CN112764280A - Liquid crystal holographic display screen capable of simultaneously realizing amplitude and phase modulation - Google Patents

Liquid crystal holographic display screen capable of simultaneously realizing amplitude and phase modulation Download PDF

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Publication number
CN112764280A
CN112764280A CN202110063598.9A CN202110063598A CN112764280A CN 112764280 A CN112764280 A CN 112764280A CN 202110063598 A CN202110063598 A CN 202110063598A CN 112764280 A CN112764280 A CN 112764280A
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liquid crystal
circularly polarized
handed circularly
polarized light
crystal molecules
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刘毅
尹韶云
吕咏墨
栗鹏
李哲
陈建军
江海波
孙秀辉
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Chongqing University
Chongqing Institute of Green and Intelligent Technology of CAS
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Chongqing University
Chongqing Institute of Green and Intelligent Technology of CAS
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    • 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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H2001/0208—Individual components other than the hologram
    • G03H2001/0224—Active addressable light modulator, i.e. Spatial Light Modulator [SLM]
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00—Active addressable light modulator
    • G03H2225/30—Modulation
    • G03H2225/33—Complex modulation
    • G03H2225/34—Amplitude and phase coupled modulation

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention relates to a liquid crystal holographic display screen capable of simultaneously realizing amplitude and phase modulation, belonging to the field of electronic devices. The display screen includes Cell1 and Cell 2; cell1 includes: the liquid crystal display panel comprises a pixel electrode I, a common electrode I, liquid crystal molecules I and a control electrode I; cell2 includes: a second pixel electrode, a second common electrode, a second liquid crystal molecule and a second control electrode; cell1 and Cell2 are adjacent; the liquid crystal display panel is sequentially arranged into a first common electrode, a first pixel electrode, a first liquid crystal molecule, a first control electrode, a second common electrode, a second pixel electrode, a second liquid crystal molecule and a second control electrode; the first liquid crystal molecule is parallel or vertical to the first pixel electrode; the first liquid crystal molecules and the second liquid crystal molecules are vertical to each other. The pixel electrode controls the liquid crystal molecules to rotate in the plane, so that the phase of incident light can be modulated, the control electrode controls the liquid crystal molecules to rotate vertically, the intensity of the incident light can be modulated, and when the two are matched, the dual modulation of the phase and the intensity can be realized.

Description

Liquid crystal holographic display screen capable of simultaneously realizing amplitude and phase modulation
Technical Field
The invention belongs to the field of electronic devices, and relates to a liquid crystal holographic display screen capable of realizing amplitude and phase modulation simultaneously.
Background
Liquid crystal has the advantages of low modulation voltage, high efficiency and the like as an electro-optic material of a phase-type spatial light modulator, is widely applied to holographic display, and the most common working mode is Electric Controlled Birefringence (ECB). However, to achieve a phase modulation capability of 2 pi, the liquid crystal thickness of the conventional structure reaches at least one complete wave plate. The thicker liquid crystal layer limits the increase of the modulation speed, and also prevents the size of the phase modulation pixel unit from being further reduced, thereby limiting the observation visual angle of the displayed holographic image. Meanwhile, the structure can only carry out phase modulation and cannot modulate amplitude.
The invention relates to a double-box fringe field switching liquid crystal holographic display with a three-layer electrode structure, belonging to the field of optical systems and device design.
Holographic display adopts a Spatial Light Modulator (SLM) to generate Light wave front required by display, and the prior SLM can be divided into two types according to different principles: one is to modulate the amplitude of light, a typical device is a digital micro-mirror (DMD), and this SLM loses a large amount of light energy for holographic display, which is inefficient; another method is to modulate the phase of light, such as LCOS, to change the phase of incident light using electro-optic effect, which is energy efficient.
In a conventional phase modulation type liquid crystal device, such as LCOS, liquid crystal molecules generally operate in the following modes: in an electric fieldUnder the action of the liquid crystal, the orientation of the liquid crystal is continuously deflected from the direction parallel to the surface of the device to the direction vertical to the surface of the device, so that the effective refractive index sensed by incident linearly polarized light is gradually reduced, when the liquid crystal is parallel to the surface of the device, the effective refractive index is ne, and when the liquid crystal is vertical to the surface of the device, the sensed refractive index is no, therefore, the phase modulation range of the device is within the range
Figure BDA0002903599420000011
Where k0 is the wavevector of the incident light in vacuum and d is the thickness of the liquid crystal. Since holographic displays generally require phase modulation capability up to 2 π, the liquid crystal thickness needs to satisfy:
k0·(ne-n0)·d≥2π
i.e. the liquid crystal thickness reaches at least one complete wave plate.
Traditional liquid crystal phase holography needs a thick liquid crystal layer, not only is unfavorable for the improvement of modulation speed, but also enables the size of a phase modulation pixel unit to be further reduced, and limits the observation visual angle of a displayed holographic image. Meanwhile, the structure can only carry out phase modulation and cannot modulate amplitude.
The Geometric Phase is also called as a PB Phase, and is a Phase retardation generated by the change of the polarization state when light propagates in an anisotropic medium, and the modulation size of GP is determined by the optical axis of the wave plate regardless of the wavelength of incident light and the thickness of the medium. When a beam of incident light (left-handed circularly polarized light or right-handed circularly polarized light, respectively, with | L>And | R>Shows) incident into an in-plane rotating liquid crystal alignment device (liquid crystal thickness d, molecular director makes an angle α with the x-axis), the emerging light will simultaneously contain | L>And | R>And (4) components. Assuming that the incident light is a complete left-handed circularly polarized light, its emergent light | L>、|R>Respectively, complex amplitudes of betaLAnd betaRNamely:
|Eout>＝βL|L>+βR|R> (1)
using the jones matrix, after passing through the liquid crystal:
Figure BDA0002903599420000021
Figure BDA0002903599420000022
(2) and (3) in the two formulas, phie＝neD and Φo＝noD, as can be seen from the equation (3), the left-handed circularly polarized light enters the liquid crystal wave plate, and the emergent right-handed circularly polarized light has a phase retardation term of 2 α, which is the PB phase. It can be seen that the optical axis direction of the rotating liquid crystal wave plate can modulate the magnitude of the PB phase, and the amount of modulation is independent of the incident light wavelength. The thickness of the liquid crystal determines | L in the emergent light>And | R>Magnitude of component amplitude when phie-ΦoWhen the refractive index is pi, the emergent light only has a right-handed circular polarization component, and the liquid crystal with the thickness is equivalent to a half-wave plate, so that the thickness is reduced by half compared with the traditional refractive index modulation method. In response thereto, the right angle of incidence and phie-ΦoWhen pi, all are converted to levorotatory light, the phase retardation of obtained PB is-2 α.
When the positive liquid crystal is driven by pressurization, the liquid crystal director rotates along the direction parallel to the electric field lines, the liquid crystal director is finally parallel to the electric field lines along with the increase of voltage, the maximum rotation range of the liquid crystal director does not exceed 90 degrees, and therefore the phase modulation range of one liquid crystal box does not exceed 180 degrees at most. In order to realize 360-degree phase modulation and intensity modulation, a double-box fringe field switching liquid crystal structure design with a three-layer electrode structure is adopted. The levorotatory circular polarized light sequentially passes through two liquid crystal boxes (each liquid crystal box is equivalent to a half-wave plate), the levorotatory circular polarized light is completely changed into right-handed circular polarized light after passing through the first liquid crystal box, and GP generated is 2 alpha1(ii) a Then passes through a second liquid crystal box to be thick and completely changed into the left-handed polarized light, and GP generated is-2 alpha2After passing through two liquid crystal cells, the total GP size is: psi 2 alpha1-2α2When the first liquid crystal box only controls the in-plane rotation of the liquid crystal molecules, the second liquid crystal box controls the horizontal rotation of the liquid crystal molecules and the vertical rotation of the liquid crystal molecules at the same time, and the dual control of the amplitude and the phase of the liquid crystal device can be realized.
Disclosure of Invention
In view of the above, the present invention provides a liquid crystal holographic display panel capable of simultaneously realizing amplitude and phase modulation.
In order to achieve the purpose, the invention provides the following technical scheme:
a liquid crystal holographic display screen capable of realizing amplitude and phase modulation simultaneously comprises a Cell1 and a Cell 2;
cell1 includes: the liquid crystal display panel comprises a pixel electrode I, a common electrode I, liquid crystal molecules I and a control electrode I;
cell2 includes: a second pixel electrode, a second common electrode, a second liquid crystal molecule and a second control electrode;
cell1 and Cell2 are adjacent;
the liquid crystal display panel is sequentially arranged into a first common electrode, a first pixel electrode, a first liquid crystal molecule, a first control electrode, a second common electrode, a second pixel electrode, a second liquid crystal molecule and a second control electrode;
the first liquid crystal molecule is parallel or vertical to the first pixel electrode;
the first liquid crystal molecules and the second liquid crystal molecules are vertical to each other.
Optionally, when the Cell1 pixel electrode is driven, the Cell2 is in an original state, the Cell1 liquid crystal molecules rotate 90 ° in the plane, the Cell2 liquid crystal molecules remain in the original state, after a beam of left-handed circularly polarized light enters the system and passes through the Cell1, the left-handed circularly polarized light changes into right-handed circularly polarized light due to the rotation of the liquid crystal molecules 90 °, the phase changes by 180 °, and the right-handed circularly polarized light changes into left-handed circularly polarized light due to the fact that the liquid crystal molecules do not rotate and the phase does not change when passing through the Cell 2;
when the Cell1 is in the original state, the Cell2 pixel electrode is in the driving state, the Cell1 liquid crystal molecules are kept in the original state, the Cell2 liquid crystal molecules rotate 90 degrees, after a beam of left-handed circularly polarized light enters the system, the left-handed circularly polarized light is changed into right-handed circularly polarized light after passing through the Cell1, the liquid crystal molecules are not changed, the phase is not changed, the right-handed circularly polarized light is changed into left-handed circularly polarized light after passing through the Cell2, the Cell2 is driven under pressure, the liquid crystal molecules rotate 90 degrees, the phase of the emergent left-handed circularly polarized light is changed into-180 degrees, and the phase is changed from-;
the same result is obtained when the incident light is right-handed circularly polarized.
Optionally, when the Cell1 pixel electrodes are driven, the Cell2 control electrodes are driven, the Cell1 liquid crystal molecules rotate 90 degrees in plane, the optical axis of the Cell2 liquid crystal molecules is kept unchanged, and the effective birefringence is reduced;
after a beam of left-handed circularly polarized light enters the system, the left-handed circularly polarized light is changed into right-handed circularly polarized light after passing through the Cell1, the phase changes by 180 degrees, when passing through the Cell2, liquid crystal molecules do not rotate in the plane, the right-handed circularly polarized light is changed into left-handed circularly polarized light, the phase does not change, the liquid crystal molecules rotate up and down, the effective birefringence of the liquid crystal molecules is reduced, and the emergent light intensity is modulated;
when the Cell1 control electrodes are driven, Cell2 pixel electrodes are in a driving state, Cell1 liquid crystal molecules rotate up and down, the optical axis does not change, Cell2 liquid crystal molecules rotate 90 degrees, after a left-handed circularly polarized light enters a system, the left-handed circularly polarized light is changed into right-handed circularly polarized light after passing through the Cell1, the optical axis of the liquid crystal molecules does not change, the phase does not change, the effective birefringence of the liquid crystal is reduced, the light intensity is reduced, when the left-handed circularly polarized light passes through the Cell2, the right-handed circularly polarized light is changed into left-handed circularly polarized light, the Cell2 is driven in a pressurizing mode, the liquid crystal molecules rotate 90 degrees;
the same result is obtained when the incident light is right-handed circularly polarized.
The invention has the beneficial effects that:
the invention provides a liquid crystal display device structure based on a PB phase adjustable phase and amplitude, which adopts a double-Cell fringe field switching liquid crystal display mode of a three-layer electrode structure and comprises cells 1 and cells 2, wherein each Cell comprises: the liquid crystal display comprises a pixel electrode, a common electrode, liquid crystal molecules and a control electrode; the double-box arrangement is adopted, the double boxes are arranged in parallel, the pixel electrode controls the liquid crystal molecules to rotate in the plane, the incident light phase can be modulated, the control electrode controls the liquid crystal molecules to rotate vertically, the incident light intensity can be modulated, and when the two are matched, the double modulation of the phase and the intensity can be realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of phase control; (a) is a schematic diagram of the phase not changing; (b) the schematic diagram of the phase change from-180 degrees to 180 degrees is realized;
FIG. 2 is a schematic diagram of phase + amplitude control; (a) the emergent light intensity is modulated; (b) the phase change of the outgoing levorotatory circular polarized light is-180 degrees.
Reference numerals: 1-Cell1, 2-Cell2, 11-pixel electrode one, 21-common electrode one, 31-liquid crystal molecule one, 41-control electrode one, 12-pixel electrode two, 22-common electrode two, 32-liquid crystal molecule two, 42-control electrode two.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The structure of the invention is shown in fig. 1 and fig. 2, and comprises a Cell11 and a Cell 22;
cell1 includes: the liquid crystal display panel comprises a pixel electrode I11, a common electrode I21, liquid crystal molecules I31 and a control electrode I41;
cell2 includes: a second pixel electrode 12, a second common electrode 22, a second liquid crystal molecule 32 and a second control electrode 42;
cell1 and Cell2 are adjacent;
the liquid crystal display panel is sequentially arranged into a first common electrode, a first pixel electrode, a first liquid crystal molecule, a first control electrode, a second common electrode, a second pixel electrode, a second liquid crystal molecule and a second control electrode;
the first liquid crystal molecule is parallel or vertical to the first pixel electrode;
the first liquid crystal molecules and the second liquid crystal molecules are vertical to each other.
When the Cell1 pixel electrodes are driven, the Cell2 is in the original state, the Cell1 liquid crystal molecules rotate 90 degrees in the plane, the Cell2 liquid crystal molecules keep the original state, after a beam of left-handed circularly polarized light enters the system and passes through the Cell1, the left-handed circularly polarized light is changed into right-handed circularly polarized light due to the fact that the liquid crystal molecules rotate 90 degrees, the phase is changed by 180 degrees, and the right-handed circularly polarized light is changed into left-handed circularly polarized light when passing through the Cell2, and the phase is not changed due to the fact that the liquid crystal molecules do not rotate, as shown. When the Cell1 is in the original state, the Cell2 pixel electrodes are in the driving state, the Cell1 liquid crystal molecules are kept in the original state, the Cell2 liquid crystal molecules rotate 90 degrees, after a left-handed circularly polarized light enters the system, the left-handed circularly polarized light is changed into right-handed circularly polarized light after passing through the Cell1, the phase is unchanged because the liquid crystal molecules are not changed, the right-handed circularly polarized light is changed into left-handed circularly polarized light when passing through the Cell2, the liquid crystal molecules rotate 90 degrees due to pressurization driving of the Cell2, the phase of the emergent left-handed circularly polarized light is changed into-180 degrees, and as shown in fig. 1(b), the phase of the whole system can be changed from-180 degrees to 180 degrees. The same result can be obtained when the incident light is right-handed circularly polarized.
When the Cell1 pixel electrodes are driven, the Cell2 control electrode driving, the Cell1 liquid crystal molecules rotate 90 degrees in plane, the Cell2 liquid crystal molecule optical axis remains unchanged, but the effective birefringence is reduced. When a beam of left-handed circularly polarized light enters the system, the left-handed circularly polarized light is changed into right-handed circularly polarized light after passing through the Cell1, the phase changes by 180 degrees, and when the beam passes through the Cell2, the right-handed circularly polarized light is changed into left-handed circularly polarized light without changing the phase because the liquid crystal molecules do not rotate in the plane, but the effective birefringence of the liquid crystal molecules is reduced because the liquid crystal molecules rotate up and down, and the emergent light intensity is modulated, as shown in fig. 2 (a). When the Cell1 control electrodes are driven, the Cell2 pixel electrodes are in a driving state, Cell1 liquid crystal molecules rotate up and down, but the optical axis does not change, the Cell2 liquid crystal molecules rotate 90 degrees, after a left-handed circularly polarized light enters the system, the left-handed circularly polarized light is changed into right-handed circularly polarized light after passing through the Cell1, the phase does not change because the optical axis of the liquid crystal molecules does not change, but the right-handed circularly polarized light is changed into left-handed circularly polarized light because the effective birefringence of the liquid crystal is reduced, the light intensity is reduced, the right-handed circularly polarized light passes through the Cell2, and the phase of the outgoing left-handed circularly polarized light is changed to-180 degrees because the Cell2 is driven by pressurization, as. The scheme realizes phase change from-180 degrees to 180 degrees and simultaneously realizes intensity control. The same result can be obtained when the incident light is right-handed circularly polarized.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (3)

1. A liquid crystal holographic display screen capable of realizing amplitude and phase modulation simultaneously is characterized in that: including Cell1 and Cell 2;
cell1 includes: the liquid crystal display panel comprises a pixel electrode I, a common electrode I, liquid crystal molecules I and a control electrode I;
cell2 includes: a second pixel electrode, a second common electrode, a second liquid crystal molecule and a second control electrode;
cell1 and Cell2 are adjacent;
the liquid crystal display panel is sequentially arranged into a first common electrode, a first pixel electrode, a first liquid crystal molecule, a first control electrode, a second common electrode, a second pixel electrode, a second liquid crystal molecule and a second control electrode;
the first liquid crystal molecule is parallel or vertical to the first pixel electrode;
the first liquid crystal molecules and the second liquid crystal molecules are vertical to each other.
2. The holographic liquid crystal display capable of realizing amplitude and phase modulation simultaneously as claimed in claim 1, wherein: when the Cell1 pixel electrode is driven, the Cell2 is in the original state, the Cell1 liquid crystal molecules rotate 90 degrees in the plane, the Cell2 liquid crystal molecules keep the original state, after a beam of left-handed circularly polarized light enters the system and passes through the Cell1, the left-handed circularly polarized light is changed into right-handed circularly polarized light due to the fact that the liquid crystal molecules rotate 90 degrees, the phase is changed by 180 degrees, and the right-handed circularly polarized light is changed into left-handed circularly polarized light due to the fact that the liquid crystal molecules do not rotate, and the phase is not changed;
when the Cell1 is in the original state, the Cell2 pixel electrode is in the driving state, the Cell1 liquid crystal molecules are kept in the original state, the Cell2 liquid crystal molecules rotate 90 degrees, after a beam of left-handed circularly polarized light enters the system, the left-handed circularly polarized light is changed into right-handed circularly polarized light after passing through the Cell1, the liquid crystal molecules are not changed, the phase is not changed, the right-handed circularly polarized light is changed into left-handed circularly polarized light after passing through the Cell2, the Cell2 is driven under pressure, the liquid crystal molecules rotate 90 degrees, the phase of the emergent left-handed circularly polarized light is changed into-180 degrees, and the phase is changed from-;
the same result is obtained when the incident light is right-handed circularly polarized.
3. The holographic liquid crystal display capable of realizing amplitude and phase modulation simultaneously as claimed in claim 1, wherein: when the Cell1 pixel electrodes are driven, the Cell2 control electrodes are driven, the Cell1 liquid crystal molecules rotate 90 degrees in plane, the optical axis of the Cell2 liquid crystal molecules is kept unchanged, and the effective birefringence is reduced;
after a beam of left-handed circularly polarized light enters the system, the left-handed circularly polarized light is changed into right-handed circularly polarized light after passing through the Cell1, the phase changes by 180 degrees, when passing through the Cell2, liquid crystal molecules do not rotate in the plane, the right-handed circularly polarized light is changed into left-handed circularly polarized light, the phase does not change, the liquid crystal molecules rotate up and down, the effective birefringence of the liquid crystal molecules is reduced, and the emergent light intensity is modulated;
when the Cell1 control electrodes are driven, Cell2 pixel electrodes are in a driving state, Cell1 liquid crystal molecules rotate up and down, the optical axis does not change, Cell2 liquid crystal molecules rotate 90 degrees, after a left-handed circularly polarized light enters a system, the left-handed circularly polarized light is changed into right-handed circularly polarized light after passing through the Cell1, the optical axis of the liquid crystal molecules does not change, the phase does not change, the effective birefringence of the liquid crystal is reduced, the light intensity is reduced, when the left-handed circularly polarized light passes through the Cell2, the right-handed circularly polarized light is changed into left-handed circularly polarized light, the Cell2 is driven in a pressurizing mode, the liquid crystal molecules rotate 90 degrees;
the same result is obtained when the incident light is right-handed circularly polarized.
CN202110063598.9A 2021-01-18 2021-01-18 Liquid crystal holographic display screen capable of simultaneously realizing amplitude and phase modulation Pending CN112764280A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113534556A (en) * 2021-06-16 2021-10-22 西安中科微星光电科技有限公司 Amplitude and phase independent controllable liquid crystal light valve
CN114077076A (en) * 2021-11-25 2022-02-22 京东方科技集团股份有限公司 Display module and display device
CN114326354A (en) * 2022-01-13 2022-04-12 京东方科技集团股份有限公司 Display panel, display device and display method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113534556A (en) * 2021-06-16 2021-10-22 西安中科微星光电科技有限公司 Amplitude and phase independent controllable liquid crystal light valve
CN114077076A (en) * 2021-11-25 2022-02-22 京东方科技集团股份有限公司 Display module and display device
CN114326354A (en) * 2022-01-13 2022-04-12 京东方科技集团股份有限公司 Display panel, display device and display method
CN114326354B (en) * 2022-01-13 2024-01-16 京东方科技集团股份有限公司 Display panel, display device and display method

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