POLARIZING MULTILAYER FILM, METHOD OF USING SAME, AND METHOD FOR PRODUCING A DEVICE COMPRISING THE FILM

• US 20150109668A1
• Filed: 10/21/2014
• Published: 04/23/2015
• Est. Priority Date: 10/23/2013
• Status: Active Grant

• Current Assignee: e.solutions GmbH
• Original Assignee: e.solutions GmbH
• Inventors: Franke, Thomas, Rasmussen, Jens
• Granted Patent: US 9,753,202 B2
• Time in Patent Office: Days
• US Class Current: 359/489.07
• CPC Class Codes: B32B 2309/105 Thickness
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 2457/208 Touch screens
• CPC Class Codes: B32B 2551/00 Optical elements
• CPC Class Codes: B32B 37/12 characterised by using adhesives
• CPC Class Codes: B32B 37/18 involving the assembly of discrete sheets or panels only
• CPC Class Codes: B32B 38/10 Removing layers, or parts of layers, mechanically or chemically
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001

Abstract

A polarizing multilayer film is provided. The polarizing multilayer film comprises a first adhesive layer, a second adhesive layer, a polarization layer which is arranged between the first and second adhesive layers, a first separating film which is removably arranged on a side of the first adhesive layer remote from the polarization layer, and a second separating film which is removably arranged on a side of the second adhesive layer remote from the polarization layer. There are further provided a method of using the polarizing multilayer film and a method for producing a screen, a light-emitting decorative element or another device using the polarizing multilayer film.

Claims

1. Polarizing multilayer film comprising:

a first adhesive layer;

a second adhesive layer;

a polarization layer which is arranged between the first and second adhesive layers;

a first separating film which is removably arranged on a side of the first adhesive layer remote from the polarization layer; and

a second separating film which is removably arranged on a side of the second adhesive layer remote from the polarization layer.

2. Polarizing multilayer film according to claim 1, wherein at least one of the first and second adhesive layer comprises optically clear adhesive.

3. Polarizing multilayer film according to claim 1, wherein at least one of the first and second adhesive layer comprises a pressure sensitive adhesive, PSA.

4. Polarizing multilayer film according to claim 1, wherein the first adhesive layer has a thickness of between 5 and 50 micrometres.

5. Polarizing multilayer film according to claim 1, wherein the second adhesive layer has a thickness of between 50 and 400 micrometres.

6. Polarizing multilayer film according to claim 1, wherein the polarization layer comprises a circular polarizer.

7. Polarizing multilayer film according to claim 6, wherein the circular polarizer comprises a linear polarizer and a first retarder layer in the form of a quarter-wave layer for an optical wavelength in the visible range.

8. Polarizing multilayer film according to claim 6, further comprising a second retarder layer in the form of a half-wave layer for an optical wavelength in the visible range, wherein the second retarder layer is arranged between the first and second adhesive layers.

9. Polarizing multilayer film according to claim 7, wherein the half-wave layer is arranged between the linear polarizer and the quarter-wave layer.

10. Polarizing multilayer film according to claim 7, wherein the linear polarizer and all the retarder layers are each adhesively bonded to one another.

11. Polarizing multilayer film according to claim 1, wherein the optical and mechanical properties of the polarizing multilayer film without the separating films exhibit no significant impairment after at least five hundred hours'"'"' continuous exposure to an ambient temperature of 60°

C. at a relative humidity of between 92 and 95% and/or after at least five hundred hours'"'"' continuous exposure to an ambient temperature of 95°

C.

12. Polarizing multilayer film according to claim 1, wherein the separating films allow the polarizing multilayer film to be handled separately.

13. Method of using a polarizing multilayer film for producing a device, in particular a light-emitting device, wherein the polarizing multilayer film comprises:

a first adhesive layer;

a second adhesive layer;

a polarization layer which is arranged between the first and second adhesive layers;

a first separating film which is removably arranged on a side of the first adhesive layer remote from the polarization layer; and

a second separating film which is removably arranged on a side of the second adhesive layer remote from the polarization layer,

the method comprising;

removing the first and second separating films from the multilayer film; and

arranging the multilayer film without the separating films between a functional assembly group and an upper structure of the device.

14. Method for producing a device, in particular for use in a motor vehicle, using a polarizing multilayer film, wherein the polarizing multilayer film comprises:

a first adhesive layer;

a second adhesive layer;

a polarization layer which is arranged between the first and second adhesive layers;

a first separating film which is removably arranged on a side of the first adhesive layer remote from the polarization layer; and

a second separating film which is removably arranged on a side of the second adhesive layer remote from the polarization layer,

wherein the method comprises the following steps;

providing an upper structure;

removing the first separating film from the first adhesive layer;

adhesively bonding the polarizing multilayer film without the first separating film to the upper structure by means of the first adhesive layer;

providing a functional assembly group;

removing the second separating film from the second adhesive layer;

adhesively bonding the polarizing multilayer film without the second separating film to the functional assembly group by means of the second adhesive layer.

15. Method according to claim 14, wherein at least one of the adhesive bonding steps comprises laminating.

16. Method according to claim 14, further comprising:

removing air inclusions in the adhesive bonds by means of autoclaving.

17. Method according to claim 14, wherein the upper structure comprises a covering layer.

18. Method according to claim 14, wherein the method is used to produce a screen, and wherein the functional assembly group comprises a display of the screen.

19. Method according to claim 18, wherein the screen is a touch-sensitive screen, and wherein the functional assembly group further comprises a touch sensor layer which is arranged on one side of the functional assembly group, and wherein the polarizing multilayer film is adhesively bonded to the touch sensor layer of the functional assembly group by means of the second adhesive layer.

20. Method according to claim 14, wherein the method is used to produce a light-emitting decorative element, and wherein the functional assembly group comprises a light source of the light-emitting decorative element or an optical fibre.