WO2004036286A1 - Multi-view display - Google Patents

Multi-view display Download PDF

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Publication number
WO2004036286A1
WO2004036286A1 PCT/NZ2003/000215 NZ0300215W WO2004036286A1 WO 2004036286 A1 WO2004036286 A1 WO 2004036286A1 NZ 0300215 W NZ0300215 W NZ 0300215W WO 2004036286 A1 WO2004036286 A1 WO 2004036286A1
Authority
WO
WIPO (PCT)
Prior art keywords
display
viewing angle
images
layer
multi view
Prior art date
Application number
PCT/NZ2003/000215
Other languages
French (fr)
Inventor
Gabriel Damon Engel
Original Assignee
Puredepth Limited
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 Puredepth Limited filed Critical Puredepth Limited
Priority to CN03825249XA priority Critical patent/CN1726418B/en
Priority to US10/528,334 priority patent/US8146277B2/en
Priority to JP2004545092A priority patent/JP2006504122A/en
Priority to EP03808917A priority patent/EP1546789A4/en
Priority to AU2003265026A priority patent/AU2003265026B2/en
Publication of WO2004036286A1 publication Critical patent/WO2004036286A1/en
Priority to US12/948,638 priority patent/US20110285609A1/en

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Classifications

    • 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
    • G09F19/14—Advertising or display means not otherwise provided for using special optical effects displaying different signs depending upon the view-point of the observer
    • 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
    • G02B27/02—Viewing or reading apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Arrangement of adaptations of instruments
    • B60K35/654—
    • B60K35/656—
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1323—Arrangements for providing a switchable viewing angle
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals

Definitions

  • This invention related to the field of electronic information display.
  • In-car navigation systems and in-car entertainment systems are available as an accessory in new cars, or are available separately for retrofit, commonly called after market sales.
  • the displays for the systems are placed in or on top of the car dash board. Since the displays are typically of the wide- viewing angle colour liquid crystal type, both the front passenger and the driver may see the display.
  • the display may be supplied with information so that it forms part of the car's navigation system or part of the entertainment system at any one time. If an in-car entertainment system is fitted in view of the driver, the video component such as television and DND must be disabled whilst the car is in motion, so not to distract the driver who is responsible for the safety of the vehicle.
  • Privacy film or filters are common in the market place which reduce the viewing angle in which the viewer can only see the displayed images within a certain angle - typically directly in front of the display.
  • a simple solution for a privacy screen is to laminate a view control film onto a screen. 3M are well known for producing these products which control the position from where the display can be viewed.
  • the two most common types of privacy film are light control film and blur film.
  • Light control film acts like Venetian blinds. If the observer were to stand at 60' to the front of these blinds the view would be blocked by the sides of the 'louvers'. However when the observer stands directly in front of the 'blinds' the display is viewable.
  • Holographic diffusion film works by dispersing the incident light at particular angles and transmitting it at all other angles. The display appearance changes from translucent to transparent depending on the viewing angle.
  • a prismatic film or 'image directing film' can be used to direct the image displayed on a display device.
  • the film rakes the image created by a flat panel display and redirects it to the optimum viewing angle, generally through refraction.
  • Parallax barrier methods and lenticular lenses can also be used to direct light.
  • Viewing angle can also be controlled by the liquid crystal itself. Viewing angle, which is in the same direction as the maximum contrast, can be controlled by the liquid crystal cell structure itself.
  • the contrast ratio is defined as the ratio of maximum luminance to the minimum luminance. Since the retardation experienced by the ray traversing at the midlayer tilt angle is the lowest in this direction in a normally black panel, the luminance in this direction is lower resulting in a lower contrast ratio. Both the azimuth and tilt of this angle can be controlled by changing the azimuth and tilt angle on the alignment layers respectively. See Liquid Crystal Displays by Ernst Lueder, Wily / SID series in display technology incorporated herein by way of reference.
  • imaging planes are stacked with set distances between them. These imaging planes may also be stacked as closely as possible.
  • these displays consist of a high- brightened backlight, and multiple image planes including but limited to a background image panel and a front image plane, which are parallel and physically separate and generally are laminated to form a stack.
  • image planes including but limited to a background image panel and a front image plane, which are parallel and physically separate and generally are laminated to form a stack.
  • the following discussion applies to all image planes that are addressed by passive or active matrices or have filters arranged in any periodic pattern but not limited to those described above.
  • the viewing angle of liquid crystal displays can be controlled by the orientation of the liquid crystal molecules with respect to the glass substrates that form the display.
  • Optimum viewing angle means the direction a viewers looks in where the display contrast, the ratio between the luminance of the light and dark states of the display, is at a maximum.
  • Orientation is defined as a three-tuple where each element gives the magnitude of the angle between the x, y and z axes respectively where the x, y and z axes are aligned parallel with the horizontal, vertical and normal directions of the display respectively.
  • a multi view display for viewing different images at specified viewing angles
  • a multi view display comprising:
  • an un-braiding viewing angle manipulation means which manipulates the viewing angle of the images displayed on said display layer
  • each constituent image of the interlaced image is presented at the viewing angle or viewing angles as determined by the un-braiding viewing angle manipulation means.
  • two images will be presented to the viewer or viewers at different viewing angles using the present invention.
  • Those images are interlaced and displayed on the display layer.
  • the images are interlaced in such a way that the un-braiding viewing angle manipulation means separates out or 'unbraids' the constituent images in said interlaced image and presents said constituent images at different viewing angles.
  • the observer will see one of the constituent images from one viewing angle and other constituent images from other viewing angles. While this specification refers to the presentation of two images this should not be seen as limiting. Those skilled in the art will appreciate that greater numbers of images can be interlaced and subsequently displayed to various viewing angles.
  • viewing angle manipulation means should be interpreted to mean any device used to direct light in certain directions or prevent light from proceeding in certain directions, this includes wide angle diffusers, privacy film, image or optical directing film.
  • un-braiding viewing angle manipulation means is preferably an adapted viewing angle manipulation means such as a privacy film, image directing film or compensation film.
  • this will involve interlacing at least two viewing angle manipulation means which direct light at different angles.
  • the film will be capable (when applied to an interlaced image, which is interlaced consistently with the interlaced image directing films) of directing images to two different viewing angles.
  • viewing angle as used here in should be interpreted as relating to the angle at which images displayed on a display device or pixel are viewable some a wide viewing angles may close to 100% or 180 degrees. Typically narrower viewing angles will be used to narrow the angles from which images can be viewed.
  • the unbraiding viewing angle manipulation means has the ability to present images displayed on the display device to different viewing angles.
  • the interlacing of images and their display needs to be consistent with the un-braiding viewing angle manipulation means used.
  • two optical viewing films with different viewing angles to each other will be used with corresponding interlacing between the unbraiding viewing angle manipulation means and the interlaced image displayed.
  • each of the at least two interlaced images are presented to a different viewing angles than the other image(s).
  • a multi view display for viewing different images at specified viewing angles
  • a multi view display comprising
  • an adapted display layer for the display of images wherein said adapted display layer comprises, at least two different specified viewing angle pixels which are interlaced,
  • each constituent image of the interlaced image is presented to the viewing angle or viewing angles as determined by the viewing angle of the interlaced specified viewing angle pixels.
  • the term 'specified viewing angle pixel' as used herein should be interpreted to include a pixel which is produced to have a defined viewing angle; that is the contrast ratio of the pixel is optimal for a certain scope of viewing angle.
  • the control of viewing angle of a pixel is found commonly in the market. For example displays which are intended to be located higher than the intended viewer have a viewing angle pointing down.
  • Different specified viewing angle pixels which have different viewing angles are interlaced within the adapted display layer.
  • Preferably two images will be presented to the viewer or viewers. Those images are interlaced and displayed on the adapted display layer.
  • the images are interlaced in such a way that the specified viewing angle pixels separate out or 'unbraids' the constituent images the interlaced image displayed on the adapted display layer and presents the constituent images at different viewing angles. Using this technique, the observer will see one of the constituent images from one viewing angle and the other constituent image from another viewing angle.
  • a multi view display for viewing different images at specified viewing angles
  • a multi view display comprising:
  • an adapted display layer for the display of images wherein said adapted display layer comprises:
  • each constituent image of the interlaced image is presented to the viewing angle or viewing angles as determined by the viewing angle of the interlaced specified viewing angle pixels in combination with the unbraiding viewing angle manipulation means.
  • a manipulation means preferably an interlaced privacy film or light directing means is used in combination with interlaced specified viewing angle pixels.
  • the combination of these mechanisms allows greater control of the viewing angle to which images are presented.
  • a multi-layer multi view display for displaying different images at specified viewing angles comprising:
  • each constituent image of the interlaced image displayed on said layer(s) (which the un-braiding viewing angle manipulation means is acting upon) is presented at the viewing angle or viewing angles as determined by the un-braiding viewing angle manipulation means.
  • the display device is made up of a two layered multi-layer display, being backlit, with each layer being selectively transparent.
  • an interlaced lens with a triangle strip pattern with particular viewing angles acting as a viewing angle manipulation means acts on the rear most layer.
  • the interlaced lens allows the constituent images of an interlaced image displayed on the rear screen to be seen from the viewing angles specified by the interlaced lens.
  • the display is required to be transparent.
  • the multi-layered multi view display is used in a car - if the driver was looking at the rear image layer with a viewing direction of about 60 degrees in the plane perpendicular to the floor and parallel with the horizontal and with the front image layer with an optimal viewing direction of -60 degrees in said plane then the driver will be able to see the image on the rear image layer and not on the from image layer.
  • the passenger sitting to the other side of the display, can see only information from the front image layer.
  • the passenger can view entertainment only and the drive can view navigation only.
  • limited viewing angle which was previously considered as a disadvantage in the industry, combined with multiple layered displays can be used to multiplex images to multiple viewers which is an unexpected advantage.
  • a multi-layer multi view display for displaying different images at specified viewing angles comprising:
  • At least two display layers for the display of images said display layers being substantially planar and at least in part overlapping, wherein display layer(s) overlapping another display layer are selectively transparent;
  • At least one of the display layers is an adapted display layer comprising pixels which are specified viewing angle pixels;
  • the images displayed on the at least one adapted display layer have a different viewing angle to the images displayed on the other (non-adapted) display layer(s).
  • the display device is made up of a two layered multi-layer display, being backlit, with each layer being selectively transparent.
  • Both display layers are adapted display layers, having specified viewing angle pixels where the viewing angle of each of the two layers is opposite such that a viewer from the left will see the image displayed one layer and a observer from the right will see the image displayed on the other layer.
  • At least two display layers for the display of images said display layers being substantially planar and at least in part overlapping, wherein display layer(s) that are overlapping another display layer are selectively transparent, ii) a viewing angle manipulation means with a wide viewing angle acting upon at least one display and being located behind at least one display,
  • two display layers are overlapped and transparent and are backlit.
  • the front layer has a narrow viewing angle to the left (from the viewer's perspective) behind this is a further narrow viewing angle display but acting upon it is a wide angle diffusion refractor.
  • the images displayed on the rear layer are viewable from a wide viewing angle and the images displayed on the front layer are viewed only from the left (and are viewed as being layered on top of images displayed on the back layer).
  • the diffusing refractor will assist in overcoming the moire interference arising as a result of layering two like substrates.
  • At least one of the display layers is an adapted display layer comprising of at least two different specified viewing angle pixels which are interlaced, and all layers to the rear of that adapted display layer (if any) are adapted display layers
  • each constituent image of the interlaced image is presented to the viewing angle as determined by the viewing angle of the interlaced specified viewing angle pixels in combination with the unbraiding viewing angle manipulation means.
  • a further aspect of the present invention comprises a method of operating a multi view display said multi view display having at least two viewing angles characterised by the steps of displaying each images intended for each viewing to the display layer which presents that image to the intended viewing angle.
  • a further aspect of the present invention comprises display software adapted to facilitate the display of images using a multi view display said multi view display comprising at least two multi layered display layers, said display software being adapted to execute the steps of:
  • Figure 1 Is a diagrammatic view of a combined in-car navigation and entertainment display.
  • a viewer (1) looking at the display (5) in the direction shown sees a movie being played (3), whilst a viewer (2) looking at the display in the direction shown sees the navigation system (4).
  • Figure 2 Shows a diagrammatic view of the multi-layered embodiment where an image (3) is displayed on the first layer (5) with an optimum viewing direction (6) and an image (4) is displayed on the second layer (7) with an optimum viewing direction (8).
  • Figure 3 Is a diagrammatic view of a multi-layer multi view embodiment of the present invention in which the front layer is viewable only by one observer and the rear layer is viewable by both observers.
  • Figure 4 Is a diagrammatic view of a multi-layer multi view embodiment of the present invention in which the front display layer is viewable by both observers and two interlaced images displayed on the rear display layer are presented to different observers.
  • a single layer display is used to at least two different images or display contents each image/display-content being presented to a different viewing angle to the images/display-content.
  • Figure one illustrates single layer multi view display used as an in-car navigation/entertainment device.
  • a viewer (1) looking at the display (5) in the direction shown sees a movie being played (3), whilst a second viewer (2) looking at the display in the direction shown sees the image of a navigation system (4).
  • the display layer (5) is adapted such that it comprises interlaced pixels of two different viewing angles. The movie is displayed on pixels of one viewing angle and the navigation images are displayed on pixels of the other viewing angle.
  • a multi-layered multi view device is used to display at least two different images or display contents each image/display-content being presented to a different viewing angle to the images/display-content.
  • Figure two illustrates a combined in-car navigation and entertainment display.
  • a first layer with optimum viewing direction (6) is placed substantially collinear and as close to a second layer with an optimum viewing direction (8).
  • a diffusion layer (9) to abate moire interference.
  • the displays can be back lit using either direct view lamps or a light pipe (10).
  • a viewer viewing at an angle (6) will see image (3), and a viewer looking in direction (8) will see image (4).
  • a multi-layered multi view device is used to display layered images to one viewer and a single image to another viewer.
  • Figure illustrates a multi layered multi view device.
  • An image (15) is displayed on the first layer (13) with an optimum viewing direction (30) and an image (14) is displayed on a second layer (11) through a viewing angle enhancer (12) which expands the viewing angle (31) of second layer (11) with an optimum viewing angle of (31), such that a viewer (17) inline with the viewing angle of the first layer (30) would see a combined image (19) with the image (14) from the second layer (11) would appear at distance behind the image (15) from the first layer (13) and such that a second simultaneous viewer (16) outside the viewing angle (30) of the fist layer would see an image (18) only represented by the second layer (11).
  • Figure 4 illustrates a diagrammatic view of the multi-layered privacy embodiment where image (25) is displayed on the first layer (22) and multiple images (23, 24) are displayed on the back layer (20) such that the images are interlaced to match a lens stripe pattern (21) allowing a viewer (29) in position inline with pattern (32) matching the image (23) on the rear layer (20) would see a composite image (29) compromising the foreground image (25) in front of a background image (23) that is aligned with the viewers (27) position, while allowing a second simultaneous viewer in position inline with a pattern (33) matching the image (24) on the rear layer (20) would see a composite image (28) compromising the foreground image (25) in front of a background image (24) that is aligned with the viewer's position.

Abstract

A multi view display (5) provides different viewing angles for different images (3, 4). The display (5) may comprise a single screen on which two or more images (3, 4) are interleaved, or a number of overlapping screens on which respective images (3, 4) are displayed. Viewing manipulation means such as privacy films or lenticular arrays control the viewing angles for each image (3, 4). The multiview display (5) may be used in a vehicle, to simultaneously display a movie (3) to a passenger (1), and a navigation image (3) to a driver (2).

Description

MULTI-VIEW DISPLAY
TECHNICAL FIELD
This invention related to the field of electronic information display.
BACKGROUND ART
In-car navigation systems and in-car entertainment systems are available as an accessory in new cars, or are available separately for retrofit, commonly called after market sales. The displays for the systems are placed in or on top of the car dash board. Since the displays are typically of the wide- viewing angle colour liquid crystal type, both the front passenger and the driver may see the display. The display may be supplied with information so that it forms part of the car's navigation system or part of the entertainment system at any one time. If an in-car entertainment system is fitted in view of the driver, the video component such as television and DND must be disabled whilst the car is in motion, so not to distract the driver who is responsible for the safety of the vehicle. This is federally mandated safety requirement in many countries and is somewhat of a disadvantage as it is desirable for the front passenger, and only the front passenger, to view in-car entertainment. . In practice many owners disable this safety feature resulting in potentially fatal distraction for the driver. However, it is also useful for the driver view the in-car navigation system whilst the vehicle is moving. With present systems this would interrupt the passenger's entertainment. A potential solution would be to supply separate displays to the passenger and driver, however this is increases expense and takes up almost double the area restricting design flexibility of the dash board control canter and reducing the space available for peripheral devices and storage space.
Long aeroplane flights are particularly boring for passengers. Airlines have attempted to alleviate this boredom by including projector systems on the aeroplanes to supply information about the journey and entertainment. However with a single projector system the entertainment is the same for each passenger, and there is no accounting for individual taste or interest. This problem has been alleviated in some aeroplanes with separate displays for each passenger, however a display for each passenger generally increases expense requires individual displays to be quite small, and can add significant weight to the plane increasing costs for airlines.
It is the object of the present invention specifically to allow a passenger to view full entertainment features such as television and movies on the same display device that a driver can view navigation information without conflict between images and thus to reduce components, reduce complexity, reduce driver distraction, and increase passenger enjoyment. To do this one requires to control the viewing angle of a display. There exist various methods to do this.
Certain environments such as kiosks or ATM's require privacy. Privacy film or filters are common in the market place which reduce the viewing angle in which the viewer can only see the displayed images within a certain angle - typically directly in front of the display. A simple solution for a privacy screen is to laminate a view control film onto a screen. 3M are well known for producing these products which control the position from where the display can be viewed. The two most common types of privacy film are light control film and blur film. Light control film acts like Venetian blinds. If the observer were to stand at 60' to the front of these blinds the view would be blocked by the sides of the 'louvers'. However when the observer stands directly in front of the 'blinds' the display is viewable. Holographic diffusion film works by dispersing the incident light at particular angles and transmitting it at all other angles. The display appearance changes from translucent to transparent depending on the viewing angle.
A prismatic film or 'image directing film' can be used to direct the image displayed on a display device. The film rakes the image created by a flat panel display and redirects it to the optimum viewing angle, generally through refraction.
Parallax barrier methods and lenticular lenses can also be used to direct light.
Viewing angle can also be controlled by the liquid crystal itself. Viewing angle, which is in the same direction as the maximum contrast, can be controlled by the liquid crystal cell structure itself. The contrast ratio is defined as the ratio of maximum luminance to the minimum luminance. Since the retardation experienced by the ray traversing at the midlayer tilt angle is the lowest in this direction in a normally black panel, the luminance in this direction is lower resulting in a lower contrast ratio. Both the azimuth and tilt of this angle can be controlled by changing the azimuth and tilt angle on the alignment layers respectively. See Liquid Crystal Displays by Ernst Lueder, Wily / SID series in display technology incorporated herein by way of reference.
At present there exist methods to produce displays where several imaging planes are stacked with set distances between them. These imaging planes may also be stacked as closely as possible. In a preferred embodiment these displays consist of a high- brightened backlight, and multiple image planes including but limited to a background image panel and a front image plane, which are parallel and physically separate and generally are laminated to form a stack. There are generally colour filter stripes, and a matrix on each display which defined the borders of the pixels and a method of eliminated moire interference. The following discussion applies to all image planes that are addressed by passive or active matrices or have filters arranged in any periodic pattern but not limited to those described above.
The viewing angle of liquid crystal displays can be controlled by the orientation of the liquid crystal molecules with respect to the glass substrates that form the display. Optimum viewing angle here means the direction a viewers looks in where the display contrast, the ratio between the luminance of the light and dark states of the display, is at a maximum. Orientation here is defined as a three-tuple where each element gives the magnitude of the angle between the x, y and z axes respectively where the x, y and z axes are aligned parallel with the horizontal, vertical and normal directions of the display respectively.
It has previously been considered undesirable for displays to have a narrow viewing angle because this prohibits multiple users from viewing the same image. However in the case of a car navigation and entertainment system it would be desirable for the driver to be able to see navigation information, and only navigation information and the passenger to see entertainment, and only entertainment. For safety, space and cost constraints it would be useful for both passengers to have different images views from the same display. All references, including any patents or patent applications cited in this specification are hereby incorporated by reference. No admission is made that any reference constitutes prior art. The discussion of the references states what their authors assert, and the applicants reserve the right to challenge the accuracy and pertinence of the cited documents. It will be clearly understood that, although a number of prior art publications are referred to herein, this reference does not constitute an admission that any of these documents form part of the common general knowledge in the art, in New Zealand or in any other country.
It is acknowledged that the term 'comprise' may, under varying jurisdictions, be attributed with either an exclusive or an inclusive meaning. For the purpose of this specification, and unless otherwise noted, the term 'comprise' shall have an inclusive meaning - i.e. that it will be taken to mean an inclusion of not only the listed components it directly references, but also other non-specified components or elements. This rationale will also be used when the term 'comprised' or 'comprising' is used in relation to one or more steps in a method or process.
It is an object of the present invention to address the foregoing problems or at least to provide the public with a useful choice.
Further aspects and advantages of the present invention will become apparent from the ensuing description which is given by way of example only.
DISCLOSURE OF INVENTION
Accordingly in a first aspect of the present invention may broadly be said to consist in a multi view display for viewing different images at specified viewing angles comprising a multi view display comprising:
i) a display layer for the display of images;
ii) an un-braiding viewing angle manipulation means which manipulates the viewing angle of the images displayed on said display layer;
such that when at least two images are be interlaced and displayed on said display layer, each constituent image of the interlaced image is presented at the viewing angle or viewing angles as determined by the un-braiding viewing angle manipulation means.
Preferably two images will be presented to the viewer or viewers at different viewing angles using the present invention. Those images are interlaced and displayed on the display layer. The images are interlaced in such a way that the un-braiding viewing angle manipulation means separates out or 'unbraids' the constituent images in said interlaced image and presents said constituent images at different viewing angles. Using this technique, the observer will see one of the constituent images from one viewing angle and other constituent images from other viewing angles. While this specification refers to the presentation of two images this should not be seen as limiting. Those skilled in the art will appreciate that greater numbers of images can be interlaced and subsequently displayed to various viewing angles.
The term viewing angle manipulation means should be interpreted to mean any device used to direct light in certain directions or prevent light from proceeding in certain directions, this includes wide angle diffusers, privacy film, image or optical directing film.
The term un-braiding viewing angle manipulation means is preferably an adapted viewing angle manipulation means such as a privacy film, image directing film or compensation film. Typically this will involve interlacing at least two viewing angle manipulation means which direct light at different angles. For example by interlacing two image directing films of which have different refraction angles to each other, the film will be capable (when applied to an interlaced image, which is interlaced consistently with the interlaced image directing films) of directing images to two different viewing angles.
The term viewing angle as used here in should be interpreted as relating to the angle at which images displayed on a display device or pixel are viewable some a wide viewing angles may close to 100% or 180 degrees. Typically narrower viewing angles will be used to narrow the angles from which images can be viewed.
Throughout this specification reference is made to privacy film or image directing film or other viewing angle manipulation means. However this should not be seen as limiting. Those skilled in the art will appreciate that any means of directing images to viewing angles can be used with the present invention.
In the present invention, the unbraiding viewing angle manipulation means has the ability to present images displayed on the display device to different viewing angles.
This can be achieved by interlacing two different image directing films each of which is designed to present images to a viewing angles angle which is different to the other interlaced privacy film.
The interlacing of images and their display needs to be consistent with the un-braiding viewing angle manipulation means used. In the case of two images which are interlaced, two optical viewing films with different viewing angles to each other will be used with corresponding interlacing between the unbraiding viewing angle manipulation means and the interlaced image displayed.
Preferably each of the at least two interlaced images are presented to a different viewing angles than the other image(s).
Accordingly in a further aspect of the present invention may broadly be said to consist in a multi view display for viewing different images at specified viewing angles comprising a multi view display comprising,
an adapted display layer for the display of images wherein said adapted display layer comprises, at least two different specified viewing angle pixels which are interlaced,
such that when at least two images are interlaced and displayed on said adapted display layer, each constituent image of the interlaced image is presented to the viewing angle or viewing angles as determined by the viewing angle of the interlaced specified viewing angle pixels.
The term 'specified viewing angle pixel' as used herein should be interpreted to include a pixel which is produced to have a defined viewing angle; that is the contrast ratio of the pixel is optimal for a certain scope of viewing angle. The control of viewing angle of a pixel is found commonly in the market. For example displays which are intended to be located higher than the intended viewer have a viewing angle pointing down.
Different specified viewing angle pixels which have different viewing angles are interlaced within the adapted display layer. Preferably two images will be presented to the viewer or viewers. Those images are interlaced and displayed on the adapted display layer. The images are interlaced in such a way that the specified viewing angle pixels separate out or 'unbraids' the constituent images the interlaced image displayed on the adapted display layer and presents the constituent images at different viewing angles. Using this technique, the observer will see one of the constituent images from one viewing angle and the other constituent image from another viewing angle.
Accordingly in a further aspect of the present invention may broadly be said to consist in a multi view display for viewing different images at specified viewing angles comprising a multi view display comprising:
i) an adapted display layer for the display of images wherein said adapted display layer comprises:
ii) at least two different specified viewing angle pixels which are interlaced
iii) an un-braiding viewing angle manipulation means;
such that when at least two images are interlaced and displayed on said adapted display layer, each constituent image of the interlaced image is presented to the viewing angle or viewing angles as determined by the viewing angle of the interlaced specified viewing angle pixels in combination with the unbraiding viewing angle manipulation means.
In this embodiment the combination of a manipulation means preferably an interlaced privacy film or light directing means is used in combination with interlaced specified viewing angle pixels. The combination of these mechanisms allows greater control of the viewing angle to which images are presented.
Accordingly in a further aspect of the present invention may be broadly said to consist in a multi-layer multi view display for displaying different images at specified viewing angles comprising:
i) at least two display layers for the display of images, said display layers being substantially planar and at least in part overlapping, wherein display layer(s) overlapping another display layer are selectively transparent; ii) an un-braiding viewing angle manipulation means acting upon at least one of the display layers and thereby manipulating the viewing angle of images displayed on the display layer(s) behind it;
such that when at least two images are be interlaced and a display layer which the un-braiding viewing angle manipulation means is acting upon, each constituent image of the interlaced image displayed on said layer(s) (which the un-braiding viewing angle manipulation means is acting upon) is presented at the viewing angle or viewing angles as determined by the un-braiding viewing angle manipulation means.
In one preferred embodiment of the present invention the display device is made up of a two layered multi-layer display, being backlit, with each layer being selectively transparent. In between those layers an interlaced lens with a triangle strip pattern with particular viewing angles acting as a viewing angle manipulation means acts on the rear most layer. The interlaced lens allows the constituent images of an interlaced image displayed on the rear screen to be seen from the viewing angles specified by the interlaced lens.
A conventional non-layered, non-compensated colour liquid crystal display, contrast ratio decreases until to a crossover point at which the image inverts when viewed from outside the optimal viewing angle. This results in images being "washed out" and beyond the cut-off point these colours invert completely with black changing to white.
In the multi-layered setup used in a multi view display as described here-in the display is required to be transparent. Hence in a real life scenario - the multi-layered multi view display is used in a car - if the driver was looking at the rear image layer with a viewing direction of about 60 degrees in the plane perpendicular to the floor and parallel with the horizontal and with the front image layer with an optimal viewing direction of -60 degrees in said plane then the driver will be able to see the image on the rear image layer and not on the from image layer. Conversely, the passenger, sitting to the other side of the display, can see only information from the front image layer. Hence the passenger can view entertainment only and the drive can view navigation only. Thus limited viewing angle, which was previously considered as a disadvantage in the industry, combined with multiple layered displays can be used to multiplex images to multiple viewers which is an unexpected advantage.
Accordingly in a further aspect of the present invention may be broadly said to consist in a multi-layer multi view display for displaying different images at specified viewing angles comprising:
at least two display layers for the display of images, said display layers being substantially planar and at least in part overlapping, wherein display layer(s) overlapping another display layer are selectively transparent;
where in at least one of the display layers is an adapted display layer comprising pixels which are specified viewing angle pixels;
such that images displayed on the at least one adapted display layer will be presented to the viewing angle of the specified viewing angle pixels.
Preferably the images displayed on the at least one adapted display layer have a different viewing angle to the images displayed on the other (non-adapted) display layer(s).
In a preferred embodiment of the present invention the display device is made up of a two layered multi-layer display, being backlit, with each layer being selectively transparent. Both display layers are adapted display layers, having specified viewing angle pixels where the viewing angle of each of the two layers is opposite such that a viewer from the left will see the image displayed one layer and a observer from the right will see the image displayed on the other layer.
Accordingly in a further aspect of the present invention may be broadly said to consist in a multi-layer multi view display for displaying different images at specified viewing angles comprising:
i) at least two display layers for the display of images, said display layers being substantially planar and at least in part overlapping, wherein display layer(s) that are overlapping another display layer are selectively transparent, ii) a viewing angle manipulation means with a wide viewing angle acting upon at least one display and being located behind at least one display,
such that images displayed upon display layers that the viewing angle manipulation means is acting on are presented to the viewing angle determined by the viewing angle manipulation means.
In a preferred embodiment two display layers are overlapped and transparent and are backlit. The front layer has a narrow viewing angle to the left (from the viewer's perspective) behind this is a further narrow viewing angle display but acting upon it is a wide angle diffusion refractor. Hence the images displayed on the rear layer are viewable from a wide viewing angle and the images displayed on the front layer are viewed only from the left (and are viewed as being layered on top of images displayed on the back layer). The diffusing refractor will assist in overcoming the moire interference arising as a result of layering two like substrates.
Accordingly in a further aspect of the present invention may be broadly said to consist in a multi-layer multi view display for displaying different images at specified viewing angles comprising:
at least two display layers for the display of images, said display layers being substantially planar and at least in part overlapping, wherein display layer(s) that are overlapping another display layer are selectively transparent,
wherein at least one of the display layers is an adapted display layer comprising of at least two different specified viewing angle pixels which are interlaced, and all layers to the rear of that adapted display layer (if any) are adapted display layers
and also comprising at least one an un-braiding viewing angle manipulation means acting upon the adapted the display layer(s) behind it,
such that when at least two images are interlaced and displayed on said adapted display layer, each constituent image of the interlaced image is presented to the viewing angle as determined by the viewing angle of the interlaced specified viewing angle pixels in combination with the unbraiding viewing angle manipulation means.
Preferably the multi view display is adapted to receive images from a CPU or other image transferring device such as a DVD or video playback.
Accordingly a further aspect of the present invention comprises a method of operating a multi view display said multi view display having at least two viewing angles characterised by the steps of displaying each images intended for each viewing to the display layer which presents that image to the intended viewing angle.
Accordingly a further aspect of the present invention comprises display software adapted to facilitate the display of images using multi view display said multi view display having at least two viewing angles said display software being adapted to execute the steps of transmitting each images intended for each viewing to the display layer which presents that image to the intended viewing angle:
Accordingly a further aspect of the present invention comprises a method of operating a multi view display said multi view display comprising at least two multi layered display layers characterised by the steps of:
i) displaying interlaced images on display layers on which an un-braiding viewing angle manipulation means acts
ii) displaying non-interlaced images on any display layers (if any) on which no un-braiding viewing angle manipulation means acts.
Accordingly a further aspect of the present invention comprises display software adapted to facilitate the display of images using a multi view display said multi view display comprising at least two multi layered display layers, said display software being adapted to execute the steps of:
i) transmitting interlaced images to display layer(s), said display layer(s) having an un-braiding viewing angle manipulation means acting upon it (them), said interlaced image being acted upon by said un-braiding viewing angle manipulation means to present the constituent images of the interlaced image to differing viewing angles, and ii) transmitting (non-interlaced) image data to display layers (if any) on which no unbraiding viewing angle manipulation means acts said image data being used by said display components to display a images to the viewing angle inherent to said display layer.
The display layer used in the invention specified in this can be any kind of display device capable of meeting the needs of the embodiment - such as interlacing of pixels or transparency in the case of a multi layered embodiment such display device can be an Liquid Crystal Display (LCD), an Organic Light Emitting Diode Display (OLED) or any other type of display.
Reference throughout this specification is made the present invention as applying to video display systems. However, it should be appreciated by those skilled in the art that other types of display and imaging systems may be used in conjunction with the invention, not necessarily being video screens such as but not limited to hand held or arcade video games, desktop computers, security monitors, process control system monitors.
BRIEF DESCRIPTION OF DRAWINGS
Further aspects of the present invention will become apparent from the following deposition which is given by way of example only and with reference to the accompanying drawings in which:
Figure 1: Is a diagrammatic view of a combined in-car navigation and entertainment display. A viewer (1) looking at the display (5) in the direction shown sees a movie being played (3), whilst a viewer (2) looking at the display in the direction shown sees the navigation system (4).
Figure 2: Shows a diagrammatic view of the multi-layered embodiment where an image (3) is displayed on the first layer (5) with an optimum viewing direction (6) and an image (4) is displayed on the second layer (7) with an optimum viewing direction (8). Figure 3 : Is a diagrammatic view of a multi-layer multi view embodiment of the present invention in which the front layer is viewable only by one observer and the rear layer is viewable by both observers.
Figure 4: Is a diagrammatic view of a multi-layer multi view embodiment of the present invention in which the front display layer is viewable by both observers and two interlaced images displayed on the rear display layer are presented to different observers.
BEST MODES FOR CARRYING OUT THE INVENTION
In a first preferred embodiment a single layer display is used to at least two different images or display contents each image/display-content being presented to a different viewing angle to the images/display-content.
Figure one illustrates single layer multi view display used as an in-car navigation/entertainment device. A viewer (1) looking at the display (5) in the direction shown sees a movie being played (3), whilst a second viewer (2) looking at the display in the direction shown sees the image of a navigation system (4). In this embodiment the display layer (5) is adapted such that it comprises interlaced pixels of two different viewing angles. The movie is displayed on pixels of one viewing angle and the navigation images are displayed on pixels of the other viewing angle.
In a further preferred embodiment a multi-layered multi view device is used to display at least two different images or display contents each image/display-content being presented to a different viewing angle to the images/display-content.
Figure two illustrates a combined in-car navigation and entertainment display. A first layer with optimum viewing direction (6) is placed substantially collinear and as close to a second layer with an optimum viewing direction (8). In most cases there will be a diffusion layer (9) to abate moire interference. The displays can be back lit using either direct view lamps or a light pipe (10). A viewer viewing at an angle (6) will see image (3), and a viewer looking in direction (8) will see image (4).
In a further preferred embodiment a multi-layered multi view device is used to display layered images to one viewer and a single image to another viewer. Figure illustrates a multi layered multi view device. An image (15) is displayed on the first layer (13) with an optimum viewing direction (30) and an image (14) is displayed on a second layer (11) through a viewing angle enhancer (12) which expands the viewing angle (31) of second layer (11) with an optimum viewing angle of (31), such that a viewer (17) inline with the viewing angle of the first layer (30) would see a combined image (19) with the image (14) from the second layer (11) would appear at distance behind the image (15) from the first layer (13) and such that a second simultaneous viewer (16) outside the viewing angle (30) of the fist layer would see an image (18) only represented by the second layer (11).
In a further preferred embodiment a multi-layered multi view device is used in combination with an interlaced optical film or lens
Figure 4 illustrates a diagrammatic view of the multi-layered privacy embodiment where image (25) is displayed on the first layer (22) and multiple images (23, 24) are displayed on the back layer (20) such that the images are interlaced to match a lens stripe pattern (21) allowing a viewer (29) in position inline with pattern (32) matching the image (23) on the rear layer (20) would see a composite image (29) compromising the foreground image (25) in front of a background image (23) that is aligned with the viewers (27) position, while allowing a second simultaneous viewer in position inline with a pattern (33) matching the image (24) on the rear layer (20) would see a composite image (28) compromising the foreground image (25) in front of a background image (24) that is aligned with the viewer's position.
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 thereof.

Claims

WHAT WE CLAIM IS:
1. A multi view display comprising:
i) a display layer for the display of images;
ii) an un-braiding viewing angle manipulation means which manipulates the viewing angle of the images displayed on said display layer;
such that when at least two images are be interlaced and displayed on said display layer, each constituent image of the interlaced image is presented at the viewing angle as determined by the un-braiding viewing angle manipulation means.
2. A multi view display comprising an adapted display layer for the display of images wherein said adapted display layer comprises,
at least two different specified viewing angle pixels which are interlaced,
such that when at least two images are interlaced and displayed on said adapted display layer, each constituent image of the interlaced image is presented to the viewing angle as determined by the viewing angle of the interlaced specified viewing angle pixels.
3. A multi view display as claimed in claim 2 where an un-braiding viewing angle manipulation means is used to act on the adapted display layer(s).
4. A multi view display as claimed in claim 1 or 3 wherein the un-braiding viewing angle manipulation means is an adapted privacy film.
5. A multi view display as claimed in claim 1 or 3 wherein the un-braiding viewing angle manipulation means is an adapted optical film.
6. A multi view display as claimed in claim 1 or 3 wherein the un-braiding viewing angle manipulation means is an adapted lenticular lens.
7. A multi view display comprising:
i) at least two display layers for the display of images, said display layers being substantially planar and at least in part overlapping, wherein display layer(s) overlapping another display layer are selectively transparent;
ii) at least one viewing angle manipulation means acting upon at least one of the display layers and thereby manipulating the viewing angle of images displayed on the display layer(s) behind it;
such that images displayed on display layers on which the viewing angle manipulation means acts the image(s) is (are) presented at the viewing angle as determined by the viewing angle manipulation means.
8. A multi view display comprising:
at least two display layers for the display of images, said display layers being substantially planar and at least in part overlapping, wherein display layer(s) overlapping another display layer are selectively transparent;
where in at least one of the display layers is an adapted display layer comprising pixels which are specified viewing angle pixels;
such that images displayed on the at least one adapted display layer have a different viewing angle to the images displayed on the other (non-adapted) display layer(s).
9. A multi view display comprising:
i) at least two display layers for the display of images, said display layers being substantially planar and at least in part overlapping, wherein display layer(s) overlapping another display layer are selectively transparent; ii) an un-braiding viewing angle mampulation means acting upon at least one of the display layers and thereby manipulating the viewing angle of images displayed on the display layer(s) behind it;
such that when at least two images are be interlaced and displayed on a display layer which the un-braiding viewing angle manipulation means is acting upon, each constituent image of the interlaced image displayed on said layer(s) (which the un-braiding viewing angle manipulation means is acting upon) is presented at the viewing angle or viewing angles as determined by the un-braiding viewing angle manipulation means.
10. A multi view display comprising:
at least two display layers for the display of images, said display layers being substantially planar and at least in part overlapping, wherein display layer(s) that are overlapping another display layer are selectively transparent,
wherein at least one of the display layers is an adapted display layer comprising of at least two different specified viewing angle pixels which are interlaced such that when at least two images are interlaced and displayed on said adapted display layer, each constituent image of the interlaced image is presented to the viewing angle as determined by the viewing angle of the interlaced specified viewing angle pixels..
11. A multi view display comprising:
iii) at least two display layers for the display of images, said display layers being substantially planar and at least in part overlapping, wherein display layer(s) that are overlapping another display layer are selectively transparent,
iv) a viewing angle manipulation means acting upon at least one display,
such that images displayed upon display layers that the viewing angle manipulation means is acting on are presented to the viewing angle determined by the viewing angle manipulation means.
12. A multi view display as claimed in claim 8 or 9 where at least one unbraiding viewing angle manipulation means is used additionally.
13. A multi view display as claimed in claim 7 or 10 wherein at least one of the at least one un-braiding viewing angle manipulation means is an adapted privacy film.
14. A multi view display as claimed in claim 7, 10 or 11 wherein at least one of the at least one un-braiding viewing angle mampulation means is an adapted optical film.
15. A multi view display as claimed in claim 7, 10, 11 or 12 wherein the un- braiding viewing angle manipulation means is an adapted lenticular lens.
16. A multi view display as claimed in claim 7, 10, 11, 12 or 13 wherein the viewing angle manipulation means acting upon any display layer other than the front display layer is wide angle viewing diffuser.
17. An in-car utilising any of the multi view displays claimed in claims 1 to 14.
18. A method of operating a multi view display said multi view display having at least two viewing angles characterised by the steps of displaying each images intended for each viewing to the display layer which presents that image to the intended viewing angle.
19. Display software adapted to facilitate the display of images using multi view display said multi view display having at least two viewing angles said display software being adapted to execute the steps of transmitting each images intended for each viewing to the display layer which presents that image to the intended viewing angle:
20. A method of operating a multi view display said multi view display comprising at least two multi layered display layers characterised by the steps of: iii) displaying interlaced images on display layers on which an un-braiding viewing angle manipulation means acts
iv) displaying non-interlaced images on any display layers (if any) on which no un-braiding viewing angle manipulation means acts.
21. Display software adapted to facilitate the display of images using a multi view display said multi view display comprising at least two multi layered display layers, said display software being adapted to execute the steps of:
iii) transmitting interlaced images to display layer(s), said display layer(s) having an un-braiding viewing angle manipulation means acting upon it (them), said interlaced image being acted upon by said un-braiding viewing angle manipulation means to present the constituent images of the interlaced image to differing viewing angles, and
iv) transmitting (non-interlaced) image data to display layers (if any) on which no unbraiding viewing angle manipulation means acts said image data being used by said display components to display a images to the viewing angle inherent to said display layer.
22. A multi view display substantially as herein described with reference to and as illustrated by the accompanying drawings and/or examples.
23. A method of manufacturing a multi view display substantially as herein described with reference to and as illustrated by the accompanying drawings and/or examples.
24. Display software substantially as herein described above with reference to and as illustrated by the accompanying examples.
25. A method of operating a multi view display substantially as herein described with reference to and as illustrated by the accompanying drawings and/or examples.
PCT/NZ2003/000215 2002-09-20 2003-09-19 Multi-view display WO2004036286A1 (en)

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EP03808917A EP1546789A4 (en) 2002-09-20 2003-09-19 Multi-view display
AU2003265026A AU2003265026B2 (en) 2002-09-20 2003-09-19 Multi-view display
US12/948,638 US20110285609A1 (en) 2002-09-20 2010-11-17 Multi-view display

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CN1726418B (en) 2012-01-04
NZ521505A (en) 2005-05-27
AU2003265026A1 (en) 2004-05-04
JP2011008247A (en) 2011-01-13
US20110285609A1 (en) 2011-11-24
US20060191177A1 (en) 2006-08-31
US8146277B2 (en) 2012-04-03
JP2006504122A (en) 2006-02-02
EP1546789A1 (en) 2005-06-29
CN1726418A (en) 2006-01-25
KR101017196B1 (en) 2011-02-25
KR20050062554A (en) 2005-06-23
EP1546789A4 (en) 2011-04-20

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