JPH0527092B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device having a normal point pattern capable of displaying two colors.

[Conventional technology and problems]

Conventionally, in twisted nematic (hereinafter abbreviated as TN) guest-host type liquid crystal display devices containing dichroic dyes in the liquid crystal, when providing a constant point pattern for constant display in addition to the display pattern using transparent electrodes, , as shown in FIG.
After rubbing the two substrates 2 and 3 equipped with transparent electrodes, alignment films, etc. that make up the liquid crystal cell in the A and B directions perpendicularly to each other in the same way as a normal TN type liquid crystal display element, a regular point pattern 4 is formed. Using a rubbing mask having an opening corresponding to the shape of A regular point pattern with uniaxial orientation is formed on the substrates 2 and 3 thus formed, and polarizing plates 5 and 6 having polarization directions shown by arrows D and E are arranged so as to be parallel Nicols. As a result, a constant pattern was obtained.

However, in this configuration, the regular point pattern 4
Even if there are multiple (two in the illustrated case), the regular point patterns 4 all have the same orientation direction, so
Although the liquid crystal contains a dichroic dye, the display of the normal point pattern is limited to either the color display of the dichroic dye or the white display, and as for the normal point pattern, It was impossible to perform a two-color display.

[Purpose of the invention]

In view of the above points, it is an object of the present invention to provide a liquid crystal display device having a normal point pattern capable of displaying two colors.

[Means and actions for solving problems]

According to the present invention, the above object is achieved by rubbing two substrates constituting a liquid crystal cell in a direction perpendicular to each other so as to have a normal TN orientation, and corresponding to the first normal point pattern of one substrate. and the area corresponding to the second regular point pattern on the other substrate,
By rubbing each of the substrates again in a direction perpendicular to the rubbing direction, two uniaxially oriented regular point pattern regions perpendicular to each other are formed, and preferably a black mask including a predetermined regular point pattern shape is formed. Polarizing plates are arranged to face the first regular point pattern area, and are further arranged to face each other so as to sandwich the substrate in a parallel nicol state, and one of the regular point pattern areas A white display is achieved by a TN guest-host type liquid crystal display device having a normal point pattern, the other normal point pattern being configured to display the color of a dichroic dye.

According to this invention, the direction of uniaxial orientation of the regular point pattern area corresponding to the first regular point pattern and the regular point pattern area corresponding to the second regular point pattern is
Preferably, by using rubbing masks each having an opening, the rubbing is carried out so that they are perpendicular to each other, so that the alignment direction is perpendicular to the polarization direction of the polarizing plate, which is disposed so as to face the substrate in parallel Nicols. In the normal point pattern area, which has an alignment direction parallel to the polarization direction, a white display is performed that is not affected by the dichroic dye in the liquid crystal. The color display is performed under the influence of the dye, and thus it becomes possible to perform two-color display using the constant pattern in the TN guest-host liquid crystal display device.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of a liquid crystal display device according to the present invention, and in this liquid crystal display device 10,
Two substrates 11 and 12 constituting a TN (twisted nematic) guest-host type liquid crystal cell are arranged facing each other, and one substrate 11 has a display pattern section 11.
a and a regular point pattern section 11b, and the other substrate 12 includes a display pattern section 12a and a regular point pattern section 12b arranged so as not to overlap with the regular point pattern section 11b of the one substrate 11. There is.

The substrates 11 and 12 have their display pattern portions 1
After 1a and 12a are rubbed perpendicularly to each other in directions A and B, similarly to a normal TN type liquid crystal display element, the regular point pattern portion 11b of one substrate 11 is rubbed in the direction C, which is orthogonal to the rubbing direction A. The other board 1 is rubbed again, and the other board 1 is rubbed again in the same way.
The normal point pattern portion 12b of No. 2 is in the rubbing direction B.
It is rubbed again in the C′ direction, which is perpendicular to the .
It is convenient to rub the regular point pattern portion 11b again by using a rubbing mask 13 having an opening 13a having a shape corresponding to the regular point pattern portion 11b of one substrate 11, as shown in FIG. , the regular point pattern portion 12b of the other substrate 12 may be rubbed again in the same manner.

Polarizing plates 14 and 15 having polarization directions shown by arrows D and E are arranged on the outside of the substrates 11 and 12 formed in this manner so as to form parallel Nicols.

The liquid crystal display device according to the present invention is constructed as described above, and includes the normal point pattern portion 1 of one substrate 11.
Regarding 1b, a first uniaxially oriented regular point pattern area is formed, and its orientation direction is perpendicular to the polarization directions D and E of the polarizing plates 14 and 15,
Therefore, the liquid crystal molecules and the dichroic dye (not shown) sealed between the substrates 11 and 12 are polarized by the polarizing plates 14 and 15.
By arranging them perpendicularly to the polarization directions D and E, a normal point pattern of white display can be obtained without being affected by the dichroic dye. Also, the other board 1
Regarding the second normal point pattern section 12b, a second normal point pattern area is formed, and its alignment direction is parallel to the polarization directions D and E of the polarizing plates 14 and 15, and therefore, the liquid crystal molecules and The dichroic dyes are arranged parallel to the polarization directions D and E of the polarizing plates 14 and 15, and under the influence of the dichroic dyes, a color unique to the dye is displayed. In this way, the liquid crystal display device 10 displays white in the first regular pattern area, and displays the color of the dichroic dye in the second regular pattern area, thereby providing a two-color display in the regular pattern. It becomes possible to do so.

Furthermore, the polarizing plate 14 or 15 and the substrate 11 or 1
If a black mask (not shown) having a pattern such as a predetermined character is provided between the two or on the inner surface of the substrate 11 or 12, it is possible to display a regular point pattern of any complex shape in two colors. be.

Note that the regular point pattern portions 11b of the substrates 11 and 12,
The portions other than 12b have a normal TN orientation, and by appropriately applying current to electrodes (not shown), the liquid crystal in the liquid crystal cell can be adjusted in any segment area, such as a 7-segment number display pattern. is in a state where it can transmit light, and a desired number or other display can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the two substrates constituting the liquid crystal cell are rubbed in a direction perpendicular to each other so as to have a normal TN orientation, and the first regular point pattern of one substrate is The region corresponding to the second regular point pattern on the other substrate is rubbed again in the direction perpendicular to the rubbing direction of each substrate, thereby forming two regular uniaxial orientations perpendicular to each other. A black mask having a dot pattern area formed therein, preferably including a predetermined regular dot pattern shape, is disposed to face the first regular dot pattern area, and further faces to sandwich the substrate. The polarizing plate is arranged so that the polarizing plate becomes parallel Nicol, and has a constant pattern so that one constant pattern area displays white color and the other constant pattern area displays the color of dichroic dye. Since the TN guest-host type liquid crystal display device is configured, the uniaxial alignment directions of the normal point pattern area corresponding to the first normal point pattern and the normal point pattern area corresponding to the second normal point pattern are set to be orthogonal to each other. Therefore, it is not affected by the dichroic dye in the liquid crystal in the normal point pattern region, which has an alignment direction perpendicular to the polarization direction of the polarizing plate, which is arranged so as to face the substrate so as to be parallel Nicols. White color is displayed, and in the normal point pattern area with the alignment direction parallel to the polarization direction, the color display is performed under the influence of the dichroic dye in the liquid crystal, and thus the TN guest The regular point pattern in the host type liquid crystal display device enables two-color display.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an expanded state of an embodiment of the liquid crystal display device according to the present invention, and FIG. 2 is a plan view of a rubbing mask used when rubbing the regular point pattern portion 11b of the substrate 11. . FIG. 3 is a developed perspective view showing an example of a conventional liquid crystal display device having a regular point pattern. 10...Liquid crystal display device, 11, 12...Substrate,
11a, 12a...display pattern, 11b...first regular point pattern, 12b...second regular point pattern, 13...rubbing mask, 13a...opening, 14, 15...polarizing plate.

Claims (1)

[Claims] 1. Two substrates constituting a liquid crystal cell are rubbed in a direction perpendicular to each other so as to have a normal twisted nematic orientation, and an area of one substrate corresponding to a first regular point pattern and the area corresponding to the second regular point pattern on the other substrate are rubbed again in a direction perpendicular to the rubbing direction of each of the substrates, thereby forming two uniaxially oriented regular point pattern areas perpendicular to each other. Further, polarizing plates are arranged so as to be parallel Nicols so as to sandwich the substrate, one regular point pattern area displays white, and the other regular point pattern area displays two colors. 1. A twisted nematic guest-host type liquid crystal display device having a normal point pattern, characterized in that it displays colors of sexual pigments. 2. The liquid crystal display device according to claim 1, wherein a black mask including a predetermined regular point pattern shape is disposed opposite to the first regular point pattern area. 3. The liquid crystal display device according to claim 1, wherein each region corresponding to the first and second regular point patterns is rubbed by a rubbing mask each having an opening.