Anti-dazzle rearview mirror

Abstract

The utility model relates to an anti-dazzle rearview mirror which comprises a liquid crystal box and a reflecting layer. The liquid crystal box comprises a first glass plate, a liquid crystal layer and a second glass plate which are sequentially arranged from front to back, the liquid crystal layer is clamped between the first glass plate and the second glass plate, and the liquid crystal layer is nematic liquid crystals; a first transparent electrode is arranged on the side face, close to the liquid crystal layer, of the first glass plate, a second transparent electrode is arranged on the side face, close to the liquid crystal layer, of the second glass plate, and an electrode overlapping area exists between the second transparent electrode and the first transparent electrode to form a light control area. The reflecting layer is arranged on the front side surface or the rear side surface of the second glass plate; the liquid crystal layer is doped with a secondary dye and a chiral agent, the liquid crystal layer has a liquid crystal twist angle in an OFF state, and the liquid crystal twist angle is larger than 90 degrees and smaller than 160 degrees. The anti-dazzle rearview mirror has the anti-dazzle effect, a polaroid can be omitted, the manufacturing cost is reduced, the problem that the polaroid falls off or is damaged is solved, and the using effect and safety of the rearview mirror are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile rearview mirror, specifically relates to a kind of anti-dazzle rearview mirror. BACKGROUND

[0002] Liquid crystal rearview mirror is generally the rearview mirror using liquid crystal to control light reflectivity, it is generally connected with light response and controller, when it senses the far light of rear vehicle, it can reduce the reflection of rearview mirror by the way of liquid crystal optics, to avoid the interference of far light to driver's sight, improve the safety of driving.

[0003] Traditional liquid crystal rearview mirror generally includes liquid crystal light valve and the reflective film attached behind liquid crystal light valve;Liquid crystal light valve generally includes first polaroid, liquid crystal box and second polaroid, and the liquid crystal box is TN liquid crystal box. However, since this kind of liquid crystal rearview mirror has two layers of polaroid, its structure is complex, and the two layers of polaroid will cause greater light absorption, resulting in the reflectivity of rearview mirror being too low;And since the reflective layer needs to be set behind the second polaroid, it generally needs to use plastic sheet as carrier (i.e. using plastic sheet with reflective film), which often leads to low flatness, causing the formed mirror to be prone to image distortion and other problems. In addition, the traditional liquid crystal rearview mirror also has problems such as high manufacturing cost, easy falling or damage of polaroid in anti-dazzle technology application. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide an anti-dazzle rearview mirror, which not only has anti-dazzle effect, but also can save polaroid, reduce manufacturing cost, avoid the problem of falling or damage of polaroid, and improve the use effect and safety of rearview mirror. The technical scheme adopted is as follows:

[0005] An anti-dazzle rearview mirror, comprising a liquid crystal box and a reflective layer;The liquid crystal box comprises a first glass plate, a liquid crystal layer and a second glass plate arranged in order from front to back, the liquid crystal layer is clamped between the first glass plate and the second glass plate, and the liquid crystal layer is nematic liquid crystal;The side of the first glass plate close to the liquid crystal layer is provided with a first transparent electrode, the side of the second glass plate close to the liquid crystal layer is provided with a second transparent electrode, and there is an electrode overlapping area between the second transparent electrode and the first transparent electrode to form a light control area;Characterized in that: the reflective layer is arranged on the front side or the back side of the second glass plate;The liquid crystal layer is doped with secondary dye and chiral agent, and the liquid crystal layer has a liquid crystal twist angle in OFF state, and the liquid crystal twist angle is greater than 90° and less than 160°.

[0006] Generally, the first transparent electrode and the second transparent electrode can be ITO electrode, which can be patterned from transparent conductive film (such as ITO film).

[0007] The liquid crystal layer can be formed by doping a certain amount of dichroic dye and chiral agent into the nematic liquid crystal in advance and sealing the nematic liquid crystal into the liquid crystal cell together; the dichroic dye is generally dark or black organic dye (such as a guest-host dye), and the dye molecules can be arranged along the arrangement of the liquid crystal molecules, the dichroic dye has different light absorption in different optical axis directions, has different color display, and can be used for transparent display and dimming glass. By adding the chiral agent in the liquid crystal, the liquid crystal layer can present a liquid crystal twist angle greater than 90° and less than 160° in the OFF state, which is the key to realizing the above-mentioned dye molecule arrangement and anti-glare effect.

[0008] In work, when the liquid crystal cell is in the OFF state, the dye molecules in the liquid crystal layer are twisted along the liquid crystal layer due to the liquid crystal twist angle of the liquid crystal layer in the OFF state; the dye molecules close to different sides in the liquid crystal layer have a certain included angle; due to the polarized light absorption effect of the dye molecules, when the dye molecules close to different sides present a certain angle, the effect is equivalent to the overlap of two polarizing sheets at a certain absorption axis angle, therefore, the transmittance of the structure at this time is relatively low, and the black state is reached, and the anti-glare effect is achieved. When the liquid crystal cell is in the ON state (i.e. a suitable voltage is applied between the first transparent electrode and the second transparent electrode), the liquid crystal molecules and the dye molecules of the liquid crystal layer are deflected and turned to the vertical state, the incident external natural light can pass through the liquid crystal layer to reach the reflecting layer, and the reflected light passes through the liquid crystal layer again to form a reflecting mirror, at this time, the rearview mirror can be used as a mirror; and the degree of the vertical of the dye molecules and the liquid crystal molecules (i.e. the liquid crystal twist angle of the deflection of the dye molecules and the liquid crystal molecules) can be changed by adjusting the VLCD voltage, so that the reflectivity of the liquid crystal cell is changed, and the anti-glare effect is achieved.

[0009] As a preferred scheme of the utility model, the liquid crystal twist angle is 100°-150°.

[0010] As a preferred scheme of the utility model, the first glass plate and the second glass plate are ITO glass plates.

[0011] As a preferred scheme of the utility model, the side surface of the first glass plate close to the liquid crystal layer and the side surface of the second glass plate close to the liquid crystal layer are coated with PI orientation layers.

[0012] As a preferred scheme of the utility model, the edge part of the first glass plate and the edge part of the second glass plate are mutually adhered through the sealing rubber ring, the sealing rubber ring is equipped with a filling port and a sealing glue for sealing the filling port. When the liquid crystal layer is made, the edge part of the first glass plate and the edge part of the second glass plate are adhered through the sealing rubber ring first, then a certain dose of dichroic dye and chiral agent are doped in the nematic liquid crystal in advance and are filled in the inside of the sealing rubber ring through the sealing port together with the nematic liquid crystal, and finally the sealing glue is used to seal the filling port.

[0013] As a further preferred scheme of the utility model, the sealing rubber ring is equipped with a silicon ball. By arranging the silicon ball, the supporting strength of the sealing rubber ring is appropriately enhanced.

[0014] As a preferred scheme of the utility model, a plurality of plastic pad spacer particles are uniformly arranged in the liquid crystal layer. The plastic pad spacer particle is usually made of transparent plastic, and by arranging the plastic pad spacer particle in the liquid crystal layer, the strength of the liquid crystal layer is enhanced.

[0015] As a preferred scheme of the utility model, the reflective layer is arranged on the back side of the second glass plate, and the reflective layer is an aluminum layer; the anti-dazzle rearview mirror further comprises a first molybdenum layer and a second molybdenum layer, the first molybdenum layer is arranged between the second glass plate and the aluminum layer, and the second molybdenum layer is arranged on the back side of the aluminum layer. When the anti-dazzle rearview mirror is made, the first molybdenum layer is first plated on the back side of the second glass plate, then an aluminum layer is plated on the back side of the first molybdenum layer, and finally the second molybdenum layer is plated on the back side of the aluminum layer. The first molybdenum layer is used to increase the bonding force between the aluminum layer and the front side of the second glass plate, and the second molybdenum layer is used to protect the aluminum layer.

[0016] As another preferred scheme of the utility model, the reflective layer is arranged on the front side of the second glass plate, and the reflective layer is an aluminum layer; the anti-dazzle rearview mirror further comprises a first molybdenum layer and a second molybdenum layer, the first molybdenum layer is arranged between the second glass plate and the aluminum layer, and the second molybdenum layer is arranged on the front side of the aluminum layer. When the anti-dazzle rearview mirror is made, the first molybdenum layer is first plated on the front side of the second glass plate, then an aluminum layer is plated on the front side of the first molybdenum layer, and finally the second molybdenum layer is plated on the front side of the aluminum layer. The first molybdenum layer is used to increase the bonding force between the aluminum layer and the front side of the second glass plate, and the second molybdenum layer is used to protect the aluminum layer.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] (1) The anti-dazzle rearview mirror does not need to paste front and back polarizing sheets to realize the anti-dazzle function, saves the polarizing sheet, simplifies the structure, reduces the manufacturing cost, avoids the problems of falling or damage of the polarizing sheet, and improves the use effect and safety of the rearview mirror;

[0019] (2) This anti-glare rearview mirror changes the liquid crystal deflection (OFF state and ON state) of the dye liquid crystal by adjusting the VLCD voltage, thereby achieving a change in reflectivity and achieving an anti-glare effect;

[0020] (3) This anti-glare rearview mirror has a filling port on the sealing rubber ring to facilitate the filling of dye liquid crystal, and adopts a new sealing stop line design to reduce the erosion of the dye liquid crystal on the plastic pad spacer near the filling port in the liquid crystal box during filling, solve the problem of poor powder migration of the filling pad spacer, and improve the filling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of an anti-glare rearview mirror according to a preferred embodiment of the present invention.

[0022] Figure 2 yes Figure 1 Schematic diagram of the state of the liquid crystal box in the anti-glare rearview mirror in the OFF state.

[0023] Figure 3 yes Figure 1 Schematic diagram of the state of the liquid crystal box in the anti-glare rearview mirror in the ON state.

[0024] Figure 4 It is a cross-sectional view of the anti-glare rearview mirror of Example 2, a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0025] Example 1, as Figures 1-3 As shown, this anti-glare rearview mirror includes a liquid crystal cell 1 and a reflective layer 2; the liquid crystal cell 1 includes a first glass plate 11, a liquid crystal layer 12, and a second glass plate 13 arranged in sequence from front to back, the liquid crystal layer 12 is sandwiched between the first glass plate 11 and the second glass plate 13, and the liquid crystal layer 12 is a nematic liquid crystal; a first transparent electrode is provided on the side of the first glass plate 11 close to the liquid crystal layer 12, and a second transparent electrode is provided on the side of the second glass plate 13 close to the liquid crystal layer 12, and an electrode overlap area exists between the second transparent electrode and the first transparent electrode to form a light control area; the reflective layer 2 is provided on the front side or the rear side of the second glass plate 13; the liquid crystal layer 12 is doped with a secondary dye and a chiral agent, and the liquid crystal layer 12 has a liquid crystal twist angle in the OFF state, and the liquid crystal twist angle is 100°-150°.

[0026] In this embodiment, the first glass plate 11 and the second glass plate 13 are ITO glass plates, and the side of the first glass plate 11 close to the liquid crystal layer 12 and the side of the second glass plate close to the liquid crystal layer 12 are both coated with a PI alignment layer 14 .

[0027] In this embodiment, a reflective layer 2 is provided on the rear side of the second glass plate 13 and is an aluminum layer. The anti-glare rearview mirror also includes a first molybdenum layer 3 and a second molybdenum layer 4. The first molybdenum layer 3 is sandwiched between the second glass plate 13 and the aluminum layer, and the second molybdenum layer 4 is provided on the rear side of the reflective layer 2. During manufacturing, the first molybdenum layer 3 is first plated on the rear side of the second glass plate 13. Then, an aluminum layer is plated on the rear side of the first molybdenum layer 3 to serve as the reflective layer 2. Finally, the second molybdenum layer 4 is plated on the rear side of the reflective layer 2. The first molybdenum layer 3 serves to strengthen the bonding between the reflective layer 2 and the front side of the second glass plate 13, while the second molybdenum layer 4 protects the reflective layer 2.

[0028] In this embodiment, a plurality of plastic spacers 15 are evenly arranged in the liquid crystal layer 12. The plastic spacers 15 are usually made of transparent plastic. By arranging the plastic spacers 15 in the liquid crystal layer 12, the strength of the liquid crystal layer 12 is enhanced.

[0029] In this embodiment, the edge of the first glass plate 11 and the edge of the second glass plate 13 are bonded together via a sealing rubber ring 16. Sealing rubber ring 16 is provided with a filling port 161 and a sealing adhesive 162 for sealing filling port 161. When fabricating the liquid crystal layer 12, the edge of the first glass plate 11 and the edge of the second glass plate 13 are first bonded together via sealing rubber ring 16. A predetermined amount of dichroic dye and chiral agent is then pre-doped into the nematic liquid crystal and, along with the nematic liquid crystal, fills port 161 through the sealing rubber ring 16. Finally, filling port 161 is sealed with sealing adhesive 162. Silicon balls 17 are positioned within sealing rubber ring 16 to enhance the support strength of sealing rubber ring 16.

[0030] The following is a brief description of the working principle of this anti-glare rearview mirror:

[0031] In working, when the liquid crystal box 1 is in OFF state, since the liquid crystal layer 12 has liquid crystal twist angle in OFF state, the dye molecules 122 in the liquid crystal layer 12 are twisted with the liquid crystal layer 12; the dye molecules 122 close to different sides in the liquid crystal layer 12 have certain included angle; since the dye molecules 122 have polarized light absorption effect, when the dye molecules 122 close to different sides have certain angle, the effect is equivalent to that two polarized films are overlapped with certain absorption axis angle, therefore, the transmittance of the structure is low at this time, black state is presented, the anti-glare effect is achieved. When the liquid crystal box 1 is in ON state (i.e. suitable voltage is applied between the first transparent electrode and the second transparent electrode), the liquid crystal molecules 121 and the dye molecules 122 of the liquid crystal layer 12 are deflected and turned to vertical state, the incident external natural light can pass through the liquid crystal layer 12 to reach the reflecting layer 2, the reflected light forms reflecting mirror image again by passing through the liquid crystal layer 12, at this time, the rearview mirror can be used as mirror; and the degree of standing of the dye molecules 122 and the liquid crystal molecules 121 (i.e. the deflection liquid crystal twist angle of the dye molecules 122 and the liquid crystal molecules 121) can be changed by adjusting the VLCD voltage, so that the reflectivity of the liquid crystal box 1 is changed, the anti-glare effect is achieved.

[0032] Embodiment two, refer to Figure 4 In other parts are same with embodiment one, the difference is that: in the embodiment, the reflecting layer 2 is arranged on the front side of the second glass plate 13, the reflecting layer 2 is aluminum layer; the anti-glare rearview mirror further comprises a first molybdenum layer 3 and a second molybdenum layer 4, the first molybdenum layer 3 is arranged between the second glass plate 13 and the reflecting layer 2, and the second molybdenum layer 4 is arranged on the front side of the reflecting layer 2. In production, the first molybdenum layer 3 is plated on the front side of the second glass plate 13, then an aluminum layer is plated on the front side of the first molybdenum layer 3 as the reflecting layer 2, and finally the second molybdenum layer 4 is plated on the front side of the reflecting layer 2. The first molybdenum layer 3 is used to increase the bonding force between the reflecting layer 2 and the front side of the second glass plate 13, and the second molybdenum layer 4 is used to protect the reflecting layer 2.

[0033] In addition, it should be noted that the specific embodiments described in the specification can have different names and the like, and any equivalent or simple changes made in accordance with the structure, features and principles of the patent concept are included in the protection scope of the patent. The skilled in the art of the present application can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the structure of the present application or exceed the scope defined in the claims, which shall belong to the protection scope of the present application.

Claims

1. An anti-glare rearview mirror comprising a liquid crystal cell and a reflective layer; the liquid crystal cell comprises, arranged from front to back, a first glass plate, a liquid crystal layer, and a second glass plate, the liquid crystal layer being nematic liquid crystal sandwiched between the first and second glass plates; a first transparent electrode is provided on the side of the first glass plate proximate to the liquid crystal layer, and a second transparent electrode is provided on the side of the second glass plate proximate to the liquid crystal layer; an electrode overlap region exists between the second transparent electrode and the first transparent electrode to form a light control region; the mirror is characterized in that: The reflective layer is arranged on the front side or the rear side of the second glass plate; the liquid crystal layer is doped with a secondary dye and a chiral agent, and the liquid crystal layer has a liquid crystal twist angle in an OFF state, which is greater than 90° and less than 160°.

2. The anti-glare rearview mirror according to claim 1, characterized in that: The liquid crystal twist angle is 100°-150°.

3. The anti-glare rearview mirror according to claim 1, characterized in that: The first glass plate and the second glass plate are ITO glass plates.

4. The anti-glare rearview mirror according to claim 1, characterized in that: The side of the first glass plate close to the liquid crystal layer and the side of the second glass plate close to the liquid crystal layer are both coated with a PI alignment layer.

5. The anti-glare rearview mirror according to claim 1, characterized in that: The edge portion of the first glass plate and the edge portion of the second glass plate are bonded to each other via a sealing rubber ring, and the sealing rubber ring is provided with a filling port and a sealing glue for sealing the filling port.

6. The anti-glare rearview mirror according to claim 5, characterized in that: A silicon ball is arranged in the sealing rubber ring.

7. The anti-glare rearview mirror according to claim 1, characterized in that: A plurality of plastic spacer particles are evenly arranged in the liquid crystal layer.

8. The anti-glare rearview mirror according to any one of claims 1 to 7, characterized in that: The reflective layer is arranged on the rear side of the second glass plate, and the reflective layer is an aluminum layer; the anti-glare rearview mirror also includes a first molybdenum layer and a second molybdenum layer, the first molybdenum layer is sandwiched between the second glass plate and the aluminum layer, and the second molybdenum layer is arranged on the rear side of the aluminum layer.

9. The anti-glare rearview mirror according to any one of claims 1 to 7, characterized in that: The reflective layer is arranged on the front side of the second glass plate, and the reflective layer is an aluminum layer; the anti-glare rearview mirror also includes a first molybdenum layer and a second molybdenum layer, the first molybdenum layer is sandwiched between the second glass plate and the aluminum layer, and the second molybdenum layer is arranged on the front side of the aluminum layer.

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