JPH0415449B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a liquid crystal display device that is thin and has low power consumption and is used in the instrument panel of a car or the display part of an office machine, and particularly relates to a liquid crystal display device that displays a positive display in one cell. The present invention relates to a guest-host liquid crystal display device that is provided with a portion that performs negative display.

[Conventional technology]

Conventional guest-host liquid crystal devices that have a positive display area and a negative display area in their cells have a third
There is a device as shown in FIG.
1 and 12 are aligned by a method such as applying a vertical alignment agent, and similarly, the negative display area 14 is aligned by a method such as rubbing so that each is horizontally aligned, and then the vertically aligned positive The display area 13 and the horizontally oriented negative display area 14 are further partitioned and sealed at the periphery with a sealant 15, and the positive display area 13 is injected with a dielectric difference through injection ports 16 and 17 provided respectively. When a guest-host liquid crystal with a negative orientation value is injected, the liquid crystal normally stands upright with respect to the glass substrate, but becomes horizontal when a driving voltage is applied, and the negative display area has a positive dielectric anisotropy value. By injecting a certain guest-host liquid crystal, a liquid crystal display device having two regions, normally horizontal, but vertical with positive display and negative display, was obtained by applying a driving voltage. In addition, on the display surface side of the liquid crystal display, there is a polarizing plate 1 to make the display even clearer.
8 is provided.

[Problem to be solved by the invention]

However, the conventional liquid crystal display device described above is
Since a sealant is used to form the boundary between the positive display area and the negative display area, the dividing line created by the sealant is clearly visible from the display surface, causing a problem that seriously impairs the quality of the display. It was hot. In addition, since two types of liquid crystals are required, one for positive display and one for negative display, the liquid crystal cell naturally requires two liquid crystal injection ports, which requires twice as much time and effort in the manufacturing process. For example, when a positive display area surrounded by a negative display area is required, the injection port for the positive display area interferes with the negative display area, resulting in a portion that cannot be displayed (third problem). (see figure) also occurred.

[Means to solve the problem]

As a specific means for solving the above-mentioned conventional problems, the present invention provides a guest-host liquid crystal display device in which a cell has a horizontal alignment region and a vertical alignment region, and the positive and negative dielectric anisotropy values are different. A liquid crystal for dual-frequency driving that changes depending on the applied frequency is sealed, and the horizontal alignment area is driven at a frequency that makes the value of the dielectric anisotropy positive to form a negative display area,
By providing a liquid crystal display device, wherein the vertical alignment region is made into a positive display region by driving at a frequency where the value of the dielectric anisotropy becomes negative.
This solves the conventional problems by eliminating partitions with sealants on the display surface and eliminating areas that cannot be displayed.

【Example】

Next, the present invention will be explained in detail based on an embodiment shown in the drawings. 1a and 1b in the figure are glass substrates of a liquid crystal display device, and the glass substrates 1a and 1b are
Transparent electrodes 2a, 2b and alignment films 3a, 3b are arranged in a conventional manner on b, and the alignment films 3a,
The entire surface of 3b is subjected to alignment treatment in the same direction by a method such as rubbing, so as to obtain parallel horizontal alignment treatment. Furthermore, the glass substrate 1a,
In the positive display area indicated by the symbol P in the figure 1b, vertical alignment processing is performed by applying vertical alignment agents 4a and 4b to cover the alignment films 3a and 3b by an appropriate method such as printing or painting, By doing so, the portion covered with the vertical alignment agents 4a and 4b becomes a positive display area P, and the other portions are
This becomes a negative display area N. The glass substrates 1a and 1b, each of which has been processed as described above, are placed facing each other, and the peripheral portions are sealed with the sealant 5, and the dielectric anisotropy value △ is determined by the driving frequency inside the cell.
A guest-host liquid crystal 6 for dual-frequency driving in which ε changes between positive and negative is injected and sealed, and a polarizing plate 7 is attached to the display surface side in the same polarization direction as that in which the horizontal alignment process was performed. The positive display area P of the liquid crystal display device manufactured by the method explained above has a dielectric anisotropy value of △
By driving at frequency 1 where ε is negative, a positive display that is transparent when no drive voltage is applied and opaque when it is applied can be performed, and the negative display area N
By driving at a frequency 2 at which the dielectric anisotropy value Δε is positive, negative display can be performed which is opaque when no driving voltage is applied and transparent when applied. What is shown in FIG. 2 is an example of the display of the liquid crystal display device according to the present invention, in which a positive display is performed in the positive display area P, a negative display is performed in the negative display area, and the two displays are joined. There are no marking lines caused by sealants or the like.

【Effect of the invention】

As explained in detail above, according to the present invention, there is a horizontal alignment region and a vertical alignment region in one cell, and a dual-frequency drive liquid crystal is sealed in which the dielectric anisotropy value changes depending on the applied frequency. and
The horizontal alignment area is driven at a frequency where the dielectric anisotropy value is positive to provide a negative display area, and the vertical alignment area is driven at a frequency where the dielectric anisotropy value is negative to provide a positive display area. This has the effect of eliminating interference between the dividing lines and the liquid crystal injection port caused by sealants on the display surface, greatly improving the quality of the display, and further improving the quality of the display by injecting and sealing one type of liquid crystal. This makes it possible to manufacture a liquid crystal display device capable of negative display, reduces the number of manufacturing steps, and has excellent effects in improving production efficiency.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a liquid crystal display device according to the present invention, FIG. 2 is an explanatory view showing an example of display of a liquid crystal display device according to the present invention, FIG. 3 is a front view of a conventional example, and FIG. The figure is a sectional view taken along the - line in FIG. 3. 1a, 1b...Glass substrate, 2a, 2b...Transparent electrode, 3a, 3b...Alignment film, 4a, 4b...
Vertical alignment agent, 5...Sealing agent, 6...Liquid crystal, 7...
…Polarizer.

Claims (1)

[Claims] 1. In a guest-host liquid crystal display device, a cell has a horizontal alignment region and a vertical alignment region, and a dual-frequency drive liquid crystal whose dielectric anisotropy value changes depending on the applied frequency is sealed, and the cell has a horizontal alignment region and a vertical alignment region. The area is driven at a frequency that makes the dielectric anisotropy value positive to make it a negative display area, and the vertical alignment area is made to be a positive display area by driving it at a frequency that makes the dielectric anisotropy value negative. A liquid crystal display device characterized by: