JPS58194971A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To make pure black color display possible, by using a liquid crystal blended with a composition prepared by adding specified anthraquinone dye compds. to a conventional dichroic dye mixture compsn. for black color display. CONSTITUTION:Dye compds. of the formula (wherein m, l are each an integer of 1 or greater; m, n are each 0 or an integer of 1 or greater) and having an absorption maximum in the visible light region above 660mmu are used. For example, a plurality of the above dye compds. are added to a conventional dichroic dye mixture compsn. having light absorption characteristics represented by dotted line (b) for black color display to form a compsn. having light absorption characteristics represented by solid line (a). The compsn. is blended with a liquid crystal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a color liquid crystal display device using a black liquid crystal material containing a dichroic dye mixture composition.

[Prior art and its problems]

A liquid crystal display device using a black liquid crystal material in which a dichroic dye mixture composition is dissolved can perform color switching by applying voltage. General C- Well known because of the F sign. In the color liquid crystal display device 11 to which the method 12 is applied, the displayed color and its q* are almost determined by the dye C of the dichroic dye mixture composition dissolved in the liquid crystal C.

As is clear from the above, since the color tone and sharpness of the display are determined by the dichroic dye mixture composition, a pure island color is particularly preferable as the dye used for this type of display. In this case, the previously known dye Tojisen cannot produce a pure black display as a single dye, so it is currently being reluctantly mixed and combined with yellow, red, and blue dyes. The Hibiki 2 is configured so that a black display is produced by the C2. However, when using liquid crystal materials for thermal color display using the above-mentioned mixed combinations, it is difficult to display pure black, and the display contains other visible light, which often lacks clarity. Since there are 4112 red display components, it is necessary to improve the visibility by removing or reducing this component.

[Purpose of the invention]

The present invention provides a color liquid crystal display using a liquid crystal material that uses the dichroic dye mixture composition described above, reduces the red display component generated by this composition and that tends to negate the purpose of the present invention, and provides a pure black display. The purpose is to provide equipment.

[Summary of the invention]

The present invention is a color liquid crystal display device having a liquid crystal material that uses a dichroic dye mixture composition to make it possible to display nearly one color. It is characterized by absorbing as much as possible the red component of 6601 or more among the visible light display components accompanying the mixing of the dye mixture, and sufficiently suppressing the appearance of this red component. When mixed in various ways, ■ - Therefore, it becomes a black light or black color.Next 12.660m of the above dyes.
11 things that have the maximum absorption ability in the visible nine ranges above μ
It is a mixture of one or more types. For example, by mixing one anthraquinone dichroic dye having an absorption maximum of 682 mμ with a conventionally known dichroic dye composition I: Therefore, it is possible to absorb components such as red light. or depending on the application, if red light components are not desired, it is possible to mix multiple types of dichroic dyes with an absorption maximum of 660 mμ or more and have the ability to absorb red light components. A mixed dye capable of displaying black color is obtained. This is because dichroic dyes that have the ability to absorb in this type of wavelength range have difficulty in solubility with liquid crystals (their solubility is extremely low). Intended for substances that have maximum absorption in -:1:・□'t'-Use two or more types.・
By (11) (this is one feature of the present invention), sufficient absorption capacity can be exhibited.

Therefore, it is preferable to use two or more dichroic dyes having absorption maximums in the visible light range of 660 m or more. For example, four types of anthraquinone-based dyes having a maximum absorption wavelength of 682.683.686.691 mμ according to the present invention shown in Table 1 are mixed, and this mixed dye is mixed with another dichroic dye mixture composition C. By mixing two liquids and dissolving them into liquid crystal, a black liquid crystal material is formed.1.The ability to exhibit pure black color2-
It is possible to obtain a liquid crystal device.

Figure 1 shows the light absorption curve (b
), and an anthraquinone thread dye having a maximum absorption wavelength of about 682.683.686.691 mμ is mixed with this dichromatic dye mixture composition to produce liquid crystal g; the present invention made using the dissolved liquid crystal material. The light absorption curve of a 1U color liquid crystal device is shown in (a).

It is clear from this figure that in the color liquid crystal display C according to the present invention, there is a significant difference in the visible light range with a wavelength range of 660 mμ or more, and the light absorption of the red component is extremely large. it is obvious. Pure black display can be realized from this i2.

Table IFi, the present invention In, the wavelength absorption maximum is 660 mμ
The above visible light range I: shows a specific example of a certain dichroic dye.

〔Effect of the invention〕

As is clear from the above and the characteristic curves (,) in Figure @1, using the mixture of dichromatic dyes according to the present invention allows the black color to appear without C2, and to improve the purity of the black color. It has the characteristic that it can reduce the colors that appear in other colors, especially the egg color component, which is currently considered a problem, to the extent that it is almost invisible to the naked eye.

Therefore, if a liquid crystal device is formed using a black liquid crystal material in which such a dye is mixed in a transparent manner, an extremely clear display can be obtained.

[Embodiments of the invention]

The liquid crystal is phenylcyclohexane-based zL Any 694 (
(manufactured by Merck & Co.), a dichromatic dye mixture (azo and anthraquinone), and finally dye A (Table 1), which has a wavelength absorption maximum of about 682 mμ, and 5, which also has a wavelength absorption maximum of about 68 mμ.
DIJ4 □ material (Table 1), which has two 3m C, and the same 1 (686 mμ゛2? dye) (Table ,5
A liquid crystal material for black display was formed by mixing the liquid crystal materials one by one, and a color liquid crystal display device was constructed using this liquid crystal material. The display wavelength characteristic of this display device is Ca as shown in C above.
It shows an absorption spectrum equivalent to curve (a) in Figure 1, and because it efficiently absorbed the red luminescent component, which is a particular problem, there is almost no red display wavelength range, and it is hardly noticeable to the eye. This means that a pure ripe color has appeared.

Also, among the dichroic dyes mentioned above, the use of a large number of dyes with large absorption wavelengths of 660 mμ or more has two special effects.
As mentioned above, it is possible to increase the effect even by increasing the number of types.

Note that the objects of the present invention can be achieved by any combination of the dichroic dyes in Table 1. Therefore, it is a good idea to limit the amount and mix various ingredients. This is because this type of dye has a solubility problem for liquid crystal C2 (however, Table 1.
:□1: Kasumi dye has relatively better solubility than known dyes), poly1:i
This is because if the dyes are used in the same manner, each dye can be adsorbed in the required mixing amount, so that a sufficient amount of external absorption can be maintained, and efficiency is improved.

Although some of the dichroic dye mixture compositions have been described in the above examples, the combinations thereof are free, and the dichroic dye composition according to the present invention is not limited to those shown in Table 1. The same applies to C2 liquid crystal materials. Phenylcyclohexane liquid crystal 1: Examples include, but are not limited to, biphenyl liquid crystal, phenylcyclohexanoate liquid crystal, phenylbenzoate liquid crystal, Schiff base liquid crystal, pyrimidine liquid crystal, and oxazole. A plurality of types of liquid crystals may be used.

[Brief explanation of drawings]

Figure 1 is the ninth explanatory diagram explaining the iron absorption spectrum in the visible light range of the liquid crystal material according to the present invention. Written by Mr. Nagagi of the Japan Patent Office■ Display color liquid crystal display device 3 of the case, relationship with the case by the person making the amendment Patent applicant (307) jl Tokyo Shiba 4!Ki Co., Ltd. Tokyo office, 1-1-6 Uchisaiwai-cho, 4-ku 1, Column 2 of @- in the 4th request for permission in the specification, 6 next to the detailed description of the invention in document i Contents of the amendment (υ The general chemical structural formula stated on page 6, line 5 of the specification is amended as follows: Table 1 General chemical structural formula % Formula % Claim 11) Black liquid crystal having a dichroic dye mixture composition A color liquid crystal display device using a material containing a dye having the following chemical structural formula having a wavelength absorption maximum in the visible light region of 660 mμ or more as a component of the dichroic dye mixture composition. Display device.However, n, an integer m where l>t, an integer where x>l, or zero (2) In the claim described in item 1, as a component of the dichroic dye mixture composition, the maximum wavelength absorption is 660 mμ A color liquid crystal display device containing at least two kinds of dyes in the visible light range as described above.

Claims (1)

[Claims] (1) Considering a color liquid crystal display device using a black liquid crystal material having a dichroic dye mixture composition; where, as a component of the dichroic dye mixture composition, the visible light region I whose wavelength absorption maximum is 660 mμ or more is used. : A color liquid crystal display device characterized by having 5 dyes having the following chemical structural formula, n, j) an integer m of 1, s) an integer of 1 or zero (a patent claim described in item 2141) In the range g2, the wavelength absorption maximum is 660 mμ as a component of the dichroic dye mixed composition.
A color liquid crystal display device comprising at least two or more dyes in the above visible light range.