JP2001116924A - Production member for phase difference plate, method of producing phase difference plate, optical member and liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a production member which hardly transfers fisheye defects and to obtain a phase difference plate having good quality with high yield in which generation of appearance defects is suppressed by a shrinking treatment process of a thermally shrinking film. SOLUTION: The production member is to be adhered to a thermoplastic film to treat the thermoplastic film by the effect of thermally shrinking force and then to be peeled to obtain a phase difference plate. The production member for a phase difference plate consists of a thermally shrinking film having fisheye defects with <=500 μm major diameter or <=10 μm protruding height. In the method of producing a phase difference plate, the production member is adhered to one or both faces of a thermoplastic film and heated so as to stretch or shrink the thermoplastic film in at least one direction of the longitudinal direction and the lateral direction by the effect of shrinking force of the production member and then the production member is peeled. The optical member consists of a laminated body of the phase difference plate and a polarizing plate. The liquid crystal display device has the phase difference plate or the phase difference plate and a polarizing plate on at least one side of a liquid crystal cell. Thus, the phase difference of a liquid crystal cell can be compensated at a high level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a retardation plate suitable for improving a viewing angle and a contrast of a liquid crystal display device with a high yield, and a member for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a heat shrinkable film (manufactured member) has been used as a method for manufacturing a retardation plate capable of compensating for a phase difference due to birefringence of a liquid crystal cell and achieving an increase in a viewing angle and an improvement in contrast of a liquid crystal display device. And a method of stretching a thermoplastic film under the action of its shrinkage by heating (Japanese Patent Laid-Open No. 5-157911). The production member after the stretching treatment is peeled from the obtained retardation plate. However, in the case of the conventional manufacturing member, there was a problem that the obtained retardation plate had poor appearance and the yield was poor.

[0003]

The inventors of the present invention have conducted intensive studies in order to prevent the above-mentioned appearance defects from occurring, and found that the shape of the fish eyes present in the heat-shrinkable film during the process of shrinking it. It has been clarified that the reflection is transferred to a thermoplastic film and that the resulting retardation plate causes poor appearance.
Accordingly, an object of the present invention is to obtain a production member in which fish eyes are hardly transferred, and to obtain a good-quality retardation plate with good appearance in which the occurrence of poor appearance is suppressed by a heat-shrinkable film shrinkage treatment method with a high yield. .

[0004]

The present invention relates to a manufacturing member for bonding a thermoplastic film, treating the thermoplastic film under the action of heat shrinkage, and then peeling to obtain a retardation plate. The production member of the retardation plate, characterized in that the major axis of the eye is made of a heat-shrinkable film having a length of 500 μm or less or a projection height of 10 μm or less, and the production member is adhered to one or both surfaces of a thermoplastic film, and An object of the present invention is to provide a method for manufacturing a retardation plate, which comprises stretching or shrinking the thermoplastic film in at least one direction in a longitudinal direction and a transverse direction under the action of a shrinkage force of the manufacturing member, and then peeling the manufacturing member.

Further, the present invention provides an optical member comprising a laminate of a retardation plate and a polarizing plate according to the above-mentioned manufacturing method, and a retardation plate according to the above-described manufacturing method, or a method for forming a liquid crystal cell using the retardation plate and the polarizing plate. A liquid crystal display device provided at least on one side is provided.

[0006]

According to the present invention, the use of the heat-shrinkable film in which the fish-eye existing as described above is controlled allows the shrinkage force of the heat-shrinkable film to be efficiently propagated to the thermoplastic film. It is possible to suppress the transfer of the surface state due to the fish eyes to the obtained retardation plate, and to suppress the occurrence of poor appearance to obtain a good-quality retardation plate with high yield. As a result, a retardation plate with a highly controlled retardation under the action of the shrinking force of the heat-shrinkable film can be efficiently obtained, and the retardation due to the birefringence of the liquid crystal cell is highly compensated for using the retardation plate. And a liquid crystal display device excellent in contrast can be obtained.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A production member according to the present invention has a fisheye having a major axis of 500 μm or less or a projection height of 1
It is made of a heat-shrinkable film having a thickness of 0 μm or less, and is used to obtain a retardation plate by adhering to the thermoplastic film, treating the thermoplastic film under the action of heat shrinkage, and then peeling it off. Further, in the production method according to the present invention, the production member is adhered to one or both surfaces of a thermoplastic film, and the thermoplastic film is stretched or shrunk in at least one direction in the vertical and horizontal directions under the action of shrinkage force of the production member by heating. Thereafter, the production member is peeled off to obtain a retardation plate.

[0008] A manufacturing member made of a heat-shrinkable film transmits a shrinkage force due to the heating to a thermoplastic film adhered through an adhesive layer or the like, and moves the thermoplastic film vertically or horizontally under the action of the shrinkage force. The purpose is to control the retardation characteristics, particularly the refractive index in the thickness direction, by stretching or shrinking in one or both directions.

In the present invention, the heat-shrinkable film has a fisheye having a major axis of 500 μm or less or a protruding height of 10 μm or less.
Those having no fish eyes having a size exceeding 0 μm or a projection height exceeding 10 μm are used. Thereby, it is possible to prevent the shape of the fish eye from being transferred and reflected on the thermoplastic film in the process of shrinking the heat-shrinkable film, thereby preventing the retardation plate from having a poor appearance. The heat-shrinkable film which can be preferably used from the viewpoint of prevention of appearance defect, etc., has a major axis of fish eyes of 480 μm or less, especially 450 μm.
The fish eyes have a projection height of 9 μm or less, particularly 8 μm or less.

The material for forming the heat-shrinkable film is not particularly limited, and examples thereof include uniaxially and biaxially stretched films made of thermoplastic resin such as polyvinyl chloride, polyethylene, polypropylene, polyester, polystyrene and polyamide. An appropriate material that exhibits shrinkage by heat treatment can be used. In this case, the heat shrink force can be made different by changing the type of the thermoplastic resin and the stretching conditions such as the stretching ratio.

In the above description, from the viewpoint of imparting heat shrink force, heat shrinkage is started at a temperature lower than the shrinkage treatment temperature of the thermoplastic film to be processed, and the heat shrinkage is reduced near the glass transition temperature of the thermoplastic film. Is preferably used. Further, from the viewpoint of imparting a uniform orientation to the thermoplastic film, a heat-shrinkable film having a heat-shrinking force as uniform as possible over the entire surface of the film and having excellent surface smoothness is preferably used.

The thickness of the heat-shrinkable film is not particularly limited, and can be appropriately determined according to the heat-shrinking force and the like. The thickness is between 5 and 500 μm, preferably between 10 and 300 μm, especially between 20 and 200 μm.

[0013] The heat-shrinkable film may be provided with an adhesive layer for the purpose of adhering it to the thermoplastic film. The pressure-sensitive adhesive layer is more preferable than the point that the pressure-sensitive adhesive layer can be separated from the retardation plate formed by easily peeling off after the shrinkage treatment. For forming the pressure-sensitive adhesive layer, for example, one or more suitable pressure-sensitive adhesives such as acrylic, silicone, polyester, polyurethane, polyether, and rubber can be used.

In particular, the point of preventing adhesive residue at the time of separating the formed retardation plate and the heat-shrinkable film, that is, separating the adhesive layer with the heat-shrinkable film,
From the viewpoint of preventing the adhesive layer from remaining on the formed retardation plate and improving the production efficiency and the like, an adhesive layer in which the adhesive force is hardly increased by the heat shrinkage treatment of the heat shrinkable film is preferable. .

The application of the pressure-sensitive adhesive layer to the heat-shrinkable film may be performed by applying a pressure-sensitive adhesive to the heat-shrinkable film and drying the heat-shrinkable film. A method in which an adhesive layer provided on a separator is transferred to a heat-shrinkable film is more preferable than preventing a change in characteristics. The pressure-sensitive adhesive layer can be provided as a superposed layer of the same or different pressure-sensitive adhesives.

In the above case, the separator can be used as a protective cover for preventing the adhesive layer from being contaminated until the heat-shrinkable film is put into practical use. The surface of the heat-shrinkable film provided with the adhesive layer can be subjected to an appropriate surface treatment such as a corona treatment for the purpose of improving the adhesion to the adhesive layer.

The thickness of the pressure-sensitive adhesive layer can be appropriately determined according to the adhesive strength and the like. Generally from 5 to 300 μm from the point of suppressing the foaming and adhesive residue of the adhesive layer while efficiently transmitting the shrinking force of the heat shrinkable film to the thermoplastic film.
m, especially 10 to 100 μm, especially 15 to 50 μm.

In the production method according to the present invention, the above-mentioned production member is adhered to one or both surfaces of a thermoplastic film via an adhesive layer or the like as necessary, and the contraction force of the production member based on the heat-shrinkable film by heating is reduced. Under the action, the thermoplastic film is stretched or shrunk in one or both directions in the vertical or horizontal direction to obtain a retardation plate having controlled retardation characteristics. In that case, a film made of a suitable light-transmitting thermoplastic resin can be used as the thermoplastic film, and there is no particular limitation.

In particular, the light transmittance is 75% or more, especially 85%
The above-mentioned thermoplastic film excellent in light transmittance can be preferably used. Further, from the viewpoint of obtaining a retardation plate having excellent heat resistance, a polymer made of a polymer having a positive birefringence property and having a high refractive index in the stretching direction is preferably used. Further, a thermoplastic film made of an amorphous polymer having a photoelastic coefficient of 10 ⁻⁹ Pa ⁻¹ or less is preferably used from the viewpoint of controllability of retardation and the like.

Incidentally, examples of the above-mentioned polymer having a positive birefringence characteristic include polycarbonate, polyvinyl alcohol, cellulose resin, polyester such as polyethylene terephthalate and polyethylene naphthalate, polyarylate, polyimide, norbornene resin, polysulfone and polyether. And polyolefins such as sulfone and polypropylene.

The thermoplastic film may be formed by an appropriate method such as a casting method such as a casting method or an extrusion method. A solution casting method such as a casting method is more preferable in that a film having less unevenness in thickness and uneven orientation is obtained. The thermoplastic film can be used in a prescribed size for batch processing, or can be used as a long film for the purpose of continuous production. In this case, a long member is also used for the manufacturing member.

The thickness of the thermoplastic film can be appropriately determined depending on the intended retardation characteristics of the retardation plate. Generally 5 to 500 μm, especially 10 to 400 μm,
In particular, the thickness is 20 to 300 μm. The phase difference can be obtained as the product (Δn × L) of the refractive index difference (Δn) and the optical path length (L). The thermoplastic film to be treated may be non-oriented or may be an oriented film that has been subjected to an appropriate orientation treatment such as uniaxial stretching in advance.

In the above, one or two or more appropriate numbers of the production members can be adhered to one or both surfaces of the thermoplastic film depending on the desired shrinkage force or the like. In this case, at least a production member adjacent to the thermoplastic film is made of a heat-shrinkable film that satisfies the above-described fisheye condition. When the production member is bonded to both sides or when a multilayer is bonded to one side, the production members on the front, back, upper and lower sides may be the same or have different heat shrinkage characteristics such as heat shrinkage. It may be.

The adhesive force of the production member to the thermoplastic film can be appropriately determined. However, the adhesive force of the production member to room temperature is more important than the above-mentioned points of transmission of heat shrinkage force, prevention of poor quality, easy separation after shrinkage treatment, and the like. 35-2 based on T-type peeling in
00gf / 50mm, especially 40-190gf / 50mm, especially 50-
It is preferably 180 gf / 50 mm.

The above-mentioned adhesive force can be achieved by, for example, a method of controlling the adhesive force of the pressure-sensitive adhesive layer, a method of performing an appropriate surface treatment such as corona treatment on the thermoplastic film, and a method of controlling the adhesive force with the pressure-sensitive adhesive layer. One or two or more appropriate methods such as a method of controlling the adhesive force by performing an appropriate treatment such as a heat treatment or an autoclave treatment in a state where the member and the production member are adhered can be applied.

The shrinkage treatment of the production member adhered to the thermoplastic film can be carried out through a suitable stretching machine such as a roll stretching machine, a tenter or a biaxial stretching machine. The processing temperature is in the vicinity of the glass transition temperature of the thermoplastic film, especially within the temperature range of ± 20 ° C of the glass transition temperature, especially above the glass transition temperature. It is more preferable than such points.

The treatment given to the thermoplastic film under the action of the shrinkage force of the produced member by heating is either stretching or shrinking, and can be appropriately determined according to the retardation plate to be formed. The treatment to be applied may be either in the vertical and horizontal directions (length direction and width direction) of the thermoplastic film, or may be both. When the treatment is applied in both directions, a combination in which the contraction treatment is applied in one direction and the stretching treatment is applied in the other direction may be adopted. The treatment given to the thermoplastic film under the action of the contraction force of the production member described above can also be performed in two or three or more steps.

The method according to the present invention controls the refractive index in the thickness direction so that the phase difference in the direction related to the refractive index in the thickness direction becomes larger than the phase difference due to the refractive index difference in the film plane. It can be advantageously used for producing a retardation plate. The control of the refractive index in the thickness direction can be generally performed by a method of shrinking at least one of the length and width directions of the thermoplastic film.

When the necessary processing is completed as described above, the manufactured members after the shrinkage processing are peeled off from the formed retardation plate and separated from each other. The obtained retardation plate can be used for practical use as it is, or can be put to practical use as a product obtained by further adjusting the retardation characteristics by adding a stretching treatment or the like.

The preferred retardation plate according to the present invention is not limited to this, but the retardation due to birefringence and the dispersion of the orientation axis are as small as possible, and especially the direction perpendicular to the film surface (in the front direction). The variation of the phase difference in transmitted light is 10 nm or less, particularly 5 nm or less, and the variation of the alignment axis is 5 degrees or less, particularly 3 degrees or less.

The retardation plate according to the present invention is preferably used as a single layer or a laminate of the same type or different types for compensating a phase difference due to birefringence for the purpose of expanding the viewing angle of a liquid crystal cell and improving contrast. Can be used. In practical use, for example, an adhesive layer is provided on one or both sides of a retardation plate, or a polarizing plate, or a protective layer made of an isotropic transparent resin layer or a glass layer is bonded through the adhesive layer. It can also be applied as an optical member of an appropriate form such as a laminated one.

The above-described lamination with a polarizing plate or the like can be performed by a method of sequentially laminating the liquid crystal display device in the manufacturing process. However, by laminating in advance, the stability of quality and laminating workability are excellent. Therefore, there is an advantage that the manufacturing efficiency of the liquid crystal display device can be improved. Note that an appropriate adhesive or the like can be used for adhesion. Above all, adhesive layers such as those exemplified above, particularly acrylic ones are preferably used from the viewpoint of heat resistance and optical properties.

If necessary, the adhesive layer may be made of, for example, natural or synthetic resins, fillers or pigments made of glass fibers, glass beads, metal powders or other inorganic powders, coloring agents, antioxidants, etc. Can be added.
Further, an adhesive layer exhibiting light diffusing properties can be formed by incorporating fine particles.

As the polarizing plate to be laminated with the retardation plate, any suitable polarizing plate may be used, and examples thereof include a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, and an ethylene / vinyl acetate copolymer-based partially saponified film. A film obtained by adsorbing iodine and / or a dichroic dye on a hydrophilic polymer film such as that described above and stretching the film, or a polarizing film composed of a polyene oriented film such as a dehydrated product of polyvinyl alcohol or a dehydrochlorination product of polyvinyl chloride, and the like. Is raised.

The polarizing plate may have a transparent protective layer on one side or both sides of the above-mentioned polarizing film.
Further, the polarizing plate may be a reflection type or a semi-transmission type having a reflection layer, a half mirror, and the like. The reflective polarizing plate is used to form a liquid crystal display device or the like that reflects and reflects incident light from the viewing side (display side). There are advantages such as easy reduction in thickness of the display device.

The transparent protective layer can be suitably formed as a coating layer of a polymer or a laminate of a protective film. For the formation of the transparent protective layer, for example, a polymer having excellent transparency, mechanical strength, heat stability, moisture shielding property, etc. Is preferably used. Examples include polyester resins and acetate resins, polyethersulfone resins and polycarbonate resins, polyamide resins and polyimide resins, polyolefin resins and acrylic resins, or acrylic, urethane and acrylic urethane resins. Examples of such resins include thermosetting resins such as epoxy resins and silicone resins, and ultraviolet curing resins. The surface of the transparent protective layer may be formed into a fine uneven structure by containing fine particles.

The reflective polarizing plate can be formed by an appropriate method such as a method in which a reflective layer made of metal or the like is provided on one side of the polarizing plate via a transparent resin layer or the like, if necessary. Specific examples thereof include a transparent resin layer such as a protective film that has been subjected to a mat treatment as required, and a foil or a vapor-deposited film made of a reflective metal such as aluminum provided on one surface, or a surface fineness due to the inclusion of fine particles in the transparent resin layer. An example in which a metal reflective layer is provided on the concavo-convex structure by an appropriate method such as a vapor deposition method or a plating method is given. The transflective polarizing plate can be obtained by making the above-mentioned reflective layer a transflective type such as a half mirror.

In laminating the retardation plate and the polarizing plate, the arrangement angles of the optical axes such as the transmission axis and the fast axis are not particularly limited, and can be appropriately determined. Incidentally, when it is applied to STN type liquid crystal cells, it is often arranged at an oblique crossing angle such as 45 degrees, and when it is applied to TN type liquid crystal cells, it is arranged at a substantially parallel or substantially orthogonal crossing angle. There are many.

Although it has been described above that two or more retardation plates can be used by laminating them, this is for the purpose of improving the compensation effect and the like. And a laminate with the above retardation plate. As the retardation plate, an appropriate one such as a uniaxially or biaxially stretched film exemplified by the above-described thermoplastic film, a discotic or nematic liquid crystal alignment plate, or the like can be used.

The layers such as the retardation plate and the polarizing plate, the transparent protective layer and the adhesive layer are formed of, for example, a salicylic acid ester compound, a benzophenol compound, a benzotriazole compound, a cyanoacrylate compound, a nickel complex salt compound, or the like. Ultraviolet absorbing ability can be provided by a method of treating with an ultraviolet absorbent.

The retardation plate according to the present invention is of a TN type or a TN type, for example, for compensating for the phase difference in the oblique direction in which the contrast in the front direction is prevented, or for compensating for the phase difference in the front direction and the oblique direction. It can be preferably used for compensating viewing angle characteristics due to birefringence in various types of liquid crystal cells such as STN type and π type.

The formation of a liquid crystal display device using the above-mentioned retardation plate can be performed according to a conventional method. That is, a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell and a retardation plate for optical compensation, and a polarizing plate and an illumination system as needed, and incorporating a drive circuit,
In the present invention, there is no particular limitation except that the retardation plate according to the present invention is used for optical compensation and provided on at least one side of the liquid crystal cell together with the polarizing plate as necessary.
It can be according to the conventional.

Accordingly, a liquid crystal display device in which a polarizing plate is disposed on one or both sides of a liquid crystal cell, a transmission type or a reflection type using a backlight or a reflection plate or a semi-transmission type reflection plate in an illumination system, or a combination of a reflection type and a transmission type. An appropriate liquid crystal display device such as a mold can be formed. In the case of a liquid crystal display device using a polarizing plate, it is preferable that the retardation plate for optical compensation is disposed between the liquid crystal cell and the polarizing plate, particularly, the polarizing plate on the viewing side from the viewpoint of the compensation effect. In the arrangement, the optical member described above may be used.

In the above, the forming parts of the liquid crystal display device are as follows:
They may be laminated and integrated, or may be in a separated state. In forming the liquid crystal display device, for example, appropriate optical elements such as a diffusion plate, an anti-glare layer, an antireflection film, a protective layer and a protective plate can be appropriately arranged. Such an element can be used for forming a liquid crystal display device in the form of the above-described optical member laminated with a retardation plate.

The phase difference plate and the optical member using the same according to the present invention are TN type or S type for the purpose of compensating the phase difference due to birefringence of the liquid crystal cell, such as expansion of the viewing angle and improvement of the contrast.
TFT type using a liquid crystal cell showing birefringence such as TN type or M type
It can be preferably used for various display devices such as an IM type. In this case, as the retardation plate for optical compensation, a retardation plate that compensates for the retardation due to birefringence of the liquid crystal cell over a wide viewing angle range is preferably used.

[0046]

EXAMPLE 1 20% by weight of methylene dichloride of polycarbonate having a molecular weight of about 80,000 and comprising a polycondensate of phosgene and bisphenol A
The solution was continuously cast on a steel drum, which was sequentially peeled off and dried to obtain a long polycarbonate film having a thickness of 60 μm and a phase difference of almost 0, and a 60 μm-thick two-sided polycarbonate film on both sides of the film. A production member comprising a heat-shrinkable film made of an axially stretched polyester film and having a maximum length of fish eyes of 400 μm and a maximum projection height of 5.2 μm and an acrylic adhesive layer having a thickness of 25 μm was bonded through the adhesive layer. Thereafter, a shrinkage treatment of 5% in the width direction and 15% in the length direction was performed at 162 ° C. with a stretching machine to peel off the production member, and a retardation plate was continuously obtained. The above manufacturing conditions were set so that the front retardation of the obtained retardation plate was approximately 120 nm (the same applies hereinafter).

Example 2 A heat-shrinkable film made of a 28-μm-thick biaxially stretched polyester film having a maximum fisheye length of 420 μm and a maximum projection height of 7.8 μm was provided with an acrylic adhesive layer having a thickness of 25 μm. A retardation plate was obtained in the same manner as in Example 1 except that the following production members were used.

Example 3 A heat-shrinkable film made of a uniaxially stretched polyester film having a thickness of 28 μm and having a maximum fisheye diameter of 420 μm and a maximum projection height of 7.8 μm was provided with an acrylic adhesive layer having a thickness of 25 μm. A retardation plate was obtained in the same manner as in Example 1 except that the produced member was subjected to a 10% shrinkage treatment in the width direction at 162 ° C. using a stretching machine.

Comparative Example A heat-shrinkable film made of a biaxially stretched polyester film having a thickness of 60 μm and having a maximum major axis of fish eyes of 700 μm and a maximum projection height of 20.6 μm (number of fish eyes having a major axis of 500 μm or more: 322 / m ²⁾ ) 25μm thick
A retardation plate was obtained in the same manner as in Example 1 except that a production member provided with an acrylic pressure-sensitive adhesive layer was used. The second largest fisheye in the heat-shrinkable film had a major axis of 520 μm and a protrusion height of 11.3 μm.

Evaluation Test The appearance and the yield of the retardation films obtained in Examples and Comparative Examples were examined, and the productivity of the liquid crystal display device was comprehensively evaluated. The results are shown in the following table. The appearance is based on the product having a size of 15 inches, depending on the presence or absence of fisheye scars and the degree thereof. Fisheye mark Yield (%) Productivity Example 1 None 82 Excellent Example 2 Yes (* 1) 75 Good Example 3 None 81 Excellent Comparative Example Yes (* 2) 53 Poor * 1: No appearance defect * 2: Unevenness with poor appearance

As described above, in Examples 1 and 3, no irregularities on the surface due to the reflection of fish eyes were observed on the retardation plate, and in Example 2, irregularities on the surface due to the reflection of the fish eye were observed on the retardation plate. The irregularities were small enough to be practically used, and in any of the examples, the yield in the post-process such as the attachment of an adhesive layer was good, and the productivity of the liquid crystal display device was improved. On the other hand, in the comparative example, surface irregularities that cannot be put to practical use are recognized as appearance defects due to reflection of fish eyes on the retardation plate, and inconveniences such as bubbles being mixed due to the irregularities when the adhesive layer is attached in a later process occur. However, the productivity of the liquid crystal display device was significantly reduced.

A polarizing plate was adhered to both sides of the TN type liquid crystal cell via the retardation plates obtained in Examples 1 to 3, and the contrast in the front direction and the display characteristics due to the change in viewing angle were examined. There was no change in display characteristics over a wide viewing angle range, and the liquid crystal display device was high in display quality and excellent in visibility.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H049 BA02 BA06 BB03 BB22 BB44 BB45 BB48 BB54 BC03 BC22 2H091 FA08X FA08Z FA11X FA11Z FB02 FC01 FC08 FD14 GA17 LA12 LA17 LA19

Claims (6)

[Claims] 1. A production member for bonding a thermoplastic film, treating the thermoplastic film under the action of heat shrink force, and then peeling to obtain a retardation plate, wherein the major axis of the existing fish eye is 500 μm. Less than or projecting height 10μm
A member for manufacturing a retardation plate, comprising the following heat-shrinkable film. 2. The method according to claim 1, wherein the thickness is 5 to 500 μm.
Production member made of m heat shrinkable film. 3. The production member according to claim 1, wherein the production member has an adhesive layer. 4. The production member according to claim 1, wherein the production member is adhered to one or both surfaces of a thermoplastic film, and the thermoplastic film is stretched at least in one direction in a vertical and horizontal direction under the action of shrinkage of the production member by heating. A method for producing a retardation plate, comprising, after stretching or shrinking, peeling off the production member. 5. An optical member comprising a laminate of a retardation plate and a polarizing plate according to the production method of claim 4. 6. A liquid crystal display device comprising a retardation plate or a polarizing plate and the retardation plate according to the method of claim 4 on at least one side of a liquid crystal cell.