KR100760311B1 - Patterning method of display device - Google Patents

Abstract

A patterning method of a display device is provided to form a uniform image or a uniform phosphor layer by using a non-contact method for injecting a patterning material on a surface of a substrate. A patterning material including paste(220) is coated on each of grooves(211) of an injection substrate(210). One surface of the injection substrate including the patterning material is aligned on a surface of a substrate(260) of a display device. The patterning material is heated by irradiating laser beams(240) on the other surface of the injection substrate. The patterning material is injected and patterned on the surface of the substrate of the display device by using pressure of air bubbles(250) generated in the inside of the patterning material. A desired pattern is formed on the surface of the substrate of the display device by performing repeatedly the above processes.

Description

Patterning method of display device {PATTERNING METHOD OF DISPLAY DEVICE}

1 is a cross-sectional view schematically illustrating a structure of a plasma display panel.

2 is a schematic diagram illustrating a fluorescent layer patterning method of a plasma display panel using an integrated absorption jet substrate and a laser according to the present invention;

3 is a schematic view for explaining a fluorescent layer patterning method of a plasma display panel using a separate absorption jet substrate and a laser according to the present invention;

4 is a schematic view for explaining a fluorescent layer patterning method of a plasma display panel using an integrated transmission substrate and a laser according to the present invention;

5 is a schematic diagram illustrating a fluorescent layer patterning method of a plasma display panel using a separate transmission substrate and a laser according to the present invention.

  ♠ Explanation of symbols on the main parts of the drawing ♠

210: jet substrate 211: groove

220: phosphor paste 230: squeegee

240: laser 250: bubble

260: PDP substrate 261: partition wall

270 fluorescent layer

The present invention relates to a method of patterning an image or fluorescent layer on the surface of a substrate of a display device, and more particularly to a method of patterning a uniform image or fluorescent layer on the surface of a substrate by heating and spraying a patterning material using a laser. It is about. That is, the present invention relates to a method of patterning a fluorescent layer or an image on a substrate surface of a plasma display panel (PDP), a liquid crystal display (LCD), and an organic light emitting diode (OLED) representing a display device. .

1 is a cross-sectional view showing a schematic structure of a PDP, and shows a structure of a PDP composed of two substrates 110 and 130, a partition wall 120, and a fluorescent layer 140. As shown in FIG. 1, the fluorescent layer 140 is applied to a surface between the partition walls 120 formed on the lower substrate 110. Therefore, when the ultraviolet rays of the plasma generated inside the partition wall 120 is incident on the fluorescent layer 140, visible rays of red (R), green (G), and blue (B) are generated according to the type of the fluorescent layer 140. The visible light passes through the upper glass substrate 130 to implement an image.

PDPs are mainly used in large display devices of 40 inches or more because they are excellent in image quality, thin in thickness, and light in weight as flat panel display elements. Recently, as the PDP screen resolution increases, the pitch of sub-pixels between partition walls is decreasing from 420 µm to 200 µm or less, and the partitions have a rectangular shape instead of a simple stripe shape. Or a complex cell such as honeycomb or the like. Therefore, there is a need for a method capable of forming a uniform fluorescent layer in various cells composed of fine barrier ribs.

As a conventional method of forming the fluorescent layer on the surface between the partition walls, a screen printing method using a squeeze or an inkjet method in which a phosphor paste is sprayed and filled between the partition walls is used.

Screen printing method using squeegee has the advantages of simple equipment and high productivity as described in Korean Patent Application No. 1999-0009554 (name of invention-plasma display panel and its phosphor coating method), but squeegee is in contact with mask While screen printing, the amount of the applied phosphor is not only non-uniform, but also has a disadvantage in that a dimension error occurs due to deformation of the mask due to friction caused by contact.

The method of coating a fluorescent layer using inkjet is described in a research paper "Phosphor paste properties in inkjet patterning of phosphors for high resolution PDP" (Mol. Cryst. Liq. Cryst., Vol. 425, 2004). Although it is suitable for applying the green and blue phosphor layers, the phosphor powder can block the fine nozzles of the inkjet head, and the equipment has to be complicated and expensive because it must be sprayed while precisely controlling the position of the inkjet nozzles.

In addition, the method of applying a fluorescent layer using a laser is described in the research paper "Laser thermal patterning of OLED materials" (Proc. Of SPIE, Vol. 5519, 2004) and LITI (Laser Induced Thermal Imaging) process technology and research paper "Optimization" An example is the Laser Induced Forward Transfer (LIFT) process technology described in "of laser-induced forward transfer process of metal thin film" (Applied Surface Sci., Vol. 197, 2002).

In these process technologies, a laser absorbing layer is formed on one surface and a fluorescent layer is printed using a laser and a plastic film coated with a fluorescent layer such as a polymer in a solid state. That is, these process techniques selectively irradiate a laser absorbing laser to a laser absorbing layer in a state in which the fluorescent layer of the plastic film is in close contact with the substrate to print a fluorescent layer of a desired pattern on the substrate. As a result, these process technologies use a laser to heat up, resulting in a high printing speed. Accordingly, the present invention can be efficiently applied to printing fluorescent layers on LCD panels using flat glass substrates. However, unlike LCD, these process technologies cannot be applied to PDPs with bulkheads. That is, since the fluorescent layer of the plastic film cannot contact the surface between the partition walls due to the partition walls of the PDP, these process techniques cannot be applied to the PDP.

In addition, these process technologies use a low-productivity plastic film due to the complicated process of applying a fluorescent layer on one surface, and a high quality laser having a specific wavelength and a specific profile capable of printing a certain type of fluorescent layer on a substrate. do. In addition, since the fluorescent layer coated on the plastic film is selectively printed on the substrate and the remainder remains on the film during printing, not only material loss occurs but also it is difficult to accurately control the thickness of the printed fluorescent layer.

Therefore, the present invention has been made to solve the problems of the prior art as described above, by heating the patterning material uniformly filled in the injection substrate with a laser to spray on the surface of the substrate to form a uniform patterning at high speed and It is an object of the present invention to provide a patterning method of a display device that improves productivity.

The present invention comprises filling and applying a patterning material containing a paste into each groove of the injection substrate having a plurality of grooves, aligning one surface on which the patterning material is applied to the top of the substrate surface of the display device, and Irradiating a laser onto the other side of the substrate to heat the patterning material and thereby spraying the patterned material onto the substrate surface of the display device at a pressure of bubbles generated inside the patterning material, thereby patterning the steps one or more times. By repeating to form all the desired patterning on the substrate surface of the display device.

The display device of the present invention may be a plasma display panel (PDP), a liquid crystal display (LCD), or an organic light emitting diode (OLED).

The spray substrate of the present invention may be integrally formed, but the spray substrate may be made of a laser absorbing material to indirectly heat the phosphor paste with a laser, or the spray substrate may be made of a laser transmitting material to directly heat the phosphor paste with a laser.

The jet substrate of the present invention can be constituted by a mask plate having a flat plate and a plurality of holes forming grooves in close contact with the flat plate. In this case, the plate may be made of a laser absorbing material to indirectly heat the phosphor paste with a laser, or the plate may be made of a laser transmitting material to directly heat the phosphor paste with a laser.

The plurality of grooves of the present invention may have a shape in which one groove is formed every three spaces formed between the partition walls of the PDP so as to form the fluorescent layer patterning of any one of red, green, and blue colors necessary on the surface of the PDP substrate.

Hereinafter, a preferred embodiment of a patterning method of a display apparatus according to the present invention will be described in detail with reference to the accompanying drawings, and a method of patterning a fluorescent layer on the surface of a substrate using a plasma display panel as an example will be described.

2 is a schematic diagram illustrating a fluorescent layer patterning method of a plasma display panel using an integrated absorption jet substrate and a laser according to the present invention. As shown in FIG. 2, the absorption jet substrate 210 of this embodiment is integrally formed in a flat plate shape, and a plurality of grooves 211 are formed at one interval on one surface thereof. The absorption jet substrate 210 is made of a material such as metal or ceramic that absorbs the laser without passing the laser and the temperature thereof rises.

The plurality of grooves 211 are processed by etching, laser drilling, or the like so as to coincide with the space between the partition walls 261 of the PDP substrate 260. At this time, a plurality of grooves 211 are formed for every three spaces formed between the partition walls 261 of the PDP substrate 260. That is, the plurality of grooves 211 has a shape in which one in every three spaces formed between the partition walls 261 is patterned so as to pattern a fluorescent layer of any one of red, green, and blue colors required in the PDP substrate 260 at one time. . However, the plurality of grooves 211 may be formed in a one-to-one correspondence to the space formed between the partition walls 261 or one arranged in multiples of three of the spaces.

In addition, the plurality of grooves 211 have a volume, a shape, and the like in consideration of the fluorescent layer to be formed between the partition walls 261. The groove 211 fills the phosphor paste 220, which is a patterning material (including paste), and when the laser is irradiated, sprays the phosphor paste 220, and creates the inside of the phosphor paste 220 by the irradiated laser. The pressure of the bubble is prevented from propagating to other grooves.

Hereinafter, a method of patterning a fluorescent layer on a plasma display panel using an integrated absorption jet substrate 210 and a laser configured as described above will be described.

FIG. 2A illustrates a screen printing method of filling the grooves 211 of the absorption jet substrate 210 with the phosphor paste 220 mixed with the phosphor powder, the binder, and the solvent using the squeegee 230. First, as shown in FIG. 2A, a certain amount of phosphor paste 220 is filled and applied to the groove 211 of the absorption jet substrate 210 by screen printing.

Then, as shown in (b) of FIG. 2, the grooves 211 and the partition walls of the absorption jet substrate 210 face the surface coated with the phosphor paste 220 toward the PDP substrate 260. Align the PDP substrate 260 with the space between the 261. Then, the laser 240 is irradiated to the other surface of the absorption jet substrate 210 (the opposite surface to which the phosphor paste is applied). As a result, the absorption jet substrate 210 absorbs the laser 240 and the temperature thereof rises, whereby the phosphor paste 220 filled in the groove 211 of the absorption jet substrate 210 is indirectly heated. At this time, the phosphor paste 220 is rapidly heated by the laser 240, and thus bubbles 250 are generated inside the phosphor paste 220. When the pressure of the bubble 250 generated in this way increases, the phosphor paste 220 is injected from the groove 211 of the absorption jet substrate 210 to the surface between the partitions 261 of the PDP substrate 260 by the force. The injected phosphor paste is attached to the surface between the partition walls 261 of the PDP substrate 260 and forms a concave fluorescent layer 270 by surface tension.

Through the above process, any one of red, green, and blue fluorescent layers required in the PDP substrate are formed. Therefore, by repeating the above two times on the surface between the partition walls where the fluorescent layer is not formed, it is possible to form all of the formation layers on the PDP substrate. At this time, if the space formed between the partitions 261 and the groove 211 using the injection substrate 210 corresponding to one-to-one, the plurality of grooves 211 is filled with phosphor pastes corresponding to red, green, and blue, respectively. After that, it is possible to form all of the forming layers on the surface of the substrate through a single process.

3 is a schematic view for explaining a fluorescent layer patterning method of a plasma display panel using a separate absorption jet substrate and a laser according to the present invention. As shown in FIG. 3, the absorption jet substrate 310 of this embodiment is a mask plate having a plate 311 in a detachable form and a plurality of holes 313 forming a plurality of grooves in close contact with the plate 311. 312. At this time, the flat plate 311 and the mask plate 312 are made of a material such as a metal, ceramic, or the like, which absorbs the laser without raising the laser and rises in temperature. Therefore, in order to use the absorption jet substrate 310, the flat plate 311 and the mask plate 312 may be used while being in close contact with a magnet or vacuum.

In this case, when the absorption jet substrate 310 is configured as a separate type, the structure is more complicated than that of the integrated type as shown in FIG. 2, but the cleaning process for removing the phosphor paste remaining on the mask plate 312 is easy. . In addition, various holes 313 of the mask plate 312 may be etched, laser drilled, punched, electro-formed, or the like to match the space between the partitions 361 of the PDP substrate 360. There is an advantage that can be processed precisely by the method. At this time, a plurality of holes 313 are formed for every three spaces formed between the partitions 361 of the PDP substrate 360. That is, the plurality of holes 313 have a form in which every three spaces formed between the partition walls are formed so as to form a fluorescent layer of any one of red, green, and blue colors required in the PDP substrate at one time. However, the plurality of holes 313 may be formed in a one-to-one correspondence to a space formed between the partition walls 361 or arranged one by one for every three multiples of the space.

In order to form the fluorescent layer 370 on the plasma display panel using the separate absorption jet substrate 310 and the laser 340 configured as described above, the same process as described above may be performed. In FIG. 3, reference numeral 320 denotes a phosphor paste in which phosphor powder, a binder, and a solvent are mixed, 330 denotes a squeegee, and 350 denotes bubbles.

4 is a schematic diagram illustrating a fluorescent layer patterning method of a plasma display panel using an integrated transmission substrate and a laser according to the present invention. As shown in FIG. 4, the permeation jet substrate 410 of this embodiment is integrally formed in a flat plate shape, and a plurality of grooves 411 are formed at a predetermined interval on one surface thereof. The transmission jet substrate 410 is made of a material that passes the laser, such as glass or high temperature plastic.

Therefore, when the laser 440 is irradiated on one surface of the transmission jet substrate 410 in the same manner as described above, the laser 440 penetrates the transmission jet substrate 410 to directly fill the phosphor paste 420 filled in the groove 411. By heating, the phosphor paste is sprayed onto the surface between the partition walls 461 of the PDP substrate 460 to form the phosphor layer 470. In FIG. 4, reference numeral 450 denotes a bubble.

5 is a schematic diagram illustrating a fluorescent layer patterning method of a plasma display panel using a separate transmission substrate and a laser according to the present invention. As shown in Fig. 5, the transmission jet substrate 510 of this embodiment is composed of a mask plate 512 having a plurality of holes 513 at a predetermined interval from the flat plate 511 in a detachable manner. At this time, the flat plate 511 and the mask plate 512 is made of a material that allows the laser to pass through, such as glass or high temperature plastic. Therefore, in order to use the permeation jet substrate 510, the flat plate 511 and the mask plate 512 may be used in a state in which the flat plate 511 and the mask plate 512 are in close contact with each other.

That is, when the laser 540 is irradiated on one surface of the transmission jet substrate 510 in the same manner as described above, the laser 540 penetrates the flat plate 511 to directly direct the phosphor paste 520 filled in the hole 512. By heating, the phosphor paste is sprayed on the surface between the partitions 561 of the PDP substrate 560 to form the phosphor layer 570. In FIG. 5, reference numeral 550 denotes a bubble.

In the above-described embodiments, a method of patterning a fluorescent layer on the surface of a substrate using a plasma display panel as an example has been described. However, the present invention has various shapes such as color filter (LCD) on the surface of a flat panel display device such as liquid crystal display (LCD), organic light emitting diode (OLED), etc. other than PDP depending on the shape of the groove of the injection substrate. Image patterning is possible. That is, after filling the patterning material (including paste) forming the image in the groove of the injection substrate of the above-described embodiments, it is possible to pattern the image in the same manner as the above-described embodiments.

The present invention adopts a non-contact method of injecting a patterning material applied to a spray substrate onto a substrate surface through laser heating, thereby simplifying the device and injecting a patterning material uniformly filled into a plurality of grooves or holes by laser heating. As a result, a uniform image or fluorescent layer patterning can be formed at high speed, thereby improving product quality and productivity.

In addition, the present invention can increase the economical efficiency because the spraying substrate can be cleaned and used again after performing the patterning process once, and the patterning material filled in the grooves or holes of the spraying substrate is sprayed. The loss can be minimized.

In addition, the present invention aligns the spray substrate with the substrate of the display device once to eject the patterning material applied to the entire groove or hole of the spray substrate, thereby minimizing the time required for alignment. For example, when using a jet substrate having grooves arranged in every three spaces formed between the partition walls of the PDP substrate, only three alignments are necessary to form the red, green, and blue fluorescent layers required for the PDP substrate. Minimize the time spent on sorting.

In addition, since the present invention only needs to heat the injection substrate or directly heat the patterning material, a variety of general-purpose lasers may be used. Accordingly, inexpensive laser equipment can be used, thereby reducing the cost.

The technical details of the patterning method of the display device of the present invention have been described above with the accompanying drawings, but this is only illustrative of the best embodiment of the present invention and is not intended to limit the present invention.

It is also apparent that any person skilled in the art can make various modifications and imitations within the scope of the appended claims without departing from the scope of the technical idea of the present invention.

Claims (11)

Filling and applying a patterning material containing paste into each groove of the spray substrate having a plurality of grooves; Aligning one surface to which the patterning material is applied to an upper surface of the substrate surface of the display device; and Irradiating a laser on the other side of the jet substrate to heat the patterning material, and accordingly spraying the patterning material onto the substrate surface of the display device at a pressure of bubbles generated in the patterning material, thereby patterning the patterned material; Repeating the steps one or more times to form all desired patterning on the substrate surface of the display device. The method according to claim 1, The display device is a plasma display panel (PDP) patterning method, characterized in that the. The method according to claim 1, And the display device is a liquid crystal display (LCD). The method according to claim 1, The display device is a patterning method of a display device, characterized in that the organic light emitting diode (OLED). The method according to claim 1, The spraying substrate is a patterning method of the display device, characterized in that integrally configured. The method according to claim 5, And the injection substrate is made of a laser absorbing material to indirectly heat the patterning material with the laser. The method according to claim 5, And the injection substrate is made of a laser transmitting material to directly heat the patterning material with the laser. The method according to claim 1, And the ejection substrate is separated and includes a flat plate and a mask plate having a plurality of holes to form the grooves in close contact with the flat plate. The method according to claim 8, And the flat plate is made of a laser absorbing material to indirectly heat the patterning material with the laser. The method according to claim 8, And the flat plate is made of a laser transmitting material to directly heat the patterning material with the laser. The method according to claim 2, The plurality of grooves may have a shape in which a plurality of grooves are arranged every three spaces formed between the partition walls of the PDP so as to form fluorescent layer patterning of any one of red, green, and blue colors necessary on the surface of the PDP substrate. Patterning method.

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