EP0599451A1 - Unité de visualisation à angle de vision limité - Google Patents

Unité de visualisation à angle de vision limité Download PDF

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Publication number
EP0599451A1
EP0599451A1 EP93306970A EP93306970A EP0599451A1 EP 0599451 A1 EP0599451 A1 EP 0599451A1 EP 93306970 A EP93306970 A EP 93306970A EP 93306970 A EP93306970 A EP 93306970A EP 0599451 A1 EP0599451 A1 EP 0599451A1
Authority
EP
European Patent Office
Prior art keywords
display unit
visual display
protective screen
screen according
half shell
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.)
Withdrawn
Application number
EP93306970A
Other languages
German (de)
English (en)
Inventor
Giorgio Solero
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.)
Olivetti Tecnost SpA
Original Assignee
Baltea SpA
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 Baltea SpA filed Critical Baltea SpA
Publication of EP0599451A1 publication Critical patent/EP0599451A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8905—Direction sensitive devices for controlled viewing angle

Definitions

  • This invention relates to a protective screen for a visual display unit comprising a transparent plate, a supporting frame for the plate and fixing means for fixing the supporting frame to the body of the visual display unit.
  • a screen of the type defined hereinabove is known, in which the frame can be positioned so as to position the screen adjacent to the visual display unit.
  • This screen protects the user from the glare caused by external light sources. For reasons of confidentiality, it is sometimes necessary to prevent viewing by persons other than those directly in front of the visual display unit.
  • Preferred embodiments of the invention provide a protective screen which allows for viewing of the surface of the visual display unit over only a relatively limited angle while preventing viewing by persons outside this angle and which at the same time can be fixed in a simple manner to the body of the visual display unit.
  • the screen according to the present invention is characterised in that the plate comprises a louvre-type film known per se which defines parallel microwindows in order to define a limited viewing angle and in which the fixing means comprise a first part which can be fixed to the frame and a second part which can be separated from the first part and can be fixed to the visual display unit.
  • a protective screen is designated in general by the reference numeral 6 and is applied to a portable computer 7 of known type which is shown by dash-dotted lines in the drawings and comprises a body 8, a cover 9 and a visual display unit 11 housed in the cover 9.
  • the screen 6 comprises a supporting frame 12 for a transparent plate 13.
  • the supporting frame 12 comprises a front half shell 14 having a seat 16 provided over the entire edge of the front half shell 14, and a rear half shell 17.
  • a plate 13 has a thickness of approximately 1 mm and comprises an intermediate louvre film 18 of slats of black silicone rubber 25 which form the walls of parallel microwindows 22 of very fine layers of transparent silicone rubber.
  • the film 18 is inserted between two outer plates 19 and 21 of polycarbonate.
  • the combination of the black silicone rubber, the transparent silicone rubber and the thickness of the intermediate film 18 creates a row of microwindows or passages 22 so as to define a viewing angle 23 which varies considerably as a function of the variation in the thickness of the intermediate film 18.
  • the thickness of the film 18 is approximately 60°.
  • the outer plate 21 has its respective outer surface treated so that the coefficient of reflection is minimal.
  • the plate 13 with the frame 12 is rectangular, the base being greater than the height, and has dimensions corresponding to those of the visual display unit 11.
  • the direction of the slats 25 is inclined by approximately 13° with respect to a direction perpendicular to that of the base, although the inclination can vary from 1° to 30°.
  • the plate 13 is positioned in the seat 16 and is locked to the rear half shell 17 which is positioned against the front half shell 14 and the two half shells 14 and 17 are thus rigidly welded together by means of ultrasonic welding so as to form one piece with the plate 13.
  • the rear half shell 17 is provided on its two lateral edges with two housings 24 positioned in the vicinity of the upper edge of the half shell 17.
  • the front half shell 14 is provided on its two lateral edges with two toothed projections 26.
  • the fixing means 27 comprise two tables of adhesive velcro 28 each having a first element 28 which is positioned and fixed by means of adhesive in the respective housing 24 of the rear half shell 17 and a second element 29 which is positioned and fixed by means of adhesive on the inner part of the cover 9 adjacent to the visual display unit 11, so that the base of the plate 13 is parallel to the base of the said visual display unit 11.
  • the protective screen 6 is mounted on a portable computer 7 in the following manner.
  • the screen 6 is positioned with the two first elements 28 registering with the two second element 29 and the pressure is applied to the two toothed projections 26 on the front half shell 14 until the elements 28 and 29 are gripped to each other.
  • the screen 6 is thus positioned with the plate 13 in front of the visual display unit 11.
  • the screen 6 is lifted by means of the lower part of the half shell 14 until the elements 28 and 29 of the velcro 27 are freed therefrom.
  • the protective screen 6 described hitherto and used in the non-limiting example on a portable computer 7 allows for confidential viewing of the visual display unit 11 by only the operator over an angle of 60°, the angle being variable between 30° and 90°. It is thus clear that the operator can operate in any area, such as office, aeroplane, train, etc. with complete confidentiality. Moreover, the protective screen 6 can be applied to any visual dislay unit of large or small dimenensions, thereby allowing for confidential viewing. The inclination of the slats 25 between 1° and 30° moreover prevents the formation of interference fringes on the visual display unit 11.
  • the screen 6 can be placed in a container or case 31 (Fig. 4) of nylon fabric having a lower part 32 and an upper part 33.
  • the lower part 32 comprises a central pocket 34 adapted to house the protective screen 6, shown by dash-dotted lines, and two side pockets 36 and 37 of small dimensions to house, e.g. two floppy discs 38, shown by dash-dotted lines, or any other components for use of the protable computer 7.
  • the upper part 33 can be folded along the line 39 in order to engage with a strip of velcro 41 of the lower part 32 in order to keep the container 31 closed.
  • the inner surface of the upper part 33 is rough and moreover has advantageously been stiffened in order to be used as a face for the use of the mouse.

Landscapes

  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Transforming Electric Information Into Light Information (AREA)
EP93306970A 1992-10-01 1993-09-03 Unité de visualisation à angle de vision limité Withdrawn EP0599451A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO920238U 1992-10-01
IT000238 IT227651Y1 (it) 1992-10-01 1992-10-01 Schermo di porotezione per visualizzatore.

Publications (1)

Publication Number Publication Date
EP0599451A1 true EP0599451A1 (fr) 1994-06-01

Family

ID=11410252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93306970A Withdrawn EP0599451A1 (fr) 1992-10-01 1993-09-03 Unité de visualisation à angle de vision limité

Country Status (4)

Country Link
EP (1) EP0599451A1 (fr)
JP (1) JPH06194506A (fr)
CA (1) CA2099428A1 (fr)
IT (1) IT227651Y1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6412889B1 (en) 2000-03-29 2002-07-02 Stomp, Inc. Organizer for computer monitor
WO2002099479A3 (fr) * 2001-02-02 2003-05-15 3M Innovative Properties Co Filtre optique et filtre pour ecran tactile
WO2004003605A1 (fr) * 2002-06-28 2004-01-08 3M Innovative Properties Company Filtre optique, unite d'affichage et unite de panneau tactile
GB2461907A (en) * 2008-07-17 2010-01-20 Sharp Kk Angularly restricted display

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427264A (en) * 1981-01-12 1984-01-24 Optical Coating Laboratory, Inc. Mounting for optical antiglare panel and assembly including the same
GB2161983A (en) * 1984-07-16 1986-01-22 Gen Electric Contrast enhancement structure for color cathode ray tube
US4788094A (en) * 1986-09-25 1988-11-29 Kabushiki Kaisha Tokai Rika Denki Seisakusho Light controlling sheet
US4812709A (en) * 1987-05-29 1989-03-14 Transaction Technology Inc. Privacy screen for a color cathode ray display tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427264A (en) * 1981-01-12 1984-01-24 Optical Coating Laboratory, Inc. Mounting for optical antiglare panel and assembly including the same
GB2161983A (en) * 1984-07-16 1986-01-22 Gen Electric Contrast enhancement structure for color cathode ray tube
US4788094A (en) * 1986-09-25 1988-11-29 Kabushiki Kaisha Tokai Rika Denki Seisakusho Light controlling sheet
US4812709A (en) * 1987-05-29 1989-03-14 Transaction Technology Inc. Privacy screen for a color cathode ray display tube

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6412889B1 (en) 2000-03-29 2002-07-02 Stomp, Inc. Organizer for computer monitor
WO2002099479A3 (fr) * 2001-02-02 2003-05-15 3M Innovative Properties Co Filtre optique et filtre pour ecran tactile
WO2004003605A1 (fr) * 2002-06-28 2004-01-08 3M Innovative Properties Company Filtre optique, unite d'affichage et unite de panneau tactile
GB2461907A (en) * 2008-07-17 2010-01-20 Sharp Kk Angularly restricted display
US8262271B2 (en) 2008-07-17 2012-09-11 Sharp Kabushiki Kaisha Display

Also Published As

Publication number Publication date
IT227651Y1 (it) 1997-12-15
ITTO920238U1 (it) 1994-04-01
ITTO920238V0 (it) 1992-10-01
CA2099428A1 (fr) 1994-04-11
JPH06194506A (ja) 1994-07-15

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): BE CH DE ES FR GB LI NL SE

17P Request for examination filed

Effective date: 19941116

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Effective date: 19950630

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18D Application deemed to be withdrawn

Effective date: 19951111