NL2022313B1 - Autostereoscopic display - Google Patents

Autostereoscopic display Download PDF

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Publication number
NL2022313B1
NL2022313B1 NL2022313A NL2022313A NL2022313B1 NL 2022313 B1 NL2022313 B1 NL 2022313B1 NL 2022313 A NL2022313 A NL 2022313A NL 2022313 A NL2022313 A NL 2022313A NL 2022313 B1 NL2022313 B1 NL 2022313B1
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Netherlands
Prior art keywords
sub
pixels
pixel
rows
autostereoscopic
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NL2022313A
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Dutch (nl)
Inventor
van der horst Jan
Original Assignee
Zhangjiagang Kangde Xin Optronics Mat Co Ltd
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Application filed by Zhangjiagang Kangde Xin Optronics Mat Co Ltd filed Critical Zhangjiagang Kangde Xin Optronics Mat Co Ltd
Priority to NL2022313A priority Critical patent/NL2022313B1/en
Priority to PCT/CN2019/127626 priority patent/WO2020135360A1/en
Application granted granted Critical
Publication of NL2022313B1 publication Critical patent/NL2022313B1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
    • 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
    • H04N13/324—Colour aspects
    • 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
    • H04N13/388—Volumetric displays, i.e. systems where the image is built up from picture elements distributed through a volume
    • H04N13/395—Volumetric displays, i.e. systems where the image is built up from picture elements distributed through a volume with depth sampling, i.e. the volume being constructed from a stack or sequence of 2D image planes

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

Abstract

The invention relates to an autostereoscopic display comprising an array of sub—pixels lined with a view altering layer, such as a lenticular lens stack or a parallax barrier, wherein the view altering layer has a plurality of parallel elongate elements extending in a first direction and wherein the elongate elements are arranged with an element pitch in a second direction perpendicular to the first direction; wherein the array of sub—pixels has rows of sub—pixels extending in the second direction with the sub—pixels at a fixed sub—pixel pitch; wherein two subsequent rows of sub—pixels are shifted along the second direction relative to each other over a distance of l/n—th of the sub—pixel pitch, wherein n = 2, 3, 4, …; and wherein the element pitch is m+l/n—th of the sub—pixel pitch, wherein m = l, 2, 3, ...

Description

Autostereoscopic display The invention relates to an autostereoscopic display comprising an array of sub-pixels lined with a view altering layer, such as a lenticular lens stack or a parallax barrier, wherein the view altering layer has a plurality of parallel elongate elements extending in a first direction and wherein the elongate elements are arranged with an element pitch in a second direction perpendicular to the first direction; wherein the array of sub-pixels has rows of sub-pixels extending in the second direction with the sub-pixels at a fixed sub-pixel pitch.
Such an autostereoscopic display is known from EP 3093704. Typically, with an autostereoscopic display mounted on a wall or positioned on a desk, the first direction is the vertical direction, while the second direction is the horizontal direction.
With this known autostereoscopic display, rows of sub-pixels with a single color are provided.
An integer number of sub-pixels is positioned under one elongate element, such that a number of views, corresponding to the integer number of sub-pixels, is obtained.
By providing the subsequent rows of sub-pixels with different colors, such as red, green and blue, multicolored pixels can be provided underneath the elongate element for each view.
When an increase of views is desired, the number of sub-pixels arranged under one elongate element needs to be increased.
This however reduces the resolution in the second direction.
If for example two views are desired, only half of the pixels in a row can be used to compose a view.
If for example four views are desired, only a quarter of the pixelscan be used for a view, so the resolution is only a quarter of the resolution of the display.
With increasing resolution of the displays, the number of views can gradually be increased, while keeping the resolution for a view constant. However, increasing the resolution of a display becomes more difficult as the sizes of the sub-pixels become smaller and smaller.
It is therefore an object of the invention to reduce or even remove the above mentioned disadvantages.
This object is achieved with an autostereoscopic display according to the preamble, which is characterized in that two subsequent rows of sub-pixels are shifted along the second direction relative to each other over a distance of l/n-th of the sub-pixel pitch, wherein n = 2, 3, 4, .; and wherein the element pitch is m+1/n-th of the sub-pixel pitch, wherein m = 1, 2, 3, ..
With the autostereoscopic display according to the invention, the number of views is increased by using two or more rows of sub-pixels, which rows are shifted in the second direction, typically the horizontal direction. In this way the number of views can be increased, while maintaining the same resolution of the display and maintaining also the same resolution in the second direction, but the resolution in the first direction will decrease as a result of this invention.
Considering an autostereoscopic display with two sub-pixels under an elongate element, the resolution in the second direction will be 50% of the display, but will be 100% of the display in the first direction. Now by using the invention, a second row of sub-pixels is shifted over half the sub-pixel pitch. The combined two rows now can provide four views, instead of two views. The resolution in the second direction will still be 50% of the display. However, the resolution in the first direction will be decreased to 50% ofthe display resolution.
With an autostereoscopic display according to the invention, it will thus be possible to better divide the decrease of resolution in the first and second direction.
The shifting of the rows of sub-pixels has the additional advantage that the moire effect is reduced. Typically some distance is required between the sub-pixels of the rows for accommodating electrical wiring in order to control the sub-pixels (blackmatrix). With the rows of sub-pixels straight under each other, variations in intensities caused by the distance between the sub-pixels results in a moire effect.
Now with the invention, the subsequent rows of pixels are no longer aligned, but shifted, such that the spacing between the sub-pixels of subsequent rows are no longer aligned in the first direction, which at least reduces the moire effect.
In a preferred embodiment of the autostereoscopic display according to the invention the sub-pixels of a row have a single color and the array of sub-pixels has in the first direction a repetitive pattern of rows of sub-pixels of different colors, for example red, green and blue, wherein the adjacent sub-pixels within the repetitive pattern in the first direction compose a pixel.
By combining sub-pixels of different color, a main pixel is composed, which is able to emit a spectrum of colors. As the sub-pixels are arranged in rows of single color, the composed, main pixel will extend in the first direction and therefore be under a single elongate element, such that the composed pixel is used for a single view.
In another embodiment, the different colors for a main pixel are arranged in a fixed pattern over a number of sub-pixels either in the same row or a number of adjacentrows.
By arranging the different colors in a fixed pattern, the pattern can be optimized for a desired type of autostereoscopic display or for a desired use of such a display.
Preferably, the elongate elements of the view altering layer are elongate lenses of a lenticular lens stack.
In yet another embodiment of the autostereoscopic display according to the invention the edges of each sub-pixel are non-parallel with the first direction.
With the edges of each sub-pixel being non-parallel with the first direction, it is prevented that the edges and therefore the space between the sub-pixels coincides with the first direction. As a result, the moire effect is prevented because in the first direction, the overall intensity will more or less be the same at each position along the second direction. So, with the edges of the sub-pixels being non-parallel with the first direction, no longer lines in first direction with a substantial reduced intensity are present and the moire effect is therefore reduced.
The sub-pixels preferably have a polygonal shape, such as a hexagonal shape. The polygonal shape allows a compact nesting of the sub-pixels, while the edges are non-parallel with the first direction.
In a further embodiment of the autostereoscopic display according to the invention each sub-pixel has a trapezoid shape with the parallel sides of the trapezoid shape parallel to the second direction and wherein the shape of successive sub-pixels in the second direction are mirrored over both the first direction and the second direction.
With the shape being trapezoid and having the shape mirrored for each alternating sub-pixel a very compact packing of the sub-pixels is obtained, while keeping the edgesnonparallel to the first direction.
In a very preferred embodiment of the autostereoscopic display according to the invention each sub-pixel has an isosceles trapezoid shape.
5 These and other features of the invention will be elucidated in conjunction with the accompanying drawings.
Figure 1 shows a schematic perspective view of an embodiment of the autostereoscopic display according to the invention.
Figure 2 shows a first schematic top view of figure 1.
Figure 3 shows a second schematic top view of figure 1.
Figure 1 shows a schematic perspective view of an embodiment of an autostereoscopic display 1 according to the invention. The display 1 has a substrate 2 on which an array with rows 3, 4, 5, 6 of sub-pixels R, G, B, R are arranged. Each row 3, 4, 5, 6 has a single color R,G,B of sub-pixels.
The array of sub-pixels R, G, B is lined with a lenticular lens stack having elongate lenses 7, which extend in a first direction V, while the rows 3, 4, 5, 6 extend in a second, perpendicular direction H.
Figure 2 shows a first schematic top view of figure
1. The elongate lens 7 1s shown with dashed lines over the array of sub-pixels R, G, B.
The rows 3, 4, 5, 6 comprise a plurality of sub-pixels R, G, B, R respectively, which each have an isosceles trapezoid shape and wherein the shape is alternately mirrored over the first direction V as well as the second direction H. This allows for a very compact packing of the sub-pixels R, G, B, while there is still enough space 8 present between the sub-pixels R, G, B, to accommodate for wiring.
The row 3 has sub-pixels R of a single color. The row 6 is the subsequent row with sub-pixels R of the same, single color. The sub-pixels R are arranged at a sub-pixel pitch Py, and the row 6 is shifted along the second direction H over % Ps relative to the row 3.
The lenses 7 of the lenticular lens stack have a width and therefore corresponding pitch of Pt. The elongate lens 7 covers in this embodiment three and a half sub-pixels R of a row 3, such that Pg = (m + 1/n)P,, where m=3 and n=2. For other embodiments, m is an integer and starts at 1, i.e. m= 1, 2, 3, ., while n is also an integer starting at 2, i.e. n = 2, 3, 4, … . The same applies for the other rows 4, 5, 6, wherein in particular row 6 is shifted % P, relative to the row 3.
As schematically shown in figure 3, this arrangement results in a row 3 with a single color of sub-pixels R and a subsequent row 6 with the same single color of sub-pixels R, wherein 3 % sub-pixels R of each row 3, 6 are covered by the elongate lens 7. Because the subsequent row 6 is shifted over % Ps, seven separate views Vi — V; are created: four by the row 3 and three by the subsequent row 6 (for the adjacent lens 7, four views will be created by the row 6 and three by the row 3, such that each row 3, 6 will on average provide 3% view for each lens 7).
So, with an autostereoscopic display according to the invention the number of views can be increased by combining subsequent rows of sub-pixels and by shifting the subsequent rows. For example, when a lens would cover three and a third sub-pixels, then three rows should be used, each shifted over 1/3 Pp. This will result in 3 * 3 1/3 = 10 views.

Claims (9)

ConclusiesConclusions 1. Autostereoscopisch scherm omvattende een array van sub-beeldpunten die is bekleed met een zichtveranderende laag, zoals een lenticulaire lens stack of een parallax barrier, waarin de zichtveranderende laag een meervoud van parallelle langwerpige elementen heeft die zich uitstrekken in een eerste richting en waarin de langwerpige elementen zijn opgesteld met een elementsteekafstand in een tweede richting haaks op de eerste richting; waarin de array van sub-beeldpunten rijen heeft van sub-beeldpunten die zich uitstrekken in de tweede richting met de sub-beeldpunten op een vaste sub-beeldpunt-steekafstand; met het kenmerk dat twee opeenvolgende rijen van sub-beeldpunten ten opzichte van elkaar verschoven zijn in de tweede richting over een afstand van 1/n-de van de sub-beeldpunt-steekafstand, waarin n = 2, 3, 4, …j en waarin de elementsteekafstand gelijk is aan m+1/n-de van de sub-beeldpunt-steekafstand, waarin m = 1, 2, 3, ..An autostereoscopic display comprising an array of sub-pixels coated with a vision altering layer, such as a lenticular lens stack or a parallax barrier, wherein the vision altering layer has a plurality of parallel elongated elements extending in a first direction and in which the elongated elements are arranged with an element pitch distance in a second direction at right angles to the first direction; wherein the array of sub-pixels has rows of sub-pixels extending in the second direction with the sub-pixels at a fixed sub-pixel pitch; characterized in that two consecutive rows of sub-pixels are offset from each other in the second direction by a distance of 1 / nth of the sub-pixel pitch, where n = 2, 3, 4, ... j and where the element pitch is equal to m + 1 / nth of the sub-pixel pitch, where m = 1, 2, 3, .. 2. Autostereoscopisch scherm volgens conclusie 1, waarin de sub-beeldpunten van een rij een enkele kleur hebben en waarin de array van sub-beeldpunten in de eerste richting een herhalend patroon heeft van rijen van sub-beeldpunten van verschillende kleuren, bijvoorbeeld rood, groen en blauw, waarin de aanliggende sub-beeldpunten binnen het herhalend patroon in de eerste richting een beeldpunt vormen.The autostereoscopic display of claim 1, wherein the sub-pixels of a row are of a single color and wherein the array of sub-pixels in the first direction has a repeating pattern of rows of sub-pixels of different colors, e.g. red, green. and blue, wherein the adjacent sub-pixels within the repeating pattern in the first direction form a pixel. 3. Autostereoscopisch scherm volgens conclusie 1, waarin de verschillende kleuren voor een beeldpunt zijnopgesteld in een vast patroon over een aantal sub-beeldpunten in ofwel dezelfde rij ofwel een aantal aanliggende rijen.The autostereoscopic screen of claim 1, wherein the different colors for a pixel are arranged in a fixed pattern over a number of sub-pixels in either the same row or a number of adjacent rows. 4. Autostereoscopisch scherm volgens een der voorgaande conclusies, waarin de langwerpige elementen van de zichtveranderende laag langwerpige lenzen zijn van een lenticulaire lens stack.An autostereoscopic display according to any preceding claim, wherein the elongated elements of the vision change layer are elongated lenses of a lenticular lens stack. 5. Autostereoscopisch scherm volgens een der voorgaande conclusies, waarin de randen van elk sub-beeldpunt niet-parallel zijn aan de eerste richting.Autostereoscopic screen according to any one of the preceding claims, wherein the edges of each sub-pixel are non-parallel to the first direction. 6. Autostereoscopisch scherm volgens conclusie 5, waarin elk sub-beeldpunt een polygonale vorm heeft.The autostereoscopic screen of claim 5, wherein each sub-pixel has a polygonal shape. 7. Autostereoscopisch scherm volgens conclusie 6, waarin elk sub-beeldpunt een trapezoïde vorm heeft met de parallelle zijden van de trapezolde vorm parallel aan de tweede richting en waarin de vorm van opeenvolgende sub-beeldpunten in de tweede richting is gespiegeld over zowel de eerste richting als de tweede richting.The autostereoscopic display of claim 6, wherein each sub-pixel has a trapezoid shape with the parallel sides of the trapezoid shape parallel to the second direction and wherein the shape of successive sub-pixels in the second direction is mirrored over both the first direction. as the second direction. 8. Autostereoscopisch scherm volgens conclusie 7, waarin elk sub-beeldpunt een gelijkbenige trapezoïde vorm heeft.The autostereoscopic screen of claim 7, wherein each sub-pixel has an isosceles trapezoid shape. 9. Autostereoscopisch scherm volgens conclusie 6, waarin elk sub-beeldpunt een hexagonale vorm heeft.The autostereoscopic screen of claim 6, wherein each sub-pixel has a hexagonal shape.
NL2022313A 2018-12-24 2018-12-24 Autostereoscopic display NL2022313B1 (en)

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NL2022313A NL2022313B1 (en) 2018-12-24 2018-12-24 Autostereoscopic display
PCT/CN2019/127626 WO2020135360A1 (en) 2018-12-24 2019-12-23 Autostereoscopic display

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EP2490451A1 (en) * 2011-02-18 2012-08-22 Koninklijke Philips Electronics N.V. Autostereoscopic display device
EP3093704A1 (en) 2012-09-27 2016-11-16 NLT Technologies, Ltd. Liquid crystal image display apparatus for displaying 2d/3d images

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JP5923817B2 (en) * 2011-02-08 2016-05-25 Ｎｌｔテクノロジー株式会社 Liquid crystal display
KR20120103101A (en) * 2011-03-10 2012-09-19 삼성전자주식회사 Display apparatus and method of displaying three dimensional image using the same
JP5761498B2 (en) * 2011-03-28 2015-08-12 Ｎｌｔテクノロジー株式会社 Image display device, driving method of image display device, and terminal device
CN102183842A (en) * 2011-04-15 2011-09-14 黑龙江省四维影像数码科技有限公司 Autostereoscopic display equipment sub-pixel arranging method based on vertical column mirror grating
KR102013380B1 (en) * 2013-03-20 2019-08-23 엘지디스플레이 주식회사 Stereoscopic image display device of non glasses type
KR102171611B1 (en) * 2013-12-31 2020-10-30 엘지디스플레이 주식회사 Stereopsis image display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006010971A1 (en) * 2005-03-09 2006-09-21 Newsight Gmbh Autostereoscopic viewing method e.g. for images, involves having arrays providing defined propagation directions for light which emerge from one of arrays through one array from light source and oriented to array of transparent elements
EP2490451A1 (en) * 2011-02-18 2012-08-22 Koninklijke Philips Electronics N.V. Autostereoscopic display device
EP3093704A1 (en) 2012-09-27 2016-11-16 NLT Technologies, Ltd. Liquid crystal image display apparatus for displaying 2d/3d images

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