JPH0398082A - Liquid crystal display panel - Google Patents

Abstract

PURPOSE:To prevent a metallic film from peeling when an electrode terminal part is cut by forming an uneven part at the cutting position of the electrode terminal part and a substrate surface near it and arranging the electrode terminal across the uneven part. CONSTITUTION:The uneven part 13 is formed at the cutting position of the electrode terminal part 14 and on the surface of the substrate 12 near it and the electrode terminal part 14 is arranged across the uneven part 13. Thus, the uneven part 13 is provided at the cutting position and the surface of the substrate 12 inside it and then the metallic film 15 is formed to increase the area of contact between the metallic film 15 and the surface of a substrate 12, thereby increasing the adhesive strength of the metallic film 15 at the part. Consequently, when the electrode terminal part is cut, the metallic film is prevented from peeling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a matrix type liquid crystal display panel, and particularly to the structure of electrode terminal portions.

[Conventional technology]

Matrix-type liquid crystal display panels are used in information terminals and the like, taking advantage of the characteristics of liquid crystal display panels such as low voltage and low power consumption.

This matrix type display panel has an upper substrate with multiple lines of vertical electrodes and a lower substrate with multiple lines of horizontal electrodes, or an upper substrate with a common electrode and multiple lines of vertical electrodes. It consists of a lower substrate on which electrodes and horizontal electrodes intersect, and a number of electrode terminals corresponding to the vertical and horizontal electrodes of the display section are arranged around the outer periphery of the liquid crystal display panel, making it possible to create a dense matrix display. As the pattern increases, the number of lines increases and the pattern becomes finer.

FIG. 3 is a diagram showing an electrode terminal portion of a conventional liquid crystal display panel. A sealing material layer 33 is used to seal between the upper substrate 31 on which the upper electrode is formed and the lower substrate 32 on which the lower electrode and the lower electrode terminal part 34 are formed, and after sealing the liquid crystal material inside, the electrode terminal part 34 is sealed. The conductive portion 35 provided at one end is cut to complete the liquid crystal display panel.

The electrode terminal section 34 can be cut by inserting a scribe line on the back surface of the lower substrate 32 at the cutting position and then bending the scribe line so as to apply tensile stress, or by cutting the lower substrate 32
After a scribe line is placed on the surface at the cutting position, the scribe line is bent so that tensile stress is applied to the scribe line. However, when cutting the lower substrate 32, the electrode terminal portion 34
Stress is also applied to the metal film that forms the cut, and the metal film peels off near the cutting location.

[Problem to be solved by the invention]

In the conventional liquid crystal display panel described above, when the electrode terminal section is cut, the metal film forming the electrode terminal section peels off, damaging the electrode terminal section and causing a connection failure with the external circuit, reducing the reliability of the product. It has the disadvantage of having a serious negative impact on sexuality.

An object of the present invention is to provide a liquid crystal display panel in which the metal film forming the electrode terminal portion does not peel off when the electrode terminal portion is cut.

[Means to solve the problem]

In the liquid crystal display panel of the present invention, a sealing material layer is formed between opposing electrode substrates, and after both electrode substrates are held at a constant gap and bonded, one end of a plurality of electrode terminal portions protrudes from the sealing material layer. In the liquid crystal display panel formed by cutting the
An uneven portion is provided on the surface of the substrate at and in the vicinity of the cutting position of the electrode 8i14 child portion, and an electrode terminal portion is provided across the uneven portion.

[For production]

By forming a metal film after providing uneven parts at the cutting position and on the substrate surface inside the cutting position, the adhesion area between the metal film and the underlying surface increases, the adhesion strength of the metal film in this area increases, and the metal film peeling is prevented.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Figure 1(a). (b) and (c) are the first
FIG. 3 is a partial schematic diagram of the cutting position of the electrode substrate of the electrode terminal portion of the liquid crystal display panel of the embodiment and the substrate with the uneven portion 13 formed inside the cutting position.

As shown in FIG. 1(a), the surface of the lower substrate 12 is patterned using a photoresist method, and then etched with a 1:100 diluted hydrofluoric acid aqueous solution.
A concavo-convex portion 13 of μ is formed.

Next, as shown in FIG. 1(b), a metal chromium film of 1200 mm is formed on the surface of the lower substrate 12 by sputtering, patterned by a photoresist method, and then etched. 1) to form electrode terminal portions 14 and conductive portions 15. Further, an ITO (indium tin oxide) film is deposited by a sputtering method and etched to form a display electrode (not shown). Next, a sealing material layer 16 mixed with a substrate material is placed around the display electrodes of the lower substrate 12, and the sealing material layer 16 is overlapped with the upper substrate 11 and pressure is applied to bond the upper substrates 11 and 12 with the sealing material layer 16. After filling the formed liquid crystal cell with a liquid crystal material, the injection hole is sealed. Finally, as shown in FIG. 1(C), a scribe line is placed on the back surface (the surface is provided with an uneven portion 13) of the cutting position of one end of the electrode terminal portion of the lower substrate 12, and then the scribe line is A tensile stress is applied to the conductive portions 15 to separate them, and the liquid crystal display panel of this example is completed.

Figure 2(a). (b) and (c) are the second
FIG. 3 is a partial schematic diagram of the cutting position of the electrode substrate of the electrode terminal portion of the liquid crystal display panel of Example 1, and the substrate on which uneven portions 23 are formed inside the cutting position.

As shown in FIG. 2(a), silicon nitride II5!30 is deposited at 6000A on the surface of the lower substrate 22 by plasma CVD.
After formation and patterning using a photoresist method, etching is performed to form a 600 OA uneven portion 23 at the cutting position of the electrode terminal portion 24.
form. Next, FIG. 1(b) of the first embodiment.
Similarly to (c), the upper and lower substrates 21.2 are coated with the sealing material layer 26.
After filling the liquid crystal cell formed by gluing 2 together with a liquid crystal material, a scribe line is placed on the back surface (the surface is provided with an uneven portion 23 of silicon nitride film) at the cutting position of one end of the electrode terminal portion of the lower substrate 22. After applying tensile stress to the scribe line, the conductive portion 25 is separated to complete the liquid crystal display panel of the second embodiment.

In the formation of the uneven portions 23 of the silicon nitride film 30 in this second embodiment, a dry method can be used for patterning etching, which has the advantage that there is no damage to the back surface and that an undercoat film applied to the substrate surface can be used. .

(Effects of the Invention) As described above, the present invention uses a substrate in which an uneven portion is provided at the cutting position of one end of the electrode terminal portion and on the surface of the substrate inside the cutting position, and the electrode terminal portion is formed so as to cross the uneven portion. By forming a protective metal film, the adhesion area between the metal film and the underlying surface is increased, and the adhesion strength of the metal film in this area is increased to prevent peeling of this area when cutting the electrode terminal part. Therefore, the manufactured liquid crystal display panel has no connection failures with external circuits and has high wiring reliability.
This has the effect of providing a liquid crystal display panel with excellent display quality.

[Brief explanation of drawings]

Figure 1 (a), (b). (c) is the first aspect of the present invention.
A partial cross-sectional view of a liquid crystal display panel using the substrate of the example,
Figure 2(a). (b). (c) is the second aspect of the present invention.
A partial cross-sectional view of a liquid crystal display panel using the substrate of the example,
FIG. 3 is a partial sectional view of a liquid crystal display panel using a conventional substrate. ]1, 21.31-----Top substrate, 12.22.3
2----Lower substrate, 13.23...... Uneven portion, +4.24.34... Electrode terminal portion 15, 2
5.35... Continuity part, +6.26.33...
・・・Seal material layer 30・・・・・・・・・・・・・・・
Silicon nitride film.

Claims (1)

[Claims] 1. Form a sealing material layer between opposing electrode substrates, hold both electrode substrates with a certain gap and bond them together, and then cut one end of a plurality of electrode terminals protruding from the sealing material layer. A liquid crystal display panel characterized in that an uneven portion is provided on the surface of the substrate at and in the vicinity of the cutting position of the electrode terminal portion, and the electrode terminal portion is disposed across the uneven portion. .