TW201107838A - Liquid crystal display device - Google Patents

Abstract

The present invention provides a liquid crystal display device which comprises an area light source and a liquid crystal panel arranged on the area light source, the liquid crystal panel comprising a liquid crystal cell and a polarizing plate laminated on the area light source side surface of the liquid crystal cell, wherein the polarizing plate comprises a polarizing film and a prismatic sheet having a surface formed of prismatic protrusions, the prismatic sheet being such arranged that the surface formed of the prismatic protrusions opposes to the area light source, wherein light intensity distribution of emitting light of the area light source within a plane which is orthogonal to a prismatic direction of the prismatic protrusions satisfies the following inequality (1): A2/A1> 10 (1) [Wherein A1 is an average light intensity of emitting light in the range of 0 DEG to x of emitting angle θ , if an angle formed by a normal direction to a light emitting surface of the area light source and an emitting direction of the emitting light of the area light source is defined as emitting angle θ , and A2 is an average light intensity of emitting light in the range of x to 80 DEG of emitting angle θ , wherein x is an angle (DEG) satisfying a predetermined relationship.] Thereby, the present invention provides a liquid crystal display device having high brightness and contrast, and having excellent display proprieties.

Description

201107838 VI. Description of the Invention: [Technical Field of the Invention] Liquid crystal screen, personal computer, etc. The present invention relates to a liquid crystal display device for a liquid crystal television. [Prior Art] = Packing: As a use for LCD TVs, the use of human power ==τ is rapidly expanding. In particular, the market for LCD TVs is expanding. In addition, the requirements for cost reduction are as follows: The device is composed of: a cold cathode source, a light diffusing plate, one or a plurality of diffusing sheets, a set, a piece of U, and a bonding. "Panels with polarizing plates. In recent years, in the use of wall-mounted large-density LCD TVs, etc., due to the emergence of a liquid crystal display device, in this case, in order to achieve a thin liquid crystal display device It is necessary to thin the members of the liquid crystal display device and reduce the number of components. For such a demand, there is known a technique for removing one or a plurality of members to reduce the number of parts by the following method: A prism sheet having a condensing property is directly followed by a method of arranging a polarizing plate between a liquid crystal cell constituting a liquid crystal panel and a surface light source (for example, JPH11-295714-A and JP2008-) 262132-A), I use a light-collecting sheet as a protective film for a polarizing plate disposed on the surface light source side of a liquid crystal panel (for example, JP2008-262132-A and JP2005-17355-A). In the liquid crystal display device using a polarizing plate having a sheet member such as a prism sheet, such as a prism sheet, 3 3々12〇201107838, depending on the light emission characteristics of the surface light used, the sheet member is not expected to be sufficiently exhibited. In the case of the annual light* function, the display characteristics such as brightness and contrast are degraded. [Invention] The present invention has been developed to solve the above problems, and the present invention provides a high brightness and contrast and excellent display characteristics. The present invention relates to a liquid crystal display panel, and a liquid crystal panel comprising a liquid crystal cell and a polarizing plate laminated on a surface of the liquid source on the surface light source. In the device, the polarizing plate is provided with a polarizing film; the surface formed by the beak-like protrusions is opposite to the surface light source: the vertical crystal display device 'before the ridgeline direction of the conical protrusions (1): (10) The first intensity distribution satisfies the following Α2/Α1&gt;1〇(1). In the second material (1), 'A1 m is described in the plane of the two-disk, the plane of the 稜鏡-shaped protrusion, which will be emitted by the surface light source. The direction of the normal direction of the surface and the direction of the exit light of the surface light source are 射 (only 〇. with $9〇.) The angle of time is also the angle of the exiting light of the exit angle (4) The angle 0 is at "to X" In the range of (4) the first thousand first intensity; A2 is the average light intensity of the emitted light in the exit angle. This 8° = the angle of the relationship (.)·· is 322120 5 201107838 sina that satisfies the following formula (2) /[sin(180o-a_2x)/2] = n (2) Here, in the above formula (2), α represents the vertex angle of the dome-like protrusion, and π represents the refractive index of the prism-shaped protrusion. In the liquid crystal display device of the present invention, the surface light source is preferably composed of a light guide plate and a light source device disposed on the side of the light guide plate. Further, the light source device is preferably a light source device in which a point light source is linearly arranged or a light source device composed of a rod-shaped light source, and the light source device and the cymbal blade are preferably arranged such that the light source device and the dome-like projection are The ridgelines are parallel or approximately parallel. In the liquid crystal display device of the present invention, it is preferable that the surface light source has a device disposed on the side of the light guide plate or two light source devices disposed on opposite sides of the light guide plate. The apex angle α of the dome is preferably 60. the above. Further, the cross-sectional shape of the braided shape is preferably a equilateral triangle. The liquid crystal display device of the present invention has a high brightness and contrast while being thinned, and is excellent in display characteristics. The liquid crystal display device of the present invention can be applied to a liquid crystal display device for a large-surface liquid crystal television, in particular, a liquid crystal display device for a wall-mounted liquid crystal television. [Embodiment] Fig. 1 is a schematic cross-sectional view showing a preferred embodiment of a liquid crystal display device of the present invention. The liquid crystal display device 100 shown in Fig. J of the present invention is composed of a light guide plate 22 and a surface light source 20 of the light source device 21 disposed along one side of the light guide plate 22 on the side of the light guide plate 22; The liquid crystal panel 1 on the surface light source 20 is turned on. The liquid crystal panel 1 is composed of the following: 322120 6 201107838, U70 3 ; a polarizing plate 1 which is laminated on the surface side polarizing plate of the surface of the liquid crystal cell 3 on the surface of the light source 20α; and a polarizing plate 2 The surface side polarizing plate is laminated on the side of the visual side of the & The polarizing plate 1 and the polarizing plate 2_domain layer are bonded to the liquid crystal cell 3. The polarizing plate 1 belonging to the moon-side polarizing plate includes a polarizing film 12, and a prism sheet 13 which is laminated on the surface of the surface of the polarizing film 12 via the adhesive layer 14. The lens 13 has a dome-like projection 13a. The surface (hereinafter referred to as "mirror surface") is a resin film laminated on the visual side surface of the polarizing film 12 via the adhesive layer 16. , hire 15. The partial first plate 1 is attached to the liquid helium sheet by the resin film 15 side, and more specifically, the liquid crystal cell 3 and the polarizing plate 1 are opposite to the surface of the polarizing film 12 which is laminated with the tantalum sheet 13 The side surface phase is bonded to the liquid crystal cell 3", that is, in the manner of "the surface of the surface light source side of the ηr-rectifier liquid crystal panel 1G, and the surface of the surface is 2G" Make a fit. Further, in the film 12 η Z polarizing plate of the present invention, the resin film may not be provided, and the polarizing film 12J or the ridge layer may be directly bonded to the liquid crystal cell 3. The polarized light; s ', the liquid crystal display device of the present invention is a rear surface == crystal display device, wherein the back side polarizing plate has a prism sheet which is layered on the surface of the first chess, and is formed as follows. A surface light source that has a shape-like protrusion (which kind of banknotes) having a specific light-emitting property (specifically, in which direction the light is emitted according to the present invention). Root S] Liquid crystal display device, two types of liquid crystal display devices using 背面, /, which have excellent display characteristics with high brightness and contrast, using a back side polarizing plate having a cymbal sheet. Further, since the liquid crystal display device of the present invention includes a liquid crystal panel in which a polarizing plate that has been reduced in thickness is bonded to the back surface side of the liquid crystal cell, it is possible to achieve a reduction in thickness and sufficient mechanical strength, and at the same time, Since it is disposed on the back side of the liquid crystal panel, it is possible to prevent the liquid crystal panel from coming into contact with the surface light source, thereby achieving an improvement in display characteristics. Hereinafter, the liquid crystal display device of the present invention will be described in detail with reference to the drawings. <Back Side Polarizing Plate> Fig. 2 is a schematic cross-sectional view showing a preferred example of the back side polarizing plate of the present invention, and the configuration is the same as that of the polarizing plate 第 in Fig. 1 (the same symbol is used). In the example shown in FIG. 2, the back side polarizing plate of the present invention includes at least a polarizing film 12, and a ruthenium laminated on the one-side surface (surface light source side surface) of the polarizing film 12 via the adhesive layer 14, the cymbal sheet. 13 has a surface (facet) composed of a beak-like projection 13a. In the polarizing plate 1 shown in FIG. 2, the back side polarizing plate may include a resin film 15 which is laminated on the surface (surface on the liquid crystal cell side) on the side opposite to the surface on which the wafer 13 is laminated via the adhesive layer 16. . (Polarizing film) Specifically, the polarizing film 12 used for the back polarizing plate is obtained by adsorbing a dichroic dye to a polyvinyl alcohol-based resin film which has been uniaxially stretched. A polyvinyl alcohol-based resin constituting a polyvinyl alcohol-based resin film can be obtained by saponification using a polyvinyl acetate-based resin. In the case of the polyvinyl acetate-based resin, in addition to the polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable with vinyl acetate, such as ethylene, may be mentioned. - a vinyl acetate copolymer or the like. Other monomers which can be copolymerized with vinyl acetate 322120 8 201107838 can be exemplified by unsaturated ships such as ethers, unsaturated (four) _ 'caps of C__, etc. The degree of deuteration of the polyethylene glycol is usually about 85 to fresh grass dew / (mole%), preferably 98 mo #, 0 change temporarily to w material% or more ^ B_ resin It is also possible to use an aldehyde-modified polyethylene acetal P〇yvinyl for.al) ^ 6^ (p〇lyvinyi ^ polymerization == one pass ^ is about just ^ to just (10), preferably about The method of forming a film of such a polyglycol-based resin is used as a film of a polarizing film. The method of forming a film of a polyethylene glycol-based resin is not particularly limited, and can be carried out by a conventionally known suitable method. The film thickness of the raw material film formed of the polyvinyl alcohol-based resin is not particularly limited, and for example, about 150 to 150 &quot; m 〇 polarizing film is usually produced by the following steps: polyethylene glycol as described above The raw material film formed by the phyla &amp; is dyed with a dichroic dye*, and the dichroic dye is attached (staining treatment step); the polyvinyl alcohol-based resin film to which the dichroic dye is adsorbed is boric acid The step of treating the aqueous solution (the boric acid treatment step and the step of washing with water after the treatment by the sensible aqueous solution (washing) Step )«ι sg 四其他' At the time of manufacturing the polarizing film, usually the polyvinyl alcohol resin film is extended early, and the sharp axis extension can be performed before the dyeing process step, and is also carried out in the dyeing process step + It is also possible to carry out the extension of the section after the treatment step, which can be carried out before the borax treatment step, or in the succinic acid treatment step 322120 9 201107838. Of course, Uniaxial extension can also be performed at these multiple stages. Single axis

Ht* is carried out in a way that the circumferential speeds are different (r. (1) extends toward a single axis, and also by using a hot roller to extend toward a single axis. In addition, it can be extended in the atmosphere. The dry stretching may be carried out by a wet stretching in which the film is swollen in a solvent. The stretching ratio is usually about 3 to 8 times. In the dyeing step, the polyvinyl alcohol resin film is in a dichroic color. The dyeing by t can be carried out, for example, by submerging a polyvinyl alcohol-based resin film in an aqueous solution containing a dichroic dye. For example, one color, raw wood, or the like can be used as the dichroic dye. The dichroic dye may include 'disaz〇 compound such as CI DIRECT 39, one color direct dye; triazo (6) coffee), tetrazonitride = color dye. Further, the 'polyvinyl alcohol-based resin film was subjected to impregnation treatment with water before being subjected to the tan color treatment. In the case of using = as a dichroic dye, a method of dyeing a polyethylene resin film in an aqueous solution containing moths and deuterium is usually employed. In the aqueous solution, the content of the dish is usually from about (5) to about 20 parts by weight per (10) of the (four) containing material. Use moths as a dichroic color. The temperature of the aqueous solution used for dyeing is usually 2 Torr to the boot, and the immersion time (dyeing time) in the aqueous liquid is usually 20 322 120 10 201107838 in an aqueous solution of a dye dye for dyeing. In the aqueous solution, the content of the color-developing dye is usually from 1 x 10 to 10 parts by weight per 1 part by weight of water, preferably parts by weight, particularly preferably from 3 to X parts by weight. The aqueous solution may also contain an inorganic salt such as sodium sulphate as a dyeing aid. In the case where a dichroic dye is used as the dichroic dye, the temperature of the dye aqueous solution used for dyeing is usually 20 to 80 Å, and further, the immersion time (dyeing time) immersed in the aqueous solution is usually 1 〇 8 〇 8 〇 Leap second. The human-to-meal processing step is carried out by immersing the polyethylene-based resin film dyed with the dichroic dye in an aqueous solution containing an alcohol to carry out the acid in the surface of the acid, and the amount of money is (4) per (10) parts by weight. The water is in parts by weight, preferably 5 to 12 parts by weight. In the case where hydrazine is used as the dichroic dye in the above dyeing treatment, the aqueous solution containing the acid used in the sulphuric acid treatment step preferably contains (4) cut. In this case, the amount of potassium telluride in the aqueous solution containing the meal is usually from 0.1 to 15 parts by weight, preferably from 5 to 12 parts by weight, per 100 parts by weight of the water. The impregnation time in the aqueous solution containing the meal is usually from 60 to 2 seconds, preferably from 50 to 600, more preferably from 2 to shed. The temperature of the aqueous solution containing the acid is usually 5 (TC or more, preferably 5 Torr to 85 Torr to 80 ° C. In the subsequent water washing treatment (4), « the polyvinyl alcohol resin film treated by the above (4) is impregnated For example, a water towel* is subjected to a water washing treatment. In the water washing treatment, the temperature of the water is usually 5 to scratch, and the dipping (four) is usually 120 seconds. After the water washing treatment, drying treatment is usually performed to obtain a polarizing film. (4) If the hot air blower 'far infrared ray 322120 201107838, etc., the drying treatment temperature is usually more, preferably 50 to sot. The drying treatment time is ± ± horse, hanging 60 to 600 seconds 'better For i2f) to 600 seconds. In this manner, the polyephthyl alcohol resin film is subjected to uniaxial stretching, dyeing, treatment, and water washing treatment using a coloring dye to obtain a polarizing film. The thickness of the polarizing film is usually 5 to 4 (b). The crotch sheet 13 for the back side polarizing plate has a surface composed of a beak-like projection (a dome-like projection 13a) (re-mirror surface). . The crotch panel 13 is laminated on the polarizing film 12 so that the surface opposite to the crotch surface faces the polarizing film 12. By arranging the crotch surface ι3 on the surface of the back side polarizing plate, the kneading surface is opposed to the surface light source described later, and the light exit surface from the surface light source can be intentionally changed (relative to the side of the prism surface) Face) The direction of the light that is emitted. According to the present invention, the light emitted from the surface light source, in particular, the light having the directivity can be emitted by the above-mentioned cymbal sheet [the main emission direction is the normal direction of the light exit surface of the surface light source (the front surface of the liquid crystal display device) The direction in which the light is emitted in a different direction is deflected toward the front direction of the liquid crystal display device, thereby increasing the brightness and contrast of the front surface of the liquid crystal display device. Further, the cymbal sheet 13 also functions as a protective film for the polarizing film 12. Here, the "bow-like protrusion" is intended to mean that a triangular shape (which may be included in a part of a slightly triangular shape, a zigzag shape or the like including a curve) is displayed in a direction parallel to a direction perpendicular to the surface of the triangular shape. a portion of the columnar body that is sandwiched between the sides (ridge lines) that do not form the two sides of the bottom surface (the diagonal of the bottom edge of the angular shape of the three 12 322120 201107838); the facet is relative to the column The surface of the ridge-shaped protrusion (the trajectory of the bottom edge of the triangular shape) is a bottom surface, and a plurality of the columnar bodies are closely connected in parallel and arranged, and the plurality of ridges are oriented in a single direction. (Arranged such that the ridgelines of the respective projections are parallel or slightly parallel). Fig. 3 is a schematic perspective view showing an example of the surface shape of the cymbal, and the cross-sectional shape of the ridge is a trapezoidal triangle. The crotch panel 13 may be, for example, 30 to 100 in the apex angle (the angle of the apex) of the serpentine projection 13a. In the present invention, it is particularly preferable that the light emitted from the surface light source, particularly the light having the directivity, be deflected more toward the front direction of the liquid crystal display device, and is preferably 60 or more and 100. Hereinafter, it is more preferably 60. Above, below 80°. The height of the beak 13a may be, for example, 100 to m. Further, the pitch of the beak-like projections 13a (the distance between the ridgelines of the adjacent projections) is appropriately determined in consideration of the vertex angle and height of the condylar projections 13a, for example, may be 5 to 300. // m. The two sides of the protrusion in the triangular shape of the brake surface forming the dome 13a may be the same length or may have different lengths, but at least the light source device of the surface light source used is disposed on both sides of the face of the light guide plate. Preferably, the two sides are of the same length, and therefore, the cross-sectional shape of the beak-like projection 13a is preferably a equilateral triangle. The heights of the plurality of braided projections 13a may all be the same or different. Further, the shape of the groove formed between the protrusions may be a straight line or a curved line. Various materials known in the art can be used as the material of the cymbal sheet 13. For example, 丨322120 13 201107838 may use a polyolefin resin such as polyethylene or polypropylene; a polyester resin such as a poly(p-dimethyl ester) resin or a polyethylene naphthalate resin; a polyethylene resin; 'Polycarbonate resin, norbornene based resin, polyurethane resin, acrylic resin, polymethyl propylene@methyl ester resin, polystyrene resin, decyl methacrylate - stupid B A synthetic polymer such as a rare copolymer, an acrylonitrile-butadiene-styrene copolymer, an acrylonitrile to a stupid ethylene copolymer, or a natural polymer such as a cellulose diacetate resin or a cellulose triacetate resin. Among them, from the viewpoints of transparency, moisture permeability, and productivity, it is suitable as a polyolefin resin, a polyacrylic resin, a polycarbonate resin, a poly-radiation resin, a polystyrene resin, or a methacrylate. A thermoplastic resin of any one of a benzene% styrene copolymer, an acrylonitrile-butadiene-styrene copolymer, and an acrylonitrile-styrene copolymer. Further, if necessary, these polymer materials may contain an ultraviolet absorber, an antioxidant, a plasticizer or the like. In the case of using the above-mentioned transparent polymer material as a base material, the spear lens 丨 3 is a photopolymer manufacturing method, a profile extrusion method, a press molding method, an injection molding method, and a drum rotation. It is manufactured by a known method such as a printing method, a laser ablation method, a mechanical cutting method, or a chipping method. These methods may be used individually or in combination of two or more methods. The thickness of 稜鏡 = 13 is not particularly limited, but is from the point of the polarizing plate. Preferably, it is about 20_ or more, 200 is less than m, and 3〇#m or more and 1〇〇/zm or less. Thinner walling is more preferably (resin film) 322120 14 201107838 ..t Fig. 2 shows the _ child's face on the opposite side of the facet 12 with the laminated face, and can also be laminated to protect the 祺 or optical compensation Resin such as film' film 15. In this case, the polarizing plate 1 is attached to the liquid crystal cell by the adhesive layer laminated on the resin film 15. In addition, the optical layer may be applied to the fine layer 12, or the light film or the optical compensation film. Examples of the resin crucible 15 include a cellulose resin film such as cellulose triacetate (6) (10), and a hydrocarbon resin film, an acrylic resin film, a polyethylene terephthalate, and the like. Poly" is a resin film or the like. The cellulose-based resin constituting the cellulose-based resin film may, for example, be a partially esterified or fully esterified cellulose, for example, cellulose acetate, propionate, butyrate, or a mixed ester thereof. More specifically, examples thereof include cellulose triacetate, cellulose diacetate, cellulose acetate propionate, cellulose acetate butyrate, and the like. When such a cellulose-based resin is formed into a film as a film, a known method such as a solvent casting method or a melt-casting method is preferably employed. Commercial products of the cellulose ester-based resin film include "Fuji Tac TD80" (manufactured by Fujifilm Co., Ltd.), "Fuji Tac TD80UF" (manufactured by Fujifilm Co., Ltd.), and "Fuji Tac TD80UZ" (Fuji Tray) )), "KC8UX2M" (manufactured by Konica Minolta Opto Co., Ltd.), "KC8UY" (manufactured by Konica Minolta Precision Optics Co., Ltd.). In addition, the optical compensation film formed of the cellulose resin film may include a film containing a compound having a phase difference adjustment function in the cellulose resin film; and the surface of the cellulose resin film may be adjusted with phase shading. The optical compensation film made of a cellulose-based resin film, such as a uniaxially stretched or biaxially stretched cellulose resin film, such as a compound of 322120 15 201107838, can be exemplified. "WV BZ 438" and "wv ΕΑ" made by ^ ρ ^ film (share); Konica Minolta ##, "KC4FR-1" and "KC4HR" manufactured by Xiong's φ Optical Co., Ltd. -1" and so on. The thickness of the protective film or the optical compensation film formed by the 处 ' 料 料 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有 没有It is. In the case where the thickness is less than 2 〇, the film may be... 万. ^Wan surface 'In the case where the thickness exceeds 90 # m, the processing θ is disadvantageous because the above-mentioned polarizing plate is thinned and lightened. 00 The optical compensation film formed of the above-mentioned polyolefin-based resin film may, for example, be a hydrocarbon resin film which is elongated or biaxially stretched. It is applied to a large liquid: 曰: TV: crystal panel (especially with vertical alignment) In the case of (VA) mode liquid crystal=70 liquid aa panel), from the viewpoint of optical properties and durability, an extension of the enamel-tree decidua film is also suitable as the optical compensation film. The "resin film" refers to, for example, a film composed of a plastic resin having a monomeric monomer: a ring-shaped rare hydrocarbon (cycloolefin) such as a norbornene or a fluorene-norborning monomer. The cycloolefin resin film may be a hydrogenated product of a ring-opening polymer using a single ring-dilute hydrocarbon, or a hydride of a ring-opening copolymer of two or more kinds; a ring-opening copolymer of k; And/or an addition copolymer having an aromatic compound such as an ethylene group. In addition, it is also effective to have a polar base in the main chain or side chain. Commercially available thermoplastic ring-type hydrocarbon resin is "T_s" sold by the German TGPAS ADVANCED POLYMERS GmbH, 16 322120 201107838 "ART0N" sold by JSR (shares), and "ZE0N0R" sold by Japan Ze〇n (shares) "APEL" ("MEEL" (all product names) sold by ZEONEX and Mitsui Chemicals Co., Ltd., etc., are used appropriately. The cycloolefin resin is formed into a film to obtain a cycloolefin resin film. A known method such as a solvent casting method or a melt extrusion method is preferably used as the crucible method. In addition, "Escena" and "SCA40" sold by Sekisui Chemical Industry Co., Ltd., "ZE0N0R臈" sold by Japan Zeon (shares), and "ART0N film" sold by JSR (shares) are also sold in the market. Each of the cycloolefin-based resin films which have been formed into a film, such as a product name, may be suitably used. When the thickness of the optical compensation film composed of the extended cycloolefin resin film is too thick, the workability is deteriorated, and the transparency is lowered, or the thickness of the polarizing plate is reduced and the weight is reduced. Therefore, it is preferably about 2 to 80 m. The back side polarizing plate used in the present invention can be obtained by laminating a top sheet to the one side surface of the above polarizing film by using an adhesive. Thereby, a polarizing plate obtained by laminating the ruthenium sheet 13 on the surface of the polarizing film f via the adhesive layer 14 is obtained. In the case where the tree 15 is laminated on the surface of the polarizing plate 12, the bonding of the polarizing film 12 and the resin film 15 is performed in the same manner as the bonding agent, and then the bonding is carried out, and then the film is bonded to the polarizing film. In the case of 12, the bonding agent for the crotch sheet i3 and the bonding agent for the lamination 15 may be of a different type of adhesive. Intimate for use in such enamel: A water-repellent agent, that is, an adhesive in which an adhesive component is dissolved or yellowed, and a photocurable adhesive is used. 322120 17 201107838 From the viewpoint of making the adhesive layer thin, it is preferred to use the above aqueous binder. The water-based adhesive can be, for example, a water-based adhesive using a polyvinyl alcohol-based resin or an urethane resin as an adhesive component. In the case where a polyethylene glycol-based resin is used as the adhesive component, the polyvinyl alcohol-based resin may be a thiol-modified polyvinyl alcohol or a acetonitrile-modified polyvinyl alcohol in addition to a partially saponified polyvinyl alcohol or a fully saponified polyvinyl alcohol. A modified polyvinyl alcohol-based resin such as a thiol-modified polyethylene glycol, a methyl-modified polyvinyl alcohol, or an amine-modified polyvinyl alcohol. Usually, a water-based adhesive containing a polyvinyl alcohol-based resin as an adhesive component is prepared into an aqueous solution of a polyvinyl alcohol-based resin. The concentration of the polyvinyl alcohol-based resin in the water-adhesive agent relative to 100 parts by weight is usually from about 1 to 10 parts by weight, preferably from about 1 to 5 parts by weight. In the adhesive agent containing a polyvinyl alcohol-based resin as an adhesive component, a curable component such as glyoxal or a water-soluble epoxy resin or a bridging agent is preferably added in order to improve adhesion. In the case of the water-soluble epoxy resin, for example, by reacting a polyalkylene p〇lyamine such as a polyethylenetriamine or a triethylenetetramine with a dicarboxylic acid such as adipic acid, The polyamine polyamine epoxy resin obtained by reacting epichlorohydrin in the obtained polyamide polyamine. Commercial products of such polyamine polyamine epoxy resins include "Sumiraze resin 650" and "Sumirazerasin 675" sold by CHEMITEX, and "WS-525" sold by Japan PMC (shares). . The amount of the curable component or the bridging agent added (in the case of co-addition is a total amount) is usually from 1 to 100 parts by weight, preferably from 1 to 50% by weight based on 100 parts by weight of the polyvinyl alcohol-based resin. Share. In the case where the amount of the curable component and the bridging agent added is less than 100 parts by weight of the polyvinyl alcohol-based 322120 18 201107838 parts by weight, the amount of the second curing agent, the second curing agent, and the bridging agent having a small adhesion improving effect is small. The I vinyl alcohol-based resin which is heavily scratched with respect to (10) tends to be embrittled more than 100% by weight of the adhesive layer. In addition, in the case of using an amine ester resin as an adhesive component, examples of a suitable adhesive composition may be exemplified by an ionic polymer type amine vinegar resin and a glycididylQXy group. a mixture of compounds. Here, the "polyacetate-based ionic polymer-type amine-brick resin" is an amine-based resin having a vinegar skeleton, and a small amount of ionic component (10) water component is introduced into the skeleton. Since the plasma polymer type (tetra) resin is directly emulsified into an emulsion in water without using an emulsifier, it is suitably used as a water-based adhesive. For example, Japanese Laid-Open Patent Publication No. 7J7504 discloses an example of a polymer dispersant for dispersing a viscous resin in an aqueous medium, and JP-A-2005-81817 discloses a mixture of a polyester-based ionic polymer-type amine vinegar resin and a compound having a glycidoxy group as an adhesive, and a ring is disclosed. The thin hydrocarbon resin film is bonded to a polarizing film made of a polyethylol alcohol resin. As a method of applying an adhesive to a polarizing film and/or a member (a sheet, a protective film, or an optical compensation film) bonded to the polarizing film, it is preferable to use a conventional method, such as a casting method. , Meyer bar coat method, gravure coating method (gravure c〇at also (6), comma Coater method, to knife forming method (d〇ct〇r blade method) ), die coating method (die c〇at meth〇d), impregnation coating 19 322120 201107838 dip coat method, spray method, etc. The so-called "casting method" is to belong to the coated object a method in which the film is moved in an approximately vertical direction, an approximately horizontal direction, or a skew direction therebetween, while allowing the adhesive to flow down and spread on the surface of the film. After applying the adhesive, the polarizing film and the bonding film are attached thereto. The member overlap of the polarizing film is sandwiched by a nip roller or the like to bond the film. For example, the bonding of the film using the roll may be performed by using a roller or the like after applying the binder. a method of uniformly adding a dust by applying dust; after applying the adhesive, passing In the former case, metal or rubber can be used as the material of the roller. In the latter case, the plurality of rollers can be the same material. After the above bonding, the polarizing plate can be obtained by drying the adhesive layer by drying. The drying treatment can be carried out, for example, by blowing hot air, and the drying treatment temperature is usually 40 to 1 Torr. In the range of 〇c, it is preferably in the range of 6 〇 to 1 〇〇 C. In addition, the drying time is usually 2 〇 to 1200 sec. The thickness of the adhesive layer after drying is usually 〇 1 to 5 am, It is preferably from 0.01 to 2 # m, more preferably from 1 to 1. In the case where the thickness of the adhesive layer after drying is less than 0.001 / / m, there is a concern that it becomes insufficient subsequently, and if it is dry, When the thickness of the adhesive layer exceeds m, there is a concern that the appearance of the polarizing plate may be poor. Further, before drying and curing, the thickness of the adhesive layer after bonding using the above-described roll or the like is preferably 5 #m or less. , preferably 0. 01 / zm or more. After drying, it can also be The temperature above room temperature is applied for at least half a day, usually more than one day, to obtain sufficient adhesion strength. 322120 20 201107838

• Type ^ The temperature at which the aging is wound into a roll is 30 to 50.益的益R, the ripening temperature exceeds 5 (TC, in the range of 35 to the muscle. If the raw ^ "volume_like". In addition, the humidity when cooked is not particularly limited ^ = = humidity is about. _ to _ The aging time is about 1 day to 10 days, preferably about 2 days to 7 days. The above photohardenable adhesive may, for example, be a photocurable cycloaliphatic and photopolymerization initiator. A mixture of photocurable epoxy resin, such as a 13⁄4 type earth oxide resin, an epoxy resin having no alicyclic structure, a mixture thereof, etc. A photocurable adhesive is other than a photocurable epoxy resin. It may also contain a bupropion acid resin, an oxime xetane resin, an amine vinegar resin, a polyethyl alcohol resin, or the like, and may also contain a photocationic polymerization initiator and photoradical polymerization. The photo-radical polymerization initiator may be contained in the form of a photo-curable adhesive instead of the photo-cationic polymerization initiator. In the case of using a photocurable adhesive, a photocurable adhesive is applied to the polarizing film and/or a member bonded to the polarizing film (strip, or protective film or optical compensation) After the polarizing film and the member bonded to the polarizing film are bonded together, the photocurable adhesive is cured by irradiation of the active energy ray. The method of applying the photocurable adhesive and the bonding method of the film The light source of the active energy ray is not particularly limited, but is preferably an active energy ray having a light-emitting distribution at a wavelength of 400 nm or less. Specifically, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, or the like is preferably used. Ultra high pressure mercury lamp, chemical lamp, black iight iamp, microwave excited mercury lamp, metal halide lamp, etc.

[SI 322120 21 201107838 The photo-hardening n and (4) light irradiation intensity are not particularly limited, and are determined appropriately by the composition of the root human I π/adhesive agent, but it is preferred to activate the polymerization initiator to the right t wavelength. In the case where the irradiation intensity of the field is 4 0.1 until the reaction time is not excessive and the degree is 0.1 or more, in the case where the irradiation intensity is 60 〇〇mw/cm 2 or less, the heat emitted from the light source is lightly emitted. When the photocurable adhesive is hardened, the problem of yellowing of the epoxy resin or deterioration of the polarizing film by Uxa is less. The light irradiation time of the photocurable adhesive is not particularly limited, and is controlled by a cured photocurable adhesive. However, the optimum amount of light (the product of the above irradiation intensity and the irradiation time) is 10 诵〇 _. In the case where the cumulative amount of light irradiated to the photocurable adhesive is 0 mJ/m or more, 'a large amount of activity derived from the polymerization initiator can be generated, and the hardening reaction can be more surely rided, corrected, and cured in light. In the case where the accumulated light amount of the vapor entering lamp is less than or equal to l_GmJ/m2, the ejaculation time is not too long, and good productivity can be maintained. The hardening of the second agent is preferably carried out under the condition that the polarizing degree, the transmittance and the hue of the polarizing film, and the functions of the polarizing plate such as the ribs, the protective film, and the optical leakage are not lowered. Before the ruthenium film and the protective film or the optical compensation film are attached to the polarizing film, in order to increase, (4), the surface of the rotating surface and/or the member attached to the polarizing film is subjected to plasma treatment, corona treatment, ultraviolet irradiation. Surface treatment such as treatment, flame treatment, deuteration treatment, etc. As the saponification treatment, for example, a method of immersing in an alkaline aqueous solution such as sodium oxynitride or hydrogen chloride detachment 322120 22 201107838. Further, as described above, the back side polarizing plate Can also have An optical functional film laminated on the surface of the polarizing film 12 opposite to the surface on which the prism sheet 13 is laminated. The optical functional film may be optically compensated by applying a liquid crystal compound to the surface of the substrate. a reflective polarizing film that transmits certain types of polarized light and reflects polarized light having the opposite property to the polarized light; a retardation film composed of a polycarbonate resin; a retardation film composed of a smoke-based resin film; a film having an anti-glare function having a concave-convex shape on the surface; a film having a surface anti-reflection function; a film having a reflective function on the surface and both reflecting function and penetrating A commercially available semi-transparent reflection film, etc., which is a commercially available product of an optical compensation film obtained by coating and aligning a liquid crystal compound to a surface of a substrate, may be, for example, a "WV film" (manufactured by Fujifilm Co., Ltd.). "NH film" (manufactured by Shin Sakamoto Oil Co., Ltd.) and "nr film" (manufactured by Nippon Oil Co., Ltd.). A commercially available product of a reflective polarizing film that reflects polarized light of a certain type and reflects polarized light having the opposite property to the polarized light is exemplified as "DBEF" (manufactured by 3M Company, Japanese is purchased from Sumitomo (share)). In addition, 'a commercially available product of a retardation film composed of a ring-shaped resin film is exemplified as "ART0N film" (manufactured by JSR), "Escena" (made by Sekisui Chemical Co., Ltd.), "ZEONOR film" (made by Japan Zeon Co., Ltd.). The back side polarizing plate preferably has an adhesive layer for bonding to the liquid crystal cell on the surface opposite to the crotch sheet. As the adhesive for such an adhesive layer, a conventionally known suitable adhesive can be used, and examples thereof include a bupropion acid-based adhesive, an amine ester-based adhesive, and a poly(oxygen) (si 1 icone) adhesive. Wait. 322120 23 201107838 =, from the viewpoints of transparency, adhesion, reliability, reworkability, etc., the father uses an acrylic adhesive. The adhesive layer may be applied by, for example, an organic solvent solution, which is applied to a substrate film (for example, a polarizing film or the like) by die, coating or gravure coating, and the like. Let it dry. Further, it may be laid by transferring a sheet-like adhesive formed on a release-treated plastic film (referred to as a separation film (1) to a substrate film). The thickness of the adhesive layer is not particularly limited', and is preferably in the range of 2 to 40 #m. <Front Side Polarizing Plate> The front side polarizing plate (the polarizing plate 2 in Fig. 1) is a polarizing plate disposed on the opposite side (visual side) from the surface light source with reference to the liquid crystal cell. A conventionally known suitable polarizing plate can be used as the front side polarizing plate. For example, in addition to the polarizing plate of the protective film formed of cellulose triacetate or the like on one or both areas of the polarizing film, anti-glare treatment, hard coating treatment, and anti-reflection treatment may be used. Polarizer, etc. Further, it may be a polarizing plate made of a protective film or an optical compensation film made of a polyethylene terephthalate film, an acrylic film, a polypropylene film or the like in a single-layer layer of a polarizing film. &lt;surface light source&gt; The liquid crystal display device of the present invention is provided with a surface light source 20 for uniformly illuminating the liquid crystal panel. In the present invention, in order to maximize the function of the cymbal (the function of deflecting the light emitted from the surface light source and correcting the direction of the light emitted from the ridge protrusion toward the front surface of the liquid crystal display device) The surface light source having the specific light-emitting characteristics (light distribution characteristics) is the surface light source 20, and specifically, it satisfies the following formula (1): 322120 24 201107838 A2/A1M0 (1) Here, referring to FIG. 4, the above formula ( In 1), A1 is a direction in which the normal direction τ of the light exit surface of the surface light source and the light emitted from the surface light source are emitted in a plane w perpendicular to the ridgeline direction of the meandering protrusion of the cymbal. The angle formed is the emission angle θ (only the average light intensity of the emitted light whose emission angle 0 is in the range of 0 to X; and A2 is the average light intensity of the emitted light in the range of the emission angle of X to 80. Further, the X system satisfies the relationship of the following formula (2): sina/[sin(180°-a - 2x)/2]-n (2) α represents the ridges of the cymbal The apex angle, n is the refractive index of the prismatic protrusion. First, refer to the 5, the above formula (2) will be described. The light emitted from the light exit surface of the surface light source is incident at an angle Θ equal to the angle X satisfying the above formula (2) (the exit angle (9 = χ) is incident on the dome-shaped projection. In this case, the light path of the incident light is refracted in a manner corresponding to the oblique side of the bead-like protrusion in the condyle without causing total reflection due to the bevel of the prism-like protrusion. The light emitted from the ridge-shaped projection is folded in a direction away from the normal direction of the light-emitting surface of the surface light source when it is incident on the ridge-shaped projection (see Fig. 5(4)). The above equation (2) is satisfied. The angle of incidence f at which the angle X is small is the same as the light emitted from the light exit surface of the surface light source, and Z is the same (see Fig. 5 (6)). That is, the light exiting the surface from the surface light source: the first angle of incidence is χ or less. In the case, 'the exit light is bent by the cymbal in a direction away from the front direction of the liquid crystal display device (the normal direction of the surface light exit surface) (in this case, 稜鏡322120 25 201107838 becomes light diffusion) Sex), and make the liquid crystal display device positive The straightness and contrast of the surface direction are reduced. Furthermore, the angle of incidence 0 is 〇^0(10)/;; 〇 〇 means that the direction of the emitted light from the surface light source is different from the normal direction of the light exit surface of the surface light source. The direction, Θ = 90, means that the direction of the emitted light from the surface light source is parallel to the light exit surface of the surface light source. On the other hand, the angle of incidence of light emitted from the light exit surface of the surface light source is greater than X. The incident light incident on the condyle is concentrated by the total reflection caused by the oblique side ρ of the conical protrusion, and is directed toward the front direction of the liquid crystal display device (the normal direction τ of the light exit surface of the surface light source) ) Bending (refer to Fig. 5(c)) improves the brightness and contrast in the front direction of the liquid crystal display device. In the above formula (1), Α2/Α1 means the light intensity (average light intensity Α2) of the emitted light concentrated in the front direction of the liquid crystal display device by the ruthenium in the emitted light emitted from the surface light source. The ratio of the light intensity (average light intensity Α1) of the light emitted from the direction of the normal direction of the light-emitting surface of the light-emitting surface of the liquid crystal display device by the ruthenium According to the review by the inventors of the present invention, when the ratio avaj exceeds 10 (more preferably 20), a sufficiently high front side brightness and contrast can be obtained in a liquid crystal display device having a back side polarizing plate using a cymbal sheet. . Further, in order to calculate Α2, the upper limit of the emission angle 0 to be considered is set to 80. The reason is more than 8〇. The light intensity of the angle is difficult to measure accurately and is not practical. It can be based on the normal direction Τ of the light exit surface of the surface light source. To 8 baht. Within the range, the brightness of the surface light source is measured, and 〇 is obtained separately. The average value of the brightness in the range of χ, χ to 322120 26 201107838 80 ° in the range of bright positive ~ ~ degree of dry value, and get A1 and A2. &lt;This &lt; ' can use a plurality of planes as the plane W' perpendicular to the ridgeline direction of the prism-shaped protrusions. In the present invention, the above formula (1) may be used as long as it is full in at least one plane. However, in order to achieve a sufficiently high brightness and contrast throughout the liquid crystal display device, it is preferable to satisfy the above formula (1) in a plane w which is perpendicular to the ridge direction of the ridges of any two or more. A direct-type light source using a diffusing plate, an edge type light source using a light guide plate, or the like is used as the surface light source. However, in order to realize the light distribution characteristics as described above, it is preferable to use the light guide plate 22 as shown in FIG. 1 and A side light source (surface light source 20) disposed on the light source device 21 on the side of the light guide plate 22. As the light guide plate 22, a flat plate-like or wedge-shaped member made of a transparent resin such as an acrylic resin can be used. The pattern is imparted on the inner surface or both sides of the light guide plate by screen printing using etching or etching or blast processing. Further, on the inner surface or both surfaces of the light guide plate, a minute reflection element or a minute refractive element having a reflection function may be formed. The desired light distribution characteristics can be obtained by appropriately adjusting the shape or elements of the inner or both sides of the light guide plates. More specifically, for example, T〇ray Research Center Co., Ltd., "The Latest Technology of Liquid Crystal Backlight, Chapter 4" or CMC Publishing Co., Ltd., "Backlight Technology for Liquid Crystal Display, Chapter 2, Chapter 1, Series 4" The light source device described in Chapter 1". A light source device in which a point light source such as an LED is linearly arranged or a light source device including a rod-shaped light source such as a cold cathode tube can be used as the light source device 21. In the liquid crystal display device of the present invention, the surface light source may have one light source device disposed on one side of the light guiding light guide plate, or may be provided with two light source devices on opposite sides of the plate. The side light source is provided with a linear light source device or a light source device composed of a rod light source, and the ridge line of the ridge piece which is preferably arranged is arranged in parallel with the ridge line of the ridge. Plus, , and ,, π----- #,,,, &lt; parallel. According to this configuration and configuration, the light emitted by the side light source can be carried by the cymbal. According to this collection. In order to efficiently gather the liquid crystal display device of the present invention, a conventionally known suitable configuration can be employed for the above description of γ formation. For example, other configurations of the crystal display device may further include a light diffusing plate, a light dispersion, a liquid for the invention, and the like. Mirrors [Examples] The following examples are given to further illustrate the present invention, but the present invention is not limited by the examples. (Production Example 1: Preparation of Polarizing Film) A polyvinyl alcohol film having an average polymerization degree of about 2,400 and a saponification degree of 99.9 mol% or more and a thickness of 75 yin was immersed in pure water at 30 ° C. It was immersed in an aqueous solution of iodine/potassium iodide/water in a weight ratio of 0.02/2/100 at 30 °C. Thereafter, it was immersed in an aqueous solution of potassium bromide/boric acid/water in a weight ratio of 12/5/100 at 56.5 °C. Subsequently, at 8. (: After washing in pure water, at 65. 〇: drying, obtaining a polarizing film for iodine adsorption to polyvinyl alcohol. The elongation is mainly carried out in the iodine dyeing and boric acid treatment steps, and the total stretching ratio is 5. (Manufacturing Example 2: Preparation of ultraviolet curable adhesive) 28 322120 201107838 , a product of hydrogenated epoxy resin manufactured by Japan Epoxy Resin Co., Ltd., Epicoat YX8000 (which is a nuclear hydrogenation double A) The second glycidol test, having an epoxy equivalent of about 205 g / equivalent), 〇g, a product of the photocationic polymerization starter manufactured by Japan Soda Co., Ltd., "CI5102" 4.〇g, and The product name "CS(10)1" manufactured by Japan Minda Co., Ltd. is measured in a 1GG ml disposable cup. It is mixed and defoamed to prepare an ultraviolet curing type adhesive. (Production Example 3: Production of cymbal sheet 1) The glazed polypropylene resin is applied to a predetermined distance such that the formed ridges (cross-sectional shape of the equilateral triangle) are 5 〇 _ and a mold with a apex angle of 65°, heated and simultaneously added Then, after peeling from the mold, it was immediately cooled to 6 (rc to obtain a crucible sheet composed of polypropylene resin. All the domes had a shape according to the design. The refractive index of the sheet 1 was 1.49. Production Example 4: Production of the crepe sheet 2) An ultraviolet curable resin composition having the composition shown below was applied in advance so that the distance between the formed dome-shaped projections (the cross-sectional shape is a two-sided square) was A mold having a thickness of 188/zm and a polyethylene terephthalate film having a thickness of 188/zm were superposed on a layer composed of an ultraviolet curable resin composition, and the mold having a 50/zm and a apex angle of 65 was smoothed. Ultraviolet rays having a wavelength of 32 〇 to 39 〇 nm were irradiated so as to accumulate an irradiation amount of 1000 mJ/cm 2 to cure the ultraviolet curable resin composition. Thereafter, by removing from the mold, the polyethylene terephthalate was obtained. A film of a cured layer of an ultraviolet curable resin composition having a dome-like protrusion is laminated on the diester film. 322120 29 201107838 2. Any of the prism-like protrusions has a shape according to the design. Burst The refractive index is 1.54. (Composition of the ultraviolet curable resin composition used in Production Example 4) FANCRYL FA-321M (Hitachi Chemical Co., Ltd. manufactures ethylene oyide modified bisphenol A methacrylate 45 parts by weight of NK ESTER A-BPE-4 (Nippon Nakamura Chemical Co., Ltd. manufactures epoxy Ethylene modified double A A diacrylic acid) 25 parts by weight

Sartomer 285 (manufactured by Sartomer, tetrahydrogen acrylate) 30 parts by weight

Darocur-1173 (manufactured by Ciba Co., Ltd. 2-Ethyl-2-mercapto-bromopropyl 3 lbute alkyl-1-one) <Example 1> (a) Preparation of polarizing plate Ultraviolet rays obtained in Production Example 2 In the hardening type adhesive, the prism #丨 obtained in the production example 3 is bonded to the surface of one side of the polarizing film obtained in the production example by using the surface opposite to the kneading surface as a bonding surface. The ultraviolet curable adhesive obtained in Production Example 2 was bonded to the other side of the polarizing film by a cellulose diacetate film (10) #m, K〇nica Mi (10), and then in the Japanese battery. ) Manufactured by ultraviolet irradiation I (UV light is "HAL4GGNL", the irradiation distance is 50 cm), and it is green, ♦ 奋 】 铧猓 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古 古by! In this case, I received a polarizer with a good appearance. It is an external hardening type and then the composition of the 丨 丨 & 虱 曰 曰 曰 枭 枭 枭 枭 枭 枭 枭 枭 枭 枭 枭 枭 枭 枭 枭In addition, § has a checkerboard method to evaluate the lens 1 - suddenly, the unpeeled media disk 322120 30 201107838 grid number relative to the twins formed by the number of checkers is 100 / 100, showing good secrets in the An acrylic-based adhesive layer having a thickness of 25 μm was applied to the surface of the triacetylcellulose film of the polarizing plate. (b) Production of liquid crystal display device The polarizing plate was placed on the back surface of the liquid crystal cell via an acrylic adhesive layer, and a commercially available polarizing plate was placed on the front surface of the liquid crystal cell to assemble the liquid crystal panel. The liquid crystal panel and the surface light source A of the light guide plate type (side type light source) (used by VAIO VGN-FE32B/W manufactured by Sony Corporation) were combined to fabricate a liquid crystal display device. When the display of the liquid crystal display device is visually observed, a bright image can be obtained from the front, and the visibility is good. The light intensity distribution of the surface light source A measured using EZ Contrast (ELDIM manufactured LX88W) is shown in Fig. 6. <Example 2> A polarizing plate was produced in the same manner as in Example 1 except that the ruthenium sheet 2 obtained in Production Example 4 was used instead of the ruthenium sheet 1 obtained in Production Example 3, and a liquid crystal display device was produced. When the display of the liquid crystal display device is visually observed, a bright image can be obtained from the front, and the visibility is good. <Comparative Example 1> A surface light source B (a user of a Flexscan EV2411W-H manufactured by Nanao Co., Ltd.) using a light guide plate method (side light source) was used in the same manner as in Example 1 except that the surface light source A was used. Liquid crystal display device. When the display of the liquid crystal display device was visually observed, the image viewed from the front was dark, the contrast was low, and the visibility was poor. The light intensity distribution of the surface light source B measured using EZ Contrast (ELDIM manufactured LX88W) is shown in Fig. 7. 31 322120 201107838 <Comparative Example 2> A liquid crystal display device was produced in the same manner as in Comparative Example 1, except that the ruthenium sheet 2 obtained in Production Example 4 was used instead of the ruthenium sheet 2 obtained in Production Example 3. When the display of the liquid crystal display device was visually observed, the image viewed from the front was dark, the contrast was low, and the visibility was poor. The apex angle, the refractive index, and the angle X calculated from the equivalent value (2) obtained from the ridges of the above-described examples and comparative examples are calculated by the luminance measurement of the surface light source. The values of A1 and A2; and the results of the evaluation of the liquid crystal display device produced are summarized in Table 1. The brightness and contrast of the liquid crystal display device were determined by measuring the center portion of the liquid crystal display device from the front side in a dark room using EZ Contrast (manufactured by ELDIM LX88W). The light intensity distribution (brightness distribution) of the liquid crystal display devices produced in Example 1 and Comparative Example 1 is shown in Figs. 8 and 9. [Table 1] Vertex angle Sepal index Refractive index X-surface source Light source device A1 A2 Liquid crystal display device Visual evaluation Brightness Contrast Example 1 65. 1.49 20.0 Surface light source A 1.51 6639 Good 389 896 Example 2 65. 1.54 21.5 Surface Light Source A 166 6849 Good 360 749 Comparative Example 1 65. 1.49 20.0 Surface light source B 1534 1956 Bad 92 650 Comparative example 2 65. 1.54 21.5 Surface Light Source B 1543 1967 Bad 83 573 It is to be understood that the embodiments and examples disclosed herein are illustrative and not restrictive. The scope of the present invention is defined by the scope of the claims, and is intended to include all modifications within the meaning and scope of the claims. 32 322120 201107838 % [Simplified illustration of the drawings] A section of the liquid crystal display device of the present invention - a preferred embodiment of the preferred embodiment Fig. 2 is a schematic view showing a back side polarizing plate used in the present invention. Cutaway view. Fig. 3 is a schematic perspective view showing an example of the surface shape of the cymbal sheet. The squint of the smear is a schematic oblique view of the light-emitting characteristics of the surface light source used in the present invention. Figs. 5(a) to 5(c) are schematic views for explaining the path of light incident on the ridges having the ridges. Fig. 6 is a view showing the light intensity distributions of the surface light sources a used in the examples 丨 and 2. Fig. 7 is a view showing the light intensity distributions of the surface light sources 6 for Comparative Examples 1 and 2. Fig. 8 is a view showing the light intensity distribution (brightness distribution) of the liquid crystal display device produced in Example 1. Fig. 9 is a view showing the light intensity distribution (brightness distribution) of the liquid crystal display device produced in Comparative Example 1. [Main component symbol description] 1, 2 polarizing plate 10 liquid crystal panel 13 cymbal sheet 14, 16 adhesive layer 3 liquid crystal early 12 polarizing film 13a prismatic protrusion 15 resin film r 33 322120 201107838 17 adhesive layer 20 surface light source 21 light source Device 22 Light guide plate 100 The liquid crystal display device W is perpendicular to the ridge line direction of the ridge line. The normal direction of the light exit surface of the surface light source Μ The direction in which the light source emits light Θ The light exit surface of the surface light source The angle between the line direction and the direction in which the surface light source emits light 斜 the beveled edge of the beak-like protrusion α the vertex angle of the conical protrusion 34 322120

Claims (1)

201107838 VII. Patent application scope: 1. A liquid crystal display device comprising: a surface light source; and a surface light source disposed on the surface light source and having a liquid crystal cell and a surface laminated on a surface light source side of the liquid crystal cell a liquid crystal panel of a polarizing plate, wherein the polarizing plate comprises: a polarizing film; and a ruthenium layer laminated on a surface of the polarizing film via an adhesive, the prism sheet having a surface formed by a dome-shaped protrusion, the cymbal The surface of the surface light source is opposite to the surface light source; the light intensity distribution of the light emitted by the surface light source in a plane perpendicular to the ridgeline direction of the ridge line is satisfied. (1): A2/A1 &gt; 10 (1) [In the above formula (1), A1 is a normal direction of the light exit surface of the surface light source and the surface in the plane When the angle of the exit direction of the light emitted by the light source is set to the exit angle 0 (only 〇 = 6^90), the exit angle 0 is 〇. The average amount of light emitted to the range of X, A2 is the angle of incidence ^ to ( to (10). The average light intensity of the emitted light in the range of x; x is the angle (.) satisfying the relationship of the following formula (2): sina/[sin(180°-a-2x)/2]-n (2) ^ In 2), α represents the apex angle of the above-mentioned ridge, and n represents the refractive index of the ridge. The liquid crystal display device of the above-mentioned Japanese Patent Application No. 322120 35 201107838, the front surface light source is composed of a light guide plate and a light source device disposed on the side of the light guide plate. 3. The liquid crystal display device according to claim 2, wherein the light source device is a light source device in which point light sources are linearly arranged, or a light source device including a rod light source, and the light source device The cymbal is configured such that the light source device is parallel or approximately parallel to the ridgeline of the aforementioned dome. The liquid crystal display device according to any one of claims 1 to 3, wherein the light source device is disposed on one side or opposite sides of the light guide plate. The liquid crystal display device according to any one of the preceding claims, wherein the apex angle α of the aforementioned dome is 6 〇. the above. 322120 36