CN201400130Y - Anti-glare rearview mirror - Google Patents

Abstract

The utility model discloses an anti-glare rearview mirror, which comprises a first substrate and a second substrate, a first conductive layer and a second conductive layer arranged on the inner surface of the first substrate and the second substrate, and a first conductive layer and a second conductive layer arranged on the inner surface of the first substrate and the second substrate. The first alignment layer and the second alignment layer on the second conductive layer, the peripheral edges of the first substrate and the second substrate are provided with a frame sealant, and the first substrate, the second substrate and the frame sealant form a sealed cavity, The sealed cavity contains liquid crystals, the outer surface of the second substrate is provided with a reflective layer, the inner surface of the second substrate is a curved surface, and the first and second substrates have the same refractive index as the long axis direction of liquid crystal molecules. In the liquid crystal anti-glare rearview mirror designed by the utility model, when the liquid crystal molecules are not driven, the liquid crystal molecules present an irregular arrangement, and the short axis of the liquid crystal molecules is different from the refractive index of the second substrate, so that the incident light in the second substrate The curved surface is scattered, which weakens the light intensity of the outgoing light reaching the observer's eyes, achieving the anti-glare effect and high contrast.

Description

Anti-glare rearview mirror

【Technical field】

The utility model belongs to the field of vehicle rearview mirrors, in particular to an anti-glare rearview mirror.

【Background technique】

At present, with the continuous development of the automobile industry and the continuous enrichment and improvement of auto parts, automobile rearview mirrors, as a necessary part for safe driving of automobiles, have attracted more and more attention. Anti-glare rearview mirrors are used as a high-end automobile Parts have been embraced by many. At present, the anti-dazzling rearview mirrors can be mainly divided into two categories: manual anti-dazzle and automatic anti-dazzle, and the products of automatic anti-dazzle are mainly electrochromic. Electro-induced anti-glare rearview mirrors have certain disadvantages: long response time, high price, and complicated manufacturing process. In order to solve the aforementioned problems, according to the characteristics of liquid crystals, a new type of liquid crystal anti-glare rearview mirror has appeared at this stage.

Most of the liquid crystal anti-glare rearview mirrors at this stage are still in their infancy, and there are few products on the market. And according to its basic principle, guest-host liquid crystals are used, and the dye molecules mixed in the liquid crystals are used to control the light transmittance, thereby reducing the amount of light reflection, weakening the stimulation of strong light on the human eye, and achieving the anti-glare effect. However, the contrast ratio of the guest-host liquid crystal in the anti-glare and non-dazzling states (referring to the ratio between the reflectivity in the non-dazzling and anti-dazzling states) is not high, because the guest-host liquid crystal absorbs through the long and short axis of the dye. The light intensity is different to achieve the two states of anti-glare and non-glare. In the anti-glare state, the reflectivity is also reduced in the non-anti-glare state, because to reduce the reflectivity in the anti-glare state is to increase Dye solubility or increasing the thickness of the box also increases the dye, which increases the absorption in the non-glare state, which is contrary to the normal state, that is, the high reflectivity in the non-glare state. The contrast in the two states of anti-glare is not high.

【Content of invention】

The technical problem to be solved by the utility model is to provide an anti-dazzling rearview mirror, which solves the technical problem that the contrast of the existing anti-dazzling rearview mirror is not high in the two states of anti-dazzling and non-dazzling.

The utility model is achieved through the following technical solutions:

An anti-glare rearview mirror, comprising a first substrate and a second substrate, a first conductive layer and a second conductive layer arranged on the inner surface of the first substrate and the second substrate, and a first conductive layer and a second conductive layer arranged on the inner surface of the first substrate and the second substrate On the first alignment layer and the second alignment layer, the peripheral edges of the first substrate and the second substrate are provided with a frame sealant, and the first substrate, the second substrate and the frame sealant form a sealed cavity, and the sealed cavity The liquid crystal is contained inside, and the outer surface of the second substrate is provided with a reflective layer, wherein the inner surface of the second substrate is a curved surface, and the first and second substrates have the same refractive index as the long axis direction of the liquid crystal molecules.

In the present utility model, by designing the inner surface of the second substrate as a curved surface, the refractive index of the first substrate and the second substrate in the direction of the long axis of the liquid crystal molecules are the same, and the liquid crystal anti-glare rearview mirror according to this design, When the liquid crystal molecules are driven and not driven, the alignment of the liquid crystal molecules is different, and the refractive index of the long and short axes of the liquid crystal molecules is different. When the liquid crystal molecules are not driven, the liquid crystal molecules will be arranged irregularly. After the incident light is refracted by the short axis of the liquid crystal molecules, it will form scattered light and shoot to the inner surface of the second substrate, and then reach the reflection of the outer surface. The layer is reflected back again, so that part of the incident light and the other part of the reflected light are scattered on the inner surface of the second substrate, that is, the irregular curved surface, thereby weakening the light intensity of the outgoing light reaching the observer's eyes and achieving anti-glare effect. Effect. In the anti-glare state of the utility model, the light is scattered, the loss is large, and the reflectivity is low; in the non-glare state, the light is not scattered, there is no loss, and the reflectivity is high, so the contrast is high.

The features and advantages of the utility model will be described in detail through embodiments in conjunction with the accompanying drawings.

【Description of drawings】

Fig. 1 is the structural representation of the anti-glare rearview mirror provided by the embodiment of the utility model;

Fig. 2 is a schematic diagram of the optical path of the anti-glare rearview mirror provided by the embodiment of the present invention under the condition of not being driven;

Fig. 3 is a schematic diagram of the optical path of the anti-glare rearview mirror provided by the embodiment of the present invention under the driving condition.

【Detailed ways】

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Please refer to shown in Fig. 1: a kind of anti-glare rearview mirror, comprises first substrate 11 and second substrate 12, is located at the first conductive layer 13 and the second conductive layer of first substrate 11 and second substrate 12 inner surfaces 14, the first alignment layer 15 and the second alignment layer 16 arranged on the first conductive layer 13 and the second conductive layer 14, the peripheral edge of the first substrate 11 and the second substrate 12 is provided with a frame sealant 17, the second A substrate 11, a second substrate 12, and a frame sealant 17 form a sealed cavity, and liquid crystals 18 are accommodated in the sealed cavity, and a reflective layer 19 is provided on the outer surface of the second substrate 12, wherein the second substrate 12 The inner surface of the substrate is a curved surface, and the first substrate 11 and the second substrate 12 have the same refractive index as the long axis direction of the liquid crystal molecules.

The first substrate and the second substrate have the same refractive index in the long-axis direction of the liquid crystal molecules. From the characteristics of liquid crystals, it can be known that the refractive index of liquid crystal molecules in the long-axis direction and the short-axis direction is different, and the refractive index along the long-axis direction should be It is larger than the refractive index along the short axis direction, which is the birefringence phenomenon of liquid crystal. Therefore, the refractive indices of the first substrate and the second substrate are different from those of the short axis of the liquid crystal. The refractive index between the first substrate and the second substrate and the long axis direction of the liquid crystal molecules is 1.5-1.9.

The inner surface of the second substrate is a curved surface, and the curved surface is an uneven curved surface. As a specific embodiment, the structure of the curved surface may be a zigzag undulating curved surface structure.

The first substrate 11, the second substrate 12 and the frame sealant 17 form a sealed cavity, and the sealed cavity contains a liquid crystal 18, the liquid crystal can be a positive polarity or a negative polarity liquid crystal, preferably a positive polarity liquid crystal, the said Positive polarity liquid crystals are nematic liquid crystals.

The first substrate and the second substrate can be commonly used substrates in anti-glare rearview mirrors, as long as they are good in light transmission, easy to form electrodes on the surface of the substrates, and have a certain hardness. For example, it may be one or more of glass, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, etc., preferably glass. The first conductive layer and the second conductive layer are transparent conductive layers, and the transparent conductive layer is preferably a transparent conductive metal oxide layer. The transparent conductive metal oxide can be a variety of transparent conductive metal oxides that can be used for conduction, such as one or more of indium tin oxide, tin oxide, tin oxide doped with antimony, zinc oxide, and zinc oxide doped with aluminum. species, preferably indium tin oxide (Indium Tin Oxides, ITO). The first alignment layer and the second alignment layer are commonly used alignment materials, such as polyimide (Polyimide, PI). The reflective layer may be a commonly used metal layer with reflective function, such as silver, aluminum and the like.

The realization process of the utility model anti-glare rearview mirror will be described below in conjunction with the accompanying drawings:

Please refer to FIG. 2 , which is a schematic diagram of the optical path of liquid crystal molecules without driving. Under the action of the anchor force of the first alignment layer and the second alignment layer, the liquid crystal molecules are arranged along the grooves of the alignment layer, presenting an irregular arrangement. When a beam of light enters the anti-glare rearview mirror from the air, the light will be refracted along the direction of the short axis of the liquid crystal molecules. The refractive index of the short axis of the liquid crystal molecules is different from that of the first substrate and the second substrate. After the light is refracted by the short axis of the liquid crystal molecules, it cannot match the uneven curved surface of the inner surface of the second substrate, and scattered light will be directed to the inner surface of the second substrate, and then reach the reflective layer on the outer surface and be reflected back, so that A part of the incident light and another part of the reflected light are scattered on the inner surface of the second substrate, that is, the irregular curved surface, thereby weakening the light intensity of the outgoing light reaching the observer's eyes and achieving an anti-glare effect.

Please refer to FIG. 3 , which is a schematic diagram of the optical path of the liquid crystal molecules when they are driven. Under the action of the electric field force of the first conductive layer and the second conductive layer, the long axes of the liquid crystal molecules are arranged along the direction of the electric field, that is, arranged perpendicular to the first substrate and the second substrate, presenting a regular arrangement. When a beam of light enters the anti-glare rearview mirror from the air, the light will be refracted along the direction of the long axis of the liquid crystal molecules. The refractive index of the long axis of the liquid crystal molecules is the same as that of the first substrate and the second substrate. After the refraction of the long axis of the liquid crystal molecules, it can match the uneven curved surface of the inner surface of the second substrate. At this time, the first substrate, the second substrate and the liquid crystal molecules can be regarded as a kind of material, and the light after refraction travels along a straight line. Scattering does not occur, forming direct light to the inner surface of the second substrate, and then reaching the reflective layer on the outer surface and then reflecting back, so that the incident light and the reflected light are not on the inner surface of the second substrate, that is, the irregular curved surface Scattering, still a beam of strong light, this situation is used for non-glare-proof occasions.

In the present utility model, by designing the inner surface of the second substrate as a curved surface, the refractive index of the first substrate and the second substrate in the direction of the long axis of the liquid crystal molecules are the same, and the liquid crystal anti-glare rearview mirror according to this design, When the liquid crystal molecules are driven and not driven, the alignment of the liquid crystal molecules is different, and the refractive index of the long and short axes of the liquid crystal molecules is different. When the liquid crystal molecules are not driven, the liquid crystal molecules will be arranged irregularly. After the incident light is refracted by the short axis of the liquid crystal molecules, it will form scattered light and shoot to the inner surface of the second substrate, and then reach the reflection of the outer surface. The layer is reflected back again, so that part of the incident light and the other part of the reflected light are scattered on the inner surface of the second substrate, that is, the irregular curved surface, thereby weakening the light intensity of the outgoing light reaching the observer's eyes and achieving anti-glare effect. Effect. In the anti-glare state of the utility model, the light is scattered, the loss is large, and the reflectivity is low; in the non-glare state, the light is not scattered, there is no loss, and the reflectivity is high, so the contrast is high.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (5)

1. An anti-glare rearview mirror, comprising a first substrate and a second substrate, a first conductive layer and a second conductive layer arranged on the inner surface of the first substrate and the second substrate, and a first conductive layer and a second conductive layer arranged on the inner surface of the first substrate and the second substrate. The first alignment layer and the second alignment layer on the conductive layer, the peripheral edges of the first substrate and the second substrate are provided with a frame sealant, and the first substrate, the second substrate and the frame sealant form a sealed cavity, and the Liquid crystal is contained in the sealed cavity, and the outer surface of the second substrate is provided with a reflective layer. It is characterized in that the inner surface of the second substrate is a curved surface, and the first substrate and the second substrate have the same refractive index as the long axis direction of the liquid crystal molecules. . 2. The anti-glare rearview mirror according to claim 1, characterized in that, the refractive index between the first substrate and the second substrate and the long axis direction of the liquid crystal molecules is 1.5-1.9. 3. The anti-glare rearview mirror according to claim 1, wherein the curved surface is a jagged undulating curved surface. 4. The anti-glare rearview mirror according to claim 1, wherein the liquid crystal is positive polarity liquid crystal. 5. The anti-glare rearview mirror according to claim 4, characterized in that the positive polarity liquid crystal is a nematic liquid crystal.

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