Frameless anti-dazzle rearview mirror and manufacturing method thereof

Abstract

The frameless anti-dazzle rearview mirror comprises an absorption type polarizing layer, a liquid crystal dimming layer and a reflection type polarizing layer which are sequentially arranged from one side of an observer, and the liquid crystal dimming layer comprises a first transparent substrate, a first transparent electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a second transparent electrode and a second transparent substrate which are sequentially arranged; the first transparent substrate is adjacent to the absorption type polarization layer, the first transparent substrate and the second transparent substrate correspond to each other in position up and down, the edge of the first transparent substrate is provided with a step part exceeding the second transparent substrate, and the frameless anti-dazzle rearview mirror further comprises electrode connecting wires electrically connected with the first transparent electrode and the second transparent electrode respectively. The electrode connecting line is located on the step portion and fixed to the side, facing the second transparent substrate, of the first transparent substrate. The frameless anti-dazzle rearview mirror has the advantages that ghosting is avoided, the anti-dazzle speed is high, and the mirror surface utilization efficiency is high; the manufacturing method is simple in process and low in production cost.

Description

Technical Field

[0001] The invention relates to the technical field of automobile accessories, and in particular to a frameless anti-glare rearview mirror and a manufacturing method thereof. Background Art

[0002] At present, traditional rearview mirrors in cars not only have a single function, but also have a severely limited view of the road behind. Therefore, streaming media rearview mirrors with display screens have gradually become popular in recent years. Simply put, streaming media rearview mirrors capture road conditions behind the car through a rear-pull camera installed at the rear of the car, and transmit them to the display screen in the rearview mirror in real time. The driver and passengers can know the road conditions behind by watching the display screen. Compared with traditional mirror-reflective rearview mirrors, streaming media rearview mirrors have a wider field of view and also have better effects in rainy and foggy weather.

[0003] Although streaming media rearview mirrors have developed rapidly in the industry in recent years and related products are numerous, there are still many problems that affect safety and experience that need to be solved, such as ghosting, low display brightness, severe heat generation, high cost, complex installation, low adaptability, no automatic anti-glare or slow anti-glare speed, and complex operation. On the other hand, most of the current streaming media rearview mirrors have borders and are blocked around, which reduces the visible area of ​​the rearview mirror and affects the appearance. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems existing in the prior art and to provide a frameless anti-glare rearview mirror and a manufacturing method thereof.

[0005] The present invention adopts the following technical solutions:

[0006] A frameless anti-glare rearview mirror, the frameless anti-glare rearview mirror comprises an absorption polarizing layer, a liquid crystal dimming layer and a reflection polarizing layer which are arranged in sequence from the observer side, the liquid crystal dimming layer comprises a first transparent substrate, a first transparent electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a second transparent electrode and a second transparent substrate which are arranged in sequence, the first transparent substrate is adjacent to the absorption polarizing layer, the first transparent substrate and the second transparent substrate correspond in position up and down, the first transparent substrate has a step portion at the edge thereof which exceeds the position of the second transparent substrate, the frameless anti-glare rearview mirror also comprises an electrode connecting line which is electrically connected to the first transparent electrode and the second transparent electrode respectively, the electrode connecting line is located at the step portion and is fixed to the side of the first transparent substrate facing the second transparent substrate.

[0007] Preferably, it also includes an ink layer located on the side of the absorption-type polarizing layer away from the first transparent substrate.

[0008] Preferably, the ink in the ink layer is mirror silver ink or metallic ink, and the width of the ink layer is in the range of 1.0 mm-10 mm.

[0009] Preferably, the electrode connecting wire is an FPC board.

[0010] Preferably, the FPC board includes an inner area and an outer area connected to the inner area, the inner area includes a gold finger area and a PAD area, the gold finger area includes a first gold finger area and a second gold finger area, the first gold finger area is electrically connected to the first transparent electrode, and the second gold finger area is electrically connected to the second transparent electrode, the PAD area includes a first PAD area and a second PAD area, the first PAD area is electrically connected to the first gold finger area, and the second PAD area is electrically connected to the second gold finger area.

[0011] Preferably, a cutting line is provided at the connection between the outer area and the inner area to facilitate subsequent cutting and removal of the outer area, and the cutting line is flush with the edge of the first transparent substrate or located inside the edge of the first transparent substrate.

[0012] Preferably, the frameless anti-glare rearview mirror also includes at least one light sensor and a control unit, wherein the light sensor detects changes in ambient light and feeds back information to the control unit, and the control unit electronically adjusts the voltage applied to the liquid crystal layer according to the information.

[0013] Preferably, the light sensor includes a front light sensor facing the front of the frameless anti-glare rearview mirror and a rear light sensor facing the rear of the frameless anti-glare rearview mirror.

[0014] Preferably, the frameless anti-glare rearview mirror also includes a front camera module, a front camera adapter cable, a rear camera module and a rear camera adapter cable, the front camera module is connected to the control unit via the front camera adapter cable, and the rear camera module is connected to the control unit via the rear camera adapter cable.

[0015] Preferably, the frameless anti-glare rearview mirror further comprises a display module located on a side of the reflective polarizing layer away from the liquid crystal dimming layer.

[0016] Preferably, the frameless anti-glare rearview mirror further comprises a back hook and a strap located on the back of the observer.

[0017] Preferably, the frameless anti-glare rearview mirror also includes a speaker and a microphone, which are used for sending and receiving sound signals respectively.

[0018] On the other hand, a method for manufacturing a frameless anti-glare rearview mirror is provided, comprising the steps of: a. providing a liquid crystal dimming layer, the liquid crystal dimming layer comprising a first transparent substrate, a first transparent electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a second transparent electrode and a second transparent substrate arranged in sequence, the first transparent substrate being adjacent to the absorption-type polarizing layer, the first transparent substrate and the second transparent substrate corresponding in position up and down, and the first transparent substrate having a step portion at an edge thereof exceeding the position of the second transparent substrate; b. forming electrode connecting lines electrically connected to the first transparent electrode and the second transparent electrode in the liquid crystal dimming layer, and a binding device grabs the outer area of ​​the electrode connecting lines for alignment c. cutting and removing the outer area of ​​the electrode connecting line; d. providing an absorption type polarizing layer, forming an ink layer on one side of the absorption type polarizing layer, and then attaching the side of the absorption type polarizing layer away from the ink layer to the liquid crystal dimming layer, or first attaching the absorption type polarizing layer to the liquid crystal dimming layer, and then forming an ink layer on the side of the absorption type polarizing layer away from the liquid crystal dimming layer; e. attaching a reflective polarizing layer on the other side of the liquid crystal dimming layer.

[0019] Preferably, the polarization direction of the absorption axis of the absorption-type polarizing layer and the polarization direction of the reflection axis of the reflective polarizer are parallel to or perpendicular to each other.

[0020] Preferably, a cutting line is provided at the connection between the outer area and the inner area to facilitate subsequent cutting and removal of the outer area, and the cutting line is flush with the edge of the first transparent substrate or located inside the edge of the first transparent substrate.

[0021] Preferably, in step b, the first transparent electrode is directly electrically connected to the electrode connecting line, and the second transparent electrode is electrically connected to the electrode connecting line via a conductive object disposed between the first transparent substrate and the second transparent substrate.

[0022] Preferably, the conductive object is a conductive gold ball.

[0023] The frameless anti-glare rearview mirror of the present invention has no double images, fast anti-glare speed and high mirror surface utilization efficiency; the manufacturing method of the frameless anti-glare rearview mirror of the present invention has simple process and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The invention may be better understood by reference to the accompanying drawings which illustrate embodiments of the invention, in which:

[0025] Figure 1is a schematic cross-sectional structure diagram of a frameless anti-glare rearview mirror according to a specific embodiment of the present invention;

[0026] Figure 2 is a schematic structural diagram of a side of an electrode connection line close to a first transparent electrode in a frameless anti-glare rearview mirror according to a specific embodiment of the present invention;

[0027] Figure 3 is a schematic structural diagram of a side of an electrode connection line in a frameless anti-glare rearview mirror in a specific embodiment of the present invention that is away from a first transparent electrode;

[0028] Figure 4 It is a schematic diagram of the connection structure of the control unit and various parts in the frameless anti-glare rearview mirror of a specific embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of the back hook and strap structure in a frameless anti-glare rearview mirror in a specific embodiment of the present invention;

[0030] Figure 6 It is a structural schematic diagram of a special car-specific back plate in a frameless anti-glare rearview mirror in a specific embodiment of the present invention;

[0031] Figure 7 Schematic diagram of the optical path of the frameless anti-glare rearview mirror of a specific embodiment of the present invention when it is in a streaming media display working state with the lowest reflectivity and the highest transmittance;

[0032] Figure 8 is a schematic diagram of the light path of a frameless anti-glare rearview mirror in a specific embodiment of the present invention when it is in an anti-glare state;

[0033] Figure 9 It is a schematic diagram of the light path of the frameless anti-glare rearview mirror of a specific embodiment of the present invention when it is in a mirror state with the highest reflectivity and the lowest transmittance. DETAILED DESCRIPTION

[0034] In the following description, a large number of specific details are set forth for the purpose of explanation so as to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without these specific details. The illustrative exemplary embodiments listed in the present invention are only for illustration and do not limit the present invention. Therefore, the protection scope of the present invention is not limited by the specific embodiments, but only by the scope of the attached claims.

[0035] The frameless anti-glare rearview mirror according to a specific embodiment of the present invention is described in detail below with reference to the accompanying drawings. Figure 1 is a schematic cross-sectional structure diagram of a frameless anti-glare rearview mirror according to a specific embodiment of the present invention, Figure 1As shown in the figure, the frameless anti-glare rearview mirror of the specific embodiment of the present invention includes an absorption-type polarizing layer 11, a liquid crystal dimming layer 12, and a reflection-type polarizing layer 13 sequentially arranged from the side of the observer. The liquid crystal dimming layer 12 includes a first transparent substrate 121, a first transparent electrode 122, a first alignment layer 123, a liquid crystal layer 124, a second alignment layer 125, a second transparent electrode 126, and a second transparent substrate 127 arranged in sequence. The first transparent substrate 121 is located on the side of the observer of the liquid crystal dimming layer 12. The first transparent substrate 121 and the second transparent substrate 127 are vertically corresponding in position. There is a stepped portion A1 at the edge of the first transparent substrate 121 whose position exceeds that of the second transparent substrate 127. The frameless anti-glare rearview mirror further includes electrode connection lines 14 electrically connected to the first transparent electrode 122 and the second transparent electrode 126 respectively. The electrode connection lines 14 are located on the stepped portion A1 and fixed to the side of the first transparent substrate 121 facing the second transparent substrate 127. In the specific embodiment of the present invention, the absorption-type polarizing layer 11 absorbs light whose polarization direction is consistent with the absorption axis polarization direction of the absorption-type polarizing layer, and allows light whose polarization direction is perpendicular to the absorption axis of the absorption-type polarizing layer to pass through. The liquid crystal dimming layer 12 is arranged under the absorption-type polarizing layer 11. The reflection-type polarizing layer 13 is arranged under the liquid crystal dimming layer 12 with substantially the same size as the liquid crystal dimming layer 12. The reflection-type polarizing layer 13 reflects light whose polarization direction is consistent with the reflection axis polarization direction of the reflection-type polarizing layer, and allows light whose polarization direction is perpendicular to the reflection axis polarization direction of the reflection-type polarizing layer to pass through. Among them, the absorption axis polarization direction of the absorption-type polarizing layer 11 and the reflection axis polarization direction of the reflection-type polarizer are parallel or perpendicular to each other. The reflection-type polarizing layer 13 can be selected from, for example, an APF film, an RPM film, a DBEF film, or a metal wire mesh reflection-type polarizing film, etc. In this embodiment, in the first transparent substrate 121 and the second transparent substrate 127 that are vertically corresponding in position, most of their areas overlap vertically. Due to the stepped portion A1 at the edge of the first transparent substrate 121 whose position exceeds that of the second transparent substrate 127, that is, there is a stepped portion A1 on the first transparent substrate 121 where the first transparent substrate 121 and the second transparent substrate 127 do not overlap. The electrode connection lines 14 are fixed at the position of the stepped portion A1, and the electrode connection lines 14 are fixed to the side of the first transparent substrate 121 facing the second transparent substrate 127.In this embodiment, the size of the first transparent substrate 121 is set to be larger than that of the second transparent substrate 127. A stepped portion A1 is provided at the edge of the first transparent substrate 121, and the electrode connection line 14 is disposed at the position of this stepped portion, which can achieve fast and effective circuit connection without affecting the use of this area as an effective area such as an anti-glare surface. In addition, compared with the traditional connection method, the stability of the circuit connection can be effectively enhanced and the circuit failure rate can be reduced in this embodiment. Compared with other connection methods such as folding the circuit backward after wiring, the connection method of this embodiment has more reliable and stable performance. In addition, while enhancing the overall space utilization rate of the frameless anti-glare rearview mirror, the overall aesthetics is improved, making the layout more reasonable and compact.

[0036] As Figure 1 shown, in this embodiment, the frameless anti-glare rearview mirror further includes an ink layer 15 located on the side of the absorption-type polarizing layer 11 away from the liquid crystal dimming layer 12. In this embodiment, since there is a frame adhesive 128 in the liquid crystal dimming layer, the main function of the frame adhesive 128 is to prevent liquid crystal leakage, support and connect the first transparent substrate 121 and the second transparent substrate 127. However, if viewed from the front, since the area with the frame adhesive 128 cannot achieve the same color as the effective display area of the liquid crystal dimming layer, and the shape of the frame adhesive 128 is relatively irregular, it will greatly affect the visual effect of the frameless anti-glare rearview mirror. In the prior art, in order to improve the visual effect, a glass cover plate with silk printing is often added on the surface of the absorption-type polarizing layer, but this will undoubtedly greatly increase the cost. In this embodiment, by silk printing ink in the peripheral area around the absorption-type polarizing layer 11, the function of the ink layer is to block the area occupied by the frame adhesive 128 around the liquid crystal dimming layer 12, achieving the effect of hiding the frame adhesive area. In this embodiment, preferably, the ink in the ink layer 15 is mirror silver ink or metallic color ink. Using mirror silver ink or metallic color ink can make the area of the ink layer in the frameless anti-glare rearview mirror of this embodiment basically the same as the area without the ink layer when in the mirror mode. The effect presented after the ink layer is silk printed is preferably a mirror silver effect or other effects with high metallic gloss, so as to achieve a color similar to that of other areas (other effective display areas), so that the frameless anti-glare rearview mirror achieves an integrated effect, and the trace of the ink will not be significantly seen due to the presence of the ink layer around, thus affecting the aesthetics. In this embodiment, the width of the ink layer 15 is in the range of 1.0 mm - 10 mm. However, the present invention is not limited thereto, and the ink layer 15 can also use traditional ink materials without specific limitation.

[0037] Figure 2 is a schematic structural diagram of the electrode connection line in the frameless anti-glare rearview mirror according to a specific embodiment of the present invention, close to the first transparent electrode side, Figure 3 is a schematic structural diagram of the electrode connection line in the frameless anti-glare rearview mirror according to a specific embodiment of the present invention, away from the first transparent electrode side. AsFigure 2 and Figure 3 As shown in Figure 3 , in this embodiment, the electrode connection line 14 is an FPC board. The FPC board 14 includes an inner region 141 and an outer region 142 connected to the inner region 141. In this embodiment, the inner region 141 includes a gold finger region 1411 and a PAD region 1412. The gold finger region 1411 includes a first gold finger region 14111 and a second gold finger region 14112. The first gold finger region 14111 is electrically connected to the first transparent electrode 122, and the second gold finger region 14112 is electrically connected to the second transparent electrode 126. The PAD region 1412 includes a first PAD region 14121 and a second PAD region 14122. The first PAD region 14121 is electrically connected to the first gold finger region 14111, and the second PAD region 14122 is electrically connected to the second gold finger region 14112. In this embodiment, the first transparent electrode 122 is directly electrically connected to the FPC board 14. Specifically, the first transparent electrode 122 is directly electrically connected to the first gold finger region 14111 on the FPC board 14, and the first gold finger region 14111 is electrically connected to the first PAD region 14121 through the conductive layer (such as a copper foil layer) of the FPC board 14 itself. In this embodiment, the second transparent electrode 126 is electrically connected to the FPC board 14 through a conductive object disposed between the first transparent substrate 121 and the second transparent substrate 127. Specifically, the second transparent electrode 126 is directly electrically connected to a partial conductive layer located on the first transparent substrate 121 through a conductive object (such as a conductive gold ball). This partial conductive layer is electrically connected to the second gold finger region 14112 on the FPC board 14, and the second gold finger region 14112 is electrically connected to the second PAD region 14122 through the conductive layer (such as a copper foil layer) of the FPC board 14 itself. That is, the PAD region is preferably a metal reserved pad. The gold finger region and the PAD region are the front and back sides of the electrode connection line, and the two are electrically connected. In this embodiment, the first PAD region 14121 and the second PAD region 14122 are used as connection parts for reconnecting to the control unit and are electrically connected to the control unit. However, the present invention is not limited thereto. The electrode connection method of the electrode connection line can also adopt connection methods such as metal pin connection and zebra paper connection.

[0038] In the present invention, since the anti-glare rearview mirror is a frameless anti-glare rearview mirror, the size of the first transparent substrate 121 is set to be larger than that of the second transparent substrate 127. All areas of the first transparent substrate 121 can be used as a mirror surface. At the same time, in order to facilitate hiding the connection wires, a stepped portion A1 whose position exceeds the second transparent substrate 127 is provided at the edge of the first transparent substrate 121, and the electrode connection wire 14 is arranged at the position of this stepped portion, which saves space and improves the service life and reliability of the electrode connection wire. When observing the frameless anti-glare rearview mirror of the present invention from the front, in order to avoid the visible presence of the electrode connection wire from affecting the visual effect, silk-screen printing ink on the outer surface of the absorption-type polarizing layer can hide the area where the electrode connection wire is located and the frame adhesive area in the display module. In addition, the frameless anti-glare rearview mirror is electrode-connected from the side of the first transparent substrate 121 facing away from the absorption-type polarizing layer (i.e., the side facing away from the observer), which can hide the electrode connection wire and achieve the effect that the entire first transparent substrate 121 can be used as a mirror surface when the observer observes the frameless anti-glare rearview mirror from the outside. In addition, the outermost side of the frameless anti-glare rearview mirror of the present invention close to the observer is an absorption-type polarizing film. Compared with the traditional rearview mirror whose outermost side close to the observer uses glass, the frameless anti-glare rearview mirror of the present invention will not have a ghosting phenomenon, greatly improving the mirror surface effect. The frameless design is combined with the silk-screened ink layer, increasing the effective use area of the mirror surface. Compared with the anti-glare rearview mirrors in the prior art, it has no ghosting and a more excellent anti-glare effect.

[0039] In this embodiment, as Figure 3 shown, preferably, a cutting line 143 is provided at the connection between the outer region 142 and the inner region 141, which is convenient for subsequent cutting and removing the outer region 142. Preferably, the cutting line 143 is flush with the edge of the first transparent substrate 121 or located inside the edge of the first transparent substrate 121, so that the remaining part of the electrode connection wire after being cut is hidden within the range covered by the first transparent substrate 121, thereby making the edge part of the first transparent substrate 121 look beautiful from the outside and facilitating subsequent assembly. In this embodiment, the outer region 142 is provided to facilitate machine grasping of the FPC board 14 and accurate alignment during binding of the FPC board 14 in the manufacturing process. The outer region 142 in this embodiment does not include connection lines and is not used as a connection wire functional component. However, the present invention is not limited thereto. There may not be a specific cutting line 143 between the outer region 142 and the inner region 141, and the shape and structure of the outer region 142 are not limited to Figure 2 and 3 shown, and it can also be other shapes and structures, as long as it can meet the grasping and positioning binding of the FPC board 14, which will not be elaborated here.

[0040] Figure 4Schematic diagram of the connection structure between the control unit and various parts in the frameless anti-glare rearview mirror according to a specific embodiment of the present invention, as Figure 4 shown, in the frameless anti-glare rearview mirror of this embodiment, it further includes at least one light sensor 16 and a control unit 17. The light sensor 16 detects changes in ambient light and feeds back information to the control unit 17. The control unit 17 electronically controls and adjusts the voltage applied to the liquid crystal layer according to the detected change information of the ambient light. In this embodiment, preferably, the light sensor 16 includes a front light sensor facing the front of the frameless anti-glare rearview mirror and a rear light sensor facing the rear of the frameless anti-glare rearview mirror. The front light sensor and the rear light sensor are operably connected to the control unit 17. Specifically, the front light sensor constantly senses changes in ambient light intensity. When the ambient light intensity drops below a certain value (night state or entering a dark environment), the front light sensor sends signal ① to the control unit 17. When the control unit 17 receives signal ①, the rear light sensor starts to detect the light intensity from behind the vehicle. If it detects that the light intensity from behind the vehicle is greater than a certain value (for example, the vehicle behind turns on the high beam), the rear light sensor sends signal ② to the control unit 17. After the control unit 17 receives signal ②, the control unit outputs voltage to the first transparent electrode 122 and the second transparent electrode 126 on both sides of the liquid crystal dimming layer 12. By applying different voltages to the liquid crystal molecules in the liquid crystal dimming layer 12 through the control unit 17, the arrangement structure of the liquid crystal molecules is adjusted, thereby adjusting the polarization direction of the light passing through the liquid crystal dimming layer, so that the mirror reflectivity of the frameless anti-glare rearview mirror is reduced, achieving the anti-glare effect. When the strong light from behind the vehicle disappears, the control unit 17 controls the mirror reflectivity of the rear frameless anti-glare rearview mirror to increase and automatically return to the normal state. In this embodiment, the front light sensor and the rear light sensor are, for example, patch-type or plug-in light sensors.

[0041] As Figure 4As shown in the figure, the frameless anti-glare rearview mirror of this embodiment further includes a front camera module 18, a front camera patch cord, a rear camera module 19 and a rear camera patch cord. The front camera module 18 is connected to the control unit 17 through the front camera patch cord, and the rear camera module 19 is connected to the control unit 17 through the rear camera patch cord. Further, the front camera module 18 includes a front lens module, a front camera front cover, a front camera rear cover, a front camera bracket, and a front camera decorative part. The front lens module 18 is operably connected to the control unit 17 through a front camera connection line. The control unit 17 can send various instructions to the front camera module 18, and the front camera module 18 executes instructions such as shooting / transmitting the road conditions ahead. In this embodiment, the front camera module 18 and the housing of the frameless anti-glare rearview mirror are tightly assembled together to form an integrated design; in another preferred solution, the front camera module 18 and the housing of the frameless anti-glare rearview mirror are independent of each other, and the front camera module 18 is operably fixed at the position of the front windshield of the vehicle or other positions. The rear camera module 19 includes a rear lens module, a rear camera front cover, a rear camera rear cover, a rear camera bracket, and a rear camera decorative part. The rear camera module 19 is operably connected to the control unit 17 through a front camera connection line. The control unit 17 can send various instructions to the rear camera module 19, and the rear camera module 19 executes instructions such as shooting / transmitting the road conditions behind. As Figure 4 , the control unit 17 is electrically connected to the rear camera module, the rear light sensor, the touch layer, the display module, the liquid crystal dimming mirror surface, the front camera module (including the front light sensor), the microphone, the speaker, and the power supply respectively. The control unit 17 receives the information of each component structure and controls the working state of each component.

[0042] In this embodiment, the control unit 17 can adopt main control chips and system solutions of well-known domestic and foreign manufacturers such as the MSTAR solution system, the Ambarella solution system, the Novatek solution system, the Jieli solution system, the Lingtong solution system, and the Android solution system, which will not be elaborated here.

[0043] In this embodiment, preferably, the front camera module 18 includes a light sensor 16. Preferably, the front camera module 18 serves both as part of the front lens module and as a front light sensor. Specifically, the front camera module 18 contains built-in components such as an image sensor, a highly integrated image processor, an embedded power supply, and a high-quality aspherical lens. Preferably, the image sensor also serves as a front light sensor. In this preferred solution, there is no need to additionally configure a front light sensor. Preferably, the image sensor is a CMOS image sensor or a CCD image sensor. In another preferred solution, a light sensor is additionally configured. For example, the front camera module 18 is installed at a position on the borderless anti-glare rearview mirror housing where the light is not easily blocked. In this embodiment, it also includes a rear light sensor, which is installed at a position on the borderless anti-glare rearview mirror housing where the light is not easily blocked. The light-sensitive surface of the rear light sensor faces the rear of the vehicle to facilitate detecting the light intensity from the rear of the vehicle. In another preferred solution, the rear camera module 19 includes a rear light sensor. The rear camera module 19 serves both as part of the rear lens module and as a rear light sensor. In this preferred solution, there is no need to additionally configure a rear light sensor. Preferably, the image sensor is a CMOS image sensor or a CCD image sensor. In the borderless anti-glare rearview mirror of this embodiment, it further includes a housing, which includes a front housing and a rear housing. Preferably, the lower position of the housing has a protruding structural design, and the rear light sensor is arranged at the protruding position.

[0044] The borderless anti-glare rearview mirror of this embodiment further includes a display module 20 located on the side of the reflective polarizing layer 13 away from the liquid crystal dimming layer 12. Further, the polarization direction of the polarized display light emitted by the display module 20 is perpendicular to the reflection axis polarization direction of the reflective polarizing layer 13. Preferably, the display module 20 is a TFT liquid crystal display screen with a size of 9.2 inches / 9.35 inches / 9.66 inches / 9.88 inches or larger. As Figure 4 shown, in this embodiment, the display module 20 is operably connected to the control unit 17, and the control unit 17 can control the display module 20 to display different contents. For example, the control unit controls the display module to display the road conditions in the front or rear. Therefore, the driver and passengers can observe the road conditions in the front and rear in real time through the display module.

[0045] As Figure 4As shown, preferably, the frameless anti-glare rearview mirror further includes a power supply for supplying power to the control unit 17. Additionally, it also includes a speaker and a microphone. The speaker and the microphone are respectively used for emitting and receiving sound signals. Further, in this embodiment, a microphone hole is provided on the outer shell of the frameless anti-glare rearview mirror. The microphone is installed inside the outer shell and is connected to the control unit 17. When the driver issues a voice command, the microphone converts the received voice signal into an electrical signal. After the control unit 17 receives the electrical signal emitted by the microphone, the control unit 17 issues commands to the display module or other components of the rearview mirror after processing, to implement functions such as turning on / off the display module, adjusting the viewing angle, adjusting the brightness, turning on / off recording, playback, voice broadcast, etc. Further, a speaker hole is provided on the rear shell of the frameless anti-glare rearview mirror. The speaker is installed inside the outer shell and is connected to the control unit 17. When the control unit 17 issues a command to the speaker, the speaker can convert the electrical signal into a sound signal, to achieve human-machine voice interaction, such as playing music, voice navigation, sound warning prompts, etc.

[0046] Figure 5 is a schematic diagram of the back hook and strap structure in the frameless anti-glare rearview mirror of a specific embodiment of the present invention, as Figure 5 shown, in this embodiment, the frameless anti-glare rearview mirror may further include a back hook 200 and a strap 300 detachably connected to the outer shell 100 on the back of the observer. For example, there are two sets of back hook positions on the outer surface of the outer shell 100 of the frameless anti-glare rearview mirror, with two upper and lower back hooks 200 in each set, and each is equipped with an elastic strap 300. When replacing the rearview mirror, hook one end of the strap on one of the back hooks, bypass the original rearview mirror, stretch the strap to an appropriate tightness, and hook the other end of the strap on the other back hook in the same set of back hook positions. The operation method for the other set of back hook positions is the same. With the back hook and strap structure, when the rearview mirror needs to be replaced, the disassembly process of the original mirror can be omitted.

[0047] Figure 6 is a schematic diagram of the structure of the vehicle-specific backplate in the frameless anti-glare rearview mirror of a specific embodiment of the present invention, as Figure 6As shown, further, a detachable vehicle-specific back plate 400 may be provided on the outer surface of the housing 100 of the frameless anti-glare rearview mirror of this embodiment. When it is necessary to remove the original rearview mirror and install the frameless anti-glare rearview mirror, first remove the back hook from the rearview mirror housing, then install the vehicle-specific back plate 400 on the rearview mirror housing, then fix the vehicle-specific bracket to the vehicle-specific card slot with screws, and finally install the vehicle-specific bracket on the front windshield. In this embodiment, preferably, the vehicle-specific back plate is provided with a universal vehicle-specific bracket card slot, which can match the vehicle-specific brackets of most models on the market. In addition, for the convenience of installation, the vehicle-specific back plate can also be removed from the rearview mirror housing, and a back hook and a strap can be installed on the rearview mirror housing. When replacing the rearview mirror, the disassembly process of the original mirror can be omitted.

[0048] In this embodiment, further, a dust-proof sponge may be provided between the display module and the liquid crystal dimming layer. Preferably, the thickness of the dust-proof sponge is between 0.2 mm and 3.0 mm. Preferably, one side of the dust-proof sponge has glue, and the glue surface is attached to the periphery outside the effective display area of the display surface of the display module, playing a role in dust prevention and buffering. Further, an insulating tape or a shielding material is provided inside the frameless anti-glare rearview mirror. The insulating tape or the shielding material is wrapped on the surface of the electrode connection line or the electronic components of the control unit, playing a role in insulation, magnetic field shielding, and anti-electromagnetic interference. Further, a power cord jack is provided on the outer shell of the frameless anti-glare rearview mirror. The power cord is connected to the control unit through the power cord jack to provide power conditions for the control unit. Preferably, the size of the power cord jack is the general specification size of a USB interface or the general specification size of a common round power plug. Preferably, the power cord is a 12V to 5V step-down line. One end of the power cord is connected to the 12V power supply contact point of the vehicle, and the other end provides a 5V power condition for the control unit. Further, a rear camera module adapter jack is provided on the outer shell of the frameless anti-glare rearview mirror. One end of the rear camera module adapter line is connected to the rear camera module, and the other end is connected to the control unit through the rear camera module adapter jack. Preferably, the size of the power cord jack is the general specification size of a USB interface or the general specification size of a common round power plug. Further, an SD card slot is provided on the outer shell of the frameless anti-glare rearview mirror. The SD card is installed in the SD card slot to store the data recorded by the rearview mirror. Further, a GPS module jack is provided on the outer shell of the frameless anti-glare rearview mirror. The frameless anti-glare rearview mirror can implement the GPS function through an external GPS module. Further, a keyhole and a key are provided on the outer shell of the frameless anti-glare rearview mirror. The driver can operate the rearview mirror through the key. Further, a heat dissipation hole is provided on the outer shell of the frameless anti-glare rearview mirror to dissipate the heat generated by each unit in the frameless anti-glare rearview mirror. Further, other external module jacks are provided on the outer shell of the frameless anti-glare rearview mirror. Preferably, the other external modules include an OBD module, an ADAS module, etc. Further, the frameless anti-glare rearview mirror further includes a microphone dust-proof net, a speaker dust-proof net, a heat dissipation hole dust-proof net, etc., to reduce the entry of external pollutants into the interior of the frameless anti-glare rearview mirror. Further, the frameless anti-glare rearview mirror further includes connection lines connecting the display module and the control unit, connection lines connecting the speaker and the control unit, connection lines connecting the microphone and the control unit, connection lines connecting the front camera module and the control unit, etc.

[0049] The working principle of the frameless anti-glare rearview mirror of the present invention will be described below with reference to the accompanying drawings. Figure 7 It is an optical path schematic diagram of the frameless anti-glare rearview mirror in the streaming media display working state with the lowest reflectivity and the highest transmittance in a specific embodiment of the present invention. As Figure 7 shown, when the display module is turned on, the control unit applies a voltage to the liquid crystal dimming layer. Figure 7In it, a represents external natural light. a can be decomposed into polarized lights b and c that are perpendicular to each other. Among them, b represents the polarized light perpendicular to the absorption axis of the absorption-type polarizer layer 11, and c represents the polarized light parallel to the absorption axis of the absorption-type polarizer layer 11. A represents the polarized display light emitted by the display module. A is perpendicular to the polarization direction of the reflection axis of the reflective polarizer. B represents the polarized light parallel to the polarization direction of the reflection axis of the reflective polarizer. When the unpolarized ambient light a is incident on the absorption-type polarizer layer 11, the light c parallel to the absorption axis of the absorption-type polarizer layer 11 is absorbed, and the light b perpendicular to the absorption axis of the absorption-type polarizer layer 11 can pass through and attenuate to b1. When b1 is incident on the liquid crystal dimming layer 12, b1 can pass through the liquid crystal dimming layer 12 and attenuate to b2. When b2 is incident on the reflective polarizer layer 13, b2 passes through the reflective polarizer layer 13 and attenuates to b3. If each layer is an ideal dielectric material, the attenuation of light will tend to zero. It can be seen that at this time, the reflectivity of the external reflection light source reaches the lowest, and the reflectivity is within 10%. When the polarized display light A emitted by the display module is incident on the reflective polarizer layer 13, A can pass through 13 and attenuate to A1. When A1 is incident on the liquid crystal dimming layer 12, A1 can pass through the liquid crystal dimming layer 12 and attenuate to A2; when A2 is incident on the absorption-type polarizer layer 11, A2 can pass through the absorption-type polarizer layer 11 and attenuate to A3. If each layer is an ideal dielectric material, the attenuation of light will tend to zero. It can be seen that at this time, the polarized light emitted by the display module can almost all pass through the liquid crystal dimming mirror surface, and the transmittance can reach 70%-90%. At this time, the borderless anti-glare rearview mirror of the present invention is in a streaming media display state with the lowest reflectivity and the highest transmittance for the display module.

[0050] Figure 8 It is a schematic optical path diagram when the borderless anti-glare rearview mirror in a specific embodiment of the present invention is in an anti-glare state. As Figure 8 shown, when the display module is turned off, the control unit determines whether to enter the anti-glare state according to the signals sent by the front light sensor and the rear light sensor. When it is determined that it is necessary to enter the anti-glare state, the control unit applies a voltage to the liquid crystal dimming layer, and the mirror reflectivity drops to the lowest, and the reflectivity is lower than 10%. The working principle is as follows: As Figure 8As shown in the figure, a represents external natural light. Light a can be decomposed into two mutually perpendicular polarized lights b and c. Among them, b represents the polarized light perpendicular to the absorption axis of the absorption-type polarizing layer 11, and c represents the polarized light parallel to the absorption axis of the absorption-type polarizing layer 11. Specifically, when unpolarized ambient light a is incident on the absorption-type polarizing layer 11, the light c parallel to the absorption axis of the absorption-type polarizing layer 11 is absorbed, and the light b perpendicular to the absorption axis of the absorption-type polarizing layer 11 can pass through and attenuate to b1. When b1 is incident on the liquid crystal dimming layer 12, b1 can pass through the liquid crystal dimming layer 12 and attenuate to b2. When b2 is incident on the reflective polarizing layer 13, the reflection axis of the reflective polarizing layer 13 is perpendicular to the polarization direction of b2. B2 passes through the reflective polarizing layer 13 and attenuates to b3. If each layer is an ideal dielectric material, the attenuation of light will tend to zero. It can be seen that at this time, the reflectivity of the external reflected light source reaches the lowest, and the reflectivity is within 10%. At this time, the frameless anti-glare rearview mirror enters the anti-glare state with the lowest reflection.

[0051] Figure 9 is a schematic optical path diagram of the frameless anti-glare rearview mirror in the mirror state with the highest reflectivity and the lowest transmittance in a specific embodiment of the present invention. As Figure 9 shown in the figure, when the display module is turned off, the control unit determines whether to enter the anti-glare state according to the signals sent by the front light sensor and the rear light sensor. When it is determined that there is no need to enter the anti-glare state, the control unit does not apply a voltage to the liquid crystal dimming layer, and the mirror reflectivity maintains the highest state, with a reflectivity greater than 40%. The working principle is as follows: a represents external natural light. Light a can be decomposed into two mutually perpendicular polarized lights b and c. Among them, b represents the polarized light perpendicular to the absorption axis of the absorption-type polarizing layer 11, and c represents the polarized light parallel to the absorption axis of the absorption-type polarizing layer 11. Specifically, when unpolarized ambient light a is incident on the absorption-type polarizing layer 11, the light c parallel to the absorption axis of the absorption-type polarizing layer 11 is absorbed, and the light b perpendicular to the absorption axis of the absorption-type polarizing layer 11 can pass through and attenuate to b1. When b1 is incident on the liquid crystal dimming layer 12, the liquid crystal dimming layer 12 rotates the polarization direction of b1 by 90 degrees and attenuates it to c1. When c1 is incident on the reflective polarizing layer 13, the reflection axis of the reflective polarizing layer 13 is parallel to the polarization direction of c1, and c1 is reflected back to the liquid crystal dimming layer 12 by the reflective polarizing layer 13. When c1 is incident on the liquid crystal dimming layer 12, the liquid crystal dimming layer 12 rotates the polarization direction of c1 by 90 degrees and attenuates it to b2. When b2 is incident on the absorption-type polarizing layer 11, b2 can pass through the absorption-type polarizing layer 11 and attenuate to b3. If each layer is an ideal dielectric material, the attenuation of light will tend to zero. It can be seen that at this time, the reflectivity of the external reflected light source reaches the highest, and the reflectivity is greater than 40%. At this time, the rearview mirror presents the mirror state with the highest reflection.

[0052] On the other hand, the present invention also provides a method for manufacturing a frameless anti-glare rearview mirror, including the steps of:

[0053] a. Provide a liquid crystal dimming layer, which includes a first transparent substrate, a first transparent electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a second transparent electrode, and a second transparent substrate arranged in sequence. The first transparent substrate is adjacent to the absorptive polarizer layer, and the first transparent substrate and the second transparent substrate are vertically corresponding in position. A stepped portion whose position exceeds the second transparent substrate is provided at the edge of the first transparent substrate;

[0054] b. Form electrode connection lines that are electrically connected to the first transparent electrode and the second transparent electrode in the liquid crystal dimming layer respectively. The bonding device grabs the outer region of the electrode connection lines for alignment, and then thermally presses the inner region of the electrode connection lines, so that the inner region of the electrode connection lines is located on the stepped portion and fixed on the side of the first transparent substrate facing the second transparent substrate. In the present invention, the electrode connection lines are, for example, FPC boards. The first transparent electrode is directly electrically connected to the electrode connection lines, and the second transparent electrode is electrically connected to the electrode connection lines through a conductive object (such as a conductive gold ball) provided between the first transparent substrate and the second transparent substrate;

[0055] c. Then cut and remove the outer region of the electrode connection lines. Specifically, the dedicated device grabs the positioning region of the electrode connection lines for alignment before bonding. After the alignment is completed, the device head applies a certain pressure and temperature conditions to the area to be fixed of the electrode connection lines, and after maintaining for a certain time, the bonding process is completed. In the present invention, in order to meet the design requirements of a borderless structure, the positioning area is cut off after the bonding is completed;

[0056] d. Provide an absorptive polarizer layer, form an ink layer on one side of the absorptive polarizer layer, and then attach the side of the absorptive polarizer layer facing away from the ink layer to the liquid crystal dimming layer, or first attach the absorptive polarizer layer to the liquid crystal dimming layer, and then form an ink layer on the side of the absorptive polarizer layer facing away from the liquid crystal dimming layer;

[0057] e. Attach a reflective polarizer layer to the other side of the liquid crystal dimming layer.

[0058] In the present invention, the absorption axis polarization direction of the absorptive polarizer layer and the reflection axis polarization direction of the reflective polarizer are parallel or perpendicular to each other. The absorption axis polarization direction of the absorptive polarizer layer and the reflection axis polarization direction of the reflective polarizer are parallel or perpendicular to each other according to the different liquid crystal materials selected for the liquid crystal dimming layer. For example, if the TN type liquid crystal material is selected in the liquid crystal dimming layer, the absorption axis polarization direction of the absorptive polarizer layer and the reflection axis polarization direction of the reflective polarizer are parallel to each other. If the VA type liquid crystal material is selected in the liquid crystal dimming layer, the absorption axis polarization direction of the absorptive polarizer layer and the reflection axis polarization direction of the reflective polarizer are perpendicular to each other, which will not be elaborated here.

[0059] The frameless anti-glare rearview mirror of the present invention has no ghosting, fast anti-glare speed, and high mirror utilization efficiency; the manufacturing method of the frameless anti-glare rearview mirror of the present invention is simple and has low production cost. The frameless anti-glare rearview mirror of the present invention adopts a frameless design, which greatly increases the effective use area of ​​the mirror surface, and has an automatic anti-glare function. Compared with the electrochromic anti-glare rearview mirror, the anti-glare speed of the present invention reaches within tens of milliseconds, and the anti-glare speed is fast. In addition, compared with the traditional streaming media rearview mirror, the ghosting problem is solved. The mirror surface of the traditional streaming media rearview mirror is made of semi-transparent and semi-reflective glass, and the reflectivity of the glass is greater than 40% and cannot be adjusted. When observing the rear road condition information through the display module, the existence of reflection will cause the ghosting phenomenon of the reflected image and the displayed image interfering with each other; the present invention adopts liquid crystal dimming technology. When observing the rear road condition information through the display screen, the reflectivity of the mirror surface will automatically decrease to less than 10%, greatly reducing the brightness of the reflected image, thereby solving the ghosting problem. In addition, the frameless anti-glare rearview mirror of the present invention also has the advantage of high brightness. The transmittance of a traditional streaming media rearview mirror is usually less than 60%, resulting in a problem of low display brightness, while the transmittance of the frameless anti-glare rearview mirror of the present invention is automatically adjusted to more than 70%, thereby improving the light source utilization rate of the display screen, thereby improving the display brightness, while reducing heat generation, reducing costs, and being safer and more reliable. The frameless anti-glare rearview mirror of the present invention adopts a special bracket for a special car or adopts a method of installing a back hook and a strap, which is easy to replace and install, and can be applied to the installation of special brackets for special cars of various models, and can also save the disassembly process of the original mirror.

[0060] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A frameless anti-glare rearview mirror, It is characterized in that The frameless anti-glare rearview mirror comprises an absorption-type polarizing layer, a liquid crystal dimming layer and a reflection-type polarizing layer which are sequentially arranged from the observer side, the liquid crystal dimming layer comprises a first transparent substrate, a first transparent electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a second transparent electrode and a second transparent substrate which are sequentially arranged, the first transparent substrate is adjacent to the absorption-type polarizing layer, the first transparent substrate and the second transparent substrate correspond in position up and down, the first transparent substrate has a step portion at the edge thereof which exceeds the position of the second transparent substrate, the frameless anti-glare rearview mirror further comprises an electrode connecting line which is electrically connected to the first transparent electrode and the second transparent electrode respectively, the electrode connecting line is located at the step portion and fixed to the side of the first transparent substrate facing the second transparent substrate; The electrode connection line includes: a gold finger area and a PAD area, the gold finger area includes a first gold finger area and a second gold finger area, the first gold finger area is electrically connected to the first transparent electrode, and the second gold finger area is electrically connected to the second transparent electrode, the PAD area includes a first PAD area and a second PAD area, the first PAD area is electrically connected to the first gold finger area, and the second PAD area is electrically connected to the second gold finger area.

2. The frameless anti-glare rearview mirror according to claim 1, It is characterized in that It also includes an ink layer located on a side of the absorption-type polarizing layer away from the first transparent substrate.

3. The frameless anti-glare rearview mirror according to claim 1, It is characterized in that The electrode connection line includes an inner area, and the gold finger area and the PAD area are arranged in the inner area.

4. The frameless anti-glare rearview mirror according to claim 3, It is characterized in that The electrode connection line further includes an outer region connected to the inner region.

5. The frameless anti-glare rearview mirror according to claim 1, It is characterized in that The ink in the ink layer is mirror silver ink or metallic ink, and the width of the ink layer is in the range of 1.0 mm to 10 mm.

6. The frameless anti-glare rearview mirror according to claim 1, It is characterized in that The electrode connecting wire is an FPC board.

7. The frameless anti-glare rearview mirror according to claim 1, It is characterized in that The frameless anti-glare rearview mirror also includes at least one light sensor and a control unit. The light sensor detects changes in ambient light and feeds back information to the control unit. The control unit electronically adjusts the voltage applied to the liquid crystal layer based on the information.

8. The frameless anti-glare rearview mirror according to claim 1, It is characterized in that The frameless anti-glare rearview mirror also includes a display module located on a side of the reflective polarizing layer away from the liquid crystal dimming layer.

9. The frameless anti-glare rearview mirror according to claim 7, It is characterized in that The frameless anti-glare rearview mirror further includes a front camera module, a front camera patch cord, a rear camera module, and a rear camera patch cord. The front camera module is connected to the control unit through the front camera patch cord, and the rear camera module is connected to the control unit through the rear camera patch cord.

10. The frameless anti-glare rearview mirror according to claim 1, wherein, the frameless anti-glare rearview mirror further includes a back hook and a strap located on the back of the observer.

11. The frameless anti-glare rearview mirror according to claim 1, wherein, the frameless anti-glare rearview mirror further includes a speaker and a microphone, which are respectively used for emitting and receiving sound signals.

12. A method for manufacturing the frameless anti-glare rearview mirror according to any one of claims 1 to 11, wherein, it includes the steps of: a. Providing a liquid crystal dimming layer, which includes a first transparent substrate, a first transparent electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a second transparent electrode, and a second transparent substrate arranged in sequence. The first transparent substrate is adjacent to the absorptive polarizer layer, the first transparent substrate and the second transparent substrate are vertically corresponding in position, and a stepped portion whose position exceeds the second transparent substrate is provided at the edge of the first transparent substrate; b. Forming electrode connection lines electrically connected to the first transparent electrode and the second transparent electrode in the liquid crystal dimming layer respectively. The binding device grabs the outer region of the electrode connection lines for alignment, and then thermally presses the inner region of the electrode connection lines, so that the inner region of the electrode connection lines is located on the stepped portion and fixed on the side of the first transparent substrate facing the second transparent substrate; c. Then cutting and removing the outer region of the electrode connection lines; d. Providing an absorptive polarizer layer, forming an ink layer on one side of the absorptive polarizer layer, and then attaching the side of the absorptive polarizer layer facing away from the ink layer to the liquid crystal dimming layer, or first attaching the absorptive polarizer layer to the liquid crystal dimming layer, and then forming an ink layer on the side of the absorptive polarizer layer facing away from the liquid crystal dimming layer; e. Attaching a reflective polarizer layer to the other side of the liquid crystal dimming layer.

13. The method for manufacturing the frameless anti-glare rearview mirror according to claim 12, wherein, the absorption axis polarization direction of the absorptive polarizer layer is parallel or perpendicular to the reflection axis polarization direction of the reflective polarizer.

14. The method for manufacturing the frameless anti-glare rearview mirror according to claim 12, wherein, a cut line is provided at the connection between the outer region and the inner region, which is convenient for subsequent cutting and removing the outer region. The cut line is flush with the edge of the first transparent substrate or located inside the edge of the first transparent substrate.

15. The method for manufacturing the frameless anti-glare rearview mirror according to claim 12, wherein, in step b, the first transparent electrode is directly electrically connected to the electrode connection line, and the second transparent electrode is electrically connected to the electrode connection line through a conductive object arranged between the first transparent substrate and the second transparent substrate.

16. The manufacturing method of the frameless anti-glare rearview mirror according to claim 15, characterized in that, the conductive object is a conductive gold ball.

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