# US 10,481,424 B2 · Glass panel comprising a liquid crystal film

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- Number: US 10,481,424 B2
- Document ID: US10481424B2
- Status: Granted
- Kind: B2
- Application number: 15/316,048
- Filed: 2015-05-28
- Published: 2017-03-30
- Granted: 2019-11-19
- Earliest claimed: 2014-06-04
- Assignees: Agc Glass Europe
- Applicants: Agc Glass Europe
- Inventors: Jonathan Vivier
- Web page: https://patentgrep.com/patent/US10481424B2

## CPC

- G02F 1/1334: based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10504: {Liquid crystal layer}
- B32B 17/10651: {comprising colorants, e.g. dyes or pigments}
- B32B 17/10761: {containing vinyl acetal}
- B32B 17/10779: {containing polyester}
- B32B 2255/20: Inorganic coating
- B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
- G02F 1/13306: {Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence)}
- G02F 1/137: characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F 1/13756: {the liquid crystal selectively assuming a light-scattering state (G02F1/1334, G02F1/13718 take precedence)}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A laminated automotive glazing including a PDLC film powered electrically by an AC current or a frequency lower than 100 Hz. The voltage varies non-sinusoidally, and a maximum of an effective voltage does not exceed 80 Vrms.

## Claims

### Claim 1

A laminated automotive glazing comprising:
a PDLC film powered electrically by an AC current having a frequency of from 20 Hz to less than 50 Hz, a voltage varying non-sinusoidally, a maximum of an effective voltage not exceeding 55 Vrms,
wherein a residual scattering in an actuated state is no higher than 5% for a temperature not exceeding 50° C., and
wherein power required to obtain the actuated state is no higher than 10 W/m2 of PDLC film.

### Claim 2 (depends on 1)

The glazing according to claim 1, wherein the maximum of the effective voltage does not exceed 50 Vrms and a minimum effective voltage is 30 Vrms.

### Claim 3 (depends on 1)

The glazing according to claim 1, wherein a voltage variation has a trapezoidal profile.

### Claim 4 (depends on 3)

The glazing according to claim 3, wherein the voltage does not exceed 50 Vrms.

### Claim 5 (depends on 3)

The glazing according to claim 3, wherein the voltage variation has a trapezoidal shape with a rise time of 0.5 to 2 ms.

### Claim 6 (depends on 1)

The glazing as claimed in claim 1, wherein the frequency is no lower than 25 Hz.

### Claim 7 (depends on 1)

The glazing according to claim 1, wherein the residual scattering in the actuated state is no higher than 3% for a temperature not exceeding 60° C.

### Claim 8 (depends on 1)

The glazing according to claim 1, wherein a direct light transmission in the unactuated state is no higher than 1%.

### Claim 9 (depends on 1)

The glazing according to claim 1, wherein a direct light transmission in the unactuated state is no higher than 0.5%.

### Claim 10 (depends on 1)

The glazing according to claim 1, wherein power required to obtain the actuated state is no higher than 5 W/m2 of PDLC film.

### Claim 11 (depends on 1)

The glazing according to claim 1, wherein a voltage variation has a square profile.

### Claim 12 (depends on 1)

The glazing according to claim 1, wherein the maximum of the effective voltage does not exceed 50 Vrms.

### Claim 13 (depends on 1)

The glazing according to claim 1, wherein the PDLC film is powered electrically by an AC current having a frequency of 30 Hz or lower.

### Claim 14 (depends on 13)

The glazing according to claim 13, wherein the PDLC film is powered by a current that does not exceed 200 mA.

### Claim 15

An automotive roof comprising:
two glass sheets;
a first interlayer sheet; and
a PDLC film powered electrically by an AC current having a frequency of from 20 Hz to less than 50 Hz, a voltage varying non-sinusoidally, and a maximum of an effective voltage not exceeding 50 Vrms,
wherein a residual scattering in an actuated state is no higher than 5% for a temperature not exceeding 50° C., and
wherein power required to obtain the actuated state is no higher than 10 W/m2 of PDLC film.

### Claim 16 (depends on 15)

The glazing according to claim 15, wherein a voltage variation has a trapezoidal profile.

### Claim 17 (depends on 15)

The glazing according to claim 15, further comprising second and third interlayer sheets,
wherein the second interlayer sheet defines a housing for the PDLC film.

### Claim 18 (depends on 15)

The glazing according to claim 15, wherein the minimum effective voltage is 30 Vims.