JPH0622873Y2 - Electrode short detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A liquid crystal panel inspecting device having a transparent electrode formed on the surface thereof, and particularly an inter-electrode short-circuit detecting device for detecting a short-circuit between adjacent electrodes. With the aim of providing an inter-electrode short-circuit detection device that can detect poor contact of the child and has a high inspection capability, one liquid crystal panel to be inspected is placed at each predetermined position so that the electrodes of the liquid crystal panel to be inspected are exposed. A plurality of stacked trays and, for each liquid crystal panel to be inspected placed at a predetermined position of the tray, a pair of contacts provided at positions facing the electrodes are provided. It is configured such that the insulation resistance between a pair of contacts brought into contact with one electrode and another pair of contacts brought into contact with the second electrode is measured and a short circuit between adjacent electrodes can be detected.

[Industrial application field]

The present invention relates to a liquid crystal panel inspecting apparatus having a transparent electrode formed on a surface thereof, and more particularly to an inter-electrode short circuit detecting apparatus for detecting a short circuit between adjacent electrodes.

A device that automatically detects a short circuit between adjacent electrodes on a liquid crystal panel is normally judged as a good product if the two electrodes of the short circuit detection circuit are brought into contact with the adjacent electrodes and current does not flow in the short circuit detection circuit. There is. However, if the connection between the electrode and the contact is insufficient, a current may not flow to the short-circuit detection circuit even if there is a short circuit between the electrodes, and thus it may be determined as a good product.

Therefore, there is a demand for realization of a highly reliable inter-electrode short-circuit detection device that has a small effect on the detection of a short-circuit between adjacent electrodes due to the contact state of the contacts.

[Conventional technology]

FIG. 3 is a circuit diagram showing a conventional inter-electrode short circuit detection device,
FIG. 4 is a time chart for explaining the operation.

An inter-electrode short-circuit detection device shown in FIG. 3 which has a small influence of the contact state of the contact on the detection of a short-circuit between adjacent electrodes and has a high reliability has already been proposed. That is, the short circuit detection unit 1 including the first pulse generation circuit 11, the second pulse generation circuit 12, the contact failure determination circuit 13, and the short circuit detection circuit 14, and the moving table on which the liquid crystal panel 2 to be inspected is placed. 3, the liquid crystal panel 2 has a large number of electrodes 21 arranged at equal intervals along the edge, and when the motor 31 is operated, the moving table 3 moves the liquid crystal panel 2 in the arrangement direction of the electrodes 21. Let

The pulse generation circuit 11 includes contacts 15 and 16, and the pulse generation circuit 12 includes contacts 16 and 18, and the contacts 15, 16, 17, and 18 are placed outside the electrode formation area of the liquid crystal panel 2. When 2 is moved, the four contactors 15, 16, 17, 18 come into contact with all the electrodes on the liquid crystal panel 2 in sequence, and the first pulse generation circuit
The pulse signal shown in FIG. 11 to FIG. 4 (b) is output from the second pulse generating circuit 12 and the pulse signal shown in FIG. 4 (c) is output.

The pulse signal shown in FIG. 4 (b) or FIG. 4 (c) is the contact 1
5, 16 or the contacts 17, 18 are output when they respectively contact the electrode 21 shown in FIG. 4 (a), and are output between any one of the contacts and the electrode that are in contact with the same electrode. No output if there is poor contact. Therefore, for example, the number of pulses of the signal output from the first pulse generation circuit 11 or the number of pulses of the signal output from the second pulse generation circuit 12 is formed on the liquid crystal panel 2 in the contact failure determination circuit 13. The presence or absence of contact failure can be detected by comparing with the number of electrodes.

The short-circuit detection circuit 14 is connected to either one of the contacts 15 and 16 in contact with the first electrode 21a and the adjacent second electrode 2a.
A highly reliable inter-electrode short-circuit detection device, which is connected to either one of the contacts 17 and 18 in contact with 1b, can detect a short circuit between adjacent electrodes and a contact failure between the electrode and the contact. be able to.

[Problems to be Solved by the Invention] However, in the case of the conventional inter-electrode short-circuit detection device, as shown in the figure, only one liquid crystal panel to be inspected can be placed on the moving table, and the inter-electrode short-circuit detection device has an extremely high inspection capability. There was a problem of being low.

An object of the present invention is to provide an inter-electrode short-circuit detecting device that can detect a short circuit between adjacent electrodes and a contact failure between the electrode and the contactor and has a high inspection capability.

[Means for Solving the Problems]

FIG. 1 is a perspective view showing an inter-electrode short circuit detection device of the present invention. Note that the same object is represented by the same signal throughout the drawings.

The above problem is to mount a single liquid crystal panel 2 to be inspected at a predetermined position, and stack a plurality of trays 4 stacked so that the electrodes 21 of the liquid crystal panel 2 to be inspected are exposed, and to mount a predetermined position on the tray 4. An electrode for each inspected liquid crystal panel 2 placed
Two pairs of contacts 15, 16, 17, 1 provided at positions facing 21
Between the pair of contactors 15, 16 having the first electrode 21a on the liquid crystal panel 2 to be inspected and the other pair of contactors 17, 18 contacting the second electrode 21b. This is achieved by the inter-electrode short-circuit detection device of the present invention, which measures the insulation resistance of the electrode and detects a short circuit between adjacent electrodes.

[Action]

In FIG. 1, one liquid crystal panel to be inspected is placed at each predetermined position, a plurality of trays are stacked so that the electrodes of the liquid crystal panel to be inspected are exposed, and an object to be inspected placed at a predetermined position on the tray. Each inspection liquid crystal panel has a pair of contacts provided at positions facing the electrodes, and a pair of contacts brought into contact with the first electrode on the liquid crystal panel to be inspected;
By measuring the insulation resistance between the other pair of contactors that are in contact with the electrodes, it is possible to detect the short-circuit between the electrodes in multiple liquid crystal panels at the same time. It is possible to realize an inter-electrode short-circuit detecting device which has a high inspection capability and which can detect the contact failure.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 2 is a perspective view showing details of the contact in the present invention.

As shown in FIG. 1, the inter-electrode short-circuit detecting device according to the present invention is such that one liquid crystal panel 2 to be inspected is placed at each predetermined position and the electrodes 21 of the liquid crystal panel 2 to be inspected are stacked so as to be exposed. It has a plurality of trays 4, and the plurality of trays 4 are mounted on a moving table 3 having a motor 31.

On the other hand, for each liquid crystal panel 2 to be inspected placed at a predetermined position on the tray 4, two pairs of contacts 15 and 1 are provided at positions facing the electrodes 21.
As shown in FIG. 2, two pairs of contacts 15, 16, 17, and 18 each including a stylus 151 and an arm 152 are provided with wiring patterns 154 formed on a printed circuit board 153. Is soldered to the wiring pattern 154 and the lead wire 155.
Is connected to the short-circuit detection unit via.

A large number of electrodes 21 are arranged along the edge of the liquid crystal panel 2 at equal intervals. When the contacts 15, 16, 17, 18 are placed outside the electrode forming area of the liquid crystal panel 2, the motor 31 is operated. The moving table 3 moves the liquid crystal panel 2 in the arrangement direction of the electrodes 21. The insulation resistance between the pair of contacts 15 and 16 in contact with the first electrode 21a on the liquid crystal panel 2 to be inspected, and the other pair of contacts 17 and 18 in contact with the second electrode 21b, A short circuit between adjacent electrodes can be detected by measuring.

In this way, one LCD panel to be inspected is placed at each predetermined position.
A plurality of trays placed one by one and stacked so that the electrodes of the liquid crystal panel to be inspected are exposed, and each liquid crystal panel to be inspected placed at a predetermined position of the tray is provided at a position facing the electrodes. It has two pairs of contacts and measures the insulation resistance between a pair of contacts that are in contact with the first electrode on the liquid crystal panel to be inspected and another pair of contacts that are in contact with the second electrode. By doing so, it becomes possible to detect a short circuit between electrodes in a plurality of liquid crystal panels at the same time, and it is possible to detect a short circuit between adjacent electrodes and a contact failure between the electrode and the contactor, thereby realizing an inter-electrode short circuit detection device with high inspection capability. be able to.

[Effect of device]

As described above, according to the present invention, it is possible to provide a short circuit between electrodes and a contact failure between the electrode and the contactor, and it is possible to provide an inter-electrode short circuit detection device having a high inspection capability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an inter-electrode short-circuit detecting device of the present invention, FIG. 2 is a perspective view showing details of a contact in the present invention, and FIG. 3 is a circuit diagram showing a conventional inter-electrode short-circuit detecting device. FIG. 4 is a time chart for explaining the operation. In the figure, 2 is a liquid crystal panel to be inspected, 3 is a moving table, 4 is a tray, 15,16,17,18 are contacts, 21,21a, 21b are electrodes, 31 is a motor, 151 is a stylus, 152 is an arm, Reference numeral 153 is a printed circuit board, 154 is a wiring pattern, and 155 is a lead wire.

Claims (1)

[Scope of utility model registration request] 1. A liquid crystal panel (2) to be inspected is placed at a predetermined position one by one, and electrodes of the liquid crystal panel (2) to be inspected are placed.
Multiple trays (4) stacked to expose (21)
And for each liquid crystal panel (2) to be inspected placed at a predetermined position on the tray (4), two pairs of contactors (15, 16, A pair of contacts (15, 16) having a first electrode (21a) on the liquid crystal panel (2) to be inspected and a second electrode (21b). The insulation resistance between the other pair of contacts (17, 18),
An inter-electrode short circuit detection device characterized by detecting a short circuit between adjacent electrodes.