JP3235618B2 - Liquid crystal display panel manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a liquid crystal display panel and an apparatus for manufacturing the same.

[0002]

2. Description of the Related Art As shown in FIG.
0 indicates an image display by controlling a voltage applied to each liquid crystal cell of each pixel at a position where a plurality of scanning signal lines 1a and video signal lines 2a intersect. Since defects occur due to various causes such as device destruction due to static electricity or static electricity, inspections are performed a plurality of times during the manufacturing process to prevent defective products from flowing out to subsequent processes. In particular, image display inspection after completion of the panel on which the liquid crystal cell is formed is important. As shown in FIG. 5, the inspection probe electrodes 1c are connected to all the electrodes 1b on which the driving LSIs of the scanning signal lines 1a are mounted, and the video signal lines are connected. The inspection probe electrodes 2c are brought into contact with all of the electrodes 2b on which the driving LSIs 2a are mounted, and the scanning signal wiring driving circuit 22 and the video signal wiring driving circuit 21b are respectively driven by signals from the liquid crystal display panel inspection control circuit 20. Is controlled to display an image on the liquid crystal display panel, and its quality is determined. Thus, it is indispensable to prevent the defective panel from flowing out into the subsequent liquid crystal driving LSI mounting process in order to reduce the loss cost and improve the productivity.

[0003]

However, as the number of pixels increases due to higher definition in order to improve the display quality, the distance between the mounting electrodes of the LSI for driving the liquid crystal becomes narrower. When the probe electrode is brought into contact with each of the video signal wiring and the scanning signal wiring as in the above configuration, the manufacturing cost is extremely high. In addition, the fabrication period becomes long, and the stability of the contact of the probe electrode and the maintenance of the probe electrode are very difficult. In particular, when a chip-on-glass method in which an LSI driver IC for driving a liquid crystal is directly mounted on a glass substrate is used, direct contact with an electrode pad becomes impossible. Among them, in particular, the number of video signal wirings is larger than that of scanning signal wirings, and defects are likely to occur during manufacturing.

Therefore, by connecting the video signal wiring to the common bus wiring, the inspection probe electrode and the inspection method can be simplified, but between the adjacent video signal wiring or between the adjacent scanning signal wirings due to some trouble. If a short circuit occurs, the entire LCD panel will display abnormally,
There is a problem that the image display due to the input of the inspection signal cannot be specified as a display abnormality of the liquid crystal display panel limited to the video signal wiring or the scanning signal wiring having a short circuit. Accordingly, it is an object of the present invention to provide a method of manufacturing a liquid crystal display panel which does not cause an abnormal display on the entire surface of the liquid crystal display panel even with the short circuit.

[0005]

According to a method of manufacturing a liquid crystal display panel of the present invention, a liquid crystal display panel has a plurality of video signal wirings and a plurality of scanning signal wirings, and each of the scanning signal wirings has a plurality of groups. is divided into, for have a plurality of common bus lines connected to each of the serial scanning signal lines.

[0006] One end portion of each of the video signal lines has an electrode for input of the video signal of the video signal lines, one end of each of the scanning signal lines has an electrode for the input of the scanning signals Wherein each of the common bus lines and the other end of each of the scanning signal lines has a resistor connected to each of the same groups, and further has an electrode pad at one end of each of the common bus lines. An inspection signal is input to each of the signal input electrodes and each of the electrode pads, and an image is displayed on the liquid crystal display panel .

Further, even if the adjacent scanning signal wiring is short-circuited, the resistance value of the resistor is such that display of an image due to the input of the inspection signal is limited to the scanning signal wiring having the short-circuit. And a resistance value that does not cause an abnormal display on the entire surface of the liquid crystal display panel due to the short circuit .

[0008] In addition, the lower limit of the resistance value of the resistor is at 1KΩ,
The upper limit value may be 90Keiomega.

[0009] In addition, the resistance of the resistance was cut with the cutting means, as well as open the connection of resistance to the common bus line
No.

A manufacturing apparatus having the above-described method for manufacturing a liquid crystal display panel may be used .

[0011] In this way, even when the short-circuit between the Tonarigo cormorant run scanning signal No. wiring, display of the liquid crystal display panel that the image display by the input of the test signal is limited to Oh Ru run scanning signal No. wiring of short abnormally It can be specified, and even if the above short circuit occurs, the entire display of the liquid crystal display panel does not become abnormal.Therefore, when inspecting the image display of the liquid crystal display panel, there is no problem even if there is a short circuit between the scanning signal wirings. The quality of the display panel manufacturing method can be improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display panel is provided with a common bus wiring connected to at least one of a plurality of video signal wirings and a plurality of scanning signal wirings. This is a method of inspecting a liquid crystal display panel for controlling image display, in which a common bus wiring is provided to supply an inspection signal.

In addition, a common bus line for connecting a plurality of video signal lines for each same color is provided.
By connecting a resistor for controlling voltage drop between at least one of the plurality of video signal wirings and the scanning signal wiring, and supplying an inspection signal to the common bus wiring to control the image display of the liquid crystal display panel, Defective portions of video signal wiring due to line defects can be specified.

Further, a common bus line connected to at least one of the plurality of video signal lines and the plurality of scanning signal lines is provided on the liquid crystal display panel, and an inspection signal is supplied to the common bus line to inspect the liquid crystal display panel. After that, the resistor of the resistor connecting the common bus wiring and the video signal wiring or the scanning signal wiring is cut off. The connection between the common bus wiring and the video signal wiring or the scanning signal wiring is cut off by cutting means. The cutting means of the resistor is performed by irradiating the resistor with a laser beam or the like.

Further, the substrate (glass panel) may be cut by cutting to disconnect the common bus wiring from the video signal wiring or the scanning signal wiring. Since the edge of the substrate (glass panel) is cut off, it is suitable for making the liquid crystal panel smaller.

(Embodiment) An embodiment of the present invention will be described. FIG. 1 is a schematic view of the configuration of a liquid crystal display panel for inspection. Note that the same components as those of the liquid crystal display panel shown in FIG. 3 are denoted by the same reference numerals, and detailed description will be omitted.

The liquid crystal display panel 8 shown in FIG. 1 is an example in which a liquid crystal display panel of an active matrix driving system is used. Liquid crystal is sealed between a pair of glass substrates and provided on one of the glass substrates. A plurality of scanning signal lines 1a and a plurality of video signal lines 2a provided on the other side between the counter electrode and the glass substrate; and a pixel electrode provided at a portion where the plurality of scanning signal lines 1a and the plurality of video signal lines 2a intersect. And common bus lines 3a, 4a, 5a connected to the plurality of video signal lines 2a or the plurality of scanning signal lines 1a.

Here, a glass substrate having the video signal wiring 2a and the scanning signal wiring 1a will be described. A common bus wiring 3a at an end opposite to an electrode for mounting a driving LSI for the plurality of video signal wirings 2a, 4a and 5a are formed by being connected to the video signal wiring 2a having a pixel arrangement of red (R), green (G) and blue (B), respectively. That is, the video signal wiring 2a is connected to the common bus wiring every three lines, and the common bus wirings 3a, 4a, 5a are connected to the inspection electrode pads 3b, 4a.
b, 5b. With such a configuration, even if the probe is not connected to the mounting electrode 2b of the driving LSI of each video signal wiring 2a, the probe is applied to the common bus wirings 3a, 4a, 5a connected to each video signal wiring 2a and the counter electrode. Since the image inspection is possible by connecting, the image display inspection can be easily performed.

FIG. 2 is a signal circuit block diagram showing the inspection method, which will be described. The video signals R, G, and B serving as test signals are generated by the common bus wiring drive circuit 21a, input from the three test probe electrodes 3c, 4c, and 5c, and the scan signals serving as test signals are used for normal image display. Input one by one as in the case. Then, an inspection signal is also input to the counter electrode. The respective images of white, black, R, G, and B are displayed by the same method as a normal liquid crystal driving method, an image abnormality is detected, and a pass / fail test is performed.

This inspection is performed after the panel process of the liquid crystal display panel 8 is completed. In the subsequent process, before the final inspection, the video signal wiring 2a is connected to the common bus outside the pixel region 11 shown in FIG. A final liquid crystal display panel in which each video signal wiring 2a is separated is formed by cutting with laser light at a cutting portion 6 provided between the wirings 3a, 4a, and 5a. Here, a liquid crystal display panel can be simply formed by cutting only the wiring using laser light.

The cutting by a laser beam or the like may be performed at any step after the inspection after the completion of the panel step. In this embodiment, one video signal line has a stripe arrangement connected to pixels displaying the same color. However, even in a delta arrangement or the like in which a plurality of colors are repeated, similar image display can be performed with the same configuration. It goes without saying that it is possible.

Although laser light is used to cut the video signal wiring and the common bus wiring, the wiring is cut and removed by cutting the glass substrate or the like by arranging the bus wiring outside the panel sealing material. You may. As described above, by performing glass cutting, the edge of the panel is shaved, so that the size of the liquid crystal display panel can be reduced. In this manner, the present invention provides the video signal wiring 2a connected to the pixels of R, G, and B with the same common bus wiring 3a, 4a, 5a.
By connecting to (a), the inspection after the panel process is completed, the inspection of the liquid crystal display panel 8 can be performed with only three inputs of the video signal input of R, G, and B, and the inspection with the simple inspection circuit and the probe can be performed. It becomes possible. That is, the common bus wirings 3a, 4
The probe 21 is connected to the electrode pads 3a, 4a, 5a
The liquid crystal display panel can be image-displayed by connecting a, and its quality can be determined.

By adopting such a configuration, it is not necessary to develop an inspection probe for a special small size, the development cost of the inspection probe can be reduced, the development period can be shortened, and the stability of the probe contact can be secured. Maintenance becomes easier. COG method (chip-on-glass method)
In the case of a mounting electrode for directly mounting a liquid crystal driving LSI chip on a glass substrate, the electrodes 2b for mounting the LSI for connection to the driving LSI chip are dense. It is difficult to do. It is needless to say that the present invention is suitable for inspection of pixels of a liquid crystal display panel on which a driving LSI chip is mounted by a COG method or the like.

The video signal wiring 1a and the common bus wiring 3
By performing the cutting of a, 4a, and 5a immediately before the final inspection in the manufacturing process of the liquid crystal display panel, the common bus wiring can be used as a short ring for preventing electrostatic destruction, thereby preventing element destruction due to static electricity and improving the yield. .

Here, the description is for the case of using an active matrix driving type liquid crystal display panel using thin film transistors or the like for forming video signal wirings and scanning signal wirings on the same glass substrate. The present invention can be similarly applied to a simple matrix drive type liquid crystal display panel formed on a glass substrate.

By providing a plurality of video signal wirings or a common bus wiring connected to a plurality of scanning signal wirings in the same manner as in the above active matrix driving method, it is easy to connect a probe to the common bus wiring. Become. Then, it is possible to input an inspection signal to the video signal wiring and the scanning signal wiring, display an image on the inspection liquid crystal display panel, and determine the quality.

FIG. 3 illustrates a method of manufacturing a liquid crystal display panel according to the present invention. Since the liquid crystal display panel shown in FIG. 3 has basically the same configuration as the inspection liquid crystal display panel 8 shown in FIG. 1, the same components are denoted by the same reference numerals and detailed description will be omitted. 3a, 4 between the video signal wiring 2a and the common bus wiring
a, 5a have a resistance 7 of several KΩ to several tens KΩ.
The resistance value of the resistor 7 is 1K to 90KΩ,
In some active matrix type liquid crystal display panels having a (thin film transistor) or the like, the resistance value of the resistor 7 may be as high as several hundred KΩ to several MΩ.

Thus, when the inspection liquid crystal display panel 8 has short defective portions 30 and 31 due to a pattern abnormality or the like, the former is a short circuit of the common bus wirings 3a and 4a, and the display abnormality occurs on the entire surface of the inspection liquid crystal display panel. However, since the latter is a short circuit between the video signal lines 2a and a short circuit of the common bus line via the additional resistor 7,
The additional voltage drop on the common bus line is limited, and the entire display of the liquid crystal display panel 10 does not become abnormal, and the display abnormality limited to the video signal line 1a in which the short-circuit failure occurs occurs.

That is, since it can be recognized as a line defect, a defective portion can be specified. Then, it is possible to repair a defective portion of the liquid crystal display panel due to laser cutting or the like of the defective portion.

In a liquid crystal display panel of an active matrix drive system or a simple matrix drive system, a common bus line connected to a plurality of scanning signal lines is formed on a side opposite to a mounting electrode of a driving LSI for a plurality of scanning signal lines. .
By connecting the probe to the electrode pad provided on the common bus wiring, the probe is connected to the common bus wiring connected to each scanning line signal wiring without connecting the probe connected to each scanning signal wiring. The image inspection is possible by connecting.

[0031]

As described above, according to the present invention, even when a short circuit occurs between adjacent video signal wirings or between adjacent scanning signal wirings, a video signal having a short-circuited image display due to the input of an inspection signal is provided. The display error of the liquid crystal display panel limited to the wiring or the scanning signal wiring can be specified, and the entire display of the liquid crystal display panel does not become abnormal even in the above short circuit. This has a remarkable effect that no problem occurs even if there is a short circuit, and the quality of the manufacturing method of the liquid crystal display panel can be improved, which is of great industrial value.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a liquid crystal display panel according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a signal input circuit of the inspection method.

FIG. 3 is a diagram showing a signal input circuit of an inspection method according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a liquid crystal panel obtained by the manufacturing method of the present invention.

FIG. 5 is a schematic diagram of a configuration of a conventional liquid crystal display device.

[Explanation of symbols]

 1a scanning signal wiring 1b electrode 2a video signal wiring 2b electrode 3a common bus wiring (R signal input) 3b electrode pad (R signal input) 4a common bus wiring (G signal input) 4b electrode pad (G signal input) 5a common bus wiring (B signal input) 5b Electrode pad (B signal input) 6 Cutting part 8 Liquid crystal display panel

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/13 101 G02F 1/1343 G09F 9/00 352

Claims (1)

(57) [Claims] 1. A liquid crystal display panel having a plurality of video signal wirings and a plurality of scanning signal wirings, wherein each of the scanning signal wirings is divided into a plurality of groups and connected to each of the scanning signal wirings. One end of each of the video signal wirings has an electrode for inputting a video signal of the video signal wiring, and one end of each of the scanning signal wirings has an electrode for inputting a scanning signal. Having a resistor connected to each of the common bus lines and the other end of each of the scanning signal lines in the same group, and further having an electrode pad at one end of each of the common bus lines. A test signal is input to each of the video signal input electrodes and each of the electrode pads to display an image on a liquid crystal display panel, and the resistance value of the resistor is set even when the adjacent scanning signal wiring is short-circuited. According to the input of the inspection signal A liquid crystal display characterized in that the image display is a resistance value that causes display abnormality of the liquid crystal display panel limited to the scanning signal wiring having the short circuit, and the resistance value does not cause an abnormal display of the entire liquid crystal display panel due to the short circuit. Panel manufacturing method.