Color filter, liquid crystal display panel, computer, and method for manufacturing color filter

• US 6,238,827 B1
• Filed: 06/15/1999
• Issued: 05/29/2001
• Est. Priority Date: 06/18/1998
• Status: Expired due to Term

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Hirose, Masashi, Kashiwazaki, Akio, Nakazawa, Koichiro, Miyazaki, Takeshi, Shirota, Katsuhiro
• Primary Examiner(s): McPherson, John A.
• Application Number:
  US09/333,041
• Time in Patent Office: 714 Days
• Field of Search: 430/7, 349/106, 347/106, 347/107, 359/891
• US Class Current: 430/7
• CPC Class Codes: C09B 67/0033 Blends of pigments; Mixtured crystals; Solid solutions
• CPC Class Codes: C09D 11/328 characterised by dyes
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: G02B 5/22 Absorbing filters G02B5/201 - G02B5/208 take precedence
• CPC Class Codes: G02F 1/133516 Methods for their manufacture, e.g. printing, electro-deposition or photolithography

Abstract

It is an object of the present invention to provide a color filter with high color density and superior transparency. The color filter comprises red, green, and blue color elements. A relationship between a tristimulus value (Y) of a white color synthesized by the color elements and an area (S) for a triangle formed by connecting the xy chromaticity in the standard C light source of the above color elements each obtained based on a XYZ color system with a 2° visual field (JIS Z8701) meets the condition of Y≧−255*S+54.

Claims

1. A color filter comprising red, green, and blue color elements, wherein a relationship between a tristimulus value (Y) of a white color synthesized by the color elements and an area (S) for a triangle formed by connecting the xy chromaticity in a standard C light source of said color elements each obtained based on a XYZ color system with a 2°

visual field (JIS Z8701) meets Y≧

−

255*S+54.

2. The color filter as claimed in claim 1, wherein said relationship between Y and S meets Y≧

−

255*S+54.5.

3. The color filter as claimed in claim 2, wherein said relationship between Y and S meets Y≧

−

255*S+55.

4. The color filter as claimed in claim 3, wherein said relationship between Y and S meets Y≧

−

255*S+55.5.

5. The color filer as claimed in claim 4, wherein said relationship between Y and S meets Y≧

−

255*S+56.

6. The color filter as claimed in claim 1, wherein the color elements each include a dye.

7. The color filter as claimed in claim 1, wherein said red color element includes at least one coloring matter of structural formulae (R1-1), (R1-2), (R2-1), or (R2-2):

wherein R₁, R₂, R₃, and R₄ independently denote a hydrogen atom, a halogen atom, a nitro group, a C_1-5, alkyl group, CF₃, or SO₃(M1) (where M1 indicates a monovalent alkaline metal or NH₄⁺);

R₅ and R₆ independently denote a hydrogen atom, a halogen atom or SO₃(M1);

M3 denotes Cr, Ni, or Co; and

X1⁺ denotes a monovalent alkaline metal cation or NH₄⁺;

wherein R₇ and R₈ independently denote a hydrogen atom, a halogen atom, a nitro group, a C_1-5 alkyl group, CF₃, or a SO₃(M1);

R₉ denotes a hydrogen atom, a halogen atom, or SO₃(M1);

M4 denotes Cu or Cr; and

X2⁺ denotes a monovalent alkaline metal cation or NH₄⁺;

wherein X₃ to X₆ independently denote a halogen atom;

Z1 denotes —

COO(M1) or —

SO₃⁻

;

wherein R₁₀ and R₁₁ independently denote a hydrogen atom, a linear or branched C_1-5 alkyl group, or a substituted or unsubstituted aryl group; and

Z2 and Z3 independently denote —

COO(M1) or —

SO₃⁻

;

said green color element includes at least one coloring matter of structural formulae (G1), (G2), (G3), or (G4);

wherein Pc indicates a phthalocyanine backbone;

(M7) indicates Cu, Zn, or Ni;

R₁₂ and R₁₃ independently indicate a hydrogen atom, SO₃(M5), a substituted or unsubstituted amide group, or a substituted or unsubstituted alkyl group;

R₁₄ and R₁₅ independently indicate a substituted or unsubstituted alkyl group;

R₁₆ indicates —

CONHR₁₇, —

COOH, or —

COO(M6);

R₁₇ indicates a hydrogen atom or a substituted or unsubstituted alkyl group;

n indicates 0, 1, or 2; and

M5, M6, and M8 independently indicate a monovalent alkaline metal or NH₄⁺;

wherein Met denotes a divalent, trivalent or tetravalent metal ion, or two hydrogen atoms;

RPc denotes a phthalocyanine residue having 1 to 8 phenyl groups;

M9 denotes a hydrogen atom, an alkaline metal, or ammonium ion; and

x denotes an integer of 1 to 8 and y denotes an integer of 0 to 7 (with the provisos that x+y<

8 and when Met denotes a trivalent or tetravalent metal ion, then one or two ligands exist, respectively);

wherein Npc denotes a naphthalocyanine residue;

M10 denotes a hydrogen atom, an alkaline metal, or an ammonium ion;

x denotes an integer of 1 to 4 and y denotes an integer of 0 to 3 (with the provisos that x+y≧

4 and when Met denotes a trivalent or tetravalent metal ion, then one or two ligands exist, respectively);

wherein R₁₈ and R₁₉ independently indicate a hydrogen atom, a OH group, a halogen atom, a linear or branched C_1-5 alkyl group, a nitro group, CF₃, SO₃(M1); and

R₂₀ and R₂₁ independently indicate a SO₃(M1); and

said blue color element includes at least one coloring matter of formulae (B1) or (B2);

wherein m denotes an integer of 1 to 4 and n denotes an integer of 0 to 3 (with the proviso that m+n denotes an integer of 1 to

     4);

A₁ to A₄ independently denote an aromatic ring that may be substituted by a halogen atom, a nitro group, an alkyl group, an aryl group, an alkoxy group, a sulfonic group, or a sulfonamide group;

or a nitrogen-containing heteroaromatic ring that may be substituted by a sulfonic group or a sulfoamide group (with the proviso that at least one of A₁ to A₄ denotes a nitrogen-containing heterocycle);

M13 denotes two hydrogen atoms, a divalent metal, or a trivalent or tetravalent metal derivative; and

D denotes a monovalent alkaline metal or NH₄; and

wherein m and n are integers such that 1<

m<

4 and 0<

n<

3 (with the proviso that 1<

m+n<

4);

D independently denotes an alkaline metal or ammonium; and

M14 denotes two hydrogen atoms or a divalent metal having a substituent, or a trivalent or tetravalent metal derivative.

8. A method for manufacturing a color filter according to claim 7, comprising the steps of:

selecting as said red, green and blue coloring matters inks which are suitable for ink jet recording; and

ejecting each color ink toward a surface of a light-transmissible substrate using the ink jet process at predetermined positions on the substrate, wherein

the red, green, and blue color elements are formed on the light-transmissible substrate to have a relationship between a tristimulus value (Y) of a white color synthesized by the red, green, and blue color elements and an area (S) for a triangle formed by connecting the xy chromaticity coordinate in a standard C light source of the above color elements each obtained based on a XYZ color system with a 2°

visual field (JIS

     28701) satisfies the relationship Y>

−

255*S+54.

9. A liquid crystal display panel comprising:

a color filter having red, green, and blue color elements, the color filter ensuring that a relationship between a tristimulus value (Y) of a white color synthesized by the color elements and an area (S) for a triangle formed by connecting the xy chromaticity coordinate in a standard C light source of said each color element obtained based on a XYZ color system with a 2°

visual field (JIS Z8701) meets Y≧

−

255*S+54; and

a panel substrate disposed opposite to the color filter, a liquid crystal compound being sealed between the color filter and the panel substrate.

10. The liquid crystal display panel as claimed in claim 9, wherein said relationship between Y and S meets the condition of Y≧

−

255*S+54.5.

11. The liquid crystal display panel as claimed in claim 10, wherein said relationship between Y and S meets the condition of Y≧

−

255*S+55.

12. The liquid crystal display panel as claimed in claim 11, wherein said relationship between Y and S meets the condition of Y≧

−

255*S+55.5.

13. The liquid crystal display panel as claimed in claim 12, wherein said relationship between Y and S meets the condition of Y≧

−

255*S+56.

14. The liquid crystal display panel as claimed in claim 9, wherein the color elements each include a dye.

15. The liquid crystal display panel as claimed in claim 9, wherein said red color element includes at least one coloring matter of structural formulae (R1-1) or (R1-2) and at least one coloring matter of structural formulae (R2-1) or (R2-2):

wherein R₁, R₂, R₃, and R₄ independently denote a hydrogen atom, a halogen atom, a nitro group, a C_1-5 alkyl group, CF₃, or SO₃(M1) group (wherein M1 indicates a monovalent alkaline metal or NH₄);

R₅ and R₆ independently denote a hydrogen atom, a halogen atom, or SO₃(M1);

M3 denotes Cr, Ni, or Co; and

X1⁺ denotes a monovalent alkaline metal cation or NH₄⁺;

wherein R₇ and R₈ independently denote a hydrogen atom, a halogen atom, a nitro group, a C_1-5 alkyl group, CF₃, or SO₃(M1);

R₉ denotes a hydrogen atom, a halogen atom, or SO₃(M1);

M4 denotes Cu or Cr; and

X2⁺ denotes a monovalent alkaline metal cation or NH₄⁺;

wherein X₃ to X₆ independently denote a halogen atom; and

Z1 denotes —

COO(M1) or a —

SO₃⁻

group; and

wherein R₁₀ and R₁₁ independently denote a halogen atom, a linear or branched C_1-5 alkyl group;

or a substituted or unsubstituted aryl group; and

Z2 and Z3 independently denote a —

COO(M1) or a —

SO₃⁻

group;

said green color element includes at least one coloring matter of structural formulae of (G1), (G2), (G3) or (G4);

wherein Pc indicates a phthalocyanine backbone;

(M7) indicates Cu, Zn, or Ni;

(M8) indicates a monovalent alkaline metal or NH₄⁺;

R₁₂ and R₁₃ independently indicate a hydrogen atom, SO₃(M1), a substituted or unsubstituted amide group, or a substituted or unsubstituted alkyl group;

R₁₄ and R₁₅ independently indicate a substituted or unsubstituted alkyl group;

R₁₆ indicates —

CONHR₁₇, —

COOH, or —

COO(M1);

R₁₇ indicates a hydrogen atom or a substituted or unsubstituted alkyl group; and

n indicates 0, 1, or 2;

wherein Met denotes a divalent, trivalent, or tetravalent metal ion, or two hydrogen atoms;

RPc denotes a phthalocyanine residue having 1 to 8 phenyl groups;

M9 denotes a hydrogen atom, an alkaline metal, or an ammonium ion; and

x denotes an integer of 1 to 8 and y denotes an integer of 0 to 7 (with the provisos that x+y<

8 and when Met denotes a trivalent or tetravalent metal ion, one or two ligands exist, respectively);

wherein Npc denotes a naphthalocyanine residue;

M10 denotes a hydrogen atom, an alkaline metal, or an ammonium ion; and

x denotes an integer of 1 to 4 and y denotes an integer of 0 to 3 (with the provisos that x+y≦

4 and when Met denotes a trivalent or tetravalent metal ion, one or two ligands exist, respectively); and

wherein R₁₈ and R₁₉ independently indicate a hydrogen atom, a OH group, a halogen atom, a linear or branched C_1-5 alkyl group, a nitro group, CF₃, a SO₃(M1); and

R₂₀ and R₂₁ independently denote SO₃(M1); and

said blue color element includes at least one coloring matter represented by formulae (B1) or (B2);

wherein m denotes an integer of 1 to 4 and n denotes an integer of 0 to 3 (with the proviso that m+n denotes an integer of 1 to

     4);

A₁ to A₄ independently denote an aromatic ring that may be substituted by a halogen atom, a nitro group, an alkyl group, an aryl group, an alkoxy group, a sulfonic group, or a sulfoamide group;

or a nitrogen-containing aromatic ring that may be substituted by a sulfonic group or a sulfoamide group (with the proviso that at least one of A₁ to A₄ denotes a nitrogen-containing heterocycle);

M13 denotes two hydrogen atoms or a divalent metal, or a trivalent or tetravalent metal derivative; and

D denotes a monovalent alkaline metal or NH₄; and

wherein m and n are integers such that 1<

m<

4 and 0<

n<

3 (with the proviso that 1<

m+n<

4);

D independently denotes an alkaline metal or ammonia; and

M14 denotes two hydrogen atoms or a divalent metal having a substituent, or a trivalent or tetravalent metal derivative.

16. The liquid crystal display panel as claimed in claim 9 comprising an electrode for controlling orientation of the liquid crystal compound on a face opposite to the side having the color elements of the light-transmissible substrate of the color filter.

17. A computer comprising a liquid crystal panel as claimed in any of claims 9 to 16 as an image display section.