JP2003043219A - Method for correcting projection defect in light diffusing member and light diffusing member and transfer film by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently correct projection defects and to provide a light diffusing member and a transfer film to be used for a diffusing reflector or the like of a reflection type LCD having preferable reflection characteristics. SOLUTION: The method for correcting projection defects of a light diffusing member or a base film is carried out by irradiating the projection defects of the rugged face of the light diffusing member or the projection defects in the base film forming the rugged face of the light diffusing member with laser light at least once to correct the projection defects.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a reflection type liquid crystal display device which does not require a backlight, an anti-glare film which is arranged on the front surface of the display device to prevent glare, and a solar cell which requires high efficiency. The present invention relates to a method for correcting protrusion defects of a light diffusing member, a light diffusing member using the same, and a transfer film used for manufacturing the light diffusing member.

[0002]

2. Description of the Related Art Liquid crystal display (hereinafter abbreviated as LCD)
Taking advantage of its thinness, small size, and low power consumption, is currently used for display parts of watches, calculators, TVs, personal computers and the like. Furthermore, in recent years, color LCDs have been developed and OA / AV
It is beginning to be used in many applications such as navigation systems, viewfinders, personal computer monitors, etc., centering on equipment, and the market is expected to expand rapidly in the future. In particular, a reflective LCD that reflects light incident from the outside to display an image is attracting attention as a portable terminal device application because it does not require a backlight and thus consumes less power and can be made thinner and lighter. ing.

Conventionally, a twisted nematic system and a super twisted nematic system have been adopted for reflective LCDs, but in these systems, half of the incident light is not used for display due to the linear polarizer, and the display is dark. turn into. Therefore, we reduced the number of polarizers to one and combined it with a retardation film or a phase transition type guest.
Host-based display modes have been proposed.

In order to efficiently use external light in a reflective LCD to obtain a bright display, it is necessary to further increase the intensity of light scattered in a direction perpendicular to the display screen with respect to incident light from all angles. There is. Therefore, it is necessary to control the reflection film on the reflection plate so as to obtain appropriate reflection characteristics. A method in which a substrate is coated with a photosensitive resin, patterned using a photomask to form irregularities, and a metal thin film is formed to form a diffuse reflector (Japanese Patent Laid-Open No. 4-2432).
No. 26) is proposed. On the other hand, JP 2000-
Japanese Patent No. 267088 discloses a reflective LCD with high manufacturing efficiency.
There has been proposed a light diffusing member having a light diffusing surface such as a light diffusing reflector for improving light diffusing characteristics, and a transfer film used for manufacturing the light diffusing member. In this method, the surface to which the uneven shape of the metal plating film surface is transferred or the surface to which the uneven shape of the metal plating film surface is transferred is further transferred and used as a light diffusing member.

[0005]

In the above method, if there is an abnormal protrusion due to a foreign substance or a scratch on the surface of the metal plating film,
A dent or a protrusion is formed on the light diffusion member or the transfer film which is the transfer surface. For example, when a light diffusing member having a protrusion is used for a diffuse reflection plate for a reflective LCD, it adversely affects the flatness of a flattening film or a color filter laminated on the diffusion reflection plate at the protrusion, and further the liquid crystal cell. Since the gap is changed, the liquid crystal is disordered in alignment, resulting in display unevenness, which makes it impossible to obtain a good display. For the method of correcting the defect of the color filter, see JP-A 05-
No. 07111) has been proposed. However, the defect correction at the stage where various thin films are stacked may cause further display unevenness due to peeling between the thin films and foreign substances generated during the correction. In the reflective LCD, it is necessary to correct the protrusion defect in the process of manufacturing the light diffusion member. The present invention provides a light diffusing member and a transfer film which are used for a reflective diffusing plate for a reflective LCD, etc., which has a good reflecting property by efficiently correcting protrusion defects.

[0006]

According to the present invention, [1] a projection defect of a light diffusing member or a projection defect of a base film forming the projection and depression surface of a light diffusing member is irradiated with laser at least once to correct the projection defect. There is provided a method for repairing a projection defect of a light diffusing member or a base film. [2] There is also provided a light diffusing member having an uneven light diffusing surface in which protrusion defects are corrected by the method described in [1] above. [3] There is also provided a light diffusing member having a light diffusing surface that is the surface of the base film on which the projection defects have been corrected by the method according to the above [1], to which the concavo-convex shape is transferred. Also, [4]
The above [2] or [3] in which a reflecting film is formed on the light diffusion surface.
The light diffusing member according to 1. is provided. [5] The light diffusion member according to any one of [2] to [4] above is used as a temporary support, and a thin film layer is laminated on the uneven surface side of the temporary support. Provided is a transfer film in which a surface not laminated on a support constitutes an adhesive surface to a transfer target substrate. [6] A light diffusing member using the light diffusing member according to any one of the above [2] to [4] as a diffuse reflection plate for a reflective liquid crystal display device. The present invention is
An excellent light diffusing member is provided by correcting a protrusion defect of the light diffusing member or the base film.
Specifically, the uneven surface of the light diffusion member or the projection defect of the base film is corrected by laser irradiation. Check the protrusion defects with a microscope and irradiate each protrusion defect at least once to several times with a YAG laser etc. until the height of the defect becomes the same as the normal irregular shape. Modify to a level that is equivalent to the shape.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION According to the method for repairing protrusion defects of the present invention, the uneven surface of the light diffusing member or the uneven surface of the light diffusing member is formed by using the metal roll having the uneven shape. Is corrected so that a light diffusing member such as a diffusive reflection plate for a reflective LCD has good reflection characteristics. The surface shape of the unevenness of the light diffusion member is not particularly limited,
Not only the composite plane, but also a concave or convex surface, a concavo-convex composite curved surface, and a concave or convex surface similar to a spherical surface or a paraboloid, or a concavo-convex composite curved surface is preferable. In particular, in the case of a diffuse reflection plate for a reflective LCD, it is necessary to form a light diffusing surface in the LCD cell. Therefore, the average height difference H is preferably as small as possible in consideration of the cell gap and Δnd. As the uneven shape, the difference in height between the concave portion and the convex portion is 0.1 μm to 15 μm,
Furthermore, 0.1 μm to 5 μm, the pitch of the convex portions is 0.7.
It is preferable that the thickness is not less than μm and not more than 150 μm or the pixel pitch, whichever is smaller, and further preferably not less than 2 μm and not more than 150 μm or the pixel pitch, whichever is smaller.

As shown in FIG. 1, the method for repairing the projection defect of the light diffusing member of the present invention repairs the projection defect by irradiating the projection defect with laser at least once. In this case, the convex portion of the uneven surface can be corrected by laser, but the concave portion becomes difficult and can be further corrected by laser after overlaying. As a highly efficient method, the convex part of the uneven surface is corrected, and when the base film to which the uneven surface is transferred is made, the shape of the uneven surface is transferred in the opposite way, so it is difficult to correct the uneven surface of the prototype concave surface. However, the base film has a convex surface, which makes it easy to correct by a laser, and by using this modified base film as a mold, it is possible to obtain a light diffusing member having the same uneven surface as the original mold with less defects on the uneven surface. it can. The light diffusing member produced by the method for correcting a projection defect of a light diffusing member of the present invention is provided with an undercoat layer on the surface of a base film as shown in FIG. Then
Further, a transfer film can be obtained by forming a thin film layer on the side of the undercoat layer to which the modified uneven surface is transferred and providing a cover film for protecting the surface. In this case, a diffusion member obtained by providing an undercoat layer on the base film and transferring the uneven surface is used as a temporary support, and a thin film layer is laminated on the uneven surface side of the temporary support. Then, as shown in FIG. 3, the cover film is peeled off, and the surface of the thin film layer of the transfer film which is not laminated on the temporary support (base film, undercoat layer) is laminated on the glass substrate to be the substrate to be transferred. By irradiating ultraviolet rays to cure the thin film layer and peeling off the base film and the undercoat layer, it is possible to obtain a light diffusing member on which a thin film layer having a concavo-convex shape transferred to a glass substrate is formed. Furthermore, by providing a reflection film on the unevenness forming surface of the light diffusion member obtained as shown in FIG. 4, the reflection characteristics can be improved. For the reflective film, a material may be appropriately selected depending on the wavelength region to be reflected. For example, in a reflective LCD display device, a metal having a high reflectance in the visible light wavelength region of 300 nm to 800 nm, such as aluminum, gold or silver. Are formed by a vacuum deposition method, a sputtering method, or the like. Further, a reflection-increasing film (described in Optical Outline 2 (Junpei Tsujiuchi, Asakura Shoten, 1976)) may be laminated by the above method. The thickness of the reflective film is preferably 0.01 μm to 50 μm. Further, the reflection film may be formed by patterning only a necessary portion by a photolithography method, a mask vapor deposition method or the like.

As the light diffusing member of the present invention, an organic composition is used, which is preferably coated on a support and cured by actinic rays or heat to form a thin film having a thickness of 0.1 μm to 15.0 μm. It is preferable to use an organic composition obtained by curing a photosensitive resin composition or a positive photosensitive resin composition, or a thermosetting resin composition with actinic rays or heat, or with actinic rays and heat. For example, polyolefins such as polyethylene and polypropylene, ethylene and vinyl acetate copolymers, ethylene and acrylate copolymers, ethylene copolymers such as ethylene and vinyl alcohol, polyvinyl chloride, vinyl chloride and vinyl acetate copolymers. , Copolymers of vinyl chloride and vinyl alcohol, polyvinylidene chloride, polystyrene, styrene copolymers such as styrene and (meth) acrylic acid ester, polyvinyltoluene, vinyltoluene such as vinyltoluene and (meth) acrylic acid ester At least one or more selected from copolymers, poly (meth) acrylic acid esters, copolymers of (meth) acrylic acid esters such as butyl (meth) acrylate and vinyl acetate, synthetic rubbers, and cellulose derivatives. These organic polymers can be used. If necessary, a photoinitiator, a monomer having an ethylenic double bond, or the like can be added for curing after forming the unevenness. If necessary, dyes, organic pigments, inorganic pigments, powders and composites thereof may be used alone or in combination.
The film thickness, dielectric constant, hardness, refractive index, and spectral transmittance of these light diffusion members are not particularly limited. These light diffusion members may retain the function as a support. Further, these light diffusing members may be laminated layers of organic compositions.

As the base film, one that is chemically and thermally stable, has an uneven shape, and can be formed into a sheet or plate can be used. Specifically, polyolefins such as polyethylene and polypropylene, polyvinyl chloride, polyvinyl halides such as polyvinylidene chloride, cellulose acetate, nitrocellulose, cellulose derivatives such as cellophane, polyamide, polystyrene, polycarbonate, polyimide, polyester, or It is a metal thin film such as aluminum or copper, a metal foil, or the like. Of these, particularly preferred is biaxially stretched polyethylene terephthalate, which has excellent dimensional stability.

Further, a base film may be formed by forming an undercoat layer on a base film which is not provided with an uneven shape and forming an uneven shape on the undercoat layer. As the undercoat layer,
Polyolefins such as polyethylene and polypropylene,
Ethylene and vinyl acetate copolymer, ethylene and acrylic ester copolymer, ethylene copolymer such as ethylene and vinyl alcohol, polyvinyl chloride, vinyl chloride and vinyl acetate copolymer, vinyl chloride and vinyl alcohol copolymer Polymers, polyvinylidene chloride, polystyrene, styrene and styrene copolymers such as (meth) acrylic acid esters, polyvinyltoluene, vinyltoluene and (meth)
Vinyltoluene copolymers such as acrylates,
At least one organic polymer selected from poly (meth) acrylic acid ester, a copolymer of butyl (meth) acrylate and (meth) acrylic acid ester such as vinyl acetate, synthetic rubber, and cellulose derivative is used. be able to. A photoinitiator, a monomer having an ethylenic double bond, or the like can be added, if necessary, for curing after giving the uneven shape. Alternatively, a negative or positive photosensitive resin may be used.

The method of correcting the projection defect of the light diffusing member or the base film of the present invention uses a method of removing by laser irradiation. The laser light is YAG laser, glass laser, He-Ne laser, He-Xe laser, He-C.
d laser, ion laser, N ₂ laser, CO ₂ laser, variable wavelength laser, ArCl, ArF, KrC
Heteroexcimer laser of rare gas halide such as L, F ₂
And rare gas excimer lasers such as Ar ₂ and the like.

Further, a thin film layer of an organic composition to be a light diffusing member is laminated on the uneven surface of the base film having a surface on which the uneven shape is transferred, and the surface of the thin film layer not laminated on the base film is The light diffusing member may be manufactured by using a transfer film that constitutes an adhesive surface to the substrate to be transferred. As shown in FIG. 3, a base film, an undercoat layer, a thin film layer, and a cover film processed to have a large number of fine irregularities on the surface by pressing a metal plating film having a large number of fine irregularities on the surface are Using the transfer films sequentially laminated, the cover film is laminated while the thin film layer is in contact with the substrate, the thin film layer, the undercoat layer and the base film are laminated on the substrate, and the base film and the undercoat layer are peeled off. As a result, a light diffusing member having a large number of fine irregularities can be formed on the surface of the thin film layer on the substrate. By further forming a reflection film of a metal thin film of aluminum or the like on this, a diffusion reflection plate which is a desired light diffusion member can be obtained (FIG. 4). Further, if a difference in refractive index is provided between the media forming the light diffusing surface instead of the reflecting film, a desired light diffusing plate can be obtained. In addition, using a transfer film in which a reflective film is laminated between the thin film layer and the base film in advance, the cover film is peeled off and laminated so that the thin film layer contacts the substrate, and the thin film layer, the reflective film, and the base film are placed on the substrate. A desired diffuse reflection plate is obtained by laminating and peeling only the base film.

As the thin film layer, a composition containing a deformable organic polymer, an inorganic compound or a metal can be used, but an organic polymer composition which can be coated on a support and wound into a film is preferable. Use things. If necessary, dyes, organic pigments, inorganic pigments, powders and composites thereof may be used alone or in combination.

A photosensitive resin composition or a thermosetting resin composition may be used for the thin film layer. The dielectric constant, hardness, refractive index, and spectral transmittance of these thin film layers are not particularly limited.

Among such materials, it is preferable to use one having good adhesion to the substrate to be transferred and good peelability from the base film. For example, acrylic resin, polyolefin such as polyethylene and polypropylene, polyvinyl halide such as polyvinyl chloride and polyvinylidene chloride, cellulose derivative such as cellulose acetate, nitrocellulose, cellophane, polyamide, polystyrene, polycarbonate, polyimide, polyester and the like are used. be able to. Further, a photosensitive material can be used. In some cases, it is possible to use a photosensitive resin that can be developed with an alkali or the like so that only the portions of the substrate where the irregularities are necessary are left and the unnecessary portions are removed. Heat-resistant,
In order to improve solvent resistance and shape stability, it is also possible to use a resin composition that can be cured by heat or light after forming the unevenness. Further, the adhesion with the substrate can be improved by adding a coupling agent and an adhesiveness-imparting agent. It also includes applying an adhesion promoter to the adhesive surface of the substrate or thin film layer for the purpose of improving adhesion. Hereinafter, the present invention will be specifically described with reference to examples.

[0017]

(Example) (Example 1) While a cylindrical iron base material having a diameter of 130 mm was rotated, copper plating was performed to obtain 20 iron on the iron.
A prototype substrate laminated with 0 μm was obtained. This was polished and processed so that the surface became a mirror surface. Next, this was rotated and continuously pressed with a diamond bite to obtain a roll type in which the shapes in which the tips of the quadrangular pyramids were pressed were arranged side by side. Next, while rotating this, dip it in the copper plating solution shown below, adjust the current so that the current density (current value per 10 square centimeters of plating area) is 8 A, perform bright plating, and then use the same plating solution. The current was adjusted so that the current density was 2 A, and roughening plating was performed, followed by washing with pure water for the purpose of removing the plating solution. Next, in order to suppress the oxidation of copper, while immersing in the nickel plating solution shown below, the current was adjusted so that the current density was 2 A, and bright nickel plating was performed to obtain a transfer master. (Copper plating solution): Copper sulfate 210 g / liter Sulfuric acid 60 g / liter Thiourea 0.01 g / liter Dextrin 0.01 g / liter Hydrochloric acid 0.01 g / liter Liquid temperature 30 ° C. (Nickel plating solution): Nickel sulfate 240 g / liter chloride Nickel 45 g / liter Boric acid 30 g / liter Bath temperature 50 ° C

A polyethylene terephthalate film having a thickness of 100 μm is used as a base film, and the following photo-curable resin solution is applied as an undercoat layer on the base film by a comma coater so as to have a thickness of 20 μm and dried, and then light is applied onto the base film. An undercoat layer made of a curable resin was formed. Next, the transfer mold was pressed, and the photocurable resin was cured by irradiating with ultraviolet rays and separated from the transfer mold, and the inverted shape of the holes of the transfer mold was transferred to the surface of the photocurable resin layer to obtain a base film. . (Photocurable resin solution): Acrylic acid-butyl acrylate-vinyl acetate copolymer 5 parts by weight Butyl acetate (monomer) 8 parts by weight Vinyl acetate (monomer) 2 parts by weight Acrylic acid (monomer) 0.3 parts by weight Hexanediol Acrylate (monomer) 0.2 parts by weight Benzoin isobutyl ether (initiator) 2.5% by weight

On the base film, plating was started with scratches on the transfer master or foreign matter on the transfer master, and projection defects caused by the foreign matter were generated during plating. The protrusion defects had a diameter of 1 μm to 500 μm and a height of 1 μm to 100 μm. After confirming the position of these protrusion defects with a microscope, a YAG laser is irradiated several times for each protrusion defect at an output of 100 to 800 V until the height of the defects becomes equivalent to a normal uneven shape, and the defect height is normal. Corrected to a level that is equivalent to the rough shape. The projection defect thus corrected has an appropriate uneven shape and is sufficiently smaller than a normal uneven shape portion, so that it does not affect the reflection characteristics.

Example 2 A thin film layer forming solution having the following composition was spin-coated on a glass substrate to obtain a thin film layer having a thickness of 2 μm. Next, using the laminator (roll laminator HLM1500, trade name of Hitachi Chemical Techno Plant Co., Ltd.) so that the uneven surface of the base film after repair of Example 1 is in contact with the thin film layer, the substrate temperature is 90 ° C. and the roll temperature is 8
0 ° C, roll pressure 0.686 MPa (7 kg / c
m ² ), and the speed was 0.5 m / min, to obtain a substrate in which a thin film layer, a base resin layer, and a base film were laminated on a glass substrate. Next, using a high pressure mercury lamp, 10
After the exposure of 0 mJ, the base film and the undercoat layer are peeled off,
A thin film layer having an irregularly-shaped surface was obtained on a glass substrate.
This was heat-cured in an oven at 230 ° C. for 30 minutes. In the thin film layer on which the uneven shape is formed, projection defects of the transfer master due to plating with foreign matter on the transfer master, abnormal growth of plating particles on the transfer master, scratches on the base film, thin film layer on the glass substrate Diameter of about 1μm-500μm, height of about 1μm-
There was a protrusion defect of 100 μm. The position of these protrusion defects is confirmed with a microscope, and the YAG laser is output 100 to 8
Irradiation was performed several times for each protrusion defect at 00 V, and the height of the defect was corrected to a level equivalent to that of a normal uneven shape. The projection defect thus corrected has an appropriate uneven shape and is sufficiently smaller than a normal uneven shape portion, so that it does not affect the reflection characteristics. An aluminum thin film was laminated on the above thin film layer by a vacuum deposition method so as to have a thickness of 0.2 μm to form a reflective layer. When an LCD panel was produced using the obtained light diffusing and reflecting plate, a good display without unevenness in display was obtained. (Solution for forming thin film layer): Styrene, methyl methacrylate, ethyl acrylate, acrylic acid as a polymer,
A glycidyl methacrylate copolymer resin was used (Polymer A). It has a molecular weight of about 35,000 and an acid value of 110. Polymer A 70 parts by weight Pentaerythritol tetraacrylate (monomer) 30 parts by weight Irgacure 369 (Ciba Specialty Chemicals) (initiator) 2.2 parts by weight N, N-tetraethyl-4,4'-diaminobenzophenone (initiator) 2.2 parts by weight Propylene glycol monomethyl ether (solvent) 492 parts by weight p-methoxyphenol (polymerization inhibitor) 0.1 parts by weight Perfluoroalkylalkoxylate (surfactant) 0.01 parts by weight

(Example 3) The above-mentioned thin film layer forming solution was spin-coated on a glass substrate to obtain a thin film layer having a film thickness of 2 μm. A polyethylene terephthalate film having a thickness of 100 μm was used as a base film, and the photocurable resin solution of the undercoat layer shown in Example 1 was applied and dried on the base film with a comma coater to a film thickness of 20 μm. Next, the positions of the projection defects of the transfer pattern of Example 1 are transferred and confirmed in advance, and the positions of the parts are confirmed with a microscope so that the height of the defects becomes equal to a normal uneven shape. The output was adjusted and irradiated several times, and the height of the defect was corrected to a level approximately equal to the normal uneven shape. Then, the modified transfer mold is pressed against the undercoat layer formed on the base film, and the photocurable resin in the undercoat layer is cured by irradiating ultraviolet rays to separate it from the transfer mold, and the inverted shape of the holes of the transfer mold is photocured. A base film transferred to the surface of the conductive resin layer was obtained. The position of the protrusion defect of the base film to which this uneven shape is transferred is confirmed with a microscope, and the YAG laser is output until the height of the defect becomes equal to the normal uneven shape.
Irradiation was performed several times at one projection defect at 800 V, and the height of the defect was corrected to a level equivalent to a normal uneven shape. Then, using a laminator (roll laminator HLM1500, trade name of Hitachi Chemical Technoplant Co., Ltd.) such that the uneven surface of the base film in which the protrusion defects are corrected is in contact with the thin film layer, the substrate temperature is 90 ° C., the roll temperature is 80 ° C.,
Lamination was performed at a roll pressure of 0.686 MPa (7 kg / cm ² ) and a speed of 0.5 m / min to obtain a substrate in which a base resin layer and a base film were laminated on a glass substrate. Next, after exposure to 100 mJ with a H line using a high pressure mercury lamp, the base film and the undercoat layer were peeled off to obtain a thin film layer having a surface with irregular irregularities on the glass substrate. Then 2 in the oven
It was heat-cured at 30 ° C. for 30 minutes. The thus-corrected protrusion defect had an appropriate uneven shape, and had a sufficiently small size as compared with a normal uneven shape portion, and thus exhibited particularly excellent reflection characteristics.

[0022]

According to the projection defect repairing method of the present invention, by efficiently repairing the projection defects of the transfer master during the process of manufacturing the light diffusing member, it is possible to obtain a diffuse reflection plate having good reflection characteristics. The light diffusing member can be efficiently manufactured.

[0023]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a light diffusing member before and after a protrusion defect is corrected according to the present invention.

FIG. 2 is a sectional view showing an example of the transfer film of the present invention.

FIG. 3 is a cross-sectional view showing a production example of a light diffusing member using the transfer film of the present invention.

FIG. 4 is a sectional view showing an example of a diffuse reflection plate of the present invention.

[Explanation of symbols]

1. Cover film 2. Thin film layer 3. Undercoat layer 4. Base film 5. Glass substrate 6. YAG laser light 7. Reflective film

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G02F 1/1335 520 G02B 1/10 A (72) Inventor Kyoo Tsuruoka 48 Wadai, Tsukuba, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Stock Research Institute (72) Inventor Nobuaki Takane 48 Wadai, Tsukuba City, Ibaraki Prefecture Hitachi Chemical Co., Ltd. (72) Inventor Hidekuni Banno 48 Taidai, Tsukuba City, Ibaraki Hitachi Chemical Co., Ltd. 72) Inventor Toshikazu Takamatsu 48 Wadai, Tsukuba City, Ibaraki Prefecture F-term in the Research Institute of Hitachi Chemical Co., Ltd. (reference) 2H042 BA04 BA15 BA20 DA02 DA11 DA21 DC02 DC08 DC12 DE04 2H091 FA08X FA08Z FA11X FA11Z FA14Z FA16Z FA37X FA41Z FB02 FC01 FC02FD06 HA07 HA08 HA10 LA30 2K009 AA12 BB02 CC23 CC24 CC34 CC38 DD05 DD15

Claims (6)

[Claims] 1. A light diffusing member or a base, characterized in that a projection defect of a light diffusing member or a projection defect of a base film forming the uneven surface of a light diffusing member is irradiated with laser at least once to correct the projection defect. Method for repairing film projection defects. 2. A light diffusing member having an uneven light diffusing surface, in which protrusion defects are corrected by the method according to claim 1. 3. A light diffusing member having a light diffusing surface, which is a surface on which the uneven shape of the base film having the protrusion defects corrected by the method according to claim 1 is transferred. 4. The light diffusing member according to claim 2, wherein a reflecting film is formed on the light diffusing surface. 5. The light diffusing member according to claim 2 is used as a temporary support, and a thin film layer is laminated on the uneven surface side of the temporary support, and the temporary support of the thin film layer. A transfer film whose surface not laminated on the substrate constitutes an adhesive surface to the substrate to be transferred. 6. A light diffusing member which uses the light diffusing member according to claim 2 as a diffusing reflector for a reflective liquid crystal display device.