CN-122008694-A - Display panel manufacturing system, error correction method thereof and display panel manufacturing method

CN122008694ACN 122008694 ACN122008694 ACN 122008694ACN-122008694-A

Abstract

The invention relates to a display panel manufacturing system, an error correction method thereof and a display panel manufacturing method. The display panel manufacturing system includes a table, a head unit, a moving unit, a sensor section, and a control section. The stage supports a substrate. The head unit includes nozzles for ejecting ink to respective pixels of the substrate. The moving unit relatively moves the head unit with respect to the substrate. The sensor unit acquires an image of a region where the head unit discharges ink. The control unit calculates an error in the correction direction between the ink discharge position and the pixel based on the image and controls relative movement of the head unit with respect to the substrate based on the calculated error. The control unit sets a plurality of reference coordinates for correcting the calculated error, controls the movement amount 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, and controls the movement vector of the head unit up to the reference coordinates and the movement vector of the head unit from the reference coordinates to be different from each other.

Inventors

You Zhizhe
JIN DUHENG
An Xuangui
Zheng Cancheng
XU MINGZHU

Assignees

三星显示有限公司

Dates

Publication Date: 20260512
Application Date: 20251107
Priority Date: 20241111

Claims (10)

1. A display panel manufacturing system, comprising: a stage for supporting a substrate; a head unit including nozzles for ejecting ink to respective pixels of the substrate; a moving unit for relatively moving the head unit with respect to the substrate; A sensor unit for acquiring an image of an area from which the head unit discharges ink, and A control section that calculates an error in a correction direction between an ink discharge position and the pixel based on the image, and controls relative movement of the head unit with respect to the substrate based on the calculated error, The control section sets a plurality of reference coordinates for correcting the calculated error, controls a movement amount of the head unit moving in the correction direction to be constant during relative movement of the head unit between the plurality of reference coordinates, and controls a movement vector of the head unit up to the reference coordinates and a movement vector of the head unit from the reference coordinates to be different from each other.
2. The display panel manufacturing system according to claim 1, wherein, The sensor section is combined with the head unit and photographs the substrate located under the head unit.
3. The display panel manufacturing system according to claim 1, wherein, The plurality of reference coordinates are a part of pixel coordinates for measuring the ink discharge position based on the image, The control section substitutes the remaining coordinates among the measured pixel coordinates based on a result of linear correction of errors between the plurality of reference coordinates.
4. The display panel manufacturing system according to claim 1, wherein, The control section sets the plurality of reference coordinates such that a difference between the coordinates of the head unit corresponding to the pixel and the coordinates after the linear correction is smaller than an allowable error when the linear correction is performed between the plurality of reference coordinates.
5. The display panel manufacturing system according to claim 1, wherein, The control section stores the plurality of reference coordinates before manufacturing of a display panel, and controls the relative movement of the head unit with respect to the substrate based on the stored plurality of reference coordinates when manufacturing the display panel.
6. The display panel manufacturing system according to claim 1, wherein, The plurality of reference coordinates includes initial coordinates and final coordinates of the head unit with reference to a direction in which the head unit moves relatively.
7. An error correction method of a display panel manufacturing system, comprising the steps of: the head unit discharges ink to the substrate while relatively moving with respect to the substrate; acquiring an image of an area from which the head unit ejects ink; Calculating an error in a correction direction between an ink discharge position and a pixel of the substrate based on the image; Setting a plurality of reference coordinates for correcting the calculated error, and A linear correction is made between the plurality of reference coordinates, The plurality of reference coordinates are set so that a difference between the coordinates of the head unit corresponding to the region where the ink is discharged and the coordinates after the linear correction is smaller than an allowable error.
8. The error correction method of a display panel manufacturing system according to claim 7, wherein, The step of setting the plurality of reference coordinates includes: setting a first reference coordinate of the plurality of reference coordinates; Acquiring coordinates of the discharged ink; Performing linear correction between the first reference coordinates and the acquired coordinates; determining whether or not a difference between the coordinates of the discharged ink and the linearly corrected coordinates between the first reference coordinates and the acquired coordinates exceeds the allowable error, and When the allowable error is exceeded, the coordinates of the discharged ink before the acquired coordinates are set as second reference coordinates.
9. The error correction method of a display panel manufacturing system according to claim 8, wherein, In the step of judging whether the allowable error is exceeded, when the allowable error is not exceeded, the error correction method of the display panel manufacturing system further includes the steps of: Acquiring the coordinates of the next ink ejection; performing a linear correction between the next acquired coordinate and the first reference coordinate, and Determining whether a difference between the coordinates of the discharged ink and the coordinates corrected linearly between the first reference coordinate and the acquired next one exceeds the allowable error.
10. A display panel manufacturing method, comprising the steps of: supporting the substrate on a table; disposing a head unit above the substrate; moving the head unit by a first movement vector until reaching a reference coordinate and discharging ink, and Moving the head unit from the reference coordinates to a second movement vector different from the first movement vector and discharging ink, The reference coordinates are set such that a difference between pixel coordinates of the discharged ink and the coordinates after the linear correction is smaller than an allowable error when the linear correction is performed between the reference coordinates and initial coordinates of the head unit, The reference coordinates are set such that a difference between the pixel coordinates and the coordinates after the linear correction exceeds the allowable error when the linear correction is performed between the pixel coordinates of the discharged ink after the reference coordinates and the initial coordinates.

Description

Display panel manufacturing system, error correction method thereof and display panel manufacturing method Technical Field The present invention relates to a display panel manufacturing system and an error correction method thereof, and a display panel manufacturing method, and more particularly, to a display panel manufacturing system including a nozzle that discharges ink, an error correction method thereof, and a display panel manufacturing method. Background An inkjet printing apparatus as a display panel manufacturing system is a device used to discharge ink onto a substrate in a manufacturing process. Information on the ink discharge area is acquired by various sensor units, and the information is analyzed by software to correct errors. Finally, whether the corrected error is within the allowable error of the device is confirmed. In the manufacturing process of printed circuit boards, semiconductors, display panels, or the like, inkjet printing is mainly applied to discharge high-resolution ink in association with reliability of products. However, in practice, there is an error in the straightness of the shaft for moving the inkjet head and the angle at the time of movement, and therefore, the printing precision is degraded at a position where the error is large. As a result, the display color components may be difficult to print at high resolution. That is, there is a possibility that an error occurs due to the ink discharge from the pixel to which the ink should be applied. In this case, since a problem occurs in that the display panel becomes unusable, it is considered that it is necessary to perform error calculation and compensation not only for the basic distance of the nozzle but also for the angle. Disclosure of Invention The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a display panel manufacturing system and method for ejecting ink to an accurate position. Specifically, the present invention measures and calculates the error in the correction direction, calculates a plurality of reference coordinates, and performs error compensation with reference to the reference coordinates, thereby accurately ejecting ink. That is, the object is to manufacture a high resolution display panel. The display panel manufacturing system of the embodiment of the invention includes a table, a head unit, a moving unit, a sensor section, and a control section. The stage supports a substrate. The head unit includes nozzles for ejecting ink to respective pixels of the substrate. The moving unit relatively moves the head unit with respect to the substrate. The sensor unit acquires an image of a region where the head unit discharges ink. The control section calculates an error between the ink discharge position and the pixel in the correction direction based on the image, and controls relative movement of the head unit with respect to the substrate based on the calculated error. The control unit sets a plurality of reference coordinates for correcting the calculated error, controls the movement amount 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, and controls the movement vector of the head unit up to the reference coordinates and the movement vector of the head unit from the reference coordinates to be different from each other. As an example, the sensor section is combined with the head unit and photographs a substrate located under the head unit. As an example, the plurality of reference coordinates are part of pixel coordinates for measuring the ink discharge position based on the image, and the control section may replace the remaining coordinates among the measured pixel coordinates based on a result of linearly correcting an error between the plurality of reference coordinates. As an example, the control section may set the plurality of reference coordinates such that a difference between the coordinates of the head unit corresponding to the pixel and the coordinates after the linear correction is smaller than the allowable error when the linear correction is performed between the plurality of reference coordinates. As an example, the control part may store a plurality of reference coordinates before the manufacture of the display panel, and control the relative movement of the head unit with respect to the substrate based on the stored plurality of reference coordinates when the display panel is manufactured. As an example, the plurality of reference coordinates may be referenced to the direction of relative movement of the head unit, including initial coordinates and final coordinates of the head unit. As an example, the correction direction may be the same as the direction in which the head unit relatively moves, and the control section may calculate the error based on the position at which the ink is discharged by at