JPH05107547A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent deterioration in display quality by making joints due to divisional exposure hard to visually recognize. CONSTITUTION:On the liquid crystal display element which has a couple of opposite substrates, a couple of striped electrode groups 1 and 1' which are arranged on the opposite surfaces of those substrates while crossing each other when viewed from a display surface, and liquid crystal which is driven with voltages impressed through those striped electrode groups, and also has the striped electrode groups 1 formed on one or both the substrates by performing 42 divisional exposure at right angles to the length direction of the stripes at the time of pattern printing in a photolithographic process, the joints 4 due to the divisional exposure are arranged overlapping with non-display parts including parts 2' between picture elements as two striped electrodes 1' on the opposite substrate surfaces and opaque metallic members for reducing the electric resistance of the striped electrode 1'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display element in which a liquid crystal is sandwiched between a pair of substrates each having a striped electrode group, and more particularly a joint in the direction perpendicular to the stripe when forming a striped electrode group pattern. Is arranged so as to overlap the non-display portion on the counter substrate side where the striped electrode groups are arranged so as to intersect with each other,
The present invention relates to a liquid crystal display element in which a seam deviation due to mechanical precision cannot be visually recognized by human eyes.

[0002]

2. Description of the Related Art A liquid crystal display element is composed of a pair of substrates facing each other and a pair of striped electrodes formed on the facing surfaces of these substrates so as to intersect each other. In the photolithography process for forming such a striped electrode group, particularly in a high-definition liquid crystal display device having a display area of about 10 inches or more and a resolution of about 4 [pel] or more, when a pattern is printed by exposure,
A high resolution and, in some cases, a stacking precision at the time of stacking the opaque electrode members to reduce the electric resistance of the stripe electrode are required. Therefore, in order to satisfy the performance, for example, MPA-1500 (manufactured by Canon) The exposure device is formed by dividing and joining each stripe-shaped electrode group on both substrates in the orthogonal direction. The vertical seam to the stripes at this time is
Conventionally, they are arranged so as to overlap with each other on the stripe electrodes intersecting on the facing surface.

[0003]

However, in the above-mentioned conventional example, the liquid crystal is actually sandwiched, and the liquid crystal is driven and displayed by the voltage applied through the stripe-shaped electrode groups arranged so as to intersect each other. In this case, if the vertical seam of the vertical seams of the striped electrode groups on one or both substrates is large with respect to the mechanical precision stripes, it will appear on the display pixel and will be visible to the human eye. It has a drawback that it is visually recognized and deteriorates the display quality.

The present invention has been made in view of the problems in the above-described conventional example, and in a liquid crystal display element in which a pattern printing in a photolithography process for forming a stripe electrode group on a substrate is performed by a division exposure, the division is performed. It is intended to make it difficult to visually recognize a seam due to exposure and prevent deterioration of display quality.

[0005]

In order to achieve the above object, according to the present invention, a pair of substrates facing each other and arranged on the facing surfaces of the substrates so as to intersect each other when viewed from the display surface. A pair of striped electrode groups and a liquid crystal driven by a voltage applied through these striped electrode groups are provided, and each striped electrode group on the one or both substrates is subjected to pattern printing in a photolithography process. In a liquid crystal display element formed by performing two or more divided exposures in a direction perpendicular to the longitudinal direction of a stripe, a seam formed by the divided exposures has two stripe electrodes, which are stripe electrodes on opposing substrate surfaces. It is characterized in that it is arranged so as to overlap a non-display portion including a space.

In a liquid crystal display element having an opaque metal member for reducing the electric resistance of the stripe electrode, the non-display portion may further include the region of the opaque metal member.

[0007]

According to the present invention, when the stripe-shaped electrode group patterns are formed on one or both substrates, the deviations in the mechanical precision of the divisions (that is, the joints) in the direction perpendicular to the stripe direction cross each other. The two stripe electrodes on the side of the counter substrate (hereinafter referred to as "between pixels") arranged on the counter substrate so as to overlap with the non-display portion.
Even if the liquid crystal is driven and displayed, the mechanical deviation of the joint is prevented from appearing on the display pixel.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view of an electrode portion of a liquid crystal display device according to an embodiment of the present invention. In FIG. 1, 1 is a transparent electrode which is a pixel electrode, 2 is between pixels, and the first quadrant and the second quadrant
A seam shift 4a is generated at the seam 4 with the quadrant. Reference numerals 1'and 2'represent the transparent electrodes and pixels on the opposing substrate, and the seam 4 overlaps the pixel 2'on the opposing substrate. Here, each of the first quadrant and the second quadrant is a range where printing is performed by one exposure in the photolithography process. That is, this example shows a case where, for example, the first quadrant is exposed at the first time and the second quadrant is exposed at the second time.

FIG. 2 is a plan view showing the display pixel of FIG. In FIG. 2, the pixel group in the first quadrant and the pixel group in the second quadrant are displaced by 4a at the joint 4, but the joint 4 is a non-display portion, and the displacement is not visually recognized.

FIG. 3 shows an example of an electrode portion of a conventional liquid crystal display element, in which a joint 4 in the first and second quadrants overlaps a transparent electrode 1'of a counter substrate. FIG. 4 is a plan view showing the display pixel of FIG. In FIG. 4, since the seam shift 4a appears as it is in the pixel on the seam 4, it is visually recognized.

Here, FIGS. 1 and 2 show an example in which only the transparent electrodes are arranged and the seams overlap between the pixels of the opposite substrate. The same effect can be obtained by overlapping the seam with the non-display portion such as on the opposing metal electrode.

[0013]

Example 1 An example of the present invention will be described below.

Transparent electrodes (IT) were formed on two glass substrates of 300 × 320 × t1.1 (mm) by sputtering.
O) 1000 Å was deposited, and a striped electrode group was formed by using a photolithography technique. The exposure at this time was performed by 4-division exposure using MPA-1500 manufactured by Canon. The shape of the formed stripe electrode group is shown in FIG. In FIG. 1, the width of the transparent electrode 1 was 200 μm, and the width of the inter-pixel 2 was 20 μm. The seam deviation 4a was 2 μm.

The two glass substrates were bonded together so that one seam overlapped between the other pixels, and liquid crystal was sealed therein to form the liquid crystal display device shown in FIGS. 1 and 2. When the liquid crystal display device was driven, the four-divided joint was not visually recognized at all as shown in FIG.

[0016]

[Other Embodiments] FIG. 5 is an example of a plan view of an electrode portion of a liquid crystal display device according to another embodiment of the present invention.

In FIG. 5, metal electrodes 3 and 3'having low electrode resistance are formed in contact with the transparent electrodes 1 and 1'to be pixels. Here, the seam shift 4a in the seam 4 in the first quadrant and the second quadrant is not visible because it overlaps with the metal electrode 3 '(that is, the non-display portion) of the counter substrate.

The liquid crystal display device shown in FIG. 5 was prepared as follows. That is, a striped transparent electrode group having a thickness of 1500 Å was formed on each of two 300 × 320 × t1.1 (mm) glass substrates by the same method as in Example 1, and a metal electrode was also sputtered thereon. Al as 2000
Å was formed into a film, and a pattern was formed in the same manner as the transparent electrode. At this time, the width of the transparent electrode 1 is 250 μm, the width of the metal electrode is 30 μm, and the width between the pixels 2 is 10 μm.
Was 1.5 μm.

The two glass substrates were bonded together so that one seam overlaps the other metal electrode, and liquid crystal is sealed therein to form a liquid crystal display device shown in FIG. When the liquid crystal display device was driven, a four-divided joint was not visible at all.

[0020]

As described above, according to the present invention,
By arranging the seams in the vertical direction with respect to the stripes at the time of forming the stripe electrode group pattern so as to overlap the non-display portion on the side of the opposite substrate arranged so as to intersect with each other, even if the allowable range of the seam deviation is increased. Thus, it is possible to provide a liquid crystal display device without any deterioration in display quality.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of an electrode portion of a liquid crystal display element according to an embodiment of the present invention.

FIG. 2 is a plan view showing a display pixel of the liquid crystal display element of FIG.

FIG. 3 is a plan view showing an example of a plan view of an electrode portion of a conventional liquid crystal display element.

4 is a plan view showing a display pixel of the liquid crystal display element of FIG.

FIG. 5 is a plan view of an electrode portion of a liquid crystal display element according to another embodiment of the present invention.

[Explanation of symbols]

1: transparent electrode, 1 ': transparent electrode on the opposite substrate, 2: between pixels, 2': between pixels on the opposite substrate, 3: metal electrode, 3 ': metal electrode on the opposite substrate, 4: seam, 4a: seam deviation ..

Claims (3)

[Claims] 1. A pair of substrates facing each other, a pair of stripe-shaped electrodes arranged on the facing surfaces of the substrates so as to intersect with each other when viewed from the display surface, and via the stripe-shaped electrode groups. A liquid crystal driven by an applied voltage, and each stripe-shaped electrode group on one or both of the substrates is divided and exposed into two or more in a direction perpendicular to the longitudinal direction of the stripe during pattern printing in the photolithography process. In the liquid crystal display element formed by the above-mentioned method, the joint by the divided exposure is arranged so as to overlap a non-display portion including between two stripe electrodes of the stripe electrodes on the opposite substrate surface. Liquid crystal display device. 2. The liquid crystal display element according to claim 1, wherein the non-display portion further includes a region of an opaque metal member formed on and / or near the stripe electrode. 3. The liquid crystal display element according to claim 2, wherein the opaque metal member is for reducing the electric resistance of the stripe electrode.