JPH06118425A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To provide uniform display on the entire plane of a panel in a liquid crystal display element requiring electrical continuity from a substrate on one side to the one on the other side. CONSTITUTION:Gap nonuniformity in the neighborhood of a display area can be eliminated by extending draw-out electrodes 5, 6 to a position in the neighborhood of the display area. Also, the draw-out electrodes 5, 6 are installed confronting with display electrodes 3, 4, respectively, and they are connected electrically by a conductive particle 9. Therefore, the holding interval of the substrate can be uniformalized extending over the entire plane of the panel, which provides the uniform display with high grade.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple matrix type liquid crystal display device.

[0002]

2. Description of the Related Art As a conventional technique, for example, Japanese Patent Laid-Open No. 62-2
According to Japanese Patent No. 29234, a dummy transparent electrode is provided in the peripheral portion of the lighting display area other than the routing line for external connection to make the gap between the liquid crystal layer in the lighting display area and the peripheral portion thereof uniform, and to provide color unevenness and contrast. Proposals for reducing unevenness have been made.

Further, as in Japanese Patent Laid-Open No. 58-220176, a dummy transparent electrode is provided in the peripheral portion of the lighting display area except for the wiring lines for external connection, and the dummy electrode is grounded or specified. A method of applying a voltage has also been proposed.

[0004]

However, Japanese Unexamined Patent Application Publication No. Sho 6
The method disclosed in JP-A-2-229234 has a drawback in that the dummy electrodes and the display electrodes malfunction due to static electricity because the dummy electrodes are electrically isolated.

In the method disclosed in Japanese Patent Laid-Open No. 58-220176, the dummy electrodes and the display electrodes can be prevented from malfunctioning, but the dummy electrodes are connected to an external circuit or a new conductive layer is provided. Therefore, there is a problem that the manufacturing cost is high.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a liquid crystal display device having high display uniformity without causing an increase in cost.

[0007]

A liquid crystal layer surrounded by a sealing material containing spacers is sandwiched between a signal electrode substrate having a plurality of signal electrodes and a scanning electrode substrate having a plurality of scanning electrodes. , Having an extraction electrode on one of the substrates, the extraction electrode being arranged at a position corresponding to each of the display electrodes of the substrates which face each other with the sealing material interposed therebetween, and the conductive material is mixed into the sealing material. Thus, the extraction electrode and the display electrode on the substrate opposite to each other are electrically connected to form a liquid crystal display element, and the extraction electrode is formed up to the vicinity of the display electrode.

[0008]

According to the present invention, by extending the extraction electrode close to the display electrode, it is possible to prevent unevenness in the gap in the peripheral portion of the display area and eliminate unevenness in contrast. Further, since the extraction electrode is installed to face the display electrode and is electrically connected by the conductive particles,
It does not malfunction due to static electricity. That is, a process for connecting the dummy electrode and the external circuit is unnecessary. Therefore, it is possible to provide a uniform liquid crystal display element having high display characteristics without increasing the manufacturing cost.

[0009]

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

1 (a) and 1 (b) are conceptual plan views of an electrode substrate in an embodiment of the present invention, and FIG. 2 is a sectional view of a lead electrode terminal portion of a liquid crystal display element in the embodiment. ing.

First, a signal electrode substrate 2 in which the extraction electrode 5 was brought close to the signal electrode group 4 and a scanning electrode substrate 1 in which the extraction electrode 6 was brought close to the scanning electrode group 3 were prepared. The inter-electrode distance d12 between the extraction electrodes 5 and 6 and the signal electrode group 4 and the scanning electrode group 3 is
It was 0.5 mm. Next, as a sealant 7 on the scanning electrode substrate 1, a spacer 8 for maintaining an electrode gap (glass fiber having an average particle size of 7.0 μm) in a thermosetting epoxy resin is 1.5 wt%.
Then, 1.0 wt% of conductive particles 9 (polystyrene particles having an average particle size of 7.25 μm on which a gold plating layer having a thickness of 0.1 μm was formed on the surface) was mixed and printed by a screen printing method.

Further, an alignment film (not shown in the drawing) and an appropriate number of spacers 10 are sandwiched between two electrode substrates,
The spacer 8 and the conductive particles 9 are pressed and compressed until they have the same size, and the conductive particles 9 electrically connect the upper and lower electrodes, and then the sealing material 7 is cured. By this step, the scanning electrode group 3 and the extraction electrode group 5 provided on the signal electrode substrate 2, and the signal electrode group 4 and the extraction electrode group 6 provided on the scanning electrode substrate 1 are electrically connected, respectively. Then, the liquid crystal 11 was injected into the gap between the electrode substrates 1 and 2 surrounded by the sealing material 7, and then the liquid crystal injection port was sealed with an ultraviolet curable resin to manufacture a liquid crystal display element.

When the gap uniformity of the liquid crystal display device manufactured as described above was evaluated, it was found that the entire surface of the panel including the periphery of the display area was uniform. As a result of performing lighting display evaluation, it was confirmed that a liquid crystal display element having high uniformity was manufactured. However, such a uniform display could not be obtained in a panel in which the extraction electrode is not extended to the vicinity of the display area as in the conventional case.

In this embodiment, a thermosetting type is used as the sealing resin material 7, but it can be realized by using an ultraviolet curing type resin. Furthermore, although only the screen printing method has been described as the forming method, other methods (for example, application by a dispenser or flexographic printing method) are also possible.

Any material may be used as the conductive particles 9 as long as it has elasticity to some extent and its grain system distribution is small.

In this embodiment, the spacer 8 being sealed
Although the relationship between the spacer 10 in the cell and the spacer 10 in the cell is not mentioned, it is desirable that the spacer in the seal is larger than in the cell or the same.

[0017]

As described above, according to the invention, in the single-sided substrate extraction type liquid crystal display element capable of connecting the signal electrode and the scanning electrode to the external circuit on the same substrate, by extending the extraction electrode to near the display area, The distance between the liquid crystal layers sandwiched between the substrates can be made equal in all parts. Therefore, it is possible to eliminate the uneven lighting display due to the uneven thickness of the liquid crystal layer in the peripheral portion of the display area.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an electrode substrate that constitutes a liquid crystal display element according to an embodiment of the present invention.

FIG. 2 is a sectional view of a terminal portion configuration of a liquid crystal display element according to an embodiment of the present invention.

[Explanation of symbols]

 1 Scanning Electrode Substrate 2 Signal Electrode Substrate 3 Scanning Electrode Group 4 Signal Electrode Group 5, 6 Extraction Electrode 7 Sealing Material 8 Spacer 9 Conductive Particles 10 Spacer 11 Liquid Crystal 12 Distance Between Electrodes

Claims (2)

[Claims] 1. A liquid crystal layer surrounded by a sealing material containing a spacer is sandwiched between a signal electrode substrate having a plurality of signal electrodes and a scanning electrode substrate having a plurality of scanning electrodes,
Having an extraction electrode on at least one of the substrates,
The extraction electrodes are formed at positions corresponding to the display electrodes of the substrates facing each other with the sealing material sandwiched therebetween, and the display electrodes on the substrates facing the extraction electrodes by mixing conductive particles into the sealing material. A liquid crystal display element, wherein the liquid crystal display element is formed by electrically connecting to each other and the extraction electrode is formed up to the vicinity of the display electrode. 2. The distance between the extraction electrode and the display electrode is 2.0 mm.
The liquid crystal display device according to claim 1, wherein: