Colot filter and liquid crystal display device

• US 20030003378A1
• Filed: 06/07/2002
• Published: 01/02/2003
• Est. Priority Date: 12/09/1999
• Status: Active Grant

• Current Assignee: Toray Industries Incorporated
• Original Assignee: Toray Industries Incorporated
• Inventors: Yamashita, Tetsuo, Tsukamoto, Jun
• Granted Patent: US 6,859,243 B2
• Time in Patent Office: Days
• US Class Current: 430/7
• 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 color filter comprising 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 0.730≦

z≦

0.810.

3. A color filter according to claim 1 or 2, wherein the chromaticity coordinates (x, y) in the XYZ calorimetric 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.

4. A color filter according to claim 3, further comprising red dots, 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.

5. A color filter according to claim 4, further comprising green dots, wherein the chromaticity coordinates (x, y) in the XYZ calorimetric system of the green dots, measured with CIE standard light source C, satisfy the expressions 0.22≦

x≦

0.34 and 0.56≦

y≦

0.65.

2. A color filter comprising blue dots containing Pigment Blue 15:

6 (PB15;

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

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

z≦

0.81.

6. 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 the expressions 0.265≦

x≦

0.29 and 0.24 5≦

y≦

0.30.

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

8. A liquid crystal display device according to claim 7, wherein the chromaticity coordinates (x, y) in the XYZ colorimetric system of the green dots, measured with CIE standard light source C, satisfy the expressions 0.22≦

x≦

0.34 and 0.56≦

y≦

0.65.

9. A liquid crystal display device according to claim 6, 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>

−

1087023z⁴+3205105z³−

3545958z²+1744329z−

321773 and 0.73≦

z≦

0.81.

10. A liquid crystal display device according to claim 6, 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 chromaticity coordinate z in the XYZ calorimetric system of the blue dots, measured with CIE standard light source C, satisfies 0.73≦

z≦

0.81.

11. A liquid crystal display device according to claim 6, wherein the color temperature of the white color displayed thereby is in the range of 9000 to 11000 K.