Display panel manufacturing system, error correction method thereof and display panel manufacturing method

Abstract

The invention relates to a display panel manufacturing system, an error correction method thereof and a display panel manufacturing method. A display panel manufacturing system includes a stage, a head unit, a moving unit, a sensor portion, and a control portion. The stage supports the substrate. The head unit includes a nozzle for discharging ink to each pixel of a substrate. The moving unit moves the head unit relative to the substrate. The sensor section acquires an image of a region in which the head unit discharges ink. The control unit calculates an error in the correction direction between the ink ejection position and the pixel on the basis of the image, and controls the relative movement of the head unit with respect to the substrate on the basis of the calculated error. The control unit sets a plurality of reference coordinates for correcting the calculated error, and controls the amount of movement of the head unit moving in the correction direction to be constant during the relative movement of the head unit between the plurality of reference coordinates. The motion vector of the head unit until reaching the reference coordinate and the motion vector of the head unit starting from the reference coordinate are controlled so as to differ from each other.

Description

Technical Field

[0001] This invention relates to a display panel manufacturing system and its error correction method, and more specifically to a display panel manufacturing system including a nozzle for dispensing ink, and its error correction method and display panel manufacturing method. Background Technology

[0002] Inkjet printing equipment, used in display panel manufacturing systems, is a device that dispenses ink onto a substrate during the manufacturing process. Various sensors acquire information about the ink dispensing area, and software analyzes this information to correct for errors. Finally, it is confirmed that the corrected error is within the equipment's tolerance range. In the manufacturing processes of printed circuit boards, semiconductors, or display panels, inkjet printing is primarily used to dispense high-resolution ink, which is crucial for product reliability.

[0003] However, errors exist in the straightness of the axis used to move the inkjet head and the angle during movement, causing a decrease in printing precision at locations with large errors. Consequently, it may be difficult to print the color components of the display at high resolution. That is, errors may occur due to ink ejection detaching from the pixels it should be pointing to. In such cases, problems arise that render the display panel unusable; therefore, it is considered necessary to calculate and compensate for errors not only in the basic distance of the nozzles but also in the angle. Summary of the Invention

[0004] The present invention is proposed to solve the above-mentioned problems, and its purpose is to provide a display panel manufacturing system and method for dispensing ink to a precise location.

[0005] Specifically, this invention measures and calculates the error in the correction direction, calculates multiple reference coordinates, and uses these reference coordinates as a basis for error compensation, thereby accurately dispensing ink. In other words, the aim is to manufacture high-resolution display panels.

[0006] The display panel manufacturing system of this invention includes a worktable, a head unit, a moving unit, a sensor unit, and a control unit. The worktable supports a substrate. The head unit includes nozzles for dispensing ink to individual pixels of the substrate. The moving unit moves the head unit relative to the substrate. The sensor unit acquires an image of the area where the head unit dispenses ink. The control unit calculates the error in the correction direction between the ink dispensing position and the pixel based on the image, and controls the relative movement of the head unit relative to the substrate based on the calculated error.

[0007] The control unit sets multiple reference coordinates for correcting the calculated error. During the relative movement of the head unit between the multiple reference coordinates, the amount of movement of the head unit in the correction direction is controlled to be constant, and the movement vector of the head unit up to the reference coordinate and the movement vector of the head unit from the reference coordinate are controlled to be different from each other.

[0008] As an example, the sensor unit is combined with the head unit to capture images of the substrate located below the head unit.

[0009] As an example, multiple reference coordinates are a portion of the pixel coordinates used to measure the ink ejection position based on the image. The control unit can replace the remaining coordinates in the measured pixel coordinates based on the result after linearly correcting the errors between the multiple reference coordinates.

[0010] As an example, when performing linear correction between multiple reference coordinates, the control unit can set multiple reference coordinates such that the difference between the coordinates of the head unit corresponding to the pixel and the linearly corrected coordinates is less than the allowable error.

[0011] As an example, the control unit can store multiple reference coordinates before the manufacturing of the display panel, and control the relative movement of the head unit relative to the substrate based on the stored multiple reference coordinates during the manufacturing of the display panel.

[0012] As an example, multiple reference coordinates can be based on the direction of relative movement of the head unit, including the initial and final coordinates of the head unit.

[0013] As an example, the correction direction can be the same as the direction of relative movement of the head unit, and the control unit can calculate the error based on the position of ink ejection of at least one of the outermost nozzles in the correction direction.

[0014] As an example, the correction direction may be perpendicular to the direction of relative movement of the head unit, and the control unit may calculate the error based on the position of ink ejection of at least one of the outermost nozzles located in the correction direction.

[0015] As an example, the correction direction can be the direction of rotation with the rotation axis perpendicular to the direction of relative movement of the head unit, and the control unit can calculate the error based on the position of ink ejection of at least one of the outermost nozzles in the direction of relative movement.

[0016] As an example, the correction direction can be the direction of rotation with the direction of relative movement of the head unit as the rotation axis, and the control unit can calculate the error based on the ink ejection position of at least one of the outermost nozzles in the nozzle located in a direction perpendicular to the direction of relative movement.

[0017] As an example, the correction direction can be the direction of rotation with the ink ejection direction as the rotation axis, and the control unit can calculate the error based on the position of ink ejection of at least one of the outermost nozzles located in the long side direction of the head unit.

[0018] As an example, the moving unit can move the head unit in a first direction and can move the substrate in a second direction that intersects the first direction.

[0019] An error correction method for a display panel manufacturing system according to an embodiment of the present invention may include the following steps: a head unit moves relative to a substrate while dispensing ink onto the substrate; a sensor unit acquires an image of the area where the ink is dispensed; based on the image, the error in the correction direction between the ink dispensing position and the pixels of the substrate is calculated; multiple reference coordinates are set for correcting the calculated error; and linear correction (average value) is performed between the multiple reference coordinates, wherein the multiple reference coordinates are set such that the difference between the coordinates of the head unit corresponding to the area where the ink is dispensed and the linearly corrected coordinates is less than the allowable error.

[0020] As an example, the step of setting multiple reference coordinates may include the following steps: setting a first reference coordinate among multiple reference coordinates; obtaining the coordinates of the ejected ink; performing linear correction between the first reference coordinate and the obtained coordinates; determining whether the difference between the ejected ink coordinates and the linearly corrected coordinates between the first reference coordinate and the obtained coordinates exceeds the allowable error; and if the allowable error is exceeded, setting the coordinates of the ejected ink that are before the obtained coordinates as the second reference coordinate.

[0021] As an example, in the step of determining whether the allowable error is exceeded, if the allowable error is not exceeded, the following steps may be further included: obtaining the coordinates of the next ink ejection; performing linear correction between the obtained next coordinates and the first reference coordinates; and determining whether the difference between the coordinates of the ejected ink and the linearly corrected coordinates between the first reference coordinates and the obtained next coordinates exceeds the allowable error.

[0022] As an example, multiple reference coordinates can be based on the direction of relative movement of the head unit, including the initial and final coordinates of the head unit.

[0023] The display panel manufacturing method of the present invention may include the following steps: supporting a substrate on a worktable; placing a head unit above the substrate; moving the head unit with a first movement vector and ejecting ink until a reference coordinate is reached; and moving the head unit from the reference coordinate with a second movement vector different from the first movement vector and ejecting ink, wherein when performing linear correction between the reference coordinate and the initial coordinate of the head unit, the reference coordinate is set such that the difference between the pixel coordinate of the ejected ink and the linearly corrected coordinate is less than an allowable error, and when performing linear correction between the pixel coordinate of the ejected ink after the reference coordinate and the initial coordinate, the reference coordinate is set such that the difference between the pixel coordinate and the linearly corrected coordinate exceeds an allowable error.

[0024] As an example, the reference coordinates can be a portion of the pixel coordinates of the ink ejection position measured based on the image acquired by the sensor unit, and the remaining coordinates in the measured pixel coordinates can be replaced based on the result of linear correction of the error between multiple reference coordinates.

[0025] As an example, the head unit can move along coordinates replaced by linear correction.

[0026] As an example, the substrate of the display panel manufacturing system is included in one of the following: flat panel displays, curved devices (e.g., curved displays), televisions, billboards, computer monitors, medical monitors, head-mounted displays (HMDs), indoor or outdoor lighting or signal lights, wearable devices, flexible devices (e.g., foldable devices, rollable devices, or bendable devices), electronic manuals, e-books, portable multimedia players (PMPs), personal digital assistants (PDAs), laser printers, telephones (e.g., cellular phones), tablet computers, portable terminals, notebook computers, laptop computers, digital cameras, viewfinders, video cameras, video walls containing 3D displays, virtual reality or augmented reality displays, tiled multi-display video walls, vehicles, outdoor display devices, theater or stadium screens, and signs.

[0027] According to embodiments of the present invention, the nozzle position can be precisely controlled in any printing area within the equipment to accurately dispense ink to high-resolution pixels. Consequently, the distance or angle between multiple nozzles can be maintained constant, thereby improving the process reliability of the display panel manufacturing system. However, the effects of the present invention are not limited to the above-described effects and can be extended in various ways without departing from the spirit and scope of the invention. Attached Figure Description

[0028] Figure 1 This is a schematic perspective view of a display panel manufacturing system according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic plan view of the head unit according to an embodiment of the present invention.

[0030] Figure 3 This is a plan view illustrating the nozzles and pixels of an embodiment of the present invention.

[0031] Figure 4 This is a plan view of the pitch, roll, and yaw attitudes of multiple nozzles according to the movement direction of the head unit, according to an embodiment of the present invention.

[0032] Figure 5 It is a planar diagram showing the nozzle posture as a result of the pitch of the head unit's movement, representing the amount of error in the ink ejected by the nozzle.

[0033] Figure 6 It is a planar diagram showing the nozzle posture as a result of the distance change caused by the offset of the head unit's movement, representing the amount of error in the ink ejected by the nozzle.

[0034] Figure 7 It is a planar diagram showing the nozzle posture resulting from the tumbling of the head unit, and representing the amount of error in the ink ejected by the nozzle.

[0035] Figure 8 It is a planar diagram showing the nozzle posture based on the straightness of the head unit's movement, and representing the resulting error in the amount of ink ejected by the nozzle.

[0036] Figure 9 It is a planar diagram showing the nozzle posture as a result of the yaw of the head unit's movement, representing the amount of error in the ink ejected by the nozzle.

[0037] Figure 10 It is a plan view showing the error in the first direction when the head unit is first moved in the second direction, which is the printing travel direction, as an embodiment.

[0038] Figure 11 This is a plan view showing the error in the second direction when the head unit is first moved in a first direction, which is the printing travel direction, as an embodiment.

[0039] Figure 12 This is a flowchart of an ink ejection method according to an embodiment of the present invention.

[0040] Figure 13 This is a flowchart of a datum coordinate calculation and error correction according to an embodiment of the present invention.

[0041] Figure 14 This is a flowchart illustrating how ink is dispensed in a display panel manufacturing system according to an embodiment of the present invention, reflecting correction values. Explanation of reference numerals in the attached figures 1000: Display panel manufacturing system; 100: Ejection section 110: Head unit; 111: Single head unit 120: Moving unit; 200: Sensor unit 400: Control Unit; 300: Workbench SUB: Substrate NZ: Nozzle PX: pixel Detailed Implementation

[0042] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0043] In the accompanying drawings, the proportions and dimensions of the structural elements have been exaggerated for the purpose of effectively illustrating the technical content. "And / or" includes all combinations of more than one that can be defined by the associated structures.

[0044] It should be understood that terms such as "including" are intended to specify the presence of features, figures, steps, operations, structural elements, components, or combinations thereof described in the specification, without precluding the possibility of the presence or addition of one or more other features, figures, steps, operations, structural elements, components, or combinations thereof.

[0045] Furthermore, terms such as "first" and "second" should be understood as designations used only to distinguish between multiple features, figures, steps, operations, structural elements, components, or combinations thereof described in the specification. For example, "first structural element" and "second structural element" can be replaced with "second structural element" and "first structural element" in the description.

[0046] In this invention, "system", "module", "unit", "part", etc. may include computer-related software, hardware or a combination of software and hardware, or may be implemented by them.

[0047] In this invention, a first direction DR1, a second direction DR2, and a third direction DR3 may be defined. The first direction DR1 and the second direction DR2 are directions located on the same plane and orthogonal to each other, and the third direction DR3 is a direction perpendicular to the first direction DR1 and the second direction DR2 respectively.

[0048] Figure 1 This is a schematic perspective view of a display panel manufacturing system 1000 according to an embodiment of the present invention. Although Figure 1 The display panel manufacturing system 1000 is illustrated, but it is not limited to this and can also be applied to other types of panel manufacturing systems that require ink ejection. Figure 1 The display panel manufacturing system 1000 illustrated herein may include an ejection unit 100, a sensor unit 200, a worktable 300, and a control unit 400.

[0049] refer to Figure 1 The dispensing unit 100 may include a head unit 110 and a moving unit 120 for dispensing ink. The head unit 110 includes a nozzle for dispensing ink to the substrate SUB. The ink can be ejected in solution form through the nozzle to the pixels PX of the substrate SUB (see [link to relevant documentation]). Figure 3 ).

[0050] The moving unit 120 causes the head unit 110 to move relative to the substrate SUB. (Reference) Figure 1 The moving unit 120 can be configured to move the head unit 110. The moving unit 120 moves the head unit 110 in a first direction DR1, which is horizontal. At this time, the stage 300 moves the substrate SUB in a second direction DR2, which is perpendicular to the first direction DR1, which is the direction of movement of the head unit 110.

[0051] Furthermore, the moving unit 120 not only moves the head unit 110 in the first direction DR1, but also moves the head unit 110 in the second direction DR2, which is horizontal. Alternatively, the moving unit 120 moves the head unit 110 in the second direction DR2, and the worktable 300 moves the substrate SUB in the first direction DR1.

[0052] Although not illustrated in the figure, the moving unit 120 can also move in the third direction DR3 for the purpose of changing the height of the head unit 110 with the substrate SUB as a reference. Furthermore, the moving unit 120 can rotate for the purpose of tilting the head unit 110 with the substrate SUB as a reference. That is, the moving unit 120 can rotate about at least one of the first direction DR1 to the third direction DR3 as a rotation axis without fixing the head unit 110.

[0053] A base plate SUB and a worktable 300 may be provided below the head unit 110. Although not shown in the figure, when the head unit 110 and the moving unit 120 are fixed, the worktable 300 can also move linearly and rotate in a manner similar to the movement of the head unit 110 and the moving unit 120.

[0054] The sensor unit 200 measures distances or angles at desired locations, ink ejection areas, ink ejection errors, etc., in various ways. The sensor unit 200 can be composed of various sensors such as cameras and gyroscope sensors, or it can be a single sensor. The sensor unit 200 is combined with the head unit 110 to capture images of the substrate SUB located below the head unit 110. Figure 1The application of the position, type, and number of sensor units 200 is not limited to the position, type, and number of head units 110 shown in the accompanying drawings. For example, when the sensor unit 200 is a camera and is used to measure the ink dispensing area or ink dispensing error, the camera can be located near the head unit 110. Furthermore, when the sensor unit 200 uses other sensors (not shown) such as a gyroscope sensor besides a camera for measurement, the sensor unit 200 can be located near the head unit 110 or the worktable 300. Moreover, sensor units 200 can be arranged side-by-side in various locations.

[0055] The worktable 300 stably fixes the substrate SUB, thus achieving ink dispensing without shaking during the ink dispensing process. Figure 1 In this way, the worktable 300 is positioned relative to the head unit 110. Figure 1 The head unit 110 moves in the second direction DR2 as shown. At this time, the head unit 110 moves in the first direction DR1.

[0056] like Figure 1 As shown, the worktable 300 can be formed with an overall quadrilateral plane, allowing the substrate SUB to be placed on its upper surface. Furthermore, although not shown in the figure, the worktable 300 can be a single-, double-, or triple-layered (not shown) overlapping worktable 300. Of course, this worktable 300 structure can be configured in various ways, utilizing the structure of a fixed industrial printing press or combining it, depending on the implementation conditions. Depending on the complexity of the worktable 300 structure, the calculation of distance or angular error between the worktable 300 and the head unit 110 may become more important.

[0057] Next, the control unit 400 manages and calculates the overall operation of the display panel manufacturing system 1000 and performs control. The control unit 400 controls the display panel manufacturing system 1000 to calculate the error in the ink ejection position based on the movement of the head unit 110 or the worktable 300. The control unit 400 controls the display panel manufacturing system 1000 to manufacture the display panel by correcting the position of the head unit 110 or the worktable 300 using the calculated error and ejecting ink to the accurate position. Although not shown in the figure, the main functions of the control unit 400 may include operations related to control signal generation and information transmission, error calculation, error compensation calculation, and storage of calculation results and control signals.

[0058] The control unit 400 can first calculate errors or transmit information to or control the head unit 110, the moving unit 120, the sensor unit 200, and the worktable 300 to control ink dispensing during the manufacturing process of the display panel. The control unit 400 controls the moving unit 120, causing the head unit 110 to move in the first direction DR1. The control unit 400 controls the worktable 300, causing the substrate SUB to move in the second direction DR2. Furthermore, the control unit 400 can control the opening and closing of the ink nozzles of the head unit 110 to dispense ink onto the substrate SUB. Further, the control unit 400 can control various sensor units 200 used to capture images of the area where ink is dispensed.

[0059] The control unit 400 can receive measured position or angle information from the sensor unit 200. The operation of calculating the distance or angle error of the ink ejection position based on this information can be implemented by software. Various information received from the sensor unit 200 can be used to calculate pitch, roll, yaw, and other angles relative to the axes from the first direction DR1 to the third direction DR3. This calculation algorithm is generally used in position control of conventional aircraft or vehicles, and can omit specific explanations related to calculating the yaw angle relative to the axes from the first direction DR1 to the third direction DR3 from the measured values.

[0060] For calculation and error correction, the control unit 400 may include a processor, a memory, and a storage device. The sensor unit 200 may store the distance or angle result values ​​measured and calculated by the control unit 400. Then, in order to correct for distance or angle errors, the control unit 400 performs reference coordinate calculations.

[0061] Here, the reference coordinates refer to the coordinates set after linear correction, where the difference between the linearly corrected coordinates and the pixel coordinates does not exceed the allowable error. The reference coordinates are the position calculated using a measurement interval, an allowable error value, and a reference coordinate calculation algorithm. The allowable error is the degree to which defects caused by ink detachment from a pixel are visually identifiable; it is related to the device's resolution. The measurement interval is the movement interval used to measure errors while the head unit 110 moves at regular intervals. Based on the calculated reference coordinates, an algorithm for correcting errors is executed. To perform software operations such as calculations or algorithms, the control unit 400 uses a processor to run information about algorithms stored in memory. However, this is not a limitation; the aforementioned calculations or algorithms can be implemented using dedicated logic circuits, etc.

[0062] When performing ink dispensing operations, the control unit 400 can receive information related to the ink dispensing process, such as the start and end of ink dispensing, and execute the ink dispensing. Thus, the control unit 400 can automatically manage the ink dispensing equipment and run the required operations of the display panel manufacturing system 1000 step by step. Furthermore, the control unit 400 may include a display unit such as a monitor to display the received information or the results of calculations and computations.

[0063] Figure 2 This is a schematic plan view of the head unit 110 according to an embodiment of the present invention. (See reference) Figure 2 The head unit 110 may include a single head unit 111, and the single head unit 111 may include a nozzle NZ. The head unit 110 may be composed of multiple single head units 111. However, the structure of the single head unit 111 is not limited to... Figure 2 To dispense ink, the individual head unit 111 includes a plurality of nozzles NZ. The nozzles NZ dispense ink to the substrate SUB, and the nozzles NZ are arranged in the first direction DR1.

[0064] Figure 3 This is a plan view illustrating nozzles and pixels according to an embodiment of the present invention. For example, a color filter is a main structural element used to represent colors in a Liquid Crystal Display (LCD) panel. The pixel unit of the color filter consists of three sub-pixels: RGB. Typically, in an LCD, RGB has a checkerboard structure. RGB sub-pixels are formed by ejecting their respective pigments or pigmented inks from an inkjet printhead onto each sub-pixel. Furthermore, as an example, the ink can be provided in a solution or colloidal state. For example, the solvent can be acetone, water, alcohol, toluene, propylene glycol (PG), or propylene glycol methyl acetate (PGMA), etc., but is not limited to these.

[0065] refer to Figure 3 The head unit 110 can be located above the substrate SUB on the third-party DR3 and includes a single head unit 111 containing a nozzle NZ. Pixels PX are located on the substrate SUB and are arranged one by one below the nozzle NZ of the single head unit 111, so that each pixel PX corresponds to a nozzle NZ one-to-one. Furthermore, the pitch between the nozzles NZ and the pitch between the pixels PX can be the same. Although in Figure 3 The diagram illustrates the case where pixels PX are formed into rectangular shapes, but this is not a limitation; pixels PX can be formed into various shapes. Ink is filled into these pixels PX using inkjet printing.

[0066] Furthermore, the nozzle NZ can be configured such that the unit spray interval varies depending on the desired resolution, i.e., ppi (pixels per inch). At a resolution of 220 ppi, it has a spray structure that can form 220 pixels within 1 inch.

[0067] Figure 4 This is a plan view of the pitch, roll, and yaw attitudes of multiple nozzles NZ according to the movement direction of the head unit 110, according to an embodiment of the present invention. (See reference) Figure 4 Pitch is the rotation of the head unit 110 about an axis parallel to the second direction DR2, relative to the direction of movement of the head unit 110 in the first direction DR1. For example, multiple nozzles NZ may have pitch based on rotation about the second direction DR2. The control unit 400 can correct the error caused by pitch by deflecting the multiple nozzles NZ in the first direction DR1.

[0068] Roll is a rotation about an axis parallel to the first direction DR1 relative to the direction of movement in the first direction DR1. For example, multiple nozzles NZ may have roll parallel to the first direction DR1. The control unit 400 can correct the error caused by roll by deflecting the multiple nozzles NZ in the second direction DR2.

[0069] Yaw is rotation about an axis parallel to a third direction DR3 relative to the direction of movement in the first direction DR1. For example, multiple nozzles NZ may have yaw about an axis parallel to a third direction DR3 relative to the direction of movement in the first direction DR1. The control unit 400 can correct the error caused by yaw by rotating the multiple nozzles NZ with the third direction DR3 as a reference.

[0070] Figure 5 This is a planar diagram showing the nozzle NZ posture as a result of the pitch caused by the movement of the head unit 110, representing the amount of error in the ink ejected by the nozzle NZ. As an example, when the nozzle NZ moves at intervals in the first direction DR1 due to the movement of the head unit 110, a pitch can exist with reference to the rotation axis of the second direction DR2. This means that when ink is ejected from the nozzle NZ of the head unit 110, it is possible for the ejected droplets to have an error in the first direction DR1. (Reference) Figure 5 The error in the dispensed ink is ER1. To correct this error, the control unit 400 can calculate the error by using the average of the dispensing positions of the outermost nozzle NZ (the two end nozzles NZ) located in the first direction DR1.

[0071] Figure 6This is a planar diagram showing the nozzle NZ posture due to the offset caused by the movement of the head unit 110, representing the amount of error in the ink ejected by the nozzle NZ. As an example, when the nozzle NZ moves at intervals in the first direction DR1 due to the movement of the head unit 110, there may be a distance change caused by the additional offset in the first direction DR1. This means that when ink is ejected from the nozzle NZ of the head unit 110, the distance change caused by the offset in the first direction DR1 may cause errors in the ejected droplets. (Reference) Figure 6 The error in the dispensed ink is ER2. To correct this error, the control unit 400 can calculate the error by using the average of the dispensing positions of the outermost nozzle NZ (the two end nozzles NZ) located in the first direction DR1.

[0072] Figure 7 This is a planar diagram showing the nozzle NZ posture resulting from the roll caused by the movement of the head unit 110, representing the amount of error in the ink ejected by the nozzle NZ. As an example, when the nozzle NZ moves a certain distance in the first direction DR1 due to the movement of the head unit 110, a roll can occur with respect to a rotation axis parallel to the first direction DR1. This means that when ink is ejected from the nozzle NZ of the head unit 110, the roll may cause errors in the ejected droplets in the second direction DR2. (Reference) Figure 7 The error in the dispensed ink is ER3. To correct this error, the control unit 400 can calculate the error by using the average of the dispensing positions of the outermost nozzle NZ (the two end nozzles NZ) located in the second direction DR2.

[0073] Figure 8 This is a planar diagram showing the nozzle NZ posture as a result of the straightness of the distance the head unit 110 moves, representing the amount of ink ejected by the nozzle NZ. As an example, the nozzle NZ may exhibit straightness errors at intervals in the second direction DR2 along the first direction DR1 due to the movement of the head unit 110. This means that when ink is ejected from the nozzle NZ of the head unit 110, the change in the distance of the skewed straightness in the second direction DR2 may cause errors in the ejected droplets. (Reference) Figure 8 The error in the dispensed ink is ER4. To correct this error, the control unit 400 can calculate the error by using the average of the dispensing positions of the outermost nozzle NZ (the two end nozzles NZ) located in the second direction DR2.

[0074] Figure 9This is a planar diagram showing the nozzle NZ posture as a result of the yaw caused by the movement of the head unit 110, representing the amount of ink ejected by the nozzle NZ. As an example, when the nozzle NZ moves at intervals in the first direction DR1 due to the movement of the head unit 110, yaw may exist about the third direction DR3 as the axis of rotation. This means that when ink is ejected from the nozzle NZ of the head unit 110, the angle of the yaw caused by rotation about the third direction DR3 as the axis of rotation may cause errors in the ejected droplets. (Reference) Figure 9 The error in the dispensed ink is ER5. In the case of yaw, it can be calculated using the individual head units 111 at both ends of the head unit 110. To correct this error, the control unit 400 can calculate the error using the average of the dispensing positions of the outermost nozzles NZ (the nozzles NZ at both ends) located in the long side direction (first direction DR1) of the head unit 110.

[0075] Figure 10 This is a plan view showing the error in the first direction DR1 when the head unit 110 travels in the second direction DR2 (printing direction) as an example. To address the error, firstly, in order to confirm the distance error component of the axis while moving the head unit 110, it is necessary to eject ink from the head unit 110. Based on the ejection result, the control unit 400 finds the location of the reference coordinates and performs linear correction to measure the optimal nozzle position.

[0076] The reference coordinates are set such that the distance between the pixel position and the output position does not exceed the allowable error, which can be set according to the characteristics of the display panel. The allowable error can be set to various values ​​depending on the device. Here, the allowable error is limited to 1µm for explanation.

[0077] [Table 1]

[0078] As shown in Table 1 above, when the head unit 110 moves in the second direction DR2 at a distance of 200mm, the distance error of the head unit 110 in the first direction DR1 at every 200mm interval is confirmed as shown in Table 1. If the measured error coordinate value (which is the first direction DR1 coordinate (0, 2.5, 5.5, 7.5, 8, 7.5, 4, 0) corresponding to the second direction DR2 coordinate (0, 200, 400, 600, 800, 1000, 1200, 1400) of the head unit 110 movement) is confirmed, it can be confirmed that the error value in the display area of ​​the second direction DR2 coordinate (600, 800, 1000) is larger than the error value in other positions.

[0079] Next, the reference coordinates, when performing linear correction to correct errors, are defined as coordinates set such that the difference between the linearly corrected coordinates and the pixel coordinates does not exceed the allowable error. The reference coordinates are the position calculated using the measurement interval, the allowable error value, and the reference coordinate calculation algorithm. It is possible to calculate which position in the measured second-direction DR2 coordinates is the reference coordinate.

[0080] [Table 2]

[0081] Table 2 above illustrates how the reference coordinate position is calculated every 200mm interval when the head unit 110 travels in the second direction DR2 at measurement intervals of 200mm. To calculate the reference coordinate position, an average value is calculated for each measurement, i.e., a linear correction is performed on each measurement. The reference coordinate position can be calculated for each second direction DR2 coordinate (0, 200, 400, 600, 800, 1000, 1200, 1400).

[0082] The steps of setting multiple reference coordinates include: setting a first reference coordinate among multiple reference coordinates; obtaining the coordinates of the ejected ink; performing linear correction between the first reference coordinate and the obtained coordinate; determining whether the difference between the ejected ink coordinate and the linearly corrected coordinate between the first reference coordinate and the obtained coordinate exceeds the allowable error; and if the allowable error is exceeded, setting the coordinate of the ejected ink before the obtained coordinate as the second reference coordinate.

[0083] As an example, the first reference coordinate is set to an initial value of 0. It is then determined whether coordinate 200 is a reference coordinate. The distance error measured at coordinate 400 is 5.5, and the error measured at coordinate 0 (the first reference coordinate) is 0. For coordinate 200, the average of the error values ​​0 and 5.5 is calculated as 2.75. Next, at coordinate 0 (the first reference coordinate), the value is 0 (the result of subtracting the measurement error value 0 from the distance measurement error value 0), and at coordinate 200, the value is 0.25 (the result of subtracting 2.75 from the measurement error value 2.5). Here, to determine whether coordinate 200 is a reference coordinate, an allowable error is required. When the error difference is greater than or equal to the allowable error, the corresponding coordinate is determined as a reference coordinate. The allowable error used in the above embodiment can be set to 1µm. When the error difference is greater than or equal to the allowable error of 1µm, the corresponding coordinate is determined as a reference coordinate. Therefore, since the error difference of coordinate 200 is 0.25, which is within the allowable error of 1µm, coordinate 200 will not be selected as the reference coordinate.

[0084] Second, determine whether coordinate 400 is the reference coordinate. The measurement error value of coordinate 600 is 7.5, and the measurement error value of 0 is applied to coordinate 0 (the first reference coordinate). At coordinate 200, the linear average of the error value 0 and the error value 7.5 is 2.5. At coordinate 400, the linear average of the error value 0 and the error value 7.5 is 5. Next, at coordinate 200, the value 0 is calculated by subtracting the input measurement error value 2.5 from the measurement error value 2.5, and at coordinate 400, the value 0.5 is calculated by subtracting the calculated input value 5 from the measurement error value 5.5. To determine whether coordinate 400 is the reference coordinate, an allowable error is required. When the error difference is greater than the allowable error of 1µm, the corresponding coordinate is determined as the reference coordinate. Therefore, since the error difference of 0.5 at coordinate 400 is within the allowable error of 1µm, coordinate 400 will not be selected as the reference coordinate.

[0085] Third, determine whether coordinate 600 is the reference coordinate. The measurement error value of coordinate 800 is 8, and the measurement error value of 0 is applied to coordinate 0 (the first reference coordinate). At coordinate 400, it is the linear average of error value 0 and error value 8, which is 4. At coordinate 600, it is the linear average of error value 0 and error value 8, which is 6. Next, at coordinate 400, the value is 1.5, which is obtained by subtracting the input measurement error value 4 from the measurement error value 5.5. At coordinate 600, the value is 1.5, which is obtained by subtracting the calculated input value 6 from the measurement error value 7.5. At coordinate 800, the value is 0, which is obtained by subtracting the calculated input value 8 from the measurement error value 8. To determine whether coordinate 600 is the reference coordinate, an allowable error is required. When the error difference is greater than the allowable error of 1µm, the corresponding coordinate is determined to be the reference coordinate. Therefore, since the error difference of coordinate 600 is 1.5 greater than the allowable error of 1µm, and the error difference of coordinate 400 is 1.5 greater than the allowable error of 1µm, coordinate 600 is selected as the reference coordinate (second reference coordinate).

[0086] Fourth, determine whether coordinate 800 is the reference coordinate. The measurement error value of coordinate 1000 is 7.5, and the measurement error value of 7.5 is applied to the reference coordinate 600 (the second reference coordinate). At coordinate 800, the linear average of the error values ​​of 7.5 at coordinate 600 and 7.5 at coordinate 1000 is 7.5. Next, at coordinate 800, the value is 0.5, obtained by subtracting the input measurement error value of 7.5 from the measurement error value of 8.5, and at coordinate 600, the value is 0, obtained by subtracting the calculated input value of 7.5 from the measurement error value of 7.5. To determine whether coordinate 800 is the reference coordinate, an allowable error is required. When the error difference is greater than the allowable error of 1µm, the corresponding coordinate is determined as the reference coordinate. Therefore, since the error difference of 0.5 at coordinate 800 is within the allowable error of 1µm, coordinate 800 will not be selected as the reference coordinate.

[0087] Fifth, determine whether coordinate 1000 is the reference coordinate. The measurement error value of coordinate 1200 is 4, and the measurement error value of 7.5 is applied to the reference coordinate 600 (the second reference coordinate). At coordinate 800, the linear average of the error value 7.5 of coordinate 600 and the error value 4 of coordinate 1200 is 6.333. At coordinate 1000, the linear average of the error value 7.5 of coordinate 600 and the error value 4 of coordinate 1200 is 5.167. Next, at coordinate 1000, the value is 2.333, obtained by subtracting the input measurement error value 5.167 from the measurement error value 7.5; at coordinate 800, the value is 1.667, obtained by subtracting the calculated input value 6.333 from the measurement error value 8. To determine whether coordinate 800 is the reference coordinate, an allowable error is required. When the error difference is above the allowable error, the corresponding coordinate is determined as the reference coordinate. When the error difference is above the allowable error of 1µm, the corresponding coordinate is determined as the reference coordinate. Therefore, since the error difference of coordinate 1000 is 2.333, which is above the allowable error of 1µm, coordinate 1000 is selected as the reference coordinate.

[0088] [Table 3]

[0089] Error correction can be performed using the reference coordinates calculated in this way as a benchmark. As an example, this includes a step of performing linear correction (average) among multiple reference coordinates, wherein the difference between the coordinates of the head unit corresponding to the area where ink is ejected and the linearly corrected coordinates is set to be less than the allowable error.

[0090] Table 3 above shows the results of distance error correction calculations in the first direction DR1 using the reference information from the reference coordinates. The second direction DR2 coordinates (0, 200, 400, 600) represent the distance between the head and the first reference coordinate. This part is calculated using the average of 0 (the first reference coordinate) and 7.5 (the reference coordinate) through linear correction A. That is, the value (0, 2.5, 5, 7.5) is considered the error value after linear correction. Next, the second direction DR2 coordinates (600, 800, 1000) represent the distance between the reference coordinates. This part is calculated using the average of 7.5 (the reference coordinate) and 7.5 (the reference coordinate) through linear correction B. That is, the value (7.5, 7.5, 7.5) is considered the error value after linear correction. Finally, the second-direction DR2 coordinates (1000, 1200, 1400) represent the distance between the reference coordinates and the endpoint. Coordinate 1200 is calculated using the average of 7.5 (the value of coordinate 1000) and 0 (the value of coordinate 1400) through a linear correction C. That is, the value (7.5, 3.75, 0) can be considered as the error value after linear correction.

[0091] The calculated error compensation value is then compared with the measurement error. It is confirmed whether the compared value is within the allowable error. If not, the measurement interval of the nozzle NZ movement direction can be further reduced, and the above steps can be repeated. The allowable error used in the above embodiment is 1µm. Therefore, as shown in Table 3 above, if the measured error is compared with the calculated error, both are within 1µm, indicating that the error is well compensated within the allowable error. That is, it can be seen that the ink dispensing error of the control panel can be controlled by calculating the reference coordinate position based on the allowable error.

[0092] Figure 11 This is a plan view showing the error in the second direction DR2 when the head unit 110 travels in the first direction DR1 (vertical direction of printing travel) as an embodiment. To address the error, firstly, in order to confirm the distance error component of the axis while moving the head unit 110, it is necessary to eject ink from the head unit 110. The control unit 400 uses the ejection result to find the location of the reference coordinates and performs linear correction to measure the optimal nozzle position. Here, the allowable error is limited to 1µm for explanation.

[0093] [Table 4]

[0094] As shown in Table 4 above, when the head unit 110 moves in the first direction DR1 at 200mm intervals, the distance error of the head unit 110 in the second direction DR2 at every 200mm interval is confirmed as shown in Table 4. If the error coordinate values ​​of the second direction DR2 coordinates (0, 200, 400, 600, 800, 1000) of the head unit 110 are confirmed, it can be confirmed that the error value above coordinate 600 has a larger error value than the error value at other positions.

[0095] Next, the reference coordinates refer to the coordinates set so that, during linear correction to correct errors, the difference between the linearly corrected coordinates and the pixel coordinates does not exceed the allowable error. The reference coordinates are the position calculated using the measurement interval, the allowable error value, and the reference coordinate calculation algorithm. It is possible to calculate which position in the measured first direction DR1 coordinates is the reference coordinate.

[0096] [Table 5]

[0097] As shown in Table 5 above, when the head unit 110 travels in the first direction DR1 at measurement intervals of 200mm, the reference coordinate position is calculated every 200mm interval. To calculate the reference coordinate position, the average value of each measurement is calculated. The reference coordinate position can be calculated for each coordinate in the first direction DR1 (0, 200, 400, 600, 800, 1000).

[0098] To calculate the reference coordinate position, an average value is calculated for each measurement interval. The reference coordinate position can be calculated using the coordinate values ​​of each first direction DR1 coordinate (0, 200, 400, 600, 800, 1000).

[0099] The steps of setting multiple reference coordinates include: setting a first reference coordinate among multiple reference coordinates; obtaining the coordinates of the ejected ink; performing linear correction between the first reference coordinate and the obtained coordinate; determining whether the difference between the ejected ink coordinate and the linearly corrected coordinate between the first reference coordinate and the obtained coordinate exceeds the allowable error; and if the allowable error is exceeded, setting the coordinate of the ejected ink before the obtained coordinate as the second reference coordinate.

[0100] As an example, the first reference coordinate is set to an initial value of 0. Then, it is determined whether coordinate 200 is a reference coordinate. At coordinate 400, -3 (the measurement error value) is input, and at coordinate 0 (the first reference coordinate), the measurement error value 0 is input. At coordinate 200, -1.5 (the average of the error value 0 and the error value -3) is calculated. Next, at coordinate 0, 0 (the value obtained by subtracting the input measurement error value 0 from the measurement error value 0) is calculated, and at coordinate 200, 0.5 (the value obtained by subtracting the calculated input value -1.5 from the measurement error value -2) is input. To determine whether coordinate 200 is a reference coordinate, tolerance error information is required. When the error difference is greater than or equal to the tolerance error, the corresponding coordinate is determined as a reference coordinate. In the above embodiment, the tolerance error is set to 1µm. When the error difference is greater than or equal to the tolerance error of 1µm, the corresponding coordinate is determined as a reference coordinate. Therefore, since the error difference of 0.5 at coordinate 200 is within the tolerance error of 1µm, coordinate 200 will not be selected as a reference coordinate.

[0101] Second, the reference coordinates can be calculated using coordinate 400 in Table 5. To determine if coordinate 400 is a reference coordinate, input -4 (the measurement error value) at coordinate 600, and apply the measurement error value of 0 to coordinate 0 (the first reference coordinate). Calculate -2.66 (the linear average of error value 0 and error value -4) at coordinate 400. Calculate -1.33 (the linear average of error value 0 and error value -4) at coordinate 200. Next, calculate 0.67 (the value obtained by subtracting the input measurement error value -1.33 from the measurement error value -2) at coordinate 200, and input 0.34 (the value obtained by subtracting the calculated input value -2.66 from the measurement error value -3) at coordinate 400. To determine if coordinate 400 is a reference coordinate, allowable error information is needed. When the error difference is above the allowable error, the corresponding coordinate is determined as a reference coordinate. When the error difference is above the allowable error of 1µm, the corresponding coordinate is determined as a reference coordinate. Therefore, since the error difference of coordinate 400 is 0.34, which is within the allowable error of 1µm, coordinate 400 will not be selected as the reference coordinate.

[0102] Third, the reference coordinates can be calculated using coordinate 600 in Table 5. To determine if coordinate 600 is a reference coordinate, input -8.5 (the measurement error value) at coordinate 800, and apply the measurement error value of 0 to coordinate 0 (the first reference coordinate). Calculate -4.25 (the linear average of the error value 0 and the error value -8.5) at coordinate 400. Calculate -6.375 (the linear average of the error value 0 and the error value -8.5) at coordinate 600. Next, calculate 1.25 (the value obtained by subtracting the input measurement error value -4.25 from the measurement error value -3) at coordinate 400, and input 2.375 (the value obtained by subtracting the calculated input value -6.375 from the measurement error value -4) at coordinate 600. To determine if coordinate 600 is a reference coordinate, allowable error information is needed. When the error difference is above the allowable error, the corresponding coordinate is determined as a reference coordinate. When the error difference is above the allowable error of 1µm, the corresponding coordinate is determined as a reference coordinate. Therefore, since the error difference of coordinate 600 is 2.375, which is above the allowable error of 1µm, coordinate 600 is selected as the reference coordinate.

[0103] Fourth, the reference coordinates can be calculated using coordinate 800 in Table 5. To determine if coordinate 800 is a reference coordinate, input -12 (the measurement error value) at coordinate 1000, and apply the measurement error value -4 to the reference coordinate 600 (the second reference coordinate). Calculate -8 at coordinate 800, which is the linear average of the error values ​​-4 at coordinate 600 and -12 at coordinate 1000. Next, calculate 0.5 at coordinate 800, which is the result of subtracting the input measurement error value -8.5 from the measurement error value -8.5. Input 0 at coordinate 600, which is the result of subtracting the calculated input value -4 from the measurement error value -4. To determine if coordinate 800 is a reference coordinate, allowable error information is needed. When the error difference is above the allowable error, the corresponding coordinate is determined as a reference coordinate. When the error difference is above the allowable error of 1µm, the corresponding coordinate is determined as a reference coordinate. Therefore, since the error difference of coordinate 800 is 0.5, which is within the allowable error of 1µm, coordinate 800 will not be selected as the reference coordinate.

[0104] [Table 6]

[0105] Error correction can be performed using the reference coordinates calculated in this way as a benchmark. As an example, this includes a step of performing linear correction (average) among multiple reference coordinates, wherein the difference between the coordinates of the head unit corresponding to the area where ink is ejected and the linearly corrected coordinates is set to be less than the allowable error.

[0106] Table 6 above shows the results of the correction calculation for the second direction DR2 error using the reference information of the reference coordinates. The first direction DR1 coordinates (0, 200, 400, 600) are the distance between the head end and the first reference coordinate. This part is calculated using the average of the value of coordinate 0 (0) and the value of coordinate 600 (-4). This value (0, -1.33333, -2.66667, -4) is considered as the error value after linear correction A.

[0107] Next, the first direction DR1 coordinates (600, 800, 1000) represent the distance between the reference coordinates. This is calculated using the average of -4 (the value at coordinate 600) and -12 (the value at coordinate 1000). This value (-4, -8, -12) is considered the error value after linear correction B. The calculated error compensation value is then compared with the measurement error. The comparison value is checked to see if it is within the allowable error. If not, the measurement interval can be further reduced, and the above steps repeated. The allowable error is 1µm. Therefore, as shown in Table 6 above, if the measured error and the calculated error are compared, they are both within 1µm, indicating that the error is well compensated within the allowable error. That is, the ink ejection error of the control panel can be controlled by calculating the reference coordinate position based on the allowable error.

[0108] Figure 12 This is a flowchart of an ink ejection method according to an embodiment of the present invention. (See reference) Figure 12 This may include a step S100 of calculating and correcting errors and a step S200 of dispensing ink. Step S100 consists of a measurement and calculation step, a reference coordinate calculation step, an error correction step, and a final confirmation step. Details will be provided later. Figure 13 The following is a description. In step S200, the substrate SUB is fixed on the device, the position of the head unit 110 is set, and ink correction values ​​are applied to dispense ink. Details will be referred to later. Figure 13 and Figure 14 Describe it.

[0109] Figure 13 This is a flowchart of a reference coordinate calculation and error correction according to an embodiment of the present invention, which is equivalent to Figure 12 The step S100 involves calculating and correcting the error. This step can be divided into an error and measurement parameter setting step, an error measurement step, a reference coordinate calculation step, an error correction step, and a step to confirm whether the error is within the final allowable error range.

[0110] Step S110 is the step of setting the allowable error. This error will be used as a reference for judgment after calculating the reference coordinates and correcting the final error. Furthermore, step S110 is the step of setting the measurement interval of the substrate from which ink will be dispensed. To increase the number of reference coordinates, the substrate measurement interval can be set narrower.

[0111] In step S120, the error in the correction direction is measured. Step S120 is a step of calculating the error (distance or angle) in the correction direction by detecting the ink ejection error amount and the ink ejection coordinates. Distance or angle information can be acquired by various sensor units 200. The calculated values ​​of distance or angle error can be stored in the control unit 400 in matrix form.

[0112] Step S130 is the step of calculating the reference coordinates. To determine if the position of the middle part is the reference coordinate, the difference between the measured error value and the calculated value is checked to see if it is above the allowable error. If it is above the allowable error, the reference coordinate is determined. Specific details on calculating the reference coordinates have been referenced. Figure 10 and Figure 11 Please provide an explanation.

[0113] Step S140 is a step of performing linear correction (average) of the error based on the reference coordinates. The average value of the linearly corrected error is calculated among multiple reference coordinates from the first direction DR1 to the third direction DR3. At least one of the multiple reference coordinates may include a start coordinate and an end coordinate.

[0114] In step S150, it is confirmed whether the difference between the measured error of the front nozzle and the calculated error is within the allowable error range. If it is not within the allowable error range, the substrate measurement interval is reduced and the previous process is repeated.

[0115] Figure 14 This is a flowchart of an embodiment of the display panel manufacturing system of the present invention, which reflects error correction values ​​to eject ink, and is equivalent to... Figure 12 Step S200 involves the ink ejection process. In step S210, a worktable supports the substrate. In step S220, a head unit 110 is positioned above the substrate. In step S230, the head unit 110 is moved relative to the substrate based on an error correction value.

[0116] To use the linearly corrected error to dispense ink to accurate coordinates, alternative coordinates (or substitute coordinates) considering the correction direction are set. Here, substitute coordinates mean coordinates that compensate for the error calculated using linear correction in step S140 in the direction of cancellation (correction direction). As described above, linear correction makes the amount of movement of the head unit 110 in the correction direction constant (e.g., -2.5 μm per 200 mm up to 600 mm in Table 3, or 1.33 μm per 200 mm up to 600 mm in Table 3). The head unit 110 moves along the alternative coordinates, and with reference to the reference coordinates, changes the movement vector (the distance and direction of movement from the starting reference coordinate to the arriving reference coordinate) according to the amount of movement in the changed correction direction, so that the head unit 110 can move on a path without deviating from the allowable error. In step S240, the nozzle dispenses ink to the substrate. Step S240 is the step of dispensing ink to the pixel PX through the nozzle NZ of the head unit 110.

[0117] The embodiments illustrated above using specific numerical values ​​are merely examples. While described with reference to embodiments, it will be understood that those skilled in the art can modify and alter the invention in various ways without departing from the spirit and scope of the invention as set forth in the claims. Furthermore, the embodiments disclosed herein are not intended to limit the technical concept of the invention, and should be interpreted as including all technical concepts within the scope of the claims and their equivalents within the scope of the invention.

Claims

1. A display panel manufacturing system, comprising: The worktable is used to support the substrate; The head unit includes nozzles for dispensing ink to each pixel of the substrate; A moving unit is used to move the head unit relative to the substrate. The sensor unit acquires an image of the area where the head unit dispenses ink; as well as The control unit calculates the error in the correction direction between the ink ejection position and the pixel based on the image, and controls the relative movement of the head unit relative to the substrate based on the calculated error. The control unit sets multiple reference coordinates for correcting the calculated error. During the relative movement of the head unit between the multiple reference coordinates, the amount of movement of the head unit moving in the correction direction is controlled to be constant, and the movement vector of the head unit up to the reference coordinate and the movement vector of the head unit from the reference coordinate are controlled to be different from each other.

2. The display panel manufacturing system according to claim 1, wherein, The sensor unit is combined with the head unit to capture images of the substrate located below the head unit.

3. The display panel manufacturing system according to claim 1, wherein, The plurality of reference coordinates are a subset of the pixel coordinates used to measure the ink ejection position based on the image. The control unit replaces the remaining coordinates in the measured pixel coordinates based on the result of linearly correcting the errors between the plurality of reference coordinates.

4. The display panel manufacturing system according to claim 1, wherein, When the control unit performs linear correction between the plurality of reference coordinates, it sets the plurality of reference coordinates such that the difference between the coordinates of the head unit corresponding to the pixel and the linearly corrected coordinates is less than the allowable error.

5. The display panel manufacturing system according to claim 1, wherein, The control unit stores the plurality of reference coordinates before the manufacturing of the display panel, and controls the relative movement of the head unit relative to the substrate based on the stored plurality of reference coordinates during the manufacturing of the display panel.

6. The display panel manufacturing system according to claim 1, wherein, The plurality of reference coordinates are based on the direction of relative movement of the head unit and include the initial coordinates and final coordinates of the head unit.

7. An error correction method for a display panel manufacturing system, comprising the following steps: The head unit moves relative to the substrate while expelling ink onto the substrate; Acquire an image of the area where the head unit dispenses ink; The error in the correction direction between the ink ejection position and the pixels of the substrate is calculated based on the image. Multiple reference coordinates are set to correct the calculated error; as well as Linear correction is performed between the plurality of reference coordinates. The plurality of reference coordinates are set such that the difference between the coordinates of the head unit corresponding to the area where ink is extruded and the linearly corrected coordinates is less than the allowable error.

8. The error correction method for a display panel manufacturing system according to claim 7, wherein, The steps for setting the multiple reference coordinates include: Define the first reference coordinate among the plurality of reference coordinates; Obtain the coordinates of the ejected ink; A linear correction is performed between the first reference coordinates and the obtained coordinates; Determine whether the difference between the ink ejection coordinates and the linearly corrected coordinates between the first reference coordinates and the acquired coordinates exceeds the allowable error; and If the tolerance is exceeded, the coordinates of the ink ejected before the obtained coordinates will be set as the second reference coordinates.

9. The error correction method for a display panel manufacturing system according to claim 8, wherein, In the step of determining whether the allowable error is exceeded, if the allowable error is not exceeded, the error correction method of the display panel manufacturing system further includes the following steps: Obtain the coordinates of the next ink ejection; Perform linear correction between the acquired next coordinate and the first reference coordinate; and Determine whether the difference between the coordinates of the ink ejected and the linearly corrected coordinates between the first reference coordinates and the next obtained coordinates exceeds the allowable error.

10. A method for manufacturing a display panel, comprising the following steps: Support the substrate on the worktable; The head unit is positioned above the substrate; The head unit moves with a first movement vector and ejects ink until it reaches the reference coordinates; as well as The head unit moves from the reference coordinates with a second movement vector different from the first movement vector and ejects ink. When performing linear correction between the reference coordinates and the initial coordinates of the head unit, the reference coordinates are set such that the difference between the pixel coordinates of the ejected ink and the linearly corrected coordinates is less than the allowable error. When performing linear correction between the pixel coordinates of the ejected ink following the reference coordinates and the initial coordinates, the reference coordinates are set such that the difference between the pixel coordinates and the linearly corrected coordinates exceeds the allowable error.

Images