Color filter and liquid crystal display device

• US 6,859,243 B2
• Filed: 12/04/2000
• Issued: 02/22/2005
• Est. Priority Date: 12/09/1999
• Status: Expired due to Term

• Current Assignee: Toray Industries Incorporated
• Original Assignee: Toray Industries Incorporated
• Inventors: Tsukamoto, Jun, Yamashita, Tetsuo
• Primary Examiner(s): Kim, Robert H.
• Assistant Examiner(s): Di Grazio, Jeanne Andrea
• Application Number:
  US10/149,071
• Publication Number:
  US 20030003378A1
• Time in Patent Office: 1,541 Days
• Field of Search: 349/106
• US Class Current: 349/106
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: G02F 1/133514 Colour filters

Abstract

By preparing a color filter including blue dots whose chromaticity coordinates (z, Z) in the XYZ colorimetric system, measured with CIE standard light source C, satisfy the relational expressions 114>Z>−1087023z⁴+3205105z³−3545958z²+1744329z−321773 and 0.73≦z≦0.81, a color filter exhibiting an excellent color reproducibility and a high transmittance can be realized and thus a liquid crystal display device capable of displaying as colorful images as in CRT television sets can be achieved.

Claims

1. A liquid crystal display device comprising:

a color filter comprising at least blue dots, red dots, and green dots; and

a backlight source, wherein the chromaticity coordinates (x, y) in the XYZ colorimetric system of the blue dots, measured with CIE standard light source C, satisfy the expressions 0.13≦

x≦

0.15 and 0.08≦

y≦

0.12, and the chromaticity coordinates (x, y) in the XYZ colorimetric system of the backlight source satisfy he expressions 0.265≦

x≦

0.29 and 0.24≦

y≦

0.30.

2. A liquid crystal display device according to claim 1, wherein the chromaticity coordinates (x, y) in the XYZ colorimetric system of the red dots, measured with CIE standard light source C, satisfy the expressions 0.635≦

x≦

0.665 and 0.31≦

y≦

0.35.

3. A liquid crystal display device according to claim 2, wherein the chromaticity coordinates (x, y) in th XYZ colorimetric system of the green dots, measured with CIE standard light source C, satisfy the expressions 0.2≦

x≦

0.34 and 0.56≦

y≦

0.65.

4. A liquid crystal display device according to claim 1, wherein the chromaticity coordinates (z, Z) in the XYZ colorimetric system of the blue dots, measured with CIE standard light source C, satisfy the expressions 114>

Z >

−

1087023z⁴3205105z³−

3545958z²+1744329z−

321773 and 0.73≦

z≦

0.81.

5. A liquid crystal display device according to claim 1, wherein the color temperature of the white color displayed thereby is in the range of 9000 to 11000 K.

6. A liquid crystal display device according to claim 1, wherein the blue dots comprise Pigment Blue 15:

6 (PB15;

6) and Pigment Violet 23 (PV23) such that the mixture ratio of PB15;

6 to PV23 is in the range of 96/4 to 70/30, and the chromatically coordinate z in the XYZ colorimetric system of the blue dots, measured with CIE standard light source C, satisfies 0.73≦

z≦

0.81.