JPS5913219A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent coloring occuring in the deviation of the circumference in a display part, a color deviation, the difference in depth, and retardation, by using an org. film provided with polarization characteristic for the central substrate of a GH cell having a double-layered construction. CONSTITUTION:An org. film is a polyester film, and In2O3 is formed as a transparent electrode by cold sputtering on the surface thereof. The film to be placed at the center and to be provided with polarization characteristic is the flim contg. a dichromatic dye and is stretched or the PVC film which is impregnated with iodine and is laminated thereon with a polyester film is used. Org. films are used for the three sheets of the substrates except the one sheet 11. Since two sheets of the polarization plates are provided at the intermediate of the liquid crystal layers, the retardation for diagonal incident light is averted and since a reflection film 9 is coated on the substrate 13', the reflective display free from parallax is realized.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to the production of dichroic dyes by controlling liquid crystal alignment by applying an electric field to three pairs facing each other with a gap between them. We have developed a so-called guest-host type color display that displays by utilizing changes in the light absorption spectrum of the liquid crystal layer that occur as a result of changing the arrangement of molecules and changing the angle between the long axis of dye molecules and the vibration direction of incident and polarized light. This is related.

In this invention as shown in No. 5, the liquid crystal layers disposed on both sides of the inner insulating substrate are laminated with different light absorption spectra of the diatonic dyes contained in each layer. [Technical Background of the Invention] The structure of a conventional two-layer guest-host color liquid crystal display is shown in a cross-sectional view. Three glass substrates 01J1 (121
The residences are arranged downward in order with opposing gaps.

Each gap is sequentially filled with liquid crystal layers (7) and (8).

In the illustrated example, both substrates on the outside of this stack have a series of transparent electrodes f2D, t22) on each inside, and the substrate in the middle has transparent electrodes f231, 04) and 0 separated on both sides.
55c! It has Q. The liquid crystal layer (7) consists of liquid crystal molecules (
Dichroic dye molecules (4) are mixed into 3), and a liquid crystal layer (8) is mixed with dichroic dye molecules (4).
) is a liquid crystal molecule (3) mixed with another dichroic dye molecule (5). The liquid crystal molecules and the dichroic dye molecules are aligned parallel to each other on the surface of the glass substrate. Further, a polarizing plate (6) whose polarization axis is arranged parallel to the dichroic dye molecules is attached to the substrate (1).
It is placed on the outside of Tao. Dichroic dye molecules (41, (5
1 have different light absorption spectra, therefore, this laminate exhibits a color determined by the combined light absorption spectrum of 1 and 1 when no voltage is applied, and when a voltage is applied to the liquid crystal layer (8), the laminate exhibits a color determined by the combined light absorption spectrum of 1 and 1. Since the layer (8) is colorless and transparent, it exhibits a color determined by the dichroic dye molecules (4) contained in the liquid crystal layer (7). When a voltage is applied to the liquid crystal layer (7), it similarly exhibits a color determined by the dichroic molecules (5). In this way, the dual-layer color liquid crystal display allows color switching.

[Problems with background technology]

In such a two-layer color liquid crystal display, when light is projected as shown by the arrow, the glass substrate (11) is thick, so when viewed from an angle, both liquid crystal layers ('II, (8) When a voltage is applied, a shift occurs around the display part; when a voltage is applied to the liquid crystal layer (7) and when a voltage is applied to the liquid crystal layer (8), a difference in the depth of the display source occurs;
Also, there is a drawback that the color around the display part may be different from the center of the display part due to the misalignment of the height.

Furthermore, when a voltage is applied to the liquid crystal layer (8) but not to the liquid crystal layer (7), when viewed from an angle, the light that passes through the polarizing plate (6) on the line side is retardated by the liquid crystal layer (8). After passing through the liquid crystal layer (7), a coloring phenomenon occurs due to interference. This results in a serious disadvantage of deteriorating color purity. In particular, when adopting a reflective configuration, these drawbacks are doubled and become a major obstacle in practical use.

[Purpose of the invention]

The object of the present invention is to eliminate these drawbacks and provide an improved color liquid crystal display.

[Summary of the invention]

That is, in order to eliminate the above-mentioned drawbacks, the present invention provides a substrate with a film thickness of ~0.
It uses an organic film, and in particular, the substrate occupying the center has polarization properties by mixing dichroic dye molecules in a certain direction during the manufacturing process. The present invention provides a new color liquid crystal display that has been modified to eliminate the need for a polarizing plate placed on the front panel. Furthermore, one of the outer substrates may likewise consist of an organic film, and this film may be reflective.

[Embodiments of the invention]

Next, an embodiment of the present invention will be described. The durable organic film was a polyester film, on the surface of which I'n tOs was desirably formed as a transparent electrode by sputtering with Coal 1. In addition, dichroic knitting material is especially mixed into the one placed in the center □ to give it polarizing properties, and this film is stretched in a predetermined direction □.As a result, the orientation of the dichroic dye molecules is aligned. It's a shame. Alternatively, a film obtained by laminating a normal iodine-impregnated PTA film with a polyester film or the like may be used instead.

Fig. 2 is a cross-sectional view of a two-layer type host color liquid crystal display constructed using these films in the outer -□ direction Oj and the center (14). One of them (1 and 11) is made of glass. This is to keep the cell thickness uniform, and if you use spacers, cell manufacturing jigs, etc., all three plates can be made of film. It is also possible to do this □.The center occupies the center (the substrate is a unipolar substrate and at the same time has the function of a polarizing plate, so by positioning the polarizing plate between the two liquid crystal layers, Retardation phenomenon due to obliquely incident light can be avoided □.Both substrates ++, 4. o, 4 both have a thickness of 0.
Since the film is 1111 m long, the two liquid crystal layers can be placed close to each other, and the parallax in the display described above can be eliminated.

FIG. 3 shows the configuration of a reflective type. In this example, the board ++,
4 has a reflective film (9) coated on its outer surface.

This reflective film is a thin coating of white powder pigment or resin mixed with metal particles. Or the board (
131 itself may be mixed with a white pigment to impart reflectivity. In this way, a reflective liquid crystal display is obtained which is sufficiently practical and capable of color switching.

〔Effect of the invention〕

As described above, when a two-layer guest-host color liquid crystal display is used to be viewed from an oblique direction, color purity decreases due to tarpaulin in the liquid crystal, display irregularities occur, and the periphery of the display area. This overcomes the conventional drawbacks such as color change and realizes a more practical display. Also, since it uses a structure in which three insulating substrates are stacked, the structure is simpler than a structure in which one polarizing plate is simply placed between two guest-host liquid crystal panels, and the spacing between the two liquid crystal layers can be reduced. This shortens the display area to reduce misalignment of the display. Since there is no need for an adhesive layer to bond the polarizing plate and the glass substrate, it has the advantage of not generating bubbles or peeling off from the surroundings due to heat effects after assembly, improving reliability. Further, the central insulating substrate is in the form of a film and has flexibility, which has the advantage of equalizing the internal pressure of the liquid crystal layer and equalizing the thickness of the two liquid crystal layers. Especially considering that the above-mentioned disadvantages are more pronounced when a reflective type liquid crystal display is used, it is a great convenience to be able to produce a reflective type color-switchable liquid crystal display according to the present invention.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional two-layer guest-host color liquid crystal display, and FIGS. 2 and 3 are cross-sectional views of a two-layer guest-host color liquid crystal display according to the present invention. In Figures 2 and 3, (ill...Glass substrate G111. ca, CI! 31. (2, a, as
, (261...Transparent electrode (3)...Liquid crystal molecules (4), (5)...Dichroic dye molecules (71, (8)...Liquid crystal layer a5...Substrate film 0 occupying the center City...Substrate film occupying the outside (9)...Reflective thin film Agent Patent attorney Inoue - Male Figure 1 Figure 3 Figure ω

Claims (2)

[Claims] (1) Two liquid crystal layers, each made by individually mixing nematic liquid crystal with one or the other dichroic dye having a different light absorption spectrum, are sandwiched between three opposing insulating substrates with a gap between them. In a color liquid crystal display, which performs display by electro-optically changing the liquid crystal layer by applying voltage between transparent electrodes formed on each surface of the substrates sandwiching the layers, the center of one or three insulating substrates is 1. A color liquid crystal display device, wherein the substrate is made of an organic film and has polarizing properties. (2) The color described in Paragraph (1) I of the patent claim, characterized in that one of the outer insulating substrates is made of an organic film and has a light reflecting function. LCD display.