WO2007111402A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2007111402A1
WO2007111402A1 PCT/KR2006/002693 KR2006002693W WO2007111402A1 WO 2007111402 A1 WO2007111402 A1 WO 2007111402A1 KR 2006002693 W KR2006002693 W KR 2006002693W WO 2007111402 A1 WO2007111402 A1 WO 2007111402A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
display device
crystal display
panel
substrates
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2006/002693
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English (en)
Inventor
Kah Hyun Hur
Jin Woo Bae
Hee Hyuk Jang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iljin Display Co Ltd
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Iljin Display Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iljin Display Co Ltd filed Critical Iljin Display Co Ltd
Publication of WO2007111402A1 publication Critical patent/WO2007111402A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1396—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3114—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing one colour at a time
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133749—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for low pretilt angles, i.e. lower than 15 degrees
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
    • G02F1/133784—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by rubbing

Definitions

  • the present invention in general, relates to a liquid crystal display (LCD) device employing a field sequential drive method to reproduce color images and, in particular, relates to an LCD device optimized for a field sequential drive method by offering, among others, an improved liquid crystal response time.
  • LCD liquid crystal display
  • a conventional LCD device is composed primarily of an LCD panel comprising a pair of glass substrates bonded together, with a liquid crystal layer interposed between them and a backlight unit placed behind the first glass substrate to provide light to the LCD panel.
  • an LCD device In order to reproduce color, such an LCD device must have three cells with a red, green, or blue color filter in front of each. This filter only allows light within a specific range of wavelengths to pass through, absorbing more than two thirds of the incident light. To compensate for the reduced luminance requires a commensurate increase in the power consumption of the backlight unit.
  • color filters are expensive compared to other LCD materials, thus increasing the manufacturing cost considerably. An effort to solve these problems, a field sequential LCD device can reproduce a full range of colors without color filters.
  • FIG. 1 illustrates a conventional field sequential LCD device.
  • the construction of a field sequential LCD device is almost identical to that of a general LCD device except for their light source and the absence of color filters in the former.
  • a field sequential LCD device is composed of an LCD panel and the red, green, and blue light sources 11: the former comprising a first transparent glass substrate 12 and a second transparent glass substrate 13 bonded together, between which a liquid crystal layer 14 is sandwiched; the latter placed at the back of the first glass substrate 12 to provide light to the LCD panel.
  • a field sequential LCD device sequentially turns on and off the red, green, and blue light sources 11 for a given frame to display a color image.
  • a liquid crystal mode offering a response time faster enough to meet such a high speed operations of the light sources. Since prior technologies using a nematic liquid crystal, in particular, proved incapable of providing an adequate response time, a new technology to replace them was required.
  • ferroelectric liquid crystal display offers a substantially faster response time.
  • the response of each molecule is directly driven by a force proportional to the product of its dipole moment and the strength of the electric field. Accordingly, the response time of a ferroelectric liquid crystal is in the range of 1 to lOO ⁇ s, which is incomparably superior to that of a nematic liquid crystal.
  • change of luminance in a ferroelectric liquid crystal display is achieved by inversion of spontaneous polarization, the rising and falling time are always identical.
  • a ferroelectric liquid crystal alignment is extremely susceptible to impact.
  • ferroelectric liquid crystal displays are fairly expensive and poor at reproducing gray scale tones.
  • FIG. 2 illustrates a projection LCD.
  • Projection LCDs are meant to meet the demand for larger TV sets that are not as expensive as plasma display panel (PDP) equivalents.
  • PDP plasma display panel
  • a conventional projection LCD device has a complicated optical engine comprising a light source 21, an illuminating lens system 22, a plurality of dichroic mirrors 23, relay lenses 25, reflecting mirrors 24, a cross dichroic prism 26, and liquid crystal panels 27.
  • the projection LCD system requires three separate LCD panels through which red, green, and blue signals respectively pass. Designing and manufacturing such a complicated device in a manner to ensure a high resolution inevitably leads to a high manufacturing cost. Besides the cost involved, such a lot of components will increase the floor space a set housing them takes up. Furthermore, the use of a cooling fan may result in airborne particles getting stuck on the mirrors and lenses and thus distorting images.
  • An object of the present invention is to provide a projection type full-color field sequential LCD device, characterized by high transmittance and luminance, without a complicated optical engine.
  • An embodiment of the present invention uses a nematic liquid crystal having a high refractive index anisotropy and a reduced twist angle. The thickness of the liquid crystal layer has been reduced as well.
  • Advantages of this embodiment include: improved photoefficiency due to adoption of a field sequential drive method; wider viewing angle and higher transmittance; ease and lower cost of manufacturing as well as a more compact design due to the fact that an expensive, complicated optical engine is not required; and availability of a larger view free from ghosting, or motion artifacts (blur), when viewing video images.
  • FIG. 1 illustrates a conventional field sequential LCD device
  • FIG. 2 illustrates a conventional projection LCD device
  • FIGS. 3 and 4 are cross-sectional views of an LCD panel according to the present invention having a horizontally aligned liquid crystal layer when no voltage is applied and when a voltage is applied;
  • FIGS. 5 and 6 are cross-sectional views of an LCD panel according to the present invention having a vertically aligned liquid crystal layer when no voltage is applied and when a voltage is applied;
  • FIG. 7 is a graph showing the relationship between the thickness and response time of a liquid crystal layer according to the present invention.
  • FIG. 8 is a graph showing the relationship between the twist angle and transmittance of a liquid crystal layer according to the present invention.
  • FIG. 9 is a schematic diagram illustrating the construction of a transmissive LCD device according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing the construction of a reflective LCD device according to another embodiment of the present invention.
  • FIG. 11 is a schematic diagram illustrating the construction of a projection LCD device according to yet another embodiment of the present invention.
  • FIG. 12 is a schematic diagram illustrating the construction of a projection LCD device according to still another embodiment of the present invention.
  • FIG. 10 is a schematic diagram illustrating the construction of a reflective LCD according to a preferred embodiment of the present invention.
  • the reflective LCD comprises an LCD panel having a pair of alignment films 35 and a liquid crystal layer 36 formed between a first substrate 33 and a second substrate 34; a light source 71; and a polarizing beam splitter 82.
  • a transparent electrode (not shown) is formed of a transparent conductive material such as indium tin oxide between the second substrate 34 and the alignment film 35.
  • the electrode placed between the first substrate 33 and the alignment film 35 may preferably be a reflective electrode formed of aluminum or other material capable of reflecting incident light.
  • a field sequential drive module (not shown) and the light source 71 are connected to the LCD panel. Light emitted from the light source 71 is transmitted via the polarizing beam splitter 82 to the reflective electrode 81 where it is reflected straight back to the outside.
  • FIGS. 3 and 4 are cross-sectional views of an LCD panel according to the present invention having a horizontally aligned liquid crystal layer.
  • FIG. 3 illustrates the alignment configuration of a liquid crystal layer when no voltage is applied
  • FIG. 4 illustrates the alignment configuration of the liquid crystal layer when a voltage has been applied.
  • the LCD panel comprises a pair of substrates 33 and 34 coated with conductive electrodes; a pair of alignment films 35 formed on the first and second substrates 33 and 34 respectively; and a liquid crystal layer 36 interposed in a specified thickness (d) between the alignment films 35.
  • the electrodes are formed of indium tin oxide (ITO), and in a reflexive LCD any one of the electrodes may be formed of a thin aluminum film.
  • ITO indium tin oxide
  • the two alignment films 35, formed on the first and second substrates 33 and 34 respectively, have a crossing angle of less than 45°, and the twist angle of the liquid crystal is likewise less than 45°.
  • an electrically controlled birefringence (ECB) mode is applicable.
  • Liquid crystal molecules adjacent to the alignment films form a pre-tilt angle (a) of less than 30°.
  • An LCD panel thus formed may adopt either a passive matrix or an active matrix drive method.
  • An active matrix LCD panel can use a plurality of transistors for switching pixels on and off. In that case, the semiconductor active regions may be formed of amorphous silicon for application in a transmissive LCD and of either monocrystalline or polycrystalline silicon for a projection LCD.
  • FIGS. 5 and 6 are cross-sectional views of an LCD panel according to the present invention having a vertically aligned liquid crystal layer.
  • FIG. 5 illustrates the alignment configuration of a liquid crystal layer when no voltage is applied;
  • FIG. 6 illustrates the alignment configuration of the liquid crystal layer when a voltage has been applied.
  • Liquid crystal molecules adjacent to the alignment films 35 form a pre- tilt angle of greater than 60°. Except for this pre-tilt angle, the configuration of the LCD panel illustrated in FIGS. 5 and 6 is identical to that of the LCD panel illustrated in FIGS. 3 and 4.
  • FIG. 7 is a graph showing the relationship between the thickness and response time of the liquid crystal layer according to the present invention.
  • the liquid crystal layer according to the present invention has a thickness range of 0.5 through 2.5 D and can be driven at 180 Hz with a response time of faster than 5 D at temperatures around 6O 0 C, which is the usual operating temperature range for projection LCDs. Reducing the thickness of the liquid crystal layer in favor of a faster response time, however, results in a lower transmittance. This problem can be solved by using a liquid crystal having a high refractive index anisotropy.
  • FIG. 8 is a graph showing the relationship between the twist angle and transmittance of the liquid crystal according to the present invention.
  • transmittance can be improved by reducing the twist angle of the liquid crystal. It can be noted that as far as the twist angle is less than 45°, the transmittance ratio remains greater than 95% with little variation. It is preferable, therefore, that the twist angle range of the liquid crystal is set between 0° and 45°. Decreasing the twist angle also results in a faster response time. In addition, the fact that transmittance variation caused by twist angle variance is small will lead to a higher manufacturing yield.
  • the transmittance of a liquid crystal is proportional to ⁇ n-d.
  • the liquid crystal used in order to maintain or increase the transmittance ratio while reducing the thickness (d) of the liquid crystal layer for a faster response time, the liquid crystal used must have a high refractive index anisotropy ( ⁇ n).
  • ⁇ n refractive index anisotropy
  • One remaining problem is the contrast deterioration associated with a low twist angle of the liquid crystal molecules in a horizontal alignment. With a twist angle of 90° the molecules adjacent to each substrate of the panel have a crossing angle of 90°, and thus their effect on the incident light is counterbalanced. With a much lower twist angle, however, such compensation effect is unavailable, and thus the contrast ratio is significantly lowered.
  • Application of a compensation film between the substrate and the polarizer may compensate for the change in birefringence caused by the director pattern near the substrate.
  • FIG. 9 is a schematic diagram illustrating the construction of a transmissive LCD according to an embodiment of the present invention.
  • the transmissive LCD includes an LCD panel and a light source 71.
  • the LCD panel comprises a pair of substrates coated with conductive transparent electrodes formed of indium tin oxide; alignment films 35 and a liquid crystal layer 36 formed between the first and second substrates 33 and 34; and a pair of polarizers 72 attached to the outer surface of the first and second substrates 33 and 34.
  • the light source 71 is a combination of diodes consisting either of red, green, and blue light sources or of red, green, blue, and white light sources.
  • a field sequential driving module (not shown) applies scan pulses to the gate circuit and sequential scan pulses to the data circuit.
  • the "color breaking" problem associated with prior field sequential color drive methods can be effectively controlled by subdividing the light- emitting interval of each color in two, three, or four.
  • FIG. 11 is a schematic diagram illustrating the construction of a projection LCD according to yet another embodiment of the present invention.
  • the projection LCD comprises a panel 92, a light source 71, and an optical engine.
  • the panel 92 has a pair of substrates coated with electrodes formed of a transparent conductive material such as indium tin oxide (not shown), on and between which a pair of alignment films and a liquid crystal layer are formed.
  • the optical engine may include a condenser lens system 91 for concentrating light on the panel and a set of mirrors 93 for guiding and redirecting the path of the projected image onto a screen 94.
  • FIG. 12 is a schematic diagram illustrating the construction of a projection LCD according to still another embodiment of the present invention.
  • the projection LCD comprises a panel, a light source 71, a field sequential drive module 112, and a color wheel 111.
  • the panel has a pair of substrates 33 and 34 coated with electrodes formed of a transparent conductive material such as indium tin oxide (not shown), on and between which a pair of alignment films 35 and a liquid crystal layer 36 are formed.
  • a couple of polarizers 32 are attached to the outer surfaces of the panel.
  • the light source 71 uses a white light such as a high-pressure mercury lamp.
  • the field sequential drive module 112 is connected to the color wheel and both substrates of the panel.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)

Abstract

La présente invention concerne un dispositif d'affichage à cristaux liquides caractérisé par un facteur de transmission et un temps de réaction améliorés. Un mode de réalisation de la présente invention comporte un écran à cristaux liquides nématiques comprenant une paire de substrats, sur lesquels un film d'alignement est formé et sur un desquels une pluralité de pixels sont disposés sous la forme d'une matrice; une source lumineuse située à proximité de l'écran; et un module d'entraînement séquentiel de champ en liaison électrique avec l'écran et la source lumineuse. La couche de cristaux liquides nématiques du mode de réalisation est caractérisée par une épaisseur réduite, un petit angle de torsion, et une anisotropie à indice de réfraction élevée. Les avantages de ce mode de réalisation comprennent: une efficacité optique améliorée due à l'adoption d'un procédé d'entraînement séquentiel de champ; un angle de visualisation plus large et un facteur de transmission plus élevé; une simplicité et un coût réduit de fabrication ainsi qu'un modèle plus compact découlant du fait qu'un moteur optique complexe n'est pas nécessaire; et une disponibilité d'une vue plus large exempte d'artéfacts de mouvement lors de la visualisation d'images vidéo.
PCT/KR2006/002693 2006-03-24 2006-07-10 Dispositif d'affichage à cristaux liquides Ceased WO2007111402A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2006-0027175 2006-03-24
KR1020060027175A KR20070096528A (ko) 2006-03-24 2006-03-24 액정 표시장치

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WO2007111402A1 true WO2007111402A1 (fr) 2007-10-04

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CN111095090A (zh) * 2017-09-08 2020-05-01 杜尔利塔斯有限公司 全息投影仪

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CN111095090A (zh) * 2017-09-08 2020-05-01 杜尔利塔斯有限公司 全息投影仪
JP2020533629A (ja) * 2017-09-08 2020-11-19 デュアリタス リミテッド ホログラフィックプロジェクタ
JP6994788B2 (ja) 2017-09-08 2022-01-14 デュアリタス リミテッド ホログラフィックプロジェクタ
US11372287B2 (en) 2017-09-08 2022-06-28 Dualitas Ltd Holographic projector

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