JPS5939724B2 - liquid crystal display element - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid crystal display element.

In the conventional FEM-TM type liquid crystal cell, as shown in FIG. 1, when no voltage is applied, the liquid crystal molecules 1 are twisted with their long axes parallel to the surfaces 2a and 2b of the glass 2. In addition, when a voltage is applied, the long axis direction is perpendicular to the surfaces 2a and 2b of the glass 2, and no light is transmitted.

In this state, the optical axis is set at 9 on both the front and back sides of the liquid crystal cell.
Paste two polarizing plates (not shown) with a 0 degree shift,
By allowing the light that has traveled to the destination to pass through and blocking the light that has not traveled to the destination, it was possible to create a bright and dark display where the area where no voltage was applied was bright and the area where the voltage was applied was dark. However, in the area where no voltage is applied, the liquid crystal molecules are twisted with their long axes parallel to the glass surface, and because they only have optical rotation and do not have birefringence, they cannot be displayed by brightness or darkness. There were some drawbacks that could only be avoided.

This invention was made in view of the above drawbacks, and includes:
The purpose of this is to twist the long axis direction of the liquid crystal molecules in the FEM-TN type liquid crystal cell at a certain angle with the glass surface so that they are birefringent when no voltage is applied. It is an object of the present invention to provide an FEM-TN type liquid crystal display element that can display color.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 3 is a side view of an FEM-TN type liquid crystal cell according to the present invention, and FIG. 4 is a view of FIG. 3 viewed from direction A. mutually parallel glass plates 11 constituting the liquid crystal cell 10;
Between 12 and 12, when no voltage is applied, each liquid crystal molecule 13
The major axis direction of each liquid crystal molecule 13 is the glass plate 11, 1.
2, for example, 45 degrees, and
Each liquid crystal molecule 13 is oriented so as to be twisted in a certain direction and at a certain angle.

At the same time, when voltage is applied, each liquid crystal molecule 13
As shown in FIG. 5, the long axis direction of each liquid crystal molecule 13 is oriented perpendicular to the glass plates 11 and 12. In this case, the long axis direction of each liquid crystal molecule 13 is set to the glass plate 1.
Methods for twisting the glass at a constant angle θ with respect to 1 and 12 include dipping glass that has been subjected to a wrapping orientation process similar to the conventional FEM-TN method in a vertical alignment agent such as lecithin, and diagonal evaporation. There are methods such as changing the angle to maintain a constant angle θ.

As described above, when no voltage is applied, the liquid crystal molecules 13 have their long axes aligned with the glass plates 11 and 1, as shown in FIG.
They are oriented at a constant angle θ with respect to the glass plate 2 and twisted at a constant angle in a constant direction with respect to each other, and when a voltage is applied, the major axis direction is the glass plate as shown in FIG. It is oriented perpendicular to 11 and 12.

Therefore, for example, as shown in FIG.
When the area where no voltage is applied, the character display area 21 is in a dark state, and the other areas 22 are the glass plate 11 of the liquid crystal molecules 13,
The color determined by the angle θ with respect to the liquid crystal molecules 12, that is, the color produced by birefringence of transmitted light according to the orientation of the liquid crystal molecules 13 and the phase difference thereof, is projected.

As described above, according to the present invention, the long axis direction of the liquid crystal molecules in the FEM-TN type liquid crystal cell is twisted at a constant angle with the glass surface so that the transmitted light is birefringent when no voltage is applied. However, when a voltage is applied, the orientation is perpendicular to the glass surface, so the voltage applied area is dark, and the non-voltage applied area is set at a predetermined angle to the glass surface in the long axis direction of the liquid crystal molecules. Therefore, by changing the angle of the liquid crystal molecules with respect to the glass surface, the colors can be changed for each liquid crystal display element, which improves the fashionability of the liquid crystal display element. can be improved.

[Brief explanation of the drawing]

Figure 1 shows the orientation state of liquid crystal molecules in a conventional FEM-TN type liquid crystal cell when no voltage is applied, and Figure 2 shows the orientation state of liquid crystal molecules in the liquid crystal cell shown in Figure 1 when voltage is applied. FIG. 3 is a diagram showing the configuration of an embodiment of the present invention.
4 is a view of FIG. 3 viewed from direction A, FIG. 5 is a view showing the alignment state of liquid crystal molecules when voltage is applied to the liquid crystal cell in the embodiment shown in FIG. 3, and FIG. It is a front view when the liquid crystal cell of the Example shown in a figure is used for a time display board. 10... Liquid crystal display element, 11, 12... Glass plate,
13...Liquid crystal molecules.

Claims (1)

[Claims] 1. An FEM in which two polarizing plates are placed on both sides of a liquid crystal cell with their optical axes shifted by 90 degrees, allowing rotated light to pass through and blocking non-rotated light for display.
In a TN type liquid crystal display element, the orientation of the liquid crystal molecules interposed between the two substrates of the liquid crystal cell is such that when no voltage is applied, transmitted light is birefringent and colors are projected due to the phase difference. A liquid crystal display characterized in that the liquid crystal display has a twisted orientation in a rising state forming a constant angle with respect to the substrate surface, and is configured such that the liquid crystal molecules rise in a direction perpendicular to the substrate surface when a voltage is applied. element.