JP2006215899A - Pattern and pattern forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pattern and a pattern forming method capable of increasing an expressible information amount. <P>SOLUTION: This pattern 10 is formed on the rear face 2b of a glass substrate 2. A pattern formation area Z1 is virtually divided into respective cells each of 16 rows × 16 columns, a dot D is selectively formed to each the divided cell. The dot D is one of a first dot D1, a second dot D2, and a third dot D3 respectively having different dot diameters R1, R2, and R3. About one cell, four-value information is expressed according to whether the dot D is formed or not, and which dot D of the first to third dots D1-D3 is formed. Each the dot diameter R1-R3 is controlled by a frequency wherein a droplet is discharged from a discharge nozzle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pattern and a pattern forming method.

  Conventionally, electro-optical devices such as liquid crystal display devices and organic electroluminescence display devices (organic EL display devices) have a plurality of electro-optical elements formed on a substrate. In general, a unique identification code such as a production number or a two-dimensional code obtained by coding the production number is drawn on this type of substrate for the purpose of quality control, product management, or the like. This identification code is read and decoded by a dedicated code reader as a recognition means.

  As a method for drawing an identification code on this substrate, a method has been proposed in which a film with a metal foil faces a substrate (glass substrate), laser light is irradiated, the metal film is transferred to the substrate, and a mark is formed on the substrate. (For example, Patent Document 1). Further, a method has been proposed in which water containing an abrasive is sprayed onto a substrate or the like, and a number or the like is imprinted on the substrate (for example, Patent Document 2).

By the way, each of the above drawing methods has many drawing processes, and there is a problem that the apparatus is expensive and large. Therefore, there is an inkjet method that is inexpensive and small in size, and that can be drawn in a short time. In the ink jet method, a functional liquid (ink droplet) is discharged from a discharge nozzle onto a substrate using a droplet discharge device to form an identification code pattern such as a two-dimensional barcode.
Japanese Patent Laid-Open No. 11-77340 JP 2003-127537 A

  By the way, the amount of information handled increases with the automation of quality control, product management, maintenance history management, etc. in maintenance as well as the electro-optical device manufacturing process, and this identification code is expressed by the presence or absence of droplets. There is a possibility that the amount of information that can be expressed by the pattern (identification code) is insufficient. On the other hand, it is conceivable to increase the amount of dots representing the pattern. However, the area of the pattern increases as the amount of dots increases, and the electro-optical device cannot be reduced in size.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a pattern and a pattern forming method capable of increasing the amount of information that can be expressed.

  In order to solve the above problems, the pattern of the present invention is a pattern in which pattern forming elements formed by selectively discharging a liquid material from a droplet discharge device to a predetermined pattern formation region of a substrate are arranged and formed. The pattern forming elements having a plurality of sizes were arranged.

  According to the present invention, since the pattern forming elements having a plurality of types of sizes are arranged, information can be expressed not only according to the presence / absence of the pattern forming elements but also according to the type of size of the pattern forming elements. Therefore, the amount of information that can be expressed can be increased without increasing the area of the pattern formation region.

In the pattern of the present invention, the size of the pattern forming element is determined by the diameter of the pattern forming element.
According to this invention, since the size of the pattern forming element is determined by the diameter of the pattern forming element, the size of the pattern forming element can be easily read.

In the pattern of the present invention, the size of the pattern forming element is determined by the occupation rate of the pattern forming element per unit area of the pattern forming region.
According to the present invention, since the size of the pattern forming element is determined by the occupation rate of the pattern forming element per unit area of the pattern forming region, for example, when the liquid is ejected in a distorted shape and solidified. Even when the diameter of the pattern forming element is not constant, the size of the pattern forming element can be read accurately.

In the pattern of the present invention, the pattern is an identification code.
According to the present invention, since the pattern is the identification code, the pattern formation area for forming the identification code can be reduced.

In the pattern of the present invention, the substrate is a display substrate of a display device.
According to the present invention, since the substrate is a display substrate of the display device, the amount of information that can be expressed can be increased without increasing the area of the pattern formation region of the display substrate.

  The pattern forming method of the present invention is a pattern forming method in which pattern forming elements formed by selectively discharging a liquid material from a droplet discharge device to a predetermined pattern forming region of a substrate are arranged and formed. The size of the pattern forming element is varied by controlling the number of times.

  According to the present invention, the size of the pattern forming element is varied by controlling the number of ejections of the liquid material. Therefore, since the size of the pattern forming element can be varied by changing the number of ejections without changing the configuration of the droplet ejection apparatus, the amount of information that can be expressed easily can be increased.

  The pattern formation method of the present invention is a pattern formation method in which pattern formation elements formed by selectively discharging a liquid material from a droplet discharge device to a predetermined pattern formation region of a substrate are arranged and formed. By controlling the above, the size of the pattern forming element is varied.

  According to this invention, the size of the pattern forming element is varied by controlling the weight of the liquid. As a result, for example, the size of the pattern forming element can be varied by changing the weight of the discharged liquid material by controlling the timing of discharging the liquid material. Therefore, since the size of the liquid material can be changed without changing the number of ejections of the liquid material, the amount of information that can be expressed in a short time can be increased.

  The pattern formation method of the present invention is a pattern formation method in which pattern formation elements formed by selectively discharging a liquid material from a droplet discharge device to a predetermined pattern formation region of a substrate are arranged and formed on the substrate. The size of the pattern forming element is varied by controlling conditions for drying the liquid material.

  According to the present invention, since the size of the pattern forming element is varied by controlling the conditions for drying the liquid material discharged onto the substrate, the pattern can be formed without controlling the number of liquid discharge times and the discharge timing. The size of the forming element can be changed. Accordingly, since it is not necessary to prepare a plurality of types of bitmap data for controlling the number of times of discharging the liquid material and the timing of discharging, the amount of information that can be expressed easily can be increased.

Hereinafter, embodiments embodying the pattern of the present invention will be described with reference to FIGS.
First, a display module of a liquid crystal display device in which the pattern of the present invention is formed will be described. FIG. 1 is a front view of a display module of a liquid crystal display device, and FIG. 2 is a front view of a pattern formed on the back surface of the display module.

  In FIG. 1, a display module 1 includes a glass substrate 2 as a light-transmissive display substrate. A rectangular display unit 3 in which liquid crystal is sealed is formed at a substantially central position of the surface 2 a of the glass substrate 2, and a scanning line driving circuit 4 and a data line driving circuit 5 are formed outside the display unit 3. ing.

  A pattern 10 composed of a plurality of dots as an identification code of the display module 1 is formed at the right corner of the back surface 2 b of the glass substrate 2. As shown in FIG. 2, the pattern 10 is composed of dots D as a plurality of pattern forming elements formed in the pattern forming region Z1. In the present embodiment, the plurality of dots D are composed of the first dot D1, the second dot D2, and the third dot D3 having different diameters, details of which will be described later. The pattern 10 formed in the pattern formation region Z1 is a two-dimensional code in this embodiment, and is read by a two-dimensional code reader.

  The pattern formation area Z1 is a square area of 1 to 2 mm square, and is virtually divided into 16 rows × 16 columns of cells S as shown in FIG. Thus, dots D are selectively formed. The cell S in which the dot D is formed in the divided cell S is referred to as a black cell S1, and the cell S in which the dot D is not formed in the cell S is referred to as a white cell S0. That is, binary information can be expressed by whether or not the dot D is formed for one cell S. Then, dots D are selectively formed for each cell S of 16 rows × 16 columns, and a pattern 10 (two-dimensional code) for identifying the display module 1 constituted by each dot D is formed. . In FIG. 6, for convenience of explanation, it is assumed that the pattern 10 is composed of dots D having the same diameter.

  The dots D formed in the black cells S1 are formed in close contact with the glass substrate 2 in a hemispherical shape. In this embodiment, the dot D is formed by an ink jet method. More specifically, the dots D cause functional liquid droplets 31 (see FIG. 9) containing manganese fine particles to be ejected from the ejection nozzles 28 of the droplet ejection apparatus 20 described later as liquids to the cells S (black cells S1). Next, the droplet 31 that has landed on the black cell S1 is dried and sintered, and manganese fine particles are bonded to each other and cured, thereby forming a hemispherical dot D made of manganese adhered to the glass substrate 2. The

  In the present embodiment, as shown in FIG. 2, the plurality of dots D have a first dot D1, a second dot D2, and a third dot D3 each having a different dot diameter (hereinafter referred to as a dot diameter R) R. Is one of the dots. More specifically, the first dot D1 has the largest dot diameter R1 and is 120 μm. The second dot D2 has the next largest dot diameter R2 and is 70 μm. The third dot D3 has the smallest dot diameter R3 and is 50 μm. The two-dimensional code reader is designed in advance so as to be able to read that the dot diameter R1 is the first dot D1, the dot diameter R2 is the second dot D2, and the dot diameter R3 is the third dot D3. . These first to third dots D1 to D3 express different information according to their dot diameters R1 to R3. That is, in the present embodiment, for one cell S, not only binary information is represented by whether or not the dot D is formed, but when the dot D is formed, the dot D is first to first. Four-value information can be expressed depending on which of the three dots D1 to D3.

Here, FIGS. 3 to 5 are patterns in which white cells S0 and black cells S1 are formed in the same arrangement, but FIG. 3 is a pattern 11 formed by only the first dots D1. FIG. 4 shows a pattern 12 formed only by the second dots D2, and FIG. 5 shows a pattern 13 formed only by the third dots D3. The patterns 11 to 13 are different from each other because the white cells S0 and the black cells S1 are formed in the same arrangement and formed from the first to third dots D1 to D3 having different dot diameters R1 to R3. Expresses information. That is, in this embodiment, information can be expressed not only by the arrangement of the white cells S0 and the black cells S1, but also by whether the dots D formed as the black cells S1 are the first to third dots D1 to D3. . Since the dots D formed on the leftmost and lower sides of the patterns 11 to 13 are the dots D for determining the orientation of the patterns 11 to 13, in the present embodiment, reading is performed by a two-dimensional code reader. For convenience, the first dot D1 is used alone. In addition, the dots D formed on the uppermost and right sides of the patterns 11 to 13 are dots for indicating an effective range among the dots D formed as the patterns 11 to 13, and thus are determined by a two-dimensional code reader. For the convenience of reading, the first dots D1 are formed in dotted lines.

Next, the droplet discharge device 20 used for forming the pattern 10 on the back surface 2b of the glass substrate 2 will be described.
As shown in FIGS. 7 and 8, the droplet discharge device 20 includes a support base 21, and the support base 21 is provided with a transport base 22. The transport table 22 is reciprocated along the Y arrow direction and the anti-Y arrow direction by a Y-axis drive mechanism (not shown) with respect to the support table 21.

  A glass substrate 2 is placed on the transport table 22 with its back surface 2b facing upward, and the glass substrate 2 is transported in the Y arrow direction and the anti-Y arrow direction. And the glass substrate 2 conveyed by the conveyance stand 22 discharges the droplet 31 (refer FIG. 9) for forming the pattern 10 in the pattern formation area Z1 (refer FIG. 2) of the back surface 2b. ing.

  A gate-shaped support frame 23 is erected on the support base 21 so as to straddle the transport base 22 that moves in the Y arrow direction (counter-Y arrow direction). The support frame 23 is constructed on the support base 21 along the X arrow direction. The support frame 23 is provided with a guide rail 24 extending in the X arrow direction.

  A carriage 25 is slidably provided on the guide rail 24. The carriage 25 can be reciprocated along the guide rail 24 by an X-axis drive mechanism. The carriage 25 is integrally provided with a droplet discharge head 26. The droplet discharge head 26 is provided with a nozzle plate 27 on its lower surface, and 16 discharge nozzles 28 for forming the pattern 10 are formed in the nozzle plate 27 in a row in the direction of the arrow X at equal intervals. Yes. FIG. 9 shows only one discharge nozzle 28 for convenience of explanation.

  Further, the droplet discharge head 26 is provided with a piezoelectric element 42 (see FIG. 10) corresponding to the discharge nozzle 28, and the voltage applied to the piezoelectric element 42 is controlled, so that the inside of the droplet discharge head 26. Each functional liquid temporarily stored in the liquid is discharged as a droplet 31. That is, the droplet discharge head 26 stores a functional liquid containing manganese fine particles. As shown in FIG. 9, functional liquid droplets 31 containing manganese fine particles are discharged from the discharge nozzles 28 of the nozzle row.

Next, the electrical configuration of the droplet discharge device 20 configured as described above will be described with reference to FIG.
In FIG. 10, the control unit 40 includes a CPU, a RAM, a ROM, and the like, and moves the transport base 22 according to a control program and an identification code (two-dimensional code) creation program stored in the ROM and the like to transport the glass substrate 2. The droplet discharge processing operation is performed by driving the processing operation and the droplet discharge head 26 (piezoelectric element 42). In addition, bitmap data BMD for creating a two-dimensional code on the glass substrate 2 is stored in advance in the ROM. In this bitmap data BMD, each identification data composed of a character string such as a manufacturing number and a lot number, a numeric string, etc. is converted into a two-dimensional code (pattern 10) for each identification data by a known method, and further bitmapped. It is data. Here, the bit map formation means which droplet 31 for forming the dot D is used for which cell S (black cell S1) in the pattern formation region Z1 composed of cells S of 16 rows × 16 columns. It is to determine at which timing to discharge.

  The bitmap data BMD also stores data for forming dots having dot diameters R1 to R3 corresponding to the first to third dots D1 to D3, respectively. That is, for example, data such that the droplet 31 is ejected three times in succession corresponding to the first dot D1 having the dot diameter R1, and the droplet 31 is ejected twice corresponding to the second dot D2 having the dot diameter R2. Data that continuously discharges is stored. Data that discharges the droplet 31 once corresponding to the third dot D3 having the dot diameter R3 is stored. In the present embodiment, the number of ejections of the droplets 31 corresponding to the dot diameters R1 to R3 is obtained by performing a test or the like in advance.

  The control unit 40 is connected to the nozzle drive circuit 41 and outputs a nozzle drive signal to the nozzle drive circuit 41. Based on the nozzle drive signal from the control unit 40, the nozzle drive circuit 41 energizes and drives the piezoelectric element 42 corresponding to the nozzle drive signal among the piezoelectric elements 42 provided in the droplet discharge head 26. Then, the droplet 31 is ejected from the ejection nozzle 28 corresponding to the piezoelectric element 42 toward the glass substrate 2.

  The controller 40 is connected to an X-axis motor drive circuit 43 and outputs an X-axis motor drive control signal to the X-axis motor drive circuit 43. In response to an X-axis motor drive control signal from the control unit 40, the X-axis motor drive circuit 43 rotates the X-axis motor MX in the X-axis drive mechanism that reciprocates the carriage 25 in the normal direction or the reverse direction. ing. For example, when the X-axis motor MX is rotated forward, the carriage 25 is moved in the X arrow direction, and when it is rotated reversely, the carriage 25 is moved in the opposite X arrow direction.

  The controller 40 is connected to a Y-axis motor drive circuit 44 and outputs a Y-axis motor drive control signal to the Y-axis motor drive circuit 44. In response to the Y-axis motor drive control signal from the control unit 40, the Y-axis motor drive circuit 44 rotates the Y-axis motor MY in the Y-axis drive mechanism that reciprocates the transport table 22 in the normal direction or the reverse direction. It has become. For example, when the Y-axis motor MY is rotated forward, the transport base 22 moves in the Y arrow direction, and when it is reversely rotated, the transport base 22 moves in the counter Y arrow direction.

  Further, a substrate detection device 45 is connected to the control unit 40. The substrate detection device 45 is used when the edge of the glass substrate 2 is detected and the position of the glass substrate 2 passing immediately below the droplet discharge head 26 is calculated by the control unit 40.

  The control unit 40 is connected to an X-axis motor rotation detector 46 and receives a detection signal from the X-axis motor rotation detector 46. Based on this detection signal, the control unit 40 detects the rotation direction and rotation amount of the X-axis motor MX, and calculates the movement amount and movement direction of the droplet discharge head 26 (carriage 25) in the X arrow direction. It is like that. The control unit 40 is connected to a Y-axis motor rotation detector 47 and receives a detection signal from the Y-axis motor rotation detector 47. The control unit 40 detects the rotation direction and the rotation amount of the Y-axis motor MY based on the detection signal from the Y-axis motor rotation detector 47, and the movement direction of the glass substrate 2 in the Y arrow direction relative to the droplet discharge head 26. And the amount of movement is calculated.

  An input device 48 is connected to the control unit 40. The input device 48 has operation switches such as a start switch and a stop switch, and outputs an operation signal generated by operating each switch to the control unit 40.

Next, a method for forming the pattern 10 on the back surface 2b of the glass substrate 2 using the droplet discharge device 20 will be described.
First, as shown in FIG.7 and FIG.8, the glass substrate 2 is arrange | positioned and fixed to the conveyance stand 22 so that the back surface 2b may become an upper side. At this time, the side opposite to the Y arrow of the glass substrate 2 is disposed closer to the Y arrow than the support frame 23. In addition, the carriage 25 (droplet discharge head 26) is located at a position where the pattern 10 formation position (pattern formation region Z1) passes immediately below the carriage 25 when the glass substrate 2 moves in the direction of the anti-Y arrow. It is set.

  From this state, the control unit 40 drives and controls the Y-axis motor MY to transport the glass substrate 2 in the anti-Y arrow direction via the transport base 22. Eventually, when the substrate detection device 45 detects the edge of the glass substrate 2 on the side opposite to the Y arrow, the control unit 40 reads the bitmap data BMD for the glass substrate 2 stored in the ROM according to the code creation program. Then, the bitmap data BMD is converted into droplet discharge data for driving the discharge nozzle 28 of the droplet discharge head 26, and the discharge timing is awaited.

  The control unit 40 calculates whether or not the glass substrate 2 has been transported to the position where the pattern 10 is formed based on the detection signal from the Y-axis motor rotation detector 47. When the glass substrate 2 is transported to the position where the pattern 10 is formed, the control unit 40 moves the glass substrate 2 in the anti-Y arrow direction, and creates a nozzle based on the created droplet discharge data and its discharge timing. A nozzle drive signal is output to the drive circuit 41.

  More specifically, the piezoelectric elements 42 corresponding to the ejection nozzles 28 of the droplet ejection head 26 are sequentially driven based on droplet ejection data and ejection timing. That is, the piezoelectric element 42 is driven and controlled so that the droplets 31 are ejected at the same ejection timing, respectively, by a predetermined number of times corresponding to the first to third dots D1 to D3. At this time, droplets 31 for forming the first to third dots D1 to D3 having the dot diameters R1 to R3 constituting the pattern 10 are discharged onto the glass substrate 2.

  When the droplet 31 for forming the dot D (first to third dots D1 to D3) is ejected in the pattern formation region Z1, the droplet ejection operation for forming the pattern 10 by the droplet ejection device 20 is performed. Exit. Then, the control unit 40 controls the Y-axis motor MY to retract the glass substrate 2 from the position below the droplet discharge head 26.

  The glass substrate 2 after the droplet discharge process for forming and creating the pattern 10 is solidified. That is, the glass substrate 2 moves to a heating process. As a result, the dispersion medium of the droplets 31 for forming the first to third dots D1 to D3 discharged to the glass substrate 2 evaporates, and the fine particles contained in the droplets 31 are fixed to the glass substrate 2. The The fine particles fixed to the glass substrate 2 are sintered and joined to each other to be in a cured state. Then, hemispherical first to third dots D1 to D3 are formed on the glass substrate 2.

Next, the effect of this embodiment will be described below.
(1) In the present embodiment, the first dot D1, the second dot D2, and the third dot D3 having different dot diameters R1, R2, and R3 are formed in the pattern formation region Z1 where the pattern 10 is formed. As a result, even in a pattern in which the white cell S0 and the black cell S1 are arranged in the same arrangement, different information can be expressed by changing the dot diameter R of the black cell S1. Therefore, for example, a larger amount of information can be expressed in a smaller area than when increasing the amount of information that can be expressed by the pattern 10 by enlarging the pattern formation region Z1 of the pattern 10 and increasing the dots D. it can.

  (2) In this embodiment, since the first dot D1, the second dot D2, and the third dot D3 are formed by the droplet discharge device 20, the pattern 10 that can express a large amount of information easily and in a short time is formed. Can do.

  (3) In the present embodiment, the first dot D1, the second dot D2, and the third dot D3 are formed by ejecting the droplet 31 from the droplet ejection device 20 a predetermined number of times. As a result, since the first to third dots D1 to D3 having different dot diameters R1 to R3 can be formed only by controlling the number of ejections without changing the driving timing of the piezoelectric element 42, a large amount of information can be expressed easily. Pattern 10 can be formed.

  (4) In the above embodiment, the pattern 10 is formed using the droplet discharge device 20. For this reason, the pattern 10 which can express a lot of information can be created without deforming the glass substrate 2 like the marking by laser irradiation, polishing or the like. Therefore, the amount of information that can be expressed by the pattern 10 can be increased without hindering the design freedom of the display module 1.

  (5) According to this embodiment, since the pattern 10 is formed by the droplet discharge device 20, for example, a special or large-sized facility is used as compared with the case where the pattern 10 is formed by laser irradiation or a water jet method. The pattern 10 can be formed on the glass substrate 2 with a relatively simple apparatus without the need to provide the pattern.

  (6) In this embodiment, the 1st-3rd dots D1-D3 were formed with manganese with low electroconductivity. Therefore, even if the first to third dots D1 to D3 are rubbed and peeled off and attached to another device or the like, it can be prevented from causing a failure of the device. Further, even if a small amount of manganese is mixed in the insulating film formed on the glass substrate 2 in the manufacturing process, the insulating property of the insulating film can be maintained. Further, since the fine particles contained in the droplets 31 are manganese particles having low conductivity, even if the mist of the droplets 31 adheres to an electronic device or the like when the droplets 31 are ejected, the device malfunctions or the like. It can be prevented from causing.

In addition, you may change the said embodiment as follows.
In the above embodiment, the dot diameter R is controlled by the number of ejections of the droplets 31. By adjusting the waveform of the nozzle drive signal output from the controller 40 to the nozzle drive circuit 41, the timing for driving the piezoelectric element 42 is adjusted, and the weight of the droplet 31 discharged from the discharge nozzle 28 is adjusted. You may control dot diameter R1-R3 by controlling. Further, the dot diameters R1 to R3 may be controlled by controlling the weight of the droplet 31 and the number of ejections.

  In the above embodiment, the dot diameters R <b> 1 to R <b> 3 are controlled by the number of ejections of the droplet 31. Alternatively, the dot diameters R <b> 1 to R <b> 3 may be controlled by adjusting the conditions for discharging the droplets 31 and drying the hemispherical droplets 31 attached to the glass substrate 2. That is, by drying the liquid droplet 31 before the liquid droplet 31 spreads on the glass substrate 2, the dispersion medium evaporates more and the dot diameter R becomes smaller. On the other hand, when the droplets 31 are wet spread on the glass substrate 2 and dried, the evaporation amount of the dispersion medium is reduced and the dot diameter R is increased.

  In the above embodiment, the dots formed on the leftmost and lower sides of the pattern 10 are the first dots D1, but dots with other dot diameters R may be used. Further, although the dots ejected in dotted lines on the uppermost side and the right side of the pattern 10 are the first dots D1, dots having other dot diameters R may be used.

In the above embodiment, the dots formed on the leftmost and lower sides of the pattern 10 and the dots formed on the uppermost and right sides of the pattern 10 in dotted lines are only the first dots D1. A plurality of types of dots having a dot diameter R may be mixed and ejected, as long as they can be read by a two-dimensional code reader.

  In the above embodiment, the dots formed on the leftmost and lower sides of the pattern 10 are dots for determining the orientation of the pattern 10 and are formed in dotted lines on the uppermost and right sides of the pattern 10. However, the present invention is not limited to this. However, the present invention is not limited to this. As long as it can be read by a two-dimensional code reader, the position where the dot indicating the effective range of the dot D and the direction of the dot D is formed is arbitrary. Furthermore, as long as it can be read by a two-dimensional code reader, it is not necessary to determine the orientation and form a dot indicating the effective range of the dot D.

  In the above embodiment, different information is given according to the size of the dot diameter R. However, this may be given different information according to the occupancy rate of the dots D per area of the cell S. Thereby, even when the dots D are ejected in a distorted shape and solidified, they can be read by the two-dimensional code reader.

  In the above embodiment, the dot diameter R has three types corresponding to the first dot D1, the second dot D2, and the third dot D3, but is not limited thereto, and is two types or four or more types. Also good.

  In the above embodiment, the dot diameter R1 is 120 μm, the dot diameter R2 is 70 μm, and the dot diameter R3 is 50 μm. However, the present invention is not limited to this, as long as it can be read by a two-dimensional code reader.

In the above embodiment, the dots D are made of manganese, but may be made of other metals or pigments as long as they can be read by a two-dimensional code reader.
In the above embodiment, the pattern 10 is formed on the glass substrate 2, but may be formed on a silicon wafer, a resin film, a metal plate, or the like.

  In the above embodiment, the present invention is embodied in the display module 1 of the liquid crystal display device. For example, a display module of an organic electroluminescence display device may be used, or a field effect device (including a planar electron-emitting device and using light emission of a fluorescent material by electrons emitted from the device) ( A display module including an FED, an SED, or the like may be used. Further, the glass substrate 2 or the like on which the pattern 10 is formed may be used not only for these display devices but also for other electronic devices.

The front view of the display module of the liquid crystal display device of this embodiment. Similarly, the front view of the pattern formed in the back surface of a display module. Similarly, the front view of the pattern formed only by the 1st dot. Similarly, the front view of the pattern formed only by the 2nd dot. Similarly, the front view of the pattern formed only by the 3rd dot. Similarly, explanatory drawing for demonstrating the structure of a pattern. Similarly, the principal part front view of a droplet discharge apparatus. Similarly, the top view of a droplet discharge device. Similarly, the enlarged view of a droplet discharge head. Similarly, the block circuit diagram for demonstrating the electrical structure of a droplet discharge apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Display module, 2 ... Glass substrate, 10, 11, 12, 13 ... Pattern, 20 ... Droplet discharge apparatus, 26 ... Droplet discharge head, 28 ... Discharge nozzle, 31 ... Droplet, 40 ... Control part, 42 ... Piezoelectric element, Z1 ... Pattern formation region, S ... Cell, S0 ... White cell, S1 ... Black cell, D ... Dot, D1 ... First dot, D2 ... Second dot, D3 ... Third dot, R, R1, R2, R3 ... dot diameter.

Claims (8)

In a pattern in which pattern forming elements formed by selectively discharging a liquid material from a droplet discharge device to a predetermined pattern formation region of a substrate are arranged and formed,
A pattern in which the pattern forming elements having a plurality of types of sizes are arranged. The pattern according to claim 1,
The pattern is characterized in that the size of the pattern forming element is determined by the diameter of the pattern forming element. The pattern according to claim 1,
The pattern is characterized in that the size of the pattern forming element is determined by an occupation rate of the pattern forming element per unit area of the pattern forming region. The pattern according to any one of claims 1 to 3,
The pattern is an identification code. The pattern according to any one of claims 1 to 4,
The pattern is a display substrate of a display device. In a pattern forming method for arraying pattern forming elements formed by selectively discharging a liquid material from a droplet discharge device to a predetermined pattern forming region of a substrate,
A pattern forming method, wherein the size of the pattern forming element is varied by controlling the number of times the liquid material is discharged. In a pattern forming method for arraying pattern forming elements formed by selectively discharging a liquid material from a droplet discharge device to a predetermined pattern forming region of a substrate,
A pattern forming method, wherein the size of the pattern forming element is varied by controlling the weight of the liquid. In a pattern forming method for arraying pattern forming elements formed by selectively discharging a liquid material from a droplet discharge device to a predetermined pattern forming region of a substrate,
A pattern forming method, wherein the size of the pattern forming element is varied by controlling conditions for drying the liquid material discharged onto the substrate.

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