JP2000241784A - Inspection device for liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection device without the fear of causing a defect of display or a malfunction of a liquid crystal display device at the time of connecting it with the inspection device and applying/switching off an electric signal by electrically grounding the connecting part, etc., between the liquid crystal display device and the inspection device through a resister for a period other than that for applying the electric signal. SOLUTION: This inspection device is provided with such a switching means that electrically grounds a connecting part between a liquid crystal display device and the inspection device and a connecting terminal for a period other than that for through a resister, and electrically switch off the resister at the time of applying the electric signal. Namely, when the liquid crystal display device 11 is inspected by this inspection device 12, one or more connecting parts of the liquid crystal display device 11 are connected to a COM terminal of a relay 13 constructed in the inspection device 12. At the same time, an electric signal of an electric signal generating device 14 constructed in the inspection device 12 is connected with an NO terminal of the relay 13, and an NC terminal of the relay 13 is electrically grounded through the resister 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inspection device for a liquid crystal display device.

[0002]

2. Description of the Related Art Liquid crystal display devices are widely used in monitors for personal computers and the like because of their lightness and low power consumption. However, these liquid crystal display devices are susceptible to static electricity, and externally applied static electricity. As a result, the liquid crystal display pattern is destroyed, the display performance is degraded due to the characteristic fluctuation, and functional defects such as line defects are generated. This phenomenon is remarkable in a TFT liquid crystal display device and a polysilicon liquid crystal display device in which a large number of semiconductors are formed.

On the other hand, in the process of manufacturing such a liquid crystal display device, a liquid crystal panel constituting the liquid crystal display device is completed, and a driving IC, a metal frame and the like are incorporated into the liquid crystal panel to complete the liquid crystal display device. Inspection apparatuses have been used in which an electric signal is applied to a liquid crystal display device including a liquid crystal panel, an electric test is performed with the liquid crystal display device in a display state, and then the application of the electric signal is stopped.

[0004]

However, in such a configuration, when the inspection device is connected to the liquid crystal display device, the electric charge accumulated inside the liquid crystal display device rapidly moves toward the inspection device, The movement of the electric charges destroys the internal elements and internal patterns constituting the liquid crystal display device or changes the characteristics. After that, when an electric signal is applied and the liquid crystal display device is displayed and an electric inspection is performed, a line defect is generated. In addition, there is a problem that display defects such as streaks and functional defects occur.In addition, the signal potential transiently changes within a few microseconds or less when applying and stopping the electric signal from the inspection device to the liquid crystal display device. The charge may increase and the charge may move rapidly. At this time, a display defect or a functional defect may occur in the liquid crystal display device. Further, when the application of the electric signal is stopped and the liquid crystal display device is detached from the inspection device, various problems such as a similar display defect and a functional defect may occur in the liquid crystal display device due to a sudden movement of electric charges. There is a point.

FIG. 3 is a block diagram schematically showing a conventional inspection apparatus for a liquid crystal display device, and shows an example of an apparatus which addresses the above problem. In this device, one or more connection portions for connecting the inspection device 12 to the liquid crystal display device 11 are electrically grounded through the resistor 15. In this configuration, when the inspection device is connected to the liquid crystal display device, the liquid crystal display device is connected to the liquid crystal display device. Although the problem caused by the rapid movement of the charges accumulated in the display device toward the inspection device can be absorbed to some extent, when an electric signal is applied, the electric signal is distorted due to the resistor 15 and the liquid crystal is distorted. There is a problem that the display characteristics of the panel and the liquid crystal display device are deteriorated.

The present invention has been made to solve the above-mentioned conventional problems. In the electrical inspection of a liquid crystal display device, when the liquid crystal display device is connected to the inspection device and when an electric signal is applied / stopped, display defects of the liquid crystal display device are caused. It is an object of the present invention to provide an inspection device that does not cause a malfunction or a malfunction.

[0007]

According to the present invention, there is provided an inspection apparatus for a liquid crystal display device, wherein the liquid crystal display device is connected to the inspection device, an electric signal is applied from the inspection device, the liquid crystal display device is displayed, and an electric test is performed. After the application of the electric signal, the application of the electric signal is stopped, and the connection between the liquid crystal display device and the inspection device is disconnected. One or more connection portions and one or more connection terminals between the device and the inspection device are electrically grounded through a resistor, and a switch is provided for electrically disconnecting the resistor when an electric signal is applied.

According to the present invention, since the liquid crystal display device is gradually discharged, it is possible to prevent the liquid crystal display device from being destroyed due to abrupt movement of electric charges. Since the portion is electrically grounded through the resistor, transient rise of the electric signal potential and distortion of the electric signal are prevented, and there is no possibility of causing a display defect or a functional defect of the liquid crystal display device.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for the same parts as those of the conventional one.
FIG. 1 is a schematic block diagram showing a configuration of an inspection apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of an operation state of the apparatus shown in FIG.

In each of the figures, reference numeral 11 denotes a liquid crystal display, and 12
Is an inspection device, 13 is a relay serving as switch means, 14 is an electric signal generator, 15 is a resistor, NO, COM, NC
Is a terminal.

In this device, when applying / stopping an electric signal from the inspection device 12 to the liquid crystal display device 11, a relay 13 is used for controlling the application / stop of the electric signal.
A mode in which the COM terminal and the NC terminal are electrically connected;
A mode in which the OM terminal and the NO terminal are electrically connected;
The terminal has a mode for electrically connecting the COM terminal and the NC terminal. When the electric signal shown in FIG.
The terminal is connected to the NC terminal, the COM terminal, the NO terminal and the NC terminal are connected for a short time of 1 μs or less immediately after the application / stop of the electric signal shown in FIG. 2B, and the electric signal shown in FIG. Operates such that the COM terminal and the NO terminal are connected.

When the liquid crystal display device 11 is inspected, one or more connection portions of the liquid crystal display device 11 are connected to the COM terminal of the relay 13 provided in the inspection device 12 and are also provided in the inspection device 12. The electric signal of the electric signal generator 14 is connected to the NO terminal of the relay 13, and the NC terminal of the relay 13 is electrically grounded through the resistor 15. Relay 13
Is set to be performed in conjunction with the operation / stop control of the electric signal generator 14. This state is shown in FIG.

Here, when the electric signal generator 14 is operated, the relay 13 is in the state shown in FIG.
NO terminal, COM terminal and NC for a short time of 1 μs or less
All the terminals are switched to the grounded state via the resistor 15, and when the signal potential is transiently increased in a short time of several μs or less at the time of applying and stopping the electric signal, the rapid charge transfer is caused by the resistance. Then, the COM terminal and the NC terminal are cut off by the relay 13, the liquid crystal display device 11 is connected to the inspection device 12 in the state of FIG. 2C, and an electric signal is applied. Inspection is performed.

As described above, the liquid crystal display device 11 operates the relay 13 except during the period of applying the electric signal (FIG. 2C).
Is electrically grounded through a resistor 15 connected to an NC terminal of the liquid crystal display device, and as a resistance value of the resistor 15, 100 V which is a maximum voltage value used in a normal liquid crystal display device 11 is applied. Also, 100 kΩ or more is appropriate in order to suppress the current value to 1 mA or less that does not cause display failure or functional failure in the liquid crystal display device 11. Also, relay 1
As a specific example of No. 3, M-B-B (Make-Befo
re-Break) type relay is preferable.
The B-type relay connects the COM terminal and the NC terminal when the electric signal is stopped, and connects the COM terminal and the NO terminal when the electric signal is applied. Furthermore, 1 μm immediately after the application / stop of the electric signal
In a short time of s or less, the three terminals COM, NO, and NC are connected, and the liquid crystal display device 11 is electrically grounded through the resistor 15.

As described above, according to the present embodiment, the charge of the liquid crystal display device is gradually removed, and the liquid crystal display device can be prevented from being broken due to rapid movement of electric charge. During this period, the connection is electrically grounded through the resistor, so that a transient rise of the electric signal potential and distortion of the electric signal are prevented, and there is no possibility of causing a display defect or a functional defect of the liquid crystal display device.

[0016]

According to the present invention, it is possible to prevent rapid movement of electric charges at the time of inspection of a liquid crystal display device, and to prevent display defects and functional defects of the liquid crystal panel and the liquid crystal display device caused by the inspection device. Effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing a configuration of an inspection apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation state of the device shown in FIG.

FIG. 3 is a schematic block diagram showing a configuration of a conventional inspection device.

[Explanation of symbols]

 Reference Signs List 11 liquid crystal display device 12 inspection device 13 relay 14 electric signal generator 15 resistor

Claims (3)

[Claims] An electric signal is applied from the inspection device by connecting the liquid crystal display device and the inspection device, an electric test is performed with the liquid crystal display device in a display state, and then the application of the electric signal is stopped.
An inspection device for a liquid crystal display device in which a connection between the liquid crystal display device and the inspection device is detached, wherein one or more connection portions and one or more connection portions between the liquid crystal display device and the inspection device during a period other than a period during which an electric signal is applied. An inspection apparatus for a liquid crystal display device, comprising: switch means for electrically grounding the connection terminal through a resistor and electrically disconnecting the resistor when an electric signal is applied. 2. The inspection device for a liquid crystal display device according to claim 1, wherein the resistance value of the resistor is 100 kΩ or more. 3. The inspection device for a liquid crystal display device according to claim 1, wherein the switch means is an MBB relay.