Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube
Reexamination Certificate
1999-06-15
2001-05-29
McPherson, John A. (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Screen other than for cathode-ray tube
C349S106000, C347S107000, C359S891000
Reexamination Certificate
active
06238827
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a color filter employed for a color display apparatus or the like. In particular, the present invention relates to a color filter preferable to a color television, an on-vehicle television, a personal computer, a pinball game machine board or the like, and further, a liquid crystal element using the color filter.
2. Related Background Art
A color display apparatus is configured by a light shutter and a back light represented by a color filter and a liquid crystal, and visualizes modulated light by display information. A color to be displayed is produced by attenuating unnecessary wavelength area of the back light in order to synthesize spectra by means of the color filter and the light shutter. The color filter utilizes wavelength area of a dye or a pigment. However, since transmission spectra are broad, color reproducibility with a high color purity is difficult. When the color purity is increased by concentrating the dye or pigment, the brightness of the transmitted light through the color filter is attenuated. As a result, the display is darkened, thereby making it difficult to visualize tone representation at a level close to a black. Therefore, countermeasures are taken, for example, by increasing luminance of the back light. If the luminance of the back light is increased, power consumption increases. Such increased power consumption is disadvantageous in a personal computer of notebook type, which is the main stream of a color display apparatus.
SUMMARY OF THE INVENTION
The present invention has been achieved in view of the foregoing problem. It is one object of the present invention to provide a color filter with a high color density and a superior transparency.
It is another object of the present invention to provide a liquid crystal display panel capable of displaying a high quality image such that a tone representation close to a black can be clearly visualized without increasing the luminance of back light, for example.
It is still another object of the present invention to provide a computer comprising a high quality image display section.
It is still another object of the present invention to provide a method for manufacturing a color filter with a high color density and a superior transparency.
A color filter capable of achieving the above mentioned objects is a color filter comprising red, green, and blue color elements, wherein a relationship between a tri-stimulus value (Y) of a white color synthesized by the color elements and an area (S) for a triangle formed by connecting an xy chromaticity coordinate in a standard C light source of the above color elements obtained based on a XYZ color system with a 2° visual field (JIS Z8701) meets Y≧−255*S+54.
In particular, in the case where the red color element includes at least one color element selected from coloring matters indicated by the following structural formulas (R1-1), (R1-2), (R2-1), and (R2-2), the above green color element includes at least one color element selected from a phthalocyanine dye indicated by the following structural formula (G1), a phthalocyanine dye indicated by (G2), a naphthalocyanine dye indicated by (G3), and a pyrazolone dye indicated by (G4), and the above blue color element is configured so as to include at least one clolring matter selected from a porphyradine dye indicated by the following structural formula (B1) and a phthalocyanine dye indicated by (B2); a color filter obtained therewith can satisfy properties of color density and transparency, which are likely to conflict with each other, at a very high level.
(In the above general formula (R1-1), R
1
, R
2
, R
3
, and R
4
each denote a hydrogen atom, a halogen atom, a nitro group, an alkyl group with 1 to 5 carbons, a CF
3
group or SO
3
(M1) group (M1 indicates a monovalent alkaline metal cation or NH
4
), R
5
and R
6
each denote a hydrogen atom, a halogen atom, or a SO
3
(M2) group (M2 indicates a monovalent alkaline metal or NH
4
), M3 denotes Cr, Ni, or Co, and X1
+
denotes a monovalent metal cation or NH
4
+
).
(In the above general formula (R1-2), R
7
and R
8
each denote a hydrogen atom, a halogen atom, a nitro group, an alkyl group with 1 to 5 carbons, a CF
3
group, or SO
3
(M1) group (M1 indicates a monovalent alkaline metal or NH
4
), R
9
denotes a hydrogen atom, a halogen atom or a SO
3
(M2) group (M2 indicates a monovalent alkaline metal or NH
4
), M4 denotes Cu or Cr, and X2
+
denotes a monovalent alkaline metal cation or NH
4
+
.)
(In the above formula (R2-1), X3 to X6 each denotes a halogen atom, Z1 denotes a —COO (M3) group or a —SO
3
−
group, and M3 denotes a monovalent alkaline metal or NH4
+
.)
(In the above formula (R2-2), R
10
and R
11
each denote a hydrogen atom, a linear or branched alkyl group with 1 to 5 carbons or a substituted or unsubstituted aryl group, Z2 and Z3 each denote a —COO (M4) group or a —SO
3
−
group, and M4 denotes a monovalent alkaline metal or NH
4
+
.)
(In the above formula (G1), Pc indicates a phthalocyanine backbone, (M7) indicates Cu, Zn, or Ni, R
12
and R
13
each indicate a hydrogen atom, SO
3
(M5), a substituted or unsubstituted amide group, or a substituted or unsubstituted alkyl group. R
14
and R
15
each indicate a substituted or unsubstituted alkyl group, R
16
indicates —CONHR
17
, —COOH or —COO (M6), R
17
indicates a hydrogen atom or a substituted or unsubstituted alkyl group. In addition, n indicates 0, 1, or 2. M5, M6, and M8 each indicate an alkaline metal or NH4
+
.)
(In the above formula (G2), Met denotes a divalent to tetravalent metal ion or two hydrogen atoms, RPc denotes a phthalocyanine residue into which 1 to 8 phenyl groups are introduced, M9 denotes a hydrogen atom, an alkaline metal, or an ammonium ion, x denotes 1 to 8, y denotes 0 to 7 (provided that x+y<8), and when Met denotes a trivalent or tetravalent metal ion, one or two ligands exist, respectively.)
(In the above formula (G3), Met denotes a divalent to tetravalent metal ion or two hydrogen atoms, NPc denotes a naphthalocyanine residue, M10 denotes a hydrogen atom, an alkaline metal, or an ammonium ion, x denotes 1 to 4, y denotes 0 to 3 (provided that x+y≦4), and when Met denotes a trivalent or tetravalent metal ion, one or two ligands exist, respectively.)
(In the above formula (G4), R
18
and R
19
each independently indicate a hydrogen atom, a OH group, a halogen atom, a linear or branched alkyl group with 1 to 5 carbons, a nitro group, a CF
3
group, or a SO
3
(M11) group (M11 denotes a monovalent alkaline metal or NH
4
). R
20
and R
21
both indicate SO
3
(M12) groups (M12 denotes a monovalent alkaline metal or NH
4
).
m denotes an integer of 1 to 4,
n denotes an integer of 0 to 3, and
m+n denotes an integer of 1 to 4.
(In the above formula (B1), A
1
to A
4
each independently denotes an aromatic ring that may be substituted by a halogen atom, a nitro group, an alkyl group, an aryl group, an alkoxy group, sulfone group, or sulfoamide group; or a nitrogen-containing heteroaromatic ring that may be substituted by a sulfone group or a sulfoamido group, and at least one of A
1
to A
4
is a nitrogen-containing heterocyclic ring. M13 denotes two hydrogen atoms or a divalent metal, or a trivalent or tetravalent metal derivative, and D denotes a monovalent alkaline metal or NH
4
.)
(In the above formula (B2), m and n each denote the number of substituents, D independently denotes an alkaline metal or ammonia, M14 denotes two hydrogen atoms or a divalent metal having a substituent, or a trivalent or tetravalent metal derivative.)
In addition, a liquid crystal display panel capable of achieving the foregoing objects comprises a color filter comprising red, green, and blue color elements in which a relationship between the tri-stimulus value (Y) of a white color synthesized by the color element and an area (S) for a triangle formed by connecting an xy chromaticity coordinate in a standard C light sourc
Hirose Masashi
Kashiwazaki Akio
Miyazaki Takeshi
Nakazawa Koichiro
Shirota Katsuhiro
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
McPherson John A.
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