TW526371B - Reflection plate, reflective polarizing plate and liquid crystal display device - Google Patents

Abstract

The present invention provides a reflection plate and a reflective polarizing plate for bringing about a liquid crystal display device having bright display and superior visibility, and further to provide the liquid crystal display device using the reflective polarizing plate. To achieve the object, the provided reflection plate is characterized in that the reflection surface consists of a projecting and recessing stripe shaped curved surface which has smaller than 500 μm pitch and more than 80 DEG and less than 180 DEG angle, and the recessed curve between adjacent vertexes is not a real arc. Also, a reflective polarizing plate is formed by a laminated polarizing plate on the reflective surface side of the reflective plate, and a liquid crystal display device is formed by arranging liquid crystal cells on the polarizing layer side of the reflective polarizing plate.

Description

526371 A7 B7 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a reflective plate, a reflective polarizing plate, and a liquid crystal display device [Known Technology] Liquid crystal display devices are used in notebook-type word processors, Notebook computers, electronic notebooks, personal digital assistants, entertainment devices, mobile phones, and more. Many of these portable devices use so-called reflective liquid crystal display devices, which are formed by laminating a first polarizing plate, a liquid crystal cell (ce11), a polarizing plate, and a reflecting plate in this order. As the liquid crystal lattice (c e 11) herein, for example, a twisted nematic (T N, T w s t e d n e m a t i c) type, a super twisted turn (S T N, Super Twistednematic) type, a guest host (G H, Guest host) type, and the like are used. In addition, as a reflective plate, if a semi-transmissive reflective plate having light transmittance is used, an illumination device (backlight) arranged on the back side of the reflective plate can illuminate the display screen, whether at night or in a dark place. be usable. As a reflecting plate, it is known that its triangular columns have a shape arranged adjacent to each other in the ridgeline direction; for a cross section perpendicular to the ridgeline of the triangular column, the triangles formed by the triangular columns are arranged in a zigzag manner with each other; and the elevation angle of each triangle It is 2.5 ° or more, and at least a part of the reflecting surface is a flat reflecting plate (W 0 97/0 5 5 2 1). However, for a liquid crystal display device using a conventional reflecting plate, the outermost surface, that is, from the perspective of leaving light reflected from the first polarizing plate, brightness or visibility may not be sufficient, and it is hoped that it can be further improved . (Please read the precautions on the back before filling this page) · · · Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Cooperatives This paper is printed in accordance with China National Standard (CNS) A4 (210 X 297 mm) -4- 526371 A7 _______ B7 V. Description of the invention (2) [Questions to be solved by the invention] Therefore, the object of the present invention is to provide a liquid crystal display device with bright display and excellent visibility; further, a liquid crystal display device used in the liquid crystal display device is provided. Reflector and reflective polarizer. The inventor of the present invention, in order to develop a reflective plate that makes the liquid crystal display device display bright and has good visibility, and through the bursting results, it is found that the reflection surface is made to have unevenness with a pitch of 5 0 0 // m or less The streak-shaped specific curved surface can obtain an excellent effect, and the present invention has been developed. [Means used to solve the problem] That is, the present invention provides a reflecting plate, which is characterized in that: the reflecting surface is a concave-convex stripe curved surface having a pitch of 5 0 0 // m or less; The angle between two straight lines connecting the bottom of the valley and the two adjacent tops is between 80 ° and 180 °; and the concave curve between the adjacent tops is not a true arc. The invention provides a method for manufacturing a reflective plate, which is characterized in that: a surface of a substrate is coated with a hardening resin solution, dried and hardened, and then a metal layer is formed; the substrate has a triangular column arranged at a ridge line; Shapes that are adjacent to each other; for a cross section perpendicular to the ridge line of the triangular column, the triangles formed by the triangular columns are arranged in a zigzag pattern with each other; and the surface of each triangle has an elevation angle of 2.5 ° or more. According to need, use this combination of reflecting plate and polarizing layer -------------- Shang --- (Please read the note on the back? Matters before filling this page) Order : Printed by the Consumers 'Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper is printed to the Chinese National Standard (CNS) A4 (210 X 297 public love) -5- 526371 A7 __ _ B7 Printed by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (3) 'It is possible to manufacture a liquid crystal display device that is bright and has good visibility even when viewed from the perspective of exposure to external light. Therefore, according to the present invention, it is also possible to provide a reflective polarizing plate in which the above-mentioned reflecting plate and polarizing layer are combined, and further to provide a liquid crystal display device including these reflective plate or reflective polarizing layer and a liquid crystal lattice. [Embodiment of the present invention] First, the structure of the reflecting plate of the present invention, particularly the structure of the reflecting surface, will be described with reference to the drawings. Figures 1 and 2 are cross-sectional views of an example of a typical surface of a reflective plate that is not specified in the present invention; the dotted lines in the figure represent the surface of a substrate. P, A, B, and C 'in FIG. 2 indicate the valley bottom B and the adjacent tops A and C existing at a pitch P in the vertical section of the ridge line of the stripe-like uneven surface. Fig. 3 is a perspective view schematically showing an example of a base material suitable for producing a reflecting plate of the present invention. Fig. 4 is a perspective view schematically showing another example of the base material. 5 and 6 are distribution curves of the relationship between the amount of reflected light and the angle of the reflection plate obtained in the first and second embodiments described later, respectively. The reflection plate of the present invention, as shown in FIG. 2, has a surface with an uneven streak surface having a pitch (P) of less than 5 0 // m; for a section perpendicular to a ridge line , The lowest part connecting the bottom of the valley B ^) and the two straight lines A and C adjacent to the top two angles ZABC is 80 ° ~ 180 °. This ZABC is ideally 100 ° ~ 178 °. If the ZABC is less than 80 °, sufficient brightness cannot be obtained. --------------- Packing --- (Please read the precautions on the back before filling this page) Order ·· -Line · 0 This paper size applies to China National Standard (CNS) A4 Specifications (210 X 297 mm) -6- 526371 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Invention Description 4 (4) In addition, in the section perpendicular to the ridge line of the stripe-like uneven surface, the curve ABC Not a real arc. In other words, a part of the circumference is not formed. Although the curve A B C may be symmetrical or asymmetric based on the bottom of the valley, it does not include a straight line. This is because the curve improves the scattering characteristics of the reflected light more than the straight part. In the reflective plate of the present invention, a hardened film (protective film) is usually provided on the surface of the substrate, and a metal layer is further provided on the film to form the aforementioned stripe-shaped uneven surface. In addition, such a reflecting plate having a stripe-shaped uneven surface has a triangular prism having a specific shape of a base material having a surface aligned in a shape adjacent to the ridge line direction, and a hardened film and a metal film are sequentially formed on the surface. , This kind of reflector can be manufactured. For example, as shown by the dashed lines in FIGS. 1 and 2, a surface of a base material whose triangular column has a surface arranged in a shape adjacent to the ridge line is coated with a hardening resin solution and dried and hardened. The coating is hardened, and if a metal layer is formed on the coating, a curved surface shown by a solid line in the same figure can be obtained. Further, for example, a flat plate-shaped substrate can be formed by using a female mold roller having a curved surface shape of the reflective surface of the present invention, and a method of forming unevenness by roller transfer, etc., to produce a reflective plate having the same surface shape. To further explain the form of a hardened film and a metal layer on a base material whose triangular prisms have a surface arranged adjacent to each other in the ridge line direction, the base material is a cross-section of the triangular prism perpendicular to the ridge line of the triangular prism. The triangles formed are arranged in a zigzag pattern. The elevation angle of this triangle, that is, the angle between the hypotenuse and the bottom of the triangle, is more than 2 · 5 °; this paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ^ ---- ------------- Line (Please read the precautions on the back before filling out this page) 526371 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. A7 B7 V. Invention Description (5) Ideally 2.5 ° ~ 90 °, more preferably 2.5 ° ~ 50 °, and even more preferably 2.5. ~ 15. . An example of a substrate satisfying this condition is shown in Figs. 3 and 4. For such a reflector substrate, the top of the triangle may form an acute angle or may be rounded. Of course, the top of the triangle can also be an obtuse angle, which can be further rounded. Moreover, the hypotenuse of the triangle need not be a standard straight line. The triangle pitch in the cross section of the base material of such a reflection plate, that is, the length of the bottom of the triangle, although there is no particular limitation, it is considered that it is easy to obtain a regular shape or make the line inconspicuous. The ideal is 5 0 0 // m Hereinafter, it is particularly preferable to be in a range of 10 to 5 0 0. If the length of the bottom edge is less than 1 0 // m, it is difficult to obtain a regular shape. On the contrary, if the length of the bottom edge is more than 5 0 0 // m, the line is easy to be prominent. When the reflecting plate of the present invention is assembled in a liquid crystal display device, the pixel pitch of the liquid crystal cell and the triangle pitch of the reflecting plate interfere with each other to generate moire. To prevent such ripples, the following countermeasures are ideal. (1) Make the pixel pitch of the liquid crystal cell the same as the pitch of the triangle of the reflector, (2) Make the lengths of the bottom sides of adjacent triangles different, or (3) Make the pitch of the triangle at 1 〇〇 # m or less. The material of the base material may be, for example, polyethylene terephthalate, polyester, polycarbonate, acrylic resin, plastic such as polyolefin (hydrocarbon), glass, and the like. The thickness of the substrate (except for the height of the unevenness in the reflector) ’Although it is not particularly limited, it is approximately 1 〇 # m ~ 5 1ΊΊ 1ΊΊ (Please read the precautions on the back before filling in this page)

This paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) -8-526371 Printed by A7 B7, Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of invention (6); It may be plate-shaped. Such a substrate having a mountain-shaped surface can be produced, for example, by the following method. (1) A method in which a female mold having a desired shape is formed on a drum in advance, and the shape is transferred onto the flat surface of a substrate having a flat surface by a roll transfer method. (2) A female mold having a desired shape is formed on a roller in advance, and an ultraviolet-curable resin or an electron beam-curable resin is coated on the roller. After being filled into the recess of the tube, a base having a flat surface is provided through the resin. The material covers the concave portion of the roller. In this state, the ultraviolet curable resin or the electron beam curable resin is cured by irradiating ultraviolet rays or electron beams, and the cured resin is transferred onto a flat surface of the substrate, and then peeled from the roller. Method (refer to Japanese Patent Application Laid-Open No. 3-2 2 3 8 8 3 or Japanese Patent Application Laid-Open No. 6-324205). (3) Flux casting method in which a female mold having a desired shape is formed on a casting belt in advance 'to form a desired shape by casting. (4) A method of processing the flat surface of a base material having a flat surface using a cutting tool to form a desired shape. A cured film is provided on the surface of such a substrate. The hardened film is formed by, for example, coating a hardening resin solution made of a hardening resin and a solvent on the surface of a substrate, and curing the hardening film. The hardening resin used here is, for example, acrylic resin, urethane resin, epoxy resin, polyester resin, alkyd resin, olefin resin, polyvinyl acetate resin, etc .; it may also be hardened by ultraviolet radiation. Ultraviolet hard paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) -9- (Please read the precautions on the back before filling this page)

526371 Printed by A7 B7, Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (7) Chemical resin, electron beam hardening resin hardened by electron beam irradiation, thermosetting resin hardened by heating, or It is a resin that is cured by removing the solvent. As a solvent, for example, toluene, dichloromethane, ethylene glycol-diethyl ether, and the like. The application of the curable resin solution can be performed by, for example, a roll coating method, a gravure coating method, a spray coating method, or the like. The thickness of the applied curable resin is appropriately selected depending on the cross-sectional shape of the substrate, the height of the top of the cross-section, and the pitch of the cross-sectional shape. From the standpoint of the visibility of the liquid crystal display device, the thickness to be applied is preferably such that the resulting cured film is approximately the thickness of a concave curved surface formed at the bottom between adjacent triangular columns. After the application, the cured curable resin is cured to form a cured film. On such a hardened film, a metal layer is laminated. As the metal constituting the metal layer, for example, aluminum or silver which can easily obtain a reflective plate having a high reflectance is preferable. In addition, by adjusting the thickness of the metal layer, the total light reflectance or total light transmittance of the reflecting plate can be appropriately selected. For example, when the thickness of the metal layer is approximately 10 to 100 nm, sufficient reflectance is obtained. Generally, if the thickness of the metal layer is about 10 to 30 nm, the obtained reflective plate is semi-transmissive, that is, a so-called semi-transparent reflective plate can be formed. As a method for forming the metal layer, for example, a method for generally forming a metal thin film, such as a physical vapor deposition (PVD) method such as a vacuum vapor deposition method, a thermal spraying method, or an ion spraying method, can be adopted. By this method, a metal layer having a thickness of approximately 丨 0 ~ 100nm with practically sufficient reflectivity can be formed; and, for example, by forming a thickness of approximately 10 ~ 30nm-- ----------------- Order --------- Line (Please read the precautions on the back before filling this page) This paper size applies to Chinese National Standards (CNS ) A4 specification (210 X 297 mm) -10- 526371 A7 B7 printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (8) The metal layer can have both light transmission. When the metal layer made of silver is formed by the P V D method of the steaming method, it is desirable to provide a protective layer above or / and below the metal layer in order to prevent deterioration of the metal layer. Although this protective layer is not particularly limited, it can be provided by, for example, painting acrylic resin, epoxy resin, polyester resin, polyurethane resin, alkyd resin, or the like. Brushing can be performed by a conventional method such as a roll coating method, a gravure coating method, or a spray coating method. A thin film of an inorganic substance such as silicon oxide can also be used as a protective layer. The thickness of the protective layer is usually in the range of 5 n m to 2 0 // m. In order to have the light-scattering property of the reflecting plate of the present invention, the surface roughness of the substrate may be increased (roughened). Alternatively, a light scattering layer may be laminated on the metal layer. Between the light-scattering layer and the metal layer, for example, there may be a protective layer for preventing deterioration of the metal layer. When the surface of the substrate is roughened, the average thickness of the center line of the roughened surface is usually in the range of 2000 to 1500 nm. If the average thickness of the center line is less than 2000 nm, sufficient light scattering properties cannot be obtained; and if the average thickness is greater than 150 nm, the maximum reflectance tends to decrease. The centerline average roughness of the surface is measured using, for example, a measuring device "3 S T" manufactured by Dektac. When the surface has such an average thickness of the center line, for example, the following method can be adopted. (1) A method for roughening the layout of the negative mold in advance, (2) A method of flatly pasting a resin mixed with inorganic or organic fine particles on the layout of the negative mold, and the paper size applies the Chinese National Standard (CNS) A4 specification ( 210 X 297 mm) -11-------------- install -------- order --------- line (please read the precautions on the back first) (Fill in this page again) 526371 A7 B7 printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (9) (3) After the surface of the substrate is shaped into the desired shape, the surface is sandblasted, or (4) A method of applying a coating liquid containing inorganic or organic fine particles to the surface after forming the surface of the substrate into a desired shape, and the like. As the light-scattering layer provided on the metal layer, for example, a layer made of a resin doped with dispersed particles is used. The particles used herein may be inorganic or organic. As inorganic particles, for example: silica dioxide particles, calcium carbonate particles, pearl dyes such as synthetic mica or natural mica coated with titanium dioxide, plate-like fish scales, hexagonal plate-like alkaline lead carbonate, and other particles with pearl luster; In addition, as the organic particles, for example, acrylic resin beads such as methyl methacrylate beads, polystyrene resin beads such as crosslink polystyrene beads, and polycarbonate resin beads are small. Beads, melamine, formaldehyde resin beads, benzoguanamine, benzoguanamine, formaldehyde resin beads, organic silica beads, etc. The diameter of the particles is not particularly limited, and is, for example, about 0.1 to 50 μm, ideally 1 to 2 0 // m, and more preferably 1 to 1 0 // m. These particles can be used alone or in combination of two or more. As the resin constituting the light-scattering layer, for example, acrylic resin, urethane resin, epoxy resin, polyester resin, alkyd resin, etc. may be used, but it is not limited to these types of resins. These resins may have adhesive properties. The combination of the particles and the resin is appropriately selected, and is preferably selected so that the difference in refractive index between the two is within a range of 0.001 to 0.5. The mixing ratio of the particles and the resin is, for example, 1 to 7 0 weight units relative to 100 weight units of resin 'mixed particles. ί The paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -12-— — — — — --I ---— — — — — II ^ «— — — — — III (Please (Please read the notes on the back before filling this page) 526371 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 _______B7 V. Description of the invention (10) To form a light scattering layer, for example, after mixing the particles and resin, use a normal wave It may be performed by a method such as a coating method, a gravure coating method, or a spray coating method. The thickness of the light scattering layer here is usually about 1 to 1 0 0 // m, preferably about 5 to 5 Q // m 〇 As the light scattering layer, a light scattering film can also be used. As such a film, a film containing the same particles and resin as described above may be used. Such a light-scattering film can be produced, for example, by a method of casting a mixture of particles and a resin, or by coating a mixture of particles and a resin on a film as a base material. The surface of these films may be embossed. Further, a thin film obtained by curing a mixture of a plurality of curable resins having different refractive indices may be used. The hardening of the mixture is appropriately selected according to the type of the hardening mixture used; for example, heat curing, ultraviolet curing, electron beam curing, and the like are used. The haze of the light-scattering film is, for example, 5% to 9%; its thickness is usually 1 // m to 1 mm. Such a light-scattering film can be laminated on a metal layer via a bonding layer formed of a bonding agent such as a pressure-sensitive bonding agent (adhesive) such as an acrylic pressure-sensitive bonding agent. . The light-scattering layer may be a single layer or a plurality of layers. When multiple light scattering layers are arranged, the composition of each layer may be the same, or different types of light scattering layers may be provided. In the above-mentioned reflecting plate, a reflective polarizing plate can be constituted by laminating a polarizing laminated layer on the uneven surface side, that is, a metal layer side. As the polarizing layer for this case, you can use the ordinary polarizing plate, specifically, for example installation (Please read the precautions on the back before filling out this page). · 丨 line · This paper size applies Chinese national standards ( CNS) A4 specification (210 X 297 mm) 13 526371 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 ____B7___ V. Description of the invention (11) For example: In the polyethylene film, the iodine is absorbed Polarized film made of dichroic dyes such as dichroic dyes, or dichroic dyes; or polarized light consisting of cellulose resin films such as cellulose triacetate and cellulose diacetate laminated on both or one side Floor. Such a polarizing layer can be laminated on a metal layer via a bonding layer formed of a bonding agent such as a pressure-sensitive bonding agent (adhesive) such as an acrylic pressure-sensitive bonding agent. When the light-scattering layer is laminated on the metal layer, a polarizing layer may be laminated on the light-scattering layer. On the other hand, a light-scattering layer may be provided on the polarizing layer of the reflective polarizing plate. As the light-scattering layer, a material made of the same material as described above can be used. The reflective plate of the present invention, or the reflective polarizing plate on which the polarizing layer is laminated on the metal layer side, can be assembled and used in a liquid crystal display device; the liquid crystal cell is arranged on the metal layer side of the reflecting plate or the polarizing light of the reflective polarizing plate. Layer side. Such a liquid crystal display device may have a light scattering layer on the back or front side of the liquid crystal cell. As a structural example of the liquid crystal display device, for example, the liquid crystal display device may be configured by sequentially arranging the elements shown below from the front side to the back side; however, it is not limited to these configurations and structures. . (1) A liquid crystal display device configured with a polarizing plate, a TN type liquid crystal lattice, a polarizing plate, and a reflecting plate. (2) A liquid crystal display device configured with a polarizing plate, a phase difference plate, an S T N type liquid crystal lattice, a polarizing plate, and a reflecting plate. (3) The size of the liquid crystal display equipped with the structure of G Η type liquid crystal lattice and reflecting plate is applicable to China National Standard (CNS) A4 (210 X 297 mm) ^ --------------- -^ (Please read the precautions on the back before filling out this page) 526371 Printed by the Industrial and Commercial Cooperatives of the Ministry of Economic Affairs and Industry Cooperative A7 B7 V. Description of Invention (12) Device. (4) A liquid crystal display device having a structure including a polarizing plate, a TN type liquid crystal lattice, a polarizing plate, a light scattering layer, and a reflecting plate. (5) A liquid crystal display device configured with a polarizing plate, a TN type liquid crystal lattice, a light scattering layer, a polarizing plate, and a reflecting plate. (6) A liquid crystal display device configured with a polarizing plate, a TN type liquid crystal cell, a light scattering layer, a polarizing plate, a light scattering layer, and a reflecting plate. (7) A liquid crystal display device configured with a polarizing plate, a light scattering layer, a TN type liquid crystal lattice, a polarizing plate, a light scattering layer, and a reflecting plate. (8) A liquid crystal display device configured with a polarizing plate, a light scattering layer, a TN type liquid crystal lattice, a light diffusing layer, a polarizing plate, and a reflecting plate. (9) A liquid crystal display device having a structure including a polarizing plate, a TN type liquid crystal lattice, a polarizing plate, a light scattering layer, a light scattering layer, and a reflecting plate. (10) A liquid crystal display device having a structure including a polarizing plate, a phase difference plate, an S T N type liquid crystal lattice, a polarizing plate, a light scattering layer, and a reflecting plate. (1 1) A liquid crystal display device configured with a polarizing plate, a phase difference plate, an S T N type liquid crystal lattice, a light scattering layer, a polarizing plate, and a reflecting plate. (1 2) A liquid crystal display device having a structure including a polarizing plate, a light scattering layer, a phase difference plate, a S-N liquid crystal lattice, a polarizing plate, a light scattering layer, and a reflecting plate. (1 3) A liquid crystal display device having a structure including a polarizing plate, a light scattering layer, a phase difference plate, an STN liquid crystal lattice, a light scattering layer, a polarizing plate, and a reflecting plate. (1 4) Configured with polarizing plate, phase difference plate, STN type liquid crystal grid, ί paper scale applicable to China National Standard (CNS) A4 specifications (210 X 297 mm) -15- II — — — — — — II ^ '— — — — — — I— (Please read the precautions on the back before filling out this page) 526371 A7 ———— B7 V. Description of the invention (13) Structure of polarizing plate, light scattering layer, light scattering layer and reflecting plate Liquid crystal display device. (Please read the note on the back? Matters before filling out this page) (1 5) A liquid crystal display device with a light scattering layer, a G-type liquid crystal lattice and a reflective plate. (16) A liquid crystal display device including a GΗ-type liquid crystal cell, a light scattering layer, and a reflecting plate. (17) A liquid crystal display device configured with a light scattering layer, a polarizing plate, a TN type liquid crystal lattice, a polarizing plate, and a reflecting plate.

I (18) A liquid crystal display device configured with a light scattering layer, a polarizing plate, a phase difference plate, an STN type liquid crystal lattice, a polarizing plate, and a reflecting plate. In these liquid crystal display devices, one or two optical phase functional films such as a retardation plate or a film for viewing angle compensation may be disposed on the top surface and / or the bottom surface of each liquid crystal cell. When the reflecting plate is a semi-transmissive reflecting plate, a lighting device (backlight) may be provided on the back side. [Embodiment] Printed by the Ministry of Economic Affairs, Bureau of Industry and Consumer Cooperatives The present invention will be further described in accordance with the following examples, but the present invention is not limited to these embodiments. The depth d of the section was measured with a surface shape measuring microscope ("VF-7500" manufactured by Keyennsu Corporation). The angle dependence of the amount of reflected light (relatively 値) was measured by Murakami Color Technology Research Institute (Co., Ltd. ) Manufactured automatic angle-varying photometer "GP-200" for evaluation; and the total light transmittance and total light reflectance are measured using the reflection transmission measuring device "HR" manufactured by Murakami Color Technology Laboratory (Co., Ltd.). -1 00 ”to measure. ί The paper size is in accordance with China National Standard (CNS) A4 (210 X 297 mm) -16- 526371 A7 B7 V. Description of the invention (14) Example 1 The substrate surfaces are substantially triangular triangle pillars that are aligned with each other. The shape adjacent to the ridge line; for this shape, the elevation angle of the triangle formed by the two corners of the cross section of the ridge line of the triangular column in the vertical direction is about 4 5. The apex angle is about 90 °; the UV-curable acrylic resin solution is coated on a zigzag plastic sheet with a repeated pitch of about 50m / m and a triangle height of about 25m. Then, ultraviolet rays were irradiated to obtain a cured film. This hardened film has a concave curved surface between adjacent triangular columns. On this hardened film, aluminum was vapor-deposited on this hardened film to obtain a semi-transmissive reflective plate having a vapor-deposited film having a film thickness of about 200 A. As a result of investigating the cross-sectional shape of the semi-transmitting reflector, the concave curved surface between the adjacent triangular columns and the depth between the adjacent triangular columns are approximately 1 m. Furthermore, the bottom B of the valley is connected to its adjacent The angle z ABC between the two straight lines a and C at the top is approximately 1 3 3. . This semi-transmissive reflecting plate was bonded to the glass with an adhesive, and the angle of incidence was 30 °. The direction of the reflected light is used to evaluate the angular dependence of the amount of reflected light. This evaluation is performed by measuring the amount of reflected light 'according to the angle (0), and then marking the distribution curve of the amount of reflected light with respect to the angle'. The angle-dependent distribution curve of the obtained reflected light quantity is shown in FIG. 5. According to Fig. 5, the amount of reflected light is large even at an angle deviating from the regular reflection angle _ + 30 °. The transflective reflector has a total light transmittance of 12 · 2% and a total light reflectance of 64.3%.

Polarizing plate ("SJ I ------------ made by Sumitomo Chemical Industry Co., Ltd .--- (Please read the precautions on the back before filling this page). -I line-Economy The Ministry of Wisdom and Industry Bureau S Industry and Consumers Cooperative Press · This paper size applies to Chinese National Standard (CNS) A4 (210 X 297 public love) -17- 526371 Consumer cooperation Μ A7 B7 V. Invention description (15) ") Laminating on the metal layer side of this transflective reflective plate, a reflective polarizing plate was fabricated. This reflective polarizer is mounted on the back of the sTN type, and a phase difference plate ("SEF" manufactured by Sumitomo Chemical Industry Co., Ltd.) and a polarizer (manufactured by Sumitomo Chemical Industry Co., Ltd.) are sequentially installed in front of this "SJ") to obtain a reflective STN type liquid crystal display device. In this reflective STN liquid crystal display device, a polarizing plate, a phase difference plate, an STN liquid crystal cell, a polarizing plate, and a reflecting plate are sequentially stacked from the front side. When this reflective STN type liquid crystal display device is driven, it is bright even when viewed from the perspective of exposure to external light, and its visibility is excellent. Example 2 On the metal layer side of the transflective reflective plate obtained in Example 1, a tacky acrylic resin having a thickness of about 2 5 // m was applied, and the acrylic resin contained an average of 2% by weight. Cross-link polystyrene beads with a diameter of 4 // m to laminate the light scattering layer. The semi-transmissive reflective plate laminated with this light scattering layer was bonded to the glass, and the light was irradiated from the glass side in the direction of the incident angle-30 °, and the result of the angle-dependent distribution curve of the reflected light amount was obtained, even if it was from positive The angle of deviation of the reflection angle has a high reflection intensity. A reflective polarizing plate was produced in the same manner as in Example 1 except that a semi-transmissive reflective plate laminated with a light-scattering layer was used instead of the semi-transmissive reflective plate obtained in Example 1, and a reflective polarizing plate was further produced. S T N type liquid crystal display device. This reflective S T N type liquid crystal display device has a polarizing plate, a phase difference plate, an S T N liquid crystal cell, and a polarizing plate sequentially stacked from the front side (please read the precautions on the back before filling this page)

This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) -18-526371 A7 B7 Economics, wisdom and industry bureau_Printed by Industrial and Consumer Cooperatives V. Description of invention (16), light scattering layer and reflection board. When this reflective S T N type liquid crystal display device is driven, it is bright even when viewed from a standpoint of external light irradiation, and its visibility is excellent. Example 3 On the surface of the substrate, triangular pillars which are substantially combined with each other are arranged in a shape adjacent to each other in the ridgeline direction. For this cross-section of the vertical direction of the ridgeline of the triangular column, the elevation angle of the triangle formed by each triangle is approximately 7 5 °, apex angle is about 8 2 · 5 °; UV-curable acrylic resin solution is coated on a zigzag plastic sheet with a repeated pitch of about 3 Ό // m, after drying, it is irradiated with ultraviolet rays to obtain Harden the coating. This hardened film has a concave curved surface between adjacent triangular columns. Aluminum was vapor-deposited on this hardened film to obtain a semi-transparent reflection plate having a vapor-deposited film having a film thickness of about 200 A. As a result of investigating the cross-sectional shape of the semi-transparent reflecting plate, a concave surface between adjacent triangular columns and a depth between the adjacent triangular columns were about 0.9 // m; and, the bottom B of the valley and its phase were connected. The angle z ABC between the two straight lines A and C at the adjacent tops is about 173 °. The angle-dependent distribution curve of the obtained reflected light amount is shown in FIG. 6. Even if deflected from the regular reflection angle + 30 °, the amount of reflected light is large. A polarizing plate ("SJ" manufactured by Sumitomo Chemical Industry Co., Ltd.) was bonded to the metal layer side of the semi-transmitting reflecting plate to produce a reflective polarizing plate. This reflective polarizer is mounted behind the S T N frame. On the other hand, on the front side of the liquid crystal cell, a phase difference plate (SEF manufactured by Sumitomo Chemical Industries, Ltd.) and a polarizing plate (Sumitomo's paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297) (Mm) -19-(Please read the notes on the back before filling in this page)--Binding: --Thread_ 526371 A7 B7 V. Description of Invention (17) "SJ" manufactured by Chemical Industry Co., Ltd.), get Reflective s TN type liquid crystal display device. In this reflective S T N liquid crystal display device, a polarizing plate, a phase difference plate, an S T N liquid crystal cell, a polarizing plate, and a reflecting plate are sequentially arranged from the front side. When this reflective S T N type liquid crystal display device is driven, it is bright even when viewed from the perspective of exposure to external light, and its visibility is excellent. • · ψ 冬 P / i 'Consumption containing f Example 4 The triangular prisms on the surface of the substrate that are substantially combined with each other are arranged in a shape adjacent to each other in the ridgeline direction; this shape, for the vertical section of the ridgeline of the triangular column, is The triangle formed by each triangle residence has an elevation angle of approximately 9 ° and an apex angle of approximately 81 °; on a jagged plastic sheet with a repeated pitch of approximately 30m / m and a height of approximately 5 # m A UV-curable acrylic resin solution was applied and dried, and then the UV-ray was irradiated to obtain a cured film. Aluminum was vapor-deposited on this hardened coating film 'to obtain a semi-transmissive reflection plate having a vapor-deposited film having a film thickness of about 150 A. As a result of investigating the cross-sectional shape of the semi-transmitting reflector, the depth of the concave surface is about 1.6 m; and the angle ZABC between the two straight lines connecting the bottom B of the valley and the adjacent tops A and C is about It is 168 °. This semi-transmissive reflecting plate was bonded to glass with an adhesive, and the light was irradiated from the direction of the incident angle-30 ° to obtain the angle-dependent distribution curve of the amount of reflected light. As a result, the reflection intensity is high even at an angle deviating from the regular reflection angle + 30 °. The transflective reflector has a total light reflectance of 56% and a total light transmittance of 9%. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -20- (Please read the precautions on the back before filling this page) --- ----- 7 --- --- -7 Tested by Hui Hui; 1 Gou: Printed by Industrial Cooperative Cooperative. 526371 A7 V. Description of the invention (18) On the side of the metal layer of the semi-transparent reflection plate, the coating thickness is about 2 5 | # m Acrylic resin with tackiness, this acrylic resin contains cross-link polyphenylene i-vinyl beads' with an average particle diameter of 12% by weight and 12% by weight. Scattering layer. A transflective reflector with a light-scattering layer was used, as in Example 1, a polarizing plate, STN type lattice, phase difference plate, and light-scattering transflective reflector were mounted to obtain a transflective reflector. STN type liquid crystal display device. This semi-transmissive reflection type STN type liquid crystal display device sequentially stacks a polarizing plate, a phase | difference plate, an STN liquid crystal lattice, a polarizing plate, and a light-scattering transflective reflection plate I 〇I from the front side. When the transflective S TN type liquid crystal display device is used, it is bright even when viewed from the perspective of leaving outside light, and its visibility is excellent. Example 5 A light-scattering film having a haze of 74% was laminated on the metal layer side of the same semi-transparent reflective plate as in Example 4 using an adhesive. The obtained laminated product of the light-scattering film and the transflective reflecting plate was bonded to the glass with an adhesive, and then the light was irradiated from the direction of the incident angle-30 ° to obtain the angle-dependent distribution curve of the reflected light amount. . As a result, at an angle deviating from the regular reflection angle + 30 °, there is an extremely large reflection intensity. This semi-transparent reflecting plate has a total light reflectance of 52% and a total light transmittance of 10%. In addition to using the semi-transmitting reflector with a light scattering layer obtained here, the Hi standard is applicable to China National Standard (CNS) A4 (210 X 297 mm) -21-^ -------- t-- ------- line (please read the precautions on the back before filling this page) 526371 A7 "~ ---- I. Description of the invention (19)

Other than I I ', as in Example 1, a polarizing plate, an STN type,

I! Phase difference plate and light-scattering transflective reflection plate to obtain a transflective reflection type i 0 _ I s TN type liquid crystal display device. In this transflective s TN type liquid crystal display device, a polarizing plate, a phase difference plate, a s TN liquid crystal lattice, a polarizing plate, and a light scattering transflective reflecting plate are sequentially stacked from the front side. When this semi-transmissive! | Reflective s TN type liquid crystal display device is driven, it is bright even when viewed from a point where it is irradiated with external light !, and its visibility is excellent. !

I!!! Example 6

I On the metal layer side of the same semi-transparent reflective plate as in Example 4, a light-scattering film having a haze (haz) of 86% was laminated with an adhesive. Except that the semi-transmissive reflection plate with a light scattering / layer attached is thrown away, as in Example 1, a polarizing plate, an STN type lattice, a phase difference plate, and a light-scattering semi-transmission reflection plate are mounted to obtain a semi-transmission reflection type. ST N type liquid crystal display device. In this transflective STI LCD device, a polarizing plate, a phase difference plate, a STN liquid crystal lattice, a polarizing plate, and a light-scattering semi-transmissive reflecting plate are sequentially stacked from the front side. When the semi-transmissive reflective TN type liquid crystal display device is driven, even when viewed from the perspective of leaving outside light, it is bright and has good visibility.

I I Comparative Example 1 | Using the same substrate as in Example 3, except that the UV curing type acrylic resin solution was not applied on the surface, a semi-transparent reflection plate was obtained in the same manner. -------- Order --------- line (please read the precautions on the back before filling this page) This paper size is applicable to China National Standard (CNS) A4 (210 X 297) (Centimeter) 22 526371 Bureau F, Industrial Co., Ltd. "SJ side," behind the reflection type τ N-type manufactured by Feiyin Agricultural Co., Ltd. A phase difference plate (Sumitomo Chemical) and a polarizing plate (Sumitomo) are also installed. When the reflection type TN liquid crystal display device panel, the S-N liquid crystal display panel, and the S TN liquid crystal display are installed in perspective, there will be a rapidly darkened portion A7 B7 V. Description of the invention (20) Polarization Plate ("Sumitomo Chemical Industry Co., Ltd.") is attached to the semi-transparent reflective metal layer polarizing plate. This reflective polarizing plate is installed on the S side. On the front side of the liquid crystal cell, Anxue Industrial Co., Ltd. "SJ" STN type liquid crystal display device manufactured by "SEF Chemical Industry Co., Ltd." In this reflective type S, a polarizing plate, a phase difference polarizing plate, and a reflecting plate are arranged in this order from the front side. When this reflective type is driven, even if there is a bright angle from the outside light irradiation, if the viewing angle is changed, the visibility is insufficient. [Effects of the Invention] Compared with the conventional reflection type liquid crystal display device, the reflection type liquid crystal display device using the reflection plate of the present invention has a bright display screen and a visual recognition, even when viewed from a perspective of leaving outside light. Excellent sex. [Brief description of the drawing] Fig. 1 is a cross-sectional view schematically showing an example of a reflecting plate specified in the present invention, and the dotted line represents the surface of the substrate. Fig. 2 is a cross-sectional view schematically showing another example of the reflecting plate specified in the present invention; the dotted line shows the surface of the substrate. Figure 3 shows the -------- ^ --------- lines that are suitable for making the reflective plate of the present invention (please read the precautions on the back before filling this page). Paper size applies to China National Standard (CNS) A4 specification (210 X 297 mm) -23- 526371 A7 ____B7___ V. Description of the invention (21) A perspective view of an example of a substrate. Fig. 4 is a perspective view schematically showing another example of the base material. FIG. 5 is an angle-dependent distribution curve of the amount of reflected light of the reflecting plate obtained in Example 1. FIG. FIG. 6 is an angle-dependent distribution curve of the amount of reflected light of the reflecting plate obtained in Example 3. FIG. [Symbol description] A: top B: bottom of valley C: another top adjacent to bottom B of valley P: pitch ------------- installation -------- order-- ------- line (Please read the notes on the back before filling out this page) The financial standard is applicable to China National Standard (CNS) A4 (210 X 297 mm) · 24-

Claims (1)

5263 | 74 ----------------------------- i Bulletin § D8 VI. Patent Application Scope 1 · A reflecting plate with characteristics For: (Please read the precautions on the back before filling in this page) The reflective surface is a concave and convex stripe surface with a pitch of less than 5 0 // m; For a section perpendicular to the ridge line, connect the valley bottom The angle between the two straight lines of the top and the two adjacent tops is 80 °. Above, 1 8 〇. Below; and the concave curve between adjacent tops is not a true arc. 2. The reflecting plate according to item 1 of the scope of patent application, wherein the reflecting surface is composed of a metal layer. 3. The reflecting plate according to item 1 of the scope of patent application, which is composed of a base material, a hardened film on the surface of the base material, and a metal layer on the hardened film; the base material has a triangular column arranged Shapes adjacent to each other in the ridge line direction. For the cross section perpendicular to the ridge line of the triangular column, the triangles formed by the triangular columns are arranged in a zigzag pattern with each other; and the surface of each triangle has an elevation angle of 2 · 5 ° or more. 4. The reflecting plate according to item 1 of the scope of patent application, wherein a light scattering layer is laminated on the reflecting surface. Clothing printed by employees' cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5 · The reflector as described in the scope of patent application No. 1, 2, 3 or 4, which has light transmission. 6 · A method for manufacturing a reflective plate, characterized in that: a surface of a substrate is coated with a hardening resin solution, dried and hardened, and then a metal layer is formed; the above-mentioned substrate has triangular prisms arranged at ridgelines Shapes adjoining in the direction; for the cross section perpendicular to the ridge line of its triangular column, the shape of each triangular column is -25- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 526371 A8 B8 C8 D8 6. Scope of patent application The triangles formed are arranged in a zigzag pattern with each other; and each triangle has a surface with an elevation angle of 2 · 5 ° or more. 7 · The method for manufacturing a reflective plate as described in item 6 of the scope of the patent application, wherein the curable resin is selected from acrylic resin, polyurethane resin, epoxy resin, polyester resin, alkyd resin, olefin resin, and polymer. At least one kind of resin selected from vinyl acetate resin. 8 ·· —A reflective polarizing plate, characterized in that a polarizing layer is laminated on the reflecting surface side of the reflecting plate described in item 1 of the scope of patent application. 9. The reflective polarizing plate as described in item 8 of the scope of patent application, wherein a light scattering layer is further laminated on the polarizing layer. 10. A liquid crystal display device, characterized in that: a liquid crystal cell is arranged on the reflective surface side of the reflective plate described in item 1 of the scope of patent application. 1 1 · A liquid crystal display device, characterized in that: a liquid crystal cell is arranged on a polarizing layer side of the reflective polarizing plate described in item 8 or 9 of the scope of patent application. (Please read the precautions on the back before filling out this page.) Printed clothing for the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs -26- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)