JP2011039465A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device, in which the number of components is reduced by eliminating a scattering plate on a prism sheet of a backlight system, without making the production process of a polarizing plate to be stuck to a liquid crystal cell complex, and the occurrence of color unevenness is suppressed, even ifn the scattering plate is eliminated. <P>SOLUTION: The backlight system provided on a back side of the liquid crystal cell includes a light source, a light guide plate and a prism sheet disposed on the light guide plate and controlling an optical path. The polarizing plate which is to be stuck to the back surface of the liquid crystal cell comprises a polarizing element, a first protective film disposed on a face in the opposite side of the polarizing element to the liquid crystal cell and disposed facing the prism sheet, and a second protective film disposed on a face in the liquid crystal cell side of the polarizing element. The first protective film is formed of a polyethylene terephthalate resin having a haze in the inside. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a backlight system of a liquid crystal display device and a configuration of a polarizing plate bonded to a liquid crystal cell.

  Liquid crystal display devices are thin and have low power consumption, and thus are widely used as display devices for televisions, computers, mobile phones, car navigation systems, and the like. FIG. 2 is a sectional view showing an example of the configuration of a conventional liquid crystal display device. The liquid crystal display device includes a liquid crystal panel 70 and a backlight system 60 disposed on the back side thereof. The liquid crystal panel 70 includes a liquid crystal cell 80, a first polarizing plate 90 bonded to the back surface of the liquid crystal cell 80, and a second polarizing plate 100 bonded to the front surface of the liquid crystal cell 80. The surface of the liquid crystal cell 80 on the backlight system 60 side is the back surface, and the opposite surface, that is, the viewing side surface is the front surface. In addition, the backlight system 60 side with respect to the liquid crystal panel 70 is the back side. The liquid crystal cell 80 and the first polarizing plate 90, and the liquid crystal cell 80 and the second polarizing plate 100 are bonded by an adhesive layer, respectively, but the illustration of the adhesive layer is omitted.

  The backlight system 60 is provided with a light source 61, a light guide plate 62 that guides light from the light source 61 to the back side of the liquid crystal panel 70, and a light path of the light guide plate 62 provided on the liquid crystal panel 70 side on the light guide plate 62. The prism sheet 63 that faces the liquid crystal panel 70 is placed in contact with the prism sheet 63 to scatter light, thereby concealing the dots of the light guide plate 62 and making the amount of light uniform, thereby preventing color unevenness and interference fringes. And a scattering plate 64. The scattering plate 64 is generally formed of a sheet of polyethylene terephthalate resin.

  The first polarizing plate 90 includes a polarizing element 91 having polarization performance, and protective films 92 and 93 that are provided on both surfaces of the polarizing element 91 via an adhesive layer (not shown) and protect the polarizing element 91. The protective film 93 provided on the liquid crystal cell 80 side of the first polarizing plate 90 has a surface opposite to the polarizing element 91 side attached to the back surface of the liquid crystal cell 80 via an adhesive layer (not shown). Thus, the first polarizing plate 90 is bonded to the back surface of the liquid crystal cell 80. On the other hand, the protective film 92 provided on the backlight system 60 side of the first polarizing plate 90 faces the scattering plate 64 of the backlight system 60 and is spaced apart at a predetermined interval.

  Similarly, the second polarizing plate 100 includes a polarizing element 101 and protective films 102 and 103 provided on both surfaces of the polarizing plate 100 via an adhesive layer (not shown). The protective film 103 on the liquid crystal cell 80 side is bonded to the front surface of the liquid crystal cell 80 through a pressure-sensitive adhesive layer (not shown) on the side opposite to the polarizing element 101 side. 100 is bonded to the front surface of the liquid crystal cell 80. The polarizing elements 91 and 101 are generally formed of a polyvinyl alcohol resin that is dyed with iodine and uniaxially stretched. The protective films 92, 93, 102, and 103 are generally formed of a triacetyl cellulose resin, a norbornene resin, or the like.

  In the configuration of such a conventional liquid crystal display device, since the scattering plate 64 is arranged in contact with the prism sheet 63 on the light guide plate 62, the deflection due to heat occurs particularly as the liquid crystal display device is enlarged. There is a problem that the uniformity of the amount of light transmitted to the liquid crystal panel 70 deteriorates easily. Moreover, it is necessary to laminate three light guide plates 62, prism sheets 63, and scattering plates 64 as the backlight system 60 on the back side of the liquid crystal panel 70, and the number of laminations is large, so that the liquid crystal display device can be thinned. There was a problem of being disadvantageous.

  Patent Documents 1 and 2 disclose a technique that omits the scattering plate of the backlight system of such a liquid crystal display device. Patent Document 1 discloses that a diffusion film (corresponding to the above-described scattering plate) disposed on a prism sheet is not provided, and an anti-glare layer is provided on an upper polarizing plate, that is, a polarizing plate provided in front of a liquid crystal cell. Is disclosed. In Patent Document 1, the diffusion film is for alleviating optical unevenness caused by a prism sheet or the like. However, the diffusion film is omitted, and instead, the optical unevenness is caused by the antiglare layer of the polarizing plate on the front surface of the liquid crystal cell. It is said to ease.

  In Patent Document 2, in order to reduce the thickness of the liquid crystal display device, a light diffusion sheet (corresponding to a scattering plate) on a light collecting sheet made of a prism sheet is omitted, and a concavo-convex structure is formed on the surface of a polarizing plate provided on the back surface of a liquid crystal cell. It is disclosed that a light diffusing layer having the above is provided, thereby making it difficult to generate interference fringes.

  JP 2003-233065 A   JP 2000-075137 A

  However, the technique described in Patent Document 1 requires a process for forming an antiglare layer at the time of producing a polarizing plate, and the number of processes increases. Furthermore, in order to eliminate the color unevenness caused by the prism sheet in the antiglare layer of the polarizing plate provided in front of the liquid crystal cell, it is necessary to significantly increase the haze value of the antiglare layer. There arises a problem that the degree of freedom decreases. The characteristics of the polarizing plate disposed on the front surface of the liquid crystal cell greatly affect the visibility. If the haze value is too high, even if the occurrence of color unevenness can be suppressed, the brightness and visibility are reduced. Further, depending on the liquid crystal display device, it is not preferable to provide an anti-glare layer on the front polarizing plate in order to give a glossy appearance, or there is a demand to lower the haze value even if it is provided. However, this technology has a problem that it cannot meet such demands.

  Further, in the technique described in Patent Document 2, since it is necessary to provide unevenness on the surface of the protective film constituting the polarizing plate, the manufacturing process of the polarizing plate becomes complicated, and it is difficult to control the unevenness on the surface. There is a problem. Furthermore, when the surface of the protective film constituting the polarizing plate is coated with a reflective film or the like, there is a problem that the unevenness effect is lost.

  The present invention has been made to solve such problems, and an object of the present invention is to reduce the thickness of a backlight system of a liquid crystal display device while preventing color unevenness and to bond the liquid crystal cell to a liquid crystal cell. It is an object of the present invention to provide a liquid crystal display device that does not complicate the manufacturing process of the polarizing plate and that does not impose restrictions on the polarizing plate on the front surface of the liquid crystal cell that affects visibility.

  The liquid crystal display device of the present invention includes a liquid crystal cell, a polarizing plate bonded to the back surface of the liquid crystal cell, a light guide plate disposed on the back side of the liquid crystal cell, and the polarizing plate on the light guide plate. A liquid crystal display device having at least a prism sheet for controlling an optical path, wherein the polarizing plate is provided on a surface of the polarizing element opposite to the liquid crystal cell. It is comprised from the 1st protective film arrange | positioned facing, and the 2nd protective film provided in the surface by the side of the said liquid crystal cell of the said polarizing element, The said 1st protective film has a haze inside. It is formed with the polyethylene terephthalate-type resin which has.

  The liquid crystal display device of the present invention is a liquid crystal display device having at least a liquid crystal panel and a backlight system disposed on the back side of the liquid crystal panel, the liquid crystal panel comprising a liquid crystal cell and the liquid crystal It is composed of a first polarizing plate bonded to the back surface of the cell and a second polarizing plate bonded to the front surface of the liquid crystal cell, the backlight system includes a light source and the light from the light source. A light guide plate that leads to a back side of the liquid crystal panel; and a prism sheet that is provided on the liquid crystal panel side on the light guide plate and controls an optical path. The first polarizing plate includes a polarizing element and one of the polarizing plates. A first protective film having a surface bonded to the surface of the polarizing element opposite to the liquid crystal cell and the other surface facing the prism sheet, and one surface of the liquid crystal cell of the polarizing element Glued to the side surface The other surface is composed of a second protective film bonded to the back surface of the liquid crystal cell, and the first protective film is formed of a polyethylene terephthalate resin having haze inside. To do.

  The haze value of the first protective film is preferably 15% to 80%, and the film thickness is preferably 30 μm to 75 μm. The surface of the first protective film that faces the prism sheet is substantially flat.

  The second protective film may be a retardation film. The second protective film is preferably formed of a triacetyl cellulose resin.

  The backlight system of the liquid crystal display device of the present invention does not have a scattering plate (light diffusion sheet) on the prism sheet. Therefore, a thin liquid crystal display device can be realized. Furthermore, in the present invention, by using a polyethylene terephthalate resin film having haze inside as a protective film on the backlight system side of the polarizing plate bonded to the back surface of the liquid crystal cell, color unevenness similar to that of the scattering plate is suppressed. Has the effect of Furthermore, the protective film on the backlight system side of the polarizing plate bonded to the back surface of the liquid crystal cell is disposed to face the prism sheet, but is not in direct contact, and is disposed at a predetermined interval. Yes. Therefore, it is possible to prevent the occurrence of deflection due to heat from the light guide plate or the prism sheet.

  In addition, a polyethylene terephthalate resin having haze inside can be easily manufactured at a relatively low cost. Therefore, in the production of the polarizing plate, there is no need to provide a process such as providing an antiglare layer or forming irregularities on the surface. Moreover, since haze is not given by the unevenness | corrugation of the surface, even if it coats another thin film on the surface of the protective film by the side of the backlight system of a polarizing plate, the function of haze is not lost. In addition, polyethylene terephthalate resin has the advantage that it has higher mechanical strength and is superior in moisture resistance and durability as compared with triacetyl cellulose-based resins that are conventionally used as protective films for polarizing plates. Furthermore, in this invention, as a polarizing plate bonded on the front surface of a liquid crystal cell, a polarizing plate of arbitrary specifications can be used according to the use of a liquid crystal display device, and the polarizing plate of the front surface which affects visibility The design freedom is not hindered.

  Sectional view of the liquid crystal display device of the present invention   Sectional view of a conventional liquid crystal display device

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view of an example of the liquid crystal display device of the present invention. As shown in FIG. 1, the liquid crystal display device of the present invention includes a liquid crystal panel 20 and a backlight system 10 arranged on the back side thereof. The liquid crystal panel 20 includes a liquid crystal cell 30, a first polarizing plate 40 bonded to the back surface of the liquid crystal cell 30, and a second polarizing plate 50 bonded to the front surface of the liquid crystal cell 30. The surface of the liquid crystal cell 30 on the backlight system 10 side is the back surface, and the opposite surface, that is, the viewing side surface is the front surface. In addition, the backlight system 10 side with respect to the liquid crystal panel 20 or the liquid crystal cell 30 is the back side.

  The liquid crystal cell 30 may be any of a TN type, STN type, VA type, and IPS type, and a known one can be used, and the description and illustration of the internal structure are omitted. Although the liquid crystal cell 30 and the 1st polarizing plate 40 and the liquid crystal cell 30 and the 2nd polarizing plate 50 are each bonded by the adhesive layer, illustration of an adhesive layer is abbreviate | omitted.

  The backlight stem 10 is disposed on the back side of the liquid crystal panel 20, that is, on the back side of the liquid crystal cell 30, and includes a light source 11, a light guide plate 12, and a prism sheet 13. The conductive plate 12 is disposed over the entire back side of the liquid crystal panel 20, that is, the back side of the liquid crystal cell 30, and guides light from the light source 11 to the liquid crystal panel 20. The prism sheet 13 is a sheet that is disposed on the side of the liquid crystal panel 20 on the light guide plate 12 in contact with the light guide plate 12, controls the optical path, and directs light toward the liquid crystal panel 20. It may consist of a plurality of sheets. The backlight system 10 of the present invention has no scattering plate (light diffusion sheet) placed on the prism sheet 13.

  The first polarizing plate 40 is bonded to the back surface of the liquid crystal cell 30. The prism sheet 13 of the backlight system 10 is disposed on the light guide plate 12 on the first polarizing plate 40 side, and since there is no scattering plate on the prism sheet 13, the light emitted from the prism sheet 13 is The light is directly incident on the first polarizing plate 40. The first polarizing plate 40 includes a first polarizing element 41 having polarization performance, a first protective film 42 provided on the surface of the first polarizing element 41 on the backlight system 10 side, and a polarizing element 31. And a second protective film 43 provided on the surface of the liquid crystal cell 30 side. The first protective film 42 and the second protective film 43 sandwich the first polarizing element 41 from both sides, thereby protecting and supporting the first polarizing element 41.

  One surface of the second protective film 43 is bonded to the surface of the first polarizing element 41 on the liquid crystal cell 30 side with an adhesive layer. That is, the second protective film 43 is provided on the surface of the first polarizing element 41 on the liquid crystal cell 30 side. The adhesive layer is not shown. The other surface of the second protective film 43, that is, the surface opposite to the first polarizing element 41 is bonded to the back surface of the liquid crystal cell 30 via an adhesive layer (not shown), thereby the first surface. The polarizing plate 40 is bonded to the back surface of the liquid crystal cell 30.

  One surface of the first protective film 42 is bonded to the surface of the first polarizing element 41 opposite to the liquid crystal cell 30 with an adhesive layer. That is, the first protective film 42 is provided on the surface of the first polarizing element 41 opposite to the liquid crystal cell 30. The adhesive layer is not shown. The other surface of the first protective film 42, that is, the surface opposite to the first polarizing element 41 faces the prism sheet 13 of the backlight system 10, and is disposed at a predetermined interval. The space | interval of the 1st protective film 42 and the prism sheet 13 is 1 mm-15 mm, for example. By setting such an interval, the influence of heat from the light guide plate 12 or the prism sheet 13 to the first protective film 42 can be prevented.

  The first polarizing element 41 has a polarizing performance, and a known one can be used. For example, a film of a polyvinyl alcohol (hereinafter referred to as PVA) resin that is dyed with a dichroic dye such as iodine and uniaxially stretched is preferably used. The film thickness of the first polarizing element 41 is, for example, 20 μm to 100 μm.

  The first protective film 42 is formed of a polyethylene terephthalate (hereinafter referred to as PET) resin film, and contains fine particles therein. Due to the internal fine particles, haze is imparted to the inside of the first protective film 42 formed of the PET resin film.

  The PET resin is a resin in which the repeating unit is composed of ethylene terephthalate, but may contain a copolymerization component as long as 80 mol% or more is composed of ethylene terephthalate. PET is produced by, for example, a dehydration condensation reaction between ethylene glycol and terephthalic acid, but is not limited thereto. Moreover, you may make a PET-type resin contain a UV cut agent.

  Examples of the method for forming a PET resin into a film include a method in which a PET resin is melted and extruded into a sheet. It is desirable to further uniaxially or biaxially stretch the PET resin after it is extruded into a sheet. The stretching temperature is, for example, 80 ° C. to 120 ° C., and the stretching ratio is, for example, 3 to 5 times. In this way, a PET resin film is obtained. The film thickness of the first protective film 42 is preferably, for example, 30 μm to 75 μm, and more preferably 45 μm to 60 μm.

  Examples of the step of mixing the fine particles imparting haze inside the PET resin film include a step of melting the PET resin to form a film. Thereby, fine particles can be easily mixed with the PET resin without providing a special process. Examples of the fine particles include inorganic fine particles such as silica, alumina and calcium carbonate, and organic fine particles such as polyimide and silicone resin. The particle size and amount of the fine particles are adjusted according to the haze value to be obtained. The particle size is preferably a size that does not reflect the irregularities of fine particles on the film surface when the PET resin is formed into a film. For example, the particle diameter of the fine particles is preferably 1 μm to 10 μm, more preferably 3 μm to 7 μm. By doing in this way, the unevenness | corrugation of microparticles | fine-particles is not reflected on the surface of a PET resin film, but the 1st protective film 42 which consists of a PET-type resin which has a haze inside and a substantially flat surface is obtained. .

  The preferred haze value of the first protective film 42 is 15% to 80%, more preferably 20% to 50%, and still more preferably 25% to 35%. The haze value is based on the JIS3716 standard. By using such a haze value, even if the scattering plate is abolished, it is possible to obtain an effect of suppressing the occurrence of color unevenness equivalent to that of the scattering plate.

  On the surface opposite to the first polarizing element 41 of the first protective film 42 formed of a PET-based resin film, that is, the surface facing the prism sheet 13, a film having a UV cut function or a reflective A membrane may be coated. Since the surface of the first protective film 42 is substantially flat, the surface of the first protective film 42 facing the prism sheet 13 is also substantially flat. As a layer which has the UV cut function of the 1st protective film 42, acrylic resin containing a UV cut agent is illustrated, for example, The film thickness is 3 micrometers-10 micrometers, Preferably it is 5 micrometers-8 micrometers. In this invention, it has a haze inside a PET-type resin film, and does not give a haze by the unevenness | corrugation of a surface. Therefore, a film can be arbitrarily coated on the surface of the first protective film 42 facing the prism sheet 13, and the haze effect is not lost by the coating.

  As the adhesive for adhering the first polarizing element 41 and the first protective film 42, a known one can be used. Examples of the adhesive include a PVA adhesive, an acrylic adhesive, and a urethane adhesive. In order to further increase the adhesive force, the first protective film 42 made of a PET-based resin film may be subjected to an easy contact treatment on the adhesive surface with the first polarizing element 41, and an easy adhesive layer is provided. May be.

  In this invention, the 2nd protective film 43 can use arbitrary things and is not limited. For example, a triacetyl cellulose (hereinafter referred to as TAC) resin is preferably used, but a cycloolefin resin such as a norbornene resin can also be used. The second protective film 43 is preferably a transparent film, but may have a predetermined haze value. The second protective film 43 may have a function as a retardation film. The film thickness of the second protective film 43 is, for example, 5 μm to 120 μm. Moreover, also about the adhesive agent which adhere | attaches the 1st polarizing element 41 and the 2nd protective film 43, a well-known thing, for example, a PVA type adhesive agent, an acrylic adhesive agent, a urethane type adhesive agent etc. can be used. .

  A well-known thing can be used also about the adhesive which bonds the liquid crystal cell 30 and the 1st polarizing plate 40, ie, the adhesive which bonds the liquid crystal cell 30 and the 2nd protective film 43. FIG. For example, an acrylic adhesive, a urethane adhesive, a silicone adhesive, and the like can be given. Moreover, you may use the adhesive which has a UV cut function.

  About the 2nd polarizing plate 50 bonded by the front surface of the liquid crystal cell 30, it does not restrict | limit in this invention, According to the use of a liquid crystal display device, arbitrary things can be used. For example, the second polarizing plate 50 is provided through a second polarizing element 51 having polarization performance and an adhesive layer (not shown) on the surface of the second polarizing element 51 opposite to the liquid crystal cell 30. 3, and a fourth protective film 53 provided on the surface of the second polarizing element 51 on the liquid crystal cell 30 side through an adhesive layer (not shown). The surface of the fourth protective film 53 opposite to the second polarizing element 51 is bonded to the liquid crystal cell 30 with an adhesive layer (not shown), whereby the second polarizing plate 50 is used in the liquid crystal cell. 30.

  As with the first polarizing element 41, the second polarizing element 51 is exemplified by a PVA resin film that is dyed with iodine and uniaxially stretched. However, the polarization axis of the second polarization element 51 is 90 ° different from the polarization axis of the first polarization element 41. The third protective film 52 and the fourth protective film 53 may be films of the same material or different materials, and examples thereof include cycloolefin resins such as TAC resins and norbornene resins. In addition, the third protective film 52 and the fourth protective film 53 may be transparent films, or one or both may be films having a predetermined haze value. The fourth protective film 53 may be a retardation film. Adhesive for bonding the second polarizing element 51 and the third protective film 52, adhesive for bonding the second polarizing element 51 and the fourth protective film 53, and pasting the fourth protective film 53 and the liquid crystal cell 30 The same adhesive as in the case of the first polarizing plate 40 is also exemplified and can be used.

  In the present invention, the first protective film 42 of the first polarizing plate 40 on the back surface of the liquid crystal cell 30 is made of a PET-based resin having haze inside, thereby suppressing the occurrence of color unevenness. About the haze value of the 3rd protective film 52 of the 2nd polarizing plate 50 of the front surface of the cell 30, and the 4th protective film 53, it can set arbitrarily according to the use of a liquid crystal display device, and it has a haze. Not necessary. For example, in order to give an appearance gloss, it is better not to provide haze for the third protective film 52 and the fourth protective film 53, or to lower the haze value or to provide a reflection reduction (LR, AR) layer. preferable. On the other hand, in order to prevent glare, the haze value of the third protective film 52 can be increased, or an antiglare layer can be provided on the viewing side surface of the third protective film 52. As described above, the present invention has an advantage that the front polarizing plate that greatly affects the visibility can be designed according to the use of the liquid crystal display device without any restriction.

  The second polarizing plate 50 may be a polarizing plate having the same configuration as that of the first polarizing plate 40 according to the present invention. That is, as the third protective film 52 provided on the side opposite to the liquid crystal cell 30 of the second polarizing plate 50, the first protective film 42 provided on the side opposite to the liquid crystal cell 30 of the first polarizing plate 40. Of the same material, that is, a PET resin having haze inside. The fourth protective film 53 provided on the liquid crystal cell 30 side of the second polarizing plate 50 is made of the same material as the second protective film 43 provided on the liquid crystal cell 30 side of the first polarizing plate 40. Use. In this case, examples of the second protective film 43 and the fourth protective film 53 include cycloolefin resins such as a TAC resin and a norbornene resin.

  By doing so, the first polarizing plate 40 and the second polarizing plate 50 are different from each other except that the polarization axes of the first polarizing element 41 and the second polarizing element 51 are different by 90 °. The manufacturing cost can be reduced by using a polarizing plate bonded to the back and front of the liquid crystal cell as a set. In this case, since the third protective film 52 provided on the viewing side of the second polarizing plate 50 on the front surface of the liquid crystal cell 30 has haze, the same effect as that provided by the antiglare layer is obtained. As a result, the antiglare effect can be imparted without providing a special process such as antiglare treatment on the surface of the polarizing plate. Furthermore, since the occurrence of color unevenness due to the abolition of the scattering plate can be suppressed by both the first protective film 42 and the third protective film 52, the effect of suppressing color unevenness can be increased. The haze value of the PET resin of the protective film 42 of 1 can also be lowered. The haze values of the PET-based resin films of the first protective film 42 and the third protective film 52 may be different.

  The embodiment of the present invention has been described above, but the present invention is not limited to this, and can be modified without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Backlight system 11 Light source 12 Light guide plate 13 Prism sheet 20 Liquid crystal panel 30 Liquid crystal cell 40 1st polarizing plate 41 1st polarizing element 42 1st protective film 43 2nd protective film 50 2nd polarizing plate 51 1st 2 polarizing elements 52 third protective film 53 fourth protective film 60 backlight system 61 light source 62 light guide plate 63 prism sheet 64 scattering plate 70 liquid crystal panel 80 liquid crystal cell 90 first polarizing plate 91 polarizing element 92 protective film 93 Protective film 100 Second polarizing plate 101 Polarizing element 102 Protective film 103 Protective film

Claims (7)

A liquid crystal cell, a polarizing plate bonded to the back surface of the liquid crystal cell, a light guide plate disposed on the back side of the liquid crystal cell, and an optical path provided on the polarizing plate side on the light guide plate A liquid crystal display device having at least a prism sheet,
The polarizing plate includes a polarizing element, a first protective film provided on a surface opposite to the liquid crystal cell of the polarizing element and disposed to face the prism sheet, and the liquid crystal cell of the polarizing element. A second protective film provided on the side surface,
The liquid crystal display device, wherein the first protective film is formed of a polyethylene terephthalate resin having a haze inside. A liquid crystal display device having at least a liquid crystal panel and a backlight system disposed on the back side of the liquid crystal panel,
The liquid crystal panel is composed of a liquid crystal cell, a first polarizing plate bonded to the back surface of the liquid crystal cell, and a second polarizing plate bonded to the front surface of the liquid crystal cell,
The backlight system includes a light source, a light guide plate that guides light from the light source to the back side of the liquid crystal panel, and a prism sheet that is provided on the liquid crystal panel side on the light guide plate and controls an optical path. ,
The first polarizing plate has a polarizing element, and a first protection in which one surface is bonded to the surface of the polarizing element opposite to the liquid crystal cell and the other surface faces the prism sheet. A film and a second protective film having one surface bonded to the surface of the polarizing element on the liquid crystal cell side and the other surface bonded to the back surface of the liquid crystal cell;
The liquid crystal display device, wherein the first protective film is formed of a polyethylene terephthalate resin having a haze inside.   The liquid crystal display device according to claim 1, wherein a haze value of the first protective film is 15% to 80%.   4. The liquid crystal display device according to claim 1, wherein the first protective film has a thickness of 30 μm to 75 μm.   The liquid crystal display device according to claim 1, wherein a surface of the first protective film facing the prism sheet is substantially flat.   The liquid crystal display device according to claim 1, wherein the second protective film is a retardation film.   The liquid crystal display device according to claim 1, wherein the second protective film is formed of a triacetyl cellulose resin.

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