JPS63172124A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To permit control of the spacing between upper and lower substrates to a desired value by arranging plural pieces of metal wirings intersecting with the sealing part on the specific side between the upper and lower substrates of a liquid crystal cell by distributing the adjacent spacings between the same nearly evenly over the entire length of the sealing part on said side. CONSTITUTION:Plural pieces of the metal wirings 2 intersecting with the sealing part on the specific side of the liquid crystal cell are arranged by distributing the adjacent spacings between the same nearly evenly over the entire length of the sealing part 1 on side regardless of the disposition of transparent electrodes 5 for display arranged irregularly on the display surface. The display element, in the case of a chip on LCD (liquid crystal), is constituted of the transparent electrodes 5 for display consisting of ITO transparent conductive films and an LSI chip for driving the liquid crystal display element. The length of the sealing part and the number of the metal wirings in the drawing-out part are the same. The drawing- out parts of the metal wirings are disposed so as to correspond to the positions where the transparent electrodes for display are disposed. The pressure to be exerted between the upper and lower substrates is thereby uniformly acted on the respective parts over the entire surface of the substrates. The spacing sizes between the upper and lower substrates are thus maintained uniformly and correctly maintained at desired values at any point. The generation rate of the uneven color defect of the liquid crystal display element is thereby greatly lowered.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid crystal display element in which metal wiring used for power supply intersects with a sealing part of a liquid crystal cell, in which color unevenness is less likely to occur. Regarding.

[Conventional technology]

Some liquid crystal display elements use metal wiring in the peripheral area of the liquid crystal cell where it does not interfere with display because it is difficult to be electrolytically corroded, has low electrical resistance, and can be directly soldered. In particular, it is widely used in so-called chip-on LCDs in which an LSI for driving a liquid crystal display element is mounted on one substrate of a liquid crystal cell.

For example, in the case of a chip-on LCD, in order to improve moisture resistance, wiring made of an ITO transparent conductive film that is susceptible to electrolytic corrosion should not be exposed outside the liquid crystal cell, and should be placed inside the liquid crystal cell around the display area so that it does not interfere with the display. Then, connect the transparent conductive film wiring to the metal wiring and pull it out of the liquid crystal cell. Naturally, such metal wiring crosses the liquid crystal cell sealing section. These metal wirings have a metal film thickness of 5000 Å or more, and conventionally, they were drawn out at uneven intervals across the liquid crystal cell sealing portion at various locations mainly for convenience of wiring. In such a conventional structure, it is difficult to control the extremely small gap between the upper and lower substrates of the liquid crystal cell to the correct size, and there is a problem in that it is likely to cause so-called color unevenness.

Fig. 2 is a side sectional view showing an example of the sealing part of a conventional liquid crystal display element in which metal wiring is drawn out at uneven intervals across the sealing part of the liquid crystal cell, and in the figure, 1 indicates the sealing part. , 1a is a sealing material, 2 is a metal wiring, and 4 is a transparent substrate. In this example, four metal wires 2 are arranged at narrow intervals on the left side of the figure,
On the right side of the figure, two metal wires 2 are arranged at a wide interval. As shown in the figure (the gap size between the upper and lower substrates is d, > d2. Even if relatively rigid glass is used as the substrate material, a glass plate that is not very thick is surprisingly easy to bend, and This seems to be due to the fact that the paste-like sealing material, which appears to have high fluidity, has a surprisingly strong resistance to pressure when such small dimensions (on the order of μm) are a problem.

Regarding the lead wires of a liquid crystal display element, Japanese Patent Application Laid-Open No. 157619/1983 discloses that a fixing frame is provided in a part of the pin connector for external circuit connection of the liquid crystal display element to improve the dimensional accuracy of the spacing between the pin connectors. When bonding the upper and lower substrates of a liquid crystal display element made of flexible polymer films, the parts (sides) where the electrodes are drawn are glued with adhesive, and the remaining parts (sides) are glued using ultrasonic waves. JP-A-57-197520 discloses that in order to correctly guide a film to a predetermined working position on a film substrate used in a liquid crystal display element using a film substrate, it is possible to simply bend the film used for the substrate. It was discovered in 156222/1983 that holes, grooves, and protrusions were provided for guides.
However, there is no proposal for countermeasures against the non-uniformity of the gap size between the upper and lower substrates caused by the arrangement of the metal lead wires in the sealing portion, as described above.

[Problem that the invention seeks to solve]

The present invention solves the problems that have arisen in conventional liquid crystal display elements that use metal wiring as lead wires connected to transparent display electrodes that are disposed unevenly on the display surface, as described above. It is an object of the present invention to provide a liquid crystal display element in which the size of a minute gap between upper and lower substrates can be easily controlled to a correct desired value.

[Means for solving problems]

In order to solve the above problems, in the present invention, a plurality of metal wirings intersect with the sealing part on a specific side of the liquid crystal cell, regardless of the arrangement of transparent display electrodes arranged irregularly on the display surface. are arranged so that the adjacent intervals are almost evenly distributed over the entire length of the sealing part on the side concerned.

[Effect]

By taking the above measures, in the process of sealing the liquid crystal cell and at the same time setting the gap size between the upper and lower substrates of the liquid crystal cell to the desired value, the pressure applied between the upper and lower substrates can be applied evenly to each part of the entire surface of the substrate. As a result, the gap size between the upper and lower substrates uniformly becomes the desired value everywhere.

〔Example〕

FIG. 1 is a top view showing an example of a chip-on LCD embodying the present invention. In the figure, 5 is a display transparent electrode made of an ITO transparent conductive film, which is arranged at various intervals, and 3 is a top view showing an example of a chip-on LCD embodying the present invention. The LSI chip for driving the liquid crystal display element and other symbols are the same as in FIG. 2. Note that the broken lines in the figure indicate bonding wires. In this example, the thickness of the metal wiring is 60 mm.
00 people. In addition, in this example, the length of the sealing part is 80t.
120 metal wires were arranged at equal intervals. By implementing the present invention, the length of the sealing part and the number of lead-out metal wires are the same as in this embodiment, and the lead-out positions of the metal wires are arranged corresponding to the positions where the display transparent electrodes are arranged. Compared to conventional liquid crystal display devices in which the color distribution is uneven, color unevenness defects can be reduced by 30%.

In addition, on the side that is perpendicular to the side where a large number of metal wirings are arranged, and where the metal wiring is not drawn out, the sealing material flows and deforms relatively easily. Whether or not it extends to the side without the leader line (near both ends of the side with the leader line),
A similar effect can be obtained.

[Effects of the Invention] As explained above, according to the present invention, it is possible to significantly reduce the incidence of color unevenness defects in liquid crystal display elements led out by metal wiring.

[Brief explanation of the drawing]

FIG. 1 is a top view of an embodiment in which the present invention is applied to a chip-on LCD, and FIG. 2 is a side sectional view of a conventional liquid crystal display element sealing portion having lead lines made of metal wiring. 1- sealing part, la- sealing material, 2- fully bent wiring, 3- L
SI chip, 4-Glass substrate, 5-Transparent electrode for display.

Claims (1)

[Claims] 1. In a liquid crystal display element that uses metal wiring to supply power to transparent display electrodes arranged at irregular intervals, multiple metal wirings that intersect with the sealing part on a specific side between the upper and lower substrates of the liquid crystal cell are used. 1. A liquid crystal display device characterized in that the liquid crystal display device is arranged such that adjacent intervals are approximately evenly distributed over the entire length of the sealing portion on the side.