JPH11232370A - Production process management method and substrate provided with id - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the information of an ID code from being leaked to the outside by annexing an ID code to a substrate such as a glass substrate as production process managing information and destructing the ID code at proper time so that the information of the ID code can not be read out. SOLUTION: Information such as processing and conditions matched with each glass substrate is written in an QR code, which is utilized as an ID code and a processing method and a processing condition are determined in each glass substrate by reading out the contents of the QR code. When a glass substrate is prepared (S110) and an QR code including production process managing information such as processing methods and processing conditions is prepared in each glass substrate (S111), the contents of the QR code are read out on the prestages of respective processes (S120 to S144) and respective processes are executed by the processing methods and conditions based on the contents of the QR code. After the final process, the QR code is destructed by laser light so that the written QR code is not leaked to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for managing a production process of a substrate such as a glass substrate used for manufacturing a back plate and a front plate for a plasma display panel, and more particularly to a method for managing a production process of a substrate. The present invention relates to a production management method capable of preventing information of an ID code obtained from leaking to the outside.

[0002]

2. Description of the Related Art In recent years, plasma display panels (hereinafter, also referred to as PDPs) have been used in various display devices because of their small depth, light weight, clear display, and wide viewing angle compared to liquid crystal panels. It is being used.
Generally, a plasma display panel (PDP) has two
A pair of regularly arranged electrodes are provided on a pair of opposed glass substrates, and a gas mainly containing neon, xenon, or the like is sealed between the pair of electrodes. Then, a voltage is applied between these electrodes, and a discharge is generated in minute cells around the electrodes, so that each cell emits light and display is performed. In particular, in order to display information, regularly arranged cells are selectively discharged to emit light.

Here, the structure of the PDP is shown in FIG.
An example of the type PDP will be described. FIG. 6 is a perspective view of the PDP structure, but shows the front plate (glass substrate 610) and the rear plate (glass substrate 620) apart from the actual case for easy understanding. As shown in FIG. 6, two glass substrates 610 and 620 are arranged in parallel and opposed to each other, and both are barriers (cell barriers) provided in parallel on a glass substrate 620 serving as a back plate. 630)
Are held at regular intervals. On the back side of the glass substrate 610 serving as a front plate, composite electrodes composed of a transparent electrode 640 serving as a sustain electrode and a metal electrode 650 serving as a bus electrode are formed in parallel with each other.
A dielectric layer 660 is formed, and a protective layer (MgO layer) 670 is further formed thereon. In addition, on the front side of the glass substrate 620 serving as a back plate, an address electrode 680 is positioned between the barriers 630 so as to be orthogonal to the composite electrode.
Are formed in parallel with each other, and a fluorescent surface 690 is provided so as to cover the wall surface of the barrier 630 and the cell bottom surface. The barrier 630 is for defining a discharge space, and each partitioned discharge space is called a cell or a unit light emitting region.
This AC type PDP is of a surface discharge type, and has a structure in which an AC voltage is applied between composite electrodes on the front panel to cause discharge.
In this case, since the alternating current is applied, the direction of the electric field changes according to the frequency. Then, the phosphor 690 emits light by the ultraviolet light generated by the discharge, and the light transmitted through the front plate can be visually recognized by an observer. In addition, DC type PD
In the case of P, the electrode is different from the AC type in that the electrode has a structure not coated with the dielectric layer, but the discharge effect is the same. 6 has a structure in which a base layer 667 is provided on one surface of a glass substrate 620 and a dielectric layer 665 is provided thereon.
5 is not necessarily required.

An AC type plasma display (PDP) has been manufactured, for example, as shown in FIG. FIG. 5 shows an AC type PDP manufacturing process, in which a back plate and a front plate are manufactured in separate steps, respectively, and a PDP is assembled using both. In FIG. 5, S51-S55, S61-S65, S71-S7
Reference numeral 4 denotes a processing step. First, the manufacturing process of the back plate will be described. First, a glass substrate is prepared (S51), and a paste for a cathode (for electrode wiring) is printed in a predetermined pattern on the glass substrate by a thick film printing method, and dried and fired to form electrode wiring. (S52) Next, a barrier (also referred to as a barrier rib) is formed on the electrode wiring formation side of the glass substrate by a printing method or a sandblast method. (S53) In the case of the printing method, a barrier (barrier rib) forming paste is printed in a predetermined pattern on a glass substrate by a thick film printing method,
This is dried. The thickness of the barrier layer is large (for example, 160
(Thickness of 00 μm) Since this film thickness cannot be obtained by one thick film printing, printing and drying of the barrier forming paste are performed a plurality of times. After a predetermined film thickness is obtained, the paste is fired. In the case of the sand blast method, a barrier forming material is applied on a glass substrate, and after forming a predetermined resist pattern thereon, abrasive sand is sprayed to process the barrier forming material into a shape corresponding to the resist pattern. This is fired to form a barrier. Further, a paste for a phosphor (for example, a paste for a phosphor containing indium oxide) is printed in a predetermined pattern on the substrate on which the barrier is formed by a thick film printing method, and then dried and fired (S54). Form a faceplate. (S55)

Next, a process for manufacturing the front plate will be described. First, a glass substrate is prepared (S61), and a deposition layer of, for example, ITO (Indium Tin Oxide) is patterned on the glass substrate. (S61) The patterning is performed by a normal photolithography process (lithography technology). Next, three layers of Cr-Cu-Cr (chromium, copper, chromium) are formed by vapor deposition or sputtering, and a photolithography process (lithography technology) is performed similarly.
Patterned or printed with a predetermined pattern of electrode wiring paste to form a patterned ITO
An electrode wiring for discharge is formed together with the film. (S63) Next, a transparent dielectric layer is formed by solid printing of paste-like low melting point glass (S64), and a front plate is obtained. (S65)

Next, a PDP is manufactured using the back plate and the front plate thus obtained as follows. First, the front plate and the back plate are aligned, and in that state, lead glass for sealing is applied to the edges of both substrates, and then sealing is performed. (S71) Next, after the inside of the gap surrounded by both substrates (the back plate and the front plate) and the seal portion is exhausted through the exhaust pipe, the discharge gas is sealed in the above-mentioned gap through the exhaust pipe. . (S72) Thereafter, the exhaust pipe is burned off (chip off), and a driver IC is mounted (S73), and a PDP (Plasma Display Panel) is obtained. (S74)

As described above, the back plate and the front plate used in the production of the PDP are subjected to various processes to form an electrode wiring portion, a barrier portion, a phosphor portion, a dielectric layer portion, and the like. In addition, in each process, inspection and correction are added in each process, so that the quality and the history often differ for each glass substrate for forming the back plate and the front plate.
For this reason, a method of assigning an ID for production process management to the front surface or the back surface of each substrate is usually employed for checking the history and quality of each glass substrate. However, if the ID given to each glass substrate is leaked to the shipping destination together with the glass substrate or PDP in this way, internal information in the process of producing the glass substrate or PDP is leaked to the outside. Often occur.

[0008]

As described above, in the production of a plasma display panel, when an ID code is assigned to the back plate and the front plate used for the production process management, the ID information leaks to the outside. Therefore, there has been a demand for a method that can cope with this as easily as possible. The present invention corresponds to this, and uses a substrate such as a substrate used for manufacturing a back plate and a front plate for a plasma display panel with ID code information for production process management, and An object of the present invention is to provide a production process management method that can prevent information from leaking to the outside.

[0009]

According to the production process management method of the present invention, an ID code is provided as information for production process management on a substrate such as a glass substrate used for manufacturing a back plate and a front plate for a plasma display panel. The assigned ID code is destroyed so that the ID code information cannot be read, and the ID code information is prevented from leaking to the outside. And the ID code in the above has a cutout symbol for reading,
This is a two-dimensional ID code, characterized by destroying at least a cut-out symbol of reading the code. Further, the two-dimensional ID code having the above-described cutout symbol for reading is a QR code. Further, the above destruction is performed by irradiation with a laser beam.

[0010] The ID-attached substrate according to the present invention is characterized in that a two-dimensional ID code having a cutout symbol for reading is provided for production process management. The two-dimensional ID code having the above-described cutout symbol is a QR code. Further, the above-mentioned substrate is a substrate used for manufacturing a back plate or a front plate for a plasma display.

Here, the ID means individual information attached to each substrate, and the ID code is a code for attaching the individual information to each substrate, and is a two-dimensional ID code. Is a two-dimensional code for attaching the individual information to each substrate. Also, the matrix type two-dimensional ID code is as shown in FIGS.
The scanner 420 scans vertically and horizontally to capture the information of the ID code 410.
Reference numeral 20 generally denotes a CCD area sensor. At the time of reading, the ID code 410 is recognized and recognized in vertical and horizontal planes. Each ID code includes the position (angle) of the data code 411 (FIG. 4 (a) (a)) from the obtained image data. Since it has a mechanism for recognizing, it is possible to read from all directions of 360 °. Normally, a two-dimensional code is generally a data code 411 as shown in FIGS. 4A and 4B, and expresses information (code) in a sequence of black and white (presence or absence). Then, the L-shaped guide cell 415 recognizes a sequence of codes from the image data captured by the scanner. FIG. 4 (a)
As for the data code 411 as shown in (a),
Reading can be disabled by overwriting a write pattern and a negative-positive inverted pattern, but accuracy is required for write positioning. On the other hand, FIG.
The QR code 430 shown in FIG. 4 is usually composed of a data code part 431 for expressing information in dots and a cutout symbol 4 for recognizing the code part from an image read by a scanner.
It consists of 35. The cutout symbol 435 is obtained by converting the image data read by the scanner into a data code section 431.
Symbol mark having information for recognizing the position (angle) of the data code and the structure (dot size, pitch, etc.) of the data code section 431. Three cutting symbols 435
Is provided, the position (angle) of the data code section 431 is recognized from the image data read by the scanner, and the dot size of the data code section 431 is recognized based on, for example, the distance between the centers of the cutout symbols 435. Then, the dot pitch of the data code section 431 is recognized based on the size ratio between the outer circumference and the inner circumference of the rectangle of the cutout symbol 435. Since the QR code 430 has such a structure, it is possible to easily make the reading of the written contents impossible by destroying the constituent cells of the cutout symbol 435 by overwriting or the like. In the case of an ID code using a vapor-deposited film or a heat-resistant ceramic sheet, the written contents can be easily destroyed by laser irradiation. Overwriting or mechanical destruction so that the ID code cannot be read is referred to herein as ID code destruction.

[0012]

According to the production process management method of the present invention, by adopting such a structure, an ID code for production process management is provided on a substrate such as a substrate used for manufacturing a back plate and a front plate for a plasma display panel. Use with information added, and
It is possible to provide a production process management method that can prevent the ID information from leaking to the outside. Specifically, an ID code is given as information for production process management to a substrate such as a glass substrate used for manufacturing a back plate for a plasma display panel and a front plate, and the given ID code is timely assigned.
Destroy the ID code information so that it cannot be read.
By preventing the leakage of D-code information to the outside,
This has been achieved. As the ID code, a two-dimensional barcode having a cutout symbol for reading is preferable. The reason for this is that when used for process control, reading can be performed in all directions of 360 °, and in order to prevent reading of information, it is effective to destroy only the read symbol. As a two-dimensional barcode having a readout symbol, Q
R code. It is simple and practical to perform the destruction for preventing reading by irradiating the bar code with laser light.

[0013] The ID-attached substrate of the present invention has such a structure so that the production process can be controlled by the information of the ID code, and the ID code can be destroyed before the substrate is shipped to the outside. Information can be prevented from leaking to the outside.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described with reference to embodiments. First, a first example and a second example of an embodiment of a production process management method according to the present invention will be described with reference to FIG.
FIG. 1 is a manufacturing process diagram of a back plate for a PDP for describing a first example and a second example of an embodiment of a production process management method of the present invention. FIG. It is a figure showing an example of an embodiment. S110 to 160 in FIG. 1 indicate processing (process) steps. FIG. 2B is an enlarged view of the ID code section 120 when a QR code is used, and FIG. 3 is a view in which a cut-out symbol 125 and the like of the QR code 120A shown in FIG. It is shown.

First, a first example will be described. In the first example, a QR code for process management is provided on an end face of each glass substrate, and data such as a processing method and processing conditions in each process is written in a data code. In other words, when the processing method and processing conditions differ depending on the substrate, such as when there are many types, the information such as the processing and conditions suitable for each glass substrate is written in the QR code and used as the ID code, and the contents of the QR code are used. Is read to determine the processing method and processing conditions for each glass substrate. In addition, as shown in FIG. 2B, the QR code is preferably provided on the end face of each glass substrate in terms of work. In the case of the first example, a glass substrate is prepared (S11
0), a QR code provided with information for production process management such as a processing method and processing conditions is provided for each glass substrate (S111), and the contents of the QR code are stored in each process (S1).
20 to S144) (not shown), Q
Each step is performed with a processing method and conditions according to the contents of the R code. Then, after the final step, the QR code is destroyed by a laser beam so that the written QR code does not leak out. (S150) As shown in FIG. 3, the destruction of the QR code is to mechanically erase a cut-out symbol or a data code portion with a laser beam. 3A, only the cutout symbol 125 may be destroyed by laser irradiation, or as shown in FIG. 3B, the cutout siphonbol 125 and a part of the data code 123 may be destroyed. . Needless to say, all the QR codes may be destroyed. QR
The glass substrate with the broken code is a PDP
To the assembly process.

Next, a second example will be described. The second example is
In the manufacturing process of the back plate for PDP shown in FIG. 1, as a process management method mainly including inspection and correction (including quality control),
A QR code 120A as shown in FIG. 2 (b) is provided on the end face of each glass substrate for each back plate, and the final process is performed so that the written information of the QR code 120A does not leak outside. Later, the cutout symbol 125 of the QR code 120A is overwritten with a CO ₂ laser marker, thereby substantially destroying the QR code 120A. First, a glass substrate for a back plate is prepared. (S11
0) Next, a paste for a cathode (for electrode wiring) is printed in a predetermined pattern on a glass substrate by a thick film printing method, and the paste is dried.
Baking to form an electrode wiring. (S120) After forming the electrode wiring, a defect inspection accompanied by image processing and an electrical continuity inspection are performed by a probe, and a disconnection, a short circuit, and other shape defects of the wiring are extracted. After the inspection, information corresponding to the inspection result is written on the end face of each glass substrate by a QR code.
(S122) After the inspection, each glass substrate is sent to the next electrode wiring defect correction step. First, the content of the QR code written in the previous inspection step is read for each substrate (S12).
3), processing is performed in response to this. If necessary, the correction result is also written using a QR code. (S124) Next, a barrier (also referred to as a barrier rib) is formed on the electrode wiring formation side of the glass substrate by a sandblast method. (S130) After the barrier is formed, the concave defect and the convex defect of the barrier portion are extracted by an optical visual inspection or a defect inspection involving image processing. After inspection,
Information corresponding to the inspection result is written on the end face of each glass substrate.
Write with R code. (S132) After the inspection, each glass substrate is sent to the next barrier defect correction step. First, the content of the QR code written in the previous inspection step is read for each substrate (S133). Process corresponding to. If necessary, the correction result is also written using a QR code. (S134) Further, a paste for a phosphor (for example, a paste for a phosphor containing indium oxide) is printed in a predetermined pattern on the glass substrate on which the barrier is formed by a thick film printing method, and then dried and fired. . (S140) After the phosphor paste forming step, the inspection step (S141) and the correction step (S144) are performed as necessary. In this case, too, after the inspection step (S141), writing of a QR code (S142) The QR code is read (S143) before the correction step (S144). Next, with the CO ₂ laser marker, Q
The cut symbol of the R code is overwritten to destroy the QR code. (S150) As shown in FIG. 3B, the QR code is composed of a data code 123 and a cutout symbol 125. By overwriting the cutout symbol 125 with a CO ₂ laser marker, the QR code is read by the scanner.
3 cannot be read out.

FIG. 1 shows an example in which the production control method of the present invention is applied to the process of the back plate, but it is needless to say that the method can also be applied to the process of the front plate. Further, the present invention can be applied to all processes in which processing is performed using a substrate other than a PDP. FIG.
Since the QR code is destroyed in the back plate manufactured in the process shown in (1), the information represented by the QR code in the production process does not leak to the outside.

Next, an example of an embodiment of an ID-attached substrate according to the present invention will be described with reference to FIG. 2 and 3, 110
Is a substrate (glass substrate), 120 is an ID code part, 120
A is a QR code, 123 is a data code, 123A is a destroyed data code, and a 125 cutout symbol. As shown in FIG. 2A, if the ID code portion 120 is provided on the end face of the substrate 110, even if a large glass substrate such as a PDP is put in a case or the like, for example, the end face of the end face can be obtained. The ID code section 120 can be read by a scanner. In addition, the ID code section 120 is
If provided on the end face of 10, an electrode substrate or the like can be efficiently formed on the glass substrate. ID code part 1
As 20, a two-dimensional ID code is preferable in terms of the degree of freedom of the angle of the scanner at the time of reading.
The QR code 120A as shown in FIG. 2B is preferable because it is easily broken. As the material of the ID code portion 120, it is preferable to use a material that can cope with the processing of each glass substrate. In particular, in order to destroy the information of the ID code section 120 by irradiating the laser beam,
It is preferable that 0 is formed by a vapor deposition film or a heat-resistant ceramic sheet.

[0019]

According to the present invention, as described above, a substrate such as a substrate used for manufacturing a back plate and a front plate for a plasma display panel is provided with ID code information for production process management and used. In addition, it is possible to provide a production process management method that can prevent the ID information from leaking to the outside.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a production process management method according to the present invention.
Of manufacturing the back plate for PDP showing the example of Example 1 and the example 2 of Example

FIG. 2 is a diagram showing an example of an embodiment of a substrate according to the present invention.

FIG. 3 is a diagram in which a QR code is destroyed.

FIG. 4 is a diagram for explaining a two-dimensional ID code;

FIG. 5 is a process chart for explaining a PDP manufacturing process.

FIG. 6 is a diagram illustrating a PDP substrate.

[Explanation of symbols]

 110 substrate (glass substrate) 120 ID code section 120A QR code 123 data code 123A destroyed data code 125 cutout symbol 410 ID code 411 data code 415 L-shaped guide cell 420 scanner 425 scan line 430 QR code 431 data code 435 cutout symbol

Claims (7)

[Claims] 1. A substrate such as a glass substrate used for manufacturing a back plate and a front plate for a plasma display panel,
An ID code is provided as information for production process management, and the provided ID code is destroyed in a timely manner so that the ID code information cannot be read, thereby preventing leakage of the ID code information to the outside. Production process management method. 2. The ID code according to claim 1, wherein the ID code is a two-dimensional ID code having a read-out symbol.
A production process management method characterized by destroying at least a cutout symbol for reading the code. 3. The production process management method according to claim 2, wherein the two-dimensional ID code having the cut-out symbol for reading is a QR code. 4. The production process management method according to claim 1, wherein the destruction according to claim 1 is performed by irradiating a laser beam. 5. An ID-attached substrate provided with a two-dimensional ID code having a readout symbol for production process management. 6. A substrate with an ID, having a cutout symbol for reading according to claim 5, wherein the two-dimensional ID code is a QR code. 7. A substrate with an ID, wherein the substrate according to claim 5 or 6 is a substrate used for manufacturing a back plate or a front plate for a plasma display.