JPS6298329A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To eliminate an irregularity in the display of an image by providing signal electrodes at intervals as plural electrode groups, providing scanning electrodes crossing those signal electrodes at right angles, and further providing a scanning electrode astraddle on boundaries of the signal electrode groups. CONSTITUTION:The 1st substrate is provided with numbers of signal electrodes 4. The 2nd substrate is provided with numbers of signal electrodes 5 crossing the scanning electrodes 4 at right angles separately as the 1st electrode group alphaand the 2nd electrode group beta about the center. The wide scanning electrode 4a is arranged astraddle on the boundary between the 1st electrode group alphaand the 2nd electrode group beta. Then liquid crystal is held between the 1st substrate and the 2nd substrate and an electric field is applied to the respective electrodes 4 and 5 to display an image. Thus, the scanning electrode is arranged astraddle on the boundary between the signal electrode groups, so the intensity of the electric field is made uniform between the boundary part and other parts to display the image excellently.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The invention relates to a liquid crystal display element that displays images through a liquid crystal substance.

[Technical background of the invention and its problems]

2. Description of the Related Art In recent years, with the expansion of uses for liquid crystal display elements, dot matrix type liquid crystal display elements capable of displaying, for example, television images, have been developed and are being put into practical use.

A dot matrix type liquid crystal display element has a liquid crystal material filled and sealed between a first substrate on which a large number of scanning electrodes are formed and a second substrate on which a large number of signal electrodes are formed in a direction perpendicular to the scanning electrodes. Then, a predetermined voltage is applied between the selected signal electrode and the scanning electrode through the leads connected to each of the signal electrodes, and the liquid crystal substance (molecules) at the intersection of the signal electrode and the scanning electrode is made to behave. Dots are formed by transmitting or blocking light, and an image is displayed based on the combination of these dots.

As shown in FIGS. 5 and 6, in such a dot matrix type liquid crystal display element, each scanning electrode a...
Each signal electrode b arranged in a direction orthogonal to...
is divided into an electrode group α on one side of the substrate and an electrode group β on the other side, and a lead is connected to the signal electrode b of each electrode group α, β, respectively. are connected to each other, and each electrode group α and β is driven by an individual drive circuit through these leads. This makes it possible to control a large number of dots at high speed and improve resolution. There is a multi-variable matrix method.

However, in such a multi-matrix type liquid crystal display element, at the boundary between one electrode group α and the other electrode group β, both the scanning electrode a and the signal electrode are present, and the area portion (A portion) is Therefore, when a voltage is applied between, for example, the scanning electrode a1 and the signal electrode b1 adjacent to that area, the electric field intensity applied to the liquid crystal material in the part A on the side corresponding to the boundary and the opposite side signal line ff1b
The electric field strength applied to the liquid crystal material in the area (part B) where only 1 exists is different, that is, the signal electrode b1 and the scanning electrode a
Due to the influence of the electric field in the diagonal direction between 1 and 1, the electric field strength applied to the liquid crystal substance in part B becomes stronger than that in part A, and as a result, the behavior of the liquid crystal material in parts A and B differs. However, there was a problem in that the amount of transmitted light, that is, the brightness, varied, resulting in uneven display on the screen.

[Purpose of the invention]

This invention has been made with attention to these points, and its purpose is to eliminate the problem of the boundary between the electrode groups in the area where the beam and scan m poles do not face each other. The electric field strength applied to the liquid crystal material in the #4 area on the side and the electric field strength applied to the liquid crystal material in other areas are kept almost uniform, so that an image with almost no display unevenness can be displayed. It is an object of the present invention to provide a liquid crystal display element that has the following properties.

[Summary of the invention]

That is, in this invention, first and second substrates are spaced apart from each other and face each other, a liquid crystal material is filled and sealed between them, a plurality of scanning electrodes are formed in parallel on the first substrate, and a plurality of scanning electrodes are formed in parallel on the first substrate. A large number of signal electrodes are formed in parallel in a direction perpendicular to the scanning electrode, each of the signal electrodes is divided into a plurality of electrode groups, and each signal electrode of each electrode group is connected to each of the above-mentioned signal electrodes. In a device that displays an image by applying a predetermined voltage between the scanning electrode and the scanning electrode, the scanning electrode at the portion corresponding to the boundary between the electrode groups is placed across both of the signal electrodes of both electrode groups. They are arranged to face each other.

(Embodiment of the Invention) An embodiment of the invention will be described below with reference to FIGS. 1 to 4.

In the figure, 1 is a first substrate, 2 is a second substrate, and these substrates 1
．． 2 are each made of a transparent glass plate, are vertically spaced apart from each other, are bonded to each other via a sealing material 3 at the periphery, and are filled and sealed with a liquid crystal substance LC inside.

A large number, for example, 108 transparent scanning electrodes 4 are formed on the inner surface (lower surface) of the first substrate 1, and each of the above-mentioned scanning electrodes is formed on the inner surface (upper surface) of the second substrate 2. 4...
A large number of transparent signal electrodes 5, for example 450, are formed in a direction perpendicular to the direction. One end edge of the first substrate 1 extends outside the sealing material 3 as a terminal arrangement section 1a,
Drive circuit connection terminals 6 corresponding to each of the scanning electrodes 4 are arranged in this terminal array portion 1a, and these drive circuit connection terminals 6 and their corresponding scanning electrodes 4 are formed in an array.
. . . are connected via leads 7 . Note that each drive circuit connection terminal 6 and each lead 7 is formed integrally with the scanning electrode 4 using a transparent conductive material such as indium oxide.

The signal electrodes 5 arranged in parallel on the second substrate 2 are divided equally in the middle in each row, and the signal electrodes 5 converge on one side of the center line along the longitudinal direction of the substrate 2. It is separated into one electrode group α and a second electrode group β gathered on the other side. Further, both side edges of the second substrate 2 protrude outside the sealing material 3 as terminal arrangement parts 2a and 2b, and one of the terminal arrangement parts 2a has each signal electrode 5 in the first electrode group α. Drive circuit connection terminal 8 corresponding to...
... are formed into an array. These drive circuit connection terminals 8
... are arranged one after the other in a stepped manner, and these drive circuit connection terminals 8 are connected to their corresponding signal electrodes 5 through leads 9, respectively. ing. Further, in the other terminal arrangement section 2b, drive circuit connection terminals 10 corresponding to each signal@electrode 5... in the second electrode group β are connected to each drive circuit connection in the one terminal arrangement section 2a. They are formed in the same arrangement as the terminals 8..., and the corresponding signal electrodes 5...
. . via leads 11 . In addition, each drive circuit connection terminal 10... and each lead 11.
. . . are formed integrally with each signal electrode 5 . . . using a transparent conductive material such as indium oxide.

Here, the width of the scanning electrode 4a corresponding to the boundary between one electrode group α and the other electrode group β is smaller than that of the other scanning electrode 4a.
It is formed wider than that of..., and one '7M
The end of each signal electrode 5 of the pole group α and the other electrode group β
The signal electrodes 5 are arranged so as to straddle and face each other and the end portions of the signal electrodes 5 .

In the liquid crystal display element configured in this way, the signal N pole 5... and the scanning electrode 4... are selectively controlled by time division driving.
A voltage is applied between the selected signal electrode 5... and the scan 1! The liquid crystal material LC at the intersection with the poles 4 behaves to form dots based on the control of the light transmission layer, and an image is displayed by a combination of these dots. In the case of a color display type, color filters of the three primary colors of red, green, and blue are provided alternately on the surface of each signal electrode 5, and colored dots are formed based on these color filters. These dots display a color image.

By the way, the scanning electrode 4a corresponding to the boundary between the electrode groups α and β is connected to each signal electrode 5 of one electrode group α and each signal electrode 5 of the other electrode group β. They are arranged so as to straddle and face each other, so that when a voltage is applied between the signal electrode 5a and the scanning electrode 4a, as shown in FIGS. Since an electric field in an oblique direction is applied between the signal electrode 5a and the scanning electrode 4a in the A part on the side where the signal electrode 5a and the scanning electrode 4a
The electric field strength applied to C and the liquid crystal substance L of 8 parts on the opposite side
The electric field strength applied to C becomes almost uniform, the behavior of the liquid crystal material LC is also almost the same, and the amount of transmitted light becomes almost uniform.As a result, the brightness of the screen is almost uniform and an image with almost no display unevenness is displayed. In addition, when obtaining dots based on the scanning electrodes 4a corresponding to the boundaries by time division driving, the mutually corresponding signal electrodes 5 of both electrode groups α and β are simultaneously driven.

〔Effect of the invention〕

As explained above, according to the present invention, since the scanning electrodes corresponding to the boundaries between the electrode groups are arranged so as to straddle and face each signal electrode of both electrode groups, the signal electrodes Even at the boundary between the electrode groups in the area where the and scanning electrodes do not face each other, the electric field strength applied to the liquid crystal substance in the part on the boundary side and the electric field strength applied to the liquid crystal substance in other parts are kept almost uniform. Therefore, it is possible to display a good image with almost no display unevenness.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-m in FIG. 1, FIG. 3 is a plan view for explaining the operation of the embodiment, and FIG. The figures are also sectional views, FIG. 5 is a plan view showing the prior art, and FIG. 6 is a sectional view. 1.2...Substrate, 4...Scanning electrode, 5...Signal electrode, α, β...N pole group.

Claims (1)

[Claims] A first and a second substrate are spaced apart from each other and face each other, a liquid crystal material is filled and sealed between them, a plurality of scanning electrodes are formed in parallel on the first substrate, and a plurality of scanning electrodes are formed on the second substrate. A large number of signal electrodes are formed in parallel in orthogonal directions,
Each of the signal electrodes is divided into a plurality of electrode groups, and a predetermined voltage is applied between each signal electrode of each electrode group and each of the scanning electrodes to display an image. The scanning electrodes in the areas corresponding to the boundaries between the electrode groups are
A liquid crystal display element characterized in that the signal electrodes of both electrode groups are disposed so as to straddle and face each other.