TW594278B - Sidelight-type light-guiding plate - Google Patents

Abstract

The present invention relates to a backlight system for a liquid crystal display (LCD). More particularly, the present invention provides a light-guiding plate used, particularly in a sidelight-type backlight system and related techniques. The present invention provides a light-guiding plate, which can eliminate either of a polarizing plate, a diffuser sheet and a prism sheet required when an LCD panel is assembled, or a part thereof, and which enhances brightness.

Description

594278 A7 B7 V. Description of the Invention (Field of the Invention The present invention relates to a backlight system for a liquid crystal display (LCD). In particular, the present invention provides a backlight system especially used in edge-lit backlight systems and related technologies. BACKGROUND OF THE INVENTION In order to obtain screen brightness, since the liquid crystal display itself does not emit light, it is necessary to use light from the outside or from an auxiliary light source, which is called "backlight π." The advantage of the "backlight" system is To improve the performance of L c D, because it may be used in places where there is insufficient light outside, and when the light source is raised, it can also achieve compactness and colorization. The light system can be roughly divided into direct system and side light The direct type system is a system in which a plurality of cold cathode tubes are arranged on the lower side of the LC d unit. Although this system can slightly uniform the screen brightness, its disadvantages are, for example, increased power consumption and increased L c The thickness of D body and other similar problems. On the other hand, the side light type system is a type where about one or: cold cathode tubes are placed A system that changes linear light sources to planar light sources on the edge of the lower side of the L c D unit. This system reduces the number of cold cathode tubes', reduces power consumption, and reduces the thickness of the L c D body. However, since the light is located in One side, there will be the problem of uniform brightness of the screen. When assembling the panel, the above-mentioned side-light type backlight system requires a light guide plate to receive the light from the cold cathode tube on the edge surface and change it into a flat light source, which requires astigmatism. Sheet to make the light from the flat light source uniform, further needs a diamond lens to focus the light on the LCD unit to enhance its brightness, and other similar structures. The light guide plate and these sheets are only stacked on this paper scale. Towel Closer Standard (CNS) A4 specification (⑽MW public love) 594278 A7 _______ B7 V. Description of the invention (2) Together, as described in JP-A 2000-147497. In this method, since the assembly of the panel is complicated, it requires It takes a long time and costs a lot. In addition, based on the working principle of the LCD, the backlight system uses two polarizers, so that the LCD unit is between the two polarizers. Simple stacking by any method. The disadvantage of the simple stacking method is' Since a low refractive index air layer exists between the layers, the light reflectance at the interface will become very high, causing an important amount of penetrating light. In addition, there is a problem that it takes a long time to stack. SUMMARY OF THE INVENTION The present invention provides an edge-light type light guide plate including an insert-shaped polarizing plate. That is, in the light guide plate of the present invention, since the polarizing plate is The shape is inserted into the light guide plate, so the amount of penetrating light is not reduced, and since the driver does not need to stack many sheets for a long time, the yield can be improved. The side-light type light guide plate of the present invention is characterized in that the polarizing plate is The composite sheet includes at least a polarizer and a resin sheet. The resin sheet is made of the same resin as the base resin constituting the light guide plate, and the matrix resin and the resin sheet are both thermally bonded by insert molding. together. That is, since the light guide plate of the present invention has a resin sheet made of the same resin as the matrix resin constituting the light guide plate, the resin sheet can be thermally bonded to the side wall of the substrate. The side-light type light guide plate of the present invention is characterized in that the polarizing plate is a composite sheet and has three or more thin layers, including at least a light diffusing sheet, a polarizing sheet, and a resin sheet. Matrix resin same resin-5-594278

[Explanation of the Invention] (Construction, the matrix resin and the resin sheet are both thermally bonded together. The Wan Shi of the molding method of the present invention is a side light type light guide plate characterized by having three or more thin layers, It includes at least Ling :: 5 pieces. ': Fat piece. The resin piece is the substrate that constitutes the light guide plate: fat phase =: Γ. Both the resin and the resin piece are thermally bonded to each other by insert molding. It is characterized by the invention that the side-light type light guide plate is characterized in that the polarizing plate is a composite sheet having four or more thin layers, including at least a diamond lens, a diffuser, a polarizer and a resin sheet, and the resin sheet. It is composed of the same resin as the matrix resin constituting the light guide plate. "The matrix resin and the resin sheet are thermally bonded together by insert molding. The edge-light type light guide plate of the present invention is characterized in that The matrix resin 疋 is selected from the group consisting of poly (meth) acrylate, polycarbonate, polyamide, polyester, and a resin having a gold steel alkyl group or a cyclopentyl alkyl group in the main chain, among which The main chain is a hydrocarbon. Description Fig. 1 shows a schematic perspective view (A) and a vertical sectional view (B) of a side light type light guide plate using one cold cathode tube. Fig. 2 shows a perspective view of a side light type light guide plate using two cold cathode tubes. Schematic diagram (A) and vertical sectional view (b). Detailed description of the invention The side-light type light guide plate of the present invention is a light guide plate in which a polarizing plate having a polarizing function is inserted and formed therein. The polarized light used in the present invention The board is a -6-this paper size suitable wealth @ ® 家 鲜 (CNS) A4 size (㈣χ tear public love) 594278 A7

The composite sheet includes a polarizer and at least one different sheet having no polarizing function. For example, among the sheets constituting the polarizing plate used in the present invention, when the polarizing plate is inserted into the light guide plate, astigmatism sheet, diamond lens, and other similar structures, different sheets having no polarizing function include polarized light. A protective sheet for a sheet is a resin sheet in which a polarizer of a light guide plate and a matrix resin are thermally bonded together. 1. Polarizer_ Polarizer is a uniaxially stretched sheet with uniform thickness (usually 0 mm or less), such as poly (vinyl alcohol), poly (vinyl acetal), Poly (vinyl butyral) and similar materials, or stabilized flakes in the form of shapes. From a practical standpoint, the polarizer of the present invention preferably has a polarizing angle 'of 80/0 or higher, and more preferably 95% or higher. In order to obtain a higher polarization angle ', when preparing the above uniaxially stretched sheet, iodine or dichromate dye is doped as it is stretched. The polarizer of the present invention is prepared by a dedoping method or a dye doping method. % The polarizers prepared by the dye doping method show problems with the appearance of the original hue in the dye, but have higher heat resistance and higher water resistance. On the other hand, the polarizers prepared by the iodine doping method are worse than the polarizers prepared by the dye doping method of the dichromate dye, but there are not so many original colors in the dye, and it is easy. Shows a higher polarization angle. Therefore, it can be considered that the above two methods are appropriately selected when using a polarizer. 2. Protective sheet The paper size is suitable for towels, papers, and counties (CNS) A4 ^ grid (2iGχ 297 public love) 594278 A7 — _______B7 Description of the invention (5) ~ ~ — Generally, the protective sheet for polarizers has about 0. The thickness of 0 mm is preferably from 0.03 to 0.8 mm. When the thickness is less than 0.01 mm, the sexual offense of protecting the polarizer is easy to be worse. When the thickness is greater than 〇 mm, the bending hardness becomes equal, so characteristics such as bendability, stackability, and workability may deteriorate. In order to obtain a protective sheet with small optical anisotropy, it is recommended in the present invention to use a photoelastic modulus of 30 X 1 · 13 cm'dyne or lower, preferably 2〇χ 1 0 · 13 cm2 / dyne Or lower and a resin having a glass transition temperature of about or higher and preferably 50 ° F or higher. When the photoelastic modulus is higher than 30 × 10-u Cm2 / dyne, the optical anisotropy becomes larger due to the residual internal strain, local orientation, and similar characteristics in the obtained sheet. Generally, the protective sheet is prepared by extrusion molding or solvent casting. (a) Preparing a protective sheet by extrusion molding For preparing a protective sheet by extrusion molding, for example, the material of the sheet includes polycarbonate, polyamide, polyester, poly (meth) acrylate, and poly (meth) acrylate. Vinyl chloride), poly (styrene_co_methyl methacrylate), poly (acrylonitrile · co-styrene), poly (4-methyl-1-pentamidine), adamantane ring on the main chain Or cyclopentane cyclofoot resin, polyurethane, and acetate thermoplastic resins such as triacetate. Among them, from the viewpoint of toughness and transparency, it is recommended to use poly (meth) acrylate, fluorene-based fibers, polycarbonate, polyamide, and polyester. For example, "poly (meth) acrylate" is methyl methacrylate, methacrylate, ethacrylate, cyclohexyl-8, which includes homogeneous polymers-This paper is applicable to China Standard (CNS) A4 size (210X297 mm) 594278 A7

Esters and similar materials, and their copolymers. Among these, from the viewpoint of toughness and general characteristics, poly (meth) acrylate is preferred. For example, '' fluorene-based fibers' include acetate fibers such as triacetate fibers and diacetate fibers, and propionate fibers such as tripropionate fibers, and dipropionate fibers, and the like. They all require or require the addition of plasticizers. For example, "polycarbonate" includes bisphenyl A polycarbonate. For example, it also includes the homogeneity of bis (4-benzoic acid) -1-phenyl ether, bis (4-benzoic acid) bisphenylpyrane, or 2,2 · bis (4-hydrooxy-3-tolyl) propane. Polymeric polycarbonates, and copolymers of any of the above compounds with bisphenyl A polycarbonate. Among them, bisphenyl A polycarbonate is preferred from the viewpoints of robustness and general properties. Generally, the disadvantage of polycarbonate is that the birefringence becomes large. That is, optical anisotropy easily occurs because of the forming strain and local orientation in the formed product. Therefore, when polycarbonate is used in the present invention, it is important to avoid optical anisotropy as much as possible. The method is that it is best to use a resin with a low degree of polymerization and high fluidity, and it is difficult to accept excessive shear forces (that is, it is difficult to cause residual internal strain and local orientation) during molding. Polycarbonate having a polymerization degree of 120 or less is recommended in the present invention, and a polymerization degree of 100 or less is preferable. For example, "polyamidoamine" is a polycondensation compound including a diamine component, for example, hexylmethinediamine, m-tolylmethyldiamine, bis (4-aminocyclohexyl) methane, (4-amino-3 -Methylcyclohexyl) methane, trimethylhexamethylene diamine, and polyacid compounds such as adipic acid, dodecyl diacid, isophthalic acid or lactam, such as hexamethylene Leptamine. -9- This paper size is in accordance with Chinese National Standard (CNS) A4 (210X 297 mm) 594278 A7 B7 5. Description of the invention (7) Especially when high transparency is required, it is best to use amorphous Nylon or transparent and thrifty poly-vinylamine. For example, EMS-CHEMIE's GRILAMID TR-55 ", " GRILAMID TR-90 ·," Hiils AG (now Degussa AG) "TROGAMID CX- 732 ". Transparent Nylon generally has less optical anisotropy. In addition, it is easier to have higher solvent resistance than polycarbonate. For example," Polyester π is included such as terephthalic acid, isophthalic acid Polycondensation compounds of formic acid and similar dibasic acids, as well as ethylene glycol, butanediol, 1, Polycondensation compounds of di-cyclohexyl dimethanol and similar materials. Preferably, poly (ethyl phthalate) and its copolymers and poly (ethyl phthalate) and its copolymers are used. For thermoplastic resins that meet the above-mentioned photoelastic modulus and glass transition temperature, it is recommended to use resins with a gold steel alkyl group or cyclopentyl alkyl group on the hydrocarbon main chain, such as "ARTON" by JSR, and "Arton" by Nippon Co., Ltd. ZEONEX ", " APEL " by Mitsui Chemicals, and similar materials. The protective sheet is preferably substantially free of molecular orientation, or the orientation has been disturbed. For example, extrusion molding methods include methods that involve passing the resin through Long ellipse mold to melt-extrude onto the gripping device or conveyor belt, and then solidify into a sheet shape, which requires or does not need to be stretched in the direction of extrusion or cross-section, resulting in molecular orientation (ie, T-shape) (Mold method), and a method (tube method) including blowing a resin like a balloon and then curing (tubular method). (B) preparing a protective sheet by solvent casting, and the solvent casting method includes casting a resin solution in which the resin is dissolved in a solvent to Conveyor belt or plate, and then remove the solvent, such as emptying, plus -10- This paper size applies to China National Standard (CNS) A4 specifications ( 210 X 297 mm) 594278 A7 Description of the invention Heat and similar methods to form flakes. For example, resins particularly suitable for use in solvent casting methods preferably include triacetate'-acetate, tripropionate, and diacetate. Propionate-based fiber resin. ㈣For the purpose of essentially disrupting molecular orientation, resins suitable for extrusion molding can be formed by solvent casting. 3 · Resin sheet

In general, the resin sheet for a polarizer has a thickness of about 0.02 to 1011111, and more preferably 0.03 to 0.8 mm. When the thickness is small, the matrix resin of the light guide plate is likely to have poor thermal bonding strength. When the thickness is greater than U mm, the hardness of Baoqu becomes stronger, so characteristics such as bendability, stackability, and workability may deteriorate. In order to know the resin sheet with smaller optical anisotropy, the photoelastic modulus of the resin used in the present invention " 13 2 is 30 x 10 cm / dyne or lower and the most. Coffee / dyne or higher Low and glass transition temperature is about 牝 乇 or ηΓ " 疋 50 ° C or higher. When the photoelastic modulus is higher than 30 X 10_13 yne, the residual orientation and similar characteristics of the obtained sheet towel, and the optical anisotropy becomes larger. Top: The resin sheet is formed by extrusion or solvent. Table 7 (a) Prepare a resin sheet base by extrusion; the tree St shows that the resin sheet used is to be thermally bonded to the light guide plate: the resin sheet is preferably the same resin as the matrix resin, such as, The resin includes f9, but has better injection moldability. Example g 'carbonate' polyamidamine, polyester, polystyrene, poly

Decoration-11-594278 A7 ____B7 I. Description of the invention (9 ~ " (meth) acrylate, poly (vinyl chloride), poly (phenethylfluorene-co-methyl acrylic acid methyl ester), poly (propylene Nitrile · co · styrene), poly (4-methyl-pentamidine), resins with gold steel ring or cyclopentane ring in the main chain, such as polyurethane resins. Among them, the toughness and From the viewpoint of transparency, it is suggested to use poly (meth) acrylate, polycarbonate, polyamide, and polyglycol. For example, " poly (meth) propionate " is a methyl group including a homogeneous polymer. Methyl acrylate, methacrylate, ethylpropionate, cyclohexyl methacrylate, and similar materials, and copolymers thereof. Among them, from the viewpoint of toughness and general characteristics, the best Is a poly (meth) propionate. For example, π polycarbonate "includes bisphenyl A polycarbonate. For example, it also includes 1,1-bis (4-benzoic acid) -1 · phenyl ether, bis (4 -Benzoic acid) bisphenyl methylbenzene, or 2,2 · bis (4-hydroxyoxy-3-tolyl) propane homopolymerized polycarbonate, and any of the above compounds Copolymers of polymers and bisphenyl A polycarbonate. Among them, polycarbonate is preferred from the viewpoints of toughness and general properties. Generally, the disadvantage of polycarbonate is that the birefringence increases. That is, Optical anisotropy is easy to occur because of the forming strain and local orientation in the molded product. Therefore, when polycarbonate is used in the present invention, it is important to avoid optical anisotropy as much as possible. Method The above is that it is best to use a resin with a very low degree of polymerization and high fluidity, and it is difficult to accept excessive shear forces (that is, it is difficult to cause residual internal strain and local orientation) during molding. It is suggested in the present invention Use a polycarbonate with a degree of polymerization of 120 or less, preferably a degree of polymerization of 100 or less. For example, "polyamine" is a polycondensation compound that includes a diamine component, such as hexyl fluorenyldiamine. , M -toluylmethyldiamine, bis (4-aminocyclohexyl) methyl-12- This paper size applies to China National Standard (CNS) A4 specifications (21〇 > < 297 mm) 594278 A7 B7 V. Invention (10) Alkanes, (4-amino-3-fluorenylcyclohexyl ) Polycondensation compounds of methane, trimethylhexamethylene diamine, and dibasic acids, such as adipic acid, dodecyl diacid, isophthalic acid, or lactam, such as caprolactam. Especially when high transparency is required, it is best to use amorphous or transparent polyamines. For example, EMS-CHEMIE's GRILAMID TR-55, GRILAMID TR-90 ", "TROGAMID CX-732" by Hiils AG (now Degussa AG). Transparent Nylon generally has less optical anisotropy. In addition, Juggel is more likely to have higher solvent resistance than polycarbonate. For example, "polyesterπ" is a polycondensation compound including dibasic acids such as terephthalic acid, isophthalic acid, and the like, and materials such as ethylene glycol, butanediol, 1,4-cyclohexyldimethanol, and the like Polycondensation compounds of dibasic acids. Poly (ethyl phthalate) and its copolymers and poly (ethyl phthalate) and its copolymers are preferably used. For satisfying the above-mentioned photoelastic modulus For thermoplastic resins with glass transition temperature, it is recommended to use resins with gold steel alkyl groups or cyclopentyl alkyl groups on the hydrocarbon backbone, such as JSR Corporation's "ARTON", Nippon Co., Ltd. "ZEONEX", Mitsui Chemicals' "APEL" and similar materials. The resin sheet is preferably substantially free of molecular orientation, or the orientation has been disturbed. For example, the extrusion molding method includes a method including melting the resin through an oblong die, extruding it onto a gripping device or a conveyor belt, and then solidifying it into a sheet shape. Stretching in the tangential direction causes molecular orientation (ie, the T-die method), and a method that involves blowing a resin like a balloon and then curing (tubular method). -13- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

(b) Preparing a protective sheet by solvent casting. The method includes washing a bond with a resin solution in which a resin is dissolved in a solvent, and the like to form a sheet. J force,-2: 1: In particular, resins suitable for use in the solvent casting method preferably include: 隹 -acetate fiber 'dipropionate fiber and 醅 醅 fiber resin of dipropionate fiber. For the purpose of essentially disturbing the molecular orientation, the resin suitable for the extrusion molding method can be formed by a solvent casting method. 4. Astigmatism sheet The astigmatism sheet used in the present invention is a sheet having light scattering properties. Use light scattering on the particle-particle boundary of inorganic or organic particles contained in a sheet having a thickness of less than 1 leg or less, or use light scattering on the small uneven surface of the sheet to use the sheet to Further, the light from the planar light source from the light guide plate is uniformized. Since the transmitted light is reduced, generally only one sheet is used. The thermoplastic resin for the protective sheet is generally used for a light-diffusing sheet, and particularly preferred is poly (ethylene terephthalate) and bisphenyl A polycarbonate. 5. Rhombus lens The Rhombus lens used in the polarizing plate of the present invention is used to enhance the brightness, and the light from the planar light source that is uniformized by the diffuser on the LCD unit is further focused together. -Generally, for example, printing methods, conveying methods, and the like are used to form a triangular pyramid or semi-cylindrical pattern with an apex angle of about 70 to 100 degrees on the surface of a cleaning sheet having a thickness of 1 mm or less. The pitch is about 20 ~ 150 yrn. More diamond lenses can enhance the brightness. However, because of the use of diamond lenses ------ this paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 594278 A7 -------- B7______ 5. Description of the Invention (12) The number of lenses will reduce the field of view, so one or two diamond lenses are generally used. The thermoplastic resin used for the protective sheet is generally used for the rhombohedral lens. Poly (ethyl terephthalate) and bisphenyl A polycarbonate are particularly preferable. 6. Stacking of sheets The general recommendation is to stack one or more protective sheets and polarizers with an adhesive or pressure-sensitive adhesive. Adhesives or pressure-sensitive adhesives require long-term durability to water, heat, light, and similar materials. Basically, it is not particularly limited as long as it satisfies the above-mentioned durability. For example, examples of the adhesive include isocyanate series' polyurethane series, polythiourethane series, epoxy resin series, vinyl acetate series, acrylonitrile series, and paraffin series adhesives. Examples of the 'pressure-sensitive adhesive' include vinyl acetate series and acrylonitrile pressure-sensitive adhesive. You can use commonly used coating methods, such as photo plate coating and offset coating, to uniformly apply adhesives and pressure-sensitive adhesives to polarizers, protective sheets, resin sheets, and diffuser sheets. Or diamond lens. The thickness of the adhesive layer or the sensitive adhesive layer is generally 〇 丨 ~ 丨 ⑼ " m, preferably 〇 $ ~ ⑽ " ㈤. When the thickness of the adhesive layer or the sensitive adhesive layer is less than 0.001 m, the bonding strength is low. On the other hand, when the thickness of the adhesive layer or the sensitive adhesive layer is more than 100 m, the adhesive layer or the sensitive adhesive layer may be peeled off from the edge surface of the light guide plate. In order to use the adhesive layer or the sensitive adhesive layer to strengthen the security of the sheet, the mouth strength of the above sheet can be used for example, such as acid, test and similar __ 15- This paper size Applicable to gg 豕 standards (CNs) μ specifications (⑽X 挪 公 爱)

Decoration% 594278 A7 V. Description of the invention (13 products of chemicals are processed. Using the preparation of the polarizing plate of the present invention, the agent or sensitive adhesive can be applied to the above-mentioned slave roller or after the cutting step and carried out. Curing treatment. I outside line or plasma, or arc discharge. On the matter or immediately before stacking, the adhesive sheets are stacked 'if necessary, directly with these sheets, 7. Polaroid hibiscus The preferred sheet structure of the polarizing plate of the present invention is as follows (1) protective sheet / polarizing sheet / resin sheet (2) protective sheet / polarizing sheet / protective sheet / resin sheet (3) diffuser sheet / polarizing sheet / Resin sheet (4) Astigmatism sheet / Protection sheet / Polarizer sheet / Resin sheet (5) Astigmatism sheet / Polarizer sheet / Protection sheet / Resin sheet Diamond Lens / Polarizer / Resin Sheet

Mounting (8) Rhombus lens / protective sheet / polarizer / resin sheet (9) Rhombus lens / polarizer / protection sheet / resin sheet (10) Rhombus lens / protection sheet / polarization sheet / protection sheet / tree moon purpose (11) ) Rhombus / Rhombus Lens / Polarizer / Resin (12) Rhombus / Rhombus Lens / Protection / Polarizer / Resin (13) Rhombus / Rhombus Lens / Protection / Resin (14) Rhombus / Rhombus / Protection sheet / Polarizer sheet / Protection sheet (15) Diamond lens / Astigmatism sheet / Polarizer sheet / Resin sheet sheet / Resin sheet

(16) Rhombus lens / Astigmatism lens / Protection lens / Polarizer / Resin film (17) Rhombus lens / Astigmatism lens / Polarizer / Protection film / Resin lens -16-

This paper size applies to China National Standard (CNS) A4 (210X 297 mm) 594278 A7

(18) Rhombus lens / Astigmatism lens / Protection lens / Polarizer / Protection film / Resin film (19) Rhombus lens / Rhombus lens / Astigmatism film / Polarizer / Resin film (20) Rhombus lens / Rhombus lens / Astigmatism film / Protection Sheet / Polarizer / Resin Sheet (21) Diamond Lens / Rhombus Lens / Astigmatism Sheet / Polarizer / Protector Sheet / Resin Sheet (22) v Seal 8 · Preparation of the light guide plate The method of preparing the side light type light guide plate by inserting the above-mentioned polarizing plate into the light guide plate will be explained below. The general methods of preparing a side-light type light guide plate include press forming, transfer forming, injection forming, and the like. From the viewpoints of productivity and accuracy, the insert injection molding method described in JP-A 11-245259 is basically the best. More specifically, this method includes placing a polarizing plate on the negative side of the cavity, with the surface of the polarizing plate to be thermally bonded facing inward, and then injecting resin onto the surface to form the resin layer. In particular, an insert-type injection press molding method is preferred. The injection pressure forming method rarely causes its forming product due to the internal forming strain and local orientation, because in the puppet method, the resin is injected into the cavity at a low pressure, and then The cavity is closed under practice and pressure is applied to the resin. In addition, the pressure of the cavities is applied to the resin while the resin can be cooled down with a fixed specific volume, so that a molded product with high dimensional accuracy can be obtained. The beaver method is particularly preferably used for polyurethanes exhibiting a large birefringence. The matrix resin used for the side-light type light guide plate used in the resin sheet is preferably -17-

594278 A7 B7 V. Description of the invention (15 The tree is the same 'because the matrix resin will be thermally bonded to the resin sheet of the polarizing plate. Here, the "same" resin refers to the same series that can be thermally bonded to each other. Resins, and resins with slight differences in composition and molecular weight are included in the same resin. As shown in Figures 1 and 2, there are systems using one cold cathode tube and two cold cathode tubes in the side-light type light guide plate. Fig. 1A shows a schematic perspective view of a side-light type light guide plate using a cold cathode tube, and Fig. 1B shows a vertical sectional view of Fig. 18. In this system, the 'light guide plate 1 includes a body 11 and a cold cathode tube. 12 and mirror 13, and similar units. The body 11 includes a diamond lens, a polarizer, a diffuser, and similar units. As shown in FIG. 1B, a pair of sides of the body 11 generally have a trapezoidal cross section, and a cold cathode tube Is placed on the edge surface 11a of the body 11 and the edge surface ila is on the longer bottom edge of the trapezoid. Fig. 2A shows a perspective view of a side light-type light guide plate using two cold cathode tubes, and the figure 2B display A vertical sectional view of FIG. 2A is shown. In this system, the 'light guide plate 2 includes a body 21, two cold cathode tubes 22, 22 and a reflector 23, and the like. The body 21 includes a diamond lens, a polarizer, a diffuser, and similar units. As shown in FIG. 2B, a pair of sides of the body 21 generally have a rectangular cross section, and the cold cathode tube is disposed on the edge surfaces 21a and 21b of the body 21, and the edge surfaces are on the opposite sides of the rectangle. The side-light type light guide plate of the present invention can be applied to a system using one cold cathode tube and a system using two cold cathode tubes. -18-

This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) 594278 A7 B7 V. Description of the invention (16 examples Then 'the invention will be specifically explained with reference to the examples, but the invention is not limited to this Example 1 A bisphenyl A polycarbonate having a polymerization degree of about 95 was used to prepare a polycarbonate sheet having a thickness of about 40. The two polycarbonate sheets obtained were used for a protective sheet and a resin sheet, respectively. Independent A polarizer having a thickness of about 40 m was prepared, and the polarizer was sandwiched between a protective sheet and a grease sheet and bonded together to form a polarizer. The obtained polarizer was cut into longitudinal edges 12 3 Guagua X A part with a width of 16.3 mm is inserted into the front cavity of the injection press molding machine, and then is fixed in the salty hole 2 by the suction of the air hole formed in the front cavity. The side of the force application side The part is fastened to the side of the cavity, and bisphenyl A polycarbonate with a polymerization degree of about 95 is used as the matrix resin. It is injection-molded into a tapered light guide plate with a longitudinal side of 12.3 mm and a transverse side of 16.3 mm. The thickness of the edge surface of the light guide plate attached to the cold cathode tube was 3 · i mm, and The thickness of the edge surface is 1.1 mm. The dot-shaped printing of the uniform reflection pattern on the back of the light guide plate obtained eliminates the need for one or two polarizing plates when assembling an LCD panel and can enhance its brightness. Example 2 Use A triacetate (TAC) sheet with a thickness of about 80 m is used as a protective sheet. A polarizer with a thickness of about 40 // m is stacked between two τ a C sheets to prepare a composite sheet. As a resin Polycarbonate sheet for tablets, with a thickness of about 400 A m 'is prepared by using polycarbonate with a polymerization degree of about 9 5. Polycarbonate sheet -19- --- This paper size is applicable to the country of China Standard (CNS) A4 specification (210X297 mm) 594278 A7 —_ B7 — V. On the other side of the invention description (17), use the acrylic pressure-sensitive adhesive manufactured by Saiden Chemical Co., Ltd. "SAIBINOL AT- 250, ', coated to a thickness of about 30 am. A resin sheet with a pressure-sensitive adhesive was placed on one side of the composite sheet to prepare a polarizing plate. Polycarbonate with a polymerization degree of about 95 was used as a substrate sheet. 'Injected and press-molded onto the resin sheet side of the polarizing plate of Example 1 to A light guide plate with a polarizing function is prepared. The dot-shaped printing of the uniform reflection pattern on the back of the obtained light guide plate eliminates the need for one or two polarizing plates when assembling an LCD panel, and can enhance its brightness. Example 3 Thickness About 80 // n ^ 々 TAC sheet is used as a protective sheet. A polarizing sheet with a thickness of about 40 mm is stacked between two TAC sheets to prepare a composite sheet. Poly (methyl) as a resin sheet Methyl acrylate) sheet, about 400 m thick. On the other side of the polycarbonate sheet, an acrylic pressure-sensitive adhesive "SAIBINOL AT-250" manufactured by Saiden Chemical Co., Ltd. was applied to a thickness of about 30 m. The resin sheet of the agent is bonded to one side of the composite sheet to prepare a composite sheet with a resin sheet attached thereto. Polycarbonate having a polymerization degree of about 95 is used as a matrix sheet and is injection-molded to I The light guide plate with polarizing function is prepared on the side of the resin sheet of the polarizing plate in Example 1. The light diffusing sheet having a thickness of about 100 m is prepared using poly (ethyl terephthalate). The thickness is 200 m m and a polycarbonate sheet with a degree of polymerization of about 95 on one side of the polycarbonate sheet 'forms a v-groove array with a pitch of about 50 " m to prepare a diamond lens with an equiangular angle of 90 degrees. From the above diamond lens Cut out two pieces so that the direction of the V-shaped grooves on the two pieces will form a right angle. On the resin side of the composite sheet laminated with the resin-20-594278 A7 B7 V. Description of the invention (18) , The astigmatism sheets are superimposed together, and then the Mitsubishi lenses are further superimposed together so that the The direction of the V-shaped grooves on the sheet will form a right angle. These sheets are bonded to a "SAIBINOL AT-250" layer with a thickness of about 30. The dot pattern printing of the uniform reflection pattern on the back of the light guide plate, Eliminates the need for one or two polarizers, astigmatism lenses, and two-Mitsubishi lenses when assembling an LCD panel, and enhances its brightness. -21-This paper size applies to China National Standard (CNS) A4 (210X297 mm)

Claims (1)

W4278 No. 090123468 ~ Study Cases…, —, j-filed patent application I substitute ^^ one, I 1. Shou: A light guide plate, characterized in that it is formed with a polarizing plate by wide forming method inside the light guide plate; the polarizing plate is a composite sheet including white light II and a resin sheet, and the resin sheet is used to form a light guide plate: The matrix resin is made of the same resin, and the matrix resin and the resin sheet are both thermally bonded by insert molding. For example, the side-light-type light guide plate in the scope of the application for a patent, wherein the polarizing plate is a composite sheet having 3 or more thin layers, and the composite sheet includes at least a diffusion sheet, a polarizer, and a resin sheet, and the resin The sheet is made of the same resin as the matrix resin constituting the light guide plate, and both the matrix resin and the resin sheet are thermally bonded by insert molding. j. 4. The side-light type light guide plate according to item 1 in the scope of the patent application, wherein the polarizer is a composite sheet with 3 or more thin layers, and the composite sheet includes at least a diamond lens, a polarizer, and a resin. The resin sheet is made of the same resin as the matrix resin constituting the light guide plate, and the matrix resin and the resin sheet are thermally bonded together by insert molding. For example, the side-light type light guide plate of the first item in the scope of the patent application, wherein the polarizing plate is a composite sheet having 4 or more thin layers, and the composite sheet includes at least a diamond lens, a diffuser, a polarizer, and a resin sheet. The resin sheet is made of the same resin as the matrix resin constituting the light guide plate, and the matrix resin and the resin sheet are thermally bonded together by insert molding. For example, the side-light type light guide plate of any one of items 1 to 4 in the scope of the patent application, wherein the matrix resin constituting the light guide plate is selected from poly (meth) acrylate, polycarbonate, polyamide, polyester And a group of resins having a gold steel alkyl group or a cyclopentyl group on the main chain, wherein the main chain is a hydrocarbon. This paper size applies to China National Standard (CNS) Α4 size (210X 297 mm). Η