KR20010004233A - Method for inspecting short of electrode in plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a method of shortening the material defect and processing time by inspecting a defect of the electrode after the formation of the electrode. In the electrode defect inspection method of the present invention, is the first and second electrodes shorted to each other by applying an AC voltage by connecting a positive terminal to a plurality of first electrodes and a negative terminal to a plurality of second electrodes? It is characterized by checking whether or not.

Description

Method for inspecting short of electrode in plasma display panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to flat panel display technology, and more particularly to a method for inspecting a defect of an electrode of a plasma display panel (hereinafter referred to as PDP).

In general, a PDP is a device that displays characters or images by using light emitted from a plasma generated during gas discharge, and is also called a gas discharge display device. PDP is largely exposed to direct plasma because the electrode used to apply external voltage to form plasma is directly exposed because the direct current (DC) type and conduction current flowing through the electrode are covered with dielectric. Therefore, it is classified into AC type through which displacement current flows. In addition, depending on the electrode structure of the discharge cell, it is classified into a counter discharge type, a surface discharge type, a barrier rib discharge type, and the like. In the case of directly using the visible light emitted from the discharge gas, it is used in a monochromatic display PDP device. There is an orange PDP from Ne gas, and when full color display is required, ultraviolet light emitted from discharge gas such as Kr or Xe is red (R), green (G) and blue (B) phosphor. Using the visible light to excite the. However, there are still problems such as low brightness and contrast ratio, high driving voltage, low power consumption efficiency, and low manufacturing yield due to the difficulty in manufacturing process technology due to large size. I have a problem to do.

On the other hand, in order to perform the open and short inspection of the PDP electrode performed after the formation of the electrode of the PDP as described above, an open / short tester and a microscope are usually mounted and formed. After the electrode formation is performed using a pattern inspection apparatus for identifying each electrode, inspection is performed during an aging process, which is a panel stabilization process.

However, there is a problem in that it takes a long time to inspect a panel using such equipment, and it is difficult to accurately find all the defects. That is, it is difficult to find out the actual operation of the electrode until the aging (AGING) process, which is a panel stabilization process after the exhaust / sealing step of the panel.

In addition, there are many processes until the Aging process, which is the panel stabilization process, and the back plate also needs to go through all the processes, so that the conventional open / short tester and pattern inspection equipment are used. When the inspection is performed, even if the electrode is found to be defective, the defect cannot be corrected and the panel which has completed most processes should be discarded. Therefore, a problem arises in that the manufacturing cost increases due to a decrease in yield.

The present invention has been made to solve the problems described above, and provides a PDP electrode defect inspection method that can improve the productivity by reducing the material cost and process time by performing the inspection by a direct method of actually applying a voltage to the panel Its purpose is to.

1 is a view showing an electrode defect inspection method according to an embodiment of the present invention.

2 is a view illustrating an electrode defect inspection method in an exhaust / sealing path according to another embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10: glass substrate 20: electrode

30: short bar for voltage application

The present invention for achieving the above object, in the electrode defect inspection method of the plasma display panel having a plurality of electrodes, connecting a positive terminal to the plurality of first electrodes and a negative terminal to the plurality of second electrodes By connecting and applying an AC voltage, it is characterized in that whether the first and second electrodes are short-circuited with each other.

Preferably, the present invention provides a method for inspecting an electrode defect of a plasma display panel, the method comprising: exhausting / gas-injecting an electrode, a dielectric and a seal layer forming process in a vacuum chamber equipped with a front window and a back plate; A second step of aligning the front plate and the back plate and performing discharge to inspect the defects of the electrodes of the front plate and the back plate; And if the defect is found by determining whether or not the electrode is defective by the discharge observation through the visible window mounted on the vacuum chamber, the front plate and the back plate are replaced without performing the sealing process, and when there is no defect, the sealing is performed. And a third step of proceeding with the process.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. do.

1 is a diagram illustrating an embodiment of a method for easily inspecting a defect of an electrode formed in a PDP according to the present invention.

As shown in FIG. 1, the sustain electrodes and the scan electrodes 20 are alternately arranged on the glass substrate 10. At this time, the terminals of each of the sustain electrodes and the scan electrodes 20 alternately come out to the opposite side to facilitate the connection of a short bar 30 to be installed later.

Next, each of the two electrode inspection short bars 30 that can apply current to both terminal portions of each of the sustain electrodes and the scan electrodes 20 is connected to the respective electrode bars. Allow AC voltage (V) to be applied to (Short Bar, 30).

With the above configuration, a method for inspecting a defect of the PDP electrode will be specifically described.

First, when the AC voltage V in the configuration is applied, a voltage is applied to each of the sustain electrode and the scan electrode 20 connected to the respective short test bars 30. When the short is not generated, the applied current does not flow, and if the short does not occur, the applied current does not flow. As a result, the short portion becomes vulnerable to the electric current, and thus a high temperature is generated and the red portion is exposed.

In addition, when the current application time elapses for a long time, the portion in which the short occurs is burned out by the high temperature.

By the above-described method, it is possible to find the defect site more accurately and simply than the PDP electrode defect inspection method according to the prior art, and to burn the defect site by prolonging the application time of the current applied to the defect site. You can also make corrections automatically.

2 is a view illustrating a method of directly inspecting a PDP electrode defect in an exhaust / sealing path as another embodiment of the PDP electrode defect inspection method according to the present invention.

Referring to Figure 2, as shown in the case of applying to the device that is exhausted / sealed without the tip tube has been proposed recently, the front plate 10 and the back plate 20 as in the embodiment of the present invention Connect two electrode inspection short bars (Short Bars) 30 to both electrode terminals of the power supply, and supply the power supply (front panel: Vs, back plate: Va) to the respective Short Bars for electrode inspection. The PDP back plate and the front plate connected to each other are placed in a vacuum chamber 40 equipped with a visible window, heated / exhausted, and then injected with discharge gas to align. Next, the aligned panel is fixed with a clip or the like so as to be similar to the condition after the sealing step in the actual panel.

In addition, power is applied to the short bar 30 for inspecting the electrodes connected to the terminals of the front plate 10 and the back plate 20 to cause discharge of the plurality of electrodes. In this case, the applied voltage may be a voltage under the same condition as the actual operation of the panel or a voltage more severe than the voltage under the actual operating condition so that there may be a defect after the exhaust / sealing process even if there is no defect. Next, the discharge observation through the visible window mounted on the vacuum chamber 40 determines whether the electrode is defective or not, and if there is a defect, the defective substrate is replaced with a new substrate without a sealing process, and the defect is If not, proceed with the sealing process.

As the electrode defect inspection method as described above, defects which were not found using the open / short tester and pattern inspection equipment in the prior art can be accurately found, and also in the prior art Before the stabilization (AGING) process, the electrode was not known and after the process was almost finished, it was known, but in one embodiment and the other embodiments of the present invention by applying the above-described method before the stabilization (AGING) process before the PDP electrode Defects can be found to determine whether to correct or discard, thereby avoiding waste of material costs and processing time.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As the defect inspection method of the PDP electrode according to the present invention as described above, there is an effect that the material cost and processing time can be prevented from being wasted to improve productivity.

Claims (5)

In the electrode defect inspection method of the plasma display panel having a plurality of electrodes, Checking whether the first and second electrodes are short-circuited by applying an AC voltage by connecting a positive terminal to a plurality of first electrodes and a negative terminal to a plurality of second electrodes Plasma display panel electrode defect inspection method characterized in that. The method of claim 1, And a short bar for simultaneously connecting the plurality of first and second electrodes to facilitate voltage application to the plurality of first and second electrodes. The method of claim 1, The applied AC voltage is a plasma display panel electrode defect inspection method, characterized in that for applying the AC voltage of a condition similar to the AC voltage applied during the operation of the actual panel. The method of claim 1, The electrode defect inspection is a plasma display panel electrode defect inspection method, characterized in that immediately after the electrode is formed. In the electrode defect inspection method of the plasma display panel, A first step of exhausting / gas-injecting the front plate and the back plate of the electrode, the dielectric, and the seal layer forming process in a vacuum chamber equipped with a visible window; A second step of aligning the front plate and the back plate and performing discharge to inspect the defects of the electrodes of the front plate and the back plate; And Discharge observation through the visible window mounted on the vacuum chamber determines whether the electrode is defective or not, and if there is a defect, the front plate and the back plate are replaced without a sealing process, and if there is no defect, the sealing process is performed. 3rd step to proceed Electrode defect inspection method of the plasma display panel comprising a.