Liquid crystal display device

• US 8,384,858 B2
• Filed: 11/03/2010
• Issued: 02/26/2013
• Est. Priority Date: 11/06/2009
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Ono, Kikuo, Kanesaka, Kazumi
• Primary Examiner(s): NGUYEN, THANH NHAN P
• Application Number:
  US12/938,532
• Publication Number:
  US 20110109851A1
• Time in Patent Office: 846 Days
• Field of Search: None
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements

Abstract

A backlight source has a spectral distribution such that luminances of red and green light are stronger than luminance of blue light. A color filter includes a blue coloring layer that can best transmit a blue light, a red coloring layer that can best transmit a red light, a green coloring layer that can best transmit a green light, and a porous layer in which penetration holes are formed so as to penetrate therethrough in its thickness direction. The blue coloring layer is formed so as to be thicker than the red and green coloring layers. A liquid crystal layer is formed so as to be thinner in a portion facing the blue coloring layer than a portion facing the red and green coloring layers. The porous layer is formed from the same material and to have the same thickness as the blue coloring layer.

Claims

1. A liquid crystal display device comprising:

a first substrate;

a color filter disposed on the first substrate;

a second substrate;

a liquid crystal layer disposed between the color filter and the second substrate; and

a backlight source,

wherein the color filter includes a first coloring layer that can best transmit a first color light, a second coloring layer that can best transmit a second color light, a third coloring layer that can best transmit a third color light, and a porous layer in which a plurality of penetration holes are formed so as to penetrate therethrough in the thickness direction thereof, and

wherein the porous layer is formed from the same material as the third coloring layer,

wherein the colors of the first, second, and third color light are red, green, and blue, respectively,

wherein the third coloring layer is formed so as to be thicker than the first coloring layer and the second coloring layer,

wherein the liquid crystal layer is formed so as to be thinner in a portion facing the third coloring layer than a portion facing the first coloring layer and the second coloring layer, and

wherein the porous layer is formed to have the same thickness as the third coloring layer.

2. The liquid crystal display device according to claim 1,

wherein the plurality of penetration holes penetrate through the porous layer only in the thickness direction thereof.

3. The liquid crystal display device according to claim 1,

wherein the second coloring layer is formed so as to be thinner than the first coloring layer.

4. The liquid crystal display device according to claim 1,

wherein the backlight source has a spectral distribution such that the luminances of the first and second color light are stronger than the luminance of the third color light.

5. The liquid crystal display device according to claim 1, further comprising an overcoat film that eliminates difference in level on the porous layer.

6. A liquid crystal display device comprising:

a first substrate;

a color filter disposed on the first substrate;

a second substrate;

a liquid crystal layer disposed between the color filter and the second substrate; and

a backlight source,

wherein the color filter includes a first coloring layer that can best transmit a first color light, a second coloring layer that can best transmit a second color light, a third coloring layer that can best transmit a third color light, and a porous layer in which a plurality of penetration holes are formed so as to penetrate therethrough in the thickness direction thereof, and

wherein the porous layer is formed from the same material as the third coloring layer,

wherein the color filter further includes a fourth coloring layer that can best transmit a fourth color light, and

wherein the color of the fourth color light is cyan or yellow.

7. The liquid crystal display device according to claim 6,

wherein the plurality of penetration holes penetrate through the porous layer only in the thickness direction thereof.

8. The liquid crystal display device according to claim 6,

further comprising an overcoat film that eliminates difference in level on the porous layer.

9. A liquid crystal display device comprising:

a first substrate;

a color filter disposed on the first substrate;

a second substrate;

a liquid crystal layer disposed between the color filter and the second substrate; and

a backlight source,

wherein the color filter includes a first coloring layer that can best transmit a first color light, a second coloring layer that can best transmit a second color light, a third coloring layer that can best transmit a third color light, and a porous layer in which a plurality of penetration holes are formed so as to penetrate therethrough in the thickness direction thereof, and

wherein the porous layer is formed from the same material as the third coloring layer,

wherein the color filter further includes a fourth coloring layer that can best transmit a fourth color light, and

wherein the colors of the first, second, third, and fourth color light are red, green, cyan or yellow, and blue, respectively.

10. The liquid crystal display device according to claim 9,

wherein the plurality of penetration holes penetrate through the porous layer only in the thickness direction thereof.

11. The liquid crystal display device according to claim 9,

further comprising an overcoat film that eliminates difference in level on the porous layer.