JPH0569432B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a liquid crystal display device formed by laminating a plurality of liquid crystal display elements in which a twistedly aligned liquid crystal layer is interposed between two electrode substrates facing each other. be.

[Prior Art] FIG. 8 is a sectional view showing a conventional liquid crystal display device. In the figure, a plurality of scanning electrodes 3 and signal electrodes 4 made of a transparent conductive film are respectively covered in a band shape orthogonal to each other on opposing surfaces of an upper substrate 1 and a lower substrate 2 made of transparent glass plates. It is formed. Further, on the opposing surfaces of the upper substrate 1 and the lower substrate 2, on which the scanning electrodes 3 and the signal electrodes 4 are formed, respectively, a liquid crystal alignment film 5 formed by, for example, a rubbing process is arranged. Further, the upper substrate 1 and the lower substrate 2 are separated by a predetermined distance,
Their peripheral parts are sealed with a sealing material 6 including a spacer to form an envelope, and a TN (Twisted Nematic) liquid crystal 7 is sealed in this envelope to constitute a liquid crystal display element 8. . Further, on the outer surface of the liquid crystal display element 8, that is, on the outer surfaces of the upper substrate 1 and the lower substrate 2, an upper polarizing plate 9 and a lower polarizing plate 10, whose polarization axes or light absorption axes are parallel to each other, are bonded and arranged, respectively, to display a liquid crystal display. The device is configured.

The liquid crystal display device configured in this way changes the optical properties of the TN liquid crystal 7 by applying a predetermined voltage between the scanning electrode 3 and the signal electrode 4. By transmitting the light incident on the liquid crystal portion sandwiched between the two substrates, the display pattern can be recognized from the display surface of the liquid crystal display element 8, that is, from the front side of the upper substrate 1.

[Problem that the invention seeks to solve]

However, the liquid crystal display device configured in this way has a plurality of scanning electrodes 3 as shown in FIG.
Since it has a simple matrix configuration in which the scanning electrodes 3 and the signal electrodes 4 are combined facing each other in a matrix arrangement, there is a problem that the contrast of the display decreases as the number of scanning electrodes 3 increases. It has been difficult to drive a liquid crystal display device with a large area at a high duty ratio and obtain good display quality.

The first solution to this problem is
As shown in FIG. 0, a liquid crystal display element 8' has been proposed which uses a so-called vertical two-division method in which the signal electrode 4 is divided into a first signal electrode group 4A and a second signal electrode group 4B in the vertical direction with respect to the electrode substrate. However, even if this method is used, there is a limit to increasing the number of scanning electrodes 3 to twice the number due to the structure.

Furthermore, to solve this problem, as shown in FIG. 11, a plurality of upper and lower two-division method elements shown in FIG. 10 are arranged in parallel, and the first element 8
A conceivable method is to increase the number of scanning electrodes 3 and form one display screen by increasing the number of scanning electrodes 3, but since it is necessary to provide an extraction section for the signal electrode group, the first There were problems such as the connection part C between the element 8A' and the second element 8B' being impossible to display.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a liquid crystal display device capable of displaying a large area.

Another object of the present invention is to provide a liquid crystal display device that can display images with good quality.

[Means for solving problems]

The liquid crystal display device according to the present invention is constructed by laminating a plurality of liquid crystal display elements. [Operation] In the present invention, the number of scan electrodes is increased by forming a stacked structure of a plurality of liquid crystal display elements.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a liquid crystal display device according to the present invention, in which figure a is a plan view, and figure b is a sectional view taken along line A-A' in figure a. In the same figure,
Reference numeral 11 denotes an intermediate substrate made of a translucent glass plate; 12 an upper substrate made of a translucent glass plate arranged to face approximately the upper half of one surface of the inner substrate 11;
Reference numeral 3 denotes a lower substrate made of a translucent glass plate, which is disposed to face substantially the lower half of the other surface of the middle substrate 11. A plurality of first scanning electrodes 14 made of a transparent conductive film are formed on the inner surface of the upper substrate 12, and a middle substrate 1 facing the upper substrate 12 is further formed.
1, a plurality of first signal electrodes 15 made of a transparent conductive film are arranged in the vertical direction perpendicular to the first scanning electrode 14.
a, 15b are formed. Furthermore, these first scanning electrodes 14 and first signal electrodes 15a,
A liquid crystal alignment film 16 is formed on the upper substrate 15b, and the opposing peripheral parts of the upper substrate 12 and the middle substrate 11 are sealed with a sealing material 17 containing a spacer to form an envelope. Inside is TN LCD 1
8 is enclosed to form a first liquid crystal display element 20 having an upper and lower dividing line 19. Further, a plurality of second scanning electrodes 21 are formed on the inner surface of the lower substrate 13, and a plurality of second scanning electrodes 21 are formed on the middle substrate 11 facing the lower substrate 13 in the vertical direction perpendicular to the second scanning electrodes 21. second signal electrodes 22a, 22b are formed. In addition, these second scanning electrodes 1
4 and the second signal electrodes 22a and 22b, a liquid crystal alignment film 16 is formed on the lower substrate 13 and the middle substrate 11, and the opposing peripheral portions of the lower substrate 13 and the middle substrate 11 are sealed with a sealing material 17 containing spacers to form an outer surrounding. A second liquid crystal display element 2 is formed in which a TN liquid crystal 18 is sealed and has an upper and lower dividing line 23.
4 are configured.

In the liquid crystal display device configured in this manner, the middle substrate 11 is divided into two parts in the vertical direction, and the first liquid crystal display element 20 and the second liquid crystal display element 24 are formed and arranged so as to be offset from each other. A first signal electrode 15b and a second signal electrode 22a are formed on the front and back surfaces of the substrate 11, respectively, and a first liquid crystal display element 20 and a second liquid crystal display element 24 are formed on the middle substrate 11. are vertically divided into two by upper and lower dividing lines 19 and 23, respectively, so the total number of first scan electrodes 14 and second scan electrodes 21 can be quadrupled. Also,
In such a configuration, a non-displayable portion 25 is formed by the sealing material 17 at the connection portion between the first liquid crystal display element 20 on the upper part of the middle substrate 11 and the second liquid crystal display element 24 on the lower part. 1 signal electrode 15
a, 15b and second signal electrodes 22a, 22b
Since the extraction portions are formed at the upper and lower ends of the display screen, the area of the non-displayable portion 25 can be made smaller than when two liquid crystal display elements are arranged side by side.

FIGS. 2a and 2b are plan views showing other embodiments of the liquid crystal display device according to the present invention, and sectional views taken along the line A-A', and the same parts as those in the previous figures are given the same reference numerals and explanations thereof. is omitted. In this figure, the difference from FIG. 1 is that the upper substrate 12A, which faces one surface of the middle substrate 11, is extended to the lower part, and its peripheral portion is sealed with a sealing material 17, so that the upper substrate 12A, which is opposite to one surface of the middle substrate 11, is sealed with a sealing material 17. One empty cell 26 is formed. Similarly, the lower substrate 13A facing the other surface of the middle substrate 11 is extended to the top, and its peripheral portion is sealed with a sealant 17 to form a second empty cell 27 having no display function. ing.

In such a configuration, the same effect as described above can be obtained, and the display level difference on the surface of the display section can be eliminated.

FIGS. 3a and 3b are plan views showing still another embodiment of the liquid crystal display device according to the present invention, and sectional views thereof taken along the line A-A', and the same parts as those in the previous figures are denoted by the same reference numerals. Explanation will be omitted. In the same figure, the second
The difference from the figure is that the upper substrate 12A is extended to the lower part and its peripheral part is sealed with a sealing material 17.
The internal TN liquid crystal 18 is sealed and the first
A first liquid crystal display element 20 having a scanning electrode 14 of
A is formed. Similarly, the lower substrate 13A
is extended to the top and the surrounding area is covered with sealing material 17.
a second scanning electrode 21 with a TN liquid crystal 18 sealed therein and a second scanning electrode 21 only in the lower half;
A liquid crystal display element 24A is formed.

In such a configuration, exactly the same effect as described above can be obtained, and the non-displayable portion 25 in FIG.
This eliminates the need for a display unit with a large area.
In this case, the rubbing direction of the liquid crystal 18 at the lower part of the first liquid crystal display element 20A and the upper part of the second liquid crystal display element 24A, and the rubbing direction of the upper polarizing plate 9 and the lower polarizing plate 10
It is necessary to adjust the light absorption axis or polarization axis of the light as shown in FIG. Moreover, the same effect can also be obtained by changing the rubbing directions in the first liquid crystal display element 20A and the second liquid crystal display element 24A, as shown in FIG.

FIG. 6 is a cross-sectional view showing another embodiment of the liquid crystal display device according to the present invention, and the same parts as those in the previous figures are given the same reference numerals, and the explanation thereof will be omitted. In this figure, the difference from FIG. 3 is that the first liquid crystal display element 2
Between 0A and the second liquid crystal display element 24A, a first intermediate substrate 11a made of a transparent glass plate and a second
A plurality of third scanning electrodes 28 and third signal electrodes 29a and 29b are arranged facing each other in the vertical direction at the center between the middle substrates 11b. A third liquid crystal display element 31 having an upper and lower dividing line 30 is constructed by sealing the TN liquid crystal 18 inside, and as shown in FIG. 7, each liquid crystal display element 20A,
A liquid crystal display device having a three-layer structure is constructed by setting the rubbing directions 24A and 31.

The liquid crystal display device configured in this manner includes a first liquid crystal display element 20A and a second liquid crystal display element 24A.
By adopting the three-layer structure of the third liquid crystal display element 31, it becomes possible to have scanning electrodes 14, 21, and 28, and it becomes possible to have more scanning electrodes than before in one display element. .

〔Effect of the invention〕

As explained above, the liquid crystal display device according to the present invention is constructed by laminating a plurality of liquid crystal display elements having a simple matrix structure, so that the number of scanning electrodes can be easily increased, so that driving can be performed at a low duty ratio. This makes it possible to achieve extremely excellent effects such as displaying images with good quality.

[Brief explanation of drawings]

FIGS. 1a and 1b are plan views showing one embodiment of a liquid crystal display device according to the present invention, and sectional views thereof taken along line A-A';
2a, b and 3a, b are plan views showing other embodiments of the liquid crystal display device according to the present invention;
-A' line cross-sectional view, Figure 4 is a perspective view showing the arrangement of the polarization axes or light absorption axes of the upper and lower polarizing plates of the liquid crystal display device shown in Figure 3, and Figure 5 is shown in Figure 3. A sixth perspective view showing the rubbing direction of the first liquid crystal display element and the second liquid crystal display element of the liquid crystal display device.
The figure is a sectional view showing still another embodiment of the liquid crystal display device according to the present invention, and FIG. 7 is a perspective view showing the relationship between the polarization axes or light absorption axes of the upper and lower polarizing plates of the liquid crystal display device shown in FIG. , FIG. 8 is a sectional view showing a conventional liquid crystal display device, and FIGS. 9 to 11 are plan views showing the electrode arrangement configuration of the conventional liquid crystal display device. 9... Upper polarizing plate, 10... Lower polarizing plate, 11...
Middle board, 11a...First middle board, 11b...Second middle board, 12, 12A...Upper board, 13,1
3A... lower substrate, 14... first scanning electrode, 15
a, 15b...First signal electrode, 16...Liquid crystal alignment film, 17...Sealing material, 18...TN liquid crystal, 1
9... Two dividing line, 20, 20A... First liquid crystal display element, 21... Second scanning electrode, 22a, 22
b...Second signal electrode, 23...2 dividing line, 2
4, 24A...Second liquid crystal display element, 25...Displayable portion, 26...First empty cell, 27...Second
empty cell, 28... third scanning electrode, 29a, 2
9b... Third signal electrode, 30... Upper and lower dividing line, 31... Third liquid crystal display element.

Claims (1)

[Scope of Claims] 1. A second light-transmitting electrode substrate is disposed opposite to one surface of the first light-transmitting electrode substrate, and the first light-transmitting electrode substrate and the second light-transmitting electrode A plurality of first signal electrodes and a plurality of first scanning electrodes are formed and arranged in a matrix on the surface facing the substrate, and the first light-transmitting electrode substrate and the second light-transmitting electrode substrate are connected to each other. a first liquid crystal display element having a liquid crystal sealed therebetween; and a first liquid crystal display element formed on the other surface of the first light-transmitting electrode substrate on which the first liquid crystal display element is not formed. A third light-transmitting electrode substrate is disposed opposite to each other in the portion where the light-transmitting electrode substrate is not exposed, and a plurality of second signal electrodes are provided on opposing surfaces of the first light-transmitting electrode substrate and the third light-transmitting electrode substrate, respectively. a second liquid crystal display element in which second scanning electrodes are formed and arranged in a matrix, and liquid crystal is sealed between the first light-transmitting electrode substrate and the third light-transmitting electrode substrate; A liquid crystal display device characterized by: