JP2007261135A - Screen printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen printing method which can make favorable plate separation at screen printing in a process for manufacturing a displaying panel, and can obtain an excellent printing result with no color omission and no color deviation. <P>SOLUTION: In a screen printing method for performing printing on a substrate 7 using a rectangular frame-like printing pattern 4 formed on a screen printing plate 1 as an opening, the printing is performed by making a layout so that one corner among four corners of the printing pattern 4 becomes the end of the printing pattern 4 in the scanning direction of a squeegee 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a screen printing method, and more particularly to a screen printing method for printing a rectangular frame-like print pattern such as a black mask or a peripheral seal on a substrate.

  Screen printing is a type of stencil printing that uses an opening of a screen plate, and can be printed not only on paper but also on materials such as glass and plastic. Is employed (see Patent Document 1). As a typical example, a rectangular frame-shaped black mask is formed on a transparent substrate constituting a display panel.

  Here, the screen printing mechanism will be briefly described. First, a screen made of a fiber such as nylon or tetron or a stainless steel wire is stretched, and a desired printing pattern is formed as an opening on the screen. To create a screen version.

  Next, the work and the screen plate are overlapped with an appropriate clearance, and paste-like ink is placed on the surface of the screen. Then, an appropriate pressure is applied to the spatula-like squeegee, and the ink is moved while being pressed against the opening of the print pattern. At this time, the ink is filled in the opening of the printing pattern, and then the screen released from the squeegee is released from the work (separation), and at the same time, the ink passes from the opening of the printing pattern to the back side of the screen plate. Extruded onto the workpiece and desired printing is performed.

  As described above, since screen printing is performed by a plate separation mechanism, the quality of the plate separation determines the quality of the printing result.

JP-A-11-67073

  Here, the conventional problems in the case of forming a rectangular frame-shaped black mask disposed in the non-display area of the display panel on the transparent substrate constituting the display panel by the screen printing will be described with reference to FIGS. 10 will be used for explanation.

  FIG. 6 is a schematic diagram showing a layout relationship between the printing pattern 4 formed on the screen plate 1 and the scanning direction of the squeegee 6 in the conventional screen printing method.

  As shown in this figure, the conventional screen plate 1 has a printing pattern 4 formed of a rectangular frame-shaped opening, which is the shape of the black mask 8, formed at the center of the screen 3 extended in the frame 2. Yes. The screen plate 1 is laid out so that a pair of sides constituting the rectangular frame-shaped opening of the print pattern 4 is orthogonal to the scanning direction of the squeegee 6.

  The squeegee 6 is a spatula-shaped member made of a rubber material. As shown in FIG. 7, the squeegee 6 inclines the upper end side in the scanning direction, and supplies paste-like black ink supplied from a supply device (not shown). Is printed on the substrate 7 as a workpiece by scanning once in one direction while rubbing against the surface of the screen 3.

  When the squeegee 6 is scanned under the layout relationship between the printed pattern 4 and the scanning direction of the squeegee 6, a pair of side portions extending in parallel with the scanning direction of the squeegee 6, With a pair of side portions extending perpendicular to the scanning direction, as shown in FIG. 8 which is a VIII-VIII cross-sectional view of FIG. 6 and FIG. 9 which is a IX-IX cross-sectional view of FIG. In addition, there was a large difference in the area where the squeegee 6 to be scanned simultaneously contacts (hereinafter referred to as the simultaneous contact area). For example, when the squeegee 6 is located on the VIII-VIII line in FIG. 6 and when the squeegee 6 is located on the IX-IX line in FIG. 6, when the squeegee 6 is located on the IX-IX line in FIG. That is, the simultaneous contact area becomes larger when the squeegee 6 is located on the side extending perpendicular to the scanning direction of the squeegee 6. Then, when the squeegee 6 is scanned from the opening as the printing pattern 4 onto the screen 3 outside the opening and the contact is shifted, the tension applied to the screen plate 1 changes abruptly. As a result, the separation of the plate becomes poor. As a result, as shown in FIG. 10, there is a problem that unevenness occurs in the printing result, and a portion transparent to the black mask 8 occurs (color loss).

  Accordingly, the object of the present invention is to provide a screen printing method capable of improving plate separation at the time of screen printing in a manufacturing process of a display panel and obtaining an excellent printing result without color loss or unevenness. is there.

  In order to achieve the above-described object, the screen printing method of the present invention is the screen printing method for performing printing on a substrate using a rectangular frame-shaped printing pattern formed as an opening in a screen plate. Printing is performed by performing layout so that one of the four corners of the pattern is the end point of the print pattern in the scanning direction of the squeegee.

  According to the screen printing method of the present invention, the squeegee prints from one corner located upstream in the scanning direction with respect to a rectangular frame-shaped print pattern formed as an opening on the screen of the screen plate. The printing starts and ends at a corner located on the downstream side in the scanning direction of the squeegee, which is arranged diagonally with the one corner. In this way, the layout where the contact between the squeegee and the printed pattern formed on the screen plate starts at the point and ends at the point, more specifically, the final contact with the printed pattern on the screen plate of the squeegee. By reducing the contact area, a rapid change in tension applied to the screen plate can be eliminated, and the plate can be separated well. Further, by laying out as described above, the simultaneous contact area of the squeegee with respect to the print pattern can be averaged.

  In the screen printing method, for example, a rectangular screen plate having a pair of sides extending in parallel with the scanning direction of the squeegee, the pair of sides is inclined with respect to the scanning direction of the squeegee. In this way, it can be executed by performing the layout.

  The inclination angle of the pair of sides and the squeegee with respect to the scanning direction is preferably 30 ° to 60 °. By using such an inclination angle, the simultaneous contact area of the squeegee can be further averaged and uniform printing can be performed.

  As described above, according to the screen printing method of the present invention, it is possible to improve the plate separation during screen printing in the manufacturing process of the display panel, and to obtain an excellent printing result without color loss or unevenness.

  The screen printing method according to the present embodiment is a printing method employed for forming a rectangular frame-shaped black mask disposed in a non-display area of a display panel on a transparent substrate constituting the display panel.

  Hereinafter, this embodiment will be described with reference to FIGS. 1 to 5.

  FIG. 1 is a schematic diagram showing a layout relationship between the printing pattern 4 formed on the screen plate 1 used in the screen printing method of the present embodiment and the scanning direction of the squeegee 6.

  As shown in this figure, the screen plate 1 of the present embodiment has a rectangular frame 2 having a pair of sides extending in parallel with the scanning direction of the squeegee 6, and the extension is extended in the frame 2. At the center of the screen 3, a printed pattern 4 is formed which is formed of a rectangular frame-shaped opening that is the shape of the black mask 8. In the present embodiment, the print pattern 4 is formed on the screen plate 1 such that the print pattern 4 is tilted 45 ° to the right with respect to the scanning direction of the squeegee 6. Yes.

  The squeegee 6 is a spatula-shaped member made of a rubber material, as in the prior art, and the upper end side of the squeegee 6 is inclined by about 60 ° in the scanning direction, and is made of paste-like black supplied from a supply device (not shown). While the ink (not shown) is rubbed against the surface of the screen 3, the printed pattern 4 can be transferred to a substrate 7 as a workpiece by scanning once in one direction indicated by a white arrow in the figure. Has been.

  In the present embodiment, the print pattern 4 is disposed such that a pair of opposite sides thereof are inclined with respect to the scanning direction of the squeegee 6, and one of the four corners of the print pattern 4 is The layout is performed so as to be the end point of the print pattern 4 in the scanning direction of the squeegee 6.

  Further, a display panel substrate 7 as a work is arranged on the back surface of the screen plate 1 in accordance with the print pattern 4. At this time, an appropriate clearance is formed between the substrate 7 and the screen plate 1.

  When the squeegee 6 is scanned under the positional relationship between the print pattern 4 and the scanning direction of the squeegee 6, the squeegee is applied to the rectangular frame-shaped print pattern 4 formed as an opening on the screen 3. 6 starts printing from one corner located upstream in the scanning direction, and finishes printing at a corner located on the downstream side in the scanning direction of the squeegee 6 arranged diagonally to the one corner. Will be. In other words, in the present embodiment, the contact between the squeegee 6 and the print pattern 4 formed on the screen plate 1 is laid out so that it starts at a point and ends at a point.

  And in this embodiment laid out in this way, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and a sectional view taken along the line IV-IV in FIG. As shown in FIG. 4, the simultaneous contact area of the squeegee 6 that scans while applying an appropriate pressure does not differ greatly and is averaged.

  Therefore, when the squeegee 6 is scanned from the opening portion where the printing pattern 4 of the screen 3 is formed to the outside of the opening portion of the screen 3 and the contact is shifted, the tension applied to the screen 3 rapidly changes. Therefore, by reducing the final contact area of the squeegee 6 with respect to the print pattern 4, it is possible to perform the plate separation well.

  In FIG. 5, a rectangular frame-shaped black mask is printed on the outer peripheral portion of the substrate 7 of the display panel. The black mask obtained as a result of printing has a uniform printing thickness due to good plate separation.

  As described above, according to the screen printing method of the present embodiment, when the black mask 8 is formed on the substrate 7 of the display panel, as shown in FIG. An excellent black mask 8 without unevenness can be obtained.

  In the screen printing method of the present invention, the squeegee 6 is moved diagonally from one corner direction of the printing pattern 4 with respect to the printing pattern 4 formed on the screen plate 1 having the conventional configuration shown in FIG. It can also be executed by scanning obliquely in the corner direction.

  The present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

  For example, the print pattern may be a rectangular frame shape, and is not limited to the black mask print pattern of the above-described embodiment, and may be, for example, a peripheral seal print pattern.

  Further, the inclination angle of the printing pattern formed of the opening formed in the screen plate is not limited to the aforementioned 45 °, and the inclination direction is not limited to the right direction. However, in order to average the simultaneous contact area, the inclination angle is preferably 30 ° to 60 °.

Schematic diagram showing the layout relationship between the printing pattern and the scanning direction of the squeegee in the embodiment of the screen printing method of the present invention. II-II sectional view of FIG. III-III sectional view of FIG. IV-IV sectional view of FIG. Explanatory drawing which shows the black mask as a printing result of the screen printing method of this embodiment (The broken line in the figure shows each cross section of FIG. 2 thru | or FIG. 4) Schematic diagram showing the layout relationship between the printing pattern and the scanning direction of the squeegee in the conventional screen printing method VII-VII sectional view of FIG. VIII-VIII sectional view of FIG. IX-IX sectional view of FIG. Explanatory drawing which shows the black mask as a printing result of the conventional screen printing method (The broken line in the figure shows each cross section of FIG. 8 and FIG. 9)

Explanation of symbols

1 Screen version 2 Frame 3 Screen 4 Print pattern (opening)
6 Squeegee 7 Substrate 8 Black mask

Claims (2)

In a screen printing method for printing on a substrate using a rectangular frame-shaped print pattern formed as an opening in a screen plate,
A screen printing method, wherein printing is performed by performing layout so that one of the four corners of the print pattern is an end point of the print pattern in a squeegee scanning direction. 2. The screen printing method according to claim 1, wherein the layout is performed by forming the printing pattern on the screen plate such that a pair of opposing sides are inclined with respect to a scanning direction of the squeegee.

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