CN214335416U

CN214335416U - Liquid crystal light modulation device

Info

Publication number: CN214335416U
Application number: CN202120562243.XU
Authority: CN
Inventors: 王秋生; 吴梓荣
Original assignee: Shenzhen AV Display Co Ltd
Current assignee: Shenzhen AV Display Co Ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-10-01
Anticipated expiration: 2031-03-18

Abstract

The utility model relates to a photoelectric field especially relates to a liquid crystal light-adjusting device, mainly includes front shroud, first polarisation layer, first conducting layer, first vertical orientation layer, vertical orientation liquid crystal layer, second vertical orientation layer, second conducting layer and the second polarisation layer that from the top down set gradually, second polarisation layer is semi-transparent semi-reverse polarisation layer, first conducting layer and the electrically conductive layer connection power of second, the front shroud is provided with printing opacity district and non-printing opacity district. The utility model discloses utilize the liquid crystal dimming technique, through the arrangement of electric field control liquid crystal to change the polarization direction of light, cooperate the optical axis direction on polarisation layer, reach control light transmission, reflection and absorption three kinds of states, the photoelectric efficiency is high, and the photoelectric efficiency is high, surpasss current coating film or the fixed half reflection half mirror effect of pad pasting formula; on the other hand, the front cover plate is provided with a light-transmitting area and a non-light-transmitting area, and the appearance of the product is designed to be attractive without a frame by utilizing the principle that the surface color of the non-light-transmitting area is similar to that of the liquid crystal dimming device.

Description

Liquid crystal light modulation device

Technical Field

The utility model belongs to the technical field of the photoelectricity, especially, relate to a liquid crystal light modulation device.

Background

Besides being used for display, with the rise of intelligent technologies, liquid crystal technologies have started to be applied in a large number of non-display fields, such as intelligent dimming rearview mirrors, liquid crystal dimming sunvisors, automatic dimming curtains for automobiles, and the like. The existing dimming device has the problems of low dimming efficiency, inconsistent colors of an appearance frame region and a middle region, poor attractiveness and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is:

in order to solve the technical problem, the utility model discloses a technical scheme be:

the utility model provides a liquid crystal light modulation device, including first polarisation layer, first conducting layer, first alignment layer, liquid crystal layer, second alignment layer, second conducting layer and the second polarisation layer that from the top down set gradually, the second polarisation layer is semi-transparent semi-reflection polarisation layer, first conducting layer and second conducting layer connecting power supply, liquid crystal light modulation device still includes a front shroud, the front shroud set up in the top on first polarisation layer.

Preferably, the front cover plate includes a light-transmitting region and a non-light-transmitting region, and the non-light-transmitting region is disposed at an edge region near one side of the first polarizer.

Preferably, the non-light-transmitting area is a silk screen or an opaque light-blocking layer attached to the surface of the front cover plate.

Preferably, the opaque light blocking layer is similar to the surface color of the liquid crystal dimming device.

Preferably, the first polarizing layer is an absorption type polarizing layer, absorbs light having a polarization direction parallel to a light absorption axis direction thereof, and allows light having a polarization direction perpendicular to the light absorption axis direction thereof to transmit therethrough.

Preferably, the second polarizing layer is a transflective polarizing layer that reflects light having a polarization direction parallel to a reflection axis direction thereof and allows light having a polarization direction perpendicular to the reflection axis direction thereof to pass therethrough.

Preferably, the front cover plate is transparent glass or transparent plastic plate, and the first conductive layer and the second conductive layer are made of transparent conductive materials.

Preferably, the first alignment layer and the second alignment layer are vertical alignment layers or parallel alignment layers.

The beneficial effects of the utility model reside in that: the utility model utilizes the liquid crystal dimming technology, controls the liquid crystal deflection through the electric field adjustment, thereby changing the polarization direction of light, matching with the optical axis direction of the polarizing layer, achieving three states of controlling light transmission, reflection and absorption, and having high photoelectric efficiency; on the other hand, the front cover plate is provided with a light-transmitting area and a non-light-transmitting area, and the appearance of the product is designed to be attractive without a frame by utilizing the principle that the surface color of the non-light-transmitting area is similar to that of the liquid crystal dimming device.

The utility model is suitable for various dimming scenes, such as an intelligent dimming rearview mirror, a liquid crystal dimming sun shield, an automatic dimming curtain of an automobile and the like, for example, a display screen is superposed on the back of the utility model, when the utility model is light-proof, the utility model is a mirror or a black background, and has the effect of being integrated with a display screen shell; when the utility model discloses the during operation is transparent state, the utility model discloses the display screen's at the back display screen display frame can clearly see through.

Drawings

The following detailed description of the specific structure of the present invention with reference to the accompanying drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic diagram of the light reflection state light path of the present invention;

fig. 3 is a schematic view of the light path in the light transmission state of the present invention;

FIG. 4 is a graph of reflectance and polarized light transmittance;

in the figure: 1. a front cover plate; 2. a first polarizing layer; 3. a first conductive layer; 4. a first vertical alignment layer; 5. a vertically aligned liquid crystal layer; 51. liquid crystal molecules; 6. a second vertical alignment layer; 7. a second conductive layer; 8. a second polarizing layer.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The invention will be further described with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1, the liquid crystal light modulator device, including front shroud 1, first polarisation layer 2, first conducting layer 3, first alignment layer 4, liquid crystal layer 5, second alignment layer 6, second conducting layer 7 and the second polarisation layer 8 that from the top down set gradually, front shroud 1 middle zone is the light transmission region, the fringe zone is light tight region, first polarisation layer 2 is absorption type polarisation layer, second polarisation layer 8 is semi-transparent semi-reflection polarisation layer, first conducting layer 3 and second conducting layer 7 connect the power, first alignment layer 4 and second alignment layer 6 are vertical alignment layer or parallel alignment layer.

The electric field is formed by inputting power to the first conductive layer 3 and the second conductive layer 7, the arrangement mode of the liquid crystal molecules 51 of the liquid crystal layer 5 is changed by controlling the size of the electric field, and the transmission and reflection of light are controlled by matching the optical axis directions of the first polarizing layer 2 and the second polarizing layer 8. The first conductive layer 3 and the second conductive layer 7 are both made of transparent conductive materials, so that the optical efficiency can be best achieved.

The liquid crystal dimming device will be described below with reference to fig. 2 and 3 as an example. The angle between the absorption axis direction of the first polarizing layer 2 and the reflection axis direction of the second polarizing layer 8 is set to 0 °, the angle between the orientation direction of the first alignment layer 4 and the absorption axis direction of the first polarizing layer 2 is set to 90 °, the angle between the orientation direction of the second alignment layer 6 and the absorption axis direction of the second polarizing layer 8 is set to 0 °, when the first conductive layer 3 and the second conductive layer 7 are not energized, there is zero electric field between the first conductive layer 3 and the second conductive layer 7, as shown in the optical reflection state optical path diagram of fig. 2, the liquid crystal molecules 51 of the liquid crystal layer 5 are arranged by 90 ° twist, when natural light is incident on the first polarizing layer 2, only polarized light perpendicular to the absorption axis direction of the first polarizing layer 2 is transmitted, the transmitted polarized light is in the same direction as the first alignment layer 4, and reaches the second alignment layer 6 by 90 ° along the arrangement of the liquid crystal layer 5, at this time, the polarization direction of the polarized light is the same as the reflection axis direction of the second polarizing layer 8, the polarized light will be totally reflected at this time, and the reflected polarized light will reach the first polarizing layer 2 by being twisted by 90 ° again through the liquid crystal, and the polarized light will be passed through in the direction perpendicular to the light absorption axis direction of the first polarizing layer 2. At this time, when viewed from the first polarizing layer 2, the liquid crystal dimming device is in a light-shielding and reflective state, an object or an image behind the second polarizing layer 8 is shielded, and light incident to the liquid crystal dimming device is reflected, and at this time, the reflectivity of the liquid crystal dimming device can reach 42% or more.

When the first conductive layer 3 and the second conductive layer 7 are electrified, an electric field is formed between the first conductive layer 3 and the second conductive layer 7, as shown in a light transmission state light path schematic diagram of fig. 3, liquid crystal molecules 51 of the liquid crystal layer 5 are vertically arranged without rotating light, when external natural light enters the second polarizing layer 8, the polarization direction of the emergent polarized light in the liquid crystal layer 5 is not changed, when the polarized light reaches the first polarizing layer 2, the polarization direction is parallel to the light transmission axis direction of the first polarizing layer 2, and the emergent polarized light can be transmitted through the first polarizing layer 2 without being absorbed, at this time, the liquid crystal dimming device is in a transmission state, an object or an image behind the second polarizing layer 8 is displayed, at this time, the light transmittance of the liquid crystal dimming device to the polarization can reach more than 85%, and the requirements of a user on brightness and contrast are met; see fig. 4 for the change of reflectivity and polarized light transmittance at different voltages.

Front shroud 1, for transparent glass or transparent plastic board, arranges first polaroid 2's top in, including light transmission region and non-light transmission region, non-light transmission region sets up in the marginal area that is close to 2 one sides of first polaroid, for silk screen printing or attached in the opaque layer that is in the light on front shroud surface, the opaque layer colour that is in the light is close with liquid crystal dimming device surface colour, is used for sheltering from the colour of liquid crystal dimming device frame makes the display area of liquid crystal dimming device and the silk screen printing region of front shroud 1 link as an organic wholely, realize the aesthetic design that product appearance does not have the frame.

For a clearer explanation of the present embodiment, the following test data will be attached:

the parameters of the liquid crystal dimming device are as follows:

the test data of each index of the liquid crystal dimming device are as follows:

item	Test data	Remarks for note
			Non-electric-transmission rate	0.9％
Non-energized-reflectance	42.2％
			Electric current-transmittance	85.4％	Transmittance of polarized light
Electric current-reflectance ratio	7.7％
			Response time Tr + Tf	200ms

The color coordinate test data is as follows:

referring to fig. 4, the reflectivity and the parallel light transmittance change under different voltages, the reflectivity reaches over 40% in the unpowered state, and the transmittance is less than 1%, so that the shading and reflecting requirements of the product are met. Under the on-state, when the incident light is the polarized light, and the optical axis direction is unanimous with the polarization optical axis on first polarisation layer or second polarisation layer, the transmissivity of this polarized light will reach more than 85% this moment, surpasss current coating film or the fixed half mirror effect of semi-transparent of pad pasting formula, has promoted customer's experience degree. The color difference between the cover plate area and the display area after the cover plate is added is less than 1, the ground color is basically consistent, and the appearance is frameless and attractive in the mirror surface state.

Various other changes and modifications may be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should fall within the scope of the claims of the present invention.

Claims

1. The utility model provides a liquid crystal dimming device, includes first polarisation layer, first conducting layer, first alignment layer, liquid crystal layer, second alignment layer, second conducting layer and the second polarisation layer that from the top down set gradually, the second polarisation layer is half-transparent half reverse polarisation layer, first conducting layer and second conducting layer connection power supply, its characterized in that: the liquid crystal dimming device further comprises a front cover plate, and the front cover plate is arranged above the first polarizing layer.

2. The liquid crystal dimming device of claim 1, wherein: the front cover plate comprises a light-transmitting area and a non-light-transmitting area, and the non-light-transmitting area is arranged in the edge area close to one side of the first polarizer.

3. A liquid crystal dimming device according to claim 2, wherein: the non-light-transmitting area is an opaque light blocking layer printed in a silk screen or attached to the surface of the front cover plate.

4. A liquid crystal dimming device according to claim 3, wherein: the opaque light blocking layer is similar to the surface color of the liquid crystal dimming device.

5. The liquid crystal dimming device of claim 1, wherein: the first polarizing layer is an absorption type polarizing layer, absorbs light with a polarization direction parallel to the light absorption axis direction of the first polarizing layer, and allows light with the polarization direction perpendicular to the light absorption axis direction of the first polarizing layer to transmit.

6. The liquid crystal dimming device of claim 1, wherein: the second polarizing layer is a semi-transparent semi-reflective polarizing layer, reflects light with a polarization direction parallel to a reflection axis direction thereof, and allows light with a polarization direction perpendicular to the reflection axis direction thereof to transmit therethrough.

7. The liquid crystal dimming device of claim 1, wherein: the front cover plate is made of transparent glass or transparent plastic plate, and the first conducting layer and the second conducting layer are made of transparent conducting materials.

8. The liquid crystal dimming device of claim 1, wherein: the first alignment layer and the second alignment layer are vertical alignment layers or parallel alignment layers.