WO2019232915A1

WO2019232915A1 - Automatic anti-glare automotive electronic rearview mirror

Info

Publication number: WO2019232915A1
Application number: PCT/CN2018/099189
Authority: WO
Inventors: 郭建新
Original assignee: 惠州市德赛西威汽车电子股份有限公司
Priority date: 2018-06-08
Filing date: 2018-08-07
Publication date: 2019-12-12
Also published as: CN109278649A; CN109278649B

Abstract

An automatic anti-glare automotive electronic rearview mirror, comprising a housing, a front glass substrate (3) disposed on the housing, a rear glass substrate (5), a front polarizer (2), and a reflective rear polarizer (6). A liquid crystal layer (4) is disposed between the front glass substrate (3) and the rear glass substrate (5). The front polarizer (2) and the rear reflective polarizer (6) are respectively disposed at outer sides of the front glass substrate (3) and the rear glass substrate (5). A glass cover (1) is provided at an outer side of the front polarizer (2). Liquid crystal alignment layers are disposed on opposing sides of the front glass substrate (3) and the rear glass substrate (5), and the liquid crystal layer (4) is located between the liquid crystal alignment layers of the front glass substrate (3) and the rear glass substrate (5). The alignment direction of liquid crystal molecules in the liquid crystal layer (4) of the automatic anti-glare automotive electronic rearview mirror is adjusted by biasing transparent electrically conductive layers of the front glass substrate (3) and the rear glass substrate (5), thereby adjusting the polarization state of incident and reflected light, so as to realize, by means of the front polarizer (2) and the rear reflective polarizer (6), control of the intensity of the reflected light of the rearview mirror, such that the response time of the rearview mirror is greatly reduced, and an improved anti-glare effect is achieved in a timely manner.

Description

Automatic anti-glare automobile electronic rearview mirror

Technical field

The invention relates to the technical field of automobile rearview mirrors, in particular to an automatic anti-glare automobile electronic rearview mirror.

Background technique

With the increasing safety and comfort of automotive products, the development of automatic anti-glare rearview mirror technology has gradually gained market attention.

Generally speaking, the automatic anti-glare rearview mirror installed inside the vehicle (and / or outside the vehicle) adopts an electrochromic technical solution. The structure of the electrochromic lens is formed by filling an electrochromic solution between two pieces of glass having a conductive function. In the normal state, the cathode in the electrochromic solution is in a colorless oxidation state, and the anode is in a yellowish normal state. For example, when the conductive layer is applied with a DC bias voltage, the cathode receives the electrons from the negative electrode of the power supply and becomes a reduced state and changes from a colorless state to blue; the anode changes the electrons released from the positive electrode of the power supply to an oxidation state and changes from a colorless state. Is yellow. When the two colors are mixed, the color visually obtained is dark green. Because the electrochromic solution produces a color change, a light absorption effect is produced, and the reflectance will decrease with the bias voltage, which plays an anti-glare role.

There are several limitations to this technique. First, the response time is slow. Even at room temperature, a cycle of maximum reflection—> minimum reflection—> maximum reflection takes more than ten seconds, and even at low temperature, it can reach 30 seconds. It is difficult to play the role of anti-glare in time. Secondly, electrochromism is due to the electrooxidation-reduction reaction that makes the electrolyte dark, absorbs the incident light, and weakens the reflected light. Therefore, the reflected color changes with the voltage and is not neutral white—> black—> white And between the gray monochrome changes.

Summary of the Invention

In order to overcome the defects described in the prior art, the present invention provides an automatic anti-glare automobile rearview mirror.

To solve the above technical problems, the technical solution of the present invention is as follows:

An automatic anti-glare automobile electronic rear-view mirror includes a casing, a front glass substrate and a rear glass substrate disposed on the casing, a liquid crystal layer is provided between the front glass substrate and the rear glass substrate, and a front polarized light is also included. And a rear-reflection polarizer, the front and rear-reflection polarizers are respectively provided on the outer sides of the front glass substrate and the rear glass substrate, and a glass cover plate is provided on the outer side of the front polarizer; A liquid crystal alignment layer is disposed on opposite sides of the front glass substrate and the rear glass substrate, and the liquid crystal layer is located between the liquid crystal alignment layers of the front glass substrate and the rear glass substrate.

Further, as a preferred technical solution, the front polarizer includes a linear polarizer with high transmittance and neutral color; and a light-absorbing layer is provided on the outside of the rear-reflective polarizer.

Further, as a preferred technical solution, the front glass substrate includes a front glass with a transparent conductive layer, and the rear glass substrate includes a rear glass with a transparent conductive layer.

Further, as a preferred technical solution, the glass cover plate and the front polarizer, the front polarizer and the front glass substrate, and the rear reflective polarizer and the rear glass substrate are all passed through optical glue. Together.

Further, as a preferred technical solution, the arrangement mode of the liquid crystal molecules of the liquid crystal layer includes a vertical alignment mode, and the negative liquid crystal molecules in the liquid crystal molecules of the vertical alignment mode are 88 degrees from the front glass substrate and the rear glass substrate. To 89.5 degrees or -88 degrees to -89.5 degrees, the negative liquid crystal molecules are projected on the front glass substrate and the rear glass substrate by the liquid crystal alignment layer of the front glass substrate and the rear glass substrate The direction is at a 45-degree angle or a -45-degree angle with the transmission axis of the front polarizer, and the optical path difference range of the liquid crystal layer in the vertical alignment mode is 175nm≤Δnd≤375nm or 400nm≤Δnd≤600nm.

Further, as a preferred technical solution, the vertical alignment mode is divided into a normally white mode and a normally black mode according to different angles formed by the transmission axes of the front polarizer and the rear reflection polarizer;

In the normally white mode, the angle formed by the front polarizer and the transmission axis of the rear reflective polarizer is 90 degrees or -90 degrees; the configuration of the rear reflective polarizer is parallel to the front polarized light. The polarized light reflection of the transmission axis of the sheet is polarized light transmission perpendicular to the transmission axis of the front polarizer; the optical path difference of the liquid crystal layer decreases as the bias voltage increases, and the reflectance of the rear-view mirror varies with the polarization. Increase in pressure and decrease;

In the normally black mode, the angle formed by the front polarizer and the transmission axis of the rear reflective polarizer is 0 degrees; the rear reflective polarizer is configured to transmit light parallel to the front polarizer The polarized light transmitted through the axis is reflected by the polarized light perpendicular to the transmission axis of the front polarizer; the optical path difference of the liquid crystal layer decreases as the bias voltage increases, and the reflectance of the rear view mirror increases as the bias voltage increases. Increase.

Further, as a preferred technical solution, the arrangement mode of the liquid crystal molecules of the liquid crystal layer includes a horizontal alignment mode, and the positive liquid crystal molecules in the liquid crystal molecules of the horizontal alignment mode are 0.5 degrees with the front glass substrate and the rear glass substrate. To 2 degrees or -0.5 degrees to -2 degrees, the projection of the positive liquid crystal molecules on the planes of the front glass substrate and the rear glass substrate under the action of the liquid crystal alignment layer of the front glass substrate and the rear glass substrate The direction is at a 45-degree angle or a -45-degree angle with the transmission axis of the front polarizer, and the optical path difference range of the liquid crystal layer in the horizontal alignment mode is 175nm≤Δnd≤375nm or 400nm≤Δnd≤600nm.

Further, as a preferred technical solution, the horizontal alignment mode is divided into a normally white mode and a normally black mode according to different angles formed by the transmission axes of the front polarizer and the rear reflection polarizer;

In the normally white mode, the angle formed by the front polarizer and the transmission axis of the rear reflective polarizer is 0; the configuration of the rear reflection polarizer is perpendicular to the transmission axis of the front polarizer The polarized light reflection is parallel to the transmission axis of the front polarizer. The optical path difference of the liquid crystal layer decreases as the bias voltage increases, and the reflectance of the rearview mirror decreases as the bias voltage increases. small;

In the normally black mode, the angle formed by the front polarizer and the transmission axis of the rear reflective polarizer is 90 degrees or -90 degrees; the configuration of the rear reflective polarizer is parallel to the front polarized light. The polarized light reflection of the transmission axis of the sheet is polarized light transmission perpendicular to the transmission axis of the front polarizer; the optical path difference of the liquid crystal layer decreases as the bias voltage increases, and the reflectance of the rear-view mirror varies with the polarization. The pressure increases.

Further, as a preferred technical solution, the arrangement mode of the liquid crystal molecules in the liquid crystal layer includes a conventional twisted alignment mode, and the positive liquid crystal molecules in the liquid crystal molecules in the conventional twisted alignment mode are 90 degrees from the front glass substrate to the rear glass substrate or -90 degree twist arrangement, the projection of the positive liquid crystal molecules on the front glass substrate plane and the transmission axis of the front polarizer form a 0 degree angle or a 90 degree angle or a -90 degree angle. The optical path difference range of the liquid crystal layer is 375 nm ≦ Δnd ≦ 575 nm or 900 nm ≦ Δnd ≦ 1200 nm.

Further, as a preferred technical solution, the twisted orientation mode is divided into a normally white mode and a normally black mode according to a difference in an angle formed by a transmission axis of the front polarizer and the rear reflection polarizer;

In the normally black mode, the angle formed by the front polarizer and the transmission axis of the rear reflective polarizer is 90 degrees or -90 degrees; the configuration of the rear reflective polarizer is parallel to the front polarizer The polarized light reflection of the transmission axis is transmitted, and the polarized light transmission perpendicular to the transmission axis of the front polarizer is transmitted; the optical path difference of the liquid crystal layer decreases as the bias voltage increases, and the reflectance of the rear-view mirror varies with the bias voltage. Increase.

Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

1. The rearview mirror of the present invention uses the liquid crystal display technology principle of the liquid crystal layer to bias the transparent conductive layers of the front glass substrate and the rear glass substrate to change the alignment direction of the liquid crystal molecules of the liquid crystal layer, thereby adjusting the incident and The polarization state of the reflected light. At the same time, with the participation of the front polarizer and the rear reflective polarizer, the reflected light intensity is controlled; the response time of the rearview mirror is greatly reduced, so that the maximum response time is obtained at room temperature. Reflection—> Minimum reflection—> A cycle of maximum reflection is within 30ms; at low temperature of -40degC, the response time will also be less than 1s; so that the rearview mirror will play a better anti-glare effect in time.

2. The rearview mirror of the present invention adopts the liquid crystal display technology principle of the liquid crystal layer, so that the reflection color of the rearview mirror remains black and white and monochromatic; at the same time, the rear-reflection polarizer is respectively matched with the arrangement pattern of the liquid crystal molecules of the six liquid crystal layers. The design realizes six kinds of working modes of the rearview mirror, which makes the scope of application of the rearview mirror wider.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a mirror structural view of a rearview mirror of the present invention.

FIG. 2 is a schematic diagram of a mirror surface direction of a rear view mirror of the present invention.

FIG. 3 is a schematic diagram of an initial state of a normally white mode in a vertical alignment mode according to Example 1 of the present invention.

FIG. 4 is a schematic diagram of bias in a normally white mode in a vertical alignment mode according to Example 1 of the present invention.

FIG. 5 is a schematic diagram of an initial state of a normally black mode in a vertical alignment mode in Example 1 of the present invention.

FIG. 6 is a schematic diagram of a normally black mode bias voltage in a vertical alignment mode according to Example 1 of the present invention.

FIG. 7 is a schematic diagram of an initial state of a normally white mode in a horizontal alignment mode according to Embodiment 2 of the present invention.

FIG. 8 is a schematic diagram of a bias in a normally white mode in a horizontal alignment mode according to Embodiment 2 of the present invention.

FIG. 9 is a schematic diagram of an initial state of a normally black mode in a horizontal alignment mode according to Embodiment 2 of the present invention.

FIG. 10 is a schematic diagram of a normally black mode bias voltage in a horizontal alignment mode according to Embodiment 2 of the present invention.

FIG. 11 is a schematic diagram of an initial state of a normally white mode in a conventional twist orientation mode according to Embodiment 3 of the present invention.

FIG. 12 is a schematic diagram of a bias in a normally white mode of a conventional twist orientation mode according to Embodiment 3 of the present invention.

FIG. 13 is a schematic diagram of an initial state of a normally black mode in a conventional twist orientation mode according to Embodiment 3 of the present invention.

FIG. 14 is a schematic diagram of a normally black mode bias voltage in a conventional twist orientation mode according to Embodiment 3 of the present invention.

Wherein: the glass cover is 1, the front polarizer is 2, the front glass substrate is 3, the liquid crystal layer is 4, the rear glass substrate is 5, the rear reflective polarizer is 6, and the light absorption layer is 7.

The drawings are only for illustrative purposes, and should not be construed as limitations on the patent. In order to better illustrate this embodiment, some components of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For the person, it is understandable that some well-known structures in the drawings and their descriptions may be omitted; the same or similar reference numerals correspond to the same or similar components; the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood Is a limitation on this patent.

Detailed ways

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention is more clearly defined.

Example 1

An automatic anti-glare automobile electronic rear-view mirror includes a housing and a mirror structure provided on the housing. The mirror structure is shown in FIG. 1: including a glass cover plate 1, a front glass substrate 3, a rear glass substrate 5, The front polarizer 2, the rear reflective polarizer 6, and the light absorbing layer 7 form a sandwich structure between the front glass substrate 3 and the rear glass substrate 5. The sandwich structure is filled with a liquid crystal layer 4, the front polarizer 2 and the rear reflection type. A polarizer 6 is provided on the outside of the front glass substrate 3 and the rear glass substrate 5, respectively, a glass cover plate 1 is provided on the outside of the front polarizer 2, and a light absorption layer 7 is provided on the outside of the rear reflective polarizer 6; on the front glass substrate 3, A liquid crystal alignment layer is provided on each of opposite sides of the rear glass substrate 5 and the liquid crystal layer 4 is located between the liquid crystal alignment layers of the front glass substrate 3 and the rear glass substrate 5.

In this embodiment, the front polarizer 2 includes a linear polarizer mirror with high transmission and neutral color. The front polarizer 2 plays a role of polarization and detection in the rearview mirror; when we look squarely In the rear-view mirror, the transmission axis of the front polarizer 2 is along the clock from 12 o'clock to 6 o'clock; the front glass substrate 3 includes front glass with a transparent conductive layer, and the rear glass substrate 5 includes rear glass with a transparent conductive layer; The liquid crystal alignment layers disposed on the opposite sides of the front glass substrate 3 and the rear glass substrate 5 can obtain liquid crystal molecules of the liquid crystal layer 4 in a certain direction by methods such as rubbing or obtaining light. A driving voltage can be applied between the transparent conductive layers to change the arrangement of the liquid crystal molecules of the liquid crystal layer 4. The light absorbing layer 7 can absorb unreflected light to prevent these unreflected light from degrading the performance of the entire rearview mirror.

In this embodiment, the glass cover plate 1 and the front polarizer 2 of the rearview mirror, the front polarizer 2 and the front glass substrate 3, and the rear reflective polarizer 6 and the rear glass substrate 5 are all bonded by optical glue.

In this embodiment, the direction of the rearview mirror is shown in FIG. 2: each component of the rearview mirror is set parallel to the xoz plane, that is, each component of the rearview mirror is perpendicular to the xoy plane; where x represents the rearview mirror The horizontal axis of the mirror, y represents the vertical axis of the rearview mirror, and z represents the vertical axis of the rearview mirror; and the xoz plane is a horizontal plane and the xoy plane is a vertical plane.

The arrangement mode of the liquid crystal molecules of the liquid crystal layer 4 in this embodiment includes a vertical alignment mode. The vertical alignment mode means that, in the initial state, the negative liquid crystal molecules in the liquid crystal molecules of the liquid crystal layer 4 are almost perpendicular to the front glass substrate. 3 and the rear glass substrate 5 are arranged, specifically, the negative liquid crystal molecules in the liquid crystal molecules are aligned with the front glass substrate 3 and the rear glass substrate 50 at an angle of 88 to 89.5 degrees or -88 to -89.5 degrees. The projection direction of the molecules on the planes of the front glass substrate 3 and the rear glass substrate 5 under the action of the liquid crystal alignment layers of the front glass substrate 3 and the rear glass substrate 5 forms a 45-degree angle or a -45-degree angle with the transmission axis of the front polarizer 2; And because the negative liquid crystal molecules are arranged almost perpendicular to the front glass substrate 3 and the rear glass substrate 5, when the bias V is applied to the transparent conductive layers of the front glass substrate 3 and the rear glass substrate 5, the orientation change of the negative liquid crystal molecules is uniform. To avoid display defect problems; in this mode, the optical path difference range of the liquid crystal layer 4 is 175nm ≦ Δnd ≦ 375nm or 400nm ≦ Δnd ≦ 600nm. In this embodiment, the central value of the optical path difference of the liquid crystal layer 4 is taken as Δnd = kλ / 2, k = 1 or k = 2, and λ = 550 nm.

The vertical alignment mode of this embodiment is divided into a normally white mode and a normally black mode according to different angles formed by the transmission axes of the front polarizer 2 and the rear reflection polarizer 6.

In the normally white mode, the angle formed by the transmission axis of the front polarizer 2 and the rear reflective polarizer 6 is 90 degrees or -90 degrees; the configuration of the rear reflective polarizer 6 is parallel to the front polarizer 2 Polarized light reflection on the transmission axis, polarized light transmission perpendicular to the transmission axis of the front polarizer 2, that is, the configuration of the rear reflective polarizer 6 reflects polarized light perpendicular to the xoy plane, and polarizes parallel to the xoy plane Light transmission; as shown in FIG. 3: when the bias voltage V = 0 applied to the transparent conductive layers of the front glass substrate 3 and the rear glass substrate 5, the negative liquid crystal molecules in the liquid crystal molecules of the liquid crystal layer 4 are in the original state, In this state, the negative liquid crystal molecules are arranged almost perpendicular to the front glass substrate 3 and the rear glass substrate 5. When polarized light containing polarization directions parallel to xoy and perpendicular to the xoy plane enters, only the polarization direction is allowed for the front polarizer 2 The polarized light perpendicular to xoy enters the liquid crystal layer 4, and the liquid crystal layer 4 having negative liquid crystal molecules arranged almost vertically has no influence on the polarization state of the polarized light in this direction. The configuration of the rear-reflection polarizer 6 is to reflect polarized light parallel to the transmission axis of the front polarizer 2 and transmit polarized light perpendicular to the transmission axis of the front polarizer 2, that is, the rear-reflection polarizer 6 The configuration is to reflect the polarized light perpendicular to the xoy plane and transmit the polarized light parallel to the xoy plane; therefore, the polarized light whose polarization direction is perpendicular to the xoy is reflected back to the liquid crystal layer 4 and finally reflected back to the air. At this time, the bias voltage is 0, the optical path difference of the liquid crystal layer 4 is the largest, and the reflectance of the rearview mirror is the largest.

As shown in FIG. 4: When the bias voltage V applied to the transparent conductive layers of the front glass substrate 3 and the rear glass substrate 5 gradually increases to V ₀ , most of the negative liquid crystal molecules in the liquid crystal molecules of the liquid crystal layer 4 are in front. The liquid crystal alignment layers of the glass substrate 3 and the rear glass substrate 5 gradually tend to be parallel to the xoz plane, and the projection of the projection on the xoz plane is 45 degrees with the x axis, that is, most of the negative liquid crystal molecules are on the front glass substrate 3 and the rear. The projection direction of the front surface of the front glass substrate 3 and the back glass substrate 5 on the plane of the liquid crystal alignment layer of the glass substrate 5 forms a 45-degree angle or a -45-degree angle with the transmission axis of the front polarizer 2; In the process, the intensity of the reflected light gradually decreases. Finally, the reflective liquid crystal layer 4 is equivalent to a 1/2 wave plate. For light having a wavelength of λ, the state of polarization when the light reaches the rear reflective polarizer 6 It is parallel to the xoy plane and cannot be reflected. It can only be transmitted to the light absorbing layer 7 for absorption. At this time, when the optical path difference of the liquid crystal layer is Δnd = kλ / 2, the reflectance of the rearview mirror is the smallest.

In the normally white mode, the optical path difference of the liquid crystal layer 4 decreases with the increase of the bias voltage, and the reflectance of the rearview mirror decreases with the increase of the bias voltage. When the bias voltage is 0, the optical path length of the liquid crystal layer 4 decreases. The difference is the largest and the reflectivity of the rearview mirror is the largest.

In the normally black mode, this mode is the opposite of the normally white mode. In this mode, the angle formed by the transmission axis of the front polarizer 2 and the rear reflective polarizer 6 is 0 degrees; the configuration of the rear reflective polarizer 6 Is to transmit polarized light parallel to the transmission axis of the front polarizer 2 and to reflect polarized light perpendicular to the transmission axis of the front polarizer 2, that is, the configuration of the rear-reflective polarizer 6 is to make polarization parallel to the xoy plane Light reflection, polarized light transmission perpendicular to the xoy plane; as shown in Figure 5-6: In this mode, the optical path difference of the liquid crystal layer 4 decreases with increasing bias voltage, and the reflectance of the rearview mirror with bias voltage When the bias voltage is zero, the reflectance of the rearview mirror is the smallest.

In the drawing of this embodiment, a single arrow line segment indicates a light propagation direction, and a line segment with arrows at both ends thereof indicates a polarization direction parallel to the xoy plane or perpendicular to the z axis, and a black dot indicates a perpendicular direction to the xoy plane or parallel Polarization direction on the z axis.

In this embodiment, since the liquid crystal layer 4 is between the front glass substrate 3 and the rear glass substrate 5, the original alignment direction of the liquid crystal layer 4 is determined by the liquid crystal alignment layers provided on the front glass substrate 3 and the rear glass substrate 5. ; The bias voltage V applied to the transparent conductive layers of the front glass substrate 3 and the rear glass substrate 5 can change the arrangement direction of the negative liquid crystal molecules in the liquid crystal molecules of the liquid crystal layer 4, and then adjust the polarization state of the incident and reflected light. With the participation of the front polarizer 2 and the rear reflective polarizer 6, the reflected light intensity is controlled; the response time of the rearview mirror is greatly reduced, so that at room temperature, the response time is changed from maximum reflection-> minimum reflection-> One cycle of maximum reflection is within 30ms; at low temperature of -40degC, the response time will be less than 1s; so that the rearview mirror will play a better anti-glare effect in time.

Example 2

This embodiment is different from Embodiment 1 in that the arrangement pattern of liquid crystal molecules of the liquid crystal layer 4 is different.

In this embodiment, the alignment mode of the liquid crystal molecules of the liquid crystal layer 4 includes a horizontal alignment mode. The horizontal alignment mode means that, in the initial state, the positive liquid crystal molecules in the liquid crystal molecules of the liquid crystal layer 4 are almost parallel to the front glass substrate. 3 and the rear glass substrate 5 are aligned, that is, the negative liquid crystal molecules in the liquid crystal molecules are arranged at an included angle of 0.5 degrees to 2 degrees or -0.5 degrees to -2 degrees with the front glass substrate 3 and the rear glass substrate 5. The projection direction of the positive liquid crystal molecules on the planes of the front glass substrate 3 and the rear glass substrate 5 under the action of the liquid crystal alignment layers of the front glass substrate 3 and the rear glass substrate 5 forms a 45-degree angle or -45 with the transmission axis of the front polarizer 2 Angled array; and since the positive liquid crystal molecules are arranged almost parallel to the front glass substrate 3 and the rear glass substrate 5, the positive liquid crystal molecules are applied with a bias voltage V applied to the transparent conductive layers of the front glass substrate 3 and the rear glass substrate 5. The orientation change is uniform to avoid display defects. In this mode, the optical path difference range of the liquid crystal layer 4 is 175 nm ≦ Δnd ≦ 375 nm or 400 nm ≦ Δnd ≦ 600 nm. In this embodiment, the central value of the optical path difference of the liquid crystal layer 4 is taken as Δnd = kλ / 2, where k = 1 or k = 2, and λ = 550 nm.

In the horizontal alignment mode, the principle that the arrangement direction of the positive liquid crystal molecules in the liquid crystal molecules of the liquid crystal layer 4 changes with the increased bias is the same as that of the embodiment 1. Similarly, the horizontal alignment mode of this embodiment is based on the front polarizer The angle formed by 2 and the transmission axis of the retro-reflective polarizer 6 is different into a normally white mode and a normally black mode.

In the normally white mode, the angle formed by the transmission axis of the front polarizer 2 and the rear reflection polarizer 6 is 0 degrees, and the configuration of the rear reflection polarizer 6 is perpendicular to the transmission axis of the front polarizer 2 Polarized light reflection, polarized light transmission parallel to the transmission axis of the front polarizer 2, that is, the configuration of the rear-reflective polarizer 6 is to reflect polarized light parallel to the xoy plane and transmit polarized light perpendicular to the xoy plane; As shown in FIG. 7: when the bias voltage V = 0 applied to the transparent conductive layers of the front glass substrate 3 and the rear glass substrate 5, the optical path difference of the liquid crystal layer 4 is the largest, and the reflectance of the rear view mirror is the largest.

As shown in FIG. 8: When the bias voltage V applied to the transparent conductive layers of the front glass substrate 3 and the rear glass substrate 5 gradually increases to V ₀ , the optical path difference of the liquid crystal layer 4 decreases as the bias voltage increases, and The mirror's reflectivity decreases with increasing bias.

In the normally black mode, this mode is the opposite of the normally white mode. In this mode, the angle formed by the transmission axis of the front polarizer 2 and the rear reflective polarizer 6 is 90 degrees or -90 degrees; The arrangement of the sheet 6 reflects polarized light parallel to the transmission axis of the front polarizer 2 and transmits the polarized light perpendicular to the transmission axis of the front polarizer 2, that is, the configuration of the rear-reflective polarizer 6 is perpendicular to The polarized light reflection on the xoy plane is transmitted parallel to the polarized light on the xoy plane; as shown in Figure 9-10: In this mode, the optical path difference of the liquid crystal layer 4 decreases with increasing bias, and the reflection from the rearview mirror The rate increases with increasing bias voltage. When the bias voltage is zero, the reflectance of the rearview mirror is the smallest.

Example 3

In this embodiment, the alignment mode of the liquid crystal molecules of the liquid crystal layer 4 includes a conventional twisted alignment mode, which means that, in the initial state, the positive liquid crystal molecules in the liquid crystal molecules of the liquid crystal layer 4 are on the front glass substrate 3. Distorted with the rear glass substrate 5 at 90 degrees or -90 degrees. The projection of the positive liquid crystal molecules on the plane of the front glass substrate 3 forms a 0-degree angle or a 90-degree angle or a -90-degree angle with the front polarizer 2. In this mode, the optical path difference range of the liquid crystal layer 4 is 375 nm ≦ Δnd ≦ 575 nm or 900 nm ≦ Δnd ≦ 1200 nm. In this embodiment, the center value of the optical path difference of the liquid crystal layer 4 is taken as Δnd = 0.866λ or Δnd = 1.936λ, that is, the center value of the optical path difference of the liquid crystal layer 4 is taken as the first minimum of the conventional twist alignment mode. Value or second minimum, where λ = 550 nm.

In the conventional twisted alignment mode, the principle that the arrangement direction of the positive liquid crystal molecules in the liquid crystal molecules of the liquid crystal layer 4 changes with an increased bias is the same as in Example 1. Similarly, the conventional twisted alignment mode in this embodiment is based on the previous The angles formed by the polarizing plates 2 and the rear-reflective polarizing plates 6 are different from each other into a normally white mode and a normally black mode.

In the normally white mode, the angle formed by the transmission axis of the front polarizer 2 and the rear reflection polarizer 6 is 0; the configuration of the rear reflection polarizer 6 is a polarization perpendicular to the transmission axis of the front polarizer 2 Light reflection, polarized light transmission parallel to the transmission axis of the front polarizer 2, that is, the configuration of the rear reflection polarizer 6 is to reflect polarized light parallel to the xoy plane and transmit polarized light perpendicular to the xoy plane; As shown in FIG. 11, when the bias voltage V = 0 applied to the transparent conductive layers of the front glass substrate 3 and the rear glass substrate 5, the optical path difference of the liquid crystal layer is 0, and the reflectance of the rearview mirror is the largest.

As shown in FIG. 12: When the bias voltage V applied to the transparent conductive layers of the front glass substrate 3 and the rear glass substrate 5 gradually increases to V ₀ , the optical path difference of the liquid crystal layer 4 decreases as the bias voltage increases, and The mirror's reflectivity decreases with increasing bias.

In the normally black mode, this mode is the opposite of the normally white mode. In this mode, the angle formed by the transmission axis of the front polarizer 2 and the rear reflective polarizer 6 is 90 degrees or -90 degrees; The arrangement of the sheet 6 reflects polarized light parallel to the transmission axis of the front polarizer 2 and transmits the polarized light perpendicular to the transmission axis of the front polarizer 2, that is, the configuration of the rear-reflective polarizer 6 is perpendicular to The polarized light reflection on the xoy plane is transmitted parallel to the polarized light on the xoy plane, as shown in Figure 13-14. In this mode, the optical path difference of the liquid crystal layer 4 decreases with increasing bias, and the reflection from the rearview mirror The rate decreases with increasing bias voltage. When the bias voltage is zero, the reflectance of the rearview mirror is the smallest.

The rearview mirror of the present invention uses the liquid crystal display technology principle of the liquid crystal layer 4 to make the reflection color of the rearview mirror remain black and white and monochrome; at the same time, the rear reflection polarizer 6 and the six liquid crystal molecules 4 are arranged in an alignment pattern With the design, six kinds of working modes of the rearview mirror are realized, which makes the scope of application of the rearview mirror wider.

Obviously, the foregoing embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. There is no need and cannot be exhaustive for all implementations. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

An automatic anti-glare automobile electronic rear-view mirror includes a housing, a front glass substrate (3) and a rear glass substrate (5) provided on the housing, and the front glass substrate (3) and the rear glass substrate (5) ) Is provided with a liquid crystal layer (4), which further includes a front polarizer (2) and a rear reflective polarizer (6), and the front polarizer (2) and the rear reflective polarizer (6) Respectively provided on the outside of the front glass substrate (3) and the rear glass substrate (5), and a glass cover (1) is provided on the outside of the front polarizer (2); and the front glass substrate (3) A liquid crystal alignment layer is disposed on the opposite side of the rear glass substrate (5), and the liquid crystal layer (4) is located between the liquid crystal alignment layers of the front glass substrate (3) and the rear glass substrate (5).
The automatic anti-glare automobile electronic rear-view mirror according to claim 1, wherein the front polarizer (2) comprises a linear polarizer with high transmittance and neutral color; A light absorbing layer (7) is provided on the outside of the polarizer (6).
The automatic anti-glare automobile electronic rear view mirror according to claim 1, wherein the front glass substrate (3) comprises a front glass with a transparent conductive layer, and the rear glass substrate (5) comprises a transparent glass. The back glass of the conductive layer.
The automatic anti-glare automobile electronic rear-view mirror according to claim 1, wherein the glass cover (1) and the front polarizer (2), the front polarizer (2) and the front The glass substrate (3), the rear reflective polarizer (6) and the rear glass substrate (5) are all bonded by optical glue.
The automatic anti-glare automobile electronic rear-view mirror according to claim 1, wherein the arrangement mode of the liquid crystal molecules of the liquid crystal layer (4) includes a vertical alignment mode, and the negativeness in the liquid crystal molecules of the vertical alignment mode is negative. Liquid crystal molecules are arranged at an included angle of 88 degrees to 89.5 degrees or -88 degrees to -89.5 degrees with the front glass substrate (3) and the rear glass substrate (5). The negative liquid crystal molecules are arranged on the front glass substrate (3). ) And the liquid crystal alignment layer of the rear glass substrate (5), the projection direction on the plane of the front glass substrate (3) and the rear glass substrate (5) is 45 degrees with the transmission axis of the front polarizer (2) Angle or -45 degree angle, the optical path difference range of the liquid crystal layer (4) in the vertical alignment mode is 175nm≤Δnd≤375nm or 400nm≤Δnd≤600nm.
The automatic anti-glare automobile electronic rear view mirror according to claim 5, wherein the vertical alignment mode is based on a transmission axis of the front polarizer (2) and the rear reflective polarizer (6). The different angles are divided into normally white mode and normally black mode;

In the normally white mode, the angle formed by the transmission axis of the front polarizer (2) and the rear reflective polarizer (6) is 90 degrees or -90 degrees; the rear reflective polarizer (6) ) Is configured to reflect polarized light parallel to the transmission axis of the front polarizer (2) and transmit polarized light perpendicular to the transmission axis of the front polarizer (2) to transmit; the optical path difference of the liquid crystal layer (4) Decreases with increasing bias, the reflectance of the rearview mirror decreases with increasing bias;

In the normally black mode, the angle formed by the transmission axis of the front polarizer (2) and the rear reflective polarizer (6) is 0 degrees; the configuration of the rear reflective polarizer (6) is Transmit polarized light parallel to the transmission axis of the front polarizer (2) and reflect polarized light perpendicular to the transmission axis of the front polarizer (2); the optical path difference of the liquid crystal layer (4) varies with the bias It increases and decreases, and the reflectance of the rear-view mirror increases as the bias voltage increases.
The automatic anti-glare automobile electronic rear-view mirror according to claim 1, wherein an arrangement pattern of liquid crystal molecules of the liquid crystal layer (4) includes a horizontal alignment pattern, and the positiveness in the liquid crystal molecules of the horizontal alignment pattern is positive. Liquid crystal molecules are arranged at an included angle of 0.5 degrees to 2 degrees or -0.5 degrees to -2 degrees with the front glass substrate (3) and the rear glass substrate (5). The positive liquid crystal molecules are arranged on the front glass substrate (3). ) And the liquid crystal alignment layer of the rear glass substrate (5), the projection direction on the plane of the front glass substrate (3) and the rear glass substrate (5) is 45 degrees with the transmission axis of the front polarizer (2) Angle or -45 degree angle, the optical path difference range of the liquid crystal layer (4) in the horizontal alignment mode is 175nm≤Δnd≤375nm or 400nm≤Δnd≤600nm.
The automatic anti-glare automobile electronic rear-view mirror according to claim 7, wherein the horizontal alignment mode is based on a transmission axis of the front polarizer (2) and the rear reflective polarizer (6). The different angles are divided into normally white mode and normally black mode;

In the normally white mode, the angle formed by the transmission axis of the front polarizer (2) and the rear reflective polarizer (6) is 0; the configuration of the rear reflective polarizer (6) is such that Polarized light reflection perpendicular to the transmission axis of the front polarizer (2) and polarized light transmission parallel to the transmission axis of the front polarizer (2) are transmitted; the optical path difference of the liquid crystal layer (4) increases with the bias While decreasing, the reflectivity of the rearview mirror decreases with increasing bias voltage;

In the normally black mode, the angle formed by the transmission axis of the front polarizer (2) and the rear reflective polarizer (6) is 90 degrees or -90 degrees; the rear reflective polarizer (6) ) Is configured to reflect polarized light parallel to the transmission axis of the front polarizer (2) and transmit polarized light perpendicular to the transmission axis of the front polarizer (2) to transmit; the optical path difference of the liquid crystal layer (4) As the bias increases, the reflectivity of the rearview mirror increases as the bias increases.
The automatic anti-glare automobile electronic rear-view mirror according to claim 1, wherein an arrangement pattern of liquid crystal molecules of the liquid crystal layer (4) includes a conventional twisted alignment pattern, Positive liquid crystal molecules are arranged in a twist of 90 degrees or -90 degrees from the front glass substrate (3) to the rear glass substrate (5). The projection of the positive liquid crystal molecules on the plane of the front glass substrate (3) and the front polarizer ( 2) The transmission axis is at an angle of 0 or 90 degrees or -90 degrees, and the optical path difference range of the liquid crystal layer (4) in the conventional twisted alignment mode is set to 375nm≤Δnd≤575nm or 900nm≤Δnd≤1200nm .
The automatic anti-glare automobile electronic rear-view mirror according to claim 9, wherein the twisted orientation mode is based on a transmission axis of the front polarizer (2) and the rear reflective polarizer (6). The different angles are divided into normally white mode and normally black mode;

In the normally white mode, the angle formed by the transmission axis of the front polarizer (2) and the rear reflective polarizer (6) is 0; the configuration of the rear reflective polarizer (6) is such that Polarized light reflection perpendicular to the transmission axis of the front polarizer (2) and polarized light transmission parallel to the transmission axis of the front polarizer (2) are transmitted; the optical path difference of the liquid crystal layer (4) increases with the bias While decreasing, the reflectivity of the rearview mirror decreases with increasing bias voltage;

In the normally black mode, the angle formed by the front polarizer (2) and the rear reflective polarizer (6) is 90 degrees or -90 degrees; the rear reflective polarizer (6) The configuration is to reflect the polarized light parallel to the transmission axis of the front polarizer (2) and transmit the polarized light perpendicular to the transmission axis of the front polarizer (2); the optical path difference of the liquid crystal layer (4) varies with As the bias voltage increases, the reflectance of the rearview mirror increases as the bias voltage increases.