CN221631806U

CN221631806U - Low-driving-voltage high-contrast dimming device and dimming glass

Info

Publication number: CN221631806U
Application number: CN202322619410.1U
Authority: CN
Inventors: 陈焙才; 李民
Original assignee: Shanghai HIUV Applied Materials Technology Co Ltd; Shanghai HIUV New Materials Co Ltd
Current assignee: Shanghai HIUV Applied Materials Technology Co Ltd; Shanghai HIUV New Materials Co Ltd
Priority date: 2023-09-26
Filing date: 2023-09-26
Publication date: 2024-08-30
Anticipated expiration: 2033-09-26

Abstract

The utility model discloses a low-driving-voltage high-contrast dimming device and dimming glass, which are formed by combining polymer disperse dye liquid crystal and electrochromic units, wherein the connection of the polymer disperse dye liquid crystal and the electrochromic units adopts double-sided conductive substrates; in the technical scheme, the polymer dye dispersed liquid crystal layer with smaller thickness and the electrochromic layer are used for jointly realizing the dimming function, so that the working voltage of the polymer dye dispersed liquid crystal unit is reduced under the condition of obtaining high contrast, and the off-state shielding property of a dimming device under the condition of low voltage is improved; the double-sided conductive substrate is adopted to separate and connect the independent dimming units, so that the adhesive film layer and the substrate layer used for directly bonding a plurality of dimming units are reduced, the structure of the dimming device is simpler, and the reliability is higher.

Description

Low-driving-voltage high-contrast dimming device and dimming glass

Technical Field

The utility model relates to the dimming field, in particular to a low-driving-voltage high-contrast dimming device.

Background

PDLC dimming films or EC dimming films are commonly used in architectural or vehicle glass.

When no electric field is applied to the PDLC dimming film, the film is in a strong light scattering state and is opaque because the refractive index difference of light passing through liquid crystal microdroplets and polymers is large; when the applied electric field acts, the orientation of the liquid crystal microdroplet director is the same as that of the electric field, the long axis refractive index of the liquid crystal is matched with that of the polymer, and the transparent state of the film can be changed between the transparent state and the non-transparent state by electrifying and de-electrifying, so that the liquid crystal microdroplet director has the privacy guarantee function and can be used as a projection screen.

The electrochromic dimming film is respectively arranged between two layers of substrates: a first transparent conductive layer, an electrochromic layer, an electrolyte layer, an ion storage layer, and a second transparent conductive layer. The working principle is that external voltage is applied to electrodes at two ends of an electrochromic dimming film, ions migrate into (or out of) an electrochromic layer under the action of an electric field of the external voltage, so that the valence number of an electrochromic material is reduced (or increased), and the electrochromic material changes in color before reaching balance; after equilibrium is reached, the color change of the electrochromic material stabilizes.

The existing PDLC dimming film only has two states of on-state light transmission and off-state light-tight, the privacy function is realized, the shielding effect of the PDLC dimming film is related to the thickness of a polymer disperse dye liquid crystal layer, the larger the thickness of the liquid crystal layer is, the better the shielding effect is, the working voltage is increased along with the increase of the thickness, the problem that the shielding effect is poor or the on-state haze is high exists under the low working voltage, and the PDLC dimming film does not have the light transmittance adjusting function. The electrochromic dimming film can adjust the light transmittance, but has the problem of low color change speed of the dimming film under the condition of high contrast. Both of the above dimming films cannot have high contrast and good shielding performance under low operating voltage conditions.

Disclosure of utility model

In order to solve the problem that the dimming film cannot have high contrast and good shielding performance under the condition of low working voltage, the utility model provides the following technical scheme:

a low-driving-voltage high-contrast dimming device is composed of a first transparent conductive substrate, a dimming layer, a second transparent conductive substrate, an electrolyte layer and a third transparent conductive substrate which are sequentially and tightly connected, wherein:

The first transparent conductive substrate consists of a first base material layer and a first conductive layer, and the first conductive layer is tightly connected with the dimming layer; the dimming layer comprises at least one polymer disperse dye liquid crystal layer; the second transparent conductive substrate consists of a third conductive layer, a second base material layer, a fourth conductive layer and an ion storage layer in sequence, wherein the third conductive layer is tightly connected with the dimming layer; two sides of the electrolyte layer are respectively and tightly connected with the ion storage layer and the third transparent conductive substrate layer; the third transparent conductive substrate is composed of an electrochromic layer, a fifth conductive layer and a third substrate layer in sequence, wherein the electrochromic layer is tightly connected with the electrolyte layer.

Preferably, the low driving voltage high contrast dimming device has a switching state contrast ratio of 15 or more.

Preferably, the dimming operation voltage of the polymer disperse dye liquid crystal layer is less than or equal to 36V.

Preferably, the dimming working voltage of the electrochromic layer is less than or equal to 3V, the voltage is adjustable in the electrified state, and the contrast of the electrochromic layer correspondingly changes.

Preferably, the polymer disperse dye liquid crystal layer has an on-state light transmittance of not more than 80%.

Preferably, the polymer disperse dye liquid crystal layer has a thickness of not more than 25 micrometers and a switching state contrast ratio of not less than 2.

Preferably, the thickness of the polymer disperse dye liquid crystal layer is not more than 15 microns, and the on-off contrast ratio is not less than 2.

Preferably, the electrochromic layer has a switch state contrast of not less than 2.

Preferably, the dimming layer comprises at least two of said polymer dispersed dye liquid crystal layers.

Preferably, a transparent spacer conductive layer is disposed between at least two of the polymer disperse dye liquid crystal layers.

Preferably, the transparent spacer conductive layer is composed of a first spacer conductive layer, a second spacer conductive layer, and a transparent spacer substrate layer sandwiched between the first spacer conductive layer and the second spacer conductive layer.

Preferably, more than two polymer disperse dye liquid crystal layers are electrically connected in parallel or in an independent control mode; the electrochromic layers are electrically connected in an independent control mode.

On the other hand, the application provides a low-driving-voltage high-contrast dimming device, which is formed by sequentially and tightly connecting a first transparent conductive substrate, a dimming layer, a second transparent conductive substrate, an electrolyte layer and a third transparent conductive substrate, wherein: the first transparent conductive substrate consists of a first base material layer and a first conductive layer, and the first conductive layer is tightly connected with the dimming layer; the dimming layer comprises at least one polymer disperse dye liquid crystal layer; the second transparent conductive substrate consists of a third conductive layer, a second base material layer, a fourth conductive layer and an electrochromic layer in sequence, wherein the third conductive layer is tightly connected with the dimming layer; two sides of the electrolyte layer are respectively and tightly connected with the electrochromic layer and the third transparent conductive substrate layer; the third transparent conductive substrate is composed of an ion storage layer, a fifth conductive layer and a third substrate layer in sequence, wherein the ion storage layer is tightly connected with the electrolyte layer.

On the other hand, the application provides low-driving-voltage high-contrast dimming glass which comprises a low-driving-voltage high-contrast dimming device, wherein two sides of the dimming device are respectively provided with a glue film layer and a glass layer in sequence.

In summary, the present application includes at least one of the following beneficial technical effects:

(1) In the technical scheme, the dimming function is realized by using the polymer dye dispersed liquid crystal layer with smaller thickness and the electrochromic layer together, and the polymer dye dispersed liquid crystal layer contains the dichromatic dye and can adjust the full light transmittance of the dimming unit under different conditions of a switching state; under the on-state condition, the smaller thickness of the polymer dye disperse liquid crystal layer enables the polymer dye disperse liquid crystal layer to have lower on-state haze under the low-voltage condition, the polymer disperse dye units and the electrochromic units can be used for adjusting the light transmittance, the overall contrast ratio of the dimming device is theoretically the product of the contrast ratio of each dimming unit, and the dimming device obtains the contrast ratio which is larger than 15 times under the low-voltage condition.

(2) The dimming device in the technical scheme has a contrast ratio of more than 15 times, and can improve the off-state shielding performance of the dimming device under the low-voltage condition.

(3) And the substrate or substrate layers with two conductive layers and other functional layers are adopted between the dimming layers and the ion storage layers (electrochromic layers) and between the polymer disperse dye liquid crystal layers for separation, so that the adhesive film layers and substrate layers used for directly bonding a plurality of dimming devices are reduced, the structure of the dimming devices is simpler, and the reliability is higher.

Drawings

Fig. 1-2 are schematic structural diagrams of a low-drive voltage high-contrast dimming device as described in the implementations.

Reference numerals illustrate:

10. A first transparent conductive substrate; 11. a first substrate layer; 12. a first conductive layer; 20. a dimming layer; 21. a polymer disperse dye liquid crystal layer; 221. a first spaced conductive layer; 222. a transparent spacer substrate layer; 223. a second spaced conductive layer; 23. a polymer disperse dye liquid crystal layer; 30. a second transparent conductive substrate; 311. a third conductive layer; 312. a fourth conductive layer; 32. a second substrate layer; 33. an ion storage layer; 40. an electrolyte layer; 50. a third transparent conductive substrate layer; 51. an electrochromic layer; 52. a fifth conductive layer; 53. and a third substrate layer.

Detailed Description

The application is described in further detail below with reference to the drawings and detailed description. In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments.

The term "on state" referred to in this document refers to an energized state; the "off state" refers to the unpowered state.

The terms "plenoptic" and "plenoptic" as referred to herein refer to test light source light having a wavelength in the range of 380-780 nm.

The term "contrast ratio" referred to in the present document refers to the ratio of the light transmittance of the switching state of the light modulation film at the operating voltage, and for convenience of comparison, the operating voltage of the polymer disperse dye liquid crystal layer in the embodiment of the present application is set to 36 volts, and the operating voltage of the electrochromic layer is set to 3 volts.

In some embodiments, the conductive layer closely connecting the substrates or substrate layers needs to have high visible light transmittance, and is selected from one or more transparent conductive oxides such as nano silver conductive layer, nano zinc aluminum oxide (AZO), indium Tin Oxide (ITO), zinc oxide (ZnO), aluminum gallium indium tin oxide (AlGaInSnO), aluminum Zinc Oxide (AZO), tin oxide (SnO 2), indium oxide (In 2O 3), zinc tin oxide (SnZnO), and the like.

In one embodiment, the conductive layer that is in intimate contact with each substrate or substrate layer further includes functional layers such as one or more of a silicon dioxide layer, a silicon nitride layer, a vanadium oxide, a titanium oxide, a metallic silver layer.

In some embodiments, the dye used in the polymeric disperse dye liquid crystal layer is one or more of dichroic dyes.

In some embodiments, the transparent substrate layer is a transparent single layer or multilayer structure selected from one or more of a PET layer, a PC layer.

In some embodiments, the ion storage layer is ferrocene, prussian blue, tungsten trioxide, or titanium dioxide.

In some embodiments, the electrolyte layer includes liquid, inorganic solid, and polymer electrolytes.

In some embodiments, the electrochromic layer includes an organic electrochromic material, an inorganic electrochromic material, and a composite electrochromic material.

In some application examples, two adhesive film layers and a glass layer are respectively arranged on the outer side of the light adjusting device, the adhesive film layers are used for bonding the light adjusting device and the glass layer, and the adhesive film layers can be made of PVB, EVA, POE, PU and other transparent materials.

In some embodiments, the full light transmittance and haze of individual polymer disperse dye liquid crystal devices, electrochromic devices, and integral dimming devices described in the examples, respectively, were tested.

Optical properties: the method is carried out according to the method specified in GB/T2410-2008 'determination of light transmittance and haze of transparent plastics'.

When in test, 36V alternating voltage is used for independently controlling the dimming layers in the polymer disperse dye liquid crystal device or the integral dimming device, and the two polymer disperse dye liquid crystal layers are controlled in parallel; the single polymer disperse dye liquid crystal device comprises a polymer disperse dye liquid crystal layer and two identical first transparent conductive substrates symmetrically arranged on two sides of the polymer disperse dye liquid crystal layer.

The electrochromic layers in the electrochromic device or the overall dimmer device were individually controlled using a 3 volt dc voltage at the time of testing. The individual electrochromic dimming device includes a second transparent substrate without a third conductive layer, an ion storage layer, and a third transparent substrate.

The total light transmittance and haze of the entire dimmer device were tested under the conditions that each dimmer device was on or off in synchronization.

The contrast ratio calculating method comprises the following steps: contrast cr=on-state full light transmittance/off-state full light transmittance.

In this embodiment, only the case where the light adjusting layer contains two polymer dye dispersed liquid crystal layers is exemplified, and the case where the number of polymer dye dispersed liquid crystal layers is greater than two can be exemplified according to this embodiment.

Example 1

As shown in fig. 1, the light modulation device in this embodiment is shown in fig. 1, the first transparent conductive substrate (10) is a PET (11) conductive film with an ITO conductive layer (12) having a thickness of 188 micrometers, and a side of the ITO conductive layer (12) facing away from the PET (11) is tightly connected with the light modulation layer (20); the dimming layer (20) is a polymer disperse dye liquid crystal layer (21) with a thickness of 15 micrometers; one side of the dimming layer (20) facing away from the ITO conductive layer (12) is tightly connected with a third conductive ITO layer (311) in the second transparent conductive substrate (30); the second transparent conductive substrate (30) is composed of a third conductive ITO layer (311), a 188-micrometer second substrate layer PET (32), a fourth conductive ITO layer (312) and an ion storage layer (33) in sequence; one side of the ion storage layer (33) back to the fourth conductive ITO layer (312) is tightly connected with the electrolyte layer (40), and one side of the electrolyte layer (40) back to the fourth conductive ITO layer (312) is tightly connected with the electrochromic layer (51), the fifth conductive ITO layer (52) and the 188-micrometer third substrate layer PET (53) in sequence.

Examples 2 to 3

Examples 2 to 3 differ from example 1 in that the polymer dispersed dye liquid crystal layer (21) and the electrochromic layer differ in on-state transmittance, haze. Wherein the ITO conductive layer (12) in example 2 comprises a metallic silver layer, and the ITO conductive layer (12) in example 3 comprises a silicon dioxide layer.

Example 4

Example 4 differs from example 3 in that the positions of the electrochromic layer (33) and the ion storage layer (51) are exchanged.

Example 5

Example 5 differs from example 3 in that the dimming layer (20) is a two-layer polymer disperse dye liquid crystal layer (21), the thickness of a single polymer disperse dye liquid crystal layer is 25 micrometers, an ITO/PET/ITO transparent interval conductive layer is sandwiched between the two layers, and the on-off state control is performed in a parallel manner, as shown in fig. 2.

The optical properties of the dimming devices in each example are shown in table 1:

Table 1 optical performance parameters of the dimmer devices of the various embodiments

Note that: in table PDCLC, the individual polymer disperse dye liquid crystal devices, EC, the individual electrochromic devices, and the dimming devices represent the overall dimming devices described in the examples.

Claims

1. The utility model provides a low drive voltage high contrast light modulation device which characterized in that, by first transparent conductive substrate, dimming layer, second transparent conductive substrate, electrolyte layer and third transparent conductive substrate closely connect in proper order and constitute, wherein:

The first transparent conductive substrate consists of a first base material layer and a first conductive layer, and the first conductive layer is tightly connected with the dimming layer;

the dimming layer comprises at least one polymer disperse dye liquid crystal layer;

the second transparent conductive substrate consists of a third conductive layer, a second base material layer, a fourth conductive layer and an ion storage layer in sequence, wherein the third conductive layer is tightly connected with the dimming layer;

Two sides of the electrolyte layer are respectively and tightly connected with the ion storage layer and the third transparent conductive substrate;

The third transparent conductive substrate is composed of an electrochromic layer, a fifth conductive layer and a third substrate layer in sequence, wherein the electrochromic layer is tightly connected with the electrolyte layer.

2. The low-drive voltage high-contrast dimmer device as claimed in claim 1, wherein the on-off contrast ratio is 15 or more.

3. The low-drive voltage high-contrast dimming device according to claim 1, wherein the dimming operation voltage of the polymer dispersed dye liquid crystal layer is 36V or less.

4. The low-drive voltage high-contrast dimming device according to claim 1, wherein the dimming operating voltage of the electrochromic layer is less than or equal to 3V, the voltage is adjustable in an energized state, and the contrast of the electrochromic layer is correspondingly changed.

5. The low-drive voltage high-contrast dimming device according to claim 1, wherein the polymer disperse dye liquid crystal layer has an on-state total light transmittance of not more than 80%.

6. The low-drive voltage high-contrast dimming device according to claim 1, wherein the polymer disperse dye liquid crystal layer has a thickness of not more than 25 μm and a switching state contrast of not less than 2.

7. The low-drive voltage high-contrast dimming device according to claim 1, wherein the polymer disperse dye liquid crystal layer has a thickness of not more than 15 μm and a switching state contrast of not less than 2.

8. The low-drive voltage high-contrast dimmer device according to claim 1, wherein the electrochromic layer has a on-off contrast of not less than 2.

9. The low drive voltage high contrast dimming device of claim 1, wherein the dimming layer comprises at least two of the polymer dispersed dye liquid crystal layers.

10. The low drive voltage high contrast dimming device of claim 9, wherein a transparent spacer conductive layer is disposed between the at least two polymer dispersed dye liquid crystal layers.

11. The low-drive voltage high-contrast dimming device according to claim 10, wherein the transparent spacer conductive layer is composed of a first spacer conductive layer, a second spacer conductive layer, and a transparent spacer substrate layer interposed between the first spacer conductive layer and the second spacer conductive layer.

12. The low-driving-voltage high-contrast dimming device according to claim 10, wherein more than two polymer disperse dye liquid crystal layers are electrically connected in parallel or in an independent control manner; the electrochromic layers are electrically connected in an independent control mode.

13. The utility model provides a low drive voltage high contrast light modulation device which characterized in that, by first transparent conductive substrate, dimming layer, second transparent conductive substrate, electrolyte layer and third transparent conductive substrate closely connect in proper order and constitute, wherein:

The second transparent conductive substrate consists of a third conductive layer, a second base material layer, a fourth conductive layer and an electrochromic layer in sequence, wherein the third conductive layer is tightly connected with the dimming layer;

Two sides of the electrolyte layer are respectively and tightly connected with the electrochromic layer and the third transparent conductive substrate layer;

The third transparent conductive substrate is composed of an ion storage layer, a fifth conductive layer and a third substrate layer in sequence, wherein the ion storage layer is tightly connected with the electrolyte layer.

14. A low-driving-voltage high-contrast dimming glass, which is characterized by comprising the low-driving-voltage high-contrast dimming device as claimed in any one of claims 1 to 13, wherein two sides of the dimming device are sequentially provided with a glue film layer and a glass layer respectively.