JPH05297393A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To make a display sharper and more accurate and improve the quality of the liquid crystal display element by eliminating a place where a long dummy electrode part succeeds at an end part. CONSTITUTION:A transparent electrode 3 formed on a common-side glass substrate 1 is formed continuously up to a terminal part 3c for connection through a lead-out part 3b bent from a display part 3a crossing a transparent electrode 4 on a segment-side glass substrate 2. Then a nearly triangular dummy electrode 3d is provided outside the lead-out part 3b to prevent an error in inter-cell gap due to electrode thickness from being generated. This dummy electrode part 3d is connected to an outside electrode so as to prevent electrostatic charging. Further, a dummy electrode part needs to be provided on the other side of the display part 3a similarly so as to hold the gap between the left and right cells uniform. In this case, the tip of the common-side transparent electrode 3 is linearly extended from the display part 3a that the segment-side transparent electrode 4 crosses as it is and a dummy electrode 3e of equal area is formed atop of each transparent electrode 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large liquid crystal display device of the TN or STN system.

[0002]

2. Description of the Related Art A liquid crystal display device is formed by sandwiching a liquid crystal film (not shown) between two glass substrates 1 and 2 provided with transparent electrodes (not shown) as shown in FIG. , The transparent electrodes 3 provided on the glass substrates 1 and 2 as shown in FIG.
In the display units 3a and 4a where 4 intersects, a voltage is applied to a desired position to change the orientation of the liquid crystal by the generated electric field, and various displays are performed due to the difference in translucency at that time. .. The transparent electrode 3 described above has a different pitch between the display portion 3a and the terminal portion 3c in production. Therefore, as shown in FIG. In order to prevent the occurrence of uneven contrast due to the difference in cell gap caused by the above, the pseudo electrode portion 3d which is not used for connection is provided outside the lead-out portion 3b. And this pseudo electrode part 3d is
It was connected to the outermost electrode to prevent static electricity.

In the liquid crystal display device having the above-mentioned structure, conventionally, in order to make the left and right cell gaps uniform on the other side of the display portion 3a, the pseudo electrode portion 3d and the lead portion 3b are provided as shown in FIG. The similar pseudo electrode portion 3f was provided in a substantially symmetrical manner.

In the drawings, reference numerals 1'and 2'indicate the glass edges of the glass substrates 1 and 2, respectively, and 4b and 4c indicate the lead-out portion and the terminal portion of the transparent electrode 4, respectively.

[0005]

In the above-mentioned conventional liquid crystal display element, one end of the transparent electrode 3 of the display portion 3a is provided with one end of the transparent electrode 3 and the pseudo electrode portion 3f which is substantially symmetrical to the lead portion 3b and the pseudo electrode portion 3d on the other end side. Since it has been formed, the outer end of the display portion 3a (in the figure,
The area of the pseudo electrode portion 3f connected to the transparent electrodes 3 (upper and lower ends) becomes large, and this portion acts as an antenna, so that even when the voltage is turned off, the electromagnetic waves generated from the cold cathode tube and the like that are additionally provided receive the contrast. However, there is a problem that it changes and adversely affects the display. An object of the present invention is to solve this conventional problem.

[0006]

In the present invention, the above-mentioned conventional problems are solved by linearly projecting the tip of the transparent electrode on the other side of the lead-out portion from the display portion.

[0007]

The pseudo electrode part, in which the tip of the electrode is linearly projected from the display part, keeps the cell gap between the display part and the peripheral part uniform and reduces the area of the part which acts as an antenna, thereby reducing electromagnetic waves. It acts to reduce the influence of.

[0008]

EXAMPLE FIG. 1 is a simplified plan view of a liquid crystal display device.
The liquid crystal display element has a predetermined transparent electrode (not shown) made of an ITO film on each surface by means such as sputtering or heat vapor deposition.
The two glass substrates 1 and 2 on which the above are formed are overlapped with each other with the transparent electrodes intersecting and a liquid crystal film (not shown) interposed therebetween.

FIG. 2 is an enlarged view of a portion A in FIG. 1. As shown, the transparent electrode 3 formed on the glass substrate 1 on the common side intersects with the transparent electrode 4 on the glass substrate 2 on the segment side. The display portion 3a is continuously formed to the connecting terminal portion 3c through the bent lead portion 3b. And
Usually, the terminal pitch of the terminal portion 3c is formed narrower than that of the display portion 3a because it is necessary to manufacture the terminal portion 3c according to the terminal on the device side to be connected. Therefore, if the glass substrates 1 and 2 are stacked as they are, the inter-cell gap is reduced at the corners of the display section 3a, and the display may have uneven contrast. Similarly, a pseudo-triangular pseudo electrode portion 3d (shown by diagonal lines in the figure) is provided to prevent an error in the inter-cell gap due to the electrode thickness. The pseudo electrode portion 3d is provided so as to be connected to the outer electrode in order to prevent charging.

Further, it is necessary to similarly provide a pseudo electrode portion on the other side of the display portion 3a (indicated by symbol B in FIG. 1) in order to keep the gap between the left and right cells uniform. Then, as shown in the enlarged view of FIG. 3, the tip of the common-side transparent electrode 3 is linearly extended from the display portion 3a where the segment-side transparent electrode 4 intersects, and the tip of each transparent electrode 3 has an equal area. The electrode portion 3e (indicated by hatching in the figure) is to be formed.

Therefore, in the liquid crystal display element of the present invention, since the pseudo electrode portion having the same thickness is formed on the outer side of the transparent electrode which constitutes the display portion, when the glass substrates are superposed on each other, The gap is kept uniform, and uneven contrast due to an error in the inter-cell gap does not occur. or,
Since the pseudo electrode part formed at the tip of the transparent electrode has the same area and is short in dimension, it is hard to be affected by electromagnetic waves, and even when electromagnetic waves from a cold cathode tube installed side by side are applied, the OFF voltage is applied. Since the voltage applied to each transparent electrode is made uniform, uneven contrast due to electromagnetic waves is less likely to occur.

In the drawings, reference numerals 1'and 2'indicate the glass edges of the common side glass substrate 1 and the segment side glass substrate 2, respectively. Reference numerals 4b and 4c are a lead-out portion and a terminal portion of the segment side transparent electrode 4, respectively.

In this embodiment, the transparent electrode on the common side has been described as an example, but in the present invention, the pseudo electrode portion for keeping the cell gap uniform is formed by linearly projecting the tip of the transparent electrode, It may be made less susceptible to the influence of electromagnetic waves, and may be provided on the segment side or both transparent electrodes.

[0014]

As described above, in the liquid crystal display element of the present invention, the pseudo electrode portion provided on the other side of the lead-out portion of the transparent electrode formed on the glass substrate in order to keep the cell gap uniform, Since the tip is linearly projected from the display part that intersects with the transparent electrode and the long pseudo electrode part is not continuous at the end as in the past, it occurs from the cold cathode tube installed side by side Less susceptible to electromagnetic waves. Therefore, the display becomes clearer and more accurate, and an excellent effect is obtained in improving the quality of the liquid crystal display element.

[Brief description of drawings]

FIG. 1 is a simplified plan view of a liquid crystal display element.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is an enlarged view of part B of FIG. 1 according to an embodiment.

FIG. 4 is an enlarged view of part B in FIG. 1 in a conventional example.

[Explanation of symbols]

 1, 2 glass substrate 3,4 transparent electrode 3a, 4a display part 3b, 4b lead-out part 3c, 4c terminal part 3d, 3e, 3f pseudo electrode part

Claims (1)

[Claims] 1. A liquid crystal display device in which a liquid crystal is sandwiched between two glass substrates having transparent electrodes formed thereon, and the other end of the one transparent electrode is continuous with a connecting terminal part through a lead part having one end bent. Is linearly extended from the display portion intersecting with the transparent electrode on the other side, and a pseudo electrode portion having an equal area is formed at the tip of each transparent electrode.