KR20140023752A - Polishing apparatus and method for flat display panel - Google Patents

Abstract

The present invention relates to a polishing apparatus and a polishing method for a display panel. The polishing apparatus for a display panel comprises: a table which transfers a panel in a Y-axis direction inside a polishing section; polishing stones which are placed both sides of the polishing section respectively in order to polish both corners of the panel; a first regulating unit which regulates the position of the polishing stone in a Z-axis direction; a measuring unit which measures the height of the bottom of the polishing stone in the lower area of the polishing stone and measures the height of the bottom of the panel in the lower area of the table; and a control unit which obtains the central height of the polishing stone and the central height of the panel from a previously stored thickness value of the polishing stone and a previously stored thickness value of the panel respectively through the measured height of the bottom of the polishing stone and the measured height of the bottom of the panel by the measuring unit, and regulates the position of the polishing stone in a Z-axis direction through the first regulating unit according to a compensation value by calculating the compensation value of the Z-axis direction position of the polishing stone in order to make the central height of the panel agree with the central height of the polishing stone.

Description

Display Panel Polishing Device and Polishing Method {POLISHING APPARATUS AND METHOD FOR FLAT DISPLAY PANEL}

The present invention relates to a polishing apparatus for a display panel and a polishing method, and more particularly, by measuring the center position of the corner portion of the panel to be polished in real time and correcting the center position of the abrasive stone according to the measured value, thereby minimizing polishing defects. The present invention relates to a polishing apparatus for a display panel and a polishing method that can prevent work interruption due to frequent maintenance.

In general, a flat panel display panel is cut to a required size. Since the edges of the cut portions are sharp and vulnerable to cracks, the edges of the flat panel display panels are polished round using a polishing machine using abrasive stones.

In order to perform round grinding, the polished panel is visually inspected, or the state and amount of polishing are checked through a microscope and a series of corrections are made.

To enable round chamfering, it is necessary to use the height at which the abrasive stone polishes, the depth entering the edge to be polished, and the angle of the polishing table. However, due to factors such as replacement of the abrasive stone according to the distance used, static electricity attached to the polishing table to prevent static electricity during polishing, and assembly state of the polishing table, the height of the polishing stone and Since the height is different, the quality of round grinding is degraded.

Among the correction methods of the polished stone, there is a height correction method, which can be linearly corrected, but it takes a long time to perform the height correction through the microscope, and it is nonlinear (when only a specific section differs from the polished section). If the height is different, the height correction method is limited.

In addition, because the abrasive stone is abnormally worn on the top and bottom surfaces, the abrasive stone is replaced with a single diameter and the abrasive stone is not filled to a certain distance, so the demand for the abrasive stone is increased, and the height must be corrected with the replacement of the abrasive stone. There is a delay.

Accordingly, an object of the present invention is to solve such a conventional problem, by real-time measuring the center position of the corner portion of the panel to be polished, by correcting the center position of the abrasive stone in accordance with the measured value, to minimize the polishing failure In addition, the present invention provides a polishing apparatus and a polishing method for a display panel that can prevent the interruption of work due to frequent maintenance.

According to the present invention, there is provided a polishing apparatus for a display panel, comprising: a table for transferring a panel in the Y-axis direction within a polishing section, and polished stones arranged at both sides of the polishing section to polish both edges of the panel. And, the first adjusting unit for adjusting the position of the abrasive stone in the Z-axis direction; And, Measuring unit for measuring the height of the bottom surface of the abrasive stone in the lower region of the abrasive stone, the measuring unit for measuring the height of the panel bottom portion in the lower region of the table ; And obtaining the center height of the abrasive stone and the center height of the panel from the thickness value of the abrasive stone and the thickness value of the panel, which are previously stored through the height of the abrasive stone bottom portion and the panel bottom portion measured by the measuring unit, respectively. And a control unit for calculating the Z-axis position correction value of the abrasive stone to match the center height of the abrasive stone to adjust the position of the abrasive stone in the Z-axis direction through the first adjusting unit according to the correction value. Achieved by a polishing apparatus.

Here, the control unit measures the height of the panel bottom portion in real time during the polishing process, and when the panel center height calculated by the height of the panel bottom portion measured in real time is different from the center of the abrasive stone, the polishing stops, the first control unit It is preferable to adjust the abrasive stone in the Z-axis direction to match the center height of the abrasive stone with the panel center height, and then proceed with polishing.

The measuring unit may further include a second adjusting unit which adjusts the position of the measuring unit in the X and Y axis directions so as to be selectively positioned in the lower region of the abrasive stone or the lower region of the panel.

In addition, the height measurement of the bottom of the abrasive stone is to measure the height of the abrasive stone bottom portion by moving the measurement unit to the lower portion of the abrasive stone through the second control unit when replacing the abrasive stone, and to move to the bottom region of the panel to measure the height of the panel bottom portion in real time. desirable.

In addition, the abrasive stone is provided with a plurality of vertically stacked configuration, it is preferable that any one of the abrasive stone for polishing the panel of the plurality of abrasive stones by the Z-axis position adjustment of the first control unit is selected.

In the process of acquiring the center position of the abrasive stone, the controller may acquire the center value of the abrasive stone, which is polished from the height of the bottom of the abrasive stone in consideration of the number of stacked stages of the abrasive stone.

In addition, the abrasive stone is preferably formed in the center of the outer circumferential groove for polishing the edge of the panel, both sides of the groove is formed with the inclined surface symmetrical mutually.

In addition, the measuring unit is preferably made of a laser displacement meter.

On the other hand, the above object, in the display panel polishing method, the step of seating the panel on the table; and measuring the height of the abrasive stone bottom portion from the reference surface, the abrasive stone center height through the measured abrasive stone bottom portion height and the pre-stored abrasive stone thickness value And calculating a panel bottom portion height from the reference surface, and calculating a panel center height based on the measured panel bottom portion height and a pre-stored panel thickness value; and comparing the panel center height and the abrasive stone center height. And adjusting the height of the abrasive stone by the height difference when the panel center height is different from the abrasive stone center height. And polishing the edges of the panel using abrasive stones when the panel center height is the same as the center height of the abrasive stone.

Here, after the polishing step, by repeatedly performing the panel center height calculation step to polishing step until the panel reaches the end point of polishing, it is preferable to make the height adjustment of the abrasive stone in real time with respect to the panel center position.

In addition, the grinding stone center height calculation step is preferably performed only at the first grinding of the abrasive stone.

In addition, it is preferable to perform the step of moving the table to the start position, and the step of confirming the start position of the polishing section when the table is not the starting position prior to the center height calculating step.

In the polishing step, the abrasive stone is moved in the X-axis direction so that the abrasive stone contacts the side surface of the panel, and the side edges of the panel are polished using the rotating abrasive stone.

In addition, it is preferable that the abrasive stone is spaced from the panel by moving the abrasive stone in the X-axis direction before performing the correction step.

According to the present invention, by measuring the center position of the corner portion of the panel to be polished in real time, and by correcting the center position of the abrasive stone according to the measured value, it is possible to minimize the polishing failure and at the same time prevent work interruption due to frequent maintenance A polishing apparatus and a polishing method for a display panel are provided.

In addition, a plurality of abrasives are laminated, and the specifications of the abrasives are stored in advance to calculate the center value of the abrasives in the initial installation state, and then the Z-axis correction value is calculated through the standard values stored in the process of adjusting the number of stages of the abrasives. Thereby, a polishing apparatus for a display panel and a polishing method are provided in which the height of the abrasive stone does not need to be measured separately in the process of using the abrasive stone.

1 is a perspective view of an apparatus for polishing a display panel of the present invention;
2 is a schematic front view of the polishing apparatus for a display panel of the present invention;
3 is a conceptual diagram for calculating the position of the center of the panel and the center of the abrasive stone of the polishing apparatus for a display panel of the present invention,
4 is a flowchart of a polishing method for a display panel of the present invention.

Hereinafter, a polishing apparatus for display panel P according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of the polishing apparatus for display panel P of the present invention, FIG. 2 is a schematic front view of the polishing apparatus for display panel P of the present invention, and FIG. 3 is a display panel P of the present invention. It is a conceptual diagram for calculating the position of the center of the panel P and the center of the grinding | polishing stone 130 of the grinding | polishing apparatus.

As shown in the drawings, the polishing apparatus for the display panel P of the present invention includes a table 120, a polished stone 130, a first adjusting unit 140, a measuring unit 150, a second adjusting unit 160, It is configured to include a control unit 170.

The table 120 fixedly supports the panel P in the same manner as the adsorption, and reciprocates the starting point and the ending point of the polishing section on the base 110 by the driving means (not shown) in the Y-axis direction.

The abrasive stone 130 is formed in the center of the outer circumferential surface roughly "V" shaped groove 131 is formed in the direction symmetrical to the upper and lower sides of the groove 131, respectively, the upper side and the lower side of the panel (P) By simultaneously polishing the edges, the edges are arranged on both sides of the polishing section. The abrasive stone 130 is stacked in the vertical direction, the abrasive stone 130 of any of the plurality of stacked abrasive stones (130a, 130b, 130c) is configured to selectively polish the panel (P).

The first adjustment unit 140 is to adjust the position of the abrasive stone 130 in the X, Z-axis direction, the X-axis driving unit 141 is disposed in the X-axis direction to drive in the forward and reverse directions, the X-axis drive unit The first moving body 142 sliding in the X-axis direction by the driving of the 141, the Z-axis driving unit 143 installed in the Z-axis direction on the first moving body 142 to drive in the forward and reverse directions, the Z And a second movable member 144 sliding in the Z-axis direction by the driving of the shaft driver 143, and the abrasive stone 130 is fixed to the second movable member 144 to be installed in the X-axis driving unit 141 and the Z-axis. By the drive of the drive part 143, it moves to the X-axis and Z-axis direction.

The measurement unit 150 is a laser displacement meter to measure the distance to the object, the lower region of the abrasive stone 130 measures the height of the bottom surface of the abrasive stone 130, the panel in the lower region of the table 120 (P) Measure the bottom part height.

The second adjustment unit 160 is X, Y axis position of the measurement unit 150 to selectively position the measurement unit 150 in the lower region of the abrasive stone 130 and the lower region of the panel (P) Direction by adjusting the direction, the X-axis drive unit 161 disposed in the X-axis direction and driven in the forward and reverse directions by the drive of the X-axis drive unit 163, the X-axis drive unit 161 and the X-axis drive unit 163 Y-axis driving unit 163 installed in the Y-axis direction on the third movable body 162 and the third movable body 164 sliding in the direction, and being driven in the Y-axis direction on the third movable body 162 and the third movable body 164. A fourth moving body 164 and a fourth moving body 162 sliding in the Y-axis direction by the driving of the Y-axis driving unit 161, the Y-axis driving unit 163, and the Y-axis driving unit 161, and the detection unit includes: Four movable body 164 is fixed to the fourth movable body 162.

On the other hand, the first adjusting unit 140 and the second adjusting unit 160 may be configured by combining a linear actuator such as a ball screw, a ball nut, a linear motor, and the like, although not shown in the drawing the first adjustment A guide such as an LM guide may be installed in parallel with the moving direction for the stable movement of the unit 140 and the second adjusting unit 160.

The control unit 170 is based on the thickness value of the polished stone 130 and the thickness value of the panel P stored in advance through the height of the bottom surface portion of the abrasive stone 130 and the height of the bottom surface portion of the panel P measured by the measuring unit 150. Z-axis position correction value of the abrasive stone 130 for acquiring the center height of the abrasive stone 130 and the center height of the panel P, respectively, and matching the center height of the panel P with the center height of the abrasive stone 130. By adjusting the position of the abrasive stone 130 in the Z-axis direction through the first adjustment unit 140 according to the correction value, and measures the height of the bottom portion of the panel P in real time during the polishing process, and measured in real time When the center height of the panel P calculated by the height of the bottom portion of the panel P is different from the center height of the abrasive stone 130, the polishing is stopped, and the abrasive stone 130 is moved along the Z axis through the first adjustment part 140. Direction to adjust the center height of the abrasive stone 130 to the center height of the panel P, and then Go ahead. In addition, in the process of acquiring the center position of the abrasive stone 130, when the abrasive stone 130 is provided with a plurality of laminated configuration, the bottom surface of the abrasive stone 130 in consideration of the number of stages of the plurality of stacked abrasive stone 130 It is to obtain the center value of the abrasive stone 130 to perform the polishing from the sub-height.

That is, as shown in FIG. 3, in the state where the measuring unit 150 is disposed in the lower region of the panel P by the second adjusting unit 160, the height between the measuring unit 150 and the bottom of the panel P ( d) is measured, and the height a between the measurement unit 150 and the bottom surface of the abrasive stone 130 is measured in the state of being disposed in the lower region of the abrasive stone 130. At this time, the controller 170 calculates the center position of the panel P by adding the t / 2 value, which is half of the thickness t value of the panel P stored in advance, to the bottom height d of the panel P, Among the specifications of the pre-stored abrasive stone 130, the height (b) between the bottom of the lowest abrasive stone 130 and the center of the abrasive stone 130 is added to the bottom height (a) of the abrasive stone 130 to determine the center position of the abrasive stone 130. Calculate.

On the other hand, when the panel P is polished using the abrasive stone 130 composed of a plurality of stages, the center value of any one of the abrasive stones 130a, 130b, 130c selected from the plurality of stacked layers is selected. Multiply the height of the unit abrasive stone 130 by the value of minus one in the corresponding stacked stage n of the abrasive stone 130, and then, the bottom height (a) of the abrasive stone 130 and the center height of the lowest abrasive stone 130 (b) Calculate the sum of the values.

The operation of the first embodiment of the polishing apparatus for display panel P described above and the display panel P polishing method will now be described.

1 and 2, according to the polishing apparatus for the display panel P of the present invention, the table 120 is disposed on the base 110 so as to be movable in the Y-axis direction, and the abrasive stone 130 is a substrate. Are disposed on both sides of the polishing section. The abrasive stone 130 is positioned in the X and Z-axis directions by the first adjusting unit 140, and may selectively contact the side surface of the substrate by the X-axis movement, and the abrasive stone 130 may be moved by the Z-axis movement. The position can be adjusted so that the center coincides with the center of the substrate.

The measuring unit 150 is disposed at both sides of the starting position of the polishing section of the substrate, and the X and Y are controlled by the second adjusting unit 160 to measure the height of the bottom surface of the abrasive stone 130 and the panel P, respectively. The position is adjusted in the axial direction, and unless a separate event occurs, the measuring unit 150 is set to be positioned in the lower region of the panel P.

Hereinafter, a polishing method for the display panel P of the present invention will be described with reference to FIG. 4.

4 is a flowchart of the polishing method for the display panel P of the present invention.

As shown in FIG. 4, the panel P is seated on the table 120 (S10), and fixedly supported by a method such as adsorption.

In the case of initial polishing, the measuring unit 150 is moved to the lower region of the abrasive stone 130 by adjusting the position of the measuring unit 150 in the X and Y-axis directions using the second adjusting unit 160 (S12), and using the measuring unit 150. (130) The bottom height is measured and the center height of the abrasive stone 130 is calculated through the size of the pre-stored abrasive stone 130 (S13), and the measurement unit 150 is connected to the panel P using the second adjusting unit 160. After moving to the lower region of S14, the table 120 is moved to the starting position of the polishing section (S15). As described above, the center height of the abrasive stone 130 is multiplied by a value obtained by subtracting 1 from the corresponding stacked stage n of the selected abrasive stone 130 and the height c of the unit abrasive stone 130, and then bottom surface of the abrasive stone 130. The height a and the center height b of the lowest abrasive stone 130 are added together and calculated.

On the other hand, in the case of not the initial polishing of the abrasive stone 130, the step S12 to S15 is omitted and immediately move the table 120 to the start position of the polishing section (S15). Here, since the abrasive stone 130 can calculate the center position of each unit abrasive stone 130 according to the pre-stored standard value after measuring the height of the bottom surface in the initial installation state, the bottom surface after the initial installation of the abrasive stone 130 After measuring the height, it is not necessary to measure the height until the replacement of the abrasive stone 130.

In the state where the table 120 is moved to the start position of the polishing section, the polishing start position of the table 120 is checked (S16), and in the case of the polishing start position, the measuring unit 150 is used to measure the bottom portion of the bottom surface of the panel P. The height is measured to calculate the center height of the panel P (S17). Here, the center height of the panel P is calculated by adding t / 2, which is half of the thickness t value of the panel P stored in advance, to the bottom height d of the panel P.

When the center height of the abrasive stone 130 and the center height of the panel P are calculated as described above, the panel P is compared with the center height of the center of the abrasive stone 130 (S178), and the center of the panel P is determined. If the height and the center height of the abrasive stone 130 are different, the abrasive stone 130 is moved to the X-axis direction by moving the position of the abrasive stone 130 through the X-axis driving unit 141 of the first adjusting unit 140 to the panel P (P). In the state spaced apart from the), calculates the correction value according to the height difference (S189), and adjusts the Z-axis position of the abrasive stone 130 using the first adjustment unit 140 in accordance with the correction value (S1920) After returning to step S17, the calibration operation for matching the center height of the abrasive stone 130 with respect to the center height of the panel P is repeatedly performed to match the center height of the abrasive stone 130 with respect to the center height of the panel P.

When the center height of the panel P and the center height of the abrasive stone 130 are the same, the X-axis driving part 141 of the first adjustment part 140 may contact the side surface of the panel P with the recess 131 of the abrasive stone 130. When the position of the abrasive stone 130 is moved in the X-axis direction through the abrasive stone 130, the upper and lower edges of the side surface of the panel P are simultaneously polished (S21). The edge of (P) is polished (S21).

In the process of performing the polishing step (S21), it is checked whether the table 120 has reached the end position in the polishing section (S22), and if the table 120 does not reach the end position, again S17 Returning to the step, the correction is performed to match the center position of the panel P with the center position of the abrasive stone 130, so that the center position of the panel P and the center position of the abrasive stone 130 are matched in real time during the polishing process.

On the other hand, when the table 120 reaches the end position in the polishing section, the measurement of the measuring unit 150 is terminated, and the atmosphere (S23) in the lower area of the panel P until the next panel P is supplied. do.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

110: base, 120: table, 130: polishing stone, 131: groove, 140: first adjustment unit,
141: X-axis drive unit, 142: first moving body, 143: Z-axis driving unit, 144: second moving body,
150: measuring unit, 160: second adjusting unit, 161: Y-axis driving unit, 162: fourth moving body,
1613: X-axis drive unit, 1624: third moving body,
163: Y-axis drive unit, 164: fourth moving body, 170: control unit, P: panel

Claims (14)

In the polishing apparatus for a display panel,
A table for transferring the panel in the Y-axis direction within the polishing section;
Abrasive stones disposed at both sides of the polishing section to polish both edges of the panel;
A first adjusting unit adjusting the position of the abrasive stone in the Z-axis direction;
A measuring unit measuring a height of the bottom surface of the abrasive stone in the lower region of the abrasive stone and measuring a height of the bottom surface of the panel in the lower region of the table;
The center height of the abrasive stone and the center height of the panel are obtained from the thickness values of the abrasive stone and the thickness of the panel, which are stored in advance through the abrasive stone bottom height and the panel bottom height measured by the measuring unit, respectively. And a control unit for calculating a Z-axis position correction value of the abrasive stone to match the center height, and adjusting the position of the abrasive stone in the Z-axis direction through the first adjusting unit according to the correction value. . The method of claim 1,
The controller measures the height of the panel bottom part in real time during the polishing process, and when the panel center height calculated by the panel bottom part height measured in real time is different from the center of the abrasive stone, polishing is stopped and the abrasive stone is made through the first adjusting part. To adjust in the Z-axis direction to match the center height of the abrasive stone to the center height of the panel, and then polish the display panel. 3. The method of claim 2,
And a second adjusting unit which adjusts the position of the measuring unit in the X and Y-axis directions so that the measuring unit is selectively positioned in the lower region of the abrasive stone or the lower region of the panel. The method of claim 3, wherein
The height measurement of the bottom of the abrasive stone is characterized by moving the measurement unit to the lower region of the abrasive stone through the second control unit when replacing the abrasive stone to measure the height of the abrasive stone bottom portion, and moves to the lower region of the panel to measure the height of the panel bottom portion in real time. Polishing apparatus for display panel. 5. The method of claim 4,
A plurality of abrasive stones are provided in a vertical stacking configuration, the polishing device for a display panel, characterized in that any one of the abrasive stones for polishing the panel of the plurality of abrasive stones by the Z position adjustment of the first control unit is selected. 6. The method of claim 5,
And the control unit obtains the center value of the abrasive stone for performing polishing from the bottom of the abrasive stone surface in consideration of the number of stacked stages of the abrasive stone in the process of acquiring the center position of the abrasive stone. The method according to claim 6,
The abrasive stone is formed in the center of the outer peripheral surface grooves for polishing the edge of the panel is formed, both sides of the grooves is characterized in that the inclined surface symmetrical mutually formed display device. 8. The method of claim 7,
The measuring unit polishing apparatus for a display panel, characterized in that consisting of a laser displacement meter. In the display panel polishing method,
Mounting a panel on the table (S10);
Measuring the height of the abrasive stone bottom portion from the reference surface and calculating the abrasive stone center height based on the measured abrasive stone bottom portion height and the pre-stored abrasive stone thickness value (S13);
Measuring a panel bottom height from the reference plane and calculating a panel center height based on the measured panel bottom height and a pre-stored panel thickness value (S17);
Comparing the panel center height with the abrasive stone center height (S18);
Calculating a correction value according to the height difference when the panel center height is different from the center of the abrasive stone (S19), and adjusting the Z-axis position of the abrasive stone according to the correction value (S20);
And polishing the edges of the panel using abrasive stones when the panel center height is equal to the abrasive stone center height (S21). The method of claim 9,
After the polishing step (S21), by repeatedly performing the panel center height calculation step (S17) to polishing step (S21) until the panel reaches the end point of polishing, the height adjustment of the abrasive stone is made in real time with respect to the panel center position Polishing method for a display panel, characterized in that The method of claim 10,
The grinding stone center height calculating step (S13) is performed only at the first grinding of the grinding stone. 12. The method of claim 11,
If the step is not the start position prior to the step of calculating the center height of the panel for moving the table to the start position (S16), and the table to determine the starting position of the grinding section (S17) for the display panel Polishing method. 13. The method of claim 12,
The polishing step (S21) is a polishing method for a display panel, characterized in that the grinding stone is moved in the X-axis direction so that the abrasive stone in contact with the side of the panel, using the rotating abrasive stone to polish the side edge of the panel. 14. The method of claim 13,
A polishing method for a display panel, characterized in that the abrasive stone is spaced apart from the panel by moving the abrasive stone in the X-axis direction before performing the correction value (S19).

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