JP2011034860A - Surface light-source member and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a thin and long surface light-source member that achieves a semi-transmissive liquid-crystal display device which has excellent display characteristics without: a decrease in yield in a backlight assembly process; the occurrence of assembly errors; and deterioration in light-utilization efficiency of the backlight. <P>SOLUTION: A surface light-source member 1 includes: a surface light-source element 3, having at least one or more light-emitting means 3a and thin-plate-like light-guide bodies 3b; and an optical film layer 2. The light-guide body 3b at least has a long plastic film. The optical film layer 2 is formed on the light-emitting face of the surface light-source element 3 via an adhesive layer 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a surface light source member having a polarization function used for a mobile phone, a personal digital assistant (PDA), a video camera, a car navigation system, a personal computer, a computer monitor, a television receiver, an advertising billboard, etc. The present invention relates to a surface light source member that can be wound into a thin and long roll having a polarizing function, and a method for manufacturing the surface light source member.

  Liquid crystal displays that have come to be widely used as small and medium display devices such as mobile phones, PDAs and video cameras, and medium and large display devices such as car navigation systems, personal computers, computer monitors, television receivers, and advertising billboards. The apparatus is composed of a surface light source element (backlight) that emits light in a planar shape and a liquid crystal display panel that provides image information, and the light transmittance is controlled by the image information provided by the liquid crystal display panel. Or video is displayed.

    Conventionally, a liquid crystal display device generally uses a polarizing plate, a phase difference plate, or an elliptically polarizing plate for polarization control and optical compensation. In this liquid crystal display device, each pixel electrode transmits light. There are three types: a transmissive type, a reflective type that reflects, and a semi-transmissive type that transmits part of and reflects part of it.

  When such a liquid crystal display device is used indoors, the transmissive liquid crystal display device is clear and excellent, whereas the reflective liquid crystal display device reflects external light and displays an image. Although it is excellent in visibility outdoors, there is a drawback that it is difficult to see an image in a dark place.

  As a liquid crystal display device having transmissive and reflective advantages, there is a transflective liquid crystal display device. This transflective liquid crystal display device has a backlight by making a pixel electrode semi-transmissive or providing an opening. Visibility can be ensured by both light and outside light. For this reason, it is an optimal display device for a mobile display device such as a portable information terminal.

  In a transflective liquid crystal display device, a polarizing plate (linear polarizing plate) and a retardation plate (1/4 wavelength plate) are provided on both outer sides of a liquid crystal panel formed by sealing and fixing a liquid crystal in a gap between two substrates. ) And the function of making incident light into circularly polarized light. Further, a backlight is disposed outside the back side as viewed from the display surface.

  Currently, a color liquid crystal display device is a color filter substrate comprising a sheet-like glass substrate, a black matrix, a colored layer composed of three primary colors of red (R) / green (G) / blue (B), and a common transparent electrode layer. An alignment layer is formed on the TFT substrate provided with a thin film transistor (TFT) and a pixel electrode, and the two substrates are opposed to the alignment layer to hold a predetermined gap, and a liquid crystal material is provided in the gap. A liquid crystal panel manufactured by forming a liquid crystal layer satisfying the above and bonding and fixing a color filter substrate and a TFT substrate with a sealing material around the liquid crystal layer is used. In order to display an image by controlling the polarization, polarizing plates are attached to the outer surfaces of the color filter substrate and the TFT substrate of the liquid crystal panel.

  Further, a surface light source element that emits light in a planar shape is provided on the back surface of the polarizing plate, and an image is displayed by controlling the light transmittance with a liquid crystal panel.

  As a conventional technique related to this surface light source element, for example, as shown in FIG. 7, a reflection sheet 807, a light guide plate 805, a diffusion sheet 804, a lower prism sheet 803, and an upper prism sheet 803 are laminated in this order. Yes (Patent Document 1). A number of concave or convex light reflecting portions 806 are formed on the lower surface of the light guide plate 805 facing the reflection sheet 807, and light incident from a light source 801 such as a light emitting diode (LED) or a cold cathode tube (CCFL) is received. The light is emitted in a planar shape.

  In such a surface light source element, since it is comprised from many sheet-like members, it is inevitable that material cost will become high. Furthermore, since a process for assembling a large number of sheet-like members into a planar light source element is also required, the processing cost is high. As a result, there was a problem that the product yield was lowered.

  Moreover, in the process of assembling each sheet-like member, there is a problem that the surface of each sheet member is scratched and becomes a defective product.

  Furthermore, since the lower prism sheet and the upper prism sheet have front and back sides, there is a problem that the predetermined performance does not appear when the sheets are assembled upside down, and the predetermined performance does not appear when the order of stacking the sheet-like members is wrong. It was.

  As means for solving such a problem, for example, surface light source elements in which a reflection function, a light guide function, a diffusion function, and a light collection function of a surface light source element are integrated have been proposed (Patent Documents 2 and 3). As shown in FIG. 8, the surface light source elements according to these proposals are composed of an outgoing light control plate 904 and a light guide 905, and the outgoing light control plate 904 includes an outgoing light plate 902 and a convex portion 903. The light incident from the light source is controlled to be emitted in a planar shape.

JP 2008-198481 A JP-A-8-2221013 JP 2002-42528 A

  In the surface light source element in which such functions are integrated, since each function of the surface light source element is integrated in advance, there is no need to stack and assemble a large number of sheet-like members. There is an excellent merit that there are no problems of mixing, scratches, reverse assembly, and wrong stacking order.

  Further, as described above, the transflective liquid crystal display device is configured by laminating a backlight, a polarizing plate, and a retardation plate, but an air layer is formed at the interface between the backlight, the retardation plate, and the polarizing plate. Therefore, there is a problem that the light emitted from the backlight is reflected at the interface due to the influence of surface reflection, and as a result, the light utilization efficiency is lowered.

  The present invention has been made in view of the above circumstances, and there is no reduction in yield in the assembly process of the backlight, no assembly error occurs, there is no decrease in the light utilization efficiency of the backlight, and the semi-transmissive with excellent display characteristics. An object of the present invention is to provide a surface light source member and a surface light source member manufacturing method capable of obtaining a thin and long surface light source member that enables a liquid crystal display device.

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

The invention according to claim 1 is a surface light source member composed of an optical film layer and a surface light source element having at least one light emitting means and a thin light guide.
The light guide has at least a long plastic film,
The surface light source member is characterized in that the optical film layer is formed on the surface from which the surface light source element emits light through an adhesive layer.

  The invention according to claim 2 is the surface light source member according to claim 1, wherein the optical film layer is at least one selected from a polarizing plate, a retardation plate and an elliptically polarizing plate. is there.

  The invention according to claim 3 is characterized in that the optical film layer is formed by laminating a long polarizing plate and a retardation plate continuously formed on a long supporting film. The surface light source member according to claim 1.

  According to a fourth aspect of the present invention, the optical film layer is formed such that at least two sheet-like elliptical polarizing plates are arranged in parallel to a long longitudinal direction on the surface light source element. It is a surface light source member of Claim 1 characterized by the above-mentioned.

  The invention according to claim 5 is the surface light source member according to claim 1, wherein the surface light source member has a total thickness of 0.4 mm or less and can be wound into a roll. .

Invention of Claim 6 is a manufacturing method of the surface light source member comprised from the surface light source element and optical film layer which have at least 1 or more light emission means and a thin-plate-shaped light guide,
The light guide has at least a long plastic film,
It is a manufacturing method of the surface light source member characterized by providing the layer formation process which forms the said optical film layer through the adhesive layer in the surface which the said surface light source element injects light.

  The invention according to claim 7 is the surface light source member according to claim 6, wherein the optical film layer is at least one selected from a polarizing plate, a retardation plate and an elliptically polarizing plate. It is a manufacturing method.

  The invention according to claim 8 is characterized in that the optical film layer is formed by laminating a long polarizing plate and a retardation plate continuously formed on a long supporting film. It is a manufacturing method of the surface light source member of Claim 6.

  The invention according to claim 9 is that the optical film layer is formed by arranging at least two sheet-like elliptically polarizing plates in parallel with a long longitudinal direction on the surface light source element. It is a manufacturing method of the surface light source member of Claim 6 characterized by the above-mentioned.

In the invention according to claim 10, the total thickness of the surface light source member is 0.4 mm or less,
The method of manufacturing a surface light source member according to claim 6, further comprising a winding step of winding the surface light source member in a roll shape after the layer forming step.

With the above configuration, the present invention has the following effects.
In the first and sixth aspects of the invention, the surface light source element and the optical film layer are a surface light source member integrated in advance via an adhesive layer. The step of attaching the optical film layer can be omitted, and the occurrence of defects due to sandwiching of dust, foreign matter, etc. in the attaching step can be prevented.

  In addition, since the surface light source element and the optical film layer are integrated via the adhesive layer, the light emitted from the surface light source element is not reflected by the interface reflection of the surface light source element, and the light utilization efficiency is improved. A surface light source member that does not decrease can be obtained. In this way, there is no reduction in the yield in the assembly process of the backlight, no assembly errors occur, there is no decrease in the light utilization efficiency of the backlight, and it is thin enough to enable a transflective liquid crystal display device with excellent display characteristics. A long surface light source member can be obtained.

  In the second and seventh aspects of the invention, the optical film layer integrated with the surface light source element is a polarizing plate, so that it can be applied to the manufacture of a transmissive color liquid crystal display device by a roll-to-roll method. it can. Further, by using an optical film layer as a retardation plate or an elliptically polarizing plate, it can be applied to the production of a reflection type or semi-transmission type liquid crystal display device by a roll-to-roll method.

  In the invention according to claim 3 and claim 8, the optical film layer integrated with the surface light source element includes a long polarizing plate and a retardation plate continuously formed on the long support film. Since it is formed by laminating, the optical film layer has no break and can be integrated regardless of the arrangement of the surface light source elements, that is, with any arrangement of the surface light source elements.

  In the invention of claim 4 and claim 9, the optical film layer is formed by arranging at least two sheet-like elliptically polarizing plates in parallel to the long longitudinal direction on the surface light source element. Therefore, it is possible to obtain a thin and long surface light source member that enables a liquid crystal display device with little variation in the direction of the optical axis and excellent display characteristics.

  In invention of Claim 5 and Claim 10, a longer surface light source member can be made into one roll as the total thickness of a surface light source member is 0.4 mm or less. As a result, when used in the manufacture of roll-to-roll liquid crystal display devices, manufacturing time and member loss due to replacement of roll-shaped surface light source members are reduced, resulting in improved productivity and lower costs. It becomes. When the thickness exceeds 0.4 mm, the winding length for one roll is reduced.

It is an outline schematic diagram showing a 1st embodiment of a surface light source member. It is sectional drawing of 1st Embodiment of a surface light source member. It is an outline schematic diagram showing a 2nd embodiment of a surface light source member. It is sectional drawing of 2nd Embodiment of a surface light source member. It is an outline schematic diagram showing a 1st embodiment of a manufacturing method of a surface light source member. It is an outline schematic diagram showing a 2nd embodiment of a manufacturing method of a surface light source member. It is sectional drawing of the conventional backlight apparatus. It is sectional drawing of the other conventional backlight apparatus.

Hereinafter, embodiments of the surface light source member and the method for manufacturing the surface light source member of the present invention will be described. The embodiment of the present invention shows the most preferable mode of the present invention, and the present invention is not limited to this.
[First embodiment of surface light source member]
A surface light source member according to a first embodiment will be described with reference to FIGS. FIG. 1 is a schematic external view showing a first embodiment of a surface light source member, and FIG. 2 is a cross-sectional view of the first embodiment of the surface light source member.

  The surface light source member 1 includes a surface light source element 3 and an optical film layer 2, and the surface light source element 3 includes at least one light emitting means 3a and a thin plate-shaped light guide 3b. The light emitting means 3a is formed of, for example, a large number of light reflecting portions convex on the light guide 3b side, and a light source such as a light emitting diode (LED) or a cold cathode tube (CCFL) is provided on the end surface of the light guide 3b. The light incident from the surface is emitted in a planar shape.

  The light guide 3b has at least a long plastic film. The optical film layer 2 is formed on the surface from which the surface light source element 3 emits light with the adhesive layer 4 interposed therebetween.

  In the surface light source element 3, when the light emitting means 3a forms each point and is emitted from each point, and the light emitting surface of the surface light source element 3 is viewed from the front by the plastic film of the light guide 3b, the light quantity at each point is A substantially equal backlight device is constructed.

  The light guide 3b can be a transparent resin film as a long plastic film substrate, and the type thereof is not particularly limited. Examples of suitable plastic films include resins having excellent transparency, such as acrylic resins, polycarbonate resins, and polystyrene resins. The thickness of the plastic film substrate is, for example, about 50 to 200 μm.

  The optical film layer 2 may be any one as long as it is one or more selected from a polarizing plate, a retardation plate, and an elliptically polarizing plate.

  The polarizing plate has a function of extracting linearly polarized light from incident light, and the type thereof is not particularly limited. As an example of a suitable polarizing plate, one having a configuration in which a transparent protective layer is provided on both surfaces of a polarizing film in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol resin can be exemplified. As the dichroic dye, iodine or a dichroic organic dye is used. Moreover, as a transparent protective layer, a triacetyl cellulose film etc. are used, for example. This protective layer may be provided only on one side, not on both sides of the polarizing film. The thickness of the polarizing film is, for example, about 5 to 50 μm, and the thickness of the entire polarizing plate is, for example, about 50 to 200 μm.

  The retardation plate is usually composed of a stretched resin film. Examples of the resin constituting the retardation plate include polycarbonate, polystyrene, polymethyl methacrylate, polysulfone resin, olefin resin, cyclic polyolefin resin, cellulose acetate resin, and the like. The thickness of the retardation plate is, for example, about 10 to 100 μm.

  Further, as the retardation plate, a coating type retardation plate formed by applying a polymerizable liquid crystal composition on a transparent substrate and aligning it, and then fixing the alignment can be used. The material of the substrate of the coating type retardation plate is not particularly limited as long as it is transparent. Examples of suitable substrates include ceramics and resins. As the resin for the substrate, triethylcellulose, polyethylene terephthalate, polyolefin, polycarbonate, polyethersulfone, or the like can be used.

  In the case of this coating type retardation plate, a long and seamless retardation plate can be obtained by a continuous method such as a roll-to-roll method using a long film substrate. As the polymerizable liquid crystal composition, a compound having a polymerizable group which exhibits liquid crystallinity alone or in a composition with another liquid crystal compound, for example, JP-A-7-294735, JP-A-8-3111, Examples thereof include a rod-like polymerizable liquid crystal compound having a polymerizable functional group as described in Japanese Unexamined Patent Publication No. 2002-308831. The thickness of the coating type retardation plate is, for example, about 0.5 to 10 μm, and the thickness of the entire retardation plate when using a resin substrate is, for example, about 50 to 200 μm.

  The circularly polarizing plate is composed of a laminate of a linearly polarizing plate and a quarter wavelength plate or a laminate of a linearly polarizing plate, a half wavelength plate, and a quarter wavelength plate.

  In this embodiment, the optical film layer 2 is composed of a laminate of a polarizing plate 33, a half-wave plate 22 and a quarter-wave plate 11.

  The optical film layer 2 is formed by laminating a long polarizing plate and a retardation plate continuously formed on a long support film, and the optical film layer 2 has no break, and the surface light source element 3 Regardless of the arrangement, it is possible to integrate the surface light source element 3 with any arrangement.

  The pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer 4 is, for example, a polymer such as (meth) acrylic polymer, silicone-based polymer, polyester, polyurethane, polyamide, polyether, fluorine-based polymer, and rubber-based polymer as a base polymer. It can select suitably and can be used.

  The pressure-sensitive adhesive layer 4 has features such as prevention of foaming and peeling phenomenon due to moisture absorption, deterioration of optical characteristics due to thermal expansion difference and the like, prevention of warpage of the image display panel, and formation of an image display device having high quality and excellent durability. More preferred are those with low hygroscopicity and excellent heat resistance.

  Among these, a (meth) acrylic polymer that is excellent in optical transparency and exhibits appropriate wettability, cohesiveness, and adhesive pressure-sensitive adhesive properties is preferable. The (meth) acrylic polymer refers to a polymer containing alkyl (meth) acrylate as a main monomer unit. In the present specification, acrylate or / and methacrylate is represented as (meth) acrylate.

  The pressure-sensitive adhesive layer 4 is formed by laminating a pressure-sensitive adhesive layer on an optical film such as the polarizer, polarizing plate or retardation plate. The forming method is not particularly limited, and examples thereof include a method of applying a pressure-sensitive adhesive solution to the optical film and drying, a method of transferring with a release sheet provided with a pressure-sensitive adhesive layer, and the like.

  As a constituent material of the release sheet, paper, polyethylene, polypropylene, polyethylene terephthalate and other synthetic resin films, rubber sheets, paper, cloth, non-woven fabric, nets, foam sheets and metal foils, and appropriate thin leaf bodies such as laminates thereof Etc. In order to improve the peelability from the pressure-sensitive adhesive layer, the surface of the release sheet may be subjected to a low-adhesive release treatment such as silicone treatment, long-chain alkyl treatment, and fluorine treatment as necessary.

  The thickness of the pressure-sensitive adhesive layer 4 is generally 1 to 30 μm, preferably 5 to 25 μm, and more preferably 5 to 15 μm.

  As described above, since the surface light source element 3 and the optical film layer 2 are the surface light source member 1 integrated in advance through the adhesive layer 4, the sheet-like optical film layer is formed after the liquid crystal panel is manufactured as in the prior art. The affixing step can be omitted, and the occurrence of defects due to sandwiching of dust, foreign matter, etc. in the affixing step can be prevented.

  Further, since the surface light source element 3 and the optical film layer 2 are integrated via the adhesive layer 4, the light emitted from the surface light source element 3 is not reflected and returned by the interface reflection of the surface light source element 3. Thus, it is possible to obtain the surface light source member 1 in which the light use efficiency does not decrease. In this way, there is no reduction in the yield in the assembly process of the backlight, no assembly errors occur, there is no decrease in the light utilization efficiency of the backlight, and it is thin enough to enable a transflective liquid crystal display device with excellent display characteristics. A long surface light source member 1 can be obtained.

  Further, by using the optical film layer 2 integrated with the surface light source element 3 as a polarizing plate, it can be applied to the production of a transmissive color liquid crystal display device by a roll-to-roll method. Moreover, by using the optical film layer 2 as a retardation plate or an elliptically polarizing plate, it can be applied to the production of a reflection type or semi-transmission type liquid crystal display device by a roll-to-roll method.

  Further, the optical film layer 2 integrated with the surface light source element 3 is formed by laminating a long polarizing plate and a retardation plate continuously formed on a long supporting film. The optical film layer 2 is continuous and can be integrated with the surface light source element 3 in any arrangement regardless of the arrangement of the surface light source elements 3.

  In addition, since the optical film layer 2 is formed by arranging at least two sheet-like elliptical polarizing plates in parallel with the long longitudinal direction of the surface light source member 1, there is a variation in the direction of the optical axis. A thin and long optical member 1 that enables a liquid crystal display device that is small and has excellent display characteristics can be obtained.

Moreover, the longer surface light source member 1 can be made into one roll as the total thickness of the surface light source member 1 is 0.4 mm or less. As a result, when used to manufacture a roll-to-roll liquid crystal display device, manufacturing time and member loss due to replacement of roll-shaped optical members are reduced, and productivity can be improved and costs can be reduced. Become. When the thickness exceeds 0.4 mm, the winding length for one roll is reduced.
[Second Embodiment of Surface Light Source Member]
A surface light source member according to a second embodiment will be described with reference to FIGS. FIG. 3 is a schematic external view showing a second embodiment of the surface light source member, and FIG. 4 is a sectional view of the second embodiment of the surface light source member. In the second embodiment of the surface light source member, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In this second embodiment, the optical film layer 2 is formed by arranging at least two sheet-like elliptical polarizing plates 60 in parallel with the long longitudinal direction on the surface light source element 3. The sheet-like elliptically polarizing plate 60 is formed by stacking the polarizing plate 33, the pressure-sensitive adhesive layer 46, the half-wave plate 22, the pressure-sensitive adhesive layer 45, and the quarter-wave plate 11.

  Since the optical film layer 2 is formed by arranging at least two sheet-like elliptical polarizing plates 60 in parallel with the long longitudinal direction of the surface light source member 1, there is little variation in the direction of the optical axis. A thin and long surface light source member 1 that enables a liquid crystal display device having excellent display characteristics can be obtained.

[First Embodiment of Manufacturing Method of Surface Light Source Member]
A first embodiment of the method of manufacturing the surface light source member will be described with reference to FIG. FIG. 5 is a schematic external view showing the first embodiment of the method of manufacturing the surface light source member.

  The first embodiment is a method of manufacturing the surface light source member 1 shown in FIGS. 1 and 2, and unwinds the surface light source element 3 having at least a long plastic film from the surface light source element unwinding portion 301. . The long adhesive layer protective film 400 is unwound from the adhesive layer unwinding section 401, and the adhesive layer protective film 400 has both sides protected by one protective film 400a and the other protective film 400b. The protective film 400a is peeled from the pressure-sensitive adhesive layer 4 at the first peeling portion 402a, and the protective film 400a is wound around the first pressure-sensitive adhesive layer protective film winding portion 402.

  In the pressure-sensitive adhesive layer bonding part 403, the pressure-sensitive adhesive layer 4 protected by the other protective film 400b is bonded to the surface light source element 3, and the other peeling layer 404a is bonded to the other of the pressure-sensitive adhesive layer 4 after the bonding. The protective film 400 b is peeled off from the pressure-sensitive adhesive layer 4, and the other protective film 400 b is wound around the second pressure-sensitive adhesive layer protective film winding portion 404.

  The long optical film layer 2 is unwound from the optical film layer unwinding part 201, the optical film layer 2 is bonded to the adhesive layer 4 by the optical film bonding part 202, and the surface light source member 1 is formed by this bonding. Then, the surface light source member winding portion 101 is wound into a roll shape.

  As described above, the method of manufacturing the surface light source member 1 including the surface light source element 3 having at least one light emitting means and the thin plate-shaped light guide and the optical film layer 2, The light guide has at least a long plastic film, and includes a layer forming step of forming two optical films on the surface from which the surface light source element 3 emits light via the adhesive layer 4. The total thickness of the light source member 1 is 0.4 mm or less, and is provided with a winding step of winding the surface light source member 1 in a roll shape after the layer forming step, and the surface light source element 3 and the optical film layer 2 are preliminarily provided. Since the surface light source member 1 is integrated through the pressure-sensitive adhesive layer 4, it is possible to omit the step of attaching a sheet-like optical film layer after manufacturing a liquid crystal panel as in the prior art, and dust, foreign matter, etc. in this attaching step. Occurrence of defects due to pinching It is possible to prevent. Moreover, the longer surface light source member 1 can be made into one roll as the total thickness of the surface light source member 1 is 0.4 mm or less. As a result, when used in the manufacture of roll-to-roll liquid crystal display devices, manufacturing time and member loss due to replacement of roll-shaped surface light source members are reduced, resulting in improved productivity and lower costs. It becomes. When the thickness exceeds 0.4 mm, the winding length for one roll is reduced.

[Second Embodiment of Method for Manufacturing Surface Light Source Member]
A second embodiment of the method for manufacturing the surface light source member will be described with reference to FIG. FIG. 6 is a schematic external view showing a second embodiment of the method of manufacturing the surface light source member.

  The second embodiment is a method of manufacturing the surface light source member 1 shown in FIGS. 3 and 4, in which a sheet-like elliptical polarizing plate 60 is elliptically formed by the elliptical polarizing plate supply means 603 from the elliptical polarizing plate supply unit 601. It supplies to the polarizing plate supply stand 602. The elliptical polarizing plate supply base 602 reciprocates between the A position and the B position, the A position is a position where the elliptical polarizing plate 60 is received, and the B position is a position where the elliptical polarizing plate 60 is bonded to the adhesive layer 4. is there. The elliptical polarizing plate supply base 602 receives the elliptical polarizing plate 60 that is moved by driving the elliptical polarizing plate supply means 603 at the A position, moves to the B position, and the elliptical polarizing plate bonding means 604 transfers the elliptical polarizing plate 60 to the carrier. It is affixed on the adhesive layer 5a protected by the protective film 5b of the film 5.

  The elliptically polarizing plate bonding means 604 is a rubber-made bonding roll. The elliptically polarizing plate supply unit 601 is a table on which a large number of sheet-like elliptically polarizing plates can be stacked. The elliptically polarizing plate supply means 603 has a mechanism that allows a sheet-like elliptically polarizing plate to be taken out from the elliptically polarizing plate supply unit 601 with a vacuum suction plate and delivered to the elliptically polarizing plate supply base 602 at the A position. The means for taking out and delivering the sheet-like elliptically polarizing plate may be a method other than the vacuum suction plate, such as lightly adhering with a slight adhesive. Although not shown in the present embodiment, when the sheet-like elliptically polarizing plate 60 is attached to the carrier film 5, there may be a function for aligning both, for example, a CCD camera and an image recognition device.

  The carrier film 5 has one of the pressure-sensitive adhesive layers 5a protected by the protective film 5c and the other protected by the protective film 5b. The carrier film unwinding unit 501 unwinds the carrier film 5, and the one protective film 5c Is peeled off at the peeling portion 502 a and wound around the carrier film protective film winding portion 502. As the carrier film 5, a slightly adhesive PET film or the like is used. The thickness of the carrier film 5 is, for example, about 50 to 150 μm.

  The elliptical polarizing plate bonding means 604 is disposed at the B position, and the elliptical polarizing plate bonding means 604 is in the conveying direction of the carrier film 5 with the elliptical polarizing plate supply base 602 stopped at the B position. To the opposite direction, and the elliptically polarizing plate 60 is bonded to the adhesive layer 5a. A protective film (not shown) may be attached in advance to the surface of the elliptical polarizing plate 60 to be bonded to the carrier film 5, in which case the elliptical polarizing plate supply base moves from the A position to the B position. In the meantime, the protective film is removed from the elliptically polarizing plate.

  The long pressure-sensitive adhesive layer protective film 400 is unwound from the pressure-sensitive adhesive layer unwinding portion 401, and one protective film 400a is peeled off from the pressure-sensitive adhesive layer 4 at the first peeling portion 402a, whereby the first pressure-sensitive adhesive layer protective film. One protective film 400 a is wound around the winding portion 402. The pressure-sensitive adhesive layer bonding portion 403 bonds the pressure-sensitive adhesive layer 4 of the other protective film 400b to the carrier film 5, and the pressure-sensitive adhesive layer 4 is bonded to the sheet-like elliptically polarizing plate 60. The other protective film 400b of the pressure-sensitive adhesive layer 4 is peeled from the pressure-sensitive adhesive layer 4 at the peeling portion 404a, the other protective film 400b is wound around the second pressure-sensitive adhesive layer protective film winding portion 404, and an optical film bonding portion It is conveyed to 202.

  The surface light source element 3 having at least a long plastic film is unwound from the surface light source element unwinding section 301, and the surface light source element 3 is bonded to the adhesive layer 4 by the optical film bonding section 202. The member 1 is formed and wound around the surface light source member winding portion 101 in a roll shape.

    As described above, the optical film layer 2 is formed by arranging at least two sheet-like elliptical polarizing plates 60 in parallel with the long longitudinal direction on the surface light source element 3, and the alignment direction of the liquid crystal and the optical film. A thin and long surface light source member 1 that enables a color liquid crystal display device with little variation in the direction of the optical axis of the layer 2 and excellent display characteristics can be obtained.

  The liquid crystal display device has been described in this specification, but the present invention can be applied to various image display devices having a color filter function and a polarization function, such as a color organic EL display.

  The present invention can be applied to a surface light source member that can be wound into a thin and long roll having a polarization function, and a method for manufacturing the surface light source member, and does not cause a decrease in yield in the assembly process of the backlight. A thin and long surface light source member that enables a transflective liquid crystal display device excellent in display characteristics without causing a mistake and without reducing the light use efficiency of the backlight can be obtained.

DESCRIPTION OF SYMBOLS 1 Surface light source member 2 Optical film layer 3 Surface light source element 3a Light emission means 3b Light guide 4 Adhesive layer 5 Carrier film 5a Adhesive layer 5b Protective film 5c Protective film 11 1/4 wavelength plate 22 1/2 wavelength plate 33 Polarizing plate 45 Adhesive layer 46 Adhesive layer 60 Sheet-like elliptically polarizing plate 101 Surface light source member winding unit 201 Optical film layer unwinding unit 202 Optical film laminating unit 301 Surface light source element unwinding unit 401 Adhesive layer unwinding Part 400 adhesive layer protective film 400a one protective film 400b other protective film 401 adhesive layer unwinding part 402 first adhesive layer protective film winding part 402a first peeling part 403 adhesive layer bonding part 404 2nd adhesive layer protective film winding part 404a 2nd peeling part 601 Elliptical polarizing plate supply part 602 Elliptic polarizing plate supply stand 603 Ellipsoidal polarizing plate supply means 604 Ellipsoidal polarizing plate bonding means

Claims (10)

A surface light source member comprising a surface light source element having at least one light emitting means and a thin plate-shaped light guide and an optical film layer,
The light guide has at least a long plastic film,
The surface light source member, wherein the optical film layer is formed on the surface from which the surface light source element emits light through an adhesive layer.   The surface light source member according to claim 1, wherein the optical film layer is at least one selected from a polarizing plate, a retardation plate, and an elliptical polarizing plate.   2. The surface according to claim 1, wherein the optical film layer is formed by laminating a long polarizing plate and a retardation plate continuously formed on a long supporting film. Light source member.   2. The optical film layer according to claim 1, wherein the optical film layer is formed by arranging at least two sheet-like elliptical polarizing plates in parallel with a long longitudinal direction on the surface light source element. A surface light source member.   2. The surface light source member according to claim 1, wherein the surface light source member has a total thickness of 0.4 mm or less and can be wound into a roll. A method of manufacturing a surface light source member comprising a surface light source element having at least one light emitting means and a thin plate-shaped light guide and an optical film layer,
The light guide has at least a long plastic film,
A method for producing a surface light source member, comprising: a layer forming step of forming the optical film layer on a surface from which the surface light source element emits light through an adhesive layer.   The method for producing a surface light source member according to claim 6, wherein the optical film layer is at least one selected from a polarizing plate, a retardation plate, and an elliptical polarizing plate.   The surface according to claim 6, wherein the optical film layer is formed by laminating a long polarizing plate and a retardation plate continuously formed on a long supporting film. Manufacturing method of light source member.   The optical film layer is formed by arranging at least two sheet-like elliptical polarizing plates in parallel with a long longitudinal direction on the surface light source element. Manufacturing method of surface light source member. The surface light source member has a total thickness of 0.4 mm or less,
The method of manufacturing a surface light source member according to claim 6, further comprising a winding step of winding the surface light source member in a roll shape after the layer forming step.