JPS61100725A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To display plural colors by forming a TN type liquid crystal layer and a GH type liquid crystal layer as liquid crystal cell having the structure of two layers and arranging polarizing plates on the front and back of the liquid crystal cell. CONSTITUTION:Color display is switched by turning on and off the TN type liquid crystal layer 16 and the GH type liquid crystal layer 17. When a red polarizing plate is used as a polarizing plate 11, blue dichroic coloring matter molecules are adopted as the coloring matter molecules of the layer 17 and a coloreless polarizing plate is used for a polarizing plate 15, the dispaly operations of respective modes 1-4 shown in the Table 1 are executed. Thus, four color displays consisting of blue, red, colorless and mixed color can be attained by turning on and off the layers 16, 17.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a liquid crystal display device capable of multicolor display.

Prior Art Conventionally, as a liquid crystal display device capable of color display, the second
As shown in the figure, there is a known device in which a color filter, a printing plate called a transmissive plate or a colored plate 2 is arranged in front of the light a+, and a black and white display type liquid crystal cell 3 is further arranged in front of it. According to this configuration, each of the 4i color lights modulated by the plurality of colored parts of the printing plate or colored Fi2 is appropriately transmitted through the liquid crystal cell 3 by the shutter effect of the liquid crystal cell 3, and the color of the desired pattern is formed. Display is performed.

However, since the liquid crystal cell 3 cannot achieve a perfect glossy effect, the printing plate or colored plate 2 is used even during non-color display.
The color tones of the colored parts of the printing plate appear to be mixed, and since the liquid crystal cell 3 is generally a T or N type liquid crystal cell, the viewing angle range where uniformity can be seen is limited due to its operating principle. Also, Newton's rings may occur when the color plate 2 and the liquid crystal cell 3 are overlapped, and the color display of each display pattern is limited to two colors.

In view of the above points, the present invention does not allow color tones to be seen through when not in operation, does not cause Newton's rings, and enables multi-color display of three or more colors with a wide viewing angle range. The purpose of this invention is to provide a liquid crystal display device.

Interchange-1 This purpose is to use a substrate consisting of three glass plates etc. arranged in parallel, a TN type liquid crystal layer arranged between the first substrate and the second substrate among the substrates. , a homogeneously arranged GH type liquid crystal layer disposed between a second substrate and a third substrate, and a polarizing plate disposed on the front side of the first substrate and the rear side of the third substrate. The present invention is solved by a liquid crystal display device characterized in that:

The present invention will be described below based on an embodiment shown in the drawings. In FIG. 1, numeral 10 is a liquid crystal display device, which is constructed as follows in order from the light source side. That is, 11 is a polarizing plate, 12 is a first substrate made of a glass plate, 13 is a second substrate made of a glass plate, X4 is a third substrate made of a glass plate, and 15 is sealed to the polarizing plate 11. A TN type liquid crystal 1116 is disposed between the first substrate 13 and the second substrate 14, and a TN type liquid crystal 1116 is disposed between the first substrate 13 and the second substrate 14. A G)l-type liquid crystal layer 17 is disposed between the temporary 13 and the third substrate 14, and the G)l type liquid crystal layer 17 is arranged homoniously so that the long axis of the dye molecules is parallel to the polarization axis direction of the polarized light vi15. has been done. A two-layer liquid crystal cell is constructed between the three substrates 12, 13 and 14.

Since the embodiment of the present invention is configured as described above, TN
type liquid crystal layer 16 and GHN type liquid crystal layer 170N10 F F
Color display can be switched by operation.

For example, if the polarizing plate 11 is a red polarizing plate, blue monochromatic dye molecules are adopted as the dye molecules of type 1 (type liquid crystal +117), and furthermore, the polarizing plate I5 is a colorless polarizing plate, as shown in the attached table ( , display operations in each mode (I) to (4) are performed. That is, the (+) TN type liquid crystal layer 16 and the GHN
When both type liquid crystal layers 17 are OFF: The incident light from the light source is polarized by the polarizing plate 11, and has a vibration component of 111, and furthermore, the T of the OF + r-shaped suspension is polarized.
This optically rotated light is optically rotated by the N-type liquid crystal layer 16, and is absorbed by the dye molecules in the CI (OFF-state) type liquid crystal layer 17, and its vibrational component is parallel to the polarization axis of the polarizing plate 15. , blue polarized light is emitted from the polarizing plate 15, and thus a blue display is performed. (See FIG. 1 (1)) (2) TN type N-type liquid crystal layer 1916 and G N-type liquid crystal layer 17
When both are ON = The incident light from the light source is polarized by the polarizing plate 11 with a vibration component in the direction of Reno J, and the TN type liquid crystal J in the ON state is further polarized by the polarizing plate 11.
l! This liquid crystal layer 16 is not rotated by i3
Then, the dye molecules in the GHN type liquid crystal layer 17 in the ON state pass through this liquid crystal layer 17 without being absorbed, and the vibration component thereof is perpendicular to the polarization axis of the polarizing plate 15.
5 emits red polarized light, thus producing a red display. (See Figure 1 (2)) (3) When the TN type liquid crystal N16 is OFF, the GHN type liquid crystal layer 17
When ON: The incident light from the light source becomes polarized light having a vibration component in one direction by the polarizing plate ti, and is further optically rotated by the TN type liquid crystal layer (6) in the OFF state, and this optically rotated light is
G in the N state is not absorbed by the dye molecules in the N-type liquid crystal layer 17 and is transmitted through this metallurgical layer 17, and its vibrational component is parallel to the polarization axis of the polarizing plate 15, so it is colorless from the polarizing plate 15. Polarized light is emitted, and a colorless display is produced by the comb.

(Refer to No. 11N (3)) (4) When the rN type liquid crystal layer 16 is ON and the Itl type liquid crystal layer 17 is OFF: Incident light from the light source becomes polarized light having a vibration component in one direction by the polarizing plate 11, Furthermore, the ON state'"N-type liquid crystal layer 1
6, the light passes through this liquid crystal layer 16 without being rotated, and then it is in the OFF state! The point G is absorbed by the dye molecules in the N-type liquid crystal layer 17, and its vibrational component is perpendicular to the polarization axis of the polarizing plate 15, so that polarized light with a mixed color of red and blue is emitted from the polarizing plate 15. A mixed color display is performed (Figure 1 (4>, v, light). As described above, the l' N-type liquid crystal layer 16 and the G It-type liquid crystal FJ17 (DON10FFL% C, N, T?W)
Color, red, colorless and mixed Japanese and French color display can be performed.

As described above, according to the present invention, a TN type liquid crystal layer and a GH type liquid crystal layer are formed as a two-layer liquid crystal cell, and polarizing plates are disposed before and after the liquid crystal cell. Since the liquid crystal display element is constructed, two liquid crystal layers, namely a TN type liquid crystal layer and a cl-
By 0N10FF operation of type 1 liquid crystal layer? Since a multi-color display with 31 colors can be performed, the color tone does not show through when it is not in operation, and therefore clear color display switching can be performed, and the GH type liquid crystal layer has a bomogeneous alignment. Because it is a liquid crystal cell with a 2N structure with three substrates, the parallax between the two liquid crystal layers is so small that it can be virtually ignored, and the two liquid crystal layers There is no danger of 221ton ring occurring by overlapping the two liquid crystal layers, and furthermore, a faded color display can be performed by turning on/off the two liquid crystal layers, so it is extremely childlike.

Separate table

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of a liquid crystal display device according to the present invention, and FIG. 2 is a perspective view showing an example of a conventional LC display device. 1...Light source, 2...Printing board or colored board, 3...
・Liquid crystal cell, 10...Liquid crystal display device, 11...
Polarizing plate, 12.13.14...Substrate, 15...Polarizing plate, 16...TN type liquid crystal layer 17...GH type liquid crystal layer.

Claims (1)

[Claims] A substrate consisting of three glass plates etc. arranged in parallel, a TN type liquid crystal layer arranged between the first substrate and the second substrate, and a second substrate and a second substrate. It is characterized by being composed of a homogeneously arranged GH type liquid crystal layer disposed between the third substrate and a polarizing plate disposed on the front side of the first substrate and the rear side of the third substrate. A liquid crystal display device.