JPS5912419A - Negative display liquid crystal display element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display element that performs negative display.

In recent years, a liquid crystal display element that displays a negative image has been used as a component of a film printing mechanism built into a camera. In this device, it is generally required that the light shielding ability of the parts other than the display pattern portion be close to 700, but the light shielding ability of the normal polarizing plate orthogonal Nicol ζ alone cannot sufficiently satisfy this requirement. I couldn't do it.

The present invention uses a self-φ alignment method to form a mask pattern on the same surface as the transparent ['' electrode. This eliminates the conventional drawbacks and provides good light shielding for areas other than the display pattern area.
The present invention provides a liquid crystal display element that does this.

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 (1) to (5) are cross-sectional views showing the process of forming transparent electrodes and mask patterns by the self-alignment method.

/ is one glass substrate constituting the liquid crystal display element;
As shown in FIG. 1, a transparent conductive film 2 for a transparent electrode is formed on one side. 3 is a resist coated on the transparent conductive film 2 as shown in FIG. 1(2) in correspondence with the transparent electrode pattern, and the transparent conductive film 2 other than the resist 3 portion is removed by etching. Etching will be described later, but as is clear from FIG. 7(3), the etching is done in an over-etched state.

Using a mask metal such as A, a mask pattern is formed from the state shown in Figure 1 (4) using the lift-off method (Figure 1 415).
A substrate with a mask pattern formed on the same surface as the transparent electrode implementation surface is obtained.

In order to improve the positional accuracy of the transparent electrode pattern and the mask pattern, it is advantageous for the masking surface to be the same surface as the transparent electrode surface. Therefore, the transparent electrode pattern and the mask pattern can be formed on the same surface.

When masking is performed on the surface opposite to the transparent electrode implementation surface, there is a drawback that the display and the mask pattern may be observed to be shifted from each other by the thickness of the glass substrate depending on the direction in which the display is observed.

As the mask material, inorganic materials such as metals with high patterning accuracy are advantageous.

Note that it is proposed that a metal mask and a transparent electrode pattern be laminated and formed on one side of a glass substrate. In this case, for example, if you put an umbrella or a metal mask on the common electrode side, in the case of static drive, there is no need for leakage countermeasures because there is only one common electrode, but in the case of dynamic drive, the common electrode and metal mask are not required. It is necessary to take measures against leaks between the two.

At this time, an insulating film to prevent leakage is formed between the metal mask and the transparent single-pole pattern, and is made of a thin film that is colorless and transparent and does not adversely affect the optical characteristics of the liquid crystal. The selection is extremely difficult because it is thick and requires perfect insulation.

In this example, as mentioned above, if the transparent electrode is finished in an over-etched state by etching using the self-alignment method, it is possible to easily prevent leakage between the transparent electrode pattern and the mask pattern, which is very effective. Useful.

FIG. 2 shows a front view of a liquid crystal display element subjected to negative pattern masking. S and 6 are terminal parts, and the diagonal line part g is negative pattern masking.

In this case, the parts other than the display pattern part have a high Iqf % of 7 using the metal mask for the mask (see question 1).
shielded. In addition, in this proposal, since the mask pattern is formed on the same surface as the transparent F3A electrode implementation surface and other than the transparent electrode pattern, depending on the pattern formation of the common electrode and segment electrode, both the glass on the common electrode side and the segment electrode side may be formed. It is necessary to mask the substrate. The same applies when there is a wiring line for connection other than the transparent electrode pattern and it is desired to completely mask this line. In any case, masking can be easily performed using the self-alignment method in the present invention.

As described above, the present invention makes it possible to create a highly accurate patterning metal mask such as Cr on the same glass substrate surface as the transparent electrode without having to worry about insulating film problems in laminated structures. Therefore, it is possible to provide a useful negative display liquid crystal display element with high positional accuracy and high light shielding ability in areas other than the display pattern portion.

[Brief explanation of the drawing]

FIG. 1 (11-(5)) is a front view of a transparent electronic crystal display element in one embodiment of the present invention. /...Glass substrate, -...Transparent conductive film, 3...
Resist, G...metal for mask, Z...nekaha turn masking.

Claims (1)

[Scope of Claims] I. A negative display liquid crystal display element, characterized in that a transparent electrode pattern and a metal mask pattern are formed on the same surface of a glass substrate constituting an element by a self-alignment method. 2. Bringing the transparent electrode pattern into an overetched state,
2. A liquid crystal display element according to claim 1, characterized in that measures are taken to prevent leakage between the transparent electrode pattern and the metal mask pattern.