DIFFUSER FILMS AND METHODS FOR MAKING AND USING THE SAME

1 . A diffuser film, comprising:

a polymer composition;

a first surface; and

a second surface opposite the first surface;

wherein the diffuser film is capable of diffusing light; and

wherein the diffuser film, without a coating, has a film haze of about 10% to about 80%, and has no visible mura defects under panel observation as determined with a backlight display having a center brightness of about 6,000 nit to about 6,300 nit.

2 . The film of claim 1 , wherein the first surface has a first surface Ra of less than or equal to about 1 μm, and the second surface has a second surface Ra of less than or equal to about 1 μm.

3 . The film of claim 2 , wherein the first surface Ra and the second surface Ra are each, individually, less than or equal to about 0.7 μm.

4 . The film of claim 3 , wherein the first surface Ra and the second surface Ra are each, individually, about 0.2 μm to about 0.6 μm.

5 . The film of claim 2 , wherein the first surface Ra and the second surface Ra are each, individually, about 0.2 μm to about 0.7 μm.

6 . The film of claim 2 , wherein the film haze is about 40% to about 80%, and no visible mura defects.

7 . The film of claim 6 , wherein the first surface Ra and the second surface Ra are each, individually, about 0.2 μm to about 0.7 μm.

8 . The film of claim 1 , wherein the polymer composition comprises polycarbonate.

9 . The film of claim 1 , wherein the film haze is about 40% to about 80%, and no visible mura defects.

10 . A diffuser film, comprising:

a polymer composition;

a first surface; and

a second surface opposite the first surface;

wherein the diffuser film is capable of diffusing light; and

wherein the diffuser film, without a coating, has fewer visible mura defects under panel observation as determined with a backlight display having a center brightness of about 6,000 nit to about 6,300 nit, than a second diffuser film comprising the polymer composition, and having the same thickness and haze, and having a surface with an average second diffuser surface Ra of greater than 1.3 μm.

11 . The film of claim 10 , wherein the first surface has a first surface Ra of less than or equal to about 1 μm, and the second surface has a second surface Ra of less than or equal to about 1 μm.

12 . The film of claim 11 , wherein the first surface Ra and the second surface Ra are each, individually, less than or equal to about 0.7 μm.

13 . The film of claim 10 , wherein the polymer composition comprises polycarbonate.

14 . The film of claim 10 , wherein the film has a film haze of about 40% to about 80%, and no visible mura defects.

15 . The film of claim 14 , wherein the first surface has a first surface Ra of about 0.2 μm to about 0.7 μm, and the second surface has a second surface Ra of about 0.2 μm to about 0.7 μm.

16 . A method for making a diffuser film, comprising:

heating a polymer to greater than or equal to a glass transition temperature of the polymer to form a polymer melt; and

producing the diffuser film with a surface texture on each side of the diffuser film;

wherein the diffuser film is capable of diffusing light; and

wherein the diffuser film, without a coating, has no visible mura defects under panel observation as determined with a backlight display having a center brightness of about 4,000 nit to about 6,300 nit.

17 . The method of claim 16 , wherein producing the diffuser film further comprises

extruding the polymer melt; and

introducing the polymer melt to a nip between a first calendaring roll and a second calendaring roll.

18 . The method of claim 16 , wherein the first calendaring roll and the second calendaring roll, individually, have a Ra of less than or equal to about 1 μm.

19 . The method of claim 16 , wherein the surface texture on each side of the film is, individually, less than or equal to about 0.7 μm.

20 . The method of claim 16 , wherein the diffuser film has a film haze of about 40% to about 80%.

21 . The method of claim 16 , wherein the center brightness is about 6,000 to about 6,300.