KR100742994B1 - Method for manufacturing back light unit - Google Patents

Abstract

A method for manufacturing a backlight unit is provided to simplify the manufacturing process and shorten the manufacturing time, by continuously performing an exhaust process, a heating process, and a discharge gas injecting process within a vacuum chamber. An upper plate and a lower plate for a backlight are prepared(S1). An exhaust tube and mercury getter injection tube is formed(S2). The upper plate and the lower plate are aligned under normal pressure and clipped to produce one panel, and the exhaust tube and mercury getter injection tube is fixed at one side of the lower substrate(S3). Air within the panel is vacuumized after putting the clipped panel in a vacuum chamber, and the exhaust tube and mercury getter injection tube is attached to the lower substrate of the clipped panel(S4). A discharge gas is injected within the clipped panel through the exhaust tube and mercury getter injection tube(S5). A tip portion of the exhaust tube and mercury getter injection tube is firstly sealed off(S6). The sealed panel is drawn out from the vacuum chamber, and transferred to a constant pressure furnace(S7). A mercury getter is heated and activated(S8). Mercury is diffused within the panel through the activated mercury getter(S9). The tip portion of the exhaust tube and mercury getter injection tube is secondarily sealed off(S10).

Description

Manufacturing Method for Backlight Unit {Method for Manufacturing Back Light Unit}

1 is a view showing a process of a method for manufacturing a backlight unit according to the present invention,

2 to 11 are process model diagrams for explaining each process according to the manufacturing method of the present invention.

<Description of the symbols for the main parts of the drawings>

10: vacuum chamber 11: top plate

12: bottom 13: clip

20: exhaust pipe and the mercury getter injection tube 21: tube body

22: mercury getter 30: gas injection device

31: Chuck 32: O-Ring

33: sealing heater 35: heating device

The present invention relates to a method for manufacturing a backlight unit, and more particularly, the time required for the entire process while simplifying the process by continuously performing the exhaust and sealing process of the panel and the injection process of the discharge gas in the vacuum chamber. It relates to a method of manufacturing a backlight unit that can significantly reduce the.

A backlight unit is used to illuminate a display unit such as a liquid crystal display (LCD), which is widely used at present.

Referring to the general manufacturing method of the backlight unit as described above, as follows.

First, the upper and lower plates to be used as the BLU is aligned and clipped, and the upper and lower plates are integrally formed by heating and sealing them under normal pressure, thereby forming a tubular discharge passage between the upper and lower plates. In addition, the mercury getter injection tube and the upper and lower mercury getter tubes can be injected into the upper and lower plates which are integrally sealed by heating and sealing the exhaust pipe / mercury getter injection tube at the bottom of the lower plate using a frit glass under normal pressure. An exhaust pipe for exhausting the impurity gas inside the plate and injecting the discharge gas is integrally formed with the upper and lower plates.

Next, the mercury getter is injected into the integrally formed mercury getter injection tube, the tip of the mercury getter injection tube is first tip-off, the sealed upper and lower panels are transferred to the exhaust system, and the exhaust pipe is evacuated using an exhaust pipe. Tip off first.

Subsequently, the mercury getter is heated to be activated to allow the activated mercury gas to diffuse into the sealed vacuum panel, and then the exhaust pipe / mercury getter injection tube is secondly tipped off to complete the backlight unit.

In the conventional method of manufacturing a backlight unit through the above process, first, the gas inside the panel is evacuated after sealing the upper plate and the lower plate under normal pressure, so that exhausting takes a long time, which causes a stagnation in the flow of the whole process. It has been pointed out as the biggest obstacle to increase the productivity of the backlight unit, and secondly, the panel sealing and exhausting process and the injection of the discharge gas are performed in separate chambers, and the inconvenience of moving each process And a long time accordingly, and thirdly, injecting a discharge gas into the panel and diffusing mercury into the panel in a later process, first cooling the panel temperature to room temperature and then diffusing the mercury again. This process of cooling and reheating is because the panel is heated to about 300 ~ 350 ℃ to facilitate Stand so many times it came to be secured is a factor delaying the entire process, and therefore should have in the process to separate the mercury diffusion equipped there is a problem in the equipment becomes larger and the process is complicated accordingly.

The present invention has been made in order to solve the above problems, the object of the exhaust and heating process and the discharge gas injection step to be carried out continuously in the vacuum chamber, the exhaust and heating step and the discharge gas injection step respectively The backlight unit can improve productivity by significantly reducing the time required for the entire process while simplifying the process by preventing the troublesome movement of the panel and the long time required by the separate chamber. To provide a method of manufacturing.

Another object of the present invention is to reduce the time and energy required to reheat the panel by performing the mercury diffusion process without cooling the panel temperature to room temperature in the exhaust and mercury diffusion process The present invention provides a method for manufacturing a backlight unit.

Method for manufacturing a backlight unit according to the present invention for achieving the above object is the upper plate and lower plate forming step (S1) for forming the upper and lower plates for the backlight, respectively; A step (S2) of forming an exhaust pipe and a mercury getter injection tube made of a tube body having an outer wall of which an upper part and an lower part are opened, and a mercury getter inserted into an inner portion of the tube body; The upper plate and the lower plate formed in the step (S1) are superimposed and aligned under normal pressure, and the edges are pressed and fixed with a clip to be bonded to one panel, and the step (S2) is formed in the through hole formed on one side of the lower plate. An alignment and clipping process of fixing the exhaust pipe and the mercury getter injection tube formed at (S3); The panel clipped in the step (S3) is introduced into a vacuum chamber, and then while the panel is heated under vacuum, the gas inside the panel is evacuated through a gap of the frit glass for sealing the upper plate and the lower plate, and then pressurized. Sealing and exhausting and sealing the heat-sealing process using frit glass on the through-hole formed near the lower end of the lower plate and the mercury getter injection tube (S4); In the step (S4), a gas injection device is connected to the exhaust pipe and the mercury getter injection tube heat-sealed in the lower part of the panel, and discharge gas is introduced into the panel through the exhaust pipe and the mercury getter injection pipe by the gas injection device. Injecting discharge gas injection step (S5); A first tip off step (S6) of sealing the tip of the exhaust pipe and the mercury getter injection tube; In the step (S6) the atmospheric pressure furnace transfer step (S7) for removing the heat-sealed panel of the exhaust pipe and the lower portion of the mercury getter inlet pipe from the vacuum chamber and transported to the atmospheric pressure furnace; A mercury getter activation step (S8) of activating the mercury getter by heating the mercury getter using a heating apparatus attached to the outer circumference of the exhaust pipe and the mercury getter inlet tube at atmospheric pressure; A mercury diffusion step (S9) in which mercury diffuses into the vacuum-sealed panel by the mercury getter activated in the step (S8); And a secondary tip off step (S10) of sealing the tip of the exhaust pipe and the mercury getter injection tube (S10).

Here, it is preferable that an atmospheric heating step is further added between the step (S3) and step (S4) to raise the panel to 300 to 350 ° C primarily under normal pressure.

Here, the mercury diffusion step (S9) is preferably carried out in an atmospheric pressure furnace for 2 hours at a temperature of 300 ~ 350 ℃.

Hereinafter, a method of manufacturing a backlight unit according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a process of the manufacturing method of the backlight unit according to the present invention, Figures 2 to 11 is a process model for explaining each process according to the manufacturing method of the present invention shown in FIG. Drawing.

First, the manufacturing method of the backlight unit according to the present invention, as shown in Figure 1 upper and lower plate forming step (S1), exhaust pipe and mercury getter injection tube forming step (S2), alignment and clipping process (S3), exhaust and sealing Process (S4), discharge gas injection process (S5), primary tip off process (S6), atmospheric furnace transfer process (S7), mercury getter activation process (S8), mercury diffusion process (S9), and secondary tip off Process (S10) consists of each step performed sequentially.

First, the upper plate and the lower plate forming step (S1), as shown in Figure 2, the upper plate 11 and the lower plate 12 for backlight is formed, respectively, the upper plate 11 and the lower plate (circumference around the edge of the lower plate 12 ( A frit glass (not shown) having a low melting point property for sealing 12) is applied.

In addition, the exhaust pipe and the mercury getter injection tube forming step (S2) is formed in the exhaust pipe and the mercury getter injection tube 20 which is attached to the through-hole side formed near the lower end of the lower plate 12 as shown in FIG. .

The exhaust pipe and the mercury getter injection tube 20 is composed of a tube body 21 having an outer wall of which the upper and lower portions are opened, and a mercury getter 22 inserted into an inner point of the tube body 21.

Next, in the alignment and clipping process (S3), as shown in FIG. 3, the upper plate 11 and the lower plate 12 formed in the upper plate and the lower plate forming step S1 overlap and align under normal pressure, and the edges thereof are illustrated. As shown in Fig. 4, the exhaust pipe and the mercury getter formed in the step (S2) are formed in the through hole formed on one side of the lower plate 12 by being fixed by pressing by a fixing means such as a clip 13. Fix the injection tube 20.

As a next step, the evacuation and encapsulation step S4 is carried out by placing the panel clipped in the alignment and clipping process S3 into the vacuum chamber 10 as shown in Fig. 5, and then heating the panel under vacuum. The gas inside the panel is evacuated through a gap of a frit glass (not shown) for sealing the upper plate 11 and the lower plate 12 and then pressure-sealed, and further, the exhaust pipe and the mercury getter injection tube 20. Is heated and sealed using a frit glass (not shown) in the through hole formed near the lower end of the lower plate 12.

The heating of the panel in the step (S4) is for melting the frit glass located between the upper plate 11 and the lower plate 12 to fuse the upper plate 11 and the lower plate 12, the exhaust process is completely fusion It proceeds through a minute gap formed between the surface curved surface of the previous frit glass and the upper plate 11 and the lower plate 12 in contact with it, and after the vacuum exhaust process is completed, the upper plate 11 and the lower plate 12 ) Is pressed under vacuum.

On the other hand, the heating for sealing the panel in the step (S4) is typically performed until the temperature reaches approximately 450 ℃, in order to shorten the heating time of the panel and to minimize the temperature non-uniformity acting on the panel Some heating sections may be performed at atmospheric pressure instead of inside the vacuum chamber 10, in which case, the heating is performed until the temperature reaches 300 to 350 ° C. The reason for performing the atmospheric heating process up to 300-350 ° C. is that the degassing of moisture and impurity gas adsorbed inside the panel is most smoothly near this temperature range, so that the exhaust is concentrated, thereby improving the exhaust characteristics by the atmospheric pressure environment. Therefore, the temperature of the panel is increased under normal pressure, in which the temperature characteristic of the panel is represented by a small deviation of about 10 ° C./min on the basis of a temperature increase of ± 5 ° C., thereby increasing the gas activity inside the panel, and then for a predetermined time. Keeping the vacuum in the inside, it is possible to heat up the temperature and high vacuum inside the panel in a short time compared to the past.

Next, the discharge gas injection step (S5) is connected to the gas injection device 30, as shown in Figure 6 to the exhaust pipe and the mercury getter injection tube 20 heat-sealed to the bottom of the panel in the step (S4) and The discharge gas is injected into the inside of the panel through the exhaust pipe and the mercury getter injection tube 20 by the gas injection device 30.

The gas injection device 30 is connected using a chuck 31 and the like which are covered on the outer circumference of the exhaust pipe and the mercury getter injection tube 20, and the chuck 31 is connected to the exhaust pipe and the mercury getter injection tube 20. The O-ring 32 or the like is mounted so that airtightness is maintained between the outer periphery of the &quot;

Subsequently, in the discharge gas injection process (S5), the panel in which the discharge gas is injected into the panel is completed to open the exhaust pipe and the mercury getter injection tube 20 to move out of the vacuum chamber 10 to a subsequent normal pressure furnace. As shown in FIG. 6, the first tip-off process S6 of heat-sealing the tip part using a heating device such as the folding heater 33 is performed.

In the first tip off step (S6), the panel in which the tip portion of the exhaust pipe and the mercury getter injection tube 20 are heat sealed is taken out of the vacuum chamber 10 and transferred to an atmospheric pressure furnace as shown in FIG. 7. The transfer process S7 is performed.

Next, the mercury getter activation step (S8) is a heating device 35 is attached to the outer periphery of the exhaust pipe and the mercury getter injection tube 20 in the normal pressure state as shown in Figure 8 specifically the coil of the high frequency heating source The mercury getter 22 located inside the coil is heated and activated by allowing a high frequency current to flow therethrough.

The mercury diffusion step S9 causes mercury to diffuse into the vacuum-sealed panel as shown in FIG. 9 by the mercury getter 22 activated in the step S8, and mercury is evenly distributed inside the panel. In order to diffuse, it is maintained for about 2 hours at a temperature of about 300 ~ 350 ℃.

Mercury diffusion process (S9) as described above is carried out in a normal pressure furnace after the panel is taken out from the vacuum chamber 10, compared to the conventional process, injecting the discharge gas into the interior of the panel, and then In order to perform the mercury diffusion process, it is not necessary to cool the panel temperature to room temperature and then reheat it to a temperature of about 300 to 350 ° C., thereby shortening time and saving energy. The mercury diffusion does not need to be.

Finally, in the secondary tip-off process (S10), after the mercury is diffused into the inside of the panel, the tip portion of the exhaust pipe and the mercury getter injection tube 20 by using a heating device such as a torch or a folding heater 37. Melt and cut to seal the panel as shown in FIG.

The method of manufacturing a backlight according to the present invention through the above process is to exhaust and seal the gas inside the panel in the vacuum chamber 10 and inject the discharge gas into the inside of the panel in the same vacuum chamber and then the panel It is made of a process for activating the mercury getter 21 to diffuse the mercury continuously in the atmospheric pressure furnace by transporting to the atmospheric pressure furnace so that the entire manufacturing process of the backlight unit can be easily and continuously performed through the vacuum chamber and the atmospheric pressure furnace. Therefore, the productivity is significantly improved by simplifying the manufacturing process and by shortening the time required for the entire process.

According to the method of manufacturing a backlight unit according to the present invention, the exhaust and heating process and the discharge gas injection process are continuously performed in the vacuum chamber, thereby performing the exhaust and heating process and the discharge gas injection process in separate chambers. It is possible to improve productivity by significantly reducing the time required for the entire process while simplifying the process by preventing the troublesome movement of the panel and the long time accordingly.

In addition, according to the method of manufacturing a backlight unit according to the present invention, in performing an exhaust process and a mercury diffusion process, the panel is reheated by performing a mercury diffusion process without cooling the panel temperature to room temperature between the processes and the processes. It can save time and energy consumption.

Although the present invention has been described with reference to the embodiments described above, it can be said that it is exemplary, and those skilled in the art can come up with various modifications and equivalent embodiments therefrom, such an equivalent implementation It is only natural that examples should also be regarded as included within the claims of the present invention.

Claims (3)

An upper plate and a lower plate forming process (S1) for forming the backlight upper plate 11 and lower plate 12, respectively; A step (S2) of forming an exhaust pipe and a mercury getter injection tube including a tube body 21 having an outer wall of which an upper part and an lower part are opened, and a mercury getter 22 inserted into an inner portion of the tube body 21; The upper plate 11 and the lower plate 12 formed in the step (S1) are superimposed and aligned under normal pressure, and the edge portion is pressed and fixed with a clip 13 to be bonded to one panel, and the lower plate 12 An alignment and clipping process (S3) for fixing the exhaust pipe and the mercury getter injection tube 20 formed in the step (S2) to the through-hole formed on one side of the; The panel clipped in the step (S3) is introduced into the vacuum chamber 10, and then the gas inside the panel is filled with frit glass for sealing the upper plate 11 and the lower plate 12 while heating the panel under vacuum. Exhaust and sealing by heat sealing by using a frit glass on the through hole formed near the lower end of the lower plate 12, and the pressure sealing after the vacuum exhaust through the gap and pressurized sealing. Step (S4); In the process (S4), the gas injection device 30 is connected to the exhaust pipe and the mercury getter injection tube 20 which is heat-sealed in the lower part of the panel, and the exhaust pipe and the mercury getter injection tube by the gas injection device 30. Discharge gas injection step (S5) for injecting the discharge gas into the inside of the panel through the (20); A first tip off step (S6) of sealing the tip of the exhaust pipe and the mercury getter injection tube (20); In the step (S6), the atmospheric pressure furnace transfer step (S7) for removing the heat-sealed panel in the lower portion of the exhaust pipe and the mercury getter injection tube 20 is taken out of the vacuum chamber (10); The mercury getter activation process of activating the mercury getter 22 by heating the mercury getter 22 using the heating device 35 attached to the outer circumference of the exhaust pipe and the mercury getter injection tube 20 in a normal pressure state (S8). ); A mercury diffusion step (S9) in which mercury diffuses into the vacuum-sealed panel by the mercury getter 22 activated in the step (S8); And And a secondary tip off step (S10) of sealing the tip of the exhaust pipe and the mercury getter injection tube (20). The method of claim 1, A method of manufacturing a backlight unit, further comprising an atmospheric pressure heating step of heating the panel to 300 to 350 ° C. first under normal pressure between the step (S3) and the step (S4). The method of claim 1, The mercury diffusion step (S9) is a manufacturing method of the backlight unit, characterized in that carried out in a normal pressure furnace for 2 hours at a temperature of 300 ~ 350 ℃.

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