COLOR FILTER USING SURFACE PLASMON AND LIQUID CRYSTAL DISPLAY DEVICE

• US 20110102716A1
• Filed: 10/29/2010
• Published: 05/05/2011
• Est. Priority Date: 10/30/2009
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: PARK, Se-Young, Lee, Cheol-Hwan, Yi, Sung-Chol, Kim, Jeong-Hyun, Lee, Chang-Gu
• Granted Patent: US 8,593,595 B2
• Time in Patent Office: Days
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G02F 2203/10 plasmon

Abstract

Discussed are a color filter using a surface plasmon and a liquid crystal display (LCD) device, the color filter capable of enhancing a transmittance ratio of an LC panel by having a 3D pattern structure of a transmissive pattern for selectively transmitting light of a specific wavelength, and capable of simplifying entire processes. According to the color filter using a surface plasmon and the LCD device, not only three colors of RGB but also multi-colors can be implemented, and color reproduction can be enhanced by optimizing arrangement of the transmissive pattern according to the number of colors to be implemented.

Claims

1. A color filter using a surface plasmon, the color filter comprising:

a first sub-color filter for implementing a red color by forming a first sub-wavelength transmissive pattern having a predetermined period on a first metal layer;

a second sub-color filter for implementing a green color by forming a second sub-wavelength transmissive pattern having a predetermined period on a second metal layer; and

a third sub-color filter for implementing a blue color by forming a third sub-wavelength transmissive pattern having a predetermined period on a third metal layer,

wherein the first to third sub-color filters are tangent to one another in a hexagonal shape, and lines connecting centers of the first to third sub-color filters to one another form a triangle.

2. A color filter using a surface plasmon, the color filter comprising:

a first sub-color filter for implementing a red color by forming a first sub-wavelength transmissive pattern having a predetermined period on a first metal layer;

a second sub-color filter for implementing a green color by forming a second sub-wavelength transmissive pattern having a predetermined period on a second metal layer;

a third sub-color filter for implementing a blue color by forming a third sub-wavelength transmissive pattern having a predetermined period on a third metal layer; and

a fourth sub-color filter for implementing a yellow color or a cyan color by forming a fourth sub-wavelength transmissive pattern having a predetermined period on a fourth metal layer,

wherein the first to fourth sub-color filters are tangent to one another in a quadrangular shape, and lines connecting centers of the first to fourth sub-color filters to one another form a quadrangle.

3. A color filter using a surface plasmon, the color filter comprising:

a first sub-color filter for implementing a red color by forming a first sub-wavelength transmissive pattern having a predetermined period on a first metal layer;

a second sub-color filter for implementing a green color by forming a second sub-wavelength transmissive pattern having a predetermined period on a second metal layer;

a third sub-color filter for implementing a blue color by forming a third sub-wavelength transmissive pattern having a predetermined period on a third metal layer;

a fourth sub-color filter for implementing a yellow color by forming a fourth sub-wavelength transmissive pattern having a predetermined period on a fourth metal layer; and

a fifth sub-color filter for implementing a cyan color by forming a fifth sub-wavelength transmissive pattern having a predetermined period on a fifth metal layer,

wherein four of the first to fifth sub-color filters are tangent to one another in a quadrangular shape, and the rest one sub-color filter is positioned inside the quadrangle in a diamond shape.

4. A liquid crystal display (LCD) device, comprising:

a first substrate;

a color filter formed on the first substrate, for implementing RGB colors by forming, on first to third metal layers, first to third sub-wavelength transmissive patterns each having a predetermined period;

a thin film transistor formed on the first substrate having the color filter formed thereon; and

a second substrate bonded to the first substrate with facing the first substrate,

wherein first to third sub-color filters of the color filter are tangent to one another in a hexagonal shape, and lines connecting centers of the first to third sub-color filters to one another form a triangle.

5. The LCD device of claim 4, further comprising an insulating layer formed on the color filter and formed of a material of the first substrate.

6. The LCD device of claim 4, wherein the first to third transmissive patterns have not only a circular shape such as a hole, but also various shapes such as an oval shape, a quadrangular shape, a triangular shape, and a slit shape.

7. The LCD device of claim 4, wherein the first to third metal layers are formed of one of aluminum, molybdenum, copper, gold, silver and chrome.

8. A liquid crystal display (LCD) device, comprising:

a first substrate;

a color filter formed on the first substrate, for implementing RGBY or RGBC colors by forming, on first to fourth metal layers, first to fourth sub-wavelength transmissive patterns each having a predetermined period;

a thin film transistor formed on the first substrate having the color filter formed thereon; and

a second substrate bonded to the first substrate with facing the first substrate,

wherein first to fourth sub-color filters of the color filter are tangent to one another in a quadrangular shape, and lines connecting centers of the first to fourth sub-color filters to one another form a quadrangle.

9. The LCD device of claim 8, further comprising an insulating layer formed on the color filter and formed of a material of the first substrate.

10. The LCD device of claim 8, wherein the first to fourth transmissive patterns have not only a circular shape such as a hole, but also various shapes such as an oval shape, a quadrangular shape, a triangular shape, and a slit shape.

11. The LCD device of one of claims 8, wherein the first to fourth metal layers are formed of one of aluminum, molybdenum, copper, gold, silver and chrome.

12. A liquid crystal display (LCD) device, comprising:

a first substrate;

a color filter formed on the first substrate, for implementing RGBYC colors by forming, on first to fifth metal layers, first to fifth sub-wavelength transmissive patterns each having a predetermined period;

a thin film transistor formed on the first substrate having the color filter formed thereon; and

a second substrate bonded to the first substrate with facing the first substrate,

wherein four of first to fifth sub-color filters of the color filter are tangent to one another in a quadrangular shape, and the rest one sub-color filter is positioned inside the quadrangle in a diamond shape.

13. The LCD device of one of claims 12, further comprising an insulating layer formed on the color filter and formed of a material of the first substrate.

14. The LCD device of claim 12, wherein the first to fifth transmissive patterns have not only a circular shape such as a hole, but also various shapes such as an oval shape, a quadrangular shape, a triangular shape, and a slit shape.

15. The LCD device of claim 12, wherein the first to fifth metal layers are formed of one of aluminum, molybdenum, copper, gold, silver and chrome.

16. A liquid crystal display (LCD) device, comprising:

a first substrate;

a color filter formed on the first substrate, for implementing RGBYC colors by forming, on first to fifth metal layers, first to fifth sub-wavelength transmissive patterns each having a predetermined period;

a thin film transistor formed on the first substrate having the color filter formed thereon; and

a second substrate bonded to the first substrate with facing the first substrate, wherein first to fifth sub-color filters of the color filter are sequentially arranged in a quadrangular shape to have a form of stripes.

17. The LCD device of claim 16, further comprising an insulating layer formed on the color filter and formed of a material of the first substrate.

18. The LCD device of claim 16, wherein the first to fifth transmissive patterns have not only a circular shape such as a hole, but also various shapes such as an oval shape, a quadrangular shape, a triangular shape, and a slit shape.

19. The LCD device of claim 16, wherein the first to fifth metal layers are formed of one of aluminum, molybdenum, copper, gold, silver and chrome.