Filter, plasma display device including the same and method of manufacturing the filter

• US 20070228965A1
• Filed: 03/26/2007
• Published: 10/04/2007
• Est. Priority Date: 03/28/2006
• Status: Abandoned Application

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Moon, Dong-Gun, Hur, Sang-Yeol, Bae, Jae-Woo, Cha, Jun-Kyu, Oh, Wan-Seog
• Application Number:
  US11/727,296
• Publication Number:
  US 20070228965A1
• Time in Patent Office: Days
• US Class Current: 313/582
• CPC Class Codes: G02B 3/0031 Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
• CPC Class Codes: G02B 3/005 arranged along a single direction only, e.g. lenticular sheets G02B3/0043 takes precedence
• CPC Class Codes: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085
• CPC Class Codes: G02B 5/003 Light absorbing elements
• CPC Class Codes: G03B 21/62 Translucent screens

Abstract

A filter including a base film, a plurality of light absorption units spaced apart from one another at regular intervals in the base film, and a focusing layer on the base film. The focusing layer may include a plurality of longitudinal crests or microlenses aligned with the light absorption units.

Claims

1. A filter, comprising:

a base film;

a plurality of light absorption units spaced apart from one another at regular intervals in the base film; and

a focusing layer on the base film, the focusing layer having a front surface with a plurality of convex shapes.

2. The filter as claimed in claim 1, wherein the light absorption units have a width that is about 0.1 to about 3.0 times a height thereof.

3. The filter as claimed in claim 1, wherein each light absorption unit corresponds to a center of a respective convex shape of the focusing layer.

4. The filter as claimed in claim 1, wherein a front surface of each light absorption unit is in communication with the focusing layer.

5. The filter as claimed in claim 1, wherein the convex shapes of the focusing layer are longitudinal crests.

6. The filter as claimed in claim 1, wherein the convex shapes of the focusing layer are hemispheres.

7. The filter as claimed in claim 1, wherein the base film includes stains or pigments.

8. The filter as claimed in claim 1, further comprising an antireflection layer.

9. The filter as claimed in claim 8, wherein the antireflection layer includes a hard coating material.

10. The filter as claimed in claim 8, further comprising a hard coating layer on the antireflection layer.

11. The filter as claimed in claim 1, further comprising an electromagnetic wave shield layer, at least one adhesive layer, a near infrared ray blocking layer, a color correction layer, or a combination thereof.

12. A plasma display device, comprising:

a plasma display panel;

a chassis on a rear surface of the plasma display panel;

at least one driving circuit board on a rear surface of the chassis base and electrically connected to the plasma display panel; and

a filter on a front panel of the plasma display panel, wherein the filter includes a base film, a plurality of light absorption units spaced apart from one another at regular intervals in the base film; and

a focusing layer on the base film, the focusing layer having a front surface with a plurality of convex shapes.

13. The plasma display device as claimed in claim 12, wherein the convex shapes of the focusing layer are longitudinal crests.

14. The plasma display device as claimed in claim 12, wherein the convex shapes of the focusing layer are hemispheres.

15. A method of manufacturing a filter, comprising:

depositing a photoresist layer on a substrate having electrical conductivity;

forming coating patterns in the photoresist layer;

depositing a metal layer in the coating patterns;

removing the photoresist layer;

oxidizing the metal layer to form light absorption units;

adhering a focusing layer with a plurality of visible ray focusing units to the light absorption units;

separating the light absorption units from the substrate; and

forming a base film layer in communication with the light absorption units and with a rear surface of the focusing layer.

16. The method as claimed in claim 15, wherein forming coating patterns includes partially exposing the photoresist layer.

17. The method as claimed in claim 15, wherein forming the coating patterns includes forming stripe-shaped grooves spaced apart from each other at regular intervals in the photoresist layer.

18. The method as claimed in claim 15, wherein forming the coating patterns includes forming vertical slits with a predetermined diameter, the vertical slits being spaced apart from each other at regular intervals on the photoresist layer.

19. The method as claimed in claim 15, wherein depositing the metal layer includes depositing a copper layer.

20. The method as claimed in claim 15, wherein oxidizing the metal layer includes immersing the metal layer in an alkaline solution.

21. The method as claimed in claim 15, wherein the visible ray focusing units are formed at regular intervals of an upper surface of the focusing layer by melting and pressing a transparent resin in a mold or by extruding a heated resin in an embossing roll mold.

22. The method as claimed in claim 21, wherein the visible ray focusing units are formed as longitudinal crests.

23. The method as claimed in claim 21, wherein the visible ray focusing units are formed as a plurality of microlenses.

24. The method as claimed in claim 15, wherein adhering the focusing layer to the light absorption units includes depositing an adhesive layer therebetween.

25. The method as claimed in claim 15, wherein adhering the focusing layer to the light absorption units includes adhering each light absorption unit to a center of a respective visible ray focusing unit.

26. The method as claimed in claim 15, further comprising depositing stains or pigments in the base film.

27. The method as claimed in claim 15, further comprising forming an antireflection layer, an electromagnetic wave shield layer, a adhesive layer, a near infrared ray blocking layer, a color correction layer, or a combination thereof on the filter.