Patent Publication Number: US-2023134959-A1

Title: Fringe information measuring apparatus and substrate treating system including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from Korean Patent Application No. 10-2021-0147297 filed on Oct. 29, 2021 in the Korean Intellectual Property Office, and all the benefits accruing therefrom under 35 U.S.C. 119, the contents of which in its entirety are herein incorporated by reference. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a fringe information measuring apparatus and a substrate treating system including the same, and more particularly, to a fringe information measuring apparatus that can be applied to facilities for jetting droplets onto a substrate and a substrate treating system including the same. 
     2. Description of the Related Art 
     Whenever a printing process (e.g., RGB patterning) is performed on a transparent substrate to manufacture display devices such as an LCD panel, a PDP panel and an LED panel, printing equipment equipped with an inkjet head unit may be used. 
     SUMMARY 
     A phase doppler particle analyzer (PDPA) device is an instrument that measures the volume and speed of droplets jetted from a nozzle of an inkjet head unit using a laser. Such a PDPA device can measure the volume and speed of droplets when they pass through a fringe region formed by using a laser. 
     However, since both the size of the droplets and the size of the fringe region are very small, it is difficult to align the position of the nozzle so that the droplets pass through the fringe region. 
     Aspects of the present disclosure provide a fringe information measuring apparatus that measures information on a fringe region using a temperature sensor array and a substrate treating system including the same. 
     The technical aspects of the present disclosure are not restricted to those set forth herein, and other unmentioned technical aspects will be clearly understood by one of ordinary skill in the art to which the present disclosure pertains by referencing the detailed description of the present disclosure given below. 
     Technical Solution 
     According to an aspect of the present disclosure, there is provided a fringe information measuring apparatus, comprising: a laser sensor configured to output a first laser light and a second laser light to intersect each other; a thermal sensor array configured to pass through a fringe region formed by the intersection of the first laser light and the second laser light; and a control module configured to measure a position of the fringe region based on information obtained when the thermal sensor array passes through the fringe region. 
     The thermal sensor array may include a plurality of thermal sensors disposed at regular intervals. 
     The control module may measure the position of the fringe region based on position information and temperature information of each thermal sensor. 
     The control module may measure the position of the fringe region based on the position information of the thermal sensor that measures a temperature higher than that of other thermal sensors. 
     The fringe information measuring apparatus further comprises a first camera sensor configured to photograph the thermal sensor array, and the control module may recognize the position information of each of the thermal sensors included in the thermal sensor array based on information obtained by photographing the thermal sensor array. 
     The control module may recognize the position information of each of the thermal sensors in real time whenever the thermal sensor array moves. 
     The control module may measure the position of the fringe region by moving the thermal sensor array, or measure the position of the fringe region by moving the fringe region. 
     The control module may further measure the size of the fringe region and the shape of the fringe region based on the information obtained when passing through the fringe region. 
     When measuring the size of the fringe region, the control module may estimate the size of the fringe region based on the size of thermal sensors that measure a temperature higher than that of other thermal sensors. 
     When measuring the shape of the fringe region, the control module may estimate the shape of the fringe region based on the shape of thermal sensors that measure a temperature higher than that of other thermal sensors. 
     The control module may determine whether or not the laser sensor is abnormal based on a change in a measured value of the thermal sensor array. 
     According to another aspect of the present disclosure, there is provided a substrate treating system, comprising: a process treating unit configured to support a substrate while treating the substrate; an inkjet head unit provided with a plurality of nozzles and configured to jet a substrate treatment solution onto the substrate using each of the nozzles; a gantry unit provided with the inkjet head unit and configured to move the inkjet head unit; a control unit configured to align positions of the plurality of nozzles; and a fringe information measuring apparatus configured to form a fringe region through which the substrate treatment solution passes and measure a position of the fringe region. The control unit aligns the positions of the plurality of nozzles based on the position of the fringe region. 
     The substrate treating system further comprises a second camera sensor configured to measure the positions of the plurality of nozzles, and the control unit aligns the positions of the plurality of nozzles based on the position of the fringe region when obtaining a measured value of the second camera sensor. 
     According to an aspect of the present disclosure, there is also provided a substrate treating system, comprising: a process treating unit configured to support a substrate while treating the substrate; an inkjet head unit provided with a plurality of nozzles and configured to jet a substrate treatment solution onto the substrate using each of the nozzles; a gantry unit provided with the inkjet head unit and configured to move the inkjet head unit; a control unit configured to align positions of the plurality of nozzles; and a fringe information measuring apparatus configured to form a fringe region through which the substrate treatment solution passes and measure a position of the fringe region. The fringe information measuring apparatus comprises: a laser sensor configured to output a first laser light and a second laser light to intersect each other; a thermal sensor array provided with a plurality of thermal sensors disposed at regular intervals and configured to pass through the fringe region formed by the intersection of the first laser light and the second laser light; and a control module configured to measure a position of the fringe region based on information obtained when the thermal sensor array passes through the fringe region. The control module measures the position of the fringe region based on position information and temperature information of each thermal sensor, and the control unit aligns the positions of the plurality of nozzles based on the position of the fringe region. 
     Specific details of other embodiments are included in the detailed description and the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects and features of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which: 
         FIG.  1    is a conceptual diagram schematically illustrating a structure of a substrate treating system according to one embodiment of the present disclosure; 
         FIG.  2    is a first exemplary diagram schematically illustrating an internal configuration of a fringe information measuring apparatus constituting a substrate treating system according to one embodiment of the present disclosure; 
         FIG.  3    is an exemplary diagram explaining a fringe region formed according to one embodiment of the present disclosure; 
         FIG.  4    is an exemplary diagram of a thermal sensor array included in the fringe information measuring apparatus according to one embodiment of the present disclosure; 
         FIG.  5    is a first exemplary diagram explaining a method of measuring a position of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure; 
         FIG.  6    is a second exemplary diagram explaining the method of measuring the position of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure; 
         FIG.  7    is a second exemplary diagram schematically illustrating an internal configuration of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure; 
         FIG.  8    is a first exemplary diagram explaining a method of measuring the size of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure; 
         FIG.  9    is a first exemplary diagram explaining a method of measuring the shape of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure; and 
         FIG.  10    is a second exemplary diagram explaining the method of measuring the shape of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENT 
     Hereinafter, embodiments of the present disclosure will be described with reference to the attached drawings. The same or similar elements are assigned the same reference numerals irrespective of their reference numerals, and a redundant description thereof is omitted. 
     The present disclosure relates to a fringe information measuring apparatus that measures information on a fringe region (e.g., a position of the fringe region) using a temperature sensor array, and a substrate treating system including the same. According to the present disclosure, the position of a nozzle can be easily aligned so that droplets in micrometers pass through the fringe region in micrometers. Hereinafter, the present disclosure will be described in detail with reference to drawings. 
       FIG.  1    is a conceptual diagram schematically illustrating a structure of a substrate treating system according to one embodiment of the present disclosure. 
     In the present disclosure, the fringe information measuring apparatus may measure information on the fringe region to measure the position of a nozzle installed in an inkjet head unit  140 . To this end, the fringe information measuring apparatus may be provided in an inkjet facility configured to jet ink onto a substrate. 
     A substrate treating system  100  is meant to treat a substrate G (e.g., a glass substrate) used to manufacture a display device. This substrate treating system  100  can be implemented with the inkjet facility that jets a substrate treatment solution onto the substrate G using the inkjet head unit  140 . Specifically, it can be implemented with a circulatory inkjet facility to prevent nozzles from being blocked by the substrate treatment solution. The substrate treating system  100  may be provided as, for instance, a quantum dot (QD) color filter (CF) inkjet facility. 
     According to  FIG.  1   , the substrate treating system  100  may include a process treating unit  110 , a maintenance unit  120 , a gantry unit  130 , an inkjet head unit  140 , a substrate treatment solution supply unit  150 , a control unit  160 , and a fringe information measuring apparatus  200 . 
     The process treating unit  110  supports the substrate G while a PT operation is performed on the substrate G. The process treating unit  110  may support the substrate G using a non-contact way. The process treating unit  110  may support the substrate G by levitating the substrate G in the air using, for instance, air. However, the present embodiment is not limited thereto. The process treating unit  110  may support the substrate G using a contact way. The process treating unit  110  may support the substrate G using, for example, a support member having a settling surface formed on an upper part thereof. 
     Meanwhile, the PT operation refers to printing the substrate G using the substrate treatment solution, and the substrate treatment solution refers to a medical fluid used to print the substrate G. The substrate treatment solution may be, for example, quantum dot (QD) ink including ultrafine semiconductor particles. 
     The process treating unit  110  may include a first stage  111  and an air hole  112  when supporting the substrate G using air. 
     The first stage  111  serves as a base and is provided so that the substrate G may be settled on an upper part thereof. The air holes  112  may be formed by penetrating an upper surface of the first stage  111  and may be formed in a plural form in a PT zone on the first stage  111 . 
     The air hole  112  may inject air in an upper direction  30  (i.e., a third direction) of the first stage  111 . Through this, the air hole  112  may levitate the substrate G settled on the first stage  111  into the air. 
     Meanwhile, although not illustrated in  FIG.  1   , the process treating unit  110  may further include a gripper. The gripper is meant to prevent the substrate G from deviating from the first stage  111  when the substrate G moves along a longitudinal direction  10  (i.e., a first direction) of the first stage  111 . The gripper may prevent the substrate G from deviating from the first stage  111  by gripping the substrate G and may slide along a guide rail (not shown) in a state of gripping the substrate G when the substrate G moves. 
     The maintenance unit  120  is meant to measure a position (i.e., a hitting point) where the substrate treatment solution is jetted on the substrate G and whether or not the substrate treatment solution is jetted. The maintenance unit  120  may measure the position of jetting the substrate treatment solution and whether or not the substrate treatment solution is jetted with regard to each of a plurality of nozzles included in the inkjet head unit  140 , and allow the obtained measurement results to be supplied to the control unit  160 . 
     The maintenance unit  120  may include, for example, a second stage  121 , a third guide rail  122 , a first plate  123 , a calibration board  124 , and a vision module  125 . 
     Similarly to the first stage  111 , the second stage  121  may serve as a base and be disposed in parallel with the first stage  111 . The second stage  121  may be provided with the same size as the first stage  111 ; however, it can be provided with a size smaller or larger than that of the first stage  111 . The second stage  121  may include an MT zone formed on an upper part thereof. 
     The third guide rail  122  guides a movement path of the first plate  123 . The third guide rail  122  may be provided on the second stage  121  as at least one line along the longitudinal direction  10  (i.e., the first direction) of the second stage  121 . The third guide rail  122  may be implemented with, for example, a linear motor (LM) guide system. 
     Meanwhile, although not illustrated in  FIG.  1   , the maintenance unit  120  may further include a fourth guide rail. Similarly to the third guide rail  122 , the fourth guide rail may guide the movement path of the first plate  123  and be provided on the second stage  121  as at least one line along a width direction  20  (i.e., a second direction) of the second stage  121 . Similarly to the third guide rail  122 , the fourth guide rail may also be implemented with the LM guide system. 
     The first plate  123  moves on the second stage  121  along the third guide rail  122  and/or the fourth guide rail. The first plate  123  may move alongside the substrate G along the third guide rail  122  and may approach the substrate G or move away from the substrate G along the fourth guide rail. 
     The calibration board  124  is meant to measure a position of jetting the substrate treatment solution on the substrate G. The calibration board  124  may include an alignment mark and a graduated ruler and be installed on the first plate  123 . The calibration board  124  may be provided along the longitudinal direction  10  (i.e., the first direction) of the first plate  123 . 
     The vision module  125  is meant to acquire image information on the substrate G to measure the position of jetting the substrate treatment solution and whether or not the substrate treatment solution is jetted. The vision module  125  may include an area scan camera and a line scan camera and obtain the image information on the substrate G in real time. Meanwhile, the vision module  125  may obtain and provide information on the calibration board  124  as well as information on the substrate G on which the substrate treatment solution is jetted. 
     The vision module  125  may be provided on a side part or a lower part of the gantry unit  130  to photograph the substrate G. The vision module  125  may be installed, for example, in a form where it is attached to the side surface of the inkjet head unit  140 . However, the present embodiment is not limited thereto. The vision module  125  may be provided on the first plate  123 . Meanwhile, a plurality of vision modules  125  may be provided in the substrate treating system  100 , and may be fixedly installed or movably installed therein. 
     The gantry unit  130  supports the inkjet head unit  140 . The gantry unit  130  may be provided on upper parts of the first stage  111  and the second stage  121  so that the inkjet head unit  140  may jet the substrate treatment solution onto the substrate G. 
     The gantry unit  130  may be provided on the first stage  111  and the second stage  121  by considering the width direction  20  (i.e., the second direction) of the first stage  111  and the second stage  121  as the longitudinal direction. The gantry unit  130  may move along the first guide rail  170   a  and the second guide rail  170   b  in the longitudinal direction  10  (i.e., the first direction) of the first stage  111  and the second stage  121 . Meanwhile, the first guide rail  170   a  and the second guide rail  170   b  may be provided outside the first stage  111  and the second stage  121  along the longitudinal direction  10  (i.e., the first direction) of the first stage  111  and the second stage  121 . 
     Meanwhile, although not illustrated in  FIG.  1   , the substrate treating system  100  may further include a gantry movement unit. The gantry movement unit moves the gantry unit  130  along the first guide rail  170   a  and the second guide rail  170   b . The gantry movement unit may be installed inside the gantry unit  130  and may include a first movement module (not shown) and a second movement module (not shown). The first movement module and the second movement module may be provided in both ends of the gantry unit  130  and may slide and move the gantry unit  130  along the first guide rail  170   a  and the second guide rail  170   b.    
     The inkjet head unit  140  is meant to jet the substrate treatment solution in the form of droplets on the substrate G. The inkjet head unit  140  may be provided on the side part or the lower part of the gantry unit  130 . 
     At least one inkjet head unit  140  may be installed in the gantry unit  130 . When a plurality of inkjet head units  140  are installed in the gantry unit  130 , the plurality of inkjet head units  140  may be arranged in a row along the longitudinal direction  20  (i.e., the second direction) of the gantry unit  130 . 
     The inkjet head unit  140  may move along the longitudinal direction  20  (i.e., the second direction) of the gantry unit  130  to be disposed at a desired point on the substrate G. However, the present embodiment is not limited thereto. The inkjet head unit  140  may move along a height direction  30  (i.e., the third direction) of the gantry unit  130  and can rotate in a clockwise or counterclockwise direction. 
     Meanwhile, the inkjet head unit  140  may be fixed to the gantry unit  130 . In that case, the gantry unit  130  may be movably provided. 
     Meanwhile, although not illustrated in  FIG.  1   , the substrate treating system  100  may further include an inkjet head movement unit. The inkjet head movement unit is meant to linearly move or rotate the inkjet head unit  140 . When the substrate treating system  100  includes the plurality of inkjet head units  140 , several inkjet head movement units may be provided in the substrate treating system  100  corresponding to the number of inkjet head units  140  to independently operate the plurality of inkjet head units  140 . Meanwhile, a single inkjet head movement unit may be provided in the substrate treating system  100  to uniformly operate the plurality of inkjet head units  140 . 
     Meanwhile, although not illustrated in  FIG.  1   , the inkjet head unit  140  may include a nozzle plate, a plurality of nozzles and a piezoelectric element. The nozzle plate constitutes a body of the inkjet head unit  140 . The plurality of nozzles (e.g., 128 nozzles, 256 nozzles, etc.) 
     may be provided in a lower part of the nozzle plate in multiple columns and rows at regular intervals, and the piezoelectric element may be provided in the nozzle plate, where the number of piezoelectric elements is equal to the number of nozzles. When the inkjet head unit  140  is configured in this way, the substrate treatment solution may be jetted onto the substrate G through the nozzle according to the operation of the piezoelectric element. 
     Meanwhile, the inkjet head unit  140  can independently adjust the jetting amount of the substrate treatment solution provided through each of the nozzles according to the voltage applied to the piezoelectric element. 
     A substrate treatment solution supply unit  150  is meant to supply ink to the inkjet head unit  140 . The substrate treatment solution supply unit  150  may include a storage tank  150   a  and a pressure control module  150   b.    
     The storage tank  150   a  is meant to store the substrate treatment solution, and the pressure control module  150   b  controls the internal pressure of the storage tank  150   a . The storage tank  150   a  may supply an appropriate amount of substrate treatment solution to the inkjet head unit  140  based on the pressure supplied by the pressure control module  150   b.    
     The control unit  160  is meant to perform maintenance for the inkjet head unit  140 . Based on the measurement results of the maintenance unit  120 , the control unit  160  may correct the position of jetting the substrate treatment solution of each of the nozzles included in the inkjet head unit  140  or detect defective nozzles (i.e., nozzles that do not jet the substrate treatment solution) among the plurality of nozzles, thus perform a cleaning task on the defective nozzles. To this end, the control unit  160  may control the operations of each component constituting the substrate treating system  100 . 
     The control unit  160  may include a process controller, a control program, an input module, an output module (or a display module), and a memory module, and be implemented with a computer or a server. As described above, the process controller may include a microprocessor that executes control functions of each components constituting the substrate treating system  100 , and a control program may execute different kinds of treatments of the substrate treating system  100  under the control of the process controller. The memory module stores a program for executing different kinds of treatments of the substrate treating system  100 , i.e., a treating recipe, according to all kinds of data and treating conditions. 
     Meanwhile, as briefly described above, the substrate treating system  100  may include the fringe information measuring apparatus  200  to measure the information on the fringe region. Hereinafter, the fringe information measuring apparatus  200  will be described in detail. 
     In the substrate treating system  100  that jets the substrate treatment solution onto the substrate G using the nozzle of the inkjet head unit  140 , when performing maintenance on the nozzle by measuring the volume and speed of the droplets, it is possible to minimize the occurrence of printing defects on the substrate G. 
     A phase doppler particle analyzer (PDPA) device is a measuring instrument that measures the volume and speed of the droplets using a laser. The PDPA device can significantly increase the measurement speed as compared to the case of using a vision-type drop watcher, thereby reducing the measurement time. 
     The PDPA device may form the fringe region using the laser and measure the volume and speed of the droplets when the droplets pass through the fringe region. The fringe region refers to a light pattern formed by intersecting two laser lights and merging them at one point. 
     However, the size of the droplets jetted from the nozzle of the inkjet head unit  140  has a diameter of approximately 20   to 30  . In order to measure the volume and speed of the droplets, the droplets need to pass through the fringe region of the size of several tens of micrometers to several hundreds of micrometers. However, since both the size of the droplets and the size of the fringe region are small, it is difficult to align the position of the nozzle so that the droplets pass through the fringe region. 
     In addition, the fringe region generated by merging lasers of a few hundreds of mW is very difficult to directly observe with the eyes due to strong laser light, and since the fringe region has a high temperature, the inkjet head unit  140  may be damaged when it takes a long time to focus the nozzle. 
     The fringe information measuring apparatus  200  may measure the information on the fringe region using a thermal sensor array. The fringe information measuring device  200  can be used to quickly and accurately measure the position of the fringe region, thereby significantly reducing the time taken to focus the position of the nozzle. Moreover, using the fringe information measuring device  200 , it is possible to measure a variety of information on the fringe region, such as the size and shape of the fringe region as well as the position of the fringe region. 
       FIG.  2    is a first exemplary diagram schematically illustrating an internal configuration of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure. 
     According to  FIG.  2   , the fringe information measuring apparatus  200  may include a laser sensor  210 , a heat sensor array  220 , and a control module  230 . 
     The laser sensor  210  is meant to generate and output laser light. The laser sensor  210  may generate and output two laser lights, i.e., a first laser light and a second laser light. The laser sensor  210  may be provided as a PDPA device. 
     As illustrated in  FIG.  3   , the laser sensor  210  may output the first laser light  310  and the second laser light  320  so that the first laser light  310  and the second laser light  320  intersect at one point. A fringe region  330  may be formed in a point where the first laser light  310  and the second laser light  320  intersect.  FIG.  3    is an exemplary diagram explaining a fringe region formed according to one embodiment of the present disclosure. 
     In a thermal sensor array  220 , a plurality of thermal sensors can be arranged in a plurality of directions. The thermal sensor array  220  may include, for example, a plurality of thermal sensors  420   a ,  420   b , . . . , and  420   n  arranged in a lattice structure on a flat member  410  as illustrated in  FIG.  4   .  FIG.  4    is an exemplary diagram of a thermal sensor array included in the fringe information measuring apparatus according to one embodiment of the present disclosure. 
     The thermal sensor may be, for instance, a sensor that measures a temperature. In that case, the heat sensor array  220  may be provided as a temperature sensor array formed by multi-arraying a small or ultra-small temperature sensor (e.g., a micrometer-sized temperature sensor). 
     Thermal sensors  420   a ,  420   b , . . . , and  420   n  may be attached to a flat plate member  410  at regular intervals. In other words, the thermal sensing sensors  420   a ,  420   b , . . . , and  420   n  may be attached to the flat plate member  410  at the same interval, and be thus coordinated. Accordingly, the thermal sensor array  220  can have such a structure, thereby identifying coordinate information x, y, and z. 
     Meanwhile, the measurement range of the thermal sensing sensors  420   a ,  420   b , . . . , and  420   n  may vary according to specifications (e.g., a wavelength and power of the laser) of the PDPA device. 
     The control module  230  is meant to measure the information on the fringe region  330  formed by the laser sensor  210  using the thermal sensor array  220 . The control module  230  may obtain the information on the fringe region  330 , such as the position of the fringe region  330 , the size of the fringe region  330 , and the shape of the fringe region  330 . 
     The control module  230  may measure the information on the fringe region  330  by moving the thermal sensor array  220  in a direction in which the fringe region  330  is disposed. Specifically, when measuring the position of the fringe region  330 , the control module  230  may measure the position of the fringe region  330  by allowing the thermal sensor array  220  to pass through the fringe region  330  as illustrated in  FIG.  5   .  FIG.  5    is a first exemplary diagram explaining a method of measuring a position of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure. 
     The fringe region  330  formed at a point where the first laser light  310  and the second laser light  320  intersect has a relatively higher temperature than other regions. Accordingly, in the present embodiment, the position of the fringe region  330  may be measured by allowing the thermal sensor array  220  where the plurality of thermal sensing sensors  420   a ,  420   b , . . . , and  420   n  are multi-arrayed to pass through the fringe region  330 . 
     The control module  230  hash recognized the position information on each of the thermal sensors  420   a ,  420   b , . . . , and  420   n , which constitute the thermal sensor array  220 . In addition, each of the thermal sensors  420   a ,  420   b , . . . , and  420   n  may measure the temperature in real time, and the temperature measured at this time may be provide to the control module  230 . 
     When the thermal sensor array  220  passes through the fringe region  330 , a relatively higher temperature may be measured in the plurality of thermal sensor arrays formed along a line among the plurality of thermal sensors  420   a ,  420   b , . . . , and  420   n  constituting the thermal sensor array  220 . When the thermal sensor array  220  passes through the fringe region  330  in the horizontal direction with respect to the ground, a relatively higher temperature may be measured from the thermal sensors on a line formed in a row in the horizontal direction  10  (i.e., the first direction). Alternatively, when the thermal sensor array  220  passes through the fringe region  330  in the direction perpendicular to the ground, a relatively higher temperature may be measured from the thermal sensors on a line formed in row in the vertical direction  30  (i.e., the third direction). Alternatively, when the thermal sensor array  220  passes through the fringe region  330  diagonally with respect to the ground, a relatively higher temperature may be measured in the thermal sensors on a line formed diagonally in a row. 
     For example, as illustrated in  FIG.  6   , when a relatively higher temperature is measured from a thermal sensor  420   k  on a line than other sensors among the plurality of thermal sensors  420   a ,  420   b , . . . , and  420   n  constituting the thermal sensor array  220 , the corresponding thermal sensor  420   k  can be disposed in the center point of the fringe region  330 . Accordingly, the control module  230  may recognize the position information x k , y k , and z k  of the corresponding thermal sensor  420   k  and measure the same as the position of the fringe region  330 .  FIG.  6    is a second exemplary diagram explaining the method of measuring the position of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure. 
     As described above, in order to measure the position of the fringe region  330  using the thermal sensor array  220 , the control module  230  has to receive the information on the temperature measured in real time from each of the thermal sensor  420   a ,  420   b , . . . , and  420   n , and recognize the position information on each of the thermal sensing sensors  420   a ,  420   b , and  420   n.    
     In the present embodiment, the control module  230  can previously recognize the position information on each of the thermal sensors  420   a ,  420   b , . . . , and  420   n . In that case, the region in which the thermal sensor array  220  can move is limited, and the control module  230  can previously measure and recognize the information on each of the thermal sensors  420   a ,  420   b , and  420   n  within the movement area. 
     The position information on each of the thermal sensing sensors  420   a ,  420   b , . . . , and  420   n  may be measured in real time, and the position information measured at this time may be provided to the control module  230 . Taking into account this aspect, the fringe information measuring apparatus  200  may further include a camera sensor  240  as illustrated in  FIG.  7   .  FIG.  7    is a second exemplary diagram schematically illustrating an internal configuration of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure. 
     The camera sensor  240  may photograph the thermal sensor array  220 . The control module  230  may recognize the position information for each of the thermal sensors  420   a ,  420   b , . . . , and  420   n  constituting the thermal sensor array  220  based on image information obtained by the camera sensor  240 . 
     As described above, the thermal sensor array  220  may pass through the fringe region  330  to measure the position of the fringe region  330 . Accordingly, when the thermal sensor array  220  moves, the camera sensor  240  can photograph the thermal sensor array  220  in real time, and the control module  230  can recognize the position information of each of the thermal sensors  420   a ,  420   b , . . . , and  420   n  in real time. 
     The method of measuring the position of the fringe region  330  using the thermal sensor array  220  has been described above with reference to  FIGS.  5  and  6   . In the present embodiment, not only the position of the fringe region  330  but also the size of the fringe region  330  and the shape of the fringe region  330  may be measured using the thermal sensor array  220 . 
     For example, in the case of the size of the fringe region  330 , when a relatively higher temperature is measured in four thermal sensors  420   p ,  420   q ,  420   u  and  420   v  than the average temperature of all the thermal sensors  420   a ,  420   b , . . . , and  420   n  constituting the thermal sensor array  220 , as illustrated in  FIG.  8   , the control module  230  can estimate the size (x*y) of the fringe region  330  based on the size obtained by merging the four thermal sensors  420   p ,  420   q ,  420   u  and  420   v .  FIG.  8    is a first exemplary diagram explaining a method of measuring the size of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure. 
     Furthermore, for example, in the case of the shape of the fringe region  330 , as illustrated in  FIGS.  9  and  10   , it is possible to estimate whether or not the shape of the fringe region  330  is circular or elliptical based on thermal sensors that measure temperatures relatively higher than the average temperature of all the thermal sensors  420   a ,  420   b , . . . , and  420   n.    
     As described above,  FIG.  9    is an example in which the shape of the fringe region  330  is estimated to be circular, and  FIG.  10    is an example in which the shape of the fringe region  330  is estimated to be elliptical.  FIG.  9    is a first exemplary diagram explaining a method of measuring the shape of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure, and  FIG.  10    is a second exemplary diagram explaining the method of measuring the shape of the fringe region of the fringe information measuring apparatus constituting the substrate treating system according to one embodiment of the present disclosure. 
     However, in the aforementioned description, the position, size, and shape of the fringe region  330  are measured by moving the thermal sensor array  220 , but the present embodiment is not limited thereto, and the position, size, and shape of the fringe region  330  can be measured by fixing the position of the thermal sensor array  200  and moving the position of the fringe region  220 . In that case, when previously measuring the position information on each of the thermal sensors  420   a ,  420   b , . . . , and  420   n  constituting the thermal sensor array  220 , the fringe information measuring apparatus  200  may not include the camera sensor  240 . 
     Meanwhile, when at least one of the two or more lasers of the PDPA device changes, the measured value of the thermal sensor (e.g., the measured temperature in the case of the temperature sensor) may vary. For example, when there is the problem with at least one of the two lasers, the fringe region  330  formed by the two lasers may not be formed, or the temperature measured in the fringe region  330  will be measured lower than a previously known temperature. In the present disclosure, in that case, the PDPA device is considered to have been abnormal, and it can be confirmed whether or not the PDPA device is abnormal. 
     Meanwhile, in the present disclosure, it is also possible to measure the size and shape of the fringe region  330  and use the same to determine whether or not the PDPA device is abnormal. When there is the problem with at least one of the two lasers, the fringe region  330  formed by the two lasers will not be formed, or the size or shape of the fringe region  330  will be different from a previously known size or shape. Accordingly, it can be determined whether or not the PDPA device is abnormal. 
     Meanwhile, although not illustrated in  FIGS.  2  and  7   , the fringe information measuring apparatus  200  may further include a power module. The power module may serve to supply power to each component constituting the fringe information measuring apparatus  200 . 
     Meanwhile, although not illustrated in  FIG.  1   , the substrate treating system  100  may further include a camera sensor to align the position of the nozzle constituting the inkjet head unit  140  based on the position of the fringe region  330  measured by the fringe information measuring apparatus  200 . 
     Hereinafter, the camera sensor  240  described with reference to  FIG.  7    is defined as a first camera sensor, and the camera sensor described herein is defined as a second camera sensor, and these two camera sensors will be distinguished from each other. 
     The second camera sensor measures position information on each nozzle provided in the inkjet head unit  140 . When the second camera sensor photographs the nozzle of the inkjet head unit  140  and provides the image information to the control unit  160 , the control unit  160  may analyze the image information to realize the position of the nozzle. 
     When the position of the nozzle is recognized based on the information obtained by the second camera sensor, the control unit  160  may align the position of the nozzle using the position information of the fringe region  330  measured by the fringe information measuring apparatus  200 . Accordingly, in the present disclosure, the volume and speed of the droplets can be analyzed within a short period of time by allowing the droplets jetted by the nozzle accurately to pass through the fringe region  330 . 
     In order to measure the droplets jetted from the nozzle of the inkjet head unit  140 , the droplets need to pass through the fringe region  330  formed by two laser lights (i.e., the first laser light  310  and the second laser light  320 . To this end, the position of the nozzle and the position of the fringe region  330  have to be aligned, and, since the size of the droplets and the size of the fringe region  330  are very small, performing this task may be time-consuming. 
     When the plurality of thermal sensors  420   a ,  420   b , . . . , and  420   n  for aligning the positions between the nozzle and the fringe region  330  use the thermal sensor array  220  arranged in a lattice structure, the position of the fringe region  330  can be coordinated so as to reduce the alignment time from several hours to less than several minutes. As described above, the position of the nozzle may be easily obtained from coordinates by the image obtaining method using the second camera sensor, but it is impossible to directly coordinate the position of the fringe region  330 . 
     In the present disclosure, by multi-arraying micrometer-sized thermal sensing sensors  420   a ,  420   b , . . . , and  420   n , the temperature can be analyzed when they pass through the fringe region  330 , thereby accurately obtaining the position of the fringe region  330 . 
     Meanwhile, in the present disclosure, it is also possible for the first camera sensor to perform the role of the second camera sensor instead. 
     The fringe information measuring apparatus  200  and the substrate treating system  100  including the same have been described above with reference to  FIGS.  1  to  10   . The fringe information measuring device  200  is a laser fringe coordinate acquisition system that can obtain information such as the laser position (x, y, z), size and shape of the laser of the PDPA device using the thermal sensor (e.g., a temperature sensor). When the PDPA device or the thermal sensor moves and the fringe region simultaneously irradiates the thermal sensor, the position, size, and shape of the fringe region can be identified using the coordinates and temperature data of the measured sensor. 
     When the thermal sensors  420   a ,  420   b , . . . , and  420   n  move and passes through the fringe region  330 , a position where the temperature reaches its maximum point is a position of a center point of the fringe region  330 . Accordingly, in the present disclosure, the thermal sensor array  220  can be allowed to pass through the fringe region  330 , thereby confirming the information on the position, size, and shape of the fringe region  330 . When using the PDPA device in the inkjet facility, it is possible to improve the measurement accuracy by identifying the position and size of the fringe region  330 , which has previously been problematic using the aforementioned method. 
     Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, the present disclosure is not limited to the disclosed embodiments, but may be implemented in various different ways, and the present disclosure may be embodied in many different forms without changing technical subject matters and essential features as will be understood by those skilled in the art. Therefore, embodiments set forth herein are exemplary only and not to be construed as a limitation.