CN114217485A - Display assembly and rearview mirror display screen - Google Patents
Display assembly and rearview mirror display screen Download PDFInfo
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- CN114217485A CN114217485A CN202210156281.4A CN202210156281A CN114217485A CN 114217485 A CN114217485 A CN 114217485A CN 202210156281 A CN202210156281 A CN 202210156281A CN 114217485 A CN114217485 A CN 114217485A
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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
- G02F1/137—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
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- Crystallography & Structural Chemistry (AREA)
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- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Liquid Crystal (AREA)
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Abstract
The application discloses display module and rear-view mirror display screen relates to the display screen field. A display assembly comprising: the display module comprises a cholesteric liquid crystal layer, a quarter wave plate, a linear polarizer and a display module which are sequentially superposed; under the condition that the cholesteric liquid crystal layer is electrified, display light emitted by the display module sequentially penetrates through the linear polarizer, the quarter-wave plate and the cholesteric liquid crystal layer, so that the display assembly has a display function; under the condition that the cholesteric liquid crystal layer is powered off, display light emitted by the display module sequentially penetrates through the linear polarizer and the quarter-wave plate, and is reflected on one side, facing the quarter-wave plate, of the cholesteric liquid crystal layer, and ambient light is reflected on one side, facing away from the quarter-wave plate, of the cholesteric liquid crystal layer. A rearview mirror display screen comprises the display assembly. The method and the device can solve the problems that the contrast of a displayed image is poor, negative influence is caused to a driver wearing the polarized lens, the cost of the current reflective polaroid is high, and the like.
Description
Technical Field
This application belongs to display screen technical field, concretely relates to display module and rear-view mirror display screen.
Background
The addition of a display screen in an automobile rearview mirror is one of the trends of vehicle-mounted design in recent years, and the main application of the display screen is to integrate a vehicle event data recorder into the rearview mirror and also to display a reversing image. Currently, a rearview mirror display screen adopts a backlight type display mode, and a display module of the rearview mirror display screen is positioned behind a lens; when not displaying the image, the display module closes, and the rear-view mirror display screen acts as the rear-view mirror and uses.
The current automobile rearview mirror adopts the design as shown in fig. 1 and fig. 2, and ambient light reflects light in a polarization state 1 after passing through a reflective polarizer 02 to play a role of the rearview mirror; the reflective polarizer 02 is capable of emitting light of polarization 1 and transmitting light of polarization 2 orthogonal thereto. The rear display device 04 (e.g. IPS-LCD, OLED, etc.) is lit up in display mode, and filters out light of polarization state 2 after passing through a linear polarizer 03, passing through the reflective polarizer 02 and finally through the glass plate 01. Therefore, in the display area, the signal intensity of the display screen is higher than that of the reflected image, so that the displayed image can be observed.
However, in the display mode of the above-mentioned automobile rearview mirror, the display area simultaneously transmits an image and reflects ambient light, so that the contrast to the displayed image is poor, and image overlap is easily generated; the emergent light displayed and reflected is linearly polarized light, so that the condition has negative influence on a driver wearing polarized lenses (such as sunglasses) and the phenomenon of dim eyes in the orthogonal direction is easy to generate; meanwhile, the high-performance reflective polarizer with a wide wavelength is expensive to manufacture, and the reflective polarizer covers almost the entire area of the rearview mirror, which is not favorable for cost reduction.
Disclosure of Invention
The purpose of the embodiment of this application is to provide display module and rear-view mirror display screen, can solve display image contrast difference, cause negative effects to the driver who wears the polarization lens to and current reflective polaroid is with high costs scheduling problem.
In order to solve the technical problem, the present application is implemented as follows:
an embodiment of the present application provides a display assembly, which includes: the display module comprises a cholesteric liquid crystal layer, a quarter wave plate, a linear polarizer and a display module which are sequentially superposed;
under the condition that the cholesteric liquid crystal layer is electrified, display light emitted by the display module sequentially penetrates through the linear polarizer, the quarter-wave plate and the cholesteric liquid crystal layer, so that the display module has a display function;
under the condition that the cholesteric liquid crystal layer is powered off, display light emitted by the display module sequentially penetrates through the linear polarizer and the quarter-wave plate, and is reflected on one side, facing the quarter-wave plate, of the cholesteric liquid crystal layer, and ambient light is reflected on one side, facing away from the quarter-wave plate, of the cholesteric liquid crystal layer.
An embodiment of the present application further provides another display assembly, including: the display module comprises a cholesteric liquid crystal layer, a quarter wave plate and a display module which are sequentially stacked, wherein the display module comprises a linear polarizer;
under the condition that the cholesteric liquid crystal layer is electrified, display light emitted by the display module sequentially penetrates through the quarter-wave plate and the cholesteric liquid crystal layer, so that the display assembly has a display function;
under the condition that the cholesteric liquid crystal layer is powered off, display light emitted by the display module penetrates through the quarter-wave plate and is reflected on one side, facing the quarter-wave plate, of the cholesteric liquid crystal layer, and ambient light is reflected on one side, facing away from the quarter-wave plate, of the cholesteric liquid crystal layer.
The embodiment of the application also provides a rearview mirror display screen, which comprises the display component in the first form or the display component in the second form, and in addition, also comprises a glass layer and a reflecting component;
the display assembly and the reflection assembly are connected with the inner side face of the glass layer, the display assembly is located in one side area of the glass layer, and the reflection assembly is located in the other side area of the glass layer.
In the embodiment of the application, the cholesteric liquid crystal layer can enable processed display light to penetrate under the power-on condition, so that the display assembly has a display function, the cholesteric liquid crystal layer can block the processed display light under the power-off condition and reflects the display light, the display light cannot penetrate through the cholesteric liquid crystal layer to be emitted, and at the moment, the display assembly plays a role in reflecting ambient light.
Based on the setting, this application embodiment can control the display module through controlling cholesteric liquid crystal layer circular telegram or outage and switch between demonstration mode and speculum mode to can promote the display contrast of display module, guarantee the definition of image, the image overlapping display can not appear, the user of being convenient for watches.
Meanwhile, when showing, the display light that display module sent handles the back through line polaroid and quarter wave plate, the light that sees through cholesteric liquid crystal layer and jets out is the circular polarization state, in addition, the ambient light through the reflection of cholesteric liquid crystal layer is the circular polarization state equally, it is the linear polarization state to compare in the emergent light that present automobile rearview mirror shows and reflect, display module in the embodiment of this application is when being applied to automobile rearview mirror, can not lead to the fact harmful effects to the driver who wears the polarization lens, thereby can effectively avoid producing dim phenomenon in the front of the eye on the orthogonal direction, provide good vision enjoyment for the driver.
Drawings
Fig. 1 is a structure and light path diagram of a rearview mirror display screen in a rearview mirror mode in the related art;
FIG. 2 is a diagram of a display mode of a rearview mirror display screen and a light path in the related art;
FIG. 3 is a schematic structural diagram of a display screen of a rearview mirror disclosed in an embodiment of the present application;
fig. 4 is a schematic diagram of the cholesteric liquid layer switching between the power-on and power-off states according to the embodiment of the present application;
FIG. 5 is a schematic view of a first type of rearview mirror display screen in a rearview mirror mode according to an embodiment of the present disclosure;
FIG. 6 is a diagram of a display mode of a rearview mirror display screen according to a first form disclosed in an embodiment of the present application;
FIG. 7 is a structural and optical diagram of a second form of rearview mirror display screen in a rearview mirror mode as disclosed in an embodiment of the present application;
fig. 8 is a structural view and an optical path diagram of a rearview mirror display screen of a second form in a display mode, which are disclosed in the embodiment of the present application.
Description of reference numerals:
01-a glass sheet; 02-reflective polarizer; 03-linear polarizer; 04-a display device;
100-a display component; 110-cholesteric liquid crystal layer; 111-a first conductive layer; 112-a second conductive layer; 113-cholesteric liquid crystal system; 120-quarter wave plate; 130-linear polarizer; 140-a display module;
200-a reflective component; 210-a reflective layer; 220-a light absorbing layer;
300-glass layer.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. The embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 3 to 6, the present embodiment discloses a display assembly 100, wherein the display assembly 100 may be applied to a rear view mirror of an automobile, and may also be applied to other apparatuses besides the rear view mirror, which is not particularly limited in the present embodiment.
Referring to fig. 3, the disclosed display assembly 100 includes a cholesteric liquid crystal layer 110, a quarter-wave plate 120, a linear polarizer 130, and a display module 140.
The cholesteric liquid crystal layer 110 is an intelligent adjustable reflective layer, and can switch between a display mode and a reflective mode by using an electric field driving mode, and in the display mode, the layer does not reflect ambient light and displays an image, and in the reflective mode, the layer can completely block the display light from the display module 140 and reflect the ambient light.
The quarter-wave plate 120 is a birefringent single crystal wave plate with a certain thickness, and when light is transmitted through the wave plate from normal incidence, the phase difference between the ordinary light (o light) and the extraordinary light (e light) is equal to pi/2 or an odd multiple thereof, and such a wafer is called as the quarter-wave plate 120. When the linear polarization state is vertically incident on the quarter-wave plate 120, and the polarization of light makes an angle θ with the optical axis plane (vertical natural splitting plane) of the plate, the emitted light becomes an elliptical polarization state after being emitted, and particularly when θ =45 °, the emitted light becomes a circular polarization state.
The linear polarizer 130 is an optical device that can process the passing light to form a linear polarization state.
The display module 140 is a light emitting device that emits display light to form a predetermined image.
The display module 100 of the present application is configured by stacking the cholesteric liquid crystal layer 110, the quarter-wave plate 120, the linear polarizer 130, and the display module 140 in this order. In practical applications, the cholesteric liquid crystal layer 110, the quarter-wave plate 120, the linear polarizer 130 and the display module 140 are stacked in sequence from the outside to the inside.
Thus, when the function of displaying images is required, the display light emitted by the display module 140 can be processed by the linear polarizer 130 and the quarter-wave plate 120 in sequence to form a circular polarization state, and the circular polarization state is transmitted through the cholesteric liquid crystal layer 110 and emitted outwards, so that a preset image is displayed for viewing; when the reflection function is needed, the display module 140 can still be in the on state and emit display light, the display light is processed by the polarizing plate 130 and the quarter-wave plate 120 to form a circular polarization state, at this time, the cholesteric liquid crystal layer 110 blocks the circular polarization state and the circular polarization state is reflected at the inner side of the cholesteric liquid crystal layer 110, so that the display light emitted by the display module 140 cannot be emitted outwards through the cholesteric liquid crystal layer 110, and a preset image cannot be formed; meanwhile, when the ambient light is irradiated to the cholesteric liquid crystal layer 110, reflection occurs, so that a reflection function can be provided.
In order to enable the cholesteric liquid crystal layer 110 to be switched between the display mode and the reflective mode, the cholesteric liquid crystal layer 110 may be powered on or off. Specifically, when the cholesteric liquid crystal layer 110 is powered on, the cholesteric liquid crystal layer can transmit light, and at this time, the display light emitted by the display module 140 sequentially transmits through the linear polarizer 130, the quarter-wave plate 120 and the cholesteric liquid crystal layer 110 and is emitted outward, so that the display module 100 exhibits a display function, and thus a preset image can be displayed for viewing; under the condition that the cholesteric liquid crystal layer 110 is powered off, the cholesteric liquid crystal layer can block light, at the moment, display light emitted by the display module 140 sequentially penetrates through the linear polarizer 130 and the quarter-wave plate 120 and is reflected on the side, facing the quarter-wave plate 120, of the cholesteric liquid crystal layer 110, so that the display light can be blocked from being emitted outwards, and meanwhile, ambient light irradiates the side, facing away from the quarter-wave plate 120, of the cholesteric liquid crystal layer 110 and is reflected, so that the reflection function is achieved.
It should be noted here that, when the cholesteric liquid crystal layer 110 is powered off, the display module 140 does not need to be turned off, and the emitted display light passes through the polarizing plate 130 and the quarter-wave plate 120 and then is converted into a circular polarization state with the same handedness as that of the cholesteric liquid crystal, and does not pass through the cholesteric liquid crystal layer 110, which can also prevent the display module 100 from leaking light and causing stray light to affect the display effect. After the electric field is applied, the cholesteric liquid crystal layer 110 is switched to a light-transmitting mode, and ambient light reflection is reduced while the display light behind is transmitted, thereby achieving the purpose of displaying an image.
Based on the above arrangement, the display module 100 can be controlled to switch between the display mode and the reflector mode by controlling the power-on or power-off of the cholesteric liquid crystal layer 110 in the embodiment of the application, so that the development contrast of the display module 100 can be improved, the definition of images is ensured, image overlapping development cannot occur, and the user can watch the images conveniently.
Meanwhile, when displaying, the display light emitted by the display module 140 is processed by the linear polarizer 130 and the quarter-wave plate 120 in sequence, the light emitted through the cholesteric liquid crystal layer 110 is in a circular polarization state, and in addition, the ambient light reflected by the cholesteric liquid crystal layer 110 is also in a circular polarization state, and compared with the situation that the emergent light displayed and reflected by the current automobile rearview mirror is in a linear polarization state, when the display module 100 in the embodiment of the application is applied to the automobile rearview mirror, the display module does not have adverse effects on a driver wearing the polarizing lens, so that the phenomenon that the front of the eyes is dim in the orthogonal direction can be effectively avoided, and good visual enjoyment is provided for the driver.
In the embodiment of the present application, the cholesteric liquid crystal layer 110 is a switchable circular polarization reflective device, and includes a first conductive layer 111, a second conductive layer 112, and a cholesteric liquid crystal system 113, and the cholesteric liquid crystal system 113 is connected between the first conductive layer 111 and the second conductive layer 112, as shown in fig. 4. The first conductive layer 111 and the second conductive layer 112 are both connected to a power supply to control the voltage of the applied electric field.
The cholesteric liquid crystal system 113 is a polymer stabilized cholesteric liquid crystal system 113, and the specific principle is as follows: the parallel arranged cholesteric liquid crystal has a spiral twisted structure, so that the cholesteric liquid crystal layer 110 has the property of selective light reflection, a circular polarization state with the same rotation as the spiral is reflected, and the opposite polarization state is transmitted.
When a helix having a plurality of pitches exists within the thickness range of the cholesteric liquid crystal system 113, the reflection band of the cholesteric liquid crystal system 113 can be widened, and the use of a liquid crystal polymer network is an effective means for stabilizing the plurality of pitches of the cholesteric phase, mainly a means for generating a concentration gradient by a polymer monomer. When the existing screw pitch covers the visible light range of 400-700 nm, the mirror can be used as a reflector.
When the movable liquid crystal in the cholesteric liquid crystal system 113 is an electropositive liquid crystal, applying an electric field in the thickness direction of the cholesteric liquid crystal layer 110 will make the liquid crystal molecules vertically aligned with each conductive layer, and at this time, the mirror reflection state disappears and the state is converted into a light transmission state. When the electric field is removed, the movable liquid crystals in the cholesteric liquid crystal system 113 rearrange into parallel multi-pitch cholesteric state according to the memory of the polymer network, and at this time, the mirror reflection property is recovered and the light can be blocked.
Based on the above principle, in the embodiment of the present application, when the first conductive layer 111 and the second conductive layer 112 are both energized, the handedness of the circular polarization state generated after the display light emitted from the display module 140 sequentially passes through the linear polarizer 130 and the quarter-wave plate 120 is opposite to the handedness exhibited by the cholesteric liquid crystal system. In this way, the circularly polarized state can be transmitted through the cholesteric liquid crystal layer 110 and emitted to the outside, thereby realizing a display function.
When the first conductive layer 111 and the second conductive layer 112 are disconnected, the rotation of the display light emitted from the display module 140 after passing through the linear polarizer 130 and the quarter-wave plate 120 in sequence is the same as the rotation exhibited by the cholesteric liquid crystal system 113. In this way, the circularly polarized state cannot pass through the cholesteric liquid crystal layer 110 and is reflected by the cholesteric liquid crystal layer 110, and at the same time, the ambient light is reflected by the cholesteric liquid crystal layer 110, thereby realizing a reflection function.
In order to ensure that the circularly polarized state is formed after the linear polarizer 130 and the quarter-wave plate 120 are processed, in the embodiment of the present application, a predetermined angle is formed between the optical axis of the quarter-wave plate 120 and the polarization axis of the linear polarizer 130. Optionally, the preset included angle may be 45 ° to ensure that the emergent light is in a circular polarization state. It should be noted here that the quarter-wave plate 120 has an optical axis that is twisted by 45 ° with respect to the polarization axis of the linear polarizer 130.
In consideration of the phenomenon of blue shift of the reflection wavelength of the side viewing angle of the cholesteric liquid crystal, in the embodiment of the present application, the cholesteric liquid crystal layer 110 adopts a liquid crystal layer having a broadband reflection property that the front viewing angle reflection waveband is 400-1000 nm. Therefore, the problem of blue shift of reflection wavelength of the cholesteric liquid crystal at the side viewing angle can be overcome.
In the embodiment of the present application, the display module 140 provides a light source for a display screen, which may adopt various display technologies, such as OLED, micro led, electronic ink display, etc. Of course, the present invention is not limited to this, and other display technologies may be used, and the embodiments of the present invention are not particularly limited.
Here, the display unit does not have a linear polarization function, and in this case, the linear polarizer 130 needs to be additionally disposed so that the display light emitted from the display module 140 is processed by the linear polarizer 130 to form a linear polarization state. Of course, some display components have a linear polarization function, such as LCD, etc., and in this case, the linear polarization state can be formed without additionally configuring the linear polarizer 130.
Referring to fig. 3, 4, 7 and 8, the present embodiment provides another display assembly 100, which may be applied to a rear view mirror of an automobile, and may be applied to other apparatuses, which is not particularly limited in the present embodiment.
This form of display module 100 includes a cholesteric liquid crystal layer 110, a quarter-wave plate 120, and a display module 140 stacked in this order, wherein the display module 140 includes a linear polarizer 130. In practical application, the cholesteric liquid crystal layer 110, the quarter-wave plate 120 and the display module 140 are sequentially stacked from outside to inside.
It should be noted here that the structure and function of the cholesteric liquid crystal layer 110 and the quarter-wave plate 120 are substantially the same as those of the display module 100 of the first form, and the description thereof is omitted here. The display assembly 100 of this form differs from the display assembly 100 of the first form described above mainly in that: in the display module 100 of the first form, the display module 140 does not have a linear polarization function, and the linear polarizer 130 needs to be separately configured, so that the display light emitted by the display module 140 forms a linear polarization state after passing through the linear polarizer 130, and then the linear polarization state forms a circular polarization state after being processed by the quarter-wave plate 120; in the display module 100, the display module 140 includes the linear polarizer 130, which has a linear polarization function, so that the linear polarizer 130 does not need to be additionally disposed, and thus the display module 140 can directly emit a linear polarization state, and the linear polarization state is processed by the quarter-wave plate 120 to form a circular polarization state.
Based on the above arrangement, when the cholesteric liquid crystal layer 110 is powered on, the display light emitted by the display module 140 sequentially passes through the quarter-wave plate 120 and the cholesteric liquid crystal layer 110, so that the display module 100 exhibits a display function; under the condition that the cholesteric liquid crystal layer 110 is powered off, display light emitted by the display module 140 passes through the quarter-wave plate 120 and is reflected on the side, facing the quarter-wave plate 120, of the cholesteric liquid crystal layer 110, and ambient light is reflected on the side, facing away from the quarter-wave plate 120, of the cholesteric liquid crystal layer 110.
Based on the above arrangement, the display module 100 of this manner can control the display module 100 to switch between the display mode and the mirror mode by controlling the power-on or power-off of the cholesteric liquid crystal layer 110, so that the contrast of the display module 100 can be improved, the definition of the image can be ensured, the image overlapping display can not occur, and the user can watch the image conveniently.
Meanwhile, when showing, the demonstration light that display module 140 sent handles the back through quarter-wave plate 120, the light that penetrates cholesteric liquid crystal layer 110 and jets out is the circular polarization state, in addition, the ambient light that passes through cholesteric liquid crystal layer 110 reflection is the circular polarization state equally, it is the linear polarization state to compare in present automobile rearview mirror demonstration and the emergent light of reflection, display module 100 in this application embodiment is when being applied to automobile rearview mirror, can not cause harmful effects to the driver who wears the polarization lens, thereby can effectively avoid producing dim phenomenon in the front of the eye on the orthogonal direction, provide good vision enjoyment for the driver.
Referring to fig. 4, in this form of the display element 100, the cholesteric liquid crystal layer 110 includes a first conductive layer 111, a second conductive layer 112, and a cholesteric liquid crystal system 113 connected between the first conductive layer 111 and the second conductive layer 112; when the first conductive layer 111 and the second conductive layer 112 are both energized, the display light emitted from the display module 140 passes through the quarter-wave plate 120 to generate the handedness of the circular polarization state, which is opposite to the handedness exhibited by the cholesteric liquid crystal system 113; under the condition that the first conductive layer 111 and the second conductive layer 112 are disconnected, the rotation property of the circular polarization state generated after the display light emitted by the display module 140 passes through the quarter-wave plate 120 is the same as the rotation property exhibited by the cholesteric liquid crystal system 113.
It should be noted here that the specific structure and principle of the cholesteric liquid crystal layer 110 are substantially the same as those of the cholesteric liquid crystal layer 110 in the display module 100 of the first form, and reference may be made to the above-mentioned correspondence specifically, and details are not described here again.
Considering that the display module 140 in the form of an LCD is provided with the linear polarizer 130 at the uppermost layer, in the embodiment of the present application, the display module 140 may be an LCD, and at this time, the linear polarizer 130 does not need to be additionally configured, which can also meet practical requirements.
Referring to fig. 3 to 8, based on the two display assemblies 100, a rearview mirror display screen is further disclosed in an embodiment of the present application, and the disclosed rearview mirror display screen includes the first display assembly 100 or the second display assembly 100. In addition, the rearview mirror display screen includes a glass layer 300 and a reflective assembly 200.
The display assembly 100 and the reflective assembly 200 are both connected to the inner side of the glass layer 300, the display assembly 100 is located in one side region of the glass layer 300, and the reflective assembly 200 is located in the other side region of the glass layer 300. Based on this, the display screen of the rearview mirror is divided into a display part and a reflection part, the display part mainly provides a display function through the display component 100, the reflection part mainly provides a reflection function through the reflection component 200, of course, when the cholesteric liquid crystal layer 110 of the display component 100 is in a power-off state, the display component 100 can also provide a reflection function, at this time, the whole display screen of the rearview mirror is used for reflection and acts as a rearview mirror, so that the area of the rearview mirror is enlarged, and the visual field of a driver is increased.
Compare in current automobile rearview mirror adopt wide wavelength's high performance reflection formula polaroid, and the reflection formula polaroid covers whole rear-view mirror area, the rear-view mirror display screen in this application embodiment need not to adopt reflection formula polaroid, can reduce the cost of rear-view mirror display screen to a certain extent.
In some embodiments, the reflective member 200 includes a reflective layer 210, and the reflection band range of the reflective layer 210 includes the reflection band range of the cholesteric liquid crystal layer 110. Alternatively, the reflection band range of the reflection layer 210 and the reflection band range of the cholesteric liquid crystal layer 110 may be made approximately the same, and thus, the optical properties of the reflection layer 210 are made close to those of the cholesteric liquid crystal layer 110 in the no-electric-field state to ensure that the reflection performance of the display screen of the rear view mirror is substantially the same in the display part and the reflection part to improve the visual sensation of the driver.
Optionally, the reflective layer 210 is a linear polarizing mirror or a circular polarizer. Besides, other forms of reflective lenses are also possible, and the embodiment of the present application is not particularly limited in this respect.
In a specific embodiment, the reflective layer 210 can be a cholesteric liquid crystal polymer with transflective properties such that the intensity of the reflected light can be matched to the cholesteric liquid crystal layer 110 to enhance viewing comfort.
In the embodiment of the present application, the reflective assembly 200 further includes a light absorbing layer 220, and the light absorbing layer 220 is disposed on a side of the reflective layer 210 away from the glass layer 300 and is used for absorbing the circularly polarized light transmitted through the reflective layer 210.
Referring to fig. 5 and 6, the present embodiment provides a specific rear view mirror display panel, in which the display module 140 employs an OLED display, and in this case, the linear polarizer 130 needs to be additionally disposed, and a compensation film layer such as an anti-reflection film may not be needed, and the reflective layer 210 employs an aluminum mirror.
As shown in fig. 5, in the rear view mirror mode, ambient light passes through the glass layer 300 and then irradiates the cholesteric liquid crystal layer 110 and the reflective layer 210, respectively, and at this time, both form a reflective circular polarization state 1 and the cholesteric liquid crystal layer 110 forms a transmissive circular polarization state 2; the circularly polarized state 2 transmitted through the cholesteric liquid crystal layer 110 is converted into a linearly polarized state 2 through the quarter-wave plate 120, and the linearly polarized state 2 is absorbed by the linear polarizer 130 to block its further propagation; meanwhile, the display light emitted from the display module 140 passes through the linear polarizer 130 to form a linear polarization state 1, the linear polarization state 1 passes through the quarter-wave plate 120 to form a circular polarization state 1, and the circular polarization state 1 is reflected by the cholesteric liquid crystal layer 110 and returns in the opposite direction.
As shown in fig. 6, in the display mode, the ambient light is not reflected by the cholesteric liquid crystal layer 110, and the display light emitted by the OLED is converted into the linear polarization state 1 through the linear polarizer 130, the linear polarization state 1 is converted into the circular polarization state 1 through the quarter-wave plate 120, and the circular polarization state 1 is emitted outward through the cholesteric liquid crystal layer 110 to realize the display function; at the same time, ambient light impinges on the reflective layer 210 to form a reflected circularly polarized state 1.
Referring to fig. 7 and 8, in another specific rear view mirror display panel, the display module 140 uses an LCD display without an additional linear polarizer 130, and the reflective layer 210 uses a cholesteric liquid crystal polymer (i.e., 400-1000 nm) having the same wide wavelength band as the cholesteric liquid crystal layer 110, so that the optical properties of the cholesteric liquid crystal layer 110 are close to those of the cholesteric liquid crystal layer 110 in an electric field-free state.
As shown in fig. 7, in the rear view mirror mode, ambient light passes through the glass layer 300 and then irradiates the cholesteric liquid crystal layer 110 and the reflective layer 210, respectively, and at this time, both form a reflected circular polarization state 1 and a transmitted circular polarization state 2, wherein the reflected circular polarization state 1 is left-handed circularly polarized light and the transmitted circular polarization state 2 is right-handed circularly polarized light, or the reflected circular polarization state 1 is right-handed circularly polarized light and the transmitted circular polarization state 2 is left-handed circularly polarized light; the circularly polarized state 2 transmitted through the cholesteric liquid crystal layer 110 is converted into a linearly polarized state 2 through the four-half wave plate, and the linearly polarized state 2 is absorbed by the linear polarizer 130 in the LCD to block the continuous propagation; the circularly polarized state 2 transmitted through the reflective layer 210 is absorbed by the light absorbing layer 220; meanwhile, the display module 140 emits the linear polarization state 1, the linear polarization state 1 forms the circular polarization state 1 after passing through the quarter-wave plate 120, and the circular polarization state 1 is reflected by the cholesteric liquid crystal layer 110 and returns in the opposite direction.
As shown in fig. 8, in the display mode, the ambient light is not reflected by the cholesteric liquid crystal layer 110, and the linear polarization state 1 emitted by the LCD is converted into the circular polarization state 1 by the quarter-wave plate 120, and then the circular polarization state 1 is emitted outward by passing through the cholesteric liquid crystal layer 110, so as to implement the display function; meanwhile, the ambient light irradiates the reflective layer 210, a part of the ambient light is reflected by the reflective layer 210 to form a reflected circularly polarized state 1, another part of the ambient light transmits through the reflective layer 210 to form a circularly polarized state 2, and the circularly polarized state 2 is absorbed by the light absorbing layer 220.
To sum up, in this application embodiment, through the adjustable reflection stratum of intelligence that uses the stable cholesteric liquid crystal of polymer as the rear-view mirror, can switch the display mode and the rear-view mirror mode of rear-view mirror display screen through electric field drive, under the display mode, this adjustable reflection stratum does not reflect ambient light and shows the image, under the rear-view mirror mode, this adjustable reflection stratum completely obstructs the light that comes from display module 140 and reflects ambient light to the image contrast of rear-view mirror display screen has been promoted.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. A display assembly (100), comprising: the display panel comprises a cholesteric liquid crystal layer (110), a quarter-wave plate (120), a linear polarizer (130) and a display module (140) which are sequentially stacked;
under the condition that the cholesteric liquid crystal layer (110) is electrified, display light emitted by the display module (140) sequentially penetrates through the linear polarizer (130), the quarter-wave plate (120) and the cholesteric liquid crystal layer (110) so that the display module (100) can display functions;
under the condition that the cholesteric liquid crystal layer (110) is powered off, display light emitted by the display module (140) sequentially penetrates through the linear polarizer (130) and the quarter-wave plate (120) and is reflected on the side, facing the quarter-wave plate (120), of the cholesteric liquid crystal layer (110), and ambient light is reflected on the side, facing away from the quarter-wave plate (120), of the cholesteric liquid crystal layer (110).
2. The display assembly (100) according to claim 1, wherein the cholesteric liquid crystal layer (110) comprises a first conductive layer (111), a second conductive layer (112) and a cholesteric liquid crystal system (113) connected between the first conductive layer (111) and the second conductive layer (112);
when the first conductive layer (111) and the second conductive layer (112) are both electrified, the helicity of a circular polarization state generated after the display light emitted by the display module (140) sequentially passes through the linear polarizer (130) and the quarter-wave plate (120) is opposite to the helicity presented by the cholesteric liquid crystal system (113);
when the first conductive layer (111) and the second conductive layer (112) are electrically disconnected from each other, the handedness of the circular polarization state generated by the display light emitted from the display module (140) after sequentially passing through the linear polarizer (130) and the quarter-wave plate (120) is the same as the handedness exhibited by the cholesteric liquid crystal system (113).
3. The display assembly (100) of claim 1, wherein the optical axis of the quarter-wave plate (120) is at a predetermined angle to the polarization axis of the linear polarizer (130).
4. The display assembly (100) of claim 1, wherein the cholesteric liquid crystal layer (110) is a liquid crystal layer having a broadband reflection property with a positive viewing angle reflection band of 400-1000 nm.
5. The display assembly (100) of claim 1, wherein the display module (140) is one of an OLED, a micro led, and an electronic ink.
6. A display assembly (100), comprising: the display module comprises a cholesteric liquid crystal layer (110), a quarter-wave plate (120) and a display module (140) which are sequentially stacked, wherein the display module (140) comprises a linear polarizer (130);
under the condition that the cholesteric liquid crystal layer (110) is electrified, display light emitted by the display module (140) sequentially penetrates through the quarter-wave plate (120) and the cholesteric liquid crystal layer (110) so that the display assembly (100) can display functions;
under the condition that the cholesteric liquid crystal layer (110) is powered off, display light emitted by the display module (140) is transmitted through the quarter-wave plate (120) and is reflected on the side, facing the quarter-wave plate (120), of the cholesteric liquid crystal layer (110), and ambient light is reflected on the side, facing away from the quarter-wave plate (120), of the cholesteric liquid crystal layer (110).
7. The display assembly (100) according to claim 6, wherein the cholesteric liquid crystal layer (110) comprises a first conductive layer (111), a second conductive layer (112) and a cholesteric liquid crystal system (113) connected between the first conductive layer (111) and the second conductive layer (112);
when the first conductive layer (111) and the second conductive layer (112) are both electrified, the handedness of the circular polarization state generated after the display light emitted by the display module (140) passes through the quarter-wave plate (120) is opposite to the handedness presented by the cholesteric liquid crystal system (113);
when the first conductive layer (111) and the second conductive layer (112) are respectively powered off, the handedness of the circular polarization state generated after the display light emitted by the display module (140) passes through the quarter-wave plate (120) is the same as the handedness presented by the cholesteric liquid crystal system (113).
8. The display assembly (100) of claim 6, wherein the display module (140) is an LCD.
9. A rearview mirror display screen comprising the display assembly (100) of any one of claims 1-5 or the display assembly (100) of any one of claims 6-8, wherein the rearview mirror display screen further comprises: a glass layer (300) and a reflective component (200);
the display assembly (100) and the reflection assembly (200) are both connected with the inner side face of the glass layer (300), the display assembly (100) is located in one side area of the glass layer (300), and the reflection assembly (200) is located in the other side area of the glass layer (300).
10. -rear-view mirror display screen according to claim 9, characterized in that the reflecting component (200) comprises a reflecting layer (210), the reflection band range of the reflecting layer (210) comprising the reflection band range of the cholesteric liquid crystal layer (110).
11. -rear-view mirror display screen according to claim 10, characterized in that the reflective layer (210) is a linearly polarized mirror or a circular polarizer.
12. The rearview mirror display screen of claim 10, wherein the reflective assembly (200) further comprises a light absorbing layer (220), the light absorbing layer (220) is disposed on a side of the reflective layer (210) facing away from the glass layer (300) for absorbing the circularly polarized light transmitted through the reflective layer (210).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210156281.4A CN114217485A (en) | 2022-02-21 | 2022-02-21 | Display assembly and rearview mirror display screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210156281.4A CN114217485A (en) | 2022-02-21 | 2022-02-21 | Display assembly and rearview mirror display screen |
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