KR100793664B1 - Printer - Google Patents

Abstract

A printing apparatus is provided to improve the print quality of a color filter layer formed on a substrate by applying a uniform pressure to a substrate even though a flatness of the substrate does not satisfy a predetermined level in pressing the substrate in order to adjust heights of R G, B patterns printed on the substrate. A work stage supports a substrate. A press roll is disposed around the work stage to press the substrate on which at least one of R(red), G(green), B(blue) patterns is printed in order to adjust a height of at least one of the R, G, B patterns. The press roll includes a press roll body, a print sheet, and a buffer unit(73). The print sheet is disposed in an outer circumferential direction of the press roll body and coupled to the press roll body. The buffer unit is disposed between the press roll body and the print sheet to absorb a pressure applied to the print sheet in pressing the substrate.

Description

Print Device {Printer}

1A and 1B are diagrams illustrating two types of structures of color filter layers printed with R, G, and B patterns, respectively.

2 is a schematic structural diagram of a printing apparatus according to an embodiment of the present invention.

3 is a view for explaining the shape change of the R, G, B pattern printed on the substrate by pressing the press roll shown in FIG.

4 is a schematic perspective view of the vicinity of a press roll provided in the printing apparatus of FIG. 2.

FIG. 5 is a side view for explaining an installation state of a press roll provided in the printing apparatus of FIG. 2.

6 is a schematic side cross-sectional view of the press roll body shown in FIG. 4.

7 is a perspective view in one direction of the press roll shown in FIG. 4.

FIG. 8 is a perspective view in the other direction of the press roll shown in FIG. 4.

9 is a view for explaining a state in which the pressure sheet is wound on the press roll body of FIG.

FIG. 10 is a view for explaining an operation in which the pressure sheet is wound by the detachable unit of FIG. 9.

* Explanation of symbols for the main parts of the drawings

     1 printing apparatus 3 color resist

     10: Gravure Roll 15: Dispenser

     20: doctor blade 30: blanket roll

     40: work stage 45: vacuum suction transfer unit

     50: work table 60: lower base

     63: rail portion 70: press roll

     71: press roll body 77: pressure sheet

     73: cushioning portion 75: roll support portion

     76: up and down drive part 77: rotation drive part

     80: alignment detection unit 90: detachable unit

     95: tension adjustment unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus, and more particularly, to apply a uniform pressure to a substrate on which a color resist is printed when pressurizing the substrate to uniformly maintain the thickness of the R, G, and B patterns printed on the substrate. It relates to a printing apparatus that can be applied.

Recently, the flat panel display (FPD) has begun to emerge as the electronic display industry is rapidly developing among the semiconductor industry. A flat panel display is widely used as a display device of a TV, a computer monitor, or a device such as a mobile phone, a PDA, or a digital camera. Types of flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), and organic light emitting diodes (OLEDs).

Generally, a color filter layer is formed in a flat panel display to implement color. A color filter in which a black matrix is formed to prevent deterioration of image quality of a display device due to light leakage to an area other than an image display area is provided. It is provided.

A typical flat panel display having such a color filter is the LCD described above. The LCD includes a thin film transistor (TFT) substrate on which a thin film transistor is formed, a color filter substrate on which a color filter layer is formed, and a liquid crystal filled between these substrates.

In the color filter layer, as illustrated in FIGS. 1A and 1B, pixels having a pigment of R (Red), G (Green), and B (Blue) patterns are typically formed. Each pixel may consist of sub-pixels having R, G, and B, but in general, each pixel has one pigment.

In forming the color filter layer, as shown in FIG. 1A, R, G, and B patterns may be arranged in a row such that R, G, and B patterns are arranged in the same column, respectively (RGB Vertical Stripe), or in FIG. 1B. As shown, R, G, and B patterns may be repeatedly arranged in the same row (Mosaic). The difference in resolution can be realized in various ways according to the arrangement of the R, G, and B patterns.

Such a color filter layer can be produced by various methods, for example, a dyeing method, a printing method, an adhesive method, a pigment dispersion method and the like. STN (Super Twisted Nematic) LCD, which is one of the conventional passive matrix methods, mainly produces color filter layers by dyeing, printing, and adhesive methods, but it is an active matrix method that has excellent elaboration, good reproducibility, and is applicable to large-area liquid crystals. In TFT (Thin Film Transistor) LCD, pigment dispersion method is mainly used.

In the pigment dispersion method, a color filter layer is manufactured by forming a pattern of photosensitive color resists by a general photolithography process. That is, the color filter layer is completed by applying a photosensitive color resist on a substrate, irradiating light using a mask, and then applying a developer to form a desired pattern.

As such, a photo process is required to form a color filter by the pigment dispersion method, and this photo process causes a problem that the process is not only complicated but also expensive to manufacture. Furthermore, the process is further complicated since the photo process must be repeated three times in order to form pixels corresponding to the dyes of the R, G, and B patterns.

Recently, a method of using the printing method in the TFT LCD field has been proposed to overcome the problems of the pigment dispersion method.

The printing method has a gravure filled with color resist and a corresponding roll to form a color resist pattern of the corresponding dye on the substrate by the action of a roll, and then another color color resist by another roll. To form sequentially.

That is, after applying the R, G, B color resist (color ink, color pigment) on the outer surface of the so-called gravure roll or gravure plate, the blanket roll is applied to the gravure roll or gravure. After contacting the outer surface of the plate to transfer the R, G, B color resist from the gravure roll or the gravure plate, R, G, B patterns are formed on the substrate by the action of the blanket roll.

If such a printing method can be put to practical use, the process of manufacturing a color filter layer by printing R, G, and B patterns on a substrate may be more effectively performed. However, an apparatus capable of manufacturing a color filter layer using such a printing method (hereinafter, ' Printing device 'has not been put to practical use. Therefore, research and development on such a printing device is actively underway.

On the other hand, in such a printing apparatus, when the R, G, B pattern is formed on the substrate by the action of the blanket roll after transferring the R, G, B color resist from the gravure roll or the gravure plate, the recesses of the substrate, that is, the pixels Color resist, or ink, must be evenly filled in the areas to achieve the desired print quality.

However, when the R, G and B patterns are printed on the substrate, the height of the color resist printed on the substrate, that is, the R, G and B patterns, may be formed thicker than the height of the desired R, G and B patterns. The degree of charge of the R, G, and B patterns may slightly differ for each pixel area of the. As such, when the heights of the R, G, and B patterns are not uniformly maintained at a desired height, print quality may be degraded.

Therefore, in view of such a problem, a method of providing a press roll to press the R, G, B pattern printed on the substrate so that the height of the R, G, B pattern printed on the substrate can be maintained uniformly to the desired height Is being considered. On the outer surface of such a press roll, a pressure sheet which does not adhere to the color resist may be wound along the circumferential direction.

By the way, when pressurizing the substrate on which the R, G, and B patterns are printed by the press roll, pressure must be applied uniformly to an appropriate size. In order to apply a uniform pressure to the substrate as described above, the pressure sheet wound on the press roll must have a desired flatness, and the outer surface of the substrate on which the R, G, and B patterns are printed must be kept geometrically flat.

However, it is unreasonable to wish that substrates printed with R, G and B patterns always have a perfectly flat outer surface. Therefore, there may be a case where the outer surface of the substrate on which the R, G, and B patterns are printed is not as flat as desired, and in this case, when the substrate is pressed by the press roll, the concave portion of the substrate has a greater pressure than the convex portion of the substrate. Will receive. Therefore, even if the press roll is pressurized due to the uneven pressure applied to the substrate, the color resist may not be uniformly maintained at the desired height evenly on the substrate. In particular, the convex portion may be subjected to excessive pressure, which may cause damage to the substrate. It may be.

As such, if the flatness of the outer surface of the substrate on which the color resist is printed does not reach an acceptable level, even if the press sheet of the press roll has the desired flatness, the color filter layer finally formed on the substrate may not be evenly printed. You can't expect a consistently good print quality.

Therefore, when pressing the R, G, B pattern printed on the substrate with a press roll, a situation in which the color resist is to correct the flatness of the printed substrate, so that a uniform pressure is applied to the substrate.

Therefore, an object of the present invention, when pressing to adjust the height of the R, G, B pattern printed on the substrate, even if the flatness of the substrate deviated by a certain degree can be applied to the substrate to form a uniform pressure It is to provide a printing apparatus that can improve the print quality of the color filter layer.

The object is, in accordance with the present invention, a work stage for supporting a substrate; And R (Red) and G (Green) provided around the work stage to adjust the height of at least one of R (Red), G (Green), and B (Blue) patterns printed on the substrate. At least one of the B (Blue) pattern includes a press roll for pressing the printed substrate, the press roll comprising: a press roll body; A pressing sheet disposed along an outer circumferential direction of the press roll body and coupled to the press roll body; And a buffer unit provided between the press roll body and the pressure sheet to cushion a pressure applied to the pressure sheet when pressing the substrate.

Here, it is preferable that the shock absorbing portion is attached to an outer circumferential surface of the press roll body.

The buffer unit, the buffer layer for buffering the pressure applied to the pressure sheet in contact with the pressure sheet; And a buffer layer supporting film for adhering the buffer to the outer circumference of the press roll body and supporting the buffer layer.

The buffer layer may be formed of any one selected from urethane, nitrile butadiene rubber (NBR), and chloroprene rubber (CR).

The buffer layer supporting film may be made of any one material selected from polyethylene terephtalate (PET), polycarbonate (Poly Carbonate, PC), polyethersulfone (PES), and polyimide (Polyimide, PI). Can be.

The pressure sheet may be any one of a PS plate (Presensitized Plate) and a silicon coated polyethylene terephthalate (PET) film.

The buffer part may be stacked and provided in plurality.

It further comprises a blanket roll for contact printing and pressing the surface of the substrate for the printing operation, the press roll is pressurizing the substrate is printed all R (Red), G (Green), B (Blue) pattern It is desirable to.

The press roll may include a detachable unit which attaches and detaches the pressure sheet to the press roll body to which the buffer part is coupled; And at least one tension adjusting unit for adjusting the tension in the circumferential direction of the press roll body of the pressing sheet.

And a work table that floats the substrate for transfer to the work stage, wherein the press roll is coupled to the press roll body in a relative rotatable manner and moves between the work stage and the work table. Roll support coupled to the lower base to enable; An elevating driver for elevating the press roll body with respect to the substrate; And it may further comprise a rotation drive for rotating the press roll body relative to the roll support.

The roll supporting unit may further include at least one alignment sensing unit for acquiring image information regarding the position of the substrate.

The apparatus may further include a vacuum suction transfer unit installed on the roll support unit and holding the substrate on the work table by a vacuum suction force to transfer the substrate to the work stage.

The detachable unit may include a first detachable plate coupled to one end of the press sheet and detachably attached to the press roll body; And a second detachable plate coupled to the other end of the pressing sheet and detachably attached to the press roll body.

The tension adjusting unit may include a fixed end fixedly coupled to an outer circumference of the press roll body positioned between the first detachable plate and the second detachable plate; A free end coupled to the second detachable plate and slidably provided along the outer circumference of the press roll body together with the second detachable plate; And a distance adjusting end that connects the fixed end and the free end to adjust a distance between the fixed end and the free end.

The press roll body is provided in a shape in which a portion adjacent to the tension control unit is partially cut, wherein the press roll is at least one to allow the second detachable plate to be maintained at a distance from a partially cut outer periphery of the press roll body. It may further include a linear guide.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

2 is a schematic structural diagram of a printing apparatus according to an embodiment of the present invention, Figure 3 is for explaining the shape change of the R, G, B pattern printed on the substrate by pressing the press roll shown in FIG. 4 is a schematic perspective view of the vicinity of a press roll provided in the printing apparatus of FIG. 2, FIG. 5 is a side view for explaining an installation state of the press roll provided in the printing apparatus of FIG. 2, and FIG. Figure 4 is a schematic side cross-sectional view of the press roll body shown in Figure 4, Figure 7 is a perspective view in one direction of the press roll shown in Figure 4, Figure 8 is a perspective view in the other direction of the press roll shown in Figure 4 FIG. 9 is a view for explaining a state in which the pressure sheet is wound around the press roll body of FIG. 4, and FIG. 10 is a view for explaining an operation in which the pressure sheet is wound by the detachable unit of FIG. 9.

As shown in these figures, the printing apparatus 1 according to an embodiment of the present invention, the gravure roll 10, the outer surface of the gravure roll 10, R, G, B color resist (color) Dispensers 15 for applying any of the color resists 3 selected from ink and color pigments, and color resists present in unneeded areas of the color resists 3 applied to the outer surface of the gravure roll 10 ( 3) Dr. blades 20 (Dr. Blade) for removing and transfer the R, G, B color resist (3) from the gravure roll 10, the color filter substrate (hereinafter referred to as substrate (G)) Blanket Roll 30 for printing at least one of the R, G, B pattern on the surface of the substrate and at least any one of the R, G, B pattern for the substrate (G) Work stage 40 and the height of the R, G, B pattern printed on the substrate G supported by the work stage 40, that is, R, In order to uniformly match the thickness of the G and B patterns, the press roll 70 presses the surface of the substrate G, and the work table 50 moves the substrate G in the direction of the work stage 40. Table) and the lower base 60 supporting them.

The gravure roll 10 serves to transfer any color resist 3 selected from R, G, and B color resists to the outer surface of the blanket roll 30. Thus, the gravure roll 10 and the blanket roll 30 have substantially similar volumes. The gravure roll 10 is rotatable in a corresponding position by a roll driving part (not shown) coupled to a pair of left and right support parts 61 fixed to the lower base 60 and standing upright. The gravure roll 10 may be directly coupled to the roll driving unit, or may be coupled to the roll driving unit through a separate pocket (not shown). When the pocket is provided, there is an advantage that the replacement operation of the gravure roll 10 is easy as well as the eccentricity and the horizontal axis of the gravure roll 10 can be easily adjusted.

For reference, as described above with reference to FIGS. 1A and 1B, in printing the R, G, and B patterns on the substrate G, the R, G, and B patterns may not be simultaneously printed on the substrate G through one printing apparatus. Do not. That is, in order to print the R, G, and B patterns on the substrate G, at least three printing apparatuses are provided, and each of the R, G, and B patterns is selected and printed on the substrate G by the three printing apparatuses. . If the press roll 70 presses the substrate G on which the R, G, and B patterns are all printed as in the present embodiment, the press roll 70 may select the final pattern among the R, G, and B patterns. It may be provided in only one printing apparatus for printing and not in the remaining printing apparatus for printing the first pattern and the next pattern among the R, G, and B patterns.

Moreover, the dispenser 15 which apply | coats the color resist 3 to the outer surface of the gravure roll 10 by the dispenser 15 initially has only one color resist 3 selected from R, G, and B color resists. It is applied to the outer surface of (10). Expressed easily, the dispenser 15 applies only ink of one color selected from red, green and blue to the outer surface of the gravure roll 10.

Although not shown in detail, an uneven pattern is formed on the outer surface of the gravure roll 10 to substantially cover (coated) the color resist 3. The uneven pattern at this time may be both embossed or intaglio. In the case of embossing, the color resist 3 is applied to the outer surface of the protruding convex and concave portion (not shown), and transferred to the blanket roll 30. ) Is applied and transferred to the blanket roll 30.

However, the blanket roll 30 transfers the color resist 3 from the outer surface of the gravure roll 10 and prints (retransfers) it on the substrate G to form R, G, and B shapes as shown in FIGS. 1A and 1B. In forming the pattern, in order to maintain uniform thicknesses of the R, G, and B patterns from the surface of the substrate G, it may be advantageous that the uneven pattern formed on the outer surface of the gravure roll 10 has a negative shape.

Therefore, when any color resist 3 selected from R, G, and B color resists is applied to the outer surface of the gravure roll 10 by the dispenser 15, as shown in the enlarged portion of FIG. The color resist 3 should be applied only to the recess 10a. However, when the dispenser 15 applies the color resist 3 to the outer surface of the gravure roll 10, it is difficult to apply the color resist 3 to be selectively received only in the recess 10a of the substantially intaglio shape. Do.

Therefore, when the dispenser 15 applies the color resist 3 to the outer surface of the gravure roll 10, the color resist 3 is widely spread on the outer surface of the gravure roll 10 and applied. By removing the unnecessary color resist 3 applied to the remaining surface 10b except for the recess portion 10a, the color resist 3 can finally be accommodated only inside the recess portion 10a. To this end, a doctor blade 20 is provided in the periphery of the gravure roll 10 to remove the color resist 3 which is not necessary.

The doctor blade 20 includes a knife holder 21 and a knife 22 coupled to the knife holder 21. The knife holder 21 has a structure that can be easily attached and detached at a predetermined position of the support portion 61 in a one-touch fashion. The knife 22 has a length substantially similar to the length of the gravure roll 10, and the outer surface of the gravure roll 10 in the state that the tip is in contact with the outer surface of the gravure roll 10 (actually there is a slight gap). It is disposed to be inclined relative to the role of scratching the outer surface of the gravure roll (10).

Thus, since the front end of the knife 22 is in contact with the outer surface of the gravure roll 10, when the color resist 3 is applied to the outer surface of the rotating gravure roll 10, the recess 22 of the intaglio shape by the knife 22 The color resist 3 applied to the remaining surface 10b except for 10a can be naturally removed. Therefore, finally, the color resist 3 may be accommodated only in the recess 10a.

As described above, the dispenser 15 serves to apply the color resist 3 to the outer surface of the gravure roll 10. The dispenser 15 is provided not only to be movable along the longitudinal direction of the gravure roll 10 but also to be lifted or folded in one direction at the corresponding position. Therefore, the coating efficiency of the color resist 3 can be improved, and the interference with the surrounding structure can be avoided.

Meanwhile, the blanket roll 30 receives the color resist 3 applied in the recess 10a formed on the outer surface of the gravure roll 10 and then moves to the work stage 40 to transfer the substrate G to the substrate G. It serves to substantially print the R, G, B pattern as shown in Figs. 1A and 1B.

On the outer surface of the blanket roll 30, a printing sheet (not shown) in which the color resist 3 is transferred from the gravure roll 10 is wound. Of course, since the printing sheet used a number of times more than the appropriate limit should be replaced, the blanket roll 30 is further provided with a sheet replacement means (not shown) for easily replacing the printing sheet. The sheet replacement means serves to provide a certain tension to the printing sheet so that the sheet can be easily replaced, while the printing sheet is unfolded and stretched and wound on the outer surface of the blanket roll 30. .

The blanket roll 30 must be accessible and spaced apart from the gravure roll 10 as well as able to rotate on the top surface of the substrate G loaded on the work stage 40. To this end, on both sides of the blanket roll 30, in addition to moving the blanket roll 30 in a linear direction in accordance with the operation of the rail (not shown) installed on the side of the lower base 60, the blanket roll 30 in the corresponding position A driving part (not shown) which rotates () is provided. At this time, the structure for moving the blanket roll 30 by the driving unit may be applied to linear motion (Linear motion), etc. capable of precise control.

The work stage 40 is a place where the printing operation of the R, G, and B patterns on the substrate G proceeds, and the work table 50 plays a role of transferring the substrate G to the work stage 40. . In recent years, since the process operation using the 8th generation board | substrate G whose width | variety and the width | variety of a width | variety and a longitudinal are 2 or more progresses, it is difficult to convey the board | substrate G by a simple adsorption method. Therefore, as an alternative, a method of transporting the substrate G after floating the substrate G is under study. This transfer method is applied to the work table 50.

On the other hand, after completing the printing of the R, G, B pattern of the substrate G on the work stage 40 by such a configuration, the thickness of the R, G, B pattern printed on the substrate G must be kept uniform. do. This will be described in more detail with reference to Figure 3 for, by a blanket roll (30) R, G, the cross sectional shape of the substrate printing is complete, the B pattern is '①', such as R, G, the height of the B pattern (H ₁ ) May not only be formed thicker than the required height (H ₂ of '②'), but may not be uniformly maintained at a desired height. Therefore, by pressing the R, G, B pattern of the substrate G with the above-described press roll 70 to maintain the shape of the R, G, B pattern at a uniform height (H2), such as '②', excellent printing quality Can be implemented.

Therefore, the printing apparatus 1 of the present embodiment is movably coupled to the lower base 60 so as to move between the work table 50 and the work stage 40, and the surface of the substrate G, that is, R, G, The press roll 70 which can press the B pattern is provided.

The press roll 70 includes a press roll body 71, a press sheet 72 arranged along the outer circumferential direction of the press roll body 71, and coupled to the press roll body 71, and a press roll body 71. And the pressure sheet 72 provided between the pressure sheet 72 and the buffer part 73 for buffering the pressure applied to the pressure sheet 72 when pressing the substrate, and the press roll body 71 to which the buffer part 73 is coupled. The detachable unit 90 for attaching and detaching the 72, the at least one tension adjusting unit 95 for adjusting the tension of the press sheet 72 in the circumferential direction of the press roll body 71, and the detachable unit 90 are presses. The linear guide 78 provided to be spaced apart from the outer circumference of the roll body 71 and the press roll body 71 are rotatably coupled to each other so as to be movable between the work stage 40 and the work table 50. The roll support part 75 coupled to the lower base 60 and the press roll body 71 are lowered relative to the substrate G. Key is provided with a rotary drive unit 77 to rotate about the elevating driving unit 76, and a press roll body 71 to the roll support (75).

The press roll body 71 is provided to be rotatable in the upper portion of the substrate (G). And as shown in detail in Figures 8 to 10, one side is provided in the shape of a cylindrical incision, the portion in which the pressing sheet 72 is wound into a curved surface, the portion in which the tension control unit 95 is installed is formed in a plane It is.

On the other hand, on the outer circumference of the press roll body 71, as shown in Figure 6, the buffer portion 73 is provided. The buffer part 73 corrects the flatness of the substrate G in the process of pressing the contact sheet 72 in contact with the substrate G so that the pressure applied to the substrate G becomes an appropriate size. .

For example, if the error of the outer surface flatness of the substrate G on which the color resist 3 is printed exceeds the permissible range, an uneven pressure is forced on the substrate G, which deteriorates the final print quality. Or damaging the substrate G.

In order to prevent such deterioration of final print quality or damage to the substrate G, the buffer portion 73 is provided on the outer circumference of the press roll body 71. That is, in the process in which the press roll 70 pressurizes the substrate G, even if the outer surface flatness of the substrate G on which the color resist 3 is printed is out of tolerance, the pressing sheet 72 is the buffer portion 73. ), The effect of the error can be absorbed so that no excessively large or small pressure is applied to the substrate G locally.

Thus, the buffer portion 73 is a buffer layer made of a soft material to buffer the force applied to the pressure sheet 72, that is, to serve as a cushion for the pressure sheet 72 73a is provided.

And it is preferable that the hardness of this buffer layer 73a is smaller than the hardness of the press sheet 72. As shown in FIG. This is because when the buffer layer 73a buffering the pressure sheet 72 is used as a softer material than the pressure sheet, the pressure applied to the pressure sheet 72 may be too small in the process of pressing the substrate G. This is because it may be difficult to adjust the height of the color resist 3 printed on the substrate G when the pressure applied to the pressure sheet 72 becomes too small. Accordingly, the buffer layer 73a may be selected from urethane, nitrile butadiene rubber (NBR), and chloroprene rubber (CR), which are oil-resistant foam rubber.

 In addition, the buffer layer 73a is bonded to be fixed to the outer circumference of the press roll body 71. At this time, the buffer layer 73a should also be provided to be tightly wrapped along the outer circumference of the press roll body 71. Same as (72). However, the buffer layer 73a is selected from soft urethane, nitrile butadiene rubber (NBR), or chloroprene rubber (CR), so that the press roll body 71 is used. In the case of a tension in the circumferential direction of), a local bending or tearing may occur on the surface.

Therefore, the buffer part 73 is further provided with the buffer layer support film 73b which supports the buffer layer 73a by disperse | distributing the tension | tensile_strength of the press roll body 71 applied to the buffer layer 73a. The buffer layer supporting film 73b is provided to have substantially the same area as the buffer layer 73a, and one surface is bonded to the buffer layer 73a and the other surface is bonded to the outer circumference of the press roll body 71. And the buffer layer support film 73b uses a comparatively hard material so that the soft buffer layer 73a can be supported. Therefore, the buffer layer supporting film 73b is a hard synthetic resin film of polyethylene terephthalate (Polyethylen Terephtalate (PET), polycarbonate (Poly Carbonate, PC), polyethersulfone (Polyethersulfone (PES)) and polyimide (Polyimide, PI) Any one can be selected and used.

In the present embodiment, the buffer unit 73 is provided to be fixedly attached to the press roll body 71, but the scope of the present invention is not limited to this, so as to be detachably attached to the press roll body 71 like the pressure sheet 72. You can also arrange. In addition, in the present embodiment, one buffer unit 73 is provided, but the scope of the present invention is not limited thereto, and the buffer unit 73 may be stacked and provided in plurality.

 The press sheet 72 is a portion in direct contact with the R, G, and B patterns when the press roll body 71 presses the substrate G. The press sheet body 71 is wound around the press roll body 71. With the rotation of), the R, G, and B patterns are directly pressed. However, since the pressing sheet 72 is used only for pressing, the R, G, and B patterns formed on the substrate G after pressing should not be buried in the pressing sheet 72. For this purpose, the pressing sheet 72 is a PS plate (Presensitized). Plate).

PS plate (Presensitized Plate) is a metal plate, because it is a flexible flat plate can be easily wound on the press roll body (71). Since the PS plate is coated with a material such as a photosensitive agent in advance, a process such as application or corrosion of the photosensitive agent is omitted and can be easily plated. Since the PS plate is a metal plate having a predetermined surface hardness, The formed R, G, and B patterns can be uniformly pressed. However, in the present embodiment has been described above to form the pressure sheet 72 to the PS plate, the scope of the present invention is not limited to this, but a silicon coated polyethylene terephthalate (PET) film may be used.

And, in order for the function of the pressing sheet 72 to be performed smoothly, it is preferable that the pressing sheet 72 is in a state of being tightly wound around the outer circumference of the press roll body 71. In this state, the pressure sheet 72 is coupled to the detachable unit 90 and the detachable unit 90 is attached to the press roll body 71 by the tension adjusting unit 95 in the circumferential direction of the pressure sheet 72. The tension of the is adjusted, as described above, the pressing sheet 72 is used in a state of being subjected to a certain size of tension to be tightly wound on the press roll body 71.

As shown in detail in FIGS. 8 to 10, the detachable unit 90 attaches and detaches the press sheet 72 to the press roll body 71, and the first detachable plate 90a and the second detachable plate 90b. It is provided. One end of the pressure sheet 72 is coupled to the first detachable plate 90a, and the other end of the pressure sheet 72 is coupled to the second detachable plate 90b, and the first detachable plate 90a and the second detachable plate ( The press sheet 72 is detachably attached to the press roll body 71 by attaching and detaching the 90b) to the press roll body 71. By providing the detachable unit 90 as described above, the pressure sheet 72 can be easily attached to the press roll body 71.

The tension adjusting unit 95 adjusts the tension of the pressure sheet 72 provided in the press roll body 71. The tension adjusting unit 95, as shown in detail in Figure 10, the fixed end (95a) fixedly coupled to the outer periphery of the press roll body 71, the freedom to slide along the outer periphery of the press roll body 71 A stage 95b and a distance adjusting end 95c for adjusting the distance between the fixed end 95a and the free end 95b are provided. Thus, when the free end 95b slides along the outer circumference of the press roll body 71 according to the operation of the distance adjusting end 95c, the second detachable plate 90b connected to one end of the free end 95b is together. By sliding along the outer circumference of the press roll body 71, the tension of the pressure sheet 72 attached to the second detachable plate 90b is adjusted. Thus, by providing the tension adjusting unit 95, it is possible to easily apply tension to the pressure sheet (72).

The linear guide 78 allows the second detachable plate 90b provided on the press roll body 71 to have a predetermined interval with respect to the outer circumference of the press roll body 71. That is, the linear guide 78 suppresses the movement toward the press roll body 71 of the free end 95b so that the second detachable plate 90b connected to the free end 95b is formed on the outer circumference of the press roll body 71. There is a certain interval for. As such, since the press roll 70 includes the linear guide 78, the process of attaching the press sheet 72 to the press roll body 71 can be performed stably and precisely, and the press sheet 72 Relative movement with respect to the outer circumference of the press roll body 71 of the pressure sheet 72 can be prevented while the attachment is completed and the printing process is performed thereafter.

4 to 5, the roll support 75 moves in the longitudinal direction of the lower base 60 while supporting or coupling various components provided in the press roll 70. . The roll support portion 75 is coupled to the rail portion 63 of the lower base 60 at both sides of the lower base 60 so as to move the pair of both end bodies 75a to move the entire press roll body 71 to a predetermined position. ), A pair of connecting portions 75b for connecting the both ends of the body 75a, and an axial center coupling portion 75c to which the shaft center of the press roll body 71 is coupled.

The lower end of both ends of the body (75a) is coupled to the rail portion 63 provided in the lower base 60, the press roll 70 is the longitudinal direction of the lower base 60, that is, the work table 50 and the work stage 40 Sliding movement between the linear motion (Linear motion) state. Since the sliding movement is made by a linear driving unit (not shown) such as a linear motor mounted on the lower base 60, precise control is possible, and thus, a press roll body coupled to the roll support 75. 71 can move exactly to the desired horizontal position.

Each connection part 75b is connected in the side surface of the both ends body 75a. As will be described in detail later, in the connecting portion 75b, an alignment position for aligning the substrate G before pressing the substrate G on which the R, G, and B patterns are printed by the press roll body 71 is pressed. An alignment detecting unit 80, ie, an alignment camera 80, and a vacuum suction transfer unit 45 for transferring the substrate G from the work table 50 to the work stage 40 are installed. In addition to improving the efficiency of the workspace, the tact time can be reduced. These will be described later in detail.

The shaft coupling portion 75c is a portion to which the shaft cores 79 formed at both ends of the press roll body 71 are coupled, and the horizontal axis of the press roll body 71 is adjusted as well as adjusting the eccentricity of the press roll body 71. Position control unit (not shown) for precisely controlling the R, G, B formed on the front surface of the substrate (G) to be uniform pressure is applied.

On the other hand, the press roll 70 is provided with a raising and lowering driving unit 76 so that the press roll body 71 can approach (fall) and space (raise) the substrate G on which the R, G, and B patterns are formed. . Therefore, as described above, the press roll 70 can be moved to a desired horizontal position by a linear driver (not shown) provided in the lower base 60, and also by the elevating driver 76 to lift the substrate G. Since the upper surface is accessible, the pressing operation on the substrate G may be performed. In this case, the press roll 70 is moved to the linear motion state by the elevating driving unit 76 so that particles are prevented from falling down on the substrate G during the elevating operation. Precise pressurization on G) can be carried out.

The press roll 70 is provided with a rotation drive unit 77 so that the press roll body 71 can rotate and press on the upper surface of the substrate G on which the R, G, and B patterns are formed. When the press roll 70 pressurizes the substrate G, the press roll body 71 must be rotated, as well as the press roll in the longitudinal direction of the lower base 60, that is, in the longitudinal direction of the substrate G. 70) The whole must move. Therefore, it is necessary to confirm whether or not the substrate G is supported at the correct alignment position of the work stage 40 before pressing the substrate G. In the printing (retransition) process of the R, G, and B patterns by the blanket roll 30 which is usually performed before the pressurizing operation, the substrate G is separated from the alignment position due to the pressure of the blanket roll 30. As a result, alignment with respect to the substrate G must proceed again. To this end, as outlined above, two alignment sensing units 80, namely, are connected to the connecting portion 75b facing the work stage 40 among the connecting portions 75b for connecting both ends of the body 75a of the roll support 75. The alignment camera 80 is installed.

The alignment camera 80 photographs eye marks (not shown) displayed on the vertex area of the substrate G above the work stage 40, and then uses the captured image information as a controller (not shown). send. In the present embodiment, the alignment camera 80 is applied to the alignment detecting unit 80, but the present invention is not limited thereto.

For reference, since the alignment position information of the substrate G is previously input to the controller, when the alignment camera 80 photographs an eye mark formed on the substrate G at the corresponding position, the image information is sent to the controller. The controller may compare these values to determine how far the substrate G, which is the workpiece, is deviated from the alignment position. When the degree of departure of the substrate G is calculated, the substrate G is aligned with respect to the press roll 70 by moving the work stage 40 in the X, Y and θ axis directions.

Meanwhile, as shown in FIGS. 4 and 5, the vacuum suction transfer part 45 may be mounted on both connecting portions 75b of the roll support part 75. The vacuum suction transfer part 45 serves to transfer the substrate G from the work table 50 to the work stage 40 using the vacuum suction force. Usually, a transport robot (not shown) for transporting the substrate G may be provided around the substrate G to transfer the substrate G on the work table 50 to the work stage 40. By mounting the vacuum suction transfer unit 45, which performs substantially the same role as the press roll 70, the working space can be used more efficiently, and the effect of shortening the tact time required for the work can be reduced. have.

Hereinafter, an operation and a printing method of the printing apparatus 1 according to an embodiment of the present invention having such a configuration will be described with reference to FIGS. 2 to 10.

First, the substrate G, which is the workpiece, is transferred to the work stage 40 through the work table 50 before applying the color resist 3 selected from the R, G, and B color resists to the gravure roll 10. Let's do it. In this case, the substrate G in the work table 50 may be transferred to the work stage 40 by a separate transport robot (not shown). In this embodiment, the roll support 75 of the press roll 70 may be transferred. The substrate G is vacuum-adsorbed on the work table 50 using the vacuum suction transfer unit 45 coupled to the vacuum transfer unit 45. The substrate G is moved to the work stage 40 while the substrate G is vacuum-adsorbed. The substrate G held by 45 is lowered to the work stage 40. When the substrate G is supported by the work stage 40, the press roll 70 returns to its original position.

Subsequently, during the alignment process of the substrate G in the work stage 40, a process of applying one of the color resists 3 selected from R, G, and B color resists to the gravure roll 10 is performed. Will proceed. At this time, in order to shorten the tact time required for the operation, the substrate G is transported and seated on the work stage 50, and the operation of applying the color resist 3 to the gravure roll 10 is performed. You can do it at the same time.

Subsequently, the color resist 3 applied to the outer surface of the gravure roll 10 is filled in the recess 10a of the gravure roll 10 while the gravure roll 10 is rotated about a predetermined axis of rotation. The color resist 3 diffused to the remaining surface 10b except for the recess 10a of the gravure roll 10 by 20 is removed.

When the application of the color resist 3 to the gravure roll 10 is completed, the blanket roll 30 moves in the direction of the gravure roll 10 by the operation of a rail unit (not shown) provided in the lower base 60. In addition, the blanket roll 30 and the gravure roll 10 are in contact with each other and rotate in opposite directions to transfer the color resist of the gravure roll 10 to the blanket roll 30.

The blanket roll 30 transferred from the color resist 3 moves to an upper portion of the substrate G on which the substrate G, which is a workpiece, is supported, and then transfers the color resist 3 transferred from the gravure roll 10 to the substrate. Reprint, ie, print on (G).

When all of the R, G, and B patterns are printed on the substrate G by such a printing operation, the cross-sectional shape of the substrate G on which the R, G, and B patterns are printed is larger than the desired thickness as shown in '①' of FIG. It may be formed thick and may be formed unevenly.

Therefore, the press roll 70 for pressurizing the R, G, and B patterns printed on the substrate G to a predetermined thickness H2 as shown in '②' of FIG. 3 moves in the direction of the work stage 40. Then, the two alignment cameras 80 mounted on the roll support unit 75 capture eye marks (not shown) displayed near the vertices of the substrate G to obtain position information of the substrate G, and then press roll ( 70 is performed to align the substrate (G).

After the alignment work of the substrate G is completed, the press roll body 71 is lowered from the upper surface of the substrate G to a predetermined height position by the elevating driving unit 76, and rotated by the rotation driving unit 77. The pressing operation on the substrate G is performed. As a result, uniform pressure is applied to the entire surface of the substrate G, that is, the R, G, and B patterns.

At this time, the pressing sheet 72 is in contact with the substrate (G) in the process of pressing the substrate (G) is subjected to the printing pressure. As mentioned above, this pressure must be applied to an appropriate size.

By the way, if a concave or convex portion is formed on the outer surface of the substrate G on which the color resist 3 is printed and the outer surface of the substrate G is not entirely flat, uneven pressure may be applied to the pressure sheet 72. have. However, in the present embodiment, as shown in Figs. 9 and 10, because the buffer portion 73 is provided between the press roll body 71 and the pressure sheet 72 to the non-uniform flatness of the substrate (G). Due to the non-uniform pressure of the substrate G, which may be caused, the pressure may be uniformly applied to the substrate G as a whole.

When the pressing operation is completed, the press roll body 71 is elevated to its original height and returns to the initial position. By this process, the printing and pressing operations of the R, G, and B patterns on the substrate G are completed.

As described above, according to the present embodiment, when pressing to adjust the heights of the R, G, and B patterns printed on the substrate, even if the flatness of the substrate deviates to a certain degree, a uniform pressure may be applied to the substrate to form the substrate. The print quality of the color filter layer to be improved can be improved.

In the above-described embodiment, the press roll is pressed against the substrate supported on the work stage for printing the substrate. However, the press roll may press the substrate supported on the work stage provided separately from the printing operation.

In addition, in the above-described embodiment, the blanket roll receives the color resist from the gravure roll, but instead of the gravure roll, a square plate-shaped gravure plate is provided, and the blanket roll transfers the color resist from the gravure plate. You can do it.

As described above, the present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

As described above, according to the present invention, even when pressing to adjust the height of the R, G, B pattern printed on the substrate, even if the flatness of the substrate deviates by a certain degree, it is possible to apply a uniform pressure to the substrate The print quality of the color filter layer formed on the can be improved.

Claims (15)

A work stage for supporting the substrate; And It is provided in the periphery of the work stage, the R (Red), G (Green) to adjust the height of at least one pattern of the R (Red), G (Green), B (Blue) pattern printed on the substrate And a press roll for pressing the substrate on which at least one of the B (Blue) patterns is printed, The press roll is, Press roll body; A pressing sheet disposed along an outer circumferential direction of the press roll body and coupled to the press roll body; And And a buffer unit provided between the press roll body and the pressure sheet to buffer a pressure applied to the pressure sheet when pressing the substrate. The method of claim 1, The buffer unit is characterized in that the adhesive provided on the outer peripheral surface of the press roll body. The method of claim 2, The buffer part, A buffer layer which buffers the pressure applied to the pressure sheet in contact with the pressure sheet; And And a buffer layer supporting film for adhering the buffer to the outer circumference of the press roll body and supporting the buffer layer. The method of claim 3, The buffer layer is a printing device, characterized in that any one selected from urethane (Urethane), nitrile butadiene rubber (Ntrile Butadiene Rubber, NBR) and Chloroprene rubber (CR). The method of claim 3, The buffer layer supporting film, Print apparatus characterized in that the polyethylene terephthalate (Polyethylen Terephtalate (PET), polycarbonate (Poly Carbonate, PC), polyethersulfone (Polyethersulfone, PES) and polyimide (Polyimide, PI). The method of claim 1, The press sheet is a printing device, characterized in that any one of a PS plate (Presensitized Plate) and silicone coated polyethylene terephthalate (PET) film. The method of claim 1, The buffer unit is laminated, characterized in that provided in plurality. The method of claim 1, It further comprises a blanket roll for contacting and pressing the surface of the substrate for the printing operation, The press roll is a printing apparatus, characterized in that for pressing the substrate on which the R (Red), G (Green), B (Blue) pattern is printed. The method of claim 1, The press roll is, A detachable unit which attaches and detaches the pressure sheet to the press roll body to which the buffer part is coupled; And And at least one tension adjusting unit for adjusting the tension in the circumferential direction of the press roll body of the press sheet. The method of claim 9, Further comprising a work table floating the substrate for transfer to the work stage, The press roll is, A roll support part coupled to the press roll body so as to be relatively rotatable and coupled to a lower base to move between the work stage and the work table; An elevating driver for elevating the press roll body with respect to the substrate; And And a rotation drive unit for rotating the press roll body with respect to the roll support unit. The method of claim 10, And at least one alignment sensing unit installed in the roll supporting unit and acquiring image information regarding the position of the substrate. The method of claim 10, And a vacuum suction transfer unit installed on the roll support unit and holding the substrate on the work table by a vacuum suction force and transferring the substrate to the work stage. The method of claim 9, The detachable unit, A first detachable plate coupled to one end of the pressure sheet and detachably attached to the press roll body; And And a second detachable plate coupled to the other end of the pressure sheet and detachably attached to the press roll body. The method of claim 13, The tension control unit, A fixed end fixedly coupled to an outer circumference of the press roll body positioned between the first detachable plate and the second detachable plate; A free end coupled to the second detachable plate and slidably provided along the outer circumference of the press roll body together with the second detachable plate; And And a distance adjusting end that connects the fixed end and the free end to adjust a distance between the fixed end and the free end. The method of claim 14, The press roll body is provided in a shape in which a portion adjacent to the tension control unit is partially cut out, The press roll is, And at least one linear guide for maintaining the second detachable plate at a predetermined distance from the partially cut outer periphery of the press roll body.

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