KR20050071227A - Ink-jet coating method for manufacturing plasma display panel - Google Patents

Abstract

The present invention relates to an inkjet coating method for fabricating a plasma display panel capable of injecting phosphor ink in a cell region by recognizing a black matrix (BM) formed on a partition wall. Monitoring the black matrix BM on the partition wall formed at the next injection position; Determining whether the partition wall is deformed through the black matrix monitoring; As a result of the determination, when the deformation of the partition wall occurs, adjusting the tilting angle or the X position value of the inkjet head and then injecting the phosphor ink to the next ejection position, by spraying the phosphor ink in the correct position, the high-quality screen There is an effect that can be obtained.

Description

Inkjet Coating Method for Plasma Display Panel Production {INK-JET COATING METHOD FOR MANUFACTURING PLASMA DISPLAY PANEL}

The present invention relates to an inkjet coating method for fabricating a plasma display panel, and more particularly, to an inkjet coating method for fabricating a plasma display panel capable of spraying phosphor ink onto a cell region by recognizing a black matrix (BM) formed on a partition wall. will be.

As the development and spread of information processing systems increase, the importance of display devices as visual information transmission means is increasing. In particular, the conventional CRT (Cathode Ray Tube) has various problems such as large size, high operating voltage, and display distortion, so the recent trend toward larger screen size and flatness is not suitable. High brightness, high efficiency, high resolution, high speed response characteristics, long life, low driving voltage, low power consumption, low cost and full-color flat panel display (FDP) are urgently required.

FPDs currently under development and production include Liquid Crystal Display (LCD), Organic Electro-Luminescence (OEL), Inorganic EL, Field Emission Display (FED), Plasma Display Panel (PDP), and Electronic Ink.

Since the market share war of these technologies is not only high performance but also realization of low price, the development of low cost process to replace the conventional mainstream screen printing method and photo lithography process has been made continuously.

Screen printing is a simple process that is simple and inexpensive to use, but it is not suitable for high-definition applications because of its poor thickness and width uniformity. The physlithography process has excellent thickness, uniformity and thin film thickness. Although it can be applied to a fixed tax because it is possible to do so, there are disadvantages in that the material is expensive, lossy, and complicated manufacturing process and expensive equipment.

In that respect, the inkjet printing method has recently attracted much attention as a device intensive in various places and a low cost process.

Applicable uses are all applicable to the process for pattern formation of FDP, and are especially used for color filter formation, alignment film, phosphor formation, electrode formation, dielectric layer formation, etc.

1 is a flowchart showing a process chart of an inkjet coating apparatus for manufacturing a conventional display panel. As shown, after setting a plurality of inkjet heads and loading the ink, the nozzle face of the set head is cleaned and the nozzle positions are aligned.

Once the nozzle position is aligned, the substrate is loaded into the X-Y stage and the loaded substrate is aligned.

When the substrate is aligned, inkjet printing is performed, the pattern is closely inspected, and the post processor is then processed.

2 is a view illustrating a tilting structure of a plurality of inkjet heads of an inkjet coating apparatus for manufacturing a conventional display panel. As shown, each of the plurality of heads can be tilted according to the pitch of the pattern to be implemented, which is to correspond to each resolution stack, all heads in one flow. The process is finished, so it is placed at the correct intervals

If the device is applied to R, G and B color filter manufacturing processes such as PDP and LCD, three groups of inkjet heads are attached according to each of R, G and B types.

3 is a block diagram of a conventional device for securing positional accuracy. As shown, the alignment of the nozzle and the substrate of the inkjet head is essential to form an accurate pattern for the substrates to be loaded. Two charge-coupled device (CCD) cameras and two CCD2 cameras have a head nozzle facing downward. From bottom to top, and attached to the XY stage, the ink was sprayed at the correct pitch and position by always aligning the first and last nozzles.

CCD3 and CCD4 cameras were installed to ensure positional accuracy whenever substrates were loaded in succession.

However, PDP has a problem such as shrinkage of the panel due to frequent firing process, and in particular, the deformation of the outer partition wall is irregular, so even when the nozzles are correctly arranged, there is a problem that it is difficult to obtain a reliable high-quality PDP because the phosphor coating is not uniform.

Accordingly, in view of the above problems, the present invention includes a CCD camera capable of recognizing a black matrix (BM), and the CCD camera is positioned at the last nozzle of the next jetting position of the inkjet head to eject ink from the inkjet head. By monitoring the trajectory of the bulkhead, the degree of deformation of the bulkhead can be checked to adjust the tilting angle or X position of the inkjet head, and inkjet coating for fabrication of a plasma display panel capable of obtaining a high-quality screen by spraying phosphor ink at the correct position. The purpose is to provide a method.

The present invention for achieving the above object comprises the steps of monitoring a black matrix (BM) on the partition wall formed at the next ejection position of the last nozzle provided in the inkjet head during the phosphor ink ejection; Determining whether the partition wall is deformed through the black matrix monitoring; As a result of the determination, the deformation of the partition wall is characterized in that the step of adjusting the tilting angle or X position value of the inkjet head and then spraying the phosphor ink to the next injection position.

In addition, the monitoring of the black matrix formed on the partition wall is characterized in that made by a charge-coupled device (CCD) camera.

A preferred embodiment of an inkjet coating method for fabricating the present invention plasma display panel having the above characteristics will be described with reference to the accompanying drawings.

Figure 4 shows the process of an embodiment of an inkjet coating method for manufacturing a plasma display panel of the present invention. As shown, positioning a CCD camera at the last nozzle of the next jetting position of the inkjet head, monitoring the black matrix (BM) on the partition where the CCD camera is located during phosphor ink jetting, and monitoring the bulkhead through the BM monitoring. Determining the degree of deformation, and as a result of the determination, when the deformation of the partition wall occurs, adjusting the tilting angle or the X position value of the inkjet head and then spraying the phosphor ink at the next injection position.

In addition, when the determination resulted that the deformation of the partition wall did not occur, that is, the partition wall does not deviate by more than a predetermined value, the method further includes the step of ejecting the phosphor ink at the next ejection position without adjusting the ink jet head, and repeating this process. Perform.

In order to carry out the present invention, a CCD camera (hereinafter referred to as a CCD5 camera) for monitoring the BM formed on the partition wall in the system configuration shown in FIG. 2 should be further configured. The inkjet head and the CCD5 camera are spaced apart at regular intervals, and the inkjet head and the CCD5 camera may be moved separately or connected together.

Then, the operation of the present invention made of the above steps will be described with reference to FIG.

First, the inkjet head is positioned at the position A at which the phosphor ink is to be ejected, and the CCD5 camera is positioned at the last nozzle position of the inkjet head to be placed at the next ejection position B. FIG. At this time, the CCD5 camera monitors the BM formed on the partition wall where the last nozzle is located.

When the panel is moved in the Y-axis direction to inject the phosphor ink onto the lower substrate of the PDP, the phosphor ink ejected from the inkjet head is applied to the cell region between the partition walls located in the A region, and at the same time, located at the last nozzle of the next ejection position. The BM formed on the bulkhead is monitored by a CCD5 camera.

The BM monitoring determines the degree of deformation of the partition wall placed at the next injection position B of the inkjet head. That is, the degree of deformation is determined based on the degree to which the location of the partition wall is out of the predetermined position.

Through the above determination, it is determined whether or not to emit the phosphor ink in the state of the currently set inkjet head at the next position, or after adjusting the tilting angle or the X position value of the inkjet head. That is, as a result of the BM monitoring of the CCD5 camera, if no deformation occurs in the partition wall, the phosphor ink is sprayed at the next position of the currently set inkjet head, and if the deformation of the partition wall occurs, the inkjet head state is set to the currently set inkjet head state. Without ejecting the phosphor ink, the tilting angle or X position value of the inkjet head is adjusted and the phosphor ink is ejected at the next position.

Here, when the tilting angle of the inkjet head is adjusted, the degree of deformation of the partition wall is severe, and the location of the partition wall deviates much from a predetermined position. This is not the case. For example, if a predetermined value is set and the partition is deformed larger than the preset value, the tilting angle of the inkjet head is adjusted, and if the deformation is smaller than the preset value, the phosphor is adjusted after the X position value of the inkjet head is adjusted. Spray ink. In addition, the tilting angle and the X position value of the inkjet head may change according to circumstances.

Such deformation of the barrier rib (e.g., shrinkage and warpage) is likely to occur on the left and right sides of the PDP, and thus, it is necessary to adjust the tilting angle or the X position value of the inkjet head when the phosphor ink is injected into the cell regions located on the left and right sides of the panel.

As described above, the present invention can adjust the tilting angle or the X position value of the inkjet head according to the deformation of the partition wall by monitoring the BM using the equipped CCD camera to spray the phosphor ink at the correct position of the panel.

As described in detail above, the present invention includes a CCD camera capable of recognizing a black matrix (BM), the CCD camera being positioned at the last nozzle of the next jetting position of the inkjet head, and the partition wall during ink ejection from the inkjet head. By monitoring the trajectory of, it is possible to check the deformation degree of the partition wall, adjust the tilting angle or the X position value of the inkjet head, and spray the phosphor ink at the correct position to obtain a high quality screen.

1 is a process chart of an inkjet coating apparatus for manufacturing a conventional display panel

2 is an exemplary view showing a tilting structure of a plurality of inkjet heads of an inkjet coating apparatus for manufacturing a conventional display panel.

3 is a block diagram of a device for securing a conventional position accuracy.

Figure 4 is a flow chart for the inkjet coating method for producing a plasma display panel of the present invention.

Fig. 5 is an illustration of the tilting structure of the inkjet head and the position of the CCD camera according to the present invention.

Claims (3)

Monitoring the black matrix (BM) on the partition wall formed at the next ejection position of the last nozzle provided in the inkjet head during the phosphor ink ejection; Determining whether the partition wall is deformed through the black matrix monitoring; In the determination result, when the deformation of the partition wall occurs, adjusting the tilting angle or the X position value of the inkjet head and spraying the phosphor ink to the next injection position, characterized in that the inkjet coating method for manufacturing a plasma display panel . The method of claim 1, wherein the monitoring of the black matrix formed on the partition wall is performed by a charge-coupled device (CCD) camera. The plasma display panel of claim 1, wherein the tilting angle of the inkjet head is adjusted when the deformation of the partition wall is larger than a predetermined value, and the X position value of the inkjet head is adjusted when it is smaller than the predetermined value. Inkjet application method for the.