JPH0339720A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent the viewing of irregular colors and to prevent a malfunction as well by forming dummy patterns consisting of a transparent conductive film and providing the original external connecting terminals for grounding at the dummy patterns to ground the patterns independently from other electrode groups. CONSTITUTION:The dummy patterns 5 consisting of the transparent conductive film are formed, in addition to the patterns of the electrodes, feed paths, etc., necessary for display operations, even to the points on the inside surfaces of glass substrates 6, 7 where the disposition of the transparent conductive film for the purpose of the display effect alone is not required to prevent the remaining of the parts absent of the transparent conductive film on the inside surfaces of the substrates as far as possible except in the insulating spacings necessary for the operations of the respective patterns. The generation of the irregular colors is suppressed in this way. Since the dummy patterns 5 are grounded via the original external connecting terminals 4 for grounding, the fluctuation in the potential of the dummy patterns 5 does not arise even if these patterns receive noise. There is, therefore, no possibility of giving rise to such malfunction as abnormal lighting of the nearest display electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a matrix type liquid crystal display element in which the occurrence of five-color unevenness is suppressed and abnormal display does not occur.

[Prior Art] The transmittance of light and the reflectance of external light differ between areas where a transparent conductive film is formed on the inner surface of the substrate of a liquid crystal cell and those where it is not formed. However, since there is some coloring, the color becomes uneven when used, and the difference between the presence and absence of a transparent conductive film is visible. In transmissive liquid crystal display elements (Japanese Patent Publication No. 61-26668, etc.) used in combination with a backlight, a relatively thick transparent conductive film is formed because absorption of light by the transparent conductive film is not much of a problem. For this reason, in a backlight type liquid crystal display device, the color unevenness becomes noticeable because the transparent conductive film is thick, and becomes unsightly.

[Problems to be Solved by the Invention] It is an object of the present invention to provide a 1' display panel that solves the above-mentioned color unevenness, does not cause one color unevenness, and does not operate abnormally. .

[Means to solve the problem] In order to achieve the above object, the present invention provides.

To prevent partial differences in appearance color, that is, color unevenness, caused by the presence or absence of a transparent conductive film on the inner surface of the substrate,
In addition to the patterns of electrodes and connection lines necessary for display operation,
A dummy pattern that is necessary for the operation of each of these patterns was formed, and this transparent conductive film dummy pattern for preventing color unevenness was provided with its own external connection terminal for grounding, and it was grounded independently from other electrode groups. .

[Function] Since the transparent conductive film dummy pattern for preventing the occurrence of color unevenness is provided, the occurrence of color unevenness is naturally suppressed.

Moreover, each dummy pattern has its own external grounding terminal and is grounded independently from other electrode groups.
The phenomenon of noise being added to the dummy pattern does not occur. Therefore, abnormal malfunctions such as abnormal lighting of the scanning electrodes will not occur.

〔Example〕

In liquid crystal display elements used in backlight type liquid crystal display devices, electrodes and power supply necessary for display operation are placed on the inner surface of the glass substrate, even in places where it is not necessary to provide a transparent conductive film for display purposes only. In addition to patterns such as paths, a dummy pattern made of a transparent conductive film is formed so that as little as possible remains on the inner surface of the substrate where there is no transparent conductive film, except for the insulating gaps necessary for the operation of each of these patterns. Suppresses the occurrence of uneven color.

However, in the above color unevenness prevention technology, the dummy pattern for preventing color unevenness is connected to the nearest scanning electrode or signal electrode, and insufficient consideration is given to the effects of noise on the dummy pattern, causing the scanning line to turn on abnormally. There were problems such as.

FIG. 1 is an enlarged plan view of essential parts of an embodiment of the present invention. In the figure, 1 is an upper substrate transparent electrode (for example, a signal electrode), 2 is a lower substrate transparent electrode (for example, a scan electrode), 3 is an external connection terminal,
Reference numeral 4 designates a grounding external connection terminal unique to a dummy pattern newly provided according to the present invention, 5 is a dummy pattern, 6 is an upper substrate, 7 is a lower substrate, and 8 is an effective display area.

In this case, a dummy pattern 5 for preventing color unevenness is provided on the upper substrate 6 (there is no electrode on the corresponding part of the lower substrate since the display lighting function does not have to be performed).
This dummy pattern 5 is grounded via a unique grounding external connection terminal 4 according to the present invention. Therefore, even if the dummy pattern 5 receives noise, its potential does not fluctuate, and abnormal operations such as abnormal lighting of the nearest display electrode as in the conventional case do not occur.

[Effects of the Invention] As explained above, according to the present invention, color unevenness is not visible;
A liquid crystal display element with excellent display quality and no abnormal operation can be obtained.

[Brief explanation of drawings]

FIG. 1 is an enlarged plan view of essential parts of an embodiment of the present invention. 1... Upper substrate transparent electrode, 2... Lower substrate transparent electrode,
3... External connection terminal, 4... External connection terminal for grounding unique to the dummy pattern newly provided according to the present invention. 5...Dummy pattern, 6...Upper board, 7...
・Shimoki Diagram

Claims (1)

[Claims] 1. In addition to the patterns for electrodes and connection lines necessary for display operation, a dummy pattern made of a transparent conductive film insulated from the pattern is formed, and an external connection terminal for grounding is provided on this dummy pattern. element.