JP2006267603A - Spacer coating device and spacer coating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spacer coating device capable of arranging more than a reference number of spacers at a discharge position. <P>SOLUTION: A printing head 21 and a detecting device 23 are arranged on a coating base 13 and discharged liquid is discharged onto the discharge position from the printing head 21 to arrange spacers. A detecting device 23 counts the spacers arranged at the discharge position, sets a deficient discharge position A<SB>x,y</SB>to a re-discharge position, and discharges discharged liquid from the same printing head 21 to add spacers. The processing object 11 where more than a reference number of spacers are arranged can be taken out of the spacer coating device 1. The printing head discharging the discharge liquid to the discharge position discharges the discharged liquid to the re-discharge position, so this spacer coating device 1 is small-sized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for disposing a spacer on a processing object, and more particularly to a spacer coating apparatus for disposing a spacer by discharging a discharge liquid in which spacers are dispersed onto the processing object.

  Conventionally, spacers have been inserted between the substrates holding the liquid crystal of the liquid crystal panel in order to keep the distance between the substrates constant.

  Since the ink jet printer can precisely control the discharge amount and the discharge position, the discharge liquid in which the spacer is dispersed is discharged instead of the ink, and the spacer is arranged on the color filter or the substrate.

  However, even if a certain amount of discharge liquid is discharged onto the object to be processed, the same number of spacers are not always contained in the discharge liquid. If there is a discharge position where the number of spacers is less than the required number, the distance between the substrates becomes non-uniform, causing color irregularities and the like.

As for the arrangement method of the spacer, there are the following prior arts.
JP-A-11-24083 JP 2002-372717 A JP 2002-72218 A JP 2005-4094 A

  The present invention was created to solve the above-described disadvantages of the prior art, and an object of the present invention is to provide a spacer coating apparatus that can eliminate the uneven arrangement of the spacers and can dispose a reference number or more of spacers at the discharge position. It is in.

In order to solve the above problems, the present invention provides a discharge table on which a processing object is arranged, a print head that discharges a discharge liquid in which spacers are dispersed to a discharge position on the surface of the processing object, and a state of the discharge position. A detection device that detects the relative position relationship between the processing object and the print head disposed on the ejection table, and a movement device that changes a relative positional relationship between the processing object and the detection device. And a control device that selects a re-ejection position from the ejection position based on the detection result of the detection device, and the print head and the detection device are disposed on the ejection table, and the ejection liquid is delivered to the ejection position. It is a spacer coating device configured such that the ejected print head ejects the ejection liquid to the re-ejection position.
Further, according to the present invention, the control device counts the number of the spacers on the discharge position from the detection result of the detection device, and selects the re-discharge position from the discharge position in comparison with a reference number. It is.
Further, the present invention is a spacer coating device configured such that the detection device reciprocates together with the print head along a movement path that intersects a relative movement direction of the processing object. .
Further, in the present invention, the detection device that follows the print head detects the state of the discharge position while the print head discharges the discharge liquid to the discharge position during the reciprocating movement, and the print head includes: It is a spacer coating device configured to discharge the discharge liquid to a re-discharge position selected at the time of backward movement.
In addition, the present invention provides a discharge table on which a processing object is disposed, a print head that discharges a discharge liquid in which spacers are dispersed to the surface of the processing object, and a detection device that detects a state of the surface of the processing object. The processing object disposed on the discharge table and the print head are relatively moved, the discharge liquid is discharged from the print head to a predetermined discharge position, and the discharge liquid is discharged to the discharge position. Is moved relative to the inspection apparatus, the detection device detects a state on the discharge position, and the re-discharge position is determined from the discharge position based on the detection result of the detection device. A spacer coating method that selects and discharges the discharge liquid from the print head to the re-discharge position.
Further, the present invention is a spacer coating method in which the number of the spacers on the discharge position is counted from the detection result of the detection device, and the re-discharge position is selected from the discharge position by comparison with a reference number.
Further, the present invention provides the discharge position where the discharge liquid has already been discharged by the detection apparatus while moving the detection apparatus together with the print head and discharging the discharge liquid to the discharge position by the print head. This is a spacer coating method for detecting the state.
The present invention is also a spacer coating method in which the detection device and the print head are reciprocated together.

  The present invention is configured as described above, the print head and the detection device are arranged on one discharge table, and when the object to be processed, the print head, and the detection device relatively move on the discharge table, Spacers are arranged at the ejection positions by the print head, and ejection positions where the number of spacers is insufficient are detected by the detection device.

  Then, the ejection position where the number of spacers is insufficient is set as the re-ejection position, and the spacer is added to the re-ejection position by the same print head in which the spacer is arranged at the ejection position.

  The detection device and the print head can be fixed to each other and configured to move relative to the object to be processed together. In this case, the detection device can be arranged on one side or both sides of the print head, or can be arranged along the moving direction of the processing object with respect to the print head.

  When the processing object moves on the processing table, the print head and the detection device are configured to move in a direction intersecting the movement path of the processing object, in particular, in a direction perpendicular to the movement path of the processing object. Can do.

  On the other hand, when the object to be processed is stationary on the processing table, the print head and the detection device can be configured to move in a direction crossing each other, particularly in a direction perpendicular to each other.

  In short, it is sufficient that the print head can be relatively moved so that the discharge liquid can be discharged to a desired discharge position on the processing object, and the detection device can be relatively moved so that the state of the discharge position on the processing object can be detected. Good.

  In particular, in the case of having a moving device that moves a processing object arranged on the discharge table along a predetermined movement path, a print head that discharges a discharging liquid in which spacers are dispersed to a discharging position on the surface of the processing object. A detection device that detects the state of the discharge position, and a control device that selects a re-discharge position from the discharge position based on a detection result of the detection device, and the print head and the detection device are connected to the discharge table. A print head that is arranged on the moving path of the processing object and that discharges the discharge liquid to the discharge position can discharge the discharge liquid to the re-discharge position.

In this case, the detection device can be configured to reciprocate together with the print head along a movement path that intersects the movement path of the processing object.
When the print head and the detection device are configured to reciprocate on the same movement path, the print head discharges a discharge liquid to a discharge position when the processing object moves forward and backward. The detection device that follows the print head detects the state of the discharge position, and the print head discharges the discharge liquid to a re-discharge position that is selected when the processing object moves backward. it can.

  On the other hand, when the print head is configured to reciprocate in two directions intersecting each other on the processing table, and the detection device is configured to reciprocate in two directions intersecting each other on the processing table, The print head can be reciprocated in the two directions, the discharge liquid can be discharged to the discharge position, and the detection device can be reciprocated in the two directions to detect the state of the discharge position.

In that case, the print head and the detection device can be relatively fixed and reciprocated together.
In addition, while the print head discharges the discharge liquid to the discharge position, the detection device can detect the state of another discharge position immediately after discharge and set the re-discharge position.

  In that case, after the print head discharges the discharge liquid to all of the discharge positions to be discharged, the discharge liquid can be discharged to the re-discharge position. When the reciprocating movement of the print head moves, the discharge device discharges the discharge position, and the detection device detects the state of the discharge position, and discharges the discharge liquid to the set re-discharge position when the print head moves backward. it can.

  A processing object in which a reference number or more of spacers are arranged at a predetermined discharge position can be taken out from the spacer coating apparatus.

  Reference numeral 1 in FIGS. 1 and 2 represents a spacer coating apparatus of a first example of the present invention. FIG. 1 is a side view of the spacer coating apparatus 1 viewed from the lateral direction, and FIG. 2 is a plan view viewed from above.

The spacer coating apparatus 1 has a discharge table 13.
Above the predetermined position of the discharge table 13, a first place 15 where the unprocessed processing object 11 is arranged and a second place 16 on the discharge table 13 that is separated from the first place 15. And the processing object 11 is set between the first and second locations 15 and 16 with the first location 15 as the starting point and the second location 16 as the turning point. Are configured to reciprocate.

  Reference numeral 30 in FIG. 1 indicates a reciprocating movement path, and a print head 21 is disposed between the first place 15 and the second place 16 on the moving path 30. A detection device 23 is disposed between the print head 21 on the path 30 and the second location.

  Hereinafter, the procedure of spacer application when the processing object 11 is a color filter will be described. However, the processing object 11 of the present invention is not limited to a color filter.

  FIG. 9 is a plan view for explaining the surface of the untreated object 11. In the case of a color filter, red, green, and blue window portions 55R, 55G, and 55B corresponding to each color of R, G, and B are regularly arranged on the surface, and the window portions 55R, 55G, and 55B of the respective colors are arranged. , BM (black matrix) lines 56.

Here, the BM line 56 extends in the vertical and horizontal directions and is formed in a lattice shape, and the intersection position A _{x, y} between the horizontal direction X and the vertical direction Y is set to the discharge position A _{x, y} suitable for arranging the spacer. It has become.

In FIG. 9 and FIGS. 10 and 11 to be described later, the subscripts x = 1 to 4, y = 1 and 2, and eight discharge positions A _1,1 to A _4,2 are shown.

  A moving device (not shown) is connected to the print head 21 and the inspection device 23, and the print head 21 and the inspection device 23 are in a horizontal plane and in a direction substantially perpendicular to the movement path 30 of the processing target 11. It is configured to be able to reciprocate. Reference numerals 31 and 33 in FIG. 2 indicate movement paths of the reciprocating movement of the print head 21 and the detection device 23, respectively.

  When the processing object 11 arranged at the first location 15 starts moving toward the second location 16 by the moving device, first, the processing object 11 has the first ejection position at the print head 21. Is temporarily stopped at a position below the movement path 31 of the first position.

  A discharge liquid supply device 25 and a control device 20 are connected to the print head 21. The discharge liquid supply device 25 stores a discharge liquid in which spacers are dispersed in a dispersion liquid.

  The control device 20 controls the discharge of the discharge liquid from the print head 21 in addition to the movement of the processing object 11 and the print head 21. The print head 21 is configured to move on the movement path 31 and discharge a predetermined amount of discharge liquid at a desired position.

  The control device 20 stores the discharge position and the discharge amount in advance. When the print head 21 passes over the discharge position, the control device 20 discharges the discharge liquid from the print head 21 toward the discharge position. It is configured to be. Instead of discharging the discharge liquid while the print head 21 is moving, the print head 21 may be temporarily stopped on the discharge position and discharged toward the discharge position.

  The print head 21 is configured to be able to discharge the discharge liquid to the discharge position during both the forward movement and the backward movement, and the print head 21 moves along the movement path 31 while the processing target 11 is stationary. When the discharge liquid is discharged to a discharge position that can be discharged by moving up, the processing object 11 is moved in the direction of the second location 16. Due to the movement, the processing object 11 is stopped again when the next ejection position is located directly below the movement path 31 of the print head 21.

Then, the print head 21 moves on the movement path 31 and the discharge liquid is discharged to a new discharge position.
The discharge liquid contains spacers at a predetermined content (number / volume). When the discharge liquid lands on the discharge position, the spacers contained in the discharge liquid are dispersed in the dispersion liquid. Is disposed on the discharge position of the processing object 11. The spacer is fixed at the discharge position when the dispersion liquid dries.

In the spacer coating apparatus 1 of this first example, the discharge liquid is landed on all the discharge positions A _{x, y} of the processing object 11 by the print head 21, and after the spacers are arranged, the print liquid is sent directly below the detection apparatus 23. It is done.

Reference numeral 50 in FIG. 10 indicates one or a plurality of spacers arranged by discharging discharge liquid from the print head 21 to discharge positions A _{x, y} (x = 1 to 4, y = 1, 2). ing. The dispersion is dried.

The detection device 23 detects the state of the discharge position A _{x, y} while moving along the movement path 33. For example, the detection device 23 captures the state of all the ejection positions A _{x, y} of the processing object 11 and transmits it to the control device 20 as a detection result. Here, the movement path 33 of the detection device 23 is separated in parallel with the movement path 31 of the print head 21.

The control device 20 analyzes the detection result of the detection device 23, recognizes the spacer 50, counts the number of each of the discharge positions A _{x, y} , and uses the reference number stored in advance and the counted number as the discharge position A. Compare every _{x and y} .

  Even if the amount of the discharge liquid is constant, the number of spacers 50 contained in the discharge liquid is not constant, and may be zero at the minimum.

  The detection device 23 sets and stores discharge positions less than the reference number as re-discharge positions based on the comparison result between the counted number and the reference number.

If the place where the processing object 11 is located after the states of all the discharge positions A _{x, y} are detected is the second place 16, the processing object 11 is discharged from the second place 16. The object to be processed before being moved is moved toward the first place 15 where the object is located.

  In FIG. 2, the second location 16 is separated from the reciprocating region of the detection device 23, but a part of the second location 16 may be located directly below the reciprocation of the detection device 23.

Here, in the discharge positions indicated by reference numerals A _2,1 and A _3,2 in FIG. 10, the number of the spacers 50 arranged is less than the reference number, and is set to the re-discharge position.

  Assuming that the movement direction of the processing object 11 when the discharge liquid is discharged is a forward movement, the movement from the second place 16 toward the first place 15 is a backward movement. 11 passes through a position directly below the movement path 31 of the reciprocating movement of the print head 21.

  At that time, the processing object 11 is temporarily stopped when the re-ejecting position reaches a position directly below the moving direction of the print head 21, and is ejected toward the re-ejecting position when the print head 21 moves on the movement path 31. Liquid is discharged and spacers are added.

FIG. 11 shows a state in which more than the reference number of spacers 50 are arranged as a result of the discharge liquid being discharged to the re-discharge positions A _2,1 and A _3,2 and the addition of the spacers. The discharge liquid is not discharged to other discharge positions that have not been set as the re-discharge position, and therefore no spacer is added.

  After the print head 21 moves along the movement path 31 and discharges the discharge liquid to a re-discharge position within a dischargeable range, the processing object 11 is moved in the direction of the first place 15 and the non-discharge re-discharge position is When reaching the position directly below the movement path 31 of the print head 21, the processing object 11 is stopped again, and the discharge liquid is discharged to the re-discharge position.

  As described above, the processing object 11 can obtain the processing substrate 11 in which the spacer is added to the re-ejection position before returning to the first place 15 and the reference number or more of spacers are arranged at the ejection position.

  Since the discharge to the discharge position and the discharge to the re-discharge position can be performed by the same print head 21, the spacer coating apparatus can be downsized.

  The control device 20 controls the operations of the print head 21 and the detection device 23. However, the present invention also includes a configuration in which the print head 21 and the detection device 23 are controlled by different control devices.

Further, although the detection device 23 has reciprocated on the movement path 33, it is not always necessary to move, and it is only necessary to be able to count the number of spacers on the ejection position A _{x, y} even in a stationary state.

In the spacer coating apparatus 1, the number of the spacers 50 is counted by the detection device 23 after the discharge liquid is discharged to all the discharge positions A _{x, y} on the processing object 11. And the detection device 23 may be arranged close to each other, and the state of the discharge position that has already been discharged may be detected while discharging the discharge liquid.

  In this case, a heating device can be provided inside the discharge table 13 so that the dispersion in the discharge liquid can be quickly dried.

Next, another embodiment of the present invention will be described.
Reference numeral 2 in FIGS. 3 and 4 is a spacer coating apparatus of the second example of the present invention. The same components as those of the coating apparatus 1 of the first example are denoted by the same reference numerals and description thereof is omitted.

  In the spacer coating apparatus 1 of the first example, the print head 21 and the detection apparatus 23 are configured to reciprocate independently along different movement paths 31 and 33 parallel to each other. In the coating device 2, the detection device 23 is fixed to one side of the print head 21, and the print head 21 and the detection device 23 are configured to reciprocate together on the same movement path 34. The movement path 34 of the print head 21 and the detection device 23 is in a horizontal plane and intersects the movement path 31 of the processing object 11 substantially perpendicularly.

  Of the reciprocating movements of the print head 21, if the print head 21 is at the head and the detection device 23 is at the rear, the reverse movement is when the print head 21 is at the rear and the detection device 23 is at the head. When the print head 21 moves forward, the print head 21 discharges the discharge liquid to a discharge position where the discharge liquid has not landed and causes the discharge liquid to land.

Then, the detection device 23 that moves together with the print head 21 and arrives at the discharge position later than the print head detects the state of the discharge position immediately after landing and transmits the detection result of the control device 20.
The control device 20 counts the number of spacers, and sets a discharge position where the number of spacers is insufficient compared to the reference number as a re-discharge position.

  Then, the print head 21 is controlled, and when the print head 21 and the detection device 23 move backward and pass over the same discharge position as in the forward movement, the discharge liquid is discharged to the re-discharge position, and the spacer is set to the re-discharge position. to add.

  Therefore, in this spacer coating device 2, while the processing object 11 is stationary, the print head 21 and the detection device 23 reciprocate on the reference position at the discharge position in the range along the movement path 34. More than the number of spacers can be arranged.

After the print head 21 and the detection device 23 perform a reciprocating movement once, and the ejection and re-ejection are performed, the processing object 11 moves along the movement path 30, and the ejection position of the unlanded landing is the print head 21. When the object 11 arrives at a position directly below the movement path 34 of the detection device 23, the processing object 11 is stopped again, and the print head 21 and the detection device 23 are reciprocated to perform discharge and re-discharge.
The processing object 11 in which a reference number or more of spacers are arranged at the discharge position is taken out from the spacer coating apparatus 2 and sent to a subsequent process.

  In the third example of the spacer coating apparatus 3 shown in FIGS. 5 and 6, detection devices 23 a and 23 b are arranged on both sides of the print head 21. A movement mechanism (not shown) is arranged on the printing stand 13, and the processing object 11 is configured to reciprocate on a movement path 30 connecting the first place 15 and the second place 16. Yes. The print head 21 and the detection devices 23 a and 23 b are located between the first location 15 and the second location 16.

  The print head 21 discharges the discharge liquid to the discharge position while moving on a movement path 34 that intersects the movement path 30 of the processing target 11 substantially perpendicularly. When the print head 21 moves forward and discharges the discharge liquid to the discharge position, the processing object 11 is moved and stopped when the undischarged discharge position arrives at a position directly below the movement path 31 of the print head 21. The discharge liquid can be discharged while 21 moves backward.

  The two detection devices 23 a and 23 b move on the same movement path 34 as the print head 21. That is, the two detection devices 23a and 23b and the print head 21 are arranged in a line on the movement path 34 with the print head 21 at the center, and during the movement, of the two detection devices 23a and 23b, One is the head and the other is the tail.

  Since the detection devices 23a and 23b located at the tail of the print head 21 can detect the state of the discharge position where the discharge liquid has landed while moving together with the print head 21, the spacer coating device 3 can detect the second discharge position. Unlike the spacer coating apparatus 2 of the example, the state of the discharge position can be detected while discharging the discharge liquid both in the forward movement and in the backward movement.

That is, as the print head 21 reciprocates and discharges the discharge liquid, the detection devices 23a and 23b, which are the tail, detect the state of the discharge position immediately after landing and transmit it to the control device 20.
The control device 20 counts the number of spacers from the detection state, sets the shortage position as the re-discharge position, and stores it.

  After the discharge liquid is discharged to all discharge positions on the processing object 11 and the state is detected and the re-discharge position is set, the processing object 11 is moved from the second place 16 to the first place 15. Moved towards. That is, the processing object 11 is moved back to the first location 15, and when the re-ejection position reaches a position directly below the movement path 34 of the print head 21, the processing object 11 is temporarily stopped and is moved from the print head 21. Discharge liquid is discharged to the re-discharge position.

  After the discharge liquid is discharged to the re-discharge position that is directly below the movement path 34 and the spacer is added, the processing object 11 is moved in the direction of the first location 15, and the unprocessed re-discharge position is lightly moved 34. When the position reaches just below the position, it is stopped and a spacer is added by the print head 21.

Next, the spacer coating apparatus 4 of the fourth example of FIGS. 7 and 8 will be described.
In the second and third spacer applicators 2 and 3, detection devices 23, 23 a and 23 b are arranged on one side or both sides of the print head 21, and the print head 21 and the detection devices 23, 23 a and 23 b In the fourth example of the spacer coating device 4, the detection device 23 is downstream of the print head 21, that is, the detection device 23 is second than the print head 21. It is located on the 15th side.

  Therefore, although the detection device 23 and the print head 21 are fixed to each other and reciprocate together, the movement path 31 of the print head 21 and the movement path 33 of the detection device 23 are different and are separated from each other in parallel.

  The discharge position where the discharge liquid has landed by the print head 21 is moved to the second place 16 when the processing target 11 is moved and positioned directly below the movement path 33 of the detection device 23. The state of the surface is detected by the detection device 23 that moves together with the control device 20 and transmitted to the control device 20. Accordingly, ejection and detection are performed simultaneously.

  The print head 21 may discharge the discharge liquid during both the forward movement and the backward movement on the movement path 31, or discharge the discharge liquid only during either the forward movement or the backward movement. You may make it do.

  When the state of all the ejection positions is detected by the detection device 23 and the re-ejection position is set, the processing object 11 that has once passed the position immediately below the print head 21 is moved in the direction of the first place 15 and printed. It passes through the position just below the movement path 31 of the head 21 again.

  The processing object 11 is a color filter. However, the present invention is not limited to this, and may be a substrate on the array side, and widely includes ones whose ejection positions are determined.

  Furthermore, even if the ejection position is not determined in advance, any spacer coating apparatus that can count the spacers at the positions ejected from the print head 21 with the detection device 23 and can replenish the positions with the same print head 21 can be used. It is included in the present invention.

  In the above embodiment, the processing object 11 is moved. However, even if the processing object 11 is stationary, the print head 21 is moved in two directions intersecting the processing object 11, particularly in two directions intersecting vertically. In addition to the movement, the detection devices 23, 23 a, and 23 b may be moved in two directions that intersect with each other with respect to the processing object 11, particularly in two directions that intersect perpendicularly.

  Even in this case, the same relative movement as the relative movement between the processing object 11 and the print head 21 and the detection devices 23, 23a, and 23b in each of the above embodiments can be realized.

  In short, according to the present invention, the print head 21 and the detection devices 23, 23a, and 23b move relative to the processing object 11, regardless of whether the processing object 11 is stationary or moved, and the print head A wide variety of spacer coating apparatuses and spacer coating methods are disclosed that discharge the discharge liquid from the discharge position 21 to the discharge position, detect it with a detection device, and discharge the discharge liquid from the same print head to the set re-discharge position.

  Even when the processing object 11 is stationary, the print head 21 and the detection devices 23, 23a, and 23b can be relatively fixed and moved together.

Schematic side view of the spacer coating apparatus of the first example of the present invention Schematic plan view Schematic side view of the spacer coating apparatus of the second example of the present invention Schematic plan view Schematic side view of the spacer coating apparatus of the third example of the present invention Schematic plan view Schematic side view of the spacer coating apparatus of the fourth example of the present invention Schematic plan view Schematic plan view for explaining the application position of the processing object Schematic plan view for explaining the state of the spacers arranged by the print head Schematic plan view for explaining a state in which a spacer is added

Explanation of symbols

1 to 4 ... spacer coating device 13 ... discharge table 11 ... processing object (substrate)
21 …… Print head 23, 23a, 23b …… Detecting device 50 …… Spacer

Claims (8)

A discharge table on which a processing object is placed;
A print head for discharging a discharge liquid in which spacers are dispersed to a discharge position on the surface of the object to be processed;
A detection device for detecting the state of the discharge position;
A moving device that changes a relative positional relationship between the processing object and the print head disposed on the ejection table, and a relative positional relationship between the processing object and the detection device;
A control device that selects a re-discharge position from the discharge position based on the detection result of the detection device;
The print head and the detection device are disposed on the discharge table,
A spacer coating apparatus configured such that a print head that discharges discharge liquid to the discharge position discharges the discharge liquid to the re-discharge position.   2. The spacer coating apparatus according to claim 1, wherein the control device counts the number of the spacers on the discharge position from the detection result of the detection device, and selects the re-discharge position from the discharge position in comparison with a reference number.   The detection device is configured to reciprocate together with the print head along a movement path that intersects a relative movement direction of the processing object. The spacer coating apparatus according to item. When the reciprocating movement moves, the detection device that discharges the discharge liquid to the discharge position and follows the print head detects the state of the discharge position;
The spacer coating apparatus according to claim 3, wherein the print head is configured to discharge the discharge liquid to a re-discharge position selected at the time of backward movement. A discharge table on which a processing object is placed;
A print head for discharging a discharge liquid in which spacers are dispersed to the surface of the object to be processed;
A detection device that detects a state of the surface of the processing object;
Relatively moving the processing object disposed on the discharge table and the print head, and discharging the discharge liquid from the print head to a predetermined discharge position;
Relatively moving the processing object to which the discharge liquid is discharged to the discharge position and the inspection apparatus, and causing the detection apparatus to detect a state on the discharge position;
A spacer coating method that selects a re-ejection position from the ejection position based on a detection result of the detection device, and ejects the ejection liquid from the print head to the re-ejection position.   The spacer coating method according to claim 5, wherein the number of the spacers on the ejection position is counted from the detection result of the detection device, and the re-ejection position is selected from the ejection positions by comparison with a reference number.   The detection device is moved together with the print head, and the state of the discharge position where the discharge liquid has already been discharged is detected by the detection device while discharging the discharge liquid to the discharge position by the print head. The spacer application | coating method of any one of Claim 5 or Claim 6.   The spacer coating method according to claim 7, wherein the detection device and the print head are reciprocated together.

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