JPH02222925A - Production of liquid crystal panel - Google Patents

Abstract

PURPOSE:To shorten a time necessary for inspection by impressing voltage on a pullout electrode after holding liquid crystal between substrates and performing lighting inspection. CONSTITUTION:A display pattern 3 necessary for four liquid crystal panels, the pullout electrode 4 and a pull-around electrode 5 for electrically connecting them are formed of transparent electrodes in a pattern on glass substrates 1 and 2 after washing the substrates, and an orientation film is formed. In the case, after sealing the liquid crystal between the glass substrates 1 and 2, voltage is impressed on the pullout electrode 4 by an inspection device 8 so as to inspect whether a defect such as a pin hole, etc., exists in a lighting pattern 9 and whether non-lighting caused by the disconnection of the transparent electrode occurs. Even if short circuit occurs in the transparent electrode, the inspection is performed from the lighting state by the use of the inspection device 8 or by visual observation. Thus, the time necessary for the inspection is shortened.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for manufacturing a liquid crystal panel.

Conventional technology In general, LCD panels are thin, have a small volume, and consume little power.
Due to these reasons, it has come to be widely used as a display device in everything from calculators to household electrical appliances and electronic devices.

Conventionally, this is the method of manufacturing this liquid crystal panel.

(IL) Two large-area substrates on which multiple display patterns are formed are glued together via a sealant to form multiple liquid crystal panels, and after cutting and dividing into individual liquid crystal panels, the liquid crystal is placed between the substrates. After that, a voltage is applied to the liquid crystal panel and a lighting test is performed.

(b) bonding two large-area substrates on which a plurality of display patterns are formed in the same manner as in (a) above via a sealing material;
After filling the liquid crystal, it is cut and divided into individual liquid crystal panels, and then a lighting test is performed.

(0) Similar to ia) and (b) above, two large-area substrates on which multiple display patterns are formed are bonded together in a vacuum via a sealant, and at the same time, a liquid crystal is placed between the two substrates. Seal and then divide and cut into individual LCD panels.
Perform lighting inspection.

Such methods have been adopted.

Problems to be Solved by the Invention In such conventional methods, tIL+ (bl +
(c) In either method, an extremely long amount of time was required for the inspection because each liquid crystal panel was inspected after being cut and divided into individual liquid crystal panels. Furthermore, since the terminal electrode patterns of liquid crystal panels differ depending on the type, it is necessary to prepare inspection jigs for every five types when applying voltage to the liquid crystal panel during inspection. Furthermore, in liquid crystal panels and the like that display dot patterns, the pitch of terminal electrodes is very small, making alignment with an inspection jig extremely difficult.

The present invention solves the problem of such gaps, and does not require inspection jigs for each type of product.Also, alignment between the liquid crystal panel and the inspection jig is easy, and many liquid crystal panels can be inspected at the same time. The purpose is to make it possible to

Means for Solving the Problems The technical means of the present invention for solving the above problems is to electrically connect a plurality of display patterns and other extraction electrodes with transparent electrodes or conductive resin, After the liquid crystal is sandwiched between the two substrates, a voltage is applied to the lead-out electrodes to perform a lighting test, and then the liquid crystal panels are cut and divided into individual liquid crystal panels.

If the liquid crystal spring μ is manufactured by the method described above, by unifying the pattern shape of the extraction electrodes, it is possible to use one inspection jig for many different types, and it is also possible to reduce time lost due to changing types in the inspection process. In addition, a liquid crystal panel with a small pitch of terminal electrodes can be easily aligned with the inspection jig, greatly improving productivity. Furthermore, when a multi-chip substrate is used, a plurality of liquid crystal panels can be tested for lighting at the same time, and the time required for the test can be significantly shortened.

Example Examples of the present invention will be described below.

(Example 1) Fig. 1 shows a manufacturing process according to an embodiment of the present invention, and Fig. 2 a and b are views showing glass substrates 1 and 2 used in the present invention. After the substrate is cleaned,
A display pattern 3 required for four liquid crystal panels, a separately provided bowed electrode 4, and a lead-out electrode 5 for electrically connecting them are patterned using transparent electrodes. After this, an alignment film is formed.

On one glass substrate 1 patterned in this way, a third
A sealing material 6 is formed as shown in Figure a.

At this time, an ultraviolet curing resin is used as the sealing material 6, and the sealing material e is formed by screen printing. The liquid crystal material 7 is precisely dropped onto the glass substrate 2 as needed.

The two glass substrates 1 and 2 on which the sealant 6 and the liquid crystal material 7 have been formed in this way are attached to the sealant 6. The liquid crystal materials 7 are placed in a vacuum device so as to face each other, and the inside of the vacuum device is f1. After evacuation to OTorr, two glass substrates 1.2 are bonded together in a vacuum apparatus, and then taken out into the atmosphere.

After that, the sealing material 6 is irradiated with ultraviolet rays to harden the sealing material 6.

After the liquid crystal is sealed between the two glass substrates 1 and 2 in this manner, the four liquid crystal panels are tested for lighting through polarizing plates, as shown in FIG. That is, a voltage is applied to the extraction electrode 4 by the inspection device 8, and the lighting pattern 9 is inspected for defects such as pinholes or non-lighting due to disconnection of the transparent electrode. Also, even if there is a gap between the transparent electrodes, it can be inspected by checking the lighting condition using an inspection device or by visual inspection.

After that, it is cut and divided into individual liquid crystal panels, and polarizing plates are attached to complete the liquid crystal panel.

(Example 2) Figures 6 and 6 show examples of the pond of the present invention, in which the extraction electrode 4 and the display pattern 3 are connected via a conductive material when it is not possible to wire them on a single glass substrate. be.

In this embodiment, a sheet material and a liquid crystal are formed on one glass substrate 1, and a conductive material 10 is formed on the other glass substrate 2 by screen printing. Here, mug paste was used as the conductive material 1o.

After that, as in Example 1, each glass substrate 1.
2 are bonded together in a vacuum, and the sealing material 6 is cured by irradiation with ultraviolet rays. Further harden the mug paste in an oven set at the temperature required to make the 5 g paste.

Thereafter, in the same manner as in Example 1, the extraction electrodes 4 and the inspection device 8 are connected, the two liquid crystal panels are inspected simultaneously, and finally they are divided.

(Embodiment 3) FIG. 7 shows an embodiment of the pond of the present invention, in which the pattern of the routing electrodes 6 is dense.

In this embodiment, a sealing material and liquid crystal are formed on one glass substrate 1, and a conductive material 11 is formed on the other glass substrate 2.

Here, the conductive material used is an ultraviolet curable resin mixed with styrene resin particles whose surface is nickel plated.

Thereafter, in the same manner as in Example 1, each glass substrate 1
．． 2 are bonded together in a vacuum, and the sealing material and conductive material are cured by irradiation with ultraviolet rays. Thereafter, the extraction electrode 4 and the inspection device 8 are connected to inspect the liquid crystal panel. Here, the reason for using a resin in which conductive particles are mixed as the conductive material will be explained. As in this embodiment, the lead-out electrode 5
When the pattern is dense, the conductive material is required to connect only the upper and lower electrodes without shunting adjacent electrodes. However, when the pattern is dense as in this example, It cannot be used because the upper and adjacent electrodes are seated with 5g base or carbon paste. FIGS. 8a and 8b are cross-sectional views after bonding the glass substrates in this example,
As is clear from FIGS. 8a and 8b, if the resin 13 mixed with the conductive particles 12 is used as the conductive material 11, they will be adjacent to each other! Only the upper and lower electrodes can be connected without cutting the poles. For these reasons, this embodiment uses a conductive material in which conductive particles are mixed into a resin.

In addition, even when the electrode terminal pitch of the display pattern is small as in this example, by forming the inspection wiring on the glass substrate, the number of lead-out electrodes can be extremely small, making inspection and treatment easier. Positioning with the tool becomes easier.

(Example 4) Although the above Examples (1) to (3) are examples in which a plurality of liquid crystal panels are allocated to the board, it is not necessarily necessary to have a plurality of liquid crystal panels, and only one liquid crystal panel is allocated to the board. Even in such cases, according to the present invention, the positioning with the inspection jig can be performed very easily, so there is a great effect.

In this example, glass substrates 1 and 2 were different in shape and size so that the extraction electrodes would be exposed after the glass substrates were bonded together. Needless to say, by cutting the opposing glass substrates, glass substrates of the same size and shape can be used.

In this embodiment, an ultraviolet curing resin was used as the sealing material, but a thermosetting resin or the like may be used as long as it does not impair the characteristics of the liquid crystal material.

Effects of the Invention As described above, the present invention enables lighting inspection of multiple liquid crystal panels at the same time by inspecting the substrate holding the liquid crystal before cutting and dividing it into individual liquid crystal panels. The time required for this can be significantly reduced.

Furthermore, by unifying the pattern shape of the extraction electrodes, inspection jigs can be shared, and time lost due to product switching can be reduced.

Furthermore, even panels with a small pitch of terminal electrode patterns, such as a dot pattern display, can be easily aligned with the inspection jig, greatly improving productivity.

[Brief explanation of the drawing]

Fig. 1 is a manufacturing process diagram of a method for manufacturing a liquid crystal panel according to an embodiment of the present invention, and Fig. 2 a and b are plane views showing the t-pole pattern shape of the glass substrate used in an embodiment of the present invention. Figures 3a and 3b are plan views showing the formation of the sealing material and liquid crystal material of the same example, Figure 4 is an explanatory view explaining the inspection state of the same example, and Figures 5a and b are the main views. FIG. 6 is a plan view showing the electrode pattern shape of the glass substrate used in the embodiment of the pond of the invention, FIG. A plan view of a part of the glass substrate used to explain the shape of the electrode pattern, FIG. 7 is a plan view showing the formation of the conductive material in the same example, and FIG. FIG. 8 is an enlarged view of section B in FIG. 8a. 1.2...Glass substrate, 3...Display pattern, 4...Extraction electrode, 6...
Routing? ltFM, 1°... Conductive material, 11.
... Conductive material, 12 ... Conductive particles, 13
······resin. Name of agent: Patent attorney Shigetaka Awano and 1 other persons

Claims (4)

[Claims] (1) After sandwiching the liquid crystal between two substrates patterned in such a way that the electrodes of the display pattern necessary for multiple liquid crystal panels and the extraction electrodes provided as a part other than the display pattern are electrically connected. . A method of manufacturing a liquid crystal panel, in which a voltage is applied to the extraction electrode to test the liquid crystal panel for lighting, and then the liquid crystal panel is cut and divided into individual liquid crystal panels. (2) The method for manufacturing a liquid crystal panel according to claim 1, wherein the display pattern and the extraction electrode are electrically connected via a conductive resin. (3) The method for manufacturing a liquid crystal panel according to claim 1, wherein the display pattern and the extraction electrode are electrically connected via a conductive material in which conductive particles are mixed in a resin. (4) After sandwiching the liquid crystal between two substrates on which one panel's worth of display patterns and lead-out electrodes are formed, a lighting test is performed;
2. The method for manufacturing a liquid crystal panel according to claim 1, wherein the liquid crystal panel is then cut into one liquid crystal panel.