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WO1999000700A1 - Ecran de television a projection - Google Patents

Ecran de television a projection Download PDF

Info

Publication number
WO1999000700A1
WO1999000700A1 PCT/KR1998/000188 KR9800188W WO9900700A1 WO 1999000700 A1 WO1999000700 A1 WO 1999000700A1 KR 9800188 W KR9800188 W KR 9800188W WO 9900700 A1 WO9900700 A1 WO 9900700A1
Authority
WO
WIPO (PCT)
Prior art keywords
projection television
screen
die
television screen
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR1998/000188
Other languages
English (en)
Inventor
Deokjoo Kim
Jeongsu Yu
Youngki Park
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Corp
Original Assignee
LG Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Chemical Co Ltd filed Critical LG Chemical Co Ltd
Priority to JP50546799A priority Critical patent/JP2002508084A/ja
Publication of WO1999000700A1 publication Critical patent/WO1999000700A1/fr
Anticipated expiration legal-status Critical
Priority to US10/421,994 priority patent/US6937393B2/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/62—Translucent screens
    • G03B21/625—Lenticular translucent screens
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens

Definitions

  • the present invention relates to a projection television receiver and, more particularly, to a viewing screen for a projection television receiver.
  • projection television screen The viewing screen of a projection television receiver (hereinafter “projection television screen”) is usually wider than the viewing screen of a conventional television receiver and thus weighs much more than the viewing screen of the conventional television receiver.
  • a projection screen should be mechanically strong but not too heavy. Since a projection television screen is an exposed component of the television receiver, it is vulnerable to impact damage when the receiver is handled, used or moved.
  • a conventional projection television screen is made from an extruded polymethylmetacrylate(PMMA) sheet, which may be either a plain sheet or a sheet with shapes formed upon it to facilitate its various functions.
  • PMMA sheets are heavy and have low mechanical strength and especially low impact strength. When a conventional projection screen is broken by an external impact, the pieces are very dangerous because they have many sharp edges.
  • An object of the present invention is to provide a projection television screen that it is safe, light, and mechanically strong.
  • Another object of the present invention is to provide a continuous-mode process for making a projection television screen that is safe, light, and mechanically strong.
  • the projection television screen of the present invention is made of a thin transparent film with high mechanical strength. Shapes may be formed on the surface of the film made of photo-curing resin in order to perform the necessary functions. After that, another type of film could be attached onto the shape formed on the substrate.
  • the resultant structure according to the present invention is used as a projection television screen.
  • Yet another object of the present invention is to provide a manufacturing process for providing a screen which is described above. While in prior art a screen has been manufactured in a non-continuous way because only a planar shaped die is available in the prior art, with the manufacturing process of the present invention, a roll-shaped die can be easily fabricated using an electroforming method. Thus, continuous manufacture of a screen can be accomplished.
  • FIG. 1 illustrates the use of a projection television screen.
  • FIG. 2 illustrates the structure of a projection television screen according to an embodiment of the present invention.
  • FIG. 3 illustrates the detailed structure of the projection television screen shown in Figure 2.
  • FIG. 4 illustrates a process of manufacturing a projection television screen according to an embodiment of the present invention.
  • FIG. 5 illustrates a conventional process of manufacturing an objective lens.
  • FIG. 6 illustrates a conventional process of manufacturing a Fresnel lens.
  • FIG. 7 illustrates a second conventional process of manufacturing a Fresnel lens.
  • FIG. 8 illustrates a process of fabricating an electroforming roll suitable for manufacturing the Fresnel lens and the objective lens of the present invention.
  • a projection television screen 1 of the present invention comprises: a Fresnel lens 4; an objective lens 5 adjacent to and optically aligned with the Fresnel lens 4; and a transparent protective sheet 6 adjacent to the surface of the objective lens 5 furthest from the fresnel lens 4.
  • the Fresnel lens 4 comprises: a first transparent substrate 8; and a phase grating 7 mounted on the surface of the first substrate 8 nearest the objective lens 5.
  • the Fresnel lens 5 collimates light from an image protector 3 and uniformly projects the collimated light onto the surface of the objective lens nearest the Fresnel lens 4.
  • the phase grating 7 is formed from a resin that is cured by exposure to ultraviolet light(hereinafter "ultra-violet resin") after the shape of the grating has been impressed upon the fluid resin.
  • the objective lens 5 comprises: a second transparent substrate 10; a plurality of lenticular structures 9 mounted on both surfaces of the second substrate 10; and an anti-reflective layer 11 mounted on the surface of the second substrate 10 furthest from the Fresnel lens 4.
  • the objective lens 5 collects parallel red, green, and blue image beams from the Fresnel lens 4 at a predetermined position of each of the color cell.
  • the anti-reflective layer 11 absorbs stray ambient light and thus brightens the images on the screen.
  • the ultra-violet resin used to make the grating 7 may also be employed to make the lenticular structures 9.
  • the type of film used for the substrate 8 of the Fresnel lens may also be employed for the substrate 10 of the objective lens.
  • a diffusion agent may be used, depending on the degree of light diffusion required, the ultra-violet resin used to make the grating 7.
  • An ultra-violet curing black ink with extinction and adhesion characteristics is employed, for the anti-reflective layer 11.
  • the protective sheet 6 protects the Fresnel and objective lenses against damage from outside.
  • the material of the protective sheet 6 may be the same as that of the substrate 8 of the Fresnel lens or the substrate 10 of the objective lens. If desired, various coatings such as an anti-reflection coating and a scratch-resistant coating may be applied to the protective sheet 6.
  • the protective sheet may also be colored.
  • the viscosity of the ultra-violet resin used to make the grating 7 and the lenticular structures 9 ranges from 100 to 3000 cps at 25 °C .
  • the resin transmits more than 75 % of the light incident on it.
  • the viscosity of the ultra-violet resin lies within the range 500 to 1500 cps at 25 °C , and the transmissivity of the resin is more than 85 %.
  • the resin could be sufficiently spread on the surface of a shaping roller 12, when the viscosity is less than 100 cps, process control would not be easy and a significant amount of low-boiling point material would be lost. If the resin's viscosity were more than 3000 cps, spray coating process would be difficult and air bubbles could well be formed because the shaping roller 12 would not be sufficiently wet by the resin.
  • Materials which may be used for the ultra-violet resin of the grating 7 and the lenticular structures 9 include: urethane acrylate resin, epoxy acrylate resin, ester acrylate resin, ether acrylate resin, and mixtures thereof.
  • the transparent substrate 8 of the Fresnel lens 4, the transparent substrate 10 of the objective lens 5, and the protective sheet 6 preferably have thickness of 10-250 /an, light transmissivity of 75 % or more and a tensile strength of at least 600 kg/crf, and more preferably thickness of 50-150 m, light transmissivity of 85 % or more and a tensile strength of at least 1000 kg/cm 2 . If the thickness were less than 10 /m or the tensile strength less than 600 kg/cm 2 , the screen 1 could be easily damaged and the film torn during the preparation of the screen.
  • the thickness were more than 250 //m, the total thickness and weight of the screen 1 would be too great and the advantages of employing a film in the present invention would be lost. If the transmissivity were less than 75 %, the transmissivity the screen 1 would be too low.
  • Materials which may be used for the transparent film of the substrate 8 of the Fresnel lens, the substrate 10 of the objective lens, and the protective sheet 6 include: polyester, polyestersulfon, polyamide 6, polyamide 66, polycarbonate, polyestersulfon, polyester ketone, polyesterimide, polyacrylate, and mixtures thereof.
  • Fig. 4 illustrates an apparatus for making shapes on one surface or both surfaces of the substrate of the Fresnel lens 4 and the objective lens 5 according to the present invention, the apparatus comprising a shaping roller 12; a device 13 for applying liquid resin to the substrate; an ultra-violet irradiating device 14; and a roller 15 for supplying the substrate film.
  • the shaping roller 12 is easily replaceable in order to impress one surface or both surfaces of the substrate with various shapes.
  • Fig. 5 illustrates a conventional apparatus used for manufacturing an objective lens.
  • a film extruded by an extruder 17 is shaped by a shaping roller 12 and thereafter cooled by a cooling roller 18 and drawn by a drawing roller 19.
  • Such an apparatus cannot be used for manufacturing a thin-film objective lens.
  • FIG. 6 illustrates a conventional process of manufacturing a Fresnel lens.
  • a liquid ultraviolet resin 21 is poured into a flat mold 20 to shape a Fresnel lens.
  • the flat mold 20 is then covered with a panel 22 which forms the substrate of the Fresnel lens.
  • the resin 21 is passed through a roller 23 and is exposed to an ultra-violet irradiating device 14.
  • the conventional method of Fig. 6 is not applicable to mass production and the process can be operated only in a batch mode. A thin-film type substrate could not easily be used in the method illustrated by Figure 6.
  • FIG. 7 illustrates a conventional process of manufacturing a Fresnel lens using a press. In the process shown in Fig.
  • a Fresnel substrate 25 is inserted between the flat mold 20 and a planar upper die 24.
  • the Fresnel substrate 25 is then heated, pressed, rolled and released.
  • this press process has the disadvantages of long manufacturing time, and short duration of the die, and consequent low productivity.
  • FIG. 8 illustrates a process of manufacturing a shaping roller for forming a Fresnel lens and an objective lens according to an embodiment of the present invention.
  • the Fresnel lens 4 and the objective lens 5 can be manufactured in continuous mode due to the use of a roll shaped die rather than the planar die of the prior art.
  • the electroforming method illustrated in Fig. 8 may be used, for manufacturing a shaping roller.
  • a silicone rubber die mold 26 is patterned using a planar die 20.
  • the patterned silicone rubber die mold 26 is made into a tube-type die by a reinforcing steel tube 27.
  • a metal electroforming die 28, made, for example, of nickel chromium has been fabricated at the inner side of the tube-type silicone rubber die mold 26 by means of an electroforming method, the reinforcing steel tube 27 is removed, which leaves only the electroformed metal die 28.
  • the shaping roller is completed by inserting and fixing a cylindrical steel tube roller with shaft into the electroformed metal die 28.
  • Urethane acrylate resin is used as the ultra-violet resin of the grating 7 and the lenticular structures 9.
  • Polyester film is used for the substrate 8 of the Fresnel lens, the substrate 10 of the objective lens, and the protective sheet 6.
  • the properties of urethane acrylate resin and polyester film used in the present example are summarized in tables 1 and 2, respectively.
  • a comparative product is manufactured as a prior art product.
  • Polymethylmetacrylate is used for the substrate 8 of the Fresnel lens and the substrate 10 of the objective lens.
  • Urethane acrylate is used for the grating 7.
  • the projection tv screen 1 weights of 84 % less and has tensile strength 4.5 times greater than conventional television screen.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

L'invention concerne un écran pour récepteur de télévision à projection, et plus particulièrement un écran de télévision à projection comportant un substrat mince. Antérieurement, les écrans de télévision à projection constitués d'un matériau épais et fragile posaient des problèmes tels que des difficultés de manipulation en raison de leur poids, un coût de fabrication élevé et des risques importants de blessure dus aux nombreux bords tranchants des débris lorsque l'écran se brisait. Pour résoudre ces problèmes, l'invention propose un substrat d'écran formé d'une couche mince et solide, qui permet de fabriquer un écran de télévision à projection facile à manipuler du fait de son poids considérablement réduit et ne risquant pas de blesser les personnes s'il se brise.
PCT/KR1998/000188 1997-06-30 1998-06-30 Ecran de television a projection Ceased WO1999000700A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP50546799A JP2002508084A (ja) 1997-06-30 1998-06-30 投写型テレビスクリーン
US10/421,994 US6937393B2 (en) 1997-06-30 2003-04-23 Projection television screen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1019970029299A KR100485218B1 (ko) 1997-06-30 1997-06-30 투사형텔레비젼스크린
KR1997/29299 1997-06-30

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US09446812 A-371-Of-International 1999-12-23
US10/137,956 Division US20020171929A1 (en) 1997-06-30 2002-05-02 Methods for manufacturing display device lenses

Publications (1)

Publication Number Publication Date
WO1999000700A1 true WO1999000700A1 (fr) 1999-01-07

Family

ID=19512355

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR1998/000188 Ceased WO1999000700A1 (fr) 1997-06-30 1998-06-30 Ecran de television a projection

Country Status (3)

Country Link
JP (1) JP2002508084A (fr)
KR (1) KR100485218B1 (fr)
WO (1) WO1999000700A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1347312A1 (fr) * 2002-03-11 2003-09-24 Eastman Kodak Company Une lentille complexe de polymère pour la diffusion de la lumière visible, qui est formée à la surface
US7165959B2 (en) 2003-09-09 2007-01-23 3M Innovative Properties Company Apparatus and method for producing two-sided patterned webs in registration
US7224529B2 (en) 2003-09-09 2007-05-29 3M Innovative Properties Company Microreplicated article
US7444932B2 (en) 2005-03-09 2008-11-04 3M Innovative Properties Company Apparatus and method for making microreplicated article
EP1257871A4 (fr) * 2000-01-04 2008-11-26 Digislide Holdings Pty Ltd Projecteur de diapositives d'images doubles et/ou de video
US8968629B2 (en) 2005-03-09 2015-03-03 3M Innovative Properties Company Apparatus and method for producing two-sided patterned web in registration

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010036713A (ko) * 1999-10-11 2001-05-07 성재갑 배면 투사형 텔레비전 스크린의 렌티큘라 렌즈

Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH02157702A (ja) * 1988-12-09 1990-06-18 Mitsubishi Rayon Co Ltd レンズシートの製造方法
JPH0375702A (ja) * 1989-08-18 1991-03-29 Mitsubishi Rayon Co Ltd レンズシートの製造方法
JPH04329501A (ja) * 1991-05-01 1992-11-18 Mitsubishi Rayon Co Ltd レンズシート
JPH05341385A (ja) * 1992-06-08 1993-12-24 Mitsubishi Rayon Co Ltd レンズシート

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JP2610029B2 (ja) * 1987-12-28 1997-05-14 ソニー株式会社 成形型の製造方法
JP3366488B2 (ja) * 1994-05-02 2003-01-14 大日本印刷株式会社 透過型スクリーン

Patent Citations (4)

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JPH02157702A (ja) * 1988-12-09 1990-06-18 Mitsubishi Rayon Co Ltd レンズシートの製造方法
JPH0375702A (ja) * 1989-08-18 1991-03-29 Mitsubishi Rayon Co Ltd レンズシートの製造方法
JPH04329501A (ja) * 1991-05-01 1992-11-18 Mitsubishi Rayon Co Ltd レンズシート
JPH05341385A (ja) * 1992-06-08 1993-12-24 Mitsubishi Rayon Co Ltd レンズシート

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Title
PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 405, (P-1100), 1990; & JP,A,02 157 702 (MITSUBISHI RAYON CO., LTD.) 18-06-90. *
PATENT ABSTRACTS OF JAPAN, Vol. 15, No. 242, (P-1217), 1991; & JP,A,03 075 702 (MITSUBISHI RAYON CO., LTD.) 29-03-91. *
PATENT ABSTRACTS OF JAPAN, Vol. 17, No. 170, (P-1515), 1993; & JP,A,04 329 501 (MITSUBISHI RAYON CO., LTD.) 18-11-92. *
PATENT ABSTRACTS OF JAPAN, Vol. 18, No. 178, (P-1717), 1994; & JP,A,05 341 385 (MITSUBISHI RAYON CO., LTD.) 24-12-93. *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1257871A4 (fr) * 2000-01-04 2008-11-26 Digislide Holdings Pty Ltd Projecteur de diapositives d'images doubles et/ou de video
EP1347312A1 (fr) * 2002-03-11 2003-09-24 Eastman Kodak Company Une lentille complexe de polymère pour la diffusion de la lumière visible, qui est formée à la surface
US6721102B2 (en) 2002-03-11 2004-04-13 Eastman Kodak Company Surface formed complex polymer lenses for visible light diffusion
CN100403060C (zh) * 2002-03-11 2008-07-16 罗门哈斯丹麦金融有限公司 透明聚合物膜
US7165959B2 (en) 2003-09-09 2007-01-23 3M Innovative Properties Company Apparatus and method for producing two-sided patterned webs in registration
US7224529B2 (en) 2003-09-09 2007-05-29 3M Innovative Properties Company Microreplicated article
US7417798B2 (en) 2003-09-09 2008-08-26 3M Innovative Properties Company Microreplicated article
US7444932B2 (en) 2005-03-09 2008-11-04 3M Innovative Properties Company Apparatus and method for making microreplicated article
US8968629B2 (en) 2005-03-09 2015-03-03 3M Innovative Properties Company Apparatus and method for producing two-sided patterned web in registration

Also Published As

Publication number Publication date
KR19990005131A (ko) 1999-01-25
KR100485218B1 (ko) 2005-08-10
JP2002508084A (ja) 2002-03-12

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