JPH08297292A - Cog system liquid crystal display panel - Google Patents

Abstract

PURPOSE: To facilitate inspection by including probing pad arrays in correspondence to driving ICs in wiring patterns, applying a probe on these arrays to make continuity inspection and using the transparent electrodes to be impressed with voltage among the adjacent driving ICs as the probing pads of the other driving ICs. CONSTITUTION: The probe 18 provided with probe pins 17-1 to 17-n is pressed to the probing pad arrays of n pieces of pads and the continuity between the pins 17-1, 17-2, etc., is investigated. Next, the probes 18 is moved until the probe 18 is pressed to the probing pad arrays corresponding to the next driving IC. The continuity is then inspected. Namely, the probing pad arrays corresponding to the driving ICs are formed at conductive wires 3b and the continuity inspection of the transparent electrodes 3 is executed by contacting the probe 18 therewith. The transparent electrodes 3 to be impressed with the voltage by the driving IC among the adjacent driving IC in the probing pad arrays are used for the pad arrays of the other driving ICs, by which the execution of the continuity inspection is made possible even if the respective pad arrays are parted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a COG type liquid crystal display panel having a probing pad row for each driving IC.

[0002]

2. Description of the Related Art One type of liquid crystal display panel is a chip-on-glass (CHIP-type) in which a driving IC is mounted on a glass substrate.
There is an ON-GLASS (hereinafter abbreviated as COG) type liquid crystal display panel, which has already been put into practical use.

FIG. 3 is a plan view of the COG type liquid crystal display panel 1, and FIG. 4 is a sectional view taken along the line XX in FIG. According to these figures, the scanning side substrate 4 and the signal side substrate 5 having the transparent electrodes 2 and 3 formed on the inner surfaces thereof are arranged to face each other, and an alignment film (not shown) is provided on each transparent electrode 2 and 3. ) To form a display area. Both the substrates 4 and 5 are fixed via a sealant 6, and a liquid crystal 8 is sealed inside the both substrates with a spacer 7 keeping the substrate spacing constant. Further, the transparent electrode 2 of the scanning side substrate 4 is electrically connected to the transparent electrode 3 on the signal side substrate 5 through an Ag paste 9 provided on the end portion by a printing method.
Reference numeral 10 is a driving IC, and 11 is a signal input cable composed of a flexible printed wiring board. Furthermore, regarding the transparent electrode 3 provided on the signal-side substrate 5, a metal layer is formed on the transparent electrode 3 in the non-display area, whereby a conductive line 3a having a high conductivity is formed. The resistivity of the wiring is reduced.

According to the liquid crystal display panel 1 having the above-described structure, when the scanning side substrate 4 and the signal side substrate 5 are manufactured,
There is a step of forming a transparent conductive film on one surface of a glass substrate and then forming the transparent electrodes 2 and 3 having a predetermined shape by photoetching. After this step, a continuity test of both transparent electrodes 2 and 3 is performed.

An example of conducting the conduction inspection of the signal side substrate 5 will be described with reference to FIG. This figure shows the transparent electrode pattern immediately before the inspection of the signal side substrate 5. Each transparent electrode 3 in the display area
The conductive lines 3a are respectively connected to the IC output line parts 12 which serve as bonding pad parts at these ends.
To make. The group of (n-1) IC output line portions 12 is connected to the corresponding driving ICs 10 in a later step. Reference numeral 13 in the drawing is a drive IC mounting area.

When conducting the continuity inspection, each of the probes 15 provided with n probe pins 14 is added to the same number (n-1) as the number of the IC output line portions 12, that is, each transparent probe. Apply to electrode 3, then between pins 14-1 and 14-2, between pins 14-2 and 14-3 ,. ． ． Pin 14- (n-2) and Pin 14- (n-
1) and the presence or absence of conduction between the pin 14- (n-1) and the pin 14-n.

In this way, after inspecting the row of the transparent electrodes 3 corresponding to a certain driving IC 10 for conduction, the probe 15 is moved to the row of the transparent electrodes 3 corresponding to the adjacent driving IC 10 to conduct electricity in the same manner. Inspect for presence.

[0008]

However, according to the continuity test as described above, when the electrode spacing of the array of the transparent electrodes 3 differs depending on the product, the individual probes 15 are arranged according to the electrode spacing. There is a problem in that the number of types of the probe 15 is increased, the number of processes is increased, and the manufacturing cost is increased.

Therefore, the present invention has been completed in view of the above circumstances, and an object thereof is to provide a COG type liquid crystal display panel which facilitates a continuity inspection of a transparent electrode using a probe and can reduce the manufacturing cost. To do.

[0010]

The COG type liquid crystal display panel of the present invention comprises:
A pair of transparent substrates formed by forming a transparent electrode pattern and an alignment film are bonded together via a liquid crystal layer to form a display area, and a plurality of driving ICs are arranged on the non-display area of one transparent substrate. A wiring pattern is provided by extending the transparent electrode pattern to the vicinity of a plurality of driving ICs, and the wiring pattern has a probing pad row corresponding to each driving IC The transparent electrode to which a voltage is applied by one of the driving ICs is used as a probing pad of the other driving IC.

[0011]

In the COG type liquid crystal display panel having the above structure, the wiring pattern is provided with a probing pad row corresponding to each driving IC, and a probe is applied to the probing pad row to inspect the continuity of the transparent electrode. With this configuration, the probe is not directly applied to the transparent electrode as in the conventional case, so that the electrode spacing of the array of transparent electrodes is
Even when different products are used, it is not necessary to prepare individual probes according to the electrode spacing.

Further, in the above probing pad row, among the adjacent driving ICs, the transparent electrode to which a voltage is applied by a certain driving IC is provided to the probing pad of the other driving IC, so that each probing pad row is provided. Continuity test can be performed even if the points are far apart.

[0013]

EXAMPLES The COG type liquid crystal display panel of the present invention will be described in detail below. According to the COG type liquid crystal display panel of the embodiment, the shape of the conductive line 3a in the non-display area of the COG type liquid crystal display panel 1 is different, but other configurations are the same as the liquid crystal display panel 1. is there.

Also in the COG type liquid crystal display panel of this example, when the scanning side substrate 4 and the signal side substrate 5 are manufactured, a transparent conductive film is provided on one surface of a glass substrate, and a predetermined shape is formed by the next photoetching. There is a step of forming the transparent electrodes 2 and 3, and after this step, a continuity test of both transparent electrodes 2 and 3 is performed.

FIG. 1 shows the transparent electrode pattern immediately before the inspection of the signal side substrate 5. The conductive lines 3b are respectively connected to the respective transparent electrodes 3 in the display area, and bonding pads (IC output line parts) are formed at these ends. Also serves as the probing pad row 16.

This probing pad row 16 has (n-
1) It is composed of a group of IC output line parts and one pad which is the n-th, and (n-1) group of IC output line parts is connected to the driving IC 10 in a later step. . The transparent electrode connected to the nth pad is connected to the first IC output line portion of the adjacent driving IC 10. Reference numeral 13 in the drawing is a drive IC mounting area.

Next, the continuity test will be described with reference to FIG. n
A probe 18 provided with one probe pin 17 is applied to the probing pad row 16 of n pads, and then between the pins 17-1 and 17-2, between the pins 17-2 and 1
7-3 ,. ． ． Pin 17- (n-2) and pin 17
-(N-1), pin 17- (n-1) and pin 17
By checking the presence / absence of conduction with −n, a conduction test is performed on the array of the transparent electrodes 3 corresponding to one drive IC 10.

Next, the probe 18 or the signal side substrate 5 is moved to move the probe 18 to the adjacent drive I.
It is applied to the probing pad row 16 corresponding to C10, and the presence or absence of continuity is similarly inspected.

Thus, in the COG type liquid crystal display panel having the above-mentioned structure, the probing pad row 16 corresponding to each driving IC is formed on the conductive line 3b, and the probe 18 is applied to the probing pad row 16 so that the transparent electrode 3 is formed. The continuity test of can be performed. And
In this probing pad row 16, among the adjacent driving ICs, the transparent electrode 3 to which a voltage is applied by a certain driving IC is provided to the probing pad row 16 of the other driving IC, so that each probing pad row 16 is provided. The continuity test can be performed even if the points are far apart.

Therefore, even if the electrode spacing of the array of the transparent electrodes 3 differs between products, it is not necessary to prepare individual probes according to the electrode spacing.

The present invention is not limited to the liquid crystal panel as in the above embodiment, and various modifications and improvements may be made without departing from the scope of the present invention.

[0022]

As described above, in the COG type liquid crystal display panel of the present invention, the wiring pattern has individual driving I.
A probing pad row corresponding to C is provided, and a probe is applied to the probing pad row to conduct a continuity test of the transparent electrode. Further, in the probing pad row, a driving IC among adjacent driving ICs is provided. The transparent electrode to which a voltage is applied is provided to the probing pad of the other driving IC. According to such a configuration, the continuity test can be performed even if the probing pad rows are separated from each other. Since the probe is not directly applied to the transparent electrode like this, even if the electrode spacing of the array of transparent electrodes differs between products, it is not necessary to prepare individual probes according to the electrode spacing, and as a result Thus, it is possible to provide a COG liquid crystal display panel in which the manufacturing cost can be reduced by facilitating the conduction test of the transparent electrode using the probe.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a transparent electrode pattern of a substrate in a liquid crystal display panel of an example.

FIG. 2 is an explanatory diagram showing a continuity test for the transparent electrode pattern of FIG.

FIG. 3 is a plan view of a liquid crystal display panel.

4 is a sectional view taken along line XX in FIG.

FIG. 5 is an explanatory diagram showing a conventional continuity test for a transparent electrode pattern.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2, 3 Transparent electrode 4 Scanning side substrate 5 Signal side substrate 8 Liquid crystal 10 Driving IC 3a, 3b Conductive wire 12 IC output line part 13 Driving IC mounting area 14, 17 Probe pin 15, 18 Probe 16 Probing Pad row

Claims (1)

[Claims] 1. A pair of transparent substrates, each having a transparent electrode pattern and an alignment film formed thereon, are bonded together via a liquid crystal layer to form a display region, and a plurality of driving electrodes are provided on a non-display region of one transparent substrate. ICs are arranged, the transparent electrode pattern is extended to the vicinity of a plurality of driving ICs to provide a wiring pattern, and the wiring pattern has a probing pad row corresponding to each driving IC. And adjacent drive I
A COG liquid crystal display panel, wherein a transparent electrode to which a voltage is applied by one of the driving ICs of C is provided to a probing pad of the other driving IC.