JP2009156964A - Liquid crystal display and method for manufacturing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a liquid crystal display in which an identification mark is given to each liquid crystal cell, thereby attaining high traceability. <P>SOLUTION: A transparent film formed on a substrate is processed to a predetermined pattern 11 for liquid crystal display and patterns of two-dimensional bar codes 21, 22. The information represented by the two-dimensional codes 21, 22 may include manufacturing conditions. Thus, in the subsequent process to the patterning process, the two-dimensional bar codes 21, 22 are imaged, the manufacturing conditions are read from the obtained image, and the manufacturing process is performed according to the read manufacturing conditions, so that a mistake in setting the manufacturing conditions by a worker is reduced. Further, after the completion, the two-dimensional bar code 21 is read to directly confirm the manufacturing conditions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device including a transparent film patterned into a desired shape.

  Conventional liquid crystal cells used in liquid crystal display devices are conventionally manufactured by the following manufacturing method. First, a transparent conductive film such as ITO (Indium Tin Oxide) is vapor-deposited on a glass substrate, and after applying a photoresist, a photomask is set in an exposure machine, and a desired pattern is exposed. After the exposure, the transparent conductive film is processed into a desired electrode pattern by developing, etching, and peeling processes. An alignment film is applied on the ITO film by a flexographic printing machine or an ink jet coating apparatus. Note that an insulating film may be applied before applying the alignment film. Thereafter, the alignment film is rubbed. After spraying a gap control agent on the two substrates that have been subjected to the rubbing process, a sealant is printed, and the alignment films are overlapped so as to face each other, and then divided into a plurality of liquid crystal cells. Then, after injecting a liquid crystal material between the two substrates of each liquid crystal cell, sealing is performed, and polarizing plates are attached to both outer side surfaces. Thereby, a plurality of liquid crystal cells are completed.

  Thus, in the production of the liquid crystal cell, the transparent conductive film forming process and the resist coating, patterning, exposure, development, etching and peeling processes for the patterning, the alignment film coating process, the rubbing process, and the gap control are performed. An agent spraying step, a sealing agent printing step, an overlaying step, a dividing step, a liquid crystal cell injection step, a sealing step, and a polarizing plate pasting step are necessary, and the manufacturing process is complicated. Conventionally, the management of each of these processes is performed by flowing a process management table on the line for each substrate lot or cassette, and the manufacturing conditions written in the process management table are checked by the operator of each process. A method is used in which the process is set in a manufacturing apparatus.

  On the other hand, in Patent Document 1, in order to manage the manufacturing process of a semiconductor device, a chip ID and a frame ID are used as a two-dimensional barcode pattern in a photolithography process of a metal wiring performed near the final process of a semiconductor wafer process. In addition, it is disclosed to perform projection exposure and marking for each chip and each frame. As a result, for example, by reading the chip ID and collating it with the mapping data, it is possible to reduce the incidence of erroneous pickup of the chip in the die bonding process.

Patent Document 2 discloses that an identification mark such as a two-dimensional barcode is provided at a predetermined coordinate position of a layer that can be visually identified in a color filter or the like of a liquid crystal display device. Accordingly, it is possible to distinguish the color filter types that are difficult to distinguish visually by the position where the identification mark is provided and the two-dimensional barcode information.
Japanese Patent Laid-Open No. 11-26333 JP 2004-219725 A

  Like the conventional liquid crystal display device described above, the method of managing the manufacturing process with the process management table is a process because the process management table for a plurality of substrates such as for each lot or for each cassette flows on the line for each lot or for each cassette. The unit of management is a lot or cassette, and process management for each substrate is not performed. In addition, when an operator makes a mistake in setting manufacturing conditions, a defect occurs, but it is difficult to verify later in which process the defect has occurred. Usually, after inspecting the substrate before division, the operator marks the serial number, but the relationship with the manufacturing lot of the large board of the substrate cannot be grasped from the serial number. Further, the manufacturing conditions cannot be directly grasped directly from the product serial number, and the manufacturing conditions can be known only after referring to the process chart. Furthermore, when the operator has made a mistake in setting the manufacturing conditions, the manufacturing conditions are different from the process chart, and the manufacturing conditions cannot be known. When the substrate is divided into liquid crystal cells, the production number is not known, and the relationship with the production conditions is not known, so the traceability is low.

  On the other hand, in the liquid crystal display device, the members excluding the color filter are constituted by a transparent body due to the property. For this reason, the techniques of Patent Document 1 and Patent Document 2 in which a colored layer is processed to form a two-dimensional barcode cannot be applied to a liquid crystal cell main body in which no color filter is arranged.

  An object of the present invention is to provide a manufacturing method of a liquid crystal display device having an identification mark for each liquid crystal cell and having high traceability.

  In order to achieve the above object, according to the present invention, there is provided a method for manufacturing a liquid crystal display device, wherein a transparent film formed on a substrate is converted into a predetermined pattern and a two-dimensional barcode pattern for liquid crystal display. A manufacturing method having a patterning step to be processed is provided. Thereby, even if it is an apparatus formed from a transparent body like a liquid crystal display device, an identification mark can be formed by comprising a two-dimensional barcode with a transparent film.

  The information represented by the two-dimensional barcode formed in the patterning process can include manufacturing conditions. In a step subsequent to the patterning step, a two-dimensional barcode can be imaged, a manufacturing condition can be read from the obtained image, and the manufacturing step can be performed according to the read manufacturing condition. Thereby, it becomes possible to reduce the setting mistake of the manufacturing conditions by an operator. Further, by reading the two-dimensional barcode after completion, the manufacturing conditions can be confirmed directly.

  In a process after the patterning process, as a manufacturing line, one or more manufacturing apparatuses for performing the manufacturing process, a sensor that captures an image of the two-dimensional barcode, and a manufacturing condition represented by the two-dimensional barcode from the image are set. It is possible to use an apparatus including a reading unit that reads out and a setting unit that sets the read manufacturing conditions in one or more manufacturing apparatuses. Thereby, since the manufacturing conditions read from the two-dimensional barcode can be automatically set in the manufacturing apparatus, an operator's setting mistake can be prevented.

  A transparent conductive film can be used as the transparent film. Since the transparent conductive film is patterned into a predetermined electrode shape, a two-dimensional barcode can be formed without increasing the number of steps by simultaneously processing the two-dimensional barcode pattern.

  When imaging a two-dimensional barcode, irradiate white light and reflect light from the transparent film that makes up the two-dimensional barcode. One dot of the two-dimensional barcode corresponds to five or more pixels of the imaging pixel. It is preferable to pick up an image at a magnification. By reading under these conditions, even a two-dimensional barcode formed of a transparent film can be read with high accuracy in a bright room.

  When imaging a two-dimensional barcode, it is possible to arrange a black plate on the surface opposite to the illumination of the substrate.

  In addition, according to the present invention, the following liquid crystal display device is provided. That is, a liquid crystal display device having a pair of opposed transparent substrates, a transparent film mounted on at least one of the pair of transparent substrates, and a liquid crystal sandwiched between the pair of transparent substrates. The part is processed into the shape of a two-dimensional barcode.

  As the transparent film, a transparent electrode film disposed on the opposing surfaces of a pair of transparent substrates can be used. The information represented by the two-dimensional barcode can include manufacturing conditions set in the manufacturing process of the liquid crystal display device. The two-dimensional barcode is preferably arranged outside the display area.

  A liquid crystal display device according to an embodiment of the present invention will be described with reference to the drawings.

  In the method for manufacturing a liquid crystal display device according to the present embodiment, a pattern of a two-dimensional barcode is simultaneously formed when patterning a transparent film formed on a substrate. The two-dimensional barcode of the transparent film has a low contrast and is usually difficult to read, but can be read by imaging under predetermined conditions. The information represented by the two-dimensional barcode includes not only ID identification information of the substrate but also manufacturing condition information to be performed on the substrate. Thereby, in the manufacturing process after giving a two-dimensional barcode, it manufactures by setting the manufacturing conditions read from the two-dimensional barcode to a manufacturing apparatus.

  Hereinafter, a method for manufacturing the liquid crystal display device of the present embodiment will be described. First, the structure of the liquid crystal display device manufactured by this manufacturing method will be described. This liquid crystal display device has a configuration in which a backlight and a drive circuit (not shown) are connected to the liquid crystal cell having the configuration shown in FIG. The display format of the liquid crystal cell is a dot matrix display. Here, a simple matrix display will be described as an example. The liquid crystal cell of FIG. 1 has a structure in which two glass substrates 10 are opposed to each other with a predetermined interval, a liquid crystal 13 is filled therebetween, and the periphery is sealed with a main sealing material 14. A transparent electrode film 11, an insulating film 20, and an alignment film 12 are laminated on the opposing surfaces of the two glass substrates 10, respectively. As the transparent electrode film 11, an ITO film is used here as an example, but other transparent conductive films such as a tin oxide film and a zinc oxide film can also be used.

  As shown in FIG. 1, a conductive material 15 is disposed outside the main seal material 14 to enable power supply from the one glass substrate 10 side to the transparent electrode film 11 of the other glass substrate 10. In addition, polarizing plates 16 are disposed on the outer sides of the two glass substrates 10, respectively.

  One transparent electrode film 11 of the pair of substrates 10 is arranged in parallel with the display region 23 for simple matrix display, as shown in the overall view in FIG. 2 and the partially enlarged view in FIG. It is patterned into a predetermined electrode shape including a plurality of line-shaped electrodes. The transparent electrode film 11 of the other substrate 10 has an electrode shape including a plurality of line electrodes arranged in a direction orthogonal to the line electrode of the transparent electrode film 11 of the one substrate 10.

  Further, the transparent electrode film 11 is patterned not only in the above-described electrode shape but also in the shape of the two-dimensional barcode 21 as shown in FIG. As is widely known, the two-dimensional barcode 21 has features such as a large amount of information, high density printing, and a data error detection function and a correction function. Here, an example of using a QR code (registered trademark) as a two-dimensional barcode will be described, but other two-dimensional barcodes such as Data Matrix, Veri Code, PDF417, Code 49, and Maxi Code (all are registered trademarks) should be used. Is also possible.

  In addition to product information (product name, exposure date, lot number, manufacturing condition of ITO film (transparent electrode film 11), etc.), information indicated by the two-dimensional barcode 21 indicates production condition data, that is, a process process. Contains data. The process process data includes material names (insulating film 20, alignment film 12, main seal material 14, end seal agent, gap control agent, liquid crystal 13, chiral agent added to liquid crystal 13, etc.), insulating film 20 and alignment film 12. Heat treatment conditions, alignment film 12 printing conditions (flexo printing, ink jet printing, screen printing, dispensing condition types and conditions, etc.), rubbing process rubbing conditions (clearance, rubbing direction, rotation speed, etc.), gap control agent spraying Process conditions (spraying amount, etc.), conditions for overlaying two substrates 10 (positions of alignment marks, press pressure, temporary fixing conditions), hot press conditions for two substrates 10 (temperature, time, pressure, etc.) ) Conditions for scribing to the substrate 10 in the dividing process (alignment mark, cut program number, scribing pressure) Etc.), Breaking conditions (pressure, program number, etc.) of the substrate 10 in the division process, injection process conditions (vacuum degree, dip time, etc.) of the liquid crystal 13, press end seal conditions (press conditions, time, UV irradiation amount, etc.) , Assembly conditions (material, direction, size, etc. of polarizing plate 16, material, direction, size, etc. of optical compensator (not shown), flexible wiring, backlight type, etc.) are included. In addition to the above, it is also possible to add information such as an imposition position (position information of the transparent electrode film 11 pattern in the large substrate 10).

  The pattern of the transparent electrode film 11 in FIG. 2 shows a pattern of one liquid crystal cell, but at the time of manufacture, as shown in FIG. 4, a plurality of large substrates 10 called large plates (nine in FIG. 4) are provided. The patterns of the transparent electrode film 11 of the liquid crystal cell are formed side by side and divided into nine liquid crystal cells in a dividing step. In this case, the two-dimensional barcode 22 is formed by the transparent electrode film 11 at the end of the large substrate 10. The information indicated by the two-dimensional barcode 22 is the same as the information of the two-dimensional barcode 21. In the example of FIG. 4, since it is easy to secure a space for providing the two-dimensional barcode 22 at the end of the large board 10, the two-dimensional barcode 21 for each substrate 10 after the division is divided. The size is larger than that.

  Next, a manufacturing method of the liquid crystal cell will be described with reference to FIG.

  First, in step 501, a large glass substrate 10 having an ITO film formed on the entire surface is prepared, and this is converted into the pattern of the transparent electrode film 11 and the pattern of the two-dimensional barcodes 21 and 22 as shown in FIG. Process.

  Specifically, a resist is coated on the entire glass substrate 10 with the ITO film, and the patterns of the transparent electrode film 11 and the two-dimensional barcodes 21 and 22 are exposed using a laser direct drawing apparatus. As the exposure device, one having a configuration in which light from a light source is irradiated onto a DMD (Digital Micromirror Device) and the light reflected by the DMD is irradiated onto the resist. The light source is a 405 nm semiconductor laser. As the resist, a positive type resist (a portion that does not receive light remains) is used here. Therefore, select the light of the light source from the DMD of the exposure machine according to the pattern to be exposed in advance so that the part to be left is not irradiated with light and the part to be removed (development) is irradiated with light on the resist. The resist is exposed. For example, the design (CAD) data of the transparent electrode film 11 and the two-dimensional barcodes 21 and 22 prepared separately in advance is transferred to the exposure machine, and the operation of the DMD is controlled by the exposure machine. Thus, it is not necessary to manufacture a photomask, and it can be mass-produced immediately after design.

  As shown in FIG. 4, the two-dimensional barcode 22 for the large board 10 is formed in an area where the conventional product name is written at the end of the large board 10. The two-dimensional barcode 21 is exposed to the area where the conventional imposition number has been written on the divided substrate 10.

  After exposure, the positive resist is developed and post-baked, the ITO film is etched, and the resist is removed. Thereby, the transparent electrode film 11 and the two-dimensional barcodes 21 and 22 of FIGS. 2 to 4 are formed.

  As in this process, by using a direct drawing exposure machine using DMD, the transparent electrode film 11 and the two-dimensional barcodes 21 and 22 having different patterns can be formed on the substrate 10 each time. It is possible to write a two-dimensional barcode pattern containing necessary information for each substrate 10 and for each cell.

  Next, the insulating film 20 is formed on the transparent electrode film 11 by an insulating film forming step 502. As shown in FIG. 6, the manufacturing line used in the manufacturing method of the present embodiment includes a manufacturing apparatus (printing machines 64, 65, etc.) and a substrate transport apparatus 66 for performing each process. In each step, a sensor 61, a reading unit 62, and a manufacturing condition setting unit 63 are arranged. The sensor 61 images the two-dimensional barcodes 21 and 22 on the substrate 10. The reading unit 62 has a positioning function, a pattern recognition function, and a barcode reader function, processes an image captured by the sensor 61, recognizes a pattern, and reads information represented by the two-dimensional barcode. The manufacturing condition setting unit 63 selects process process data for the process (insulating film forming process 502) from the information read by the reading unit 62, and uses the data (manufacturing conditions) as a manufacturing apparatus ( In step 502, it is set to a printing press. The substrate 10 is moved between the processes by the transfer device 66.

  Here, the sensor 61 has a resolution of 640 × 480 pixels and a 1/3 inch CCD. As shown in FIGS. 7A and 7B, the illumination is coaxial epi-illumination, and the illumination light source 73 is a white light source. A matte black plate 74 is disposed on the back side of the substrate 10.

  The two-dimensional barcodes 21 and 22 formed of a transparent conductive film on the transparent substrate 10 usually have low contrast and are difficult to recognize, but using an optical system as shown in FIGS. By adjusting the distance between the sensor 61 and the substrate 10, the image is enlarged to a size that can allocate 5 pixels or more of the CCD pixels to one dot of the barcode. Thereby, it is possible to accurately recognize not only in a dark room environment but also in a production line with disturbance light. That is, in the case of the large substrate 10 before the division, in order to read the large two-dimensional barcode 22 at the end of the large substrate 10, the sensor 61 and the substrate 10 are connected as shown in FIG. When the distance is increased and the two-dimensional barcode 22 of each divided substrate 10 is read, the distance between the sensor 61 and the substrate 10 is decreased as shown in FIG. This expands the size so that 5 or more CCD pixels are allocated to one dot of the barcode.

  Therefore, the minimum size of the two-dimensional barcode size 21 or 22 is a minimum size that can be expanded to a size that allocates five pixels of the CCD pixel of the sensor 61 to one dot of the barcode. The maximum size depends on the number of CCD pixels of the sensor 61. If the size of the 2D barcode is 5.25x5.25mm (0.25mm square is 21 rows) and the number of pixels of the CCD is 640x480 pixels, the 2D barcode of 96x96 pixels is the maximum from the above conditions. It becomes. 7A and 7B, the sensor 61 is disposed above the substrate 10, but it is also possible to photograph the two-dimensional barcodes 21 and 22 from the back side of the substrate as shown in FIG. It is.

  8 and 9 are photographs of a display screen showing an image obtained by actually reading the two-dimensional barcode 21 with the sensor 61 and a character string read from the two-dimensional barcode 21 by recognition. As shown in FIG. 8 and FIG. 9, it can be seen that the character string indicated by the barcode is read with an error number of 0 even though the orientation of the two-dimensional barcode 21 is not constant. The examples of FIGS. 8 and 9 are examples in which the two-dimensional barcodes 21 and 22 are read from the back surface of the substrate 10. As a feature of the two-dimensional barcode, even if a part (10 to 30%) of the barcode pattern is soiled or missing, it can be restored and read.

The reading unit 62 reads from the two-dimensional barcode 21 or 22 the material of the insulating film 20 (SiO ₂ (mixed with organic substance and SiO ₂ so that it can be printed)), thickness (800-1000 angstrom, refractive index about 1.5). , Transmittance 95% or more), forming method (flexo printing method → leveling 1 minute → temporary drying 60 ° C., 3 minutes, hot plate (multistage) → UV irradiation (irradiation conditions) → heat treatment 270 ° C. 2 hours (using clean oven) ). The manufacturing condition setting unit 63 sets this condition in the printing machine 64. The printer 64 prints the alignment film 12 with the set material and conditions. Thereby, setting mistakes can be eliminated as compared with the case where the operator makes settings. In addition, about the large board | substrate 10 before a division | segmentation, a manufacturing condition can be easily read by reading the two-dimensional barcode 22 with a big size.

  Next, the process proceeds to an alignment film forming step 503 to form the alignment film 12. Similar to step 502, the reading unit 62 reads information about the alignment film forming step represented by the two-dimensional barcode 22 from the image read by the sensor 61. Thereby, the material of the alignment film 12 (for example, polyamic acid type or soluble polyimide), thickness (500-800 angstrom), refractive index (about 1.5), transmittance (95% or more), formation method (flexographic printing) Method → Leveling 1 minute → Temporary drying 60 ° C, 3 minutes, Hot plate (multistage) → Heat treatment 200 ° C, 1.5 hours (using a clean oven)), flexographic printing machine printing conditions (clearance, substrate transport speed, plate Read model number, type of printing material, etc.). The manufacturing condition setting unit 63 sets this condition in the printing machine 65. The printer 65 prints the alignment film 12 with the set material and conditions.

  Next, the alignment film 12 is rubbed by a rubbing step 504. Similar to step 502, the reading unit 62 reads the conditions of the rubbing step from the image of the two-dimensional barcode 22 captured by the sensor 61. That is, the rubbing conditions include the angle of the roller (substrate), the number of rotations of the roller, the moving speed of the roller (substrate), the clearance (distance between the substrate and the roller), the cloth condition, and the like. The manufacturing condition setting unit 63 sets this condition in the rubbing apparatus. The rubbing apparatus performs a rubbing process on the alignment film 12 under the set conditions.

  Next, a gap control agent spraying and seal printing step 505 is performed. From the image of the two-dimensional barcode 22 photographed by the sensor 61, the reading unit 62 reads the gap control agent spraying condition and the printing condition of the main seal material 14. That is, the gap control spraying conditions (air (nitrogen gas) flow rate, applied voltage to the electron gun, gap control agent type, particle size, spraying amount, etc.), the finished line width of the main sealant 14, and the printing method (screen printing) Conditions (squeegee pressure, moving speed, screen plate number, etc.) or dispenser printing conditions (head-substrate distance, head (substrate) moving speed, head type, discharge pressure, etc.)). The manufacturing condition setting unit 63 sets these conditions for the spreader and the printing machine, respectively. The spreading machine and the printing machine spray the gap control agent under the set conditions, and print the main sealing material 14.

  Next, the bonding process 506 of the board | substrate 10 is implemented. The reading unit 62 reads the bonding condition of the substrate 10 from the image of the two-dimensional barcode 22 photographed by the sensor 61. That is, the conditions of the superposition machine (distance and pressure between substrates at the time of clearance, superposition pressure, provisional UV irradiation conditions, superposition mark conditions, etc.). The manufacturing condition setting unit 63 sets this condition in the superposition machine. The superposition machine bonds the two substrates 10 under the set conditions.

  Next, the dividing process 507 of the substrate 10 is performed. The reading unit 62 reads the division condition of the substrate 10 from the image of the two-dimensional barcode 22 photographed by the sensor 61. That is, scribing machine scribing conditions (head-to-substrate distance, head pressure, head (substrate) moving speed, number of lines / positions, substrate size conditions, etc.) and breaking machine breaking conditions (head push-in amount, head pressure, head ( Board) moving speed, number of lines / position, board size condition, etc.). The manufacturing condition setting unit 63 sets this condition for each of the scribing machine and the breaking machine. The superimposing machine divides the two substrates 10 by scribing and breaking under the set conditions.

  Next, a liquid crystal injection step 508 is performed. Since the substrate 10 is divided, the sensor 61 captures an image of the two-dimensional barcode 21. The reading unit 62 reads the two-dimensional barcode 21 and reads the liquid crystal injection conditions. That is, the liquid crystal injector conditions (degree of ultimate vacuum (evacuation time), liquid crystal type, dip time, air release conditions, etc.) are read out. The manufacturing condition setting unit 63 sets this condition for the liquid crystal injector. The liquid crystal injector injects the liquid crystal 13 into the gap between the two substrates 10 under the set conditions.

  Next, the sealing step 509 is performed. From the two-dimensional barcode 21 imaged by the sensor 61, the reading unit 62 reads the sealing condition. That is, the sealing machine conditions (head-substrate 10 distance, head (substrate 10) moving speed, end seal agent (ultraviolet effect resin) type, discharge pressure, end seal agent UV (ultraviolet) irradiation conditions, etc.) read out. The manufacturing condition setting unit 63 sets this condition in the sealing machine. The sealing machine seals the opening of the main sealant 14 with the end sealant under the set conditions.

  Next, a chamfer cleaning process 510 is performed. From the two-dimensional barcode 21 imaged by the sensor 61, the reading unit 62 reads the cleaning condition. The manufacturing condition setting unit 63 sets this condition for the washing machine. After the operator chamfers the corners of the cut surface of the substrate 10 with a file or the like, the sealing machine cleans the substrate under the set conditions to wash off glass dust and the like.

  Next, a polarizing plate attaching step 511 is performed. From the two-dimensional barcode 21 imaged by the sensor 61, the reading unit 62 reads the affixing conditions (polarizing plate type, angle, size, etc.) of the polarizing plate 16. The manufacturing condition setting unit 63 sets this condition in the polarizing plate applicator. The polarizing plate applicator selects the type of polarizing plate 16 under the set conditions, and pastes it at the set angle.

  Next, the polarizing plate printing step 512 is performed. From the two-dimensional barcode 21 imaged by the sensor 61, the reading unit 62 reads whether or not to perform printing on the polarizing plate 16, and if so, printing conditions (printing pattern, color, position, printing pressure, etc.). When printing is performed, the manufacturing condition setting unit 63 sets this condition in the printing press. The printing machine prints the set print pattern on the polarizing plate 16 under the set conditions.

  Next, a pin insertion step 513 is performed. From the two-dimensional barcode 21 imaged by the sensor 61, the reading unit 62 determines whether or not it is a type in which an electrode pin is inserted into the terminal portion of the transparent electrode film 11, and if so, the conditions (pin type, pitch, length). , Pressure, etc.). The manufacturing condition setting unit 63 sets this condition in the pin insertion machine. The pin insertion machine inserts a set type of pins under set conditions. Thereafter, the operator coats the pin insertion portion with resin.

  The liquid crystal cell is completed through the above steps. A backlight, an electric circuit, and the like are attached to the liquid crystal cell by a known method to complete a liquid crystal display device.

  In the manufacturing method of the present embodiment described above, exposure in at least one photolithography process of the manufacturing process is performed using an exposure machine that can freely change the exposure position based on a drawing pattern created in advance. Thus, the two-dimensional barcode pattern can be included in the pattern drawn on the substrate. Therefore, in at least one process performed after the photolithography process, the reading result is produced and managed by using a manufacturing apparatus having a function of reading a two-dimensional barcode pattern and a function of changing manufacturing conditions reflecting the reading result. Can be used as data.

  In addition, since the barcode can be read for each process (for each manufacturing device) and the manufacturing conditions can be set according to the contents, it is possible to eliminate the operator's setting error and to cause defects due to the operator's setting error. The effect of disappearing is obtained. In particular, this is effective in processes where there are many setting errors of conventional workers, such as a rubbing process 504 and a printing process 505.

  Moreover, since production data (manufacturing conditions) can be collected in real time for each process, the production data of the line can be visualized.

  Further, by reading the two-dimensional bar code 22 before loading the large board 10 into the manufacturing apparatus, it is possible to match the set conditions with the product to be manufactured. can get.

  The two-dimensional barcode 21 remains even after the liquid crystal cell is completed, and manufacturing conditions are written in the two-dimensional barcode 21, and a detailed identification number (lot number or the like) can be written as necessary. This completes traceability. The manufacturing conditions of a cell that has been found to be defective by inspection before shipment, inspection after reliability testing, or claims after shipment are read with a two-dimensional barcode, the cause of the defect is identified, and the result is determined in the future manufacturing conditions. Can be reflected.

In the above embodiment, the example of the transparent electrode film 11 is shown for the material constituting the two-dimensional barcode. However, other transparent films such as the transparent insulating film 20 (SiN, SiO _2, etc.) and a part of the alignment film 12 are used. Can be processed into the shape of the two-dimensional barcodes 21 and 22. In addition, when a metal film (Al, Mo, Cr, etc.), a semiconductor film (Si, etc.), a color filter film, a black matrix film, etc. are disposed, these can be processed into a two-dimensional barcode shape. It is.

  Also, the exposure apparatus is not limited to the above-described exposure machine, and a laser having a different wavelength or a mercury lamp may be used as a light source. The resist is not limited to the positive type, and may be a negative type.

  In the above-described embodiment, the example in which the two-dimensional barcodes 21 and 22 are respectively formed on the transparent electrode films 11 of the pair of substrates 10 arranged to face each other has been described. A configuration in which the two-dimensional barcodes 21 and 22 are formed only on the film 11 is also possible.

  The liquid crystal display device of the present invention can be used for all products using the liquid crystal display device. In particular, in-vehicle displays (car navigation, multi-information, cluster display, center console, etc.), aircraft displays, display devices for games, display units for mobile phones and DSCs (digital still cameras), audio devices, televisions, personal computers The present invention can be applied to a display portion of a display device.

Explanatory drawing which shows the cross-section of the liquid crystal cell of this Embodiment. FIG. 3 is a top view showing the shape of the transparent electrode film 11 and the shape of the two-dimensional barcode 21 of the liquid crystal cell of the present embodiment. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 3 is a top view showing the shapes of a transparent electrode film 11 and a two-dimensional barcode 22 of a plurality of liquid crystal cells formed on a large substrate 10 in the liquid crystal cell manufacturing method of the present embodiment. Explanatory drawing which shows the flow of a process in the manufacturing method of this Embodiment. The block diagram which shows the partial structure of the manufacturing line used for the manufacturing method of this Embodiment. (A) Explanatory drawing which shows the positional relationship of the sensor 61, the illumination light source 73, and the board | substrate 10 at the time of recognizing the two-dimensional barcode 22 in the manufacturing process of this Embodiment, (b) Recognizing the two-dimensional barcode 21 Explanatory drawing which shows the positional relationship of the sensor 61, the illumination light source 73, and the board | substrate 10 at the time of doing. In this Embodiment, the photograph of the screen which shows the image and the read character string which imaged the two-dimensional barcode 21 with the sensor. In this Embodiment, the photograph of the screen which shows the image and the read character string which imaged the two-dimensional barcode 21 with the sensor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Glass substrate, 11 ... ITO film, 12 ... Orientation film, 13 ... Liquid crystal, 14 ... Main seal material, 15 ... Conductive material, 16 ... Polarizing plate, 20 ... Insulating film, 21 ... Two-dimensional barcode, 22 ... Two Dimensional bar code, 23 ... display area, 61 ... sensor, 62 ... reading unit, 63 ... manufacturing condition setting unit, 64 ... printing machine, 65 ... printing machine, 66 ... transport device, 74 ... black plate.

Claims (10)

A method of manufacturing a liquid crystal display device,
A method for manufacturing a liquid crystal display device, comprising a patterning step of processing a transparent film formed on a substrate into a predetermined pattern for liquid crystal display and a two-dimensional barcode pattern. In the manufacturing method of the liquid crystal display device of Claim 1,
Information represented by the two-dimensional barcode formed in the patterning step includes manufacturing conditions,
In a step subsequent to the patterning step, the two-dimensional barcode is imaged, the manufacturing conditions are read from the obtained image, and the manufacturing steps are performed according to the read manufacturing conditions. . In the manufacturing method of the liquid crystal display device of Claim 1 or 2,
In a step after the patterning step, as a manufacturing line, one or more manufacturing apparatuses for performing the manufacturing step, a sensor that captures an image of the two-dimensional barcode, and the two-dimensional barcode represented from the image A method for manufacturing a liquid crystal display device, comprising: an apparatus including a reading unit that reads manufacturing conditions; and a setting unit that sets the read manufacturing conditions in the one or more manufacturing apparatuses. In the manufacturing method of the liquid crystal display device of any one of Claim 1 thru | or 3,
The method for manufacturing a liquid crystal display device, wherein the patterning step is a step of processing a transparent conductive film as the transparent film. In the manufacturing method of the liquid crystal display device of any one of Claim 2 thru | or 4,
When imaging the two-dimensional barcode, irradiate white light and reflect light from the transparent film constituting the two-dimensional barcode, and one dot of the two-dimensional barcode is 5 pixels or more of the imaging pixels. A method for manufacturing a liquid crystal display device, characterized in that imaging is performed at a magnification corresponding to. In the manufacturing method of the liquid crystal display device of Claim 5,
A method of manufacturing a liquid crystal display device, wherein a black plate is disposed on a surface of the substrate opposite to the illumination when imaging the two-dimensional barcode. In a liquid crystal display device having a pair of opposed transparent substrates, a transparent film mounted on at least one of the pair of transparent substrates, and a liquid crystal sandwiched between the pair of transparent substrates,
A part of the transparent film is processed into a two-dimensional barcode shape.   8. The liquid crystal display device according to claim 7, wherein the transparent film is a transparent electrode film disposed on an opposing surface of the pair of transparent substrates. 9.   9. The liquid crystal display device according to claim 7, wherein the information represented by the two-dimensional barcode includes manufacturing conditions set in a manufacturing process of the liquid crystal display device.   10. The liquid crystal display device according to claim 7, wherein the two-dimensional bar code is disposed outside a display area.