WO2007069106A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

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Publication number
WO2007069106A1
WO2007069106A1 PCT/IB2006/054390 IB2006054390W WO2007069106A1 WO 2007069106 A1 WO2007069106 A1 WO 2007069106A1 IB 2006054390 W IB2006054390 W IB 2006054390W WO 2007069106 A1 WO2007069106 A1 WO 2007069106A1
Authority
WO
WIPO (PCT)
Prior art keywords
display
display device
rows
lenticular
pixels
Prior art date
Application number
PCT/IB2006/054390
Other languages
English (en)
Inventor
Hans Zuidema
Henricus J. C. Kuijpers
Laurens Doornhein
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2007069106A1 publication Critical patent/WO2007069106A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/349—Multi-view displays for displaying three or more geometrical viewpoints without viewer tracking
    • H04N13/351—Multi-view displays for displaying three or more geometrical viewpoints without viewer tracking for displaying simultaneously
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • H04N13/305—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using lenticular lenses, e.g. arrangements of cylindrical lenses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • H04N13/317—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using slanted parallax optics

Definitions

  • This invention relates to an autostereoscopic display device comprising a display panel having an array of display pixels for producing a display, and a plurality of lenticular elements arranged over the display panel and through which the display pixels are viewed.
  • a known autostereoscopic display device is described in GB 2196166 A.
  • This known device comprises a two dimensional liquid crystal display panel having a row and column array of display pixels acting as a spatial light modulator to produce the display.
  • An array of elongate lenticular elements extending parallel to one another overlies the display pixel array, and the display pixels are observed through these lenticular elements.
  • the lenticular elements are provided as a sheet of elements, each of which comprises an elongate semi-cylindrical lens element.
  • the lenticular elements extend in the column direction of the display panel, with each lenticular element overlying a respective group of two or more adjacent columns of display pixels.
  • each lenticule is associated with two columns of display pixels
  • the display pixels in each column provide a vertical slice of a respective two dimensional sub-image.
  • the lenticular sheet directs these two slices and corresponding slices from the display pixel columns associated with the other lenticules, to the left and right eyes of a user positioned in front of the sheet, so that the user observes a single stereoscopic image.
  • each lenticule is associated with a group of four or more adjacent display pixels in the row direction. Corresponding columns of display pixels in each group are arranged appropriately to provide a vertical slice from a respective two dimensional sub-image. As a user's head is moved from left to right a series of successive, different, stereoscopic views are perceived creating, for example, a look-around impression.
  • the above described device provides an effective three dimensional display.
  • a display panel having an array of 600 rows and 800 columns of display pixels may provide a four- view autostereoscopic display in which each view comprises an array of 600 rows and 200 pixels. This substantial difference between vertical and horizontal resolution is undesirable.
  • US patent No. 6,064,424 discloses an autostereoscopic display device similar to that described above, except that the elongate lenticular elements are slanted at an angle to the column direction of the display panel. By slanting the lenticular elements, some of the reduction in horizontal resolution, which would otherwise be required, is transferred to the vertical resolution. It thus becomes possible to "consume" both vertical and horizontal resolution to increase the number views displayed by the device.
  • the device disclosed in the above mentioned US patent overcomes the problem associated with a reduction in horizontal resolution.
  • by slanting the lenticular elements at an angle to the columns of display pixels other problems are introduced. In particular, as a user's head is moved from left to right, variations in light intensity are observed. These intensity variations are caused by the lenticular elements imaging varying amounts of the opaque black mask that defines the pixel areas of the display panel. The variations are observed by the user as moire interference.
  • an autostereoscopic display device comprising: a display panel having an array of display pixels for producing a display, the display pixels being arranged in rows and columns; and a plurality of rows of lenticular elements arranged over the display panel, the rows of lenticular elements being parallel to the rows of display pixels, each lenticular element having an optical focal axis perpendicular to the row direction, wherein lenticular elements in adjacent rows are offset relative to one another in the row direction.
  • the device of the invention has a plurality of rows of shorter lenticular elements that are not slanted. Adjacent ones of these shorter lenticular elements in the column direction form a "staircase" configuration, i.e. they are offset relative to one another. A "staircase" of the lenticular elements then performs the function performed in the prior art by one slanted elongate lenticular element, but without the undesirable effects of slanted lenticular elements.
  • Each lenticular element may overlie a plurality of display pixels in the row direction, and the same pixel for several different images, or "views", can then be projected by the element.
  • each lenticular element may overlie just one display pixel in the column direction.
  • the same pixel for several different views may be projected by adjacent lenticular elements in different rows.
  • a height of each lenticular element in the column direction may be less (preferably only slightly less) than the display pixel pitch in the column direction. In this way, vertical parallax effects at short viewing distances may be minimized.
  • the upper and lower edges of the lenticular element may overlie the opaque mask of the display panel.
  • the offset between adjacent lenticular elements in different rows may be a fixed distance less than or equal to the display pixel pitch in the row direction.
  • the offset between lenticular elements in adjacent rows may be substantially equal to the whole or half of the display pixel pitch in the row direction.
  • the display pixels may have a rectangular shape, the longer edges of the display pixels extending in the column direction. Such a pixel shape and orientation is entirely conventional, and the invention may therefore be based on mass produced display panels.
  • the rows and columns of display pixels may be orthogonal.
  • the ratio of the display pixel pitch and the display pixel width in the row direction may be greater than or equal to 2: 1.
  • the display pixel width may be equal to the width of the gap (for example provided by a mask) between the display pixels, in the row direction.
  • the display panel may be a liquid crystal display panel. Such display panels are particularly suitable for use in autostereoscopic display devices.
  • the display panel may comprise an opaque mask for defining the display pixel areas.
  • a display pixel may be provided at every intersection of the display pixel rows and columns.
  • Fig. 1 is a schematic perspective view of a known autostereoscopic display device
  • Fig. 2 is a schematic plan view of the display device shown in Fig. 1; and Fig. 3 is a schematic plan view of an embodiment of the invention.
  • the invention provides an autostereoscopic display device having a plurality of rows of lenticular elements arranged over a display panel in a "staircase” configuration.
  • This "staircase" configuration addresses problems associated with prior art slanting lenticular elements, namely light intensity variations and cross talk between views.
  • Figure 1 is a schematic perspective view of a known direct view autostereoscopic display device 1.
  • the known device 1 comprises a liquid crystal display panel 3 of the active matrix type that acts as a spatial light modulator to produce the display.
  • the display panel 3 has an orthogonal array of display pixels 5 arranged in rows and columns. For the sake of clarity, only a small number of display pixels 5 are shown in the Figure. In practice, the display panel 3 might comprise about one thousand rows and several thousand columns of display pixels 5.
  • the structure of the liquid crystal display panel 3 is entirely conventional.
  • the panel 3 comprises a pair of spaced transparent glass substrates, between which an aligned twisted nematic or other liquid crystal material is provided.
  • the substrates carry patterns of transparent indium tin oxide (ITO) electrodes on their facing surfaces.
  • ITO transparent indium tin oxide
  • Polarizing layers are also provided on the outer surfaces of the substrates.
  • Each display pixel 5 comprises opposing electrodes on the substrates, with the intervening liquid crystal material therebetween.
  • the shape and layout of the display pixels 5 are determined by the shape and layout of the electrodes.
  • the display pixels 5 are regularly spaced from one another by gaps.
  • Each display pixel 5 is associated with a switching element, such as a thin film transistor (TFT) or thin film diode (TFD).
  • TFT thin film transistor
  • TFD thin film diode
  • the display pixels are operated to produce the display by providing addressing signals to the switching elements, and suitable addressing schemes will be known to those skilled in the art.
  • the gaps between the display pixels 5 are covered by an opaque black mask.
  • the mask is provided in the form of a grid of light absorbing material.
  • the mask covers the switching elements and defines the individual display pixel areas.
  • the display panel 3 is illuminated by a light source 7 comprising, in this case, a planar backlight extending over the area of the display pixel array. Light from the light source 7 is directed through the display panel 3, with the individual display pixels 5 being driven to modulate the light and produce the display.
  • the display device 1 also comprises a lenticular sheet 9 arranged over the display side of the display panel 3.
  • the lenticular sheet 9 comprises a row of lenticular elements extending parallel to one another.
  • Figure 2 is a schematic plan view of the display device 1 shown in Figure 1. Again, only a small number of the display pixels 5 a are shown for the sake of clarity.
  • the lenticular elements 11, of which only one is shown, are slanted at an angle to the column direction of the display pixels 5, i.e. their longitudinal axis defines an acute angle with the column direction of the display pixels 5.
  • the lenticular elements 11 are in the form of convex cylindrical lenses, and they act as an optical director means to provide different images, or views, from the display panel 3 to the eyes of a user positioned in front of the display device 1.
  • the lenticular elements 11 also provide a number of different images, or views, to the eyes of the user as the user's head moves from left to right in front of the display device 1.
  • the autostereoscopic display device 1 shown in Figures 1 and 2 is capable of providing nine different views.
  • the lenticular element 11 projects two pixels 5 in each of nine different directions, so as to form the nine different views.
  • the display pixels 5 in Figure 2 are labeled from “1" to "9" to indicate to which of the views they correspond.
  • the lenticular element 11 also projects portions of the black mask 13 provided between the display pixels 5.
  • the lenticular element 11 shown in Figure 2 overlies a group of eighteen display pixels 5.
  • the dashed line 15 indicates a portion of the display panel 3 that is projected by the lenticular element 11 in one particular direction to produce one of the nine different views.
  • two display pixels for view "4" are projected, as is a significant amount of the black mask 13.
  • Small amounts of display pixels for the neighboring views "3" and "5" are also projected, and this is observed as cross talk between the views.
  • FIG. 3 A schematic plan view of an autostereoscopic display device 21 according to the invention is shown in Figure 3.
  • the display device 21 shown in Figure 3 is similar in many ways to the device shown in Figures 1 and 2, and like numerals indicate like features.
  • the display device shown in Figure 3 comprises a display panel and a light source (not shown) that are identical to those described above with reference to Figure 1.
  • the display device 21 shown in Figure 3 also comprises a lenticular sheet that overlies the output side of the display panel.
  • the configuration of the lenticular sheet differs significantly from that shown in Figure 2, as will now be described with reference to Figure 3.
  • the lenticular sheet comprises a plurality of rows of lenticular elements 23, although for the sake of clarity only one element 23 is shown in each row.
  • the lenticular elements 21 are in the form of individual convex cylindrical lenses, and they act as an optical director means to provide different images, or views, from the display panel to the eyes of a user positioned in front of the display device 21.
  • the lenticular elements 23 also provide a number of different images, or views, to the eyes of the user as the user's head moves from left to right in front of the display device 1.
  • the lenticular elements 23 are arranged so that their focal axes lie parallel to the column direction of the display pixels 5.
  • the lenticular elements 23 each overlie a single display pixel 5 in the column direction, with their upper and lower edges overlying the black mask 13.
  • the lenticular elements each overlie four and a half display pixels 5 in the row direction, with their left or right edge overlying the black mask 13.
  • the lenticular elements 23 of each row are aligned, so that the edges of adjacent elements 23 in the same row meet.
  • Adjacent lenticular elements 23 in different rows are offset from each other, as shown in the Figure.
  • adjacent lenticular elements in different rows are offset by half the pitch of the display pixels 5 in the row direction, so that they have a "staircase” configuration.
  • a "staircase" of four lenticular elements 23, as shown in Figure 3 is capable of providing nine different views.
  • the lenticular elements 23 project two pixels 5 in each of nine different directions, so as to form the nine different views.
  • the display pixels 5 in Figure 3 are labeled from "1" to "9" to indicate to which of the views they correspond.
  • the lenticular elements 23 also project portions of the black mask 13 provided between the display pixels 5.
  • the four lenticular elements 23 shown in Figure 3 overlie a group of eighteen display pixels 5.
  • the dashed line 25 indicates a portion of the display panel 3 that is projected by the lenticular elements 23 in one particular direction to produce one of the nine different views.
  • two display pixels for view "7" are projected, as is a significant amount of the black mask 13. None of the neighboring display pixels for the other views are also projected. Accordingly, cross talk between the views is prevented.
  • the focal axes of the lenticular elements 23 extend in the same direction as the column direction of the display pixels 5, the amount of display pixel and black mask 13 received by the user's eyes as his/her head moves from left to right remains constant.
  • the group of four lenticular elements project the height of two display pixels, regardless of the angle from which the display is observed.
  • the focal axes of the lenticular elements 23 extending in the same direction as the column direction of the display pixels 5 is that cross talk between views is eliminated.
  • the lenticular elements 23 never project the display pixels for more than one of the views, as shown in Figure 3.
  • the "staircase" of lenticular elements therefore avoids the problems associated with slanting lenticular elements.
  • the "staircase” arrangement also provides the advantage of a slanting lenticular element, namely "consuming" both vertical and horizontal resolution to increase the number views displayed by the device, as described above.
  • liquid crystal display panel having, for example, a display pixel pitch in the range 50 ⁇ m to 1000 ⁇ m.
  • OLED organic light emitting diode
  • CRT cathode ray tube
  • pixel has been used. This term is intended to refer to independently switchable display elements, and therefore includes sub- pixels in a color display.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

L'invention concerne un dispositif d'affichage autostéréoscopique qui comprend un panneau d'affichage comportant un ensemble de pixels d'affichage pour produire un affichage. Lesdits pixels d'affichage sont disposés en lignes et en colonnes. Le dispositif selon l'invention comprend également une pluralité de lignes d'éléments lenticulaires disposés sur le panneau d'affichage. Les lignes d'éléments lenticulaires sont parallèles aux lignes de pixels d'affichage. Chaque élément lenticulaire présente un axe focal optique perpendiculaire au sens des lignes. Les éléments lenticulaires situés dans des lignes adjacentes sont décalés les uns par rapport aux autres dans le sens de la ligne de façon à présenter une disposition 'en escalier'.
PCT/IB2006/054390 2005-12-13 2006-11-22 Dispositif d'affichage WO2007069106A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05112086 2005-12-13
EP05112086.3 2005-12-13

Publications (1)

Publication Number Publication Date
WO2007069106A1 true WO2007069106A1 (fr) 2007-06-21

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PCT/IB2006/054390 WO2007069106A1 (fr) 2005-12-13 2006-11-22 Dispositif d'affichage

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WO (1) WO2007069106A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120007899A1 (en) * 2009-03-17 2012-01-12 Koninklijke Philips Electronics N.V. Methods of driving colour sequential displays
FR2980661A1 (fr) * 2011-09-27 2013-03-29 Roger Abraham Sultan Vision 3d sans lunettes sur ecran plat
EP2845047A1 (fr) * 2012-04-30 2015-03-11 Hewlett-Packard Development Company, L.P. Système et procédé de présentation d'images 3d pour un affichage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0791847A1 (fr) * 1996-02-23 1997-08-27 Koninklijke Philips Electronics N.V. Dispositif d'affichage autostéréoscopique
WO2003007053A2 (fr) * 2001-07-13 2003-01-23 Mems Optical, Inc. Afficheur autostereoscopique avec microlentille inversee et procede pour afficher des images multidimensionnelles, plus specifiquement des images couleur
EP1455540A2 (fr) * 2003-03-03 2004-09-08 Lg Electronics Inc. Appareil d'affichage d'images tridimensionnelles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0791847A1 (fr) * 1996-02-23 1997-08-27 Koninklijke Philips Electronics N.V. Dispositif d'affichage autostéréoscopique
WO2003007053A2 (fr) * 2001-07-13 2003-01-23 Mems Optical, Inc. Afficheur autostereoscopique avec microlentille inversee et procede pour afficher des images multidimensionnelles, plus specifiquement des images couleur
EP1455540A2 (fr) * 2003-03-03 2004-09-08 Lg Electronics Inc. Appareil d'affichage d'images tridimensionnelles

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120007899A1 (en) * 2009-03-17 2012-01-12 Koninklijke Philips Electronics N.V. Methods of driving colour sequential displays
US9613559B2 (en) 2009-03-17 2017-04-04 Koninklijke Philips N.V. Displays with sequential drive schemes
FR2980661A1 (fr) * 2011-09-27 2013-03-29 Roger Abraham Sultan Vision 3d sans lunettes sur ecran plat
EP2845047A1 (fr) * 2012-04-30 2015-03-11 Hewlett-Packard Development Company, L.P. Système et procédé de présentation d'images 3d pour un affichage
EP2845047A4 (fr) * 2012-04-30 2015-04-15 Hewlett Packard Development Co Système et procédé de présentation d'images 3d pour un affichage

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