WO2019232915A1 - Rétroviseur électronique anti-éblouissement automatique pour véhicule automobile - Google Patents

Rétroviseur électronique anti-éblouissement automatique pour véhicule automobile Download PDF

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Publication number
WO2019232915A1
WO2019232915A1 PCT/CN2018/099189 CN2018099189W WO2019232915A1 WO 2019232915 A1 WO2019232915 A1 WO 2019232915A1 CN 2018099189 W CN2018099189 W CN 2018099189W WO 2019232915 A1 WO2019232915 A1 WO 2019232915A1
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WIPO (PCT)
Prior art keywords
glass substrate
liquid crystal
polarizer
transmission axis
degrees
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PCT/CN2018/099189
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English (en)
Chinese (zh)
Inventor
郭建新
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惠州市德赛西威汽车电子股份有限公司
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Publication of WO2019232915A1 publication Critical patent/WO2019232915A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/02—Rear-view mirror arrangements
    • B60R1/08—Rear-view mirror arrangements involving special optical features, e.g. avoiding blind spots, e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors
    • B60R1/083—Anti-glare mirrors, e.g. "day-night" mirrors
    • B60R1/088—Anti-glare mirrors, e.g. "day-night" mirrors using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1313—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells specially adapted for a particular application
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

Definitions

  • the invention relates to the technical field of automobile rearview mirrors, in particular to an automatic anti-glare automobile electronic rearview mirror.
  • the automatic anti-glare rearview mirror installed inside 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.
  • the cathode in the electrochromic solution 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the present invention provides an automatic anti-glare automobile rearview mirror.
  • 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.
  • 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.
  • 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.
  • the front glass substrate includes a front glass with a transparent conductive layer
  • the rear glass substrate includes a rear glass with a transparent conductive layer
  • 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.
  • the arrangement mode of the liquid crystal molecules of the liquid crystal layer includes a vertical alignment mode
  • 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.
  • 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
  • the optical path difference range of the liquid crystal layer in the vertical alignment mode is 175nm ⁇ nd ⁇ 375nm or 400nm ⁇ nd ⁇ 600nm.
  • 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;
  • 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;
  • 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.
  • the arrangement mode of the liquid crystal molecules of the liquid crystal layer includes a horizontal alignment mode
  • 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.
  • 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
  • the optical path difference range of the liquid crystal layer in the horizontal alignment mode is 175nm ⁇ nd ⁇ 375nm or 400nm ⁇ nd ⁇ 600nm.
  • 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;
  • 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.
  • 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.
  • 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 ⁇ ⁇ nd ⁇ 575 nm or 900 nm ⁇ ⁇ nd ⁇ 1200 nm.
  • 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;
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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;
  • 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 optical path difference range of the liquid crystal layer 4 is 175nm ⁇ ⁇ nd ⁇ 375nm or 400nm ⁇ ⁇ nd ⁇ 600nm.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the reflective liquid crystal layer 4 is equivalent to a 1/2 wave plate.
  • 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.
  • the reflectance of the rearview mirror is the smallest.
  • 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.
  • 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.
  • this mode is the opposite of the normally white 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:
  • 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.
  • a single arrow line segment indicates a light propagation direction
  • a line segment with arrows at both ends thereof indicates a polarization direction parallel to the xoy plane or perpendicular to the z axis
  • a black dot indicates a perpendicular direction to the xoy plane or parallel Polarization direction on the z axis.
  • 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.
  • 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.
  • Embodiment 1 is different from Embodiment 1 in that the arrangement pattern of liquid crystal molecules of the liquid crystal layer 4 is different.
  • 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.
  • the optical path difference range of the liquid crystal layer 4 is 175 nm ⁇ ⁇ nd ⁇ 375 nm or 400 nm ⁇ ⁇ nd ⁇ 600 nm.
  • 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.
  • 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.
  • 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;
  • this mode is the opposite of 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 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:
  • 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.
  • Embodiment 1 is different from Embodiment 1 in that the arrangement pattern of liquid crystal molecules of the liquid crystal layer 4 is different.
  • 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.
  • the optical path difference range of the liquid crystal layer 4 is 375 nm ⁇ ⁇ nd ⁇ 575 nm or 900 nm ⁇ ⁇ nd ⁇ 1200 nm.
  • the conventional twisted alignment mode 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.
  • 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
  • this mode is the opposite of 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 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.
  • 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.

Abstract

L'invention concerne un rétroviseur électronique anti-éblouissement automatique pour un véhicule automobile comprenant un boîtier, un substrat de verre avant (3) disposé sur le boîtier, un substrat de verre arrière (5), un polariseur avant (2) et un polariseur arrière réfléchissant (6). Une couche de cristaux liquides (4) est disposée entre le substrat de verre avant (3) et le substrat de verre arrière (5). Le polariseur avant (2) et le polariseur réfléchissant arrière (6) sont respectivement disposés au niveau de côtés externes du substrat de verre avant (3) et du substrat de verre arrière (5). Un couvercle en verre (1) est disposé au niveau d'un côté externe du polariseur avant (2). Des couches d'alignement de cristaux liquides sont disposées sur des côtés opposés du substrat de verre avant (3) et du substrat de verre arrière (5), et la couche de cristaux liquides (4) est située entre les couches d'alignement de cristaux liquides du substrat de verre avant (3) et du substrat de verre arrière (5). La direction d'alignement de molécules de cristaux liquides dans la couche de cristaux liquides (4) du rétroviseur électronique anti-éblouissement automatique pour véhicules automobiles est réglée par la sollicitation de couches électro-conductrices transparentes du substrat de verre avant (3) et du substrat de verre arrière (5), ce qui permet de régler l'état de polarisation de la lumière incidente et réfléchie de manière à réaliser, au moyen du polariseur avant (2) et du polariseur réfléchissant arrière (6), la commande de l'intensité de la lumière réfléchie du rétroviseur de sorte que le temps de réponse du rétroviseur est considérablement réduit et un effet anti-éblouissement amélioré est obtenu en temps voulu.
PCT/CN2018/099189 2018-06-08 2018-08-07 Rétroviseur électronique anti-éblouissement automatique pour véhicule automobile WO2019232915A1 (fr)

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Application Number Priority Date Filing Date Title
CN201810587501.2A CN109278649B (zh) 2018-06-08 2018-06-08 一种自动防眩光汽车电子后视镜
CN201810587501.2 2018-06-08

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WO2019232915A1 true WO2019232915A1 (fr) 2019-12-12

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