JPS6278532A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To obtain a liquid crystal display element of long life and high display quality by forming a transparent conductive film for static electricity shielding in a glass substrate side and a transparent insulating film in a transparent conductive film electrode for display side between inside of upper and lower glass substrates and the transparent conductive film electrode for display. CONSTITUTION:Transparent conductive films 2 for static electricity shielding are formed on the whole surface of the display section of glass substrates 1, and transparent insulating films 3 are formed on the whole surface excepting those places which conducts upper and lower transparent films 2 for shielding static electricity. Transparent conductive films are formed on the inner face of transparent insulating films 3, and transparent conductive film electrodes 4 for display are formed by pattern etching process. At the time of pattern etching, terminals for outside connection of transparent conductive films for shielding static electricity are also formed simultaneously. A conductive member 5 between transparent conductive films 2 for shielding static electricity inside of upper and lower glass substrates 1 is also formed using conductive paste.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a liquid crystal display that does not adversely affect the lifespan or display even when static electricity is accumulated on a glass substrate or when a strong electric field is applied from the outside. Related to display elements.

[Background of the invention]

As is well known, in a liquid crystal display element, liquid crystal is filled and sealed in a space formed by sealing the periphery of upper and lower glass substrates facing each other with a small distance between them. This method utilizes the phenomenon that when an electric field is generated between the display transparent conductive film electrodes formed on each side, the light transmittance of the area where the electric field is generated is different from that of the other areas.

Therefore, if static electricity is accumulated on the glass substrate regardless of the voltage applied to the display electrodes, an electric field will be generated between the upper and lower glass substrates at the location where the static electricity is accumulated.
Displays that were not intended by the user may appear, or exposure to a DC electric field for a long period of time may result in a shortened lifespan. Moreover, since glass substrates have good insulating properties, it is extremely difficult to remove static electricity that has accumulated (Utility Model Publication No. 58-1433).
Publication No. 8).

Polarizing films are attached to the outer surfaces of the upper and lower glass substrates to display information using the polarization properties of liquid crystal. When attaching or peeling off this polarizing film to a glass substrate, static electricity is often accumulated on the glass substrate.

In addition, static electricity may also be generated when a protective plate is placed further outside the polarizing film when it is incorporated into a display device.

Polarizing films are usually pasted and peeled off at LCD manufacturing plants, but if you are not aware that static electricity has accumulated during this process, continuous application of a DC electric field may shorten the lifespan or actually cause damage to the polarizing film. Because of the abnormal display, a non-defective product is mistaken for a defective product. Furthermore, as mentioned above, the removal of static electricity once accumulated on a glass substrate is by no means simple.

In addition, as a countermeasure against static electricity that may occur when incorporating display elements into a liquid crystal display device, there are examples in which transparent conductive films for static shielding are pasted on the outer surfaces of upper and lower glass substrates are already in use. In this case, the transparent conductive films on the outer surfaces of the upper and lower glass substrates must be connected externally, and the connection point is generally completely different from the display electrode terminal, so connection with external equipment is difficult. It gets complicated.

[Purpose of the invention]

It is an object of the present invention to prevent shortening of life and deterioration of display quality even if static electricity is generated on a glass substrate or a strong external electric field is applied for some reason, and moreover, it is easy to use when incorporated into a liquid crystal display device. An object of the present invention is to provide a liquid crystal display element that is easy to work with.

[Summary of the invention]

In order to achieve the above object, in the present invention, an electrostatic shielding layer is provided on the glass substrate side between the inside of each of the upper and lower glass substrates of a liquid crystal display element, between the transparent conductive film electrode for display, and over the entire display area of the glass substrate. A transparent conductive film is formed by intervening a transparent insulating film on the electrode side of the transparent conductive film for display, and furthermore, the transparent conductive N films for electrostatic shielding formed on the inner surfaces of the upper and lower glass substrates are connected to each other. It was decided to lead out to one terminal for external connection provided on one surface.

[Embodiments of the invention]

FIG. 1 is a sectional view of main parts of an embodiment of the present invention, in which 1 is a glass substrate, 2 is a transparent conductive film for electrostatic shielding, 3 is a transparent insulating film, 4 is a transparent conductive film electrode for display, and 5 is a transparent conductive film for shielding static electricity. 6 is a conductive member (formed with conductive paste) for connecting the transparent conductive films for electrostatic shielding formed on the inner surfaces of the upper and lower glass substrates, 6 is a sealing material for sealing around the liquid crystal enclosure space, 7 is a liquid crystal, 8 is a terminal portion, and 9 is a polarizing film. Although not shown, alignment films are formed on the upper and lower surfaces with which the liquid crystal directly contacts, in order to align the directions of the elongated liquid crystal molecules at the contact points in a predetermined direction.

The electrostatic shielding transparent conductive film 2 is formed on the entire surface of the display portion of the glass substrate 1. Further, the transparent insulating film 3 is also formed over the entire surface of the electrostatic shielding transparent conductive film 2 except for the portions where vertical conduction is established. A transparent conductive film is formed on the inner surface of the transparent insulating film 3, and a transparent conductive film electrode 4 for display is formed by a well-known pattern etching method. During this pattern etching, external connection terminals of the electrostatic shielding transparent conductive film 2 are also formed at the same time. The conductive member 5 between the electrostatic shielding transparent conductive films 2 on the inner surfaces of the upper and lower glass substrates 1 is also made of conductive paste, as in the case of the upper and lower conductive members for leading out electrodes to other display transparent conductive film electrodes 4. Form using. The other structure is the same as that of a conventional ordinary liquid crystal display element. The materials and manufacturing method are also the same as those of conventional elements.

In this way, a transparent conductive film for electrostatic shielding was formed immediately inside the upper and lower glass substrates, and a terminal for external connection of this film was provided, so this film can be grounded during the manufacturing process to prevent strong electrostatic fields. Negative effects can be avoided, and electrical connections with external equipment can be easily made when incorporating the liquid crystal display device.

〔Effect of the invention〕

As explained above, according to the present invention, it is not affected by electrostatic fields or external electric fields during or after manufacturing, has a long life,
A liquid crystal display element with good display quality can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention. 1-Glass substrate, 2-Transparent conductive film for electrostatic shielding, 3-
Transparent insulating film, 4...-Transparent conductive film electrode for display, 5-
Conductive member, 6-Sealing material, 7-Liquid crystal, 8-Terminal part,
9-・Polarizing film.

Claims (1)

[Claims] On the inside of each of the upper and lower glass substrates of the liquid crystal display element, between the transparent conductive film electrode for display, over the entire display area of the glass substrate, a transparent conductive film for electrostatic shielding is placed on the glass substrate side, and a transparent conductive film for display use is placed on the electrode side of the transparent conductive film for display. Intervening and forming a transparent insulating film, and further,
A liquid crystal display characterized in that transparent conductive films for electrostatic shielding formed on the inner surfaces of the upper and lower glass substrates are connected to each other and led out to one terminal for external connection provided on either surface of the glass substrate. element.