WO2001038926A1 - A method of selective viewing - Google Patents

A method of selective viewing Download PDF

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Publication number
WO2001038926A1
WO2001038926A1 PCT/NZ2000/000220 NZ0000220W WO0138926A1 WO 2001038926 A1 WO2001038926 A1 WO 2001038926A1 NZ 0000220 W NZ0000220 W NZ 0000220W WO 0138926 A1 WO0138926 A1 WO 0138926A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
images
polarity
window
light
Prior art date
Application number
PCT/NZ2000/000220
Other languages
French (fr)
Inventor
Gabriel Damon Engel
Original Assignee
Deep Video Imaging 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 Deep Video Imaging Ltd filed Critical Deep Video Imaging Ltd
Priority to AU13142/01A priority Critical patent/AU1314201A/en
Publication of WO2001038926A1 publication Critical patent/WO2001038926A1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/288—Filters employing polarising elements, e.g. Lyot or Solc filters
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G09F19/18—Advertising or display means not otherwise provided for using special optical effects involving the use of optical projection means, e.g. projection of images on clouds

Definitions

  • This invention relates to a method of selective viewing.
  • the present invention relates to a method allowing only selected viewers to view an image on a display panel, screen or window.
  • theie may be a window or screen which indicates that someone is in trouble which cannot be seen b ⁇ a burglar, but can be seen by those who can help This system may be used in homes, shops and taxi cabs as an example
  • a scieen foi use with the method above which can provide images oi a specific polanrv - different to the polarity of light emerging from other parts of the screen
  • the term screen should be considered in its broadest form encompassing device capable of showing an image including video display units, projector screens windows, wallpanels watch faces and the like
  • image should be interpreted as meaning any type of image whethei a picture, written words and so forth
  • polarity refe to the light from the image being polarised 01 aligned in a particular direction 01 lange of directions
  • piov ided a piojector which projects images to a large remote screen say a wall or curtain This may be seen by multiple viewers - for example, in picture theatres, conference halls
  • the p ⁇ o]ecto ⁇ may have a light source from which light passes through a polansei, and then through a material that can affect polarity in a numbei of means This material shall now be referred to as a liquid crystal display although it may be possible that othei devices may be used to affect polarity
  • Manipulation of the liquid crystal display can cause specific images to have a specific polarity while twisting the polarity of the light fiom the piojector not associated with images in other ways
  • the images projected may all be of one polarity in combination with light of diffeient polarities
  • viewers who do not have any visual aids looking at the screen will not see any of the images which have a specific pola ⁇ tv This is because these are effectively obscured by the light receiv ed by the ⁇ ⁇ ew ei in differing polarities
  • selected viewers may have a visual aid in the form of polarised material to which they can view the screen. Because the material is polarised, most of the light from the screen is blocked out, except of those of the image having a specific polarity
  • the polarised material can come in a number of forms.
  • the polarised material may be in the form of a card which the viewer holds up, a fixed screen through which they look through, or the polarised material may merely be polarised sunglasses
  • One embodiment of the present invention there may be provided a number of VDU screens on a wall, each of which are emitting images of different polarisation
  • viewers having sunglasses of different polarities can view different images to each other
  • glasses to the viewers which have ad j ustable polarity so a viewer can actually select which of the images he/she wishes to view
  • liquid crystal display screens comprise of a back light, a back polariser which aligns the light in one direction, a LCD panel which can be manipulated to form various images in a certain polarity, and a front polariser allowing the viewer to actual view the images formed by the LCD panel.
  • the VDUs do not have a front pola ⁇ sei Instead, the selected viewers have a polarising material themselves with which to view the image on the screen Thus, a viewer without a polarising material will see white light (or whatever colour the back light is) whereas the selected viewers will see images as on a normal LCD screen
  • the screen will have the main components of a back light, back pola ⁇ sei and LCD screen
  • the present invention can be used to provide a theme of minimalism in offices Foi example, LCD's to unauthorised viewers may seem blank, thus pioviding a soothing atmosphere
  • the images may be selectively colouied Therefore viewers can be given special polarised glasses which contain a coloui tint Thus, those viewers without glasses would see nothing, those with red polarised glasses would see an image specific to them while those with gieen tinted glasses (and so forth) will see an image specific to them
  • the screen may be divided up into a grid like pattern with selected images in each area of the grid so the viewers know at which screen to direct then attention
  • One aspect of the present invention includes the provision of a window having a polarising material on one side of the window which allows people on one side to view images piojected onto that window whereas people on the othei side will not see these
  • this version of the present invention can be used as a window in a shop front People on one side can see through the window, eithei into the shop or outside fiom the shop Alternatively vieweis on the other side of the window may see a display on the window itself
  • These types of windows may be placed in buses, buildings, even houses and cars
  • such a window can be used as a visual alarm Often, audible alarms panic burglars and othei felons - which can be dangerous The present invention, the burglar/felon would only see thiough a window as normal, whereas others on the other side of the window may see an alarm message being displayed
  • the present invention may also be used as in the place of a one way mirror, foi example in controlled situations where monitoring reactions of viewers is required
  • the present invention has a number of applications
  • the present invention can be used in security applications, to remove distracting visual clutter, in advertising, to provide visual alarms and so forth
  • FIGS 1A and IB are schematics of one embodiment of the present invention.
  • FIGS 1A and IB show in highly schematic form one means by which the present invention can be implemented.
  • a screen generally indicated by arrow (1) m accordance with the present invention comprises in a single package a light source (2), a back polariser (3) and an LCD screen (4)
  • the light source (2) emits non-polarised light, that is light in all directions. Light in one direction passes through the polarising material (3) and then through the LCD screen (4).
  • the liquid crystals on the LCD screen (4) are manipulated to either allow the polarised light to pass through the screen, or to twist the polarised light in a different direction depending on the way the LCD screen in driven, the direct light or the untwisted light may form the image which is desired to view.
  • the screen ( 1 ) does not have a front polariser as is usual, the viewer (5) that does not have polarising glasses sees all of the light that comes through the LCD screen (4) - whether is polarised in one direction or the other. Thus, the viewer (5 ) sees effectively a blank screen.
  • the glasses (7) may in some instance be a screen or some other material through which the viewer can see the screen. The important thing is that not all viewers can discern the polarised image.

Abstract

Latent images on a screen (4) are polarisation encoded, so as to be visible only to a viewer (6) having suitable polarising means (7). The images may be projected via a liquid crystal display (4) having a rear polariser (3) and no front polariser. Images may further be colour encoded, with the polarising means (7) comprising suitably coloured tinted glasses. Alternatively, the images may be projected onto a window which has polarising material (7) on one side, such that they are visible from only one side of the window. Such a window can be used for advertising purposes, or to display an alarm signal which is not visible to an intruder or burglar.

Description

A METHOD OF SELECTIVE VIEWING
TECHNICAL FIELD
This invention relates to a method of selective viewing.
In particular, but not necessarily exclusively, the present invention relates to a method allowing only selected viewers to view an image on a display panel, screen or window.
BACKGROUND ART
There are many instances where it will be desired to have a means by which only selected people can view images and the like on screens or displays.
For example, often many workers in an office situation or a research and development role use computers that display confidential information. If there are visitors or unauthorised personnel in the region of the computer screens, it would be desirable to have means by which the images on the screen can be readily obscured from the view of the vistors but still visible to the workers.
Early developments of LCD screens provided a narrow viewing angle. However, recent technology has enabled the viewing angle of LCD screens to widen. This has added to security problems.
In another situation, it would be beneficial to have the ability to have selective viewing in a window display, say in retail areas. Currently, a compromise must be made as to whether to replace the window with a sign or keep a window and not realise the profits from advertising. It would be desirable if there could be provided a means by which people on one side of a "window" (say in a shop) can see through the window as per usual. Whereas, people on the other side of the "window'" (say in the street) would see a display. Not only would the above be useful for advertising purposes, but could also be useful in control room situations and where monitoring of reactions of viewers is required
In some situation4- it would be desired to have a single scieen whereby different viewers can see images specifically foi them other viewers can view different images, and some other viewers may see nothing at all. dependent upon the methods employed by each viewer
It would also be desnable if there could be provided some loim of visual alarm perhaps instead of 01 as a supplement to an audio alarm Foi example, theie may be a window or screen which indicates that someone is in trouble which cannot be seen b\ a burglar, but can be seen by those who can help This system may be used in homes, shops and taxi cabs as an example
It is an object of the present invention to address the above problems, 01 at least provide the public with the use of a choice
DISCLOSURE OF INVENTION
According to one aspect of the present invention there is piovided a method o1 providing selective viewing characterised by the steps of
(a) placing a selected image or images onto a screen, and
(b) ensuring that the selected image has a specific polarity, and
(c) causing light to emerge from the screen having a diffeient polaπtv oi polarities to the image
According to another aspect of the present invention there is provided a scieen foi use with the method above which can provide images oi a specific polanrv - different to the polarity of light emerging from other parts of the screen The term screen should be considered in its broadest form encompassing
Figure imgf000004_0001
device capable of showing an image including video display units, projector screens windows, wallpanels watch faces and the like
The term image should be interpreted as meaning any type of image whethei a picture, written words and so forth
The term polarity refeis to the light from the image being polarised 01 aligned in a particular direction 01 lange of directions
It can be seen that the present invention can be used in a variety of situations
For example in one embodiment of the present invention there may be piov ided a piojector which projects images to a large remote screen say a wall or curtain This may be seen by multiple viewers - for example, in picture theatres, conference halls
To achieve images on a large screen such as having selected polarity, the pιo]ectoι may have a light source from which light passes through a polansei, and then through a material that can affect polarity in a numbei of means This material shall now be referred to as a liquid crystal display although it may be possible that othei devices may be used to affect polarity
Manipulation of the liquid crystal display can cause specific images to have a specific polarity while twisting the polarity of the light fiom the piojector not associated with images in other ways
In this embodiment, the images projected may all be of one polarity in combination with light of diffeient polarities Thus, viewers who do not have any visual aids looking at the screen will not see any of the images which have a specific polaπtv This is because these are effectively obscured by the light receiv ed by the \ ιew ei in differing polarities However, selected viewers may have a visual aid in the form of polarised material to which they can view the screen. Because the material is polarised, most of the light from the screen is blocked out, except of those of the image having a specific polarity
The polarised material can come in a number of forms. For example, the polarised material may be in the form of a card which the viewer holds up, a fixed screen through which they look through, or the polarised material may merely be polarised sunglasses
One embodiment of the present invention there may be provided a number of VDU screens on a wall, each of which are emitting images of different polarisation Thus viewers having sunglasses of different polarities can view different images to each other Alternatively, there may be provided glasses to the viewers which have adjustable polarity so a viewer can actually select which of the images he/she wishes to view
According to a further aspect of the present invention there may be piovided viewing devices with adjustable polarity
If the screen is a video display unit (VDU), then in preferred embodiments of the present invention this is a liquid crystal display screen Typically, liquid crystal display (LCD) screens comprise of a back light, a back polariser which aligns the light in one direction, a LCD panel which can be manipulated to form various images in a certain polarity, and a front polariser allowing the viewer to actual view the images formed by the LCD panel.
In one embodiment of the present invention, the VDUs do not have a front polaπsei Instead, the selected viewers have a polarising material themselves with which to view the image on the screen Thus, a viewer without a polarising material will see white light (or whatever colour the back light is) whereas the selected viewers will see images as on a normal LCD screen
Thus the screen will have the main components of a back light, back polaπsei and LCD screen
The present invention can be used to provide a theme of minimalism in offices Foi example, LCD's to unauthorised viewers may seem blank, thus pioviding a soothing atmosphere
In a variation of the present invention, the images may be selectively colouied Therefore viewers can be given special polarised glasses which contain a coloui tint Thus, those viewers without glasses would see nothing, those with red polarised glasses would see an image specific to them while those with gieen tinted glasses (and so forth) will see an image specific to them
While these images may be mixed on one screen, in other embodiments, the screen may be divided up into a grid like pattern with selected images in each area of the grid so the viewers know at which screen to direct then attention
One aspect of the present invention includes the provision of a window having a polarising material on one side of the window which allows people on one side to view images piojected onto that window whereas people on the othei side will not see these For example, this version of the present invention can be used as a window in a shop front People on one side can see through the window, eithei into the shop or outside fiom the shop Alternatively vieweis on the other side of the window may see a display on the window itself These types of windows may be placed in buses, buildings, even houses and cars
Some embodiments of the present invention, such a window can be used as a visual alarm Often, audible alarms panic burglars and othei felons - which can be dangerous The present invention, the burglar/felon would only see thiough a window as normal, whereas others on the other side of the window may see an alarm message being displayed
The present invention may also be used as in the place of a one way mirror, foi example in controlled situations where monitoring reactions of viewers is required
The present invention has a number of applications The present invention can be used in security applications, to remove distracting visual clutter, in advertising, to provide visual alarms and so forth
Further aspects and advantages of the present invention will become apparent from the ensuing description which is given by way of example only
BRIEF DESCRIPTION OF DRAWINGS
Further aspects of the present invention will become apparent from the following description which is given by way of example only and with reference to the accompanying drawings in which:
Figures 1A and IB are schematics of one embodiment of the present invention
BEST MODES FOR CARRYING OUT THE INVENTION
Figures 1A and IB show in highly schematic form one means by which the present invention can be implemented.
A screen generally indicated by arrow (1) m accordance with the present invention comprises in a single package a light source (2), a back polariser (3) and an LCD screen (4)
For the purpose of illustration, these are shown in schematic exploded form It should be appreciated that in preferred embodiments of the piesent invention looks to the uninitiated to be a standard LCD screen The present invention may work as follows.
The light source (2) emits non-polarised light, that is light in all directions. Light in one direction passes through the polarising material (3) and then through the LCD screen (4).
The liquid crystals on the LCD screen (4) are manipulated to either allow the polarised light to pass through the screen, or to twist the polarised light in a different direction depending on the way the LCD screen in driven, the direct light or the untwisted light may form the image which is desired to view.
Because the screen ( 1 ) does not have a front polariser as is usual, the viewer (5) that does not have polarising glasses sees all of the light that comes through the LCD screen (4) - whether is polarised in one direction or the other. Thus, the viewer (5 ) sees effectively a blank screen.
In contrast, in figure IB a viewer (6) having polarised glasses (7) effectively blocks light of one polarisation to see an image on the LCD screen (4).
It should be appreciated that the glasses (7) may in some instance be a screen or some other material through which the viewer can see the screen. The important thing is that not all viewers can discern the polarised image.
Aspects of the present invention have been described by way of example only and it should be appreciated that modifications and additions may be made thereto without departing from the scope of the appended claims.

Claims

1 A method of providing selected viewing characterised by the steps of
a ) placing a selected image or images onto a screen, and
b) ensuring that the selected image has a specific polarity, and
c) causing light to emerge from the screen having a different polarity 01 polarities to the image
A method as claimed in claim 1 characterised by a further step of using a projector to proiect the images
3 A method as claimed in claim 2 wherein the projector has a light source from which light passes through a polariser and then the light passes through a material that can prevent polarity by a number of means
4 A method as claimed in claim 3 wherein there the material is a liquid crystal displav
5 A method as claimed in any claim 1 to 4 wherein the images can be viewed by having viewers looking through polarised material at the screen
6 A method as claimed in claim 5 wherein the polarised material contains a coloured tint so that the viewers can see images that are selectively colored
7 A method as claimed in any one of claims 1 to 6 wherein the screen is divided up into grid like pattern with selected images in each area of the grid
8 A method as claimed in any one of claims 1 to 7 wherein the scieen is in a form of a window
A method as claimed in any one claims of 1 to 7 wherein the screen is in a form of a one-way mirror
A method as claimed in any one claim of 1 to 7 wherein the screen is in the form of a video display unit
A screen for use with a method as described above which can provide images of specific polarity, w herein the polarity of the selected images is diffeient to that polarity of light emerging from other parts of the screen
A screen as claimed as in claim 1 1 which includes a polansei
A screen as claimed either claim 1 1 or claim 12 which includes a liquid crystal display
A screen as claimed in any one of claims 11 to 13 wherein the screen is a video display unit
A screen as claimed in any one of claims 1 1 to 14 wherein the screen is a liquid crystal display which does not have a front polansei
A screen as claimed in any one of claims of 1 1 to 15 wheiein the scieen is divided into grids
A screen as claimed in any one of claims 1 1 to 16 wheiein a screen is a window
A screen as claimed in any one of claims 1 1 to 17 when the scieen is a oneway mirror
A viewing device ha\ mg adjustable polarity
A visual alarm which includes a screen as claimed in anv of claims 1 to 19
21 A viewing device for viewing a screen according to any claims in claim 1 1 to 18 wherein the viewing device has coloured tinted glasses.
22. A visual alarm operating according to the method as claimed in any one of claims 1 to 10.
23. A method substantially as herein described with reference to and as illustrated by the accompanying drawings.
24. A screen substantially as herein described with reference to and as illustrated by the accompanying drawings.
25 A viewing device substantially as herein described with reference to and as illustrated by the accompanying drawings.
26. A visual alarm substantially as herein described with reference to and as illustrated by the accompanying drawings.
PCT/NZ2000/000220 1999-11-25 2000-11-06 A method of selective viewing WO2001038926A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
NZ501334 1999-11-25
NZ50133499 1999-11-25

Publications (1)

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Cited By (6)

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GB2414332A (en) * 2004-05-18 2005-11-23 Hao He Hidden text device.
US7347556B2 (en) 2005-06-07 2008-03-25 The Boeing Company Systems and methods for generating stereo images
US9547112B2 (en) 2013-02-06 2017-01-17 Steelcase Inc. Polarized enhanced confidentiality
CN108583438A (en) * 2018-07-10 2018-09-28 深圳市歌美迪电子技术发展有限公司 Hidden display device and rear-view mirror system
US11106124B2 (en) 2018-02-27 2021-08-31 Steelcase Inc. Multiple-polarization cloaking for projected and writing surface view screens
US11221497B2 (en) 2017-06-05 2022-01-11 Steelcase Inc. Multiple-polarization cloaking

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2414332A (en) * 2004-05-18 2005-11-23 Hao He Hidden text device.
US7347556B2 (en) 2005-06-07 2008-03-25 The Boeing Company Systems and methods for generating stereo images
US9547112B2 (en) 2013-02-06 2017-01-17 Steelcase Inc. Polarized enhanced confidentiality
US9885876B2 (en) 2013-02-06 2018-02-06 Steelcase, Inc. Polarized enhanced confidentiality
US10061138B2 (en) 2013-02-06 2018-08-28 Steelcase Inc. Polarized enhanced confidentiality
US11221497B2 (en) 2017-06-05 2022-01-11 Steelcase Inc. Multiple-polarization cloaking
US11106124B2 (en) 2018-02-27 2021-08-31 Steelcase Inc. Multiple-polarization cloaking for projected and writing surface view screens
US11500280B2 (en) 2018-02-27 2022-11-15 Steelcase Inc. Multiple-polarization cloaking for projected and writing surface view screens
CN108583438A (en) * 2018-07-10 2018-09-28 深圳市歌美迪电子技术发展有限公司 Hidden display device and rear-view mirror system

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