intensity when the microstructure diffuser plate 1 of Example 1 and Example 2 of the present invention is used. As can be seen from the small variation in light intensity, the microstructure diffuser plate 1 presented by the present invention can greatly increase the uniformity of light rays. That is, the light intensity is not affected by the position of the CCFL light source, and maintains a very high uniformity. Therefore, it can be said that the microstructure diffusing plate 1 of the present invention can output (emits) a light beam having a higher degree of uniformity than the conventional diffusing plate.

  Further, based on the above-described light intensity experiment, the present invention can provide a light beam with a very high degree of uniformity. Therefore, in practical use, the microstructure diffuser plate 1 presented by the present invention is different. By combining with a diffusion plate, it can be used for the final product. In comparison, since the conventional diffusion plate can not be used in the product without combining three diffusion plates, the present invention, from the viewpoint of either the effect of equalization or the production cost, It has superior performance compared to conventional diffusion plates.

  8 and 8A show the backlight module 3 of the microstructure diffuser plate 1 presented by the present invention. FIG. 8 shows the backlight module 3 using the microstructure diffuser plate 1 of the first embodiment, and FIG. 8A shows the backlight module 3 using the microstructure diffuser plate 1 of the second embodiment. The backlight module 3 includes at least one light source 30 and the microstructure diffusion plate 1 described above. The microstructure diffusion plate 1 is installed above the light source 30 and the light source 30 is formed by a reflection structure 31. By further installing in the space, a light beam with higher brightness can be generated. The light source 30 is a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED), a flat fluorescent lamp (FFL), an external electrode fluorescent lamp (EEFL), a hot cathode fluorescent lamp (HCFL), or other types of light sources. You can also The features of the microstructure diffusing plate 1 are the same as those in the previous embodiment, and will not be described here again.

  As described above, the present invention has the following advantages. It has an excellent light equalizing action, and the optical structure described above can simultaneously have a light diffusion effect and a spectral effect. For this reason, for example, spectroscopy can be performed on the side surface of the optical structure similar to a trapezoid, and light diffusion can be performed on the top surface. Moreover, the problem of interference fringes can be reduced by simultaneously combining two or more different types of optical structures. Thereby, the microstructure diffuser plate of the present invention can obtain an extremely excellent light equalization effect. On the other hand, the microstructure diffusing plate structure presented by the present invention can output (emit) a light beam with extremely high uniformity. For this reason, when used in combination with other optical films, the number of other films can be reduced. For example, the conventional diffusion plate required the use of three diffusion plates, but the microstructure diffusion plate of the present invention requires only two diffusion plates. In other words, the microstructure diffuser plate of the present invention can effectively reduce the manufacturing cost of the final product (for example, a display), and thus can increase the use value of the microstructure diffuser plate of the present invention. In addition, a prism is installed on a conventional diffusion plate, and the prism has a pointed structure. This structure is an optical film installed above the diffusion plate. Cause problems such as scratches or damage due to friction. On the contrary, since the top surface of the structure of the present invention is a flat surface or a curved surface, the problem caused by the prism structure can be solved.

  The above is the description of the embodiments of the present invention and does not limit the claims of the present invention. All modifications having the same effect by applying the specification of the present invention and the accompanying drawings are intended to be included in the claims of the present invention.

1A Diffuser 2A Main body 3A Prism structure 4A Convex structure 1 Microstructure diffuser 10 Main layer 100 Light incident surface 101 Light exit surface 11 Bottom layer 12 Microstructure layer 120, 120 'Microstructure portion 121, 121' First microstructure Units 1211A, 1211A ′ First side surface 1211B, 1211B ′ Second side surface 1212A, 1212A ′ Top surface 122, 122 ′ Second microstructure unit 1221A ′ Third side surface 1221B ′ Fourth side surface 1222A ′ Second top surface 123 Third minute Structural unit 131, 131 '1st low point 132, 132' 2nd low point 20 Diffusion particle 21 Ultraviolet light absorption particle 3 Backlight module 30 Light source 31 Reflective structure P1 1st space | interval P2 2nd space | interval P 2nd pitch

Claims (10)

A microstructure diffusing plate including a light incident surface and a light exit surface, wherein the light incident surface receives a light beam of a light source,
The microstructure diffuser plate includes a plurality of microstructure portions covering the light exit surface,
The plurality of microstructures include a first microstructure unit and a second microstructure unit, wherein the first microstructure unit includes a first side surface, a second side surface, a top surface, a first interval (P1), a second Including the interval (P2) and the height (H), the first side surface and the second side surface correspond to a first inclination and a second inclination, respectively, and the first side and the second side Are located on both sides of the top surface and spaced apart from each other, and the first side surface and the second side surface are located on both sides of the light exit surface and spaced apart from each other, and From the top surface to the light incident surface, leave the height,
Here, the first inclination and the second inclination satisfy the following formula: 1/2 ≦ 2H / (P1-P2) / 2 ≦ 9/5;
The second microstructure unit has a curved function shape and is positioned on the light exit surface, the second microstructure unit and the first microstructure unit are adjacent to each other, and the second microstructure unit And the second side surface of the first microstructure unit forms a first low point, and the second microstructure unit and another first side surface of the first microstructure unit are second low points. And the first low point and the second low point are located on the light exit surface,
When the plurality of microstructures receive light from the light source, the first side surface and the second side of the first microstructure unit receive the light from the light source to form a first optical path, The top surface of the first microstructure unit receives a light beam from the light source to form a second optical path, and the second microstructure unit receives a light beam from the light source to form a third optical path. A micro-structure diffusion plate that is characterized.   2. The microstructure diffusion plate according to claim 1, wherein the second microstructure unit has a conical curve shape, and a cone coefficient of the cone curve is less than or equal to −1 (≦). , Microstructure diffuser.   2. The microstructure diffusion plate according to claim 1, wherein the top surfaces of the first microstructure units are all convex portions or concave portions.   2. The microstructure diffusion plate according to claim 1, wherein the second microstructure unit forms the second side surface of the first microstructure unit and the first low point, and is another first microstructure. Forming a first side surface of the unit and the second low point, and forming a first pitch between the first low point and the second low point, the second low point and another first low point; A microstructure diffusion plate, wherein a second pitch is formed between points, and the first pitch and the second pitch are not equal.   The microstructure diffusion plate according to claim 1, wherein an outer edge of the top surface of the first microstructure unit is a curve or a straight line. A microstructure diffusing plate including a light incident surface and a light exit surface, wherein the light incident surface receives a light beam of a light source,
The microstructure diffuser plate includes a plurality of microstructure portions covering the light exit surface,
The plurality of microstructures include a first microstructure unit and a second microstructure unit, wherein the first microstructure unit includes a first side surface, a second side surface, a top surface, a first interval (P1), a second Including the interval (P2) and the height (H), the first side surface and the second side surface correspond to a first inclination and a second inclination, respectively, and the first side and the second side Are located on both sides of the top surface and spaced apart from each other, and the first side surface and the second side surface are located on both sides of the light exit surface and spaced apart from each other, and From the top surface to the light incident surface, leave the height,
Here, the first inclination and the second inclination satisfy the following formula: 1/2 ≦ 2H / (P1−P2) / 2 ≦ 9/5;
The second microstructure unit includes a third side surface, a fourth side surface, and a second top surface, and the third side surface and the fourth side surface correspond to a third inclination degree and a fourth inclination degree, respectively. The third side surface and the fourth side surface are respectively located on both sides of the second top surface, the second microstructure unit and the first microstructure unit are adjacent to each other, and the second side surface The third side surface of the microstructure unit and the second side surface of the first microstructure unit form a first low point, and the fourth side surface of the second microstructure unit and another first microstructure. The first side surface of the unit forms a second low point, and the first low point and the second low point are located on the light exit surface,
Here, when the plurality of microstructures receive light from the light source, the first side surface and the second side surface of the first microstructure unit form a first optical path, and the second microstructure The third side surface and the fourth side surface of the unit receive a light beam of the light source to form a second optical path, and the first top surface of the first microstructure unit receives a light beam of the light source. The microstructure diffusion plate, wherein a third optical path is formed, and the second top surface of the second microstructure unit receives a light beam from the light source to form a fourth optical path.   7. The microstructure diffusion plate according to claim 6, wherein the second microstructure unit forms the second side surface of the first microstructure unit and the first low point, and the other first microstructure. Forming a first side surface of the unit and the second low point, and forming a first pitch between the first low point and the second low point, the second low point and another first low point; A microstructure diffusion plate, wherein a second pitch is formed between points, and the first pitch and the second pitch are not equal.   The microstructure diffusion plate according to claim 6, wherein the first microstructure unit and the second microstructure unit are all convex portions or concave portions.   The microstructure diffusion plate according to claim 6, wherein the first microstructure unit has a conical curve shape, and a cone coefficient of the cone curve is less than or equal to −1 (≦). , Microstructure diffuser.   The microstructure diffusion plate according to claim 6, wherein an outer edge of the top surface of the second microstructure unit is a curve or a straight line.

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