Anti-dazzle device and rearview mirror

Abstract

The invention provides an anti-dazzle device and a rearview mirror, and belongs to the technical field of display. The anti-dazzle device comprises a lens unit array, the lens unit array comprises a plurality of lens units arranged in an array mode, each lens unit comprises a liquid crystal layer and driving electrodes located on the two sides of the liquid crystal layer, and the driving electrode on at least one side comprises a plurality of sub-electrodes; the reflecting layer is arranged on the opposite side of the incident side of the lens unit array; the image acquisition assembly is configured to acquire a light intensity signal of incident light of the lens unit array and acquire a human eye position; and the controller is configured to adjust the driving voltage of the driving electrode according to the light intensity signal and / or the human eye position so as to change the optical axis direction of the lens unit. According to the technical scheme, the phenomenon that reflected light with the too strong light intensity signal enters human eyes to cause dizziness can be prevented.

Description

Technical Field

[0001] The invention relates to the field of display technology, in particular to an anti-glare device and a rearview mirror. Background Art

[0002] With the rapid popularization of automobiles in recent years, the driving safety of automobiles has attracted widespread attention. Among the many safety hazards, the excessive light reflected in the rearview mirror (for example, the light from the high beam of the car at night) is particularly noteworthy. The beam of the high beam is very concentrated and has a high brightness. When the driver of the vehicle in front looks at the rearview mirror, he is often affected by the glare and strong light, causing dizziness, partial blind spots or even temporary blindness, and reduced perception of speed and distance, which can easily cause accidents.

[0003] Instant blindness is actually caused by the difference in brightness between the front and back of the human eye. Especially when driving at night, the illumination of the surrounding environment is very low. Under the sudden high-intensity high-beam illumination, the difference in illumination between the front and back is large, which can easily cause instant blindness. Rearview mirrors usually use manual or electric methods to adjust the angle of the rearview mirror so that the reflected light deviates from the human eye. However, such an operation takes too long to react to light with too high a light intensity signal, and some reflected light that can easily cause dizziness to the human eye will still enter the human eye, posing a safety hazard. Summary of the invention

[0004] The embodiments of the present invention provide an anti-glare device and a rearview mirror, which can prevent reflected light with an excessively strong light intensity signal from entering human eyes and causing dizziness.

[0005] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] In one aspect, an anti-glare device is provided, the anti-glare device comprising:

[0007] A lens unit array, comprising a plurality of lens units arranged in an array, each of the lens units comprising a liquid crystal layer and driving electrodes located on both sides of the liquid crystal layer, and the driving electrode on at least one side comprises a plurality of sub-electrodes;

[0008] A reflective layer, disposed on the opposite side of the lens unit array to the light incident side;

[0009] An image acquisition component configured to acquire a light intensity signal of the incident light of the lens unit array and to acquire a human eye position;

[0010] The controller is configured to adjust the driving voltage of the driving electrode according to the light intensity signal and / or the position of the human eye to change the optical axis direction of the lens unit.

[0011] In some embodiments, the driving electrode includes a first driving electrode and a second driving electrode respectively located on both sides of the liquid crystal layer, and the first driving electrode is circular; the second driving electrode includes a plurality of mutually independent arc sub-electrodes, and the plurality of mutually independent arc sub-electrodes form at least one circular ring, and the first driving electrode is located in the area defined by the circular ring.

[0012] In some embodiments, when the multiple independent arc-shaped sub-electrodes form multiple circular rings, the multiple circular rings are nested in sequence.

[0013] In some embodiments, the second driving electrode is divided into a plurality of sub-regions, and each of the sub-regions includes an equal number of arc-shaped sub-electrodes.

[0014] In some embodiments, the driving electrode includes a first driving electrode and a second driving electrode respectively located on both sides of the liquid crystal layer, the first driving electrode is a whole layer, the second driving electrode includes a plurality of mutually independent sub-electrodes, the plurality of sub-electrodes include a plurality of fan-shaped first sub-electrodes and a plurality of arc-shaped second sub-electrodes, the plurality of fan-shaped first sub-electrodes can form a circle, the plurality of arc-shaped second sub-electrodes form a plurality of circular rings nested in sequence, and the circle is located in the area defined by the circular ring.

[0015] In some embodiments, the second driving electrode is divided into a plurality of sub-regions, each of the sub-regions includes an equal number of sector-shaped first sub-electrodes, and each of the sub-regions includes an equal number of arc-shaped second sub-electrodes.

[0016] In some embodiments, the anti-glare device has a plurality of regions, each of which is provided with at least one lens unit, and the optical axis of the lens unit in each region can be changed independently of the lens units in other regions.

[0017] In some embodiments, the controller is configured to determine whether the light intensity signal of the lens unit in each area is greater than a threshold value. If the light intensity signal reaches the threshold value, the controller adjusts the driving voltage of the sub-electrode in the area to change the optical axis direction of the lens unit in the area.

[0018] In some embodiments, the controller is configured to determine whether the light intensity signal of the lens unit of each area is greater than a threshold value, and determine whether the human eye position is located on the path of the reflected light of the lens unit in the area; if the light intensity signal reaches the threshold value, and the human eye position is located on the path of the reflected light, the controller controls the change of the optical axis direction of the lens unit in the area; if the light intensity signal does not reach the threshold value, and / or the human eye position is not located on the path of the reflected light, the controller does not apply a driving voltage to the driving electrode.

[0019] In some embodiments, the controller is configured to determine whether the light intensity signal of the lens unit of each area is greater than a threshold value, and determine whether the human eye position is located on the path of the reflected light of the lens unit in the area; if the light intensity signal reaches the threshold value, and the human eye position is located on the path of the reflected light, the controller controls the optical axis direction of the lens unit in the area to change;

[0020] If the light intensity signal reaches the threshold value and the position of the human eye is not on the path of the reflected light, determine whether the position of the human eye will be on the path of the changed reflected light if the first driving voltage is applied to the multiple sub-electrodes to change the optical axis of the lens unit; if so, apply the second driving voltage to the multiple sub-electrodes to change the optical axis of the lens unit so that the position of the human eye is not on the path of the changed reflected light; if not, apply the first driving voltage to the multiple sub-electrodes to change the optical axis of the lens unit; the first driving voltage is not equal to the second driving voltage; if the light intensity signal does not reach the threshold value, the controller does not apply the driving voltage to the driving electrode.

[0021] An embodiment of the present invention further provides a rearview mirror, which includes the anti-glare device as described above.

[0022] In some embodiments, the rearview mirror further includes an outer frame and a protective layer, and at least a portion of the anti-glare device is fixed inside a region enclosed by the protective layer and the outer frame.

[0023] In some embodiments, the protective layer is closer to the incident light direction than the outer frame, and at least a portion of a surface of the outer frame that is disposed opposite to the protective layer forms the reflective layer.

[0024] In some embodiments, the protective layer is made of a transparent material.

[0025] The embodiments of the present invention have the following beneficial effects:

[0026] In the above scheme, it is possible to control whether to adjust the driving voltage applied to the driving electrode according to the light intensity signal collected by the image acquisition component and the position of the human eye to change the optical axis of the lens unit. In this way, when the light intensity signal of the incident light of the lens unit is too strong, or the position of the human eye is located on the path of the reflected light of the lens unit, the optical axis of the lens unit can be adjusted to change the path of the reflected light, so that the reflected light can deviate from the human eye, thereby preventing the reflected light with an excessively strong light intensity signal from entering the human eye and causing dizziness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of a reflective anti-glare rearview mirror;

[0028] Figure 2 is a schematic diagram of an electrochromic anti-glare rearview mirror;

[0029] Figure 3 is a schematic diagram of an anti-glare device according to an embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of changes in the optical axis of a lens unit according to an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of changing the optical axis of region A according to an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of changing the optical axis of region B according to an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of changing the optical axis of region C according to an embodiment of the present invention;

[0034] Figure 8 is a schematic cross-sectional view of a lens unit according to an embodiment of the present invention;

[0035] Fig. 9 and Fig.10 is a schematic plan view of a second driving electrode according to an embodiment of the present invention;

[0036] Fig.11 is a schematic diagram of the focus of the lens unit according to an embodiment of the present invention;

[0037] Fig.12 is a cross-sectional schematic diagram of a lens unit according to another embodiment of the present invention;

[0038] Fig.13 FIG. 4 is a schematic plan view of a second driving electrode according to another embodiment of the present invention.

[0039] Reference numerals

[0040] 100 Reflective anti-glare rearview mirror

[0041] 101 Mirror Reflection Part

[0042] 102 Transflective part

[0043] 200 Electrochromic anti-glare rearview mirror

[0044] 201 Reflection layer

[0045] 202 Conductive layer

[0046] 203 Color Change Layer

[0047] 204 Transparent Layer

[0048] 400 eyes

[0049] 401 Protection Layer

[0050] 402 lens unit array

[0051] 403 Reflection layer

[0052] 507 First Base

[0053] 506 first driving electrode

[0054] 505 first orientation layer

[0055] 504 Liquid crystal layer

[0056] 503 Second orientation layer

[0057] 502 second driving electrode

[0058] 501 Second Base

[0059] 5021 Arc sub-electrode

[0060] 5022 fan-shaped first sub-electrode

[0061] 5023 Arc-shaped second sub-electrode DETAILED DESCRIPTION

[0062] In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0063] In the related art, in order to achieve the anti-glare of the rearview mirror, a reflective anti-glare rearview mirror, an electrochromic anti-glare rearview mirror and a light-absorbing anti-glare rearview mirror are used. Figure 1 It is a schematic diagram of a reflective anti-glare rearview mirror 100, which is divided into a mirror reflection part 101 with a higher reflectivity and a semi-transparent reflection part 102 with a lower reflectivity. When the rearview mirror is adjusted from the mirror reflection part 101 to the semi-transparent reflection part 102 by adjusting the angle, the light entering the human eye is reduced. This technology generally requires the driver to adjust the angle of the rearview mirror by himself, and the reaction time to strong glare is longer. Figure 2 It is a schematic diagram of an electrochromic anti-glare rearview mirror 200, wherein 201 is a reflective layer, 202 is a conductive layer, 203 is a color-changing layer, and 204 is a transparent layer. A photoelectric sensor accessory is added. When the rearview mirror is exposed to strong light, the photoelectric sensor senses the strong light and controls the middle color-changing layer 203 to change color, automatically reducing the light transmittance. However, electrochromism usually takes several seconds to respond, and the slow reaction time to strong light affects the anti-glare effect. The light-absorbing anti-glare rearview mirror uses the principle of sunglasses or sunglasses to filter out strong light, but because it filters out more light, it will cause unclear observation of other objects other than strong light at night, which is not conducive to driving safety.

[0064] The embodiments of the present invention provide an anti-glare device and a rearview mirror, which can prevent reflected light with too strong a light intensity signal from entering the human eye and causing dizziness. The rearview mirror referred to here can be a tool installed on a vehicle such as a car or a bicycle to obtain external rear, side and bottom information. Taking a car as an example, the rearview mirror can be an inner rearview mirror for obtaining rear information of the car, an outer rearview mirror for obtaining side information of the car, and a lower mirror for obtaining lower information of the car. When the rear vehicle uses high beam lights, or other conditions make the light intensity signal of the incident light behind the vehicle too strong, the reflected light of the outer rearview mirror and the inner rearview mirror can easily cause dizziness to the human eye; when the light intensity signal of the incident light reflected from the ground is too high, the reflected light of the lower mirror can easily cause dizziness to the human eye.

[0065] An embodiment of the present invention provides an anti-glare device, such as Figure 3 As shown, the anti-glare device comprises:

[0066] The lens unit array 402 includes a plurality of lens units arranged in an array, each of the lens units includes a liquid crystal layer and a driving electrode located on both sides of the liquid crystal layer, the driving electrode on at least one side includes a plurality of sub-electrodes, and the driving electrode is configured to drive the liquid crystal molecules in the liquid crystal layer to change their positions so as to deflect the optical axis of the lens unit. In this embodiment, the driving electrode on one side of the liquid crystal molecule includes a plurality of sub-electrodes to form a second driving electrode, and the driving electrode on the other side serves as a first driving electrode. By adjusting the driving voltage of the plurality of sub-electrodes of the first driving electrode and the second driving electrode, the distribution of the vertical electric field between the driving electrodes on both sides can be regulated, thereby changing the arrangement of the liquid crystal molecules. Specifically, when the driving voltage is applied to the sub-electrodes of the first driving electrode and the second driving electrode, the driving voltage is controlled so that a vertical electric field is formed between the second driving electrode and the first driving electrode, and under the action of the vertical electric field, the liquid crystal molecules in the corresponding area of ​​the liquid crystal layer are deflected, thereby causing the refractive index of the portion of the liquid crystal layer located in the area to change. In this way, by adjusting the driving voltages on the multiple sub-electrodes of the first driving electrode and the second driving electrode (for example, adjusting the driving voltage difference between any two of them), the distribution of the vertical electric field can be regulated, thereby adjusting the deflection of the liquid crystal molecules in each area of ​​the liquid crystal layer, and then adjusting the refractive index, that is, the refractive index distribution of the liquid crystal layer can be controlled, so that the liquid crystal layer can form a liquid crystal lens.

[0067] The reflective layer 403 is disposed on the opposite side of the lens unit array to the light incident side, and the lens unit is disposed on the side of the reflective layer 403 close to the incident light. The reflective layer 403 is disposed on the opposite side of the incident side of the lens unit and is configured to reflect the incident light that passes through the lens unit. Figure 4As shown, the second driving electrode includes a plurality of sub-electrodes: Q1, Q2 and Q3. Different driving voltages are applied to the liquid crystal molecules through the plurality of sub-electrodes, so that the position of the liquid crystal molecules changes and the optical axis of the lens unit changes. L is the original optical axis. By applying different driving voltages to the plurality of sub-electrodes, the optical axis can deviate from the original optical axis L to form a new optical axis H, where H is the new optical axis after the change.

[0068] The image acquisition component is configured to acquire the light intensity signal of the incident light of the lens unit array and the position of the human eye. The image acquisition component is not shown in the figure. The image acquisition component can be a camera, an image sensor unit, etc. In this embodiment, the image acquisition component is used to acquire the light intensity signal of the incident light of the lens unit array and the position of the human eye, which can simplify the structure of the anti-glare device. The position of the human eye is specifically the position coordinate of the driver's human eye. In this embodiment, the image acquisition component can acquire the position of the driver's human eye in real time during driving, and can also acquire the position of the driver's human eye at the beginning of driving; the image acquisition component can sense the light intensity of the incident light of the anti-glare device in real time, and can also acquire the incident angle of the incident light;

[0069] The controller is configured to adjust the driving voltage of the driving electrode according to the light intensity signal and / or the position of the human eye to change the optical axis direction of the lens unit.

[0070] In this embodiment, it is possible to control whether to adjust the driving voltage applied to the driving electrode according to the light intensity signal collected by the image acquisition component and the position of the human eye to change the optical axis of the lens unit. In this way, when the light intensity signal of the incident light of the lens unit is too strong, or the position of the human eye is located on the path of the reflected light of the lens unit, the optical axis of the lens unit can be adjusted to change the path of the reflected light, so that the reflected light can deviate from the human eye, thereby preventing the reflected light with an excessively strong light intensity signal from entering the human eye and causing dizziness.

[0071] In some embodiments, the anti-glare device has multiple regions, each of which is provided with at least one lens unit, and the optical axis of the lens unit in each region can be changed independently of the lens units in other regions. Figure 5-Figure 7As shown, the anti-glare device has at least a first area A, a second area B and a third area C. In this way, the anti-glare device can be controlled in different areas. In order to simplify the structure of the anti-glare device, the lens units in different areas can share the same first drive electrode, and the controller can apply different drive voltages to the sub-electrodes of the second drive electrodes of the lens units in different areas to change the optical axis directions of the lens units in different areas. In this embodiment, the range of each area can be pre-defined, and the range of each area can also be automatically adjusted according to the eye position of the driver. For example, after the driver adjusts the seat and sits down, the image acquisition component captures the eye position and automatically adjusts the range of each area according to the eye position.

[0072] In this embodiment, the controller can control the optical axis direction of the lens unit only according to the light intensity signal. The controller is configured to determine whether the light intensity signal of the lens unit in each area is greater than a threshold value. If the light intensity signal reaches the threshold value, the controller adjusts the driving voltage of the sub-electrode in the area to change the optical axis direction of the lens unit in the area. For example, when the light intensity signal of the incident light in any area of ​​the anti-glare device is too strong, the optical axis of the lens unit in the area can be changed so that the reflected light in the area deviates from the human eye 400, while the incident light in other areas can still be reflected normally into the human eye 400, so that the user can see the rear information clearly. If the light intensity signal of the incident light in the area of ​​the anti-glare device is not greater than the threshold value, the controller does not apply the driving voltage to the driving electrode, and the reflected light moves away from the lens unit along the original path. In this way, it is prevented that the incident light with too strong light intensity signal enters the human eye and causes dizziness. Among them, the user can adjust the threshold value according to the actual situation. In addition, in this embodiment, the driving voltage of the first driving electrode can always be a fixed value, and the driving voltage of the sub-electrode of the second driving electrode can be changed under the control of the controller.

[0073] When the controller detects that the light intensity signal in a certain area is too strong, it applies a driving voltage to the second driving electrode corresponding to the lens unit in the area, so that the optical axis of the lens unit in the area changes. For example, in this case, the optical axis of the lens unit can be changed so that the reflected light propagates in the direction pointing to the roof of the car or in other directions away from the driver (such as the direction of the front passenger seat), so that in most cases, the driver's eyes can be avoided, preventing the driver from dizziness or blindness, thereby ensuring driving safety.

[0074] In some embodiments, the controller can control whether to change the optical axis direction of the lens unit of the corresponding area according to the human eye position and the incident light intensity signal of each area, so that the control is more accurate. The controller is configured to determine whether the light intensity signal of the lens unit of each area is greater than a threshold value, and determine whether the human eye position is located on the path of the reflected light of the lens unit in the area. If the light intensity signal reaches the threshold value and the human eye position is located on the path of the reflected light, the controller controls the optical axis direction of the lens unit in the area to change; if the light intensity signal does not reach the threshold value, and / or the human eye position is not located on the path of the reflected light, the controller does not apply a driving voltage to the driving electrode. The controller can obtain the reflection path of the reflected light, that is, the reflection vector, according to the incident angle of the incident light. Then the controller determines whether the position coordinates of the human eye are located on the reflection vector of a certain area. If the position coordinates of the human eye are located on the reflection vector of a certain area, it means that the reflected light of the area will enter the human eye, that is, the human eye position is located on the reflected light path of the lens unit in the area, then the optical axis of the lens unit in the area can be changed so that the reflected light in the area deviates from the human eye 400. If the coordinates of the human eye are not on the reflection vector, it means that the reflected light will not enter the human eye, that is, the human eye is not located in the reflected light path of the lens unit in this area. In this way, it can be determined whether the reflected light with a light intensity signal that is too strong corresponding to the incident light with a light intensity signal greater than the threshold will enter the human eye, thereby causing glare and blindness to the driver.

[0075] If the light intensity signal reaches the threshold value, and the position of the human eye is located in the path of the reflected light, the controller controls the sub-electrode of the second driving electrode in the area to change the driving voltage, thereby changing the position of the liquid crystal molecules and causing the optical axis of the lens unit to swing. If the light intensity signal does not reach the threshold value, the controller does not apply the driving voltage to the driving electrode, and the reflected light still leaves the lens unit along the original path. When the anti-glare device enters the working state, the image acquisition component can capture the driver's eye position in real time. Generally, when the car starts to drive, it is considered that the anti-glare device enters the working state. Of course, it is also possible that before driving, the image acquisition component obtains the driver's eye position and uses the eye position as the eye position used by the controller in this working state.

[0076] Specifically, the controller may have multiple control methods for changing the optical axis. Figure 5 As shown, the light intensity signal of the incident light in area A is greater than the threshold, and the path of the original reflected light corresponding to the incident light in area A passes through the human eye 400 ( Figure 5 The dotted line light path in the figure represents the path of the original reflected light in area A). The controller controls the sub-electrodes of the second driving electrodes in the area (area A) to change the driving voltage to change the position of the liquid crystal molecules, thereby causing the optical axis of the lens unit to swing. At this time, the path of the reflected light changes and deviates from the human eye, such as Figure 5If the light intensity signal of the incident light in area A is not greater than the threshold, and / or the human eye is not located in the path of the reflected light (such as Figure 6 Area B in the middle left part and Figure 7 When the controller does not apply a driving voltage to the driving electrode, the reflected light moves away from the lens unit along the original optical path.

[0077] Specifically, Figure 5 As shown, the controller can apply a driving voltage only to the second driving electrode corresponding to the lens unit in area A to change the optical axis of the lens unit in area A, so that the path of the reflected light of the lens unit in area A changes, deflecting from the dotted line optical path position to the solid line optical path position, and even deviating from the human eye 400.

[0078] Alternatively, the controller changes the optical axis of the lens unit in any area where the light intensity signal of the incident light is greater than the threshold. In other words, when the light intensity signal of the incident light of the lens unit in any area is too strong, that is, reaches the threshold, the optical axis of the lens unit in the area is changed regardless of whether the human eye position is located in the original path of the original reflected light of the lens unit in the area.

[0079] In some embodiments, the controller is configured to determine whether the light intensity signal of the lens unit of each area is greater than a threshold value, and determine whether the human eye position is located on the path of the reflected light of the lens unit in the area; if the light intensity signal reaches the threshold value, and the human eye position is located on the path of the reflected light, the controller controls the optical axis direction of the lens unit in the area to change;

[0080] If the light intensity signal reaches the threshold value, and the position of the human eye is not located on the path of the reflected light, determine whether the position of the human eye will be located on the path of the changed reflected light if the first driving voltage is applied to the multiple sub-electrodes to change the optical axis of the lens unit; if so, apply the second driving voltage to the multiple sub-electrodes to change the optical axis of the lens unit so that the position of the human eye is not located on the path of the changed reflected light; if not, apply the first driving voltage to the multiple sub-electrodes to change the optical axis of the lens unit; the first driving voltage is not equal to the second driving voltage; if the light intensity signal does not reach the threshold value, the controller does not apply the driving voltage to the driving electrode. The first driving voltage and the second driving voltage are a combination of multiple numerical values. For example, the second driving electrode includes multiple sub-electrodes, the first driving voltage can be the numerical value of the driving voltage applied to the multiple sub-electrodes, and the second driving voltage can be the numerical value of the driving voltage applied to the multiple sub-electrodes.

[0081] Take the second driving electrode including three sub-electrodes as an example. Figure 5-Figure 7As shown, the controller can apply driving voltages VA1, VA2 and VA3 to the three sub-electrodes of the second driving electrode corresponding to the lens unit in the A region to change the position of the liquid crystal molecules in the A region, so that the optical axis of the lens unit changes, and the path of the reflected light of the lens unit in the A region changes, so as to deviate from the human eye 400 (as shown in FIG. Figure 5 As shown in FIG. 1 ). VA1, VA2 and VA3 are first driving voltages. The controller determines that if driving voltages VA1, VA2 and VA3 are applied to the three sub-electrodes of the second driving electrode corresponding to the lens unit in area B, the excessively strong reflected light in area B will pass through the human eye (such as Figure 6 Therefore, the controller applies driving voltages VB1, VB2 and VB3 to the three sub-electrodes of the second driving electrode corresponding to the lens unit in area B, respectively. The driving voltages VB1, VB2 and VB3 are different from the driving voltages VA1, VA2 and VA3, so that the reflected light deviates from the human eye by 400 (as shown in FIG. Figure 6 VB1, VB2 and VB3 are the second driving voltages. In this embodiment, the controller further determines that if the three sub-electrodes of the second driving electrode corresponding to the lens unit in the C area are respectively applied with driving voltages VB1, VB2 and VB3, the excessively strong reflected light in the C area will pass through the human eye 400 (such as Figure 7 Therefore, the controller applies driving voltages VC1, VC2 and VC3 to the three sub-electrodes of the second driving electrode corresponding to the lens unit in the C area respectively. The driving voltages VC1, VC2 and VC3 are different from the driving voltages VB1, VB2 and VB3, so that the reflected light deviates from the human eye 400 (as shown in FIG. Figure 7 Of course, if the controller applies driving voltages VA1, VA2 and VA3 to the three sub-electrodes of the second driving electrode corresponding to the lens unit in the C region respectively, the reflected light in the C region will not pass through the human eye 400, and the driving voltages VA1, VA2 and VA3 may also be applied to the three sub-electrodes of the second driving electrode corresponding to the lens unit in the C region respectively.

[0082] In this embodiment, the second driving electrode is not limited to including three sub-electrodes, but may also include more sub-electrodes, and these sub-electrodes are distributed in different sub-regions. The focus of the liquid crystal lens can be adjusted by controlling the driving voltage on the sub-electrodes.

[0083] like Figure 8 and Fig. 9As shown, in a specific embodiment, the lens unit includes a first substrate 507, a first driving electrode 506, a first orientation layer 505, a liquid crystal layer 504, a second orientation layer 503, a second driving electrode 502 and a second substrate 501, wherein the first substrate 507 and the second substrate 501 are made of transparent substrates, such as a quartz substrate or polyimide; the first driving electrode 506 and the second driving electrode 502 are made of transparent conductive materials, such as ITO or IZO.

[0084] In this embodiment, Fig. 9 and Fig.10 As shown, the first driving electrode 506 may be circular; the second driving electrode 502 includes a plurality of mutually independent arc-shaped sub-electrodes 5021, the plurality of mutually independent arc-shaped sub-electrodes 5021 forming at least one circular ring, and the first driving electrode 506 is located in the area defined by the circular ring. In this embodiment, the plurality of mutually independent arc-shaped sub-electrodes 5021 may form a plurality of circular rings, such as Fig. 9 As shown, a plurality of mutually independent arc-shaped sub-electrodes 5021 may also form only one circular ring, such as Fig.10 As shown. Fig. 9 As shown, when the multiple independent arc-shaped sub-electrodes 5021 form multiple circular rings, the multiple circular rings are nested in sequence. The second driving electrode can be divided into multiple sub-regions, and each sub-region includes an equal number of arc-shaped sub-electrodes 5021.

[0085] In some embodiments, each of the circular rings may be composed of four arc-shaped sub-electrodes 5021. Of course, each of the circular rings is not limited to being composed of four arc-shaped sub-electrodes 5021, and may also include fewer arc-shaped sub-electrodes 5021, or more arc-shaped sub-electrodes 5021. However, the number of arc-shaped sub-electrodes included in each circular ring should be the same, and the gaps between the arc-shaped sub-electrodes 5021 divide the second driving electrode into multiple sub-areas. Fig. 9 and Fig.10 As shown, the second driving electrode includes four sub-areas as shown in the dotted box: S1, S2, S3, and S4.

[0086] by Fig.10 For example, a driving voltage V0 is applied to the first driving electrode 506, and driving voltages V1, V2, V3, and V4 are applied to the arc-shaped sub-electrodes of the four sub-regions of the second driving electrode, respectively. When V1=V2=V3=V4, the focal position of the lens unit is at the center position. When the driving voltage of one of the sub-regions is changed to be unequal to the driving voltages of the other three sub-regions, the focus of the lens unit will shift, and the focus of the lens unit moves to the sub-region with lower driving voltage on the focal plane.

[0087] Fig.11is a schematic diagram of the focus position. When the driving voltages of the four sub-areas are equal, the focus is located at the center of the lens unit, and the coordinate positions (Ox, Oy) are: Ox = r 2 / (2*Δn*d), Oy=r-Δr, where r is the equivalent radius of the liquid crystal lens when the driving voltages of the four sub-regions are equal, Δr is the equivalent radius of the liquid crystal lens after the driving voltage of one of the sub-regions is changed, Δn is the birefringence, and d is the thickness of the liquid crystal box. When the driving voltage of the sub-region changes, r and Δn change accordingly, and the focal position of the lens unit also moves. Specifically, when changing the focal position of the lens unit, a model of the relationship between the driving voltage and the refractive index of each sub-region can be established, and the liquid crystal birefringence and lens radius can be calculated according to the target focal position. Then, the required driving voltage is obtained from the model of the relationship between the driving voltage and the refractive index, and finally, the controller is used to input the corresponding driving voltage to move the focal position to the target focal point.

[0088] In another specific embodiment, the liquid crystal lens adopts a structure similar to that of a Fresnel lens. Compared with a traditional spherical lens, the Fresnel liquid crystal lens can increase the effective diameter of the lens, reduce the thickness of the lens box, and increase the response speed. Fig.12 and Fig.13 As shown, the lens unit includes a first substrate 507, a first driving electrode 506, a first orientation layer 505, a liquid crystal layer 504, a second orientation layer 503, a second driving electrode 502 and a second substrate 501, wherein the first substrate 507 and the second substrate 501 are made of transparent substrates, such as a quartz substrate or polyimide; the first driving electrode 506 and the second driving electrode 502 are made of transparent conductive materials, such as ITO or IZO.

[0089] In this embodiment, the first driving electrode 506 can be a whole layer, and the first driving electrodes 506 of different lens units can be connected as a whole; the second driving electrode 502 includes a plurality of independent sub-electrodes, and the plurality of sub-electrodes include a plurality of fan-shaped first sub-electrodes 5022 and a plurality of arc-shaped second sub-electrodes 5023, and the plurality of fan-shaped first sub-electrodes 5022 form a circle, and the plurality of arc-shaped second sub-electrodes 5023 form a plurality of circular rings nested in sequence, and the circle is located in the area defined by the circular ring.

[0090] In some embodiments, each of the circular rings may be composed of four arc-shaped sub-electrodes 5021. Of course, each of the circular rings is not limited to being composed of four arc-shaped sub-electrodes 5021, and may also include fewer arc-shaped sub-electrodes 5021, or more arc-shaped sub-electrodes 5021. However, the number of arc-shaped sub-electrodes included in each circular ring should be the same, and the gap between the fan-shaped first sub-electrode 5022 and the arc-shaped second sub-electrode 5023 divides the second driving electrode into a plurality of sub-regions, and each sub-region includes an equal number of fan-shaped first sub-electrodes 5022, and each sub-region includes an equal number of arc-shaped second sub-electrodes 5023. Fig.13 As shown, the second driving electrode includes four sub-areas as shown in the dotted box: S1, S2, S3, and S4.

[0091] Each sub-region may include n sub-electrodes, and a different driving voltage is applied to each sub-electrode, such as Fig.13 As shown, driving voltages V11, V21, ..., V1n are applied to the sub-electrodes of the first sub-region S1 respectively; and by analogy, driving voltages V41, V42, ..., V4n are applied to the sub-electrodes of the fourth sub-region respectively. A driving voltage V0 is applied to the first driving electrode, and a similar Fresnel lens effect can be achieved by setting the voltage difference between V11 to V4n and V0. When the driving voltages of the sub-electrodes corresponding to the four sub-regions are equal, such as V11 = V21 = V31 = V41, V12 = V22 = V32 = V42, ..., V1n = V2n = V3n = V4n, the focal position of the lens unit is at the center position. When the driving voltage of one of the sub-regions is changed to be unequal to the driving voltage of the other three sub-regions, the focus of the lens unit will shift, and the focus of the lens unit moves to the sub-region with lower driving voltage on the focal plane.

[0092] Fig.11 is a schematic diagram of the focus position. When the driving voltages of the four sub-areas are equal, the focus is located at the center of the lens unit, and the coordinate positions (Ox, Oy) are: Ox = r 2 / (2*Δn*d), Oy=r-Δr, where r is the equivalent radius of the liquid crystal lens when the driving voltages of the four sub-regions are equal, Δr is the equivalent radius of the liquid crystal lens after the driving voltage of one of the sub-regions is changed, Δn is the birefringence, and d is the thickness of the liquid crystal box. When the driving voltage of the sub-region changes, r and Δn change accordingly, and the focal position of the lens unit also moves. Specifically, when changing the focal position of the lens unit, a model of the relationship between the driving voltage and the refractive index of each sub-region can be established, and the liquid crystal birefringence and lens radius can be calculated according to the target focal position. Then, the required driving voltage is obtained from the model of the relationship between the driving voltage and the refractive index, and finally, the controller is used to input the corresponding driving voltage to move the focal position to the target focal point.

[0093] The embodiment of the present invention also provides a rearview mirror, such as Figure 3 As shown, the rearview mirror includes the anti-glare device as described above, and the rearview mirror also includes an outer frame 404 and a protective layer 401 , and at least a portion of the anti-glare device is fixed inside the area enclosed by the protective layer 401 and the outer frame 404 .

[0094] like Figure 3 As shown, the outer frame 404 of the rearview mirror is concave inwardly, the protective layer 401 is fixedly arranged on the concave surface of the outer frame 404, and at least part of the anti-glare device is fixedly arranged inside the area surrounded by the protective layer 401 and the outer frame 404. Figure 3 As shown, the lens unit and the reflective layer 403 are fixed inside the protective layer 401 and the outer frame 404. Through such a configuration, the outer frame 404 and the protective layer 401 isolate the anti-glare device from the outside world, protect the lens unit, and isolate the interference of external impurities on the driving electrode, making the detection and control process more accurate. At the same time, the anti-glare device is fixed and protected. Of course, in other embodiments, the rearview mirror may not be provided with the outer frame 404 and the protective layer 401, and only the anti-glare device forms the rearview mirror or at least part of the rearview mirror.

[0095] In this embodiment, the protective layer 401 and the outer frame 404 are two different components. Of course, the reflective layer 403 may not be provided separately, and at least a portion of the surface of the outer frame 404 opposite to the protective layer 401 may form the reflective layer 403. By such a configuration, the process may be simplified or the thickness of the rearview mirror may be reduced.

[0096] Furthermore, the protective layer 401 is made of a transparent material. This arrangement prevents the protective layer 401 from changing the human eye's judgment of light. When installing the rearview mirror, the protective layer 401 is placed closer to the direction of the incident light than the outer frame 404, so that the incident light can enter the lens unit through the protective layer 401, and then be reflected by the reflective layer 403 out of the rearview mirror and into the human eye.

[0097] Compared with the existing reflective anti-glare rearview mirror 100, the rearview mirror of this embodiment has a faster response, no manual adjustment is required, and is more accurate. Compared with the existing electrochromic anti-glare rearview mirror 200, the rearview mirror of this embodiment is thinner and lighter, and has a faster response time, which is beneficial to driving safety. Compared with the existing light-absorbing anti-glare rearview mirror, the rearview mirror of this embodiment has brighter light, which is beneficial to driving safety.

[0098] In addition, the anti-glare device of this embodiment can be applied not only to rearview mirrors, but also to other reflective devices, such as corner mirrors on the road, makeup mirrors, etc. When the corner mirror includes the anti-glare device described above, the anti-glare device in the corner mirror can change the optical axis of the lens unit, and reflect the incident light with an excessively strong light intensity signal upward to a height that the driver's eyes cannot usually reach, so that the drivers of passing vehicles will not feel dizzy due to the light with an excessively strong light intensity signal entering the human eyes, thereby ensuring the safety of passing vehicles.

[0099] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiments, since they are basically similar to the product embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the product embodiments.

[0100] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0101] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “under” another element, it can be “directly on” or “under” the other element or intervening elements may be present.

[0102] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0103] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An anti-glare device, characterized in that: The anti-glare device comprises: A lens unit array, comprising a plurality of lens units arranged in an array, each of the lens units comprising a liquid crystal layer and driving electrodes located on both sides of the liquid crystal layer, and the driving electrode on at least one side comprises a plurality of sub-electrodes; A reflective layer, disposed on the opposite side of the lens unit array to the light incident side; An image acquisition component configured to acquire a light intensity signal of the incident light of the lens unit array and to acquire a human eye position; The controller is configured to adjust the driving voltage of the driving electrode according to the light intensity signal and / or the position of the human eye to change the optical axis direction of the lens unit.

2. The anti-glare device according to claim 1, characterized in that: The driving electrode includes a first driving electrode and a second driving electrode respectively located on both sides of the liquid crystal layer, the first driving electrode is circular; the second driving electrode includes a plurality of mutually independent arc sub-electrodes, the plurality of mutually independent arc sub-electrodes form at least one circular ring, and the first driving electrode is located in the area defined by the circular ring.

3. The anti-glare device according to claim 2, characterized in that: When the multiple independent arc-shaped sub-electrodes form multiple circular rings, the multiple circular rings are nested in sequence.

4. The anti-glare device according to claim 3, characterized in that: The second driving electrode is divided into a plurality of sub-regions, and each of the sub-regions includes an equal number of arc-shaped sub-electrodes.

5. The anti-glare device according to claim 1, characterized in that: The driving electrode includes a first driving electrode and a second driving electrode respectively located on both sides of the liquid crystal layer, the first driving electrode is a whole layer, the second driving electrode includes a plurality of mutually independent sub-electrodes, the plurality of sub-electrodes include a plurality of fan-shaped first sub-electrodes and a plurality of arc-shaped second sub-electrodes, the plurality of fan-shaped first sub-electrodes can form a circle, the plurality of arc-shaped second sub-electrodes form a plurality of circular rings nested in sequence, and the circle is located in the area defined by the circular ring.

6. The anti-glare device according to claim 5, characterized in that: The second driving electrode is divided into a plurality of sub-regions, each of the sub-regions includes an equal number of sector-shaped first sub-electrodes, and each of the sub-regions includes an equal number of arc-shaped second sub-electrodes.

7. The anti-glare device according to any one of claims 1 to 6, characterized in that: The anti-glare device has a plurality of regions, each of which is provided with at least one lens unit, and the optical axis of the lens unit in each region can be changed independently of the lens units in other regions.

8. The anti-glare device according to claim 7, characterized in that: The controller is configured to determine whether the light intensity signal of the lens unit in each area is greater than a threshold value. If the light intensity signal reaches the threshold value, the controller adjusts the driving voltage of the sub-electrode in the area to change the optical axis direction of the lens unit in the area.

9. The anti-glare device according to claim 7, characterized in that: The controller is configured to determine whether the light intensity signal of the lens unit of each area is greater than a threshold value, and determine whether the human eye position is located on the path of the reflected light of the lens unit in the area. If the light intensity signal reaches the threshold value and the human eye position is located on the path of the reflected light, the controller controls the optical axis direction of the lens unit in the area to change; If the light intensity signal does not reach the threshold value, and / or the human eye is not located on the path of the reflected light, the controller does not apply the driving voltage to the driving electrode.

10. The anti-glare device according to claim 7, characterized in that: The controller is configured to determine whether the light intensity signal of the lens unit of each area is greater than a threshold value, and determine whether the human eye position is located on the path of the reflected light of the lens unit in the area; if the light intensity signal reaches the threshold value, and the human eye position is located on the path of the reflected light, the controller controls the optical axis direction of the lens unit in the area to change; If the light intensity signal reaches the threshold value and the human eye position is not located on the path of the reflected light, determining whether the human eye position is located on the changed path of the reflected light if the optical axis of the lens unit is changed by applying a first driving voltage to the plurality of sub-electrodes; If yes, applying a second driving voltage to the plurality of sub-electrodes to change the optical axis of the lens unit so that the human eye position is not located on the path of the changed reflected light; if no, applying a first driving voltage to the plurality of sub-electrodes to change the optical axis of the lens unit; The first driving voltage is not equal to the second driving voltage; If the light intensity signal does not reach the threshold, the controller does not apply the driving voltage to the driving electrode.

11. A rearview mirror, characterized in that: The rearview mirror comprises an anti-glare device as claimed in any one of claims 1 to 10.

12. The rearview mirror according to claim 11, characterized in that: The rearview mirror further comprises an outer frame and a protective layer, and at least a portion of the anti-glare device is fixed inside a region enclosed by the protective layer and the outer frame.

13. The rearview mirror according to claim 12, characterized in that: The protective layer is closer to the incident light direction than the outer frame, and at least a portion of a surface of the outer frame opposite to the protective layer forms the reflective layer.

14. The rearview mirror according to claim 13, characterized in that The protective layer is made of transparent material.

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