CN117518566A - Electric control optical screen - Google Patents
Electric control optical screen Download PDFInfo
- Publication number
- CN117518566A CN117518566A CN202211173446.5A CN202211173446A CN117518566A CN 117518566 A CN117518566 A CN 117518566A CN 202211173446 A CN202211173446 A CN 202211173446A CN 117518566 A CN117518566 A CN 117518566A
- Authority
- CN
- China
- Prior art keywords
- wave plate
- layer
- electrically controlled
- polarizing layer
- screen
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 155
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 claims abstract description 50
- 238000005034 decoration Methods 0.000 claims abstract description 36
- 230000031700 light absorption Effects 0.000 claims abstract description 32
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 30
- HVYWMOMLDIMFJA-DPAQBDIFSA-N cholesterol Chemical compound C1C=C2C[C@@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2 HVYWMOMLDIMFJA-DPAQBDIFSA-N 0.000 claims abstract description 18
- 235000012000 cholesterol Nutrition 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims description 29
- 210000002858 crystal cell Anatomy 0.000 claims description 8
- 239000010410 layer Substances 0.000 description 151
- 238000010586 diagram Methods 0.000 description 21
- 230000010287 polarization Effects 0.000 description 19
- 239000002344 surface layer Substances 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 206010049155 Visual brightness Diseases 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 230000035807 sensation Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133562—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the viewer side
-
- 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
- G02F1/13718—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 a change of the texture state of a cholesteric liquid crystal
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
Abstract
An electrically controlled optical screen comprises a switchable diffusing element and an electrically controlled decoration module. The switchable scattering element is arranged on one side of the electric control decoration module and is used for switching between a scattering state and a transparent state. The electric control decoration module comprises a first polarizing layer, a first 1/4 wave plate, a cholesterol liquid crystal layer, an electric control wave plate, a second 1/4 wave plate and a second polarizing layer which are sequentially laminated. The electrically controlled wave plate is provided with a liquid crystal layer. The second polarizing layer is arranged between the switchable scattering element and the second 1/4 wave plate. The cholesteric liquid crystal layer is used for reflecting one of left-handed circularly polarized light or right-handed circularly polarized light. The light absorption axis of the first polarizing layer is perpendicular to the light absorption axis of the second polarizing layer, the optical axis of the first 1/4 wave plate is parallel to the optical axis of the second 1/4 wave plate, or the light absorption axis of the first polarizing layer is parallel to the light absorption axis of the second polarizing layer, and the optical axis of the first 1/4 wave plate is perpendicular to the optical axis of the second 1/4 wave plate. The image light projected onto the electronically controlled optical screen can produce an image with high contrast.
Description
Technical Field
The present invention relates to an optical device, and more particularly, to an electrically controlled optical screen.
Background
The known projection device projects an image beam onto a projection screen (projection screen), and the image beam is scattered by the projection screen and then enters the human eye, so that the human eye can see the image. The projection screen is not limited to a common projection screen, but may be, for example, a glass shop window or an advertisement board. Furthermore, the optical representation of the projection screen may be presented electronically, in particular by electronically controlled scattering elements. The electrically controlled scattering element is switchable between a scattering state and a transparent state, for example, using Polymer-dispersed Liquid Crystal (PDLC) technology. However, the electrically controlled scattering element cannot shield the light, and if the non-projection side is a bright environment, there is a problem of poor image contrast.
The background section is only for the purpose of aiding in the understanding of the present invention and thus the disclosure of the background section may include some techniques that do not form part of the knowledge of one of ordinary skill in the art. The disclosure of the "background" section is not intended to represent the subject matter or problem underlying one or more embodiments of the present invention, as it would be known or appreciated by one of ordinary skill in the art prior to the application of the present invention.
Disclosure of Invention
The invention provides an electric control optical screen, which is provided with an electric control scattering element and an electric control decoration module, wherein the electric control decoration module can shield light on the non-projection side of the electric control scattering element, and image light projected to the electric control optical screen can generate images with high contrast.
Other objects and advantages of the present invention will be further appreciated from the technical features disclosed in the present invention.
To achieve one or a part or all of the above or other objects, according to one embodiment of the present invention, an electrically controlled optical screen is provided, which includes a switchable diffuser element and an electrically controlled decoration module. Electronically controlled optical screens are used to switch between different optical modes. The switchable scattering element is arranged on one side of the electric control decoration module and is used for switching between a scattering state and a transparent state. The electric control decoration module comprises a first polarizing layer, a first 1/4 wave plate, a cholesterol liquid crystal layer, an electric control wave plate, a second 1/4 wave plate and a second polarizing layer which are sequentially laminated. The electrically controlled wave plate is provided with a liquid crystal layer. The second polarizing layer is arranged between the switchable scattering element and the second 1/4 wave plate. The cholesteric liquid crystal layer is used for reflecting one of left-handed circularly polarized light or right-handed circularly polarized light. Wherein the light absorption axis of the first polarizing layer is perpendicular to the light absorption axis of the second polarizing layer. The optical axis of the first 1/4 wave plate is parallel to the optical axis of the second 1/4 wave plate, or the light absorption axis of the first polarizing layer is parallel to the light absorption axis of the second polarizing layer, and the optical axis of the first 1/4 wave plate is perpendicular to the optical axis of the second 1/4 wave plate.
According to an embodiment of the present invention, there is provided an electrically controlled optical screen including a scattering element and an electrically controlled decoration module. Electronically controlled optical screens are used to switch between different optical modes. The scattering element is arranged on one side of the electric control decoration module. The electric control decoration module comprises a first polarizing layer, a first 1/4 wave plate, a cholesterol liquid crystal layer, an electric control wave plate, a second 1/4 wave plate and a second polarizing layer which are sequentially laminated. The first polarizing layer is arranged between the scattering element and the first 1/4 wave plate, and the cholesterol liquid crystal layer is used for reflecting one of the left-handed circularly polarized light or the right-handed circularly polarized light. The light absorption axis of the first polarizing layer is perpendicular to the light absorption axis of the second polarizing layer, the optical axis of the first 1/4 wave plate is parallel to the optical axis of the second 1/4 wave plate, or the light absorption axis of the first polarizing layer is parallel to the light absorption axis of the second polarizing layer, and the optical axis of the first 1/4 wave plate is perpendicular to the optical axis of the second 1/4 wave plate.
Based on the above, the electrically controlled optical screen provided by the embodiment of the invention is provided with the electrically controlled scattering element and the electrically controlled decoration module, and is used for switching between different optical modes. More specifically, the switchable scattering element can be switched between a scattering state and a transparent state, and can be matched with an electric control wave plate in the electric control decoration module to generate a plurality of optical modes. The various optical modes provide different visual sensations to the user.
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic view of an electronically controlled optical screen according to an embodiment of the present invention.
Fig. 2A is a schematic diagram of an optical mechanism of an electronically controlled optical screen in a projection mode according to an embodiment of the present invention.
Fig. 2B is a schematic diagram of an electronically controlled optical screen in accordance with an embodiment of the present invention.
Fig. 2C is a schematic diagram of an electronically controlled optical screen in accordance with an embodiment of the present invention.
Fig. 2D is a schematic view of a projection apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an optical mechanism of an electronically controlled optical screen in a decoration mode according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of an optical mechanism of an electronically controlled optical screen in a transparent mode according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an optical mechanism of the electronically controlled optical screen in a lighting mode according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of an optical mechanism of an electronically controlled optical screen in a projection mode according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of an electronically controlled optical screen in accordance with an embodiment of the present invention.
Fig. 8 is a schematic diagram of an optical mechanism of an electronically controlled optical screen in a projection mode according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of an optical mechanism of an electronically controlled optical screen in a decoration mode according to an embodiment of the present invention.
Detailed Description
The foregoing and other features, aspects and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiment, which proceeds with reference to the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, the directional terminology is used for purposes of illustration and is not intended to be limiting of the invention.
Referring to fig. 1, an electronically controlled optical screen according to an embodiment of the invention is shown. The electronically controlled optical screen 10A includes a switchable diffusing element 200 and an electronically controlled decorative module 100. The switchable diffuser 200 is disposed on one side of the electrically controlled decoration module 100, and the side is a projection side of the electrically controlled optical screen 10A, and is configured to receive the image beam. The switchable scattering element 200 may be controlled to switch between a scattering state and a transparent state. The electrically controlled decoration module 100 includes a first polarizing layer P1, a first 1/4 wave plate Q1, a cholesteric liquid crystal layer 102, an electrically controlled wave plate 101, a second 1/4 wave plate Q2, and a second polarizing layer P2, which are sequentially stacked. The electronically controlled wave plate 101 is provided with a liquid crystal layer. The second polarizing layer P2 is disposed between the switchable scattering element 200 and the second 1/4 wave plate Q2. The light absorption axis of the first polarizing layer P1 is perpendicular to the light absorption axis of the second polarizing layer P2. In this embodiment, the light absorption axis of the first polarizing layer P1 is parallel to the X direction, and the light absorption axis of the second polarizing layer P2 is parallel to the Z direction. The optical axis of the first 1/4 wave plate Q1 is parallel to the optical axis of the second 1/4 wave plate Q2. The cholesteric liquid crystal layer 102 is for reflecting one of left-handed circularly polarized light or right-handed circularly polarized light.
The first 1/4 wave plate Q1 and the second 1/4 wave plate Q2 may be made of, for example, a material having a positive dispersion (Normal wavelength dispersion) or a reverse dispersion (Inverse wavelength dispersion) characteristic, and preferably a material having a reverse dispersion characteristic is used. The cholesteric liquid crystal layer 102 is provided with cholesteric liquid crystal (Cholesteric liquid crystal) and may have a decorative pattern, such as wood grain. Specifically, the cholesteric liquid crystal is a liquid crystal molecule having bragg reflection and bistable properties, which can reflect incident light having the same wavelength as the pitch and the same optical rotation, and can be switched to a reflective state (planar state) or a transmissive state (focal-constant state) under the driving of an applied electric field. The cholesterol liquid crystal reflects light with specific wavelength in the reflection state, so that the corresponding decoration pattern is presented; in the penetrating state, the light is transmitted without showing the decorative pattern. For ease of understanding, in the embodiments of the present invention depicted in fig. 1-9, the cholesteric liquid crystal layer 102 is configured to reflect left-handed circularly polarized light, which then penetrates the cholesteric liquid crystal layer 102.
In some embodiments, the switchable scattering element 200 comprises a liquid crystal layer. The liquid crystal molecules in the liquid crystal layer are, for example, polymer Dispersed Liquid Crystal (PDLC), polymer network liquid crystal (Polymer Network Liquid Crystal, PNLC), or multistable liquid crystal (Multi Stable Liquid Crystal, MSLC), so that the switchable scattering element 200 can be switched between a scattering state (fog state) and a transparent state.
The electronically controlled waveplate 101 may be a liquid crystal cell employing vertical alignment (Vertical Alignment, VA) technology, electronically controlled birefringence (Electrically controlled birefringence, ECB) technology, or In-Plane Switching (IPS) technology. For the embodiment using vertical alignment (Vertical Alignment, VA) techniques, the electronically controlled waveplate 101 can be switched between a half-waveplate state and a phase retardation free state by applying or not applying a voltage. Based on the structure and technology of the switchable diffusing element 200 and the electronically controlled waveplate 101 described above, the electronically controlled optical screen 10A may be switched between different optical modes as will be described below. The electronically controlled optical screen 10A is switchable between a projection mode, a decoration mode, a transparent mode, and a lighting mode, for example, as described in detail below.
Referring to fig. 1, 2A and 2D simultaneously. Fig. 2D is a schematic diagram of a projection apparatus according to some embodiments of the present invention, and fig. 2A is a schematic diagram of an optical mechanism of the electro-optic screen 10A of fig. 1 in a projection mode. In the present embodiment, the projection system 1 includes an electronically controlled optical screen 10A, a projection device 20, and a mirror 30. The projection device 20 is used for providing image light 20I. After the image light 20I projected from the projection device 20 is reflected by the mirror 30, the image light 20I is projected onto the electro-optic screen 10A, in this embodiment, the projection device 20 and the electro-optic screen 10A are disposed on the same side of the mirror 30, and the image light 20I is incident from the projection side of the electro-optic screen 10A. Wherein the mirror 30 may be, for example, a mirror configured independently or a mirror configured within the same housing as the projection device.
In various embodiments of the present invention, the image light 20I is configured to be obliquely incident on the electro-optic screen 10A (or the electro-optic screens 10B to 10E, which will be described in other embodiments), as shown in fig. 2D. Specifically, the image light 20I is emitted from the projection device 20 and then reflected by the mirror 30 to the electro-optic optical screen 10A. There is a gap between the image light 20I and the projection device 20 between the mirror 30 and the electro-optic screen 10A, the gap is limited by an Offset (Offset), if the Offset (Offset) is too small, the image light 20I interferes with the lens of the projection device 20, wherein the Offset is (h+h ') x 100%/h, where h' is a perpendicular distance between the lower edge of the projected image on the electro-optic screen 10A and an extension line of the optical axis OA of the projection device 20, and h is a length of the projected image on the electro-optic screen 10A in a direction perpendicular to the extension line of the optical axis OA. Preferably, the offset should be greater than or equal to 120%.
In the present embodiment, when the electro-optic screen 10A is switched to the projection mode, the switchable scattering element 200 disposed on the projection side of the electro-optic screen 10A is configured to be in a scattering state, and the electro-optic wave plate 101 is configured as a half wave plate (half wave plate state).
When the image light 20I from the projection device 20 enters the switchable diffuser 200 from the projection side of the electro-optic screen 10A, a portion of the image light 20I is reflected and scattered to form a projected image that is seen by a human eye located at the projection side. The other part of the image light 20I is transmitted and scattered, and then sequentially passes through the second polarizing layer P2, the second 1/4 wave plate Q2, the electrically controlled wave plate 101, and the cholesteric liquid crystal layer 102. Since most of the image light 20I is incident on the cholesteric liquid crystal layer 102 obliquely, and the reflection spectrum of the cholesteric liquid crystal layer 102 is shifted toward the short wavelength (i.e. blue band) for the image light incident on the cholesteric liquid crystal layer 102 obliquely, the reflectivity is greatly reduced, so that most of the light can penetrate the cholesteric liquid crystal layer 102 and be absorbed by the first polarizing layer P1.
Next, the influence of the electro-optic screen 10A on the ambient light C1 from the projection side and the ambient light C2 from the non-projection side of the electro-optic screen 10A will be described in detail, wherein the projection side of the electro-optic screen 10A is the side of the electro-optic screen 10A receiving the image light, and the non-projection side of the electro-optic screen 10A is the other side opposite to the projection side.
The electro-optic optical screen 10A is in a projection mode, and ambient light C1 from the projection side travels toward the switchable diffuser element 200, and a portion of the ambient light C1 penetrates the switchable diffuser element 200 and is scattered by the switchable diffuser element 200. Another portion of the ambient light C1 is scattered and reflected by the surface of the switchable scattering element 200, wherein the portion of the ambient light C1 that has penetrated the switchable scattering element 200 forms linear polarization in the X direction after penetrating the second polarization layer P2. After penetrating the second 1/4 wave plate Q2, the ambient light C1 is formed as right-hand circularly polarized light, and after penetrating the electronically controlled wave plate 101 (configured as a half wave plate), is formed as left-hand circularly polarized light C1. When the left-handed circularly polarized light C1 enters the cholesteric liquid crystal layer 102, a part of the left-handed circularly polarized light C1 is reflected by the cholesteric liquid crystal layer 102 to form ambient light C11, and another part of the left-handed circularly polarized light C1 penetrates the cholesteric liquid crystal layer 102 because its wavelength is deviated from the dominant wavelength (dominant wavelength) corresponding to the cholesteric liquid crystal molecules. After passing through the first 1/4 wave plate Q1, the ambient light C1 passing through the cholesteric liquid crystal layer 102 is formed as linear polarized light in the X direction and is absorbed by the first polarizing layer P1.
After being reflected by the cholesteric liquid crystal layer 102, the ambient light C11 is formed into right-handed circularly polarized light C11 after penetrating the electronically controlled wave plate 101 (configured as a half-wave plate). After penetrating the second 1/4 wave plate Q2, the ambient light C11 reflected by the cholesteric liquid crystal layer 102 is formed as X-direction linear polarized light and penetrates the second polarizing layer P2. Finally, the ambient light C11 is scattered by the switchable scattering element 200. The brightness of the ambient light C11 is now much reduced compared to the initial brightness of the ambient light C1.
The ambient light C2 from the non-projection side is formed into a Z-direction linear polarization after penetrating the first polarization layer P1. After passing through the first 1/4 wave plate Q1, the right-hand circularly polarized light C2 is formed so as to pass through the cholesteric liquid crystal layer 102. The right-hand circularly polarized light C2 penetrates the electronically controlled wave plate 101 (configured as a half wave plate) to form left-hand circularly polarized light. After penetrating the second 1/4 wave plate Q2, the ambient light C2 is formed as Z-direction linear polarized light and absorbed by the second polarizing layer P2. Therefore, the ambient light C2 cannot transmit the electrically-controlled optical screen 10A, and the influence of the ambient light C2 from the non-projection side on the projected image quality is greatly reduced.
Based on the above, when the electrically controlled optical screen 10A is switched to the projection mode, the switchable scattering element 200 is configured to be in a scattering state, and the electrically controlled wave plate 101 is configured to be a half-wave plate, the electrically controlled optical screen 10A can largely avoid the influence of the ambient light C2 from the non-projection side and the ambient light C1 from the projection side on the quality of the projected image.
In order to fully illustrate the various embodiments of the invention, other embodiments of the invention are described below. It should be noted that the following embodiments use the element numbers and part of the content of the foregoing embodiments, where the same numbers are used to denote the same or similar elements, and descriptions of the same technical content are omitted. For the description of the omitted parts, reference is made to the foregoing embodiments, and the following embodiments are not repeated.
Referring to fig. 1, 2B and 2D simultaneously. Fig. 2B is a schematic diagram of an electronically controlled optical screen in accordance with an embodiment of the present invention. In this embodiment, the projection system 1 includes an electronically controlled optical screen 10B, a projection device 20, and a mirror 30, wherein the mirror 30 may be, for example, a mirror configured independently or a mirror configured in the same housing as the projection device 20. The projection device 20 is used for providing image light 20I. After being reflected by the reflecting mirror 30, the image light 20I is projected onto the electro-optic screen 10B from the projection side of the electro-optic screen 10B.
In this embodiment, the electro-optic screen 10B is different from the electro-optic screen 10A in that the electro-optic screen 10B further includes a fresnel lens layer 400, and a semi-transparent semi-reflective layer 401 is coated on the fresnel lens layer 400, wherein the semi-transparent semi-reflective layer 401 is coated on at least a portion of a surface of the fresnel lens layer 400 away from the switchable diffusing element 200, for example. The image light 20I is reflected by the transflective layer 401 and then enters the human eye, thereby improving the visual brightness and contrast. In one embodiment, the transflective layer 401 may be replaced by a reflective layer with a higher reflectivity.
In another embodiment, the electro-optic screen 10B further includes a hard surface layer 600 and a diffusion layer 500, and the diffusion layer 500 is disposed between the hard surface layer 600 and the fresnel lens layer 400, for example. After the image light 20I passes through the hard surface layer 600 and the diffusion layer 500, at least a portion of the image light 20I is reflected by the transflective layer 401 and sequentially passes through the diffusion layer 500 and the hard surface layer 600 to enter the human eye. The switchable diffuser 200 is used as a substrate and is used to diffuse and reflect the image light 20I that has penetrated the transflective layer 401 and another portion of the fresnel lens layer 400 to avoid glare. The hard surface layer 600 is used to protect the electro-optic screen 10B, which has a scratch-resistant function and may be made of transparent glass or plastic.
Referring to fig. 1, 2C and 2D simultaneously. Fig. 2C is a schematic diagram of an electronically controlled optical screen in accordance with an embodiment of the present invention. In the present embodiment, the projection system 1 includes an electronically controlled optical screen 10C, a projection device 20, and a mirror 30, wherein the mirror 30 may be, for example, a mirror configured independently or a mirror configured in the same housing as the projection device 20. The projection device 20 is used for providing image light 20I. After being reflected by the reflecting mirror 30, the image light 20I is projected from the projection side onto the electro-optic optical screen 10C.
In this embodiment, the electro-optic screen 10C is different from the electro-optic screen 10A in that the electro-optic screen 10B further includes a prism layer 700, wherein the prism layer 700 includes a plurality of prism structures arranged along the X direction, the reflective layer 701 and the light absorbing layer 702 are respectively coated on a surface of each prism structure of the prism layer, which is far from the switchable scattering element, and the reflective layer 701 and the light absorbing layer 702 are alternately arranged. The reflective layer 701 is disposed on the light-incident surface of each prism structure of the prism layer 700.
The image light 20I is reflected by the reflective layer 701 on the light-receiving surface of the prism structure and then enters the human eye, so as to improve the visual brightness and contrast of the image light 20I. Ambient light is absorbed by the light absorbing layer 702 on the prismatic structure to enhance contrast of the image. The switchable diffuser 200 is used as a substrate and diffuses and reflects a small portion of the image light 20I transmitted through the prism layer 700.
Referring to fig. 1 and 3 simultaneously. Fig. 3 is a schematic diagram of the optical mechanism of the electronically controlled optical screen 10A of fig. 1 in a decorative mode.
In the present embodiment, when the electrically controlled optical screen 10A is switched to the decoration mode, the switchable diffusing element 200 is configured to be in a transparent state, and the electrically controlled wave plate 101 is configured to be a half wave plate (half wave plate state).
The ambient light C2 from the non-projection side of the electro-optic optical screen 10A is formed into a Z-direction linear polarization after penetrating the first polarization layer P1. After passing through the first 1/4 wave plate Q1, the right-hand circularly polarized light C2 is formed so as to pass through the cholesteric liquid crystal layer 102. The right-hand circularly polarized light C2 penetrates the electronically controlled wave plate 101 (configured as a half wave plate) to form left-hand circularly polarized light. After penetrating the second 1/4 wave plate Q2, the ambient light C2 is formed as Z-direction linear polarized light and absorbed by the second polarizing layer P2.
The ambient light C1 from the projection side of the electro-optic optical screen 10A travels toward the switchable diffuser element 200, penetrates the switchable diffuser element 200, and forms linear polarization in the X direction after penetrating the second polarization layer P2. After penetrating the second 1/4 wave plate Q2, the ambient light C1 is formed as right-hand circularly polarized light, and after penetrating the electronically controlled wave plate 101 (configured as a half wave plate), is formed as left-hand circularly polarized light C1. When the left-handed circularly polarized light C1 enters the cholesteric liquid crystal layer 102, a part of the left-handed circularly polarized light C1 is reflected by the cholesteric liquid crystal layer 102 to form ambient light C11, and another part of the left-handed circularly polarized light C1 penetrates the cholesteric liquid crystal layer 102 because its wavelength is deviated from the dominant wavelength (dominant wavelength) corresponding to the cholesteric liquid crystal molecules. After passing through the first 1/4 wave plate Q1, the ambient light C1 passing through the cholesteric liquid crystal layer 102 is formed as linear polarized light in the X direction and is absorbed by the first polarizing layer P1.
After being reflected by the cholesteric liquid crystal layer 102, the ambient light C11 is formed into right-handed circularly polarized light C11 after penetrating the electronically controlled wave plate 101 (configured as a half-wave plate). After passing through the second 1/4 wave plate Q2, the ambient light C11 is formed as X-direction linear polarized light and passes through the second polarizing layer P2. Finally, the switchable scattering element 200, which penetrates the transparent state, allows the human eye to see the decorative pattern (e.g., wood grain) of the cholesteric liquid crystal layer 102.
Referring to fig. 1 and 4 simultaneously. Fig. 4 is a schematic diagram of the optical mechanism of the electronically controlled optical screen 10A of fig. 1 in a transparent mode.
In the present embodiment, the electrically controlled optical screen 10A is switched to a transparent mode, wherein the switchable scattering element 200 is configured to a transparent state and the electrically controlled wave plate 101 is configured to a state without phase retardation.
The ambient light C2 from the non-projection side of the electro-optic optical screen 10A is formed into a Z-direction linear polarization after penetrating the first polarization layer P1. After passing through the first 1/4 wave plate Q1, the right-hand circularly polarized light C2 is formed so as to pass through the cholesteric liquid crystal layer 102. The right-hand circularly polarized light C2 is still right-hand circularly polarized light after penetrating the electrically controlled wave plate 101 (without phase retardation function). After penetrating the second 1/4 wave plate Q2, the ambient light C2 is formed into X-direction linear polarized light, so as to penetrate the second polarized layer P2 and the transparent switchable scattering element 200.
The ambient light C1 from the projection side of the electro-optic optical screen 10A travels toward the switchable diffuser element 200, penetrates the switchable diffuser element 200, and forms linear polarization in the X direction after penetrating the second polarization layer P2. After penetrating the second 1/4 wave plate Q2, the ambient light C1 is formed into right-hand circular polarized light, and remains the right-hand circular polarized light C1 after penetrating the electrically controlled wave plate 101 (without phase retardation function), so that it is penetrated through the cholesteric liquid crystal layer 102. After penetrating the first 1/4 wave plate Q1, the ambient light C1 is formed as linear polarized light in the Z direction, and thus penetrates the first polarized layer P1. Therefore, when the electro-optic screen 10A is in the transparent mode, the ambient light incident from the opposite sides of the electro-optic screen 10A passes through the electro-optic screen 10A.
Referring to fig. 1 and 5 simultaneously. Fig. 5 is a schematic diagram of the optical mechanism of the electronically controlled optical screen 10A of fig. 1 in a daylighting mode.
In the present embodiment, the electronically controlled optical screen 10A is switched to a daylighting mode, wherein the switchable scattering element 200 is configured to a scattering state and the electronically controlled waveplate 101 is configured to have no phase retardation function. The difference between the transparent mode of the present embodiment and that of fig. 4 is that the ambient light C1 and the ambient light C2 are scattered by the switchable scattering element 200 of the electro-optic screen 10A, so as to have the peep-proof effect.
Referring to fig. 6 and 2D, fig. 6 is a schematic diagram of an electronically controlled optical screen according to an embodiment of the invention. Compared to the electro-optic screen 10A, the electro-optic decoration module 100D of the electro-optic screen 10D further includes a reflective polarizing layer P3 and an O-plate optical compensation film H1, wherein the reflective polarizing layer P3 is disposed between the second 1/4 wave plate Q2 and the second polarizing layer P2, and the O-plate optical compensation film H1 is disposed between the second polarizing layer P2 and the reflective polarizing layer P3. In the present embodiment, the reflection axis of the reflective polarizing layer P3 is parallel to the light absorption axis of the second polarizing layer P2 and is parallel to the direction Z, but the present invention is not limited thereto.
As in the embodiment of fig. 2A, a portion of the image light 20I is reflected and scattered by the switchable scattering element 200 to form a projected image that is seen by the human eye. In addition, a portion of the image light 20I passing through the switchable scattering element 200 (at least partially) passes through the second polarizer P2 and through the O-plate optical compensation film H1, and is formed as linear polarization in the Z direction. After the linear polarization light penetrating the O-plate optical compensation film H1 is reflected by the reflective polarizing layer P3, it penetrates the O-plate optical compensation film H1 again and is formed into linear polarization light penetrating the second polarizing layer P2. The linear polarized light can penetrate through the switchable scattering element 200 again, so that the light quantity of the image light 20I incident to the human eyes is effectively improved, and the contrast is improved.
In some embodiments, the O-Plate optical compensation film H1 may be replaced with two A-Plate or C-Plate optical axes that are perpendicular.
It should be noted that, in the embodiments of fig. 1 to 6, the optical axis of the first 1/4 wave plate Q1 and the optical axis of the second 1/4 wave plate Q2 may also be perpendicular, and the light absorption axis of the first polarizing layer P1 and the light absorption axis of the second polarizing layer P2 are parallel to each other. Since the optical axis of the first 1/4 wave plate Q1 is perpendicular to the optical axis of the second 1/4 wave plate Q2, the color shift phenomenon is reduced.
In some embodiments, the cholesteric liquid crystal layer 102 of the electro-optic screen 10A, the electro-optic screen 10B, the electro-optic screen 10C, and the electro-optic screen 10D is a right-handed cholesteric liquid crystal, and the optical axis of the first 1/4 wave plate Q1 and the slow axis of the second 1/4 wave plate Q2 are rotated by 90 degrees, so that the ambient light passes through the first polarizing layer P1 and the first 1/4 wave plate Q1 or passes through the second polarizing layer P2 and the second 1/4 wave plate Q2 and then becomes a left-handed circular polarized light, so that the ambient light can pass through the cholesteric liquid crystal layer 102 to hide the decorative pattern of the cholesteric liquid crystal layer 102, and the electro-optic screen presents a transparent mode.
Referring to fig. 7 and 2D, fig. 7 is a schematic diagram of an electronically controlled optical screen according to an embodiment of the invention. The electro-optic optical screen 10E includes a diffusing element 300 and an electro-optic decoration module 100. The scattering element 300 is disposed on one side of the electrically controlled decoration module 100, and the side is a non-projection side of the electrically controlled optical screen 10E. The electrically controlled decoration module 100 includes a first polarizing layer P1, a first 1/4 wave plate Q1, a cholesteric liquid crystal layer 102, an electrically controlled wave plate 101, a second 1/4 wave plate Q2, and a second polarizing layer P2, which are sequentially stacked, wherein the first polarizing layer P1 is located between the scattering layer 300 and the first 1/4 wave plate Q1. The electronically controlled wave plate 101 is provided with a liquid crystal layer. The light absorption axis of the first polarizing layer P1 is perpendicular to the light absorption axis of the second polarizing layer P2. In this embodiment, the light absorption axis of the first polarizing layer P1 is parallel to the X direction, and the light absorption axis of the second polarizing layer P2 is parallel to the Z direction. The optical axis of the first 1/4 wave plate Q1 is parallel to the optical axis of the second 1/4 wave plate Q2. The cholesteric liquid crystal layer 102 is for reflecting one of left-handed circularly polarized light or right-handed circularly polarized light.
The electronically controlled waveplate 101 may be a liquid crystal cell employing vertical alignment (Vertical Alignment, VA) technology, electronically controlled birefringence (Electrically controlled birefringence, ECB) technology, or In-Plane Switching (IPS) technology. For the embodiment using vertical alignment (Vertical Alignment, VA) techniques, the electronically controlled waveplate 101 can be switched between a half-waveplate state and a phase retardation free state by applying or not applying a voltage. Based on the structure and technology of the electronically controlled waveplate 101 described above, the electronically controlled optical screen 10E can be switched between different optical modes as will be described below. The electronic control optical screen 10E can be switched between a projection mode and a decoration mode, for example, as described in detail below.
Referring to fig. 2D, 7 and 8 simultaneously. Fig. 8 is a schematic diagram of the optical mechanism of the electronic control optical screen 10E of fig. 7 in the projection mode. In the present embodiment, the projection system 1 includes an electronically controlled optical screen 10E, a projection device 20, and a mirror 30. The projection device 20 is used for providing image light 20I. After being reflected by the reflecting mirror 30, the image light 20I is projected onto the electro-optical screen 10E from the projection side of the electro-optical screen 10E. Wherein the mirror 30 may be, for example, a mirror configured independently or a mirror configured within the same housing as the projection device.
In the present embodiment, the electronically controlled optical screen 10E is switched to the projection mode in which the electronically controlled waveplate 101 is configured in a phase retardation free state. The image light 20I (linear polarization in the X direction) from the projection device 20 passes through the second polarization layer P2. After passing through the second 1/4 wave plate Q2, the image light 20I is formed into right-hand circularly polarized light. Since the electrically controlled wave plate 101 is configured in a phase retardation-free state, the image light 20I is maintained as right-hand circularly polarized light after penetrating the electrically controlled wave plate 101, and thus penetrates the cholesteric liquid crystal layer 102. The right-hand circularly polarized light 20I is formed into a Z-direction linearly polarized light after passing through the first 1/4 wave plate Q1, so that it passes through the first polarizing layer P1 and is further reflected and scattered by the scattering element 300. The image light 20I reflected and scattered by the scattering element 300 sequentially passes through the first polarizing layer P1, the first 1/4 wave plate Q1, the cholesteric liquid crystal layer 102, the electrically controlled wave plate 101, the second 1/4 wave plate Q2 and the second polarizing layer P2, and forms the image light 20I incident on the human eye.
Referring to fig. 7 and 9 simultaneously. Fig. 9 is a schematic diagram of the optical mechanism of the electronically controlled optical screen 10E of fig. 7 in a decorative mode.
In the present embodiment, the electronically controlled optical screen 10E is switched to a decoration mode in which the electronically controlled wave plate 101 is configured in the state of a half wave plate. The ambient light C1 from the projection side is formed into linear polarization in the X direction after penetrating the second polarization layer P2. After penetrating the second 1/4 wave plate Q2, the ambient light C1 is formed as right-hand circularly polarized light, and after penetrating the electronically controlled wave plate 101 (configured as a half wave plate), is formed as left-hand circularly polarized light C1. When the left-handed circularly polarized light C1 enters the cholesteric liquid crystal layer 102, most of the left-handed circularly polarized light C1 is reflected by the cholesteric liquid crystal layer 102 to form left-handed circularly polarized light C11, and another part of the left-handed circularly polarized light C1 penetrates the cholesteric liquid crystal layer 102 (not shown) because its wavelength is deviated from the dominant wavelength (dominant wavelength) corresponding to the cholesteric liquid crystal molecules. The left-hand circularly polarized light passing through the cholesteric liquid crystal layer 102 passes through the first 1/4 wave plate Q1, and then forms linear polarized light in the X direction, which is absorbed by the first polarizing layer P1 (not shown).
After being reflected by the cholesteric liquid crystal layer 102, the left-handed circularly polarized light C11 is formed into right-handed circularly polarized light C11 after passing through the electronically controlled wave plate 101 (configured as a half-wave plate). After penetrating the second 1/4 wave plate Q2, the right-handed circularly polarized light C11 is formed as X-direction linearly polarized light and penetrates the second polarizing layer P2, so that the human eye can see the decoration pattern of the cholesteric liquid crystal layer 102.
In summary, the electrically controlled optical screen provided in the embodiment of the present invention includes an electrically controlled scattering element and an electrically controlled decoration module for switching between different optical modes. More specifically, the switchable scattering element can be switched between a scattering state and a transparent state, and can be matched with an electric control wave plate in the electric control decoration module to generate a plurality of optical modes. The various optical modes of the electronically controlled optical screen provide different visual sensations to the user. When the electronic control optical screen is configured into a projection mode, the visual brightness and contrast ratio can be effectively improved.
However, the foregoing is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims and their equivalents as filed in light of the foregoing disclosure. It is not necessary for a person to achieve all of the objects, advantages or features disclosed in the present invention to be satisfied by any one of the embodiments or the claims of the present invention. Furthermore, the abstract and title are provided for the purpose of facilitating patent document retrieval only, and are not intended to limit the scope of the claims. Furthermore, references to "first," "second," etc. in this specification or in the claims are only intended to name an element or distinguish between different embodiments or ranges, and are not intended to limit the upper or lower limit on the number of elements.
Reference numerals illustrate:
1: projection system
20: projection device
20I: image light
30: reflecting mirror
10A, 10B, 10C, 10D, 10E: electric control optical screen
100. 100D: electric control decoration module
101: electric control wave plate
102: cholesteric liquid crystal layer
200: switchable scattering element
300: scattering element
400: fresnel lens layer
401: semi-penetrating and semi-reflecting layer
500: diffusion layer
600: hard surface layer
700: prism layer
701: reflective layer
702: light absorbing layer
C1, C2, C11: ambient light
H1: o-plate optical compensation film
OA: optical axis
P1: a first polarizing layer
P2: a second polarizing layer
P3: reflective polarizing layer
Q1: first 1/4 wave plate
Q2: second 1/4 wave plate
X, Y, Z: direction.
Claims (17)
1. An electronically controlled optical screen comprising a switchable diffusing element and an electronically controlled decoration module for switching between different optical modes, wherein:
the switchable scattering element is arranged at one side of the electrically controlled decoration module for switching between a scattering state and a transparent state, and
the electric control decoration module comprises a first polarizing layer, a first 1/4 wave plate, a cholesterol liquid crystal layer, an electric control wave plate, a second 1/4 wave plate and a second polarizing layer which are sequentially laminated,
the electric control type wave plate is provided with a liquid crystal layer, the second polarizing layer is arranged between the switchable scattering element and the second 1/4 wave plate, the cholesterol liquid crystal layer is used for reflecting one of left-handed circular polarized light or right-handed circular polarized light, wherein the light absorption axis of the first polarizing layer is perpendicular to the light absorption axis of the second polarizing layer, the optical axis of the first 1/4 wave plate is parallel to the optical axis of the second 1/4 wave plate, or the light absorption axis of the first polarizing layer is parallel to the light absorption axis of the second polarizing layer, and the optical axis of the first 1/4 wave plate is perpendicular to the optical axis of the second 1/4 wave plate.
2. An electrically controlled optical screen according to claim 1, wherein the switchable scattering element comprises a liquid crystal layer.
3. The electrically controlled optical screen of claim 1, wherein the electrically controlled wave plate is one of a homeotropic alignment mode liquid crystal cell, an ECB mode liquid crystal cell, and an IPS mode liquid crystal cell.
4. The electrically controlled optical screen of claim 1, wherein when the electrically controlled optical screen is switched to projection mode, the switchable scattering element is configured as the scattering state and the electrically controlled wave plate is configured as a half wave plate.
5. The electro-optic screen of claim 4, wherein the electro-optic screen receives image light and the switchable scattering element is configured to scatter the image light when the electro-optic screen is in the projection mode.
6. The electrically controlled optical screen of claim 4, further comprising a fresnel lens layer, and the fresnel lens layer comprises a transflective layer, wherein the transflective layer is disposed on at least a portion of a surface of the fresnel lens layer remote from the switchable scattering element.
7. The electrically controlled optical screen of claim 4, further comprising a prismatic layer, and wherein the prismatic layer comprises a reflective layer, wherein the reflective layer is disposed on at least a portion of a surface of the prismatic layer remote from the switchable diffusing element.
8. The electrically controlled optical screen of claim 1, wherein the switchable scattering element is configured as the transparent state and the electrically controlled wave plate is configured as a half wave plate when the electrically controlled optical screen is switched to a decorative mode.
9. The electrically controlled optical screen of claim 1, wherein when the electrically controlled optical screen is switched to a transparent mode, the switchable scattering element is configured to the transparent state and the electrically controlled waveplate is configured to have no phase retardation function.
10. The electrically controlled optical screen of claim 1, wherein when the electrically controlled optical screen is switched to a daylighting mode, the switchable scattering element is configured to the scattering state and the electrically controlled waveplate is configured to have no phase retardation function.
11. The electrically controlled optical screen of claim 1, further comprising a reflective polarizing layer and an O-plate optical compensation film, wherein the reflective polarizing layer is disposed between the second 1/4 wave plate and the second polarizing layer, and the O-plate optical compensation film is disposed between the second polarizing layer and the reflective polarizing layer.
12. The electrically controlled optical screen of claim 11, wherein a reflection axis of the reflective polarizing layer is parallel to the light absorption axis of the second polarizing layer.
13. An electronically controlled optical screen comprising a diffusing element and an electronically controlled decoration module for switching between different optical modes, wherein:
the scattering element is arranged at one side of the electric control decoration module and
the electric control decoration module comprises a first polarizing layer, a first 1/4 wave plate, a cholesterol liquid crystal layer, an electric control wave plate, a second 1/4 wave plate and a second polarizing layer which are sequentially laminated,
the first polarizing layer is configured between the scattering element and the first 1/4 wave plate, the cholesterol liquid crystal layer is used for reflecting one of left-handed circular polarized light or right-handed circular polarized light, wherein the light absorption axis of the first polarizing layer is perpendicular to the light absorption axis of the second polarizing layer, the optical axis of the first 1/4 wave plate is parallel to the optical axis of the second 1/4 wave plate, or the light absorption axis of the first polarizing layer is parallel to the light absorption axis of the second polarizing layer, and the optical axis of the first 1/4 wave plate is perpendicular to the optical axis of the second 1/4 wave plate.
14. The electrically controlled optical screen of claim 13, wherein the electrically controlled wave plate is one of a homeotropic alignment mode liquid crystal cell, an ECB mode liquid crystal cell, and an IPS mode liquid crystal cell.
15. The electrically controlled optical screen of claim 13, wherein the electrically controlled waveplate is configured to have no phase retardation function when the electrically controlled optical screen is switched to projection mode.
16. The electro-optic screen of claim 15, wherein when the electro-optic screen is in the projection mode, the electro-optic screen receives image light, and the image light is scattered by the scattering element after sequentially penetrating the second polarizing layer, the second 1/4 wave plate, the electro-optic wave plate, the cholesteric liquid crystal layer, the first 1/4 wave plate, and the first polarizing layer.
17. The electrically controlled optical screen of claim 13, wherein the electrically controlled wave plate is configured as a half wave plate when the electrically controlled optical screen is switched to a decorative mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/340,885 US20240036429A1 (en) | 2022-07-28 | 2023-06-25 | Electrically controlled optical screen |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US202263392866P | 2022-07-28 | 2022-07-28 | |
| US63/392,866 | 2022-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117518566A true CN117518566A (en) | 2024-02-06 |
Family
ID=89638521
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211173446.5A Pending CN117518566A (en) | 2022-07-28 | 2022-09-26 | Electric control optical screen |
| CN202310494189.3A Pending CN117471749A (en) | 2022-07-28 | 2023-05-05 | Electric control optical screen |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310494189.3A Pending CN117471749A (en) | 2022-07-28 | 2023-05-05 | Electric control optical screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN117518566A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117826475A (en) * | 2024-03-04 | 2024-04-05 | 汕头超声显示器技术有限公司 | Electronic rearview mirror with display function |
-
2022
- 2022-09-26 CN CN202211173446.5A patent/CN117518566A/en active Pending
-
2023
- 2023-05-05 CN CN202310494189.3A patent/CN117471749A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN117471749A (en) | 2024-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3343282B1 (en) | Display device | |
| KR101087627B1 (en) | Mirror with built-in display | |
| CN114341681A (en) | Optical stack for privacy display | |
| US6144430A (en) | Reflective-type liquid crystal display with single polarizer and an inner metallic reflector | |
| AU2001251596B2 (en) | Polarized display with wide-angle illumination | |
| US20050117095A1 (en) | Reflective cholesteric displays employing linear polarizer | |
| JPS5824122A (en) | Display unit | |
| JP3345755B2 (en) | Display device and electronic device using the same | |
| JP2728059B2 (en) | Reflective liquid crystal display | |
| CN113646695A (en) | Diffuser for a privacy display | |
| KR20000006520A (en) | Liquid crystal display device | |
| KR100294545B1 (en) | Reflective type liquid crystal display | |
| US20050206811A1 (en) | Novel optical configurations in high contrast chiral nematic liquid crystal displays | |
| JP2000075285A (en) | Reflection type liquid crystal display device | |
| JPH08292413A (en) | Liquid crystal display device | |
| KR20040031858A (en) | Liquid crystal display | |
| CN117471749A (en) | Electric control optical screen | |
| US20060098141A1 (en) | High contrast black-and-white chiral nematic displays | |
| US20110102311A1 (en) | Backlight unit and liquid crystal display device | |
| US20240036429A1 (en) | Electrically controlled optical screen | |
| JP2001194660A (en) | Liquid crystal display device | |
| JPH11109336A (en) | Liquid crystal display device | |
| US20110102477A1 (en) | Liquid crystal display device | |
| WO2005064389A1 (en) | Transflective lcd device | |
| JP2002174813A (en) | Liquid crystal display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |