Colored composition for color filter and display using color filters formed of the colored composition
AssigneeHitachi Displays, Ltd.
InventorsKotaro Araya, Hiroshi Sasaki, Yasushi Tomioka
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Abstract
An object of the present invention is to obtain color filters having a high contrast, a high color purity and an improved transmittance for blue color, and a display using the color filters. In the present invention, there is used a colored composition for color filter comprising at least one coloring agent, a base polymer and at least one solvent, said base polymer containing a polyamicacid whose light transmittance decreases by 2% or less in the visible region (wavelength: 400 nm to 800 nm).
Claims8
A colored composition for color filter comprising a base polymer containing a polyamicacid whose light transmittance decreases by 2% or less in the visible region (wavelength:
- 400 nm to 800 nm), at least one coloring agent and at least one solvent, wherein a pigment derivative having a structure represented by the following general formula (I) is used as said coloring agent:
- A(B)x(C)y (I)
- wherein x is a number of 1 to 4;
- y is a number of 0 to 8, and x+y is greater than or equal to 1;
- A is a coloring group derived from quinacridone, anthraquinone, perylene, indigo, quinophthalone, isoindolinone, isoindoline, dioxazine or diketopyrrolopyrrole;
- B is a substituent bonded to a nitrogen atom contained in A, by the formation of a carbamate, namely, B is represented by the following structural formula (1):
- wherein R1 is
- and substituted aryl groups;
- and C is a side chain group bonded to an aromatic ring contained in A and is selected from halogen atoms, cyano group, alkyl groups (—(CH2)nCH3 wherein n is an integer of 0 to 20), alkoxyl groups (—O—(CH2)mCH3 wherein m is an integer of 0 to 20) and oxymethylene groups (—O—(CH2—O)kCH3 wherein k is an integer of 0 to 20), and of these, the alkyl groups and the alkoxyl groups may contain a functional group for polymerization and addition.
A colored composition for color filter comprising a base polymer containing a polyamicacid whose light transmittance decreases by 2% or less in the visible region (wavelength:
- 400 nm to 800 nm), at least one coloring agent and at least one solvent, wherein a phthalocyanine derivative having a structure represented by the following general formula (II) is used as said coloring agent:
- Pc(M)(C)y(D)z (11)
- wherein y is a number of 0 to 16;
- z is a number of 1 to 2, and y+z is greater than or equal to 1;
- Pc is phthalocyanine;
- M is H2, Ni, Zn, Cu, Fe, V, Ti, Si or Ge;
- C is a side chain group bonded to an aromatic ring contained in Pc and is selected from chlorine atom, alkyl groups (—(CH2)nCH3 wherein n is an integer of 0 to 20), alkoxyl groups (—O—(CH2)mCH3, wherein m is an integer of 0 to 20), oxymethylene group s (—O—(CH2—O)kCH3 wherein k is an integer of 0 to 20) and alkoxysilane residues (—Si(—O—(CH2)mCH3 wherein m is an integer of 0 to 20), and of these, the alkyl group and the alkoxyl group may contain a functional group for polymerization and addition;
- and D is a substituent bonded to M and having an oxygen atom as a spacer, namely, D is represented by the following structural formula (2):
Dependencies are inferred from the claim text.