KR100690338B1 - The method and the device for cutting the flat display glass panel, which use the laser - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser cutting method and apparatus for a flat panel display glass panel, wherein a multi-layered LCD panel or a plasma gas into which two glasses (color substrate and electrode substrate) are bonded together with a liquid crystal interposed therebetween. When cutting the panel, defects such as glass fragments, cracks and scratches are minimized, as well as multi-layer cutting and simultaneous cutting of the upper and lower panels with different cutting areas, and cutting of the upper and lower glass at the stage before glass panel bonding. The present invention relates to a flat panel display glass panel laser cutting method and apparatus that can more precisely and easily cut to contribute to more precise / good cutting quality, productivity, and process reduction.

That is, in the flat display glass panel, one glass selected from the glass color substrate 10 and the lower electrode substrate 20 or the color substrate 10 and the lower electrode substrate 20 are bonded together up and down. Necessary standard for cut-in and laminated two-layered PDP panel of glass panel (3a) before bonding LCD panel (1) of layer structure or PDP panel (17 inch, 19 inch, 30 inch…) In the cutting along the cutting area (C) determined by the laser beam slab on the bottom surface of the cut glass (10, 20) or the two-layer flat display panel cutting area (C) bonded to the cutting object (절단 光 版, 110), and a concave-type gray plate is installed on the upper surface of the glass panel, and then the high power yag laser beam 100 in the near infrared section is scanned above the cutting area C to increase the concentration of the laser beam and to contract. The difference in stress between the surface of the glass and the center of expansion It is produced so that it can be efficiently cut and finally cut.

Yag laser, flashing plate, non-contact cutting, complete cutting, step cutting, glass, liquid crystal display

Description

The method and the device for cutting the flat display glass panel, which use the laser}

1 is a view illustrating a first embodiment of a cutting method of the present invention

Figure 2 is an exemplary view of a second embodiment of the cutting method proposed in the present invention

Figure 3 is a third embodiment of the cutting method proposed in the present invention

4 is a plan and side cross-sectional view showing a schematic structure of a flat panel display panel

5 is an exemplary view showing a preferred embodiment of the present invention.

6 is an exemplary view showing a preferred embodiment of the present invention.

7 is an exemplary view showing a preferred embodiment of the present invention.

8 is an exemplary view showing a preferred embodiment of the present invention.

9 is a reference diagram showing a state when the flat upper luminescent plate is applied

10 is a reference diagram showing a state when the concave upper luminescent plate is applied.

■ Explanation of the major symbols used in the main parts of the drawings ■

1 LCD glass panel 10 Upper glass disc

11: reflection medium 12: auxiliary reflector

20: lower glass disc 100: Yag laser beam

110: lower slab 110a: upper slab

C: Cutting area 3a: PDP

The present invention relates to a method and apparatus for cutting a flat panel display glass panel using a concave gray steel plate. More specifically, a liquid crystal display having a multi-layered structure in which two glasses (color substrate and electrode substrate) are bonded together with a liquid crystal interposed therebetween. The glass panel (liquid crystal panel) or PDP panel increases the concentration of laser penetration more than the conventional glass panel cutting, which is faster and minimizes defects such as glass fragments, cracks and scratches. The present invention relates to a method and apparatus for cutting a flat panel display panel, which enables the step cutting and simultaneous cutting of the panel to be carried out collectively, and the cutting surface is precisely / good.

A typical liquid crystal display glass panel (hereinafter, abbreviated as "liquid crystal panel") is a color substrate having a color filter and an electrode substrate (TET substrate) having an electrode pattern formed thereon, as shown in the drawing. On the other hand, the X-axis and Y-axis terminal portions of the above-described configuration have longer and longer lengths in the upper and lower color substrate portions, as shown in FIG. It has a structure in which a stepped glass step portion is formed, which is formed in a virtual step.

The upper and lower color substrates and the electrode substrates of the liquid crystal panel having such a configuration may be obtained by cutting the respective original glasses by the required sizes (17 inches, 19 inches, 21 inches, 30 inches, etc.), respectively, and then joining them. In contrast,

The original boards of the color board and the electrode board are bonded together, and then the liquid crystal panel plates in the bonded state are cut to the required size (17 inches, 19 inches, 21 inches, 30 inches, etc.) In this regard, the effects of process and cost savings are expected to become universal.

In addition, in the case of the PDP panel, it is common to cut the upper and lower glass panels to the required size (17 inches, 19 inches, 21 inches, 30 inches ....). Therefore, first, the upper and lower glass are cut and bonded to each other to form a PDP panel.

At this time, the conventional cutting method used is to cut the upper and lower glass discs of the LCD and PDP panel by using a diamond wheel, firstly cutting a predetermined depth along the area to be cut, and then applying a predetermined impact thereto to induce cracking. Diamond wheel cutting is a typical example.

However, this method is contaminated by the scattering of fine glass fragments generated during the diamond wheel rotation and cutting, and some parts are contaminated and the other parts are stuck to the left and right sides of the glass cutting surface around the cutting surface to form defective particles or cracks or scratches. As this occurs, as a separate post-treatment process such as a polishing process or a cleaning process is required, production efficiency is lowered and the quality of the cut surface is greatly reduced.

In addition, due to the generation of static electricity, breakage, etc. that may accompany the after-treatment process, there was a problem that the defects of the LCD products and the quality deterioration were greater.

In addition, the above-described diamond wheel cutting method is configured by cutting each original plate through two separate processes as described above, and then bonding them together, or turning the original plate of the color substrate and the electrode substrate of the already bonded phase and turning it upside down again. At least two cycles of cutting, such as cutting the other side again, require a great deal of damage in handling, and above all, the productivity and price competitiveness are weakened.

Therefore, a number of cutting methods using laser have been developed. In the case of cutting method using CO2 laser, the glass panel is not completely cut by a single process. There was a hassle to make a final cut with pressure.

Therefore, in the situation where a number of technologies for the precision cutting method using a laser with high precision of cutting are being developed at present, the laser cutting technology is a cutting technology that has not been easily used in the past. There is an urgent need for the development of technology to enable this.

Accordingly, the present invention has been devised to solve the above problems, and in particular, implements a non-contact cutting method to minimize various defect factors (chip, particle, crack, or scratch) that may occur when cutting the glass panel. At the same time, in order to achieve more efficient cutting using a yag laser, the concave type top-illumination plate is applied to increase the concentration of laser penetration, thereby establishing the optimum condition and configuration of the non-contact cutting method and the flat panel display panel (LCD panel). , PDP panel, etc.) or a flat panel display glass panel cutting method and apparatus that can perform the work more precisely and efficiently when cutting the upper and lower original glass in one process before bonding. It is completed as.

In order to achieve the above technical problem, the present disclosure will be described in more detail based on the accompanying drawings.

The LCD panel in the flat panel display as an example,

<Example 1>

As shown in FIG. 1, a glass substrate of the liquid crystal panel 1 is selected from an upper color substrate (hereinafter referred to as an upper glass disc) 10 and a lower electrode substrate (hereinafter referred to as a lower glass disc) 20. Standard required for the liquid crystal panel 1 of one glass or a two-layered structure in which the upper glass disc 10 and the lower glass disc 20 beneath are joined together (17 inches, 19 inches, 30 inches). ..... etc.) in cutting along the defined cutting area (C),

The laser beam luminescent plate 110 is installed on the lower and upper glass discs 10 and 20 or the two-layered liquid crystal panel 1, which is the cutting object C. The high power yag laser beam 100 is scanned above the region C to completely cut it.

As such, when the YAG laser beam 100 is concentrated and scanned at the target when the glass component of the liquid crystal panel 1 is cut,

The primary thermal stress is generated on the glass cross section of the cut zone C according to the heat absorption of the glass, and the secondary thermal stress and the repetition of the multiple times due to the reflection of the transmission beam by the bottom panel 110 are repeated. Accumulated heat stress is generated according to the number of repetitions, so that a good cut surface can be obtained with excellent processing surface and no contamination of glass.

That is, as shown in the glass, the yag laser beam 100 scanned in the liquid crystal panel glass absorbs only a certain amount and transmits the rest according to the thermal absorption heat of the glass 1, 10, 20.

At this time, the predetermined amount of the yag laser beam 100 reflected by the gray plate (回 光 版, 110) installed on the bottom is turned back upward, and the secondary yag laser beam is secondarily scanned on the glass to absorb some repetition. ,

In addition, this is again reflected by the concave upper luminescent plate 110a provided in the laser beam head 101, and the third laser beam is repeatedly scanned again on the glass 1, 10, 20 as the cutting object. , Thermal stress and thermal stress accumulate in the cutting zone and cause cracks,

As a result, a high quality complete cut surface is obtained that is smooth and particles do not occur along the cut area of the laser beam scanned glass.

<Example 2>

And the upper and lower two-layered liquid crystal panel 1 can be cut together at once, but the X-axis terminal portion 21 and the Y-axis terminal portion of the electrode substrate portion drawn longer than the upper glass original portion 10. In order to form the upper and lower stepped glass steps 23 of (22), the upper and lower cutting regions C may be stepped differently from each other.

In this case, the reflective medium 11 is formed on the back side of the cut region of the upper glass disc 10 so that the beam 100 may have the X-axis terminal portion 21 or Y of the lower glass disc 20 of the upper glass disc 10. After preventing the transmission to the shaft terminal portion 22, by cutting the yag laser, it is possible to cut the upper glass disc 10 safely.

On the other hand, when cutting the lower glass disc 20, the laser beam 100 is focused on the lower glass disc 20 by scanning the focal point of the laser beam 100 on the surface or the end face of the lower glass disc 20 below the upper glass disc 10. By allowing the thermal stress and the repeated thermal stress due to the bottom plate to be continuously applied, perfect step cutting may be achieved.

In addition, as described above, one laser head may be reciprocated to cut the upper glass disc 10 and the lower glass disc 20 below.

Two laser heads 101 are respectively provided on the upper and lower portions of the panel bonded to each other at a predetermined interval so that the upper and lower portions of the upper glass lower plate 10 and the lower glass lower plate 20 are cut at the same time. In the case of scanning the laser beams 100, the step cutting may be processed in one step. In this case, the cutting time may be further reduced.

<Example 3>

In addition, when cutting the upper glass disk 10 of the upper end of the liquid panel (1) by inserting a separate auxiliary reflector 12 between the upper glass disk 10 and the lower glass disk 20 of the lower side by inserting the upper The beam transmitted after being scanned on the color substrate may be repeatedly reflected as many times as in Example 1 to obtain a higher cutting efficiency.

In this case, the sub-reflective plate 12 should be focused on the lower glass original plate 20 after the laser beam 100 has passed through the upper glass original plate 10 when the lower glass original plate 20 is cut. After cutting the original plate 20 firstly, only when cutting the upper glass circle plate, the panel 20 is automatically or manually inserted between the panels 1 to allow the reflective action.

In addition, in view of the fact that the height of the auxiliary reflector 12 is extremely narrow between the color substrate 10 and the electrode substrate 20 of the liquid crystal panel 1, a thin thickness of the gray plate should be selected. It is desirable to use a special material that is very high and has excellent heat resistance.

Next, the PDP panel in the flat panel display panel will be described as an example.

In the case of the PDP panel, the upper glass disc and the lower glass disc to be bonded are preferably cut to a standard size (17 inches, 19 inches, 30 inches, etc.) and then bonded together.

In this case, cutting is performed through the same method as mentioned in the embodiment of the LCD panel, and as shown in FIG. 5, the YAG laser beam 100 scanned on the upper and lower glass discs before the bonding of the PDP panel is shown. Only a certain amount is absorbed according to the thermal absorption rate of the glass disc 3a, and the rest is transmitted. At this time, the predetermined amount of the laser beam 100 reflected by the lower reflector 110 installed on the bottom is again upward. And the light is continuously transmitted through the glass, and is partially absorbed by the glass, and is continuously reflected by the concave upper reflector 110a (upper reflector) included in the laser beam head 101. As the light is repeatedly transmitted between the glass objects 3a by the reflection process, thermal stress and stress accumulate in the cutting region, which causes cracks, resulting in cutting of the laser beam. We'll have a high-quality full cut accordingly.

As mentioned in the above-mentioned embodiment, even when the PDP panel is bonded to each other, it can be cut by performing the same method as the cutting method of the LCD panel.

In the configuration and method mentioned in the above embodiment, the characteristic components will be described in more detail.

As shown in FIG. 6, the upper upper reflector 110a (upper reflector) may be configured to cut the flat panel display panel, thereby maximizing the reflection power of the yag laser, and the upper panel 110a ( The upper reflector is to reciprocate the laser beam to cut the difference of energy accumulation and thermal stress. The upper reflector 110a is concave to narrow the reflection angle of the reciprocating beam to concentrate the beam path on the glass. It is possible to cut the flat panel display glass more efficiently by increasing the energy absorption efficiency. In the case of the upper luminescent plate 110a, it is applied using a high glass material, such as the reflecting power of the laser beam, such as the lower luminescent plate 110a, and is configured below the laser beam head 101 so that the laser can be transmitted. The penetrating portion 113 is configured. Therefore, the laser beam transmitted through the penetrating portion repeatedly moves between the lower gray plate 110 and the upper gray plate 110a. In this process, the upper steel plate 110a is used to narrow the reflection angle of the laser beam as much as possible. It is configured to be concave to cut thermal stress and thermal stress of the flat panel display glass efficiently.

The graph showing the energy transmission concentration of the yag laser and the energy absorption amount of the sample when the upper concave gray plate 110a or the flat plate of the flat plate is applied as described above is compared with reference to FIGS. 9 and 10. The difference in the energy concentration can be seen when the gray-plate and the concave-colored plate are used. The figures are graphs and drawings showing energy distribution and concentration under the same conditions of the top-plate position and the YAG laser. When the concave gray plate is used, the refractive angle of the yag laser is more concentrated in one place, so that the temperature and energy absorption in the cutting region are high, so that cutting can be more easily performed.

In this case, in the laser beam generated from the laser beam head 101 and transmitted to the penetrating portion 113 of the upper steel plate 110a, a lens is integrated to integrate the laser into the laser beam head 101. By penetrating through the penetrating portion 113 it may be possible to efficiently spray the laser. That is, as shown in FIG. 7, the lasers generated first into the laser beam head 101 are horizontally irradiated with a collimating lens 103 and then, again through a focusing lens 105. By focusing to the outside and focusing on it, the energy of the generated laser can be utilized to the maximum, and the energy of the laser irradiated to the cutting of the flat panel display can be used efficiently.

Therefore, the repeating transmittance and cutting process of the PDP panel glass of the flat panel display glass with reference to Figure 8 in more detail, Figure 8 (a) is a description of the absorption of the Yagra laser by applying a 2mm PDP panel glass Looking at the transmittance, in the first transmission, about 15% of energy is accumulated in the 2 mm PDP panel glass and the rest is penetrated. Therefore, energy is accumulated at the above ratio during repeated transmission.

As a result, as shown in (b), energy is accumulated in the flat display glasses subjected to the laser irradiation to cause the glass to expand, and the surface temperature of the glass cross section is relatively lowered due to the laser beam moving at a constant speed. The central part, which is not cooled compared to the surface, is expanded, and in the region where the laser beam is irradiated, a stress difference occurs between the surface and the center of the expanding glass, causing cracks in the glass and cutting.

In the present invention, the peripheral components of the flat panel display glass panel laser cutting method and apparatus can be cut more efficiently and efficiently than the conventional ones by cutting the yag laser, and defects such as debris, cracks or scratches In addition to providing a high-quality cutting surface with minimal minimization, there is no need for post-treatment processes such as polishing and cleaning, which were previously required, so that the process can be saved and the overall cost saving effect can be obtained. It is possible to apply separate cutting and full cutting to glass panels as needed, which greatly contributes to productivity improvement, and is expected to be an excellent clean cutting method in which non-metallic non-contact cutting minimizes the occurrence of contamination.

Claims (11)

Standardized size of the glass component of the flat panel display panel, one glass selected from the upper glass plate and the lower glass plate, or the two-layer flat panel glass panel of the upper glass plate and the lower glass plate In cutting along a cutting area of 17 inches, 19 inches, 30 inches ...), After installing the laser beam luminescent plate 110 on the bottom of the cut area of the glass original plate (10, 20, 3a), or the two-layer flat panel display panel bonded to the cutting object, high power of the near infrared section above the cut area Flat panel display glass panel laser cutting method comprising scanning the yag laser beam 100 to be completely cut The method of claim 1, The upper and lower glass plates are formed by forming a reflective medium 11 on the back surface of the cut region c of the upper glass disc, and scanning only the upper glass disc by cutting the laser beam 100. Flat panel display glass panel laser cutting method comprising the step of separating each of the steps to enable cutting. The method of claim 1, When cutting the upper glass disc of the two-layered flat panel glass panel, a separate auxiliary reflector 12 is inserted between the upper glass disc and the lower glass disc to insert a yag laser into the upper glass disc 10. A flat panel display glass panel laser cutting method comprising scanning and cutting. The method of claim 1, Laser energy generated by the laser beam head 101 is horizontally irradiated with a collimating lens and then focused again by focusing to the outside through a focusing lens to focus energy. Flat panel display glass panel laser cutting method comprising the maximum utilization to increase the cutting efficiency. The method of claim 1, Flat panel display panel laser cutting method comprising the LCD, PDP disc glass panel or laminated panel The method of claim 1, Flat display glass including separating and cutting the laser reflecting only the upper glass plate by inserting the auxiliary reflecting plate 12 between the glass plate to combine the glass plate of the upper portion of the LCD, PDP bonding panel selectively Panel Laser Cutting Method The method according to any one of claims 1 to 6, The upper display panel 110a is formed on the upper side of the flat panel display panel so that the laser reflected from the lower panel is reflected back to the lower panel, thereby repeatedly reflecting to enable efficient use of the laser. Glass Panel Laser Cutting Method The method of claim 7, wherein The upper panel 110a is formed in a concave shape, the flat panel display panel laser cutting method comprising a laser reflected from the lower panel 110 to accumulate and reflect back to the lower panel 110 A laser beam head 101 for generating a laser, In the flat panel display glass panel laser cutting device comprising a configuration consisting of a lower light emitting plate 110 which is located at the lower portion of the flat panel display glass panel to be cut to reflect the transmitted laser upwards, The upper portion of the flat plate display glass panel to efficiently utilize the laser by repeatedly passing the laser beam reflected from the lower panel 110 to the lower panel 110 to reflect the laser repeatedly reciprocating Flat display glass panel laser cutting device comprising a furnace concave upper panel 110a The method of claim 9,  Focusing lens to configure a collimating lens to horizontally irradiate the first laser generated inside the laser beam head 101 to pass through the laser, and to focus it again to focus outward (focusing lens) Flat panel display glass panel laser cutting device comprising continuously configuring a focussing lens) to transmit the laser through the cutting to maximize the energy of the laser generated. The laser beam head 101 for generating a laser is formed on the upper and lower portions of the cut flat panel display glass panel, respectively. Flat panel glass panel laser cutting comprising the upper and lower laser beam head 101 and each of the flat panel display panel to cut the laser to reciprocate between the laser plate and to perform cutting Device

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