Parallax compensating color filter and black mask for display apparatus

• US 7,388,631 B2
• Filed: 10/10/2002
• Issued: 06/17/2008
• Est. Priority Date: 10/10/2002
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Freeman, Gary A.
• Primary Examiner(s): Caley; Michael H
• Application Number:
  US10/268,463
• Publication Number:
  US 20040070706A1
• Time in Patent Office: 2,077 Days
• Field of Search: 349/106, 349/110, 349/113, 349/114, 349/115
• US Class Current: 349/110
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133567 on the back side

Abstract

A color display device comprising at least two substrates spaced from each other, the substrates each having an internal and an external surface, the internal surfaces of the two substrates facing each other, at least one of the substrates being transparent; electrodes positioned to establish a field in the space between the two substrates; an optically active material occupying at least a portion of the space between the two substrates and having optical properties influenced by the field; a color filter layer comprising color filter elements that alter the color of light traveling through the color filter layer, the color filter elements being positioned outside of the space between the two substrates; and a three-dimensional black mask comprising mask elements aligned with the boundaries between adjoining color filter elements. The three-dimensional black mask structure allows the color filter to be placed on the exterior of the display while still maintaining good color performance under off-axis viewing conditions.

Claims

1. A color display device including a surface disposed toward a source of light, comprising:

a first substrate;

a second substrate facing the first substrate with a gap therebetween;

an optically active material disposed in the gap between the first substrate and the second substrate;

a color filter layer formed on the first substrate separated from the optically active material and comprising a plurality of color filters, said color filter layer being located between said surface disposed toward said source of light and said optically active layer;

a black matrix aligned with boundaries between the color filters and comprising a first black matrix layer formed on the first substrate and a second black matrix layer formed on the first substrate and separated from the first black matrix layer with a gap therebetween.

2. The color display device of claim 1, wherein the first black matrix layer and the second black matrix layer are formed on different surfaces of the first substrate.

3. The color display device of claim 2, wherein the three-dimensional black mask further comprises a third black mask layer.

4. The color display device of claim 2, further comprising a third substrate formed on the color filter layer.

5. The color display device of claim 4, wherein the black mask layers comprise at least one internal layer located between the two substrates and two external layers, each located either on an exterior surface of one of the two substrates or on another substrate external to the two substrates.

6. The color display device of claim 4, wherein the threedimensional black mask has an aspect ratio of at least about 0.2.

7. The color display device of claim 6, wherein the aspect ratio of the black mask is at least about 0.5.

8. The color display device of claim 4, wherein the third substrate is formed between the first substrate and the color filter layer.

9. The color display device of claim 4, wherein the color filter layer is formed between the first substrate and the third substrate.

10. The color display device of claim 4, wherein the optically active material is a liquid crystal.

11. The color display device of claim 2, wherein the three-dimensional black mask has an aspect ratio of at least about 0.2.

12. The color display device of claim 11, wherein the aspect ratio of the black mask is at least about 0.35.

13. The color display device of claim 1, wherein the color filter layer is formed by printing process.

14. The color display device of claim 1, wherein the color filter layer comprises multiple sublayers, at least one for each different color.

15. The color display device of claim 1, wherein the first substrate is formed between the optically active layer and the color filter layer.

16. The color display device of claim 1, further comprising a third substrate formed on the color filter.

17. The color display device of claim 1, wherein a gap between the optically active material and the color filter layer is greater than 1 mil.

18. The color display device of claim 1, wherein each substrate has a thickness in the range of about 20 pm to 500 pm.

19. The color display device of claim 18, wherein each substrate has a thickness in the range of about 30 pm to 250 pm.

20. The color display device of claim 19, wherein each substrate has a thickness in the range of about 50 pm to 150 pm.

21. A display device including a surface disposed toward a source of light, comprising:

a first panel positioned directly adjacent said light disposed surface and comprising a first substrate and a color filter layer;

a second panel comprising a second substrate;

a liquid crystal layer separated from said color filter layer and formed between the first panel and the second panel; and

a black matrix aligned with boundaries between the color filters and comprising first and second black matrix layers formed at the first panel and separated from each other with a gap there between.

22. The display device of claim 21, wherein the first and second black matrix layers are formed on the first substrate.

23. The display device of claim 22, wherein the first and second black matrix layers are formed on different surfaces of the first substrate.

24. The display device of claim 23, wherein the second black matrix layer is formed between the first substrate and the color filter layer.

25. The display device of claim 22, wherein the first panel further comprises a third substrate.

26. The display device of claim 25, wherein the black matrix further comprises a third black matrix layer formed on the third substrate.

27. The display device of claim 26, wherein the third substrate is formed between the first substrate and the color filter layer.

28. The display device of claim 27, wherein the third black matrix layer is formed between the color filter layer and the third substrate.

29. The display device of claim 26, wherein the color filter is formed between the first substrate and the third substrate.

30. The display device of claim 29, wherein the third black matrix layer is formed between the color filter layer and the third substrate.

31. The display device of claim 21, wherein an aspect ratio of the black matrix is equal to or more than about 0.2.

32. The display device of claim 31, wherein the aspect ratio of the black matrix is equal to or more than 0.35.

33. The display device of claim 32, wherein the aspect ratio of the black matrix is equal to or more than 0.5.