# US 8,771,448 B2 · Curvature reduction for switchable polymer lenticulars

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- Number: US 8,771,448 B2
- Document ID: US8771448B2
- Status: Granted
- Kind: B2
- Application number: 13/771,454
- Filed: 2013-02-20
- Published: 2013-06-27
- Granted: 2014-07-08
- Earliest claimed: 2006-08-24
- Assignees: Koninklijke Philips N.V.
- Applicants: Koninklijke Philips Electronics N.V.
- Inventors: Hans Zuidema
- Web page: https://patentgrep.com/patent/US8771448B2

## CPC

- G02F 1/29: for the control of the position or the direction of light beams, i.e. deflection
- G02B 3/0012: {characterised by the manufacturing method}
- G02B 30/27: involving lenticular arrays
- G02B 30/28: involving active lenticular arrays
- Y10T 156/10: Methods of surface bonding and/or assembly therefor
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for fabricating lenticulars includes applying a rubbing layer on a lenticular structure. The rubbing layer is baked on the lenticular structure before installation of the lenticular structure on a plate. After baking, the lenticular structure is applied to the plate.

## Claims

### Claim 1

A method for fabricating lenticulars, comprising the acts of:
applying a rubbing layer on a lenticular foil having lenticular cavities, wherein the lenticular foil is unattached to a plate having a coefficient of thermal expansion different from the lenticular foil;
baking the rubbing layer on the lenticular foil in an unconstrained condition before installation of the lenticular foil on the plate;
after baking, applying the lenticular foil to the plate;
rubbing the rubbing layer;
filling the lenticular cavities in the lenticular foil with liquid crystal material;
applying a substrate with a second rubbing layer to seal the liquid crystal in the lenticular cavities to form lenticulars;
forming electrodes adjacent to the lenticulars for altering an electric field to permit switching of the lenticulars, and
providing a display portion to illuminate the switchable lenticulars using pixels and control switching operations of the lenticulars.

### Claim 2 (depends on 1)

The method as recited in claim 1, further comprising rubbing the second rubbing layer.

### Claim 3 (depends on 1)

The method as recited in claim 1, wherein the rubbing layer includes polyimide and the act of baking includes applying a temperature of between about 120 to about 180 degrees Centigrade.

### Claim 4 (depends on 1)

The method as recited in claim 1, wherein the plate includes a glass plate and the act of applying the lenticular foil includes laminating the lenticular foil to the glass plate.

### Claim 5 (depends on 1)

The method as recited in claim 1, wherein the lenticulars include switchable lenticulars, the method further comprising the act of forming conductive electrodes to switch modes of the lenticulars.

### Claim 6 (depends on 1)

The method as recited in claim 1, wherein the act of applying a rubbing layer includes one of printing and spinning on the rubbing layer.