Color filter using surface plasmon and liquid crystal display device

• US 8,593,595 B2
• Filed: 10/29/2010
• Issued: 11/26/2013
• Est. Priority Date: 10/30/2009
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Jeong-Hyun, Yi, Sung-Chol, Lee, Chang-Gu, Lee, Cheol-Hwan, Park, Se-Young
• Primary Examiner(s): CALEY, MICHAEL H
• Application Number:
  US12/916,324
• Publication Number:
  US 20110102716A1
• Time in Patent Office: 1,124 Days
• Field of Search: 349/105, 349/106, 359/585, 359/589
• 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 liquid crystal display (LCD) device, comprising:

a first substrate;

a color filter formed on the first substrate, for implementing RGB colors by forming, in first to third metal layers, first to third sub-wavelength holes each having a different period,

wherein the metal layers having the sub-wavelength holes are used as the color filter using a surface plasmon occurring from the metal layers, and

wherein each thickness of the metal layer corresponding to each color is differently controlled;

an insulating layer formed on the metal layers including an inside of the sub-wavelength holes and formed of a same dielectric material as that of the first substrate;

a thin film transistor formed on the insulating layer; 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.

2. The LCD device of claim 1, wherein the first to third metal layers are formed of one of aluminum, molybdenum, copper, gold, silver and chrome.

3. 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, in first to fourth metal layers, first to fourth sub-wavelength holes each having a different period,

wherein the metal layers having the sub-wavelength holes are used as the color filter using a surface plasmon occurring from the metal layers, and

wherein each thickness of the metal layer corresponding to each color is differently controlled;

an insulating layer formed on the metal layers including an inside of the sub-wavelength holes and formed of a same dielectric material as that of the first substrate;

a thin film transistor formed on the insulating layer; 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.

4. The LCD device of one of claims 3, wherein the first to fourth metal layers are formed of one of aluminum, molybdenum, copper, gold, silver and chrome.

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

a first substrate;

a color filter formed on the first substrate, for implementing RGBYC colors by forming, in first to fifth metal layers, first to fifth sub-wavelength holes each having a different period,

wherein the metal layers having the sub-wavelength holes are used as the color filter using a surface plasmon occurring from the metal layers, and

wherein each thickness of the metal layer corresponding to each color is differently controlled;

an insulating layer formed on the metal layers including an inside of the sub-wavelength holes and formed of a same dielectric material as that of the first substrate;

a thin film transistor formed on the insulating layer; 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.

6. The LCD device of claim 5, wherein the first to fifth metal layers are formed of one of aluminum, molybdenum, copper, gold, silver and chrome.

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

a first substrate;

a color filter formed on the first substrate, for implementing RGBYC colors by forming, in first to fifth metal layers, first to fifth sub-wavelength holes each having a different period,

wherein the metal layers having the sub-wavelength holes are used as the color filter using a surface plasmon occurring from the metal layers, and

wherein each thickness of the metal layer corresponding to each color is differently controlled;

an insulating layer formed on the metal layers including an inside of the sub-wavelength holes and formed of a same dielectric material as that of the first substrate;

a thin film transistor formed on the insulating layer; 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.

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