Abstract:
A monomer vaporizing device and a method of controlling the same are disclosed. The monomer vaporizing device includes: a first vaporizer and a second vaporizer that receive a purge gas and vaporize a first monomer and a second monomer, respectively; a first flow pipe and a second flow pipe that are connected to the respective vaporizers and allow the first monomer and the second monomer, vaporized by the respective vaporizers, to flow therethrough; a transition tube that is connected to the first flow pipe and the second flow pipe and supplies at least one of the first monomer and the second monomer to a deposition chamber; and a control valve apparatus that regulates monomer flow into the deposition chamber. The device facilitates smooth and uninterrupted application of monomer to the interior of a deposition chamber.

Description:
CLAIM OF PRIORITY 
       [0001]    This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from an application for MONOMER VAPORIZING DEVICE AND METHOD) OF CONTROLLING THE SAME earlier filed in the Korean Intellectual Property Office on 6 Dec. 2012 and there duly assigned Serial No. 10-2012-0141154. 
       BACKGROUND OF THE INVENTION 
       [0002]    Field of the Invention 
         [0003]    The present invention relates to a device and a method, and, more particularly, to a monomer vaporizing device and a method of controlling the same. 
         [0004]    Description of the Related Art 
         [0005]    Portable electronic devices are widely used. Recently, not only small devices such as mobile phones but also tablet PCs have become widely used as portable electronic devices. 
         [0006]    In order to support various functions, a portable electronic device includes a display unit for providing visual information such as an image to a user. Recently, as other device components for driving the display unit have become smaller, the percentage of the device volume that is occupied by the display unit in the portable electronic device has increased. Taking advantage of these advances, a display unit which may be bent at a predetermined angle has been developed. 
         [0007]    In this case, a lifetime of the display unit may be extended by forming an encapsulation layer and separating the display unit from the external environment. In detail, the encapsulation layer may be formed as a multi-layer thin film by coating an organic layer (referred to as a monomer layer) and an inorganic layer. In particular, the monomer layer may be formed on a top surface of the display unit by spraying a vaporized monomer onto the display unit in a deposition chamber by using a monomer vaporizing device. 
       SUMMARY OF THE INVENTION 
       [0008]    The present invention provides a monomer vaporizing device which may smoothly supply a monomer to a display surface to be coated and a method of controlling the monomer vaporizing device. 
         [0009]    According to an embodiment of the present invention, there is provided a monomer vaporizing device including: a first vaporizer that receives a purge gas and vaporizes a first monomer; a second vaporizer that is disposed parallel to the first vaporizer, receives the purge gas, and vaporizes a second monomer; a first flow pipe that is connected to the first vaporizer and allows the first monomer vaporized by the first vaporizer to flow therethrough; a second flow pipe that is connected to the second vaporizer and allows the second monomer vaporized by the second vaporizer to flow therethrough; a transition tube that is connected to the first flow pipe and the second flow pipe and supplies at least one of the first monomer and the second monomer to a deposition chamber; and a control valve that is provided on at least one of the first flow pipe and the second flow pipe and adjusts an opening degree of at least one of the first flow pipe and the second flow pipe. 
         [0010]    The control valve may include a three way valve that is provided at a position where the first flow pipe, the second flow pipe, and the transition tube meet. 
         [0011]    The control valve may include: a first control valve that is provided on the first flow pipe and adjusts an opening degree of the first flow pipe; and a second control device that is provided on the second flow pipe and adjusts an opening degree of the second flow pipe. 
         [0012]    The monomer vaporizing device may further include: a first sensor unit that is provided on the first vaporizer and measures at least one of a pressure and a temperature of the first vaporizer; and a second sensor unit that is provided on the second vaporizer and measures at least one of a pressure and a temperature of the second vaporizer. 
         [0013]    The monomer vaporizing device may further include a control unit that controls an opening degree of the control valve based on at least one of the pressure and the temperature measured by each of the first sensor unit and the second sensor unit. 
         [0014]    When it is determined that the pressure of the first vaporizer as measured by the first sensor unit exceeds a preset first set pressure range, the control unit may direct the control valve to close the first flow pipe and open the second flow pipe. 
         [0015]    When it is determined that the pressure of the second vaporizer as measured by the second sensor unit exceeds a second set pressure range which is preset, the control unit may direct the control valve to close the second flow pipe. 
         [0016]    When the pressure of the first vaporizer does not reach a first set pressure range for a first set time, the control unit may direct the control valve to close the first flow pipe and open the second flow pipe. 
         [0017]    When the pressure of the second vaporizer does not reach a second set pressure range for a second set time, the control unit may direct the control valve to close the second flow pipe. 
         [0018]    When it is determined that the temperature of the first vaporizer as measured by the first sensor unit exceeds a first set temperature range which is preset, the control unit may direct the control valve to close the first flow pipe and open the second flow pipe. 
         [0019]    When it is determined that the temperature of the second vaporizer as measured by the second sensor unit exceeds a second set temperature range which is preset, the control unit may direct the control valve to close the second flow pipe. 
         [0020]    When the temperature of the first vaporizer does not reach a first set temperature range for a third set time, the control unit may direct the control valve to close the first flow pipe and open the second flow pipe. 
         [0021]    When the temperature of the second vaporizer does not reach a second set temperature range for a fourth set time, the control unit may direct the control valve to close the second flow pipe. 
         [0022]    The monomer vaporizing device may further include an alarm unit that alarms an external user when at least one of the pressure and the temperature measured by each of the first sensor unit and the second sensor unit does not correspond to at least one of a set pressure range and a set temperature range which are preset. 
         [0023]    The monomer vaporizing device may further include a monomer supply unit that supplies at least one of the first monomer and the second monomer to at least one of the first vaporizer and the second vaporizer. 
         [0024]    The monomer supply unit may include: a monomer storage unit that stores at least one of the first monomer and the second monomer; and a monomer supply pipe that connects the monomer storage unit to at least one of the first vaporizer and the second vaporizer, and allows at least one of the first monomer and the second monomer to flow therethrough. 
         [0025]    According to another embodiment of the present invention, there is provided a method of controlling a monomer vaporizing device, the method including: supplying a monomer to at least one of a first vaporizer and a second vaporizer, vaporizing the monomer by heating at least one of the first vaporizer and the second vaporizer; measuring at least one of a temperature and a pressure of the first vaporizer while first supplying the monomer vaporized by the first vaporizer to a deposition chamber; and blocking the exit of the monomer from the first vaporizer based on at least one of the measured temperature and the measured pressure of the first vaporizer, and, if the exit of the monomer from the first vaporizer is blocked, supplying the monomer vaporized by the second vaporizer to the deposition chamber. 
         [0026]    The blocking of the monomer supplied by the first vaporizer may include blocking the monomer supplied by the first vaporizer when the pressure of the first vaporizer exceeds a first set pressure range which is preset. 
         [0027]    The supplying of the monomer vaporized by the second vaporizer to the deposition chamber may include supplying the monomer vaporized by the second vaporizer to the deposition chamber when the pressure of the second vaporizer corresponds to a second set pressure range which is preset. 
         [0028]    The blocking of the monomer supplied by the first vaporizer may include blocking the monomer supplied by the first vaporizer when the pressure of the first vaporizer does not reach a first set pressure range within a first set time. 
         [0029]    The method may further include blocking the monomer supplied by the second vaporizer to the deposition chamber when the pressure of the second vaporizer does not reach a second set pressure range within a second set time. 
         [0030]    The blocking of the monomer supplied by the first vaporizer may include blocking the monomer supplied by the first vaporizer when the temperature of the first vaporizer does not reach a first set temperature range within a third set time. 
         [0031]    The monomer supplied by the second vaporizer to the deposition chamber may be blocked when the temperature of the second vaporizer does not reach a second set temperature range within a fourth set time. 
         [0032]    The blocking of the monomer supplied by the first vaporizer may include blocking the monomer supplied by the first vaporizer when the temperature of the first vaporizer exceeds a first set temperature range which is preset. 
         [0033]    The monomer supplied by the second vaporizer to the deposition chamber may be blocked when the temperature of the second vaporizer exceeds a second set temperature range which is preset. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0034]    The above and other features and advantages of the present invention will be made more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: 
           [0035]      FIG. 1  is a perspective view illustrating a monomer vaporizing device according to an embodiment of the present invention; 
           [0036]      FIG. 2  is a block diagram illustrating the monomer vaporizing device of  FIG. 1 ; 
           [0037]      FIG. 3  is a block diagram illustrating a control flow of the monomer vaporizing device of  FIG. 1 ; 
           [0038]      FIG. 4  is a flowchart illustrating a method of controlling the monomer vaporizing device of  FIG. 1 , according to an embodiment of the present invention; and 
           [0039]      FIG. 5  is a flowchart illustrating a method of controlling the monomer vaporizing device of  FIG. 1 , according to another embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0040]    As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. 
         [0041]    The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; rather these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to one of ordinary skill in the art. Meanwhile, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments. As used herein, the singular forms “a,” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising” used herein specify the presence of stated features, integers, steps, operations, members, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, members, components, and/or groups thereof. It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. 
         [0042]    A first monomer and a second monomer used herein may be the same material. For convenience of explanation, however, a monomer introduced into a first vaporizer  120  will be referred to as a first monomer and a monomer introduced into a second vaporizer  130  will be referred to as a second monomer. 
         [0043]      FIG. 1  is a perspective view illustrating a monomer vaporizing device  100  according to an embodiment of the present invention.  FIG. 2  is a block diagram illustrating the monomer vaporizing device  100  of  FIG. 1 . 
         [0044]    Referring to  FIGS. 1 and 2 , the monomer vaporizing device  100  may include a monomer supply unit  110  that stores at least one of the first monomer and the second monomer and supplies the stored monomer to at least one of the first vaporizer  120  and the second vaporizer  130 . In this case, the monomer supply unit  110  may include a monomer storage unit  111  that stores at least one of the first monomer and the second monomer. The monomer storage unit  111  may store at least one of the first monomer and the second monomer in a liquid state. 
         [0045]    Also, the monomer supply unit  110  may include a monomer supply pipe  112  that connects the monomer storage unit  111  to at least one of the first vaporizer  120  and the second vaporizer  130  and allows at least one of the first monomer and the second monomer to flow therethrough. In this case, the monomer supply pipe  112  may include a first connection pipe  113  that is connected to the monomer storage unit  111  and allows at least one of the first monomer and the second monomer to flow therethrough. Also, the monomer supply pipe  112  may include a first branch pipe  114   a  that branches from the first connection pipe  113 . The monomer supply pipe  112  may include a second branch pipe  114   b  that branches from the first connection pipe  113  and is spaced apart by a certain interval from the first branch pipe  114   a.    
         [0046]    The monomer supply pipe  112  may include a second connection pipe  115  to which the first branch pipe  114   a  and the second branch pipe  114   b  gather and through which at least one of the first monomer and the second monomer flows. Also, the monomer supply pipe  112  may include a first supply pipe  116   a  that branches from the second connection pipe  115  and is connected to the first vaporizer  120 , and a second supply pipe  116   b  that branches from the second connection pipe  115  and is connected to the second vaporizer  130 . 
         [0047]    The monomer supply unit  110  may include an opening/closing valve  117  that is provided on the monomer supply pipe  112  and opens/closes the monomer supply pipe  112 . In this case, a plurality of the opening/closing valves  117  may be provided. The plurality of opening/closing valves  117  may be disposed on the first branch pipe  114   a  and the second branch pipe  114   b  to be spaced apart by a certain interval from each other. 
         [0048]    In detail, the plurality of opening/closing valves  117  may include a first opening/closing valve  117   a  and a second opening/closing valve  117   b  provided on the first branch pipe  114   a , and a third opening/closing valve  117   c  and a fourth opening/closing valve  117   d  provided on the second branch pipe  114   b . In this case, the first opening/closing valve  117   a  and the second opening/closing valve  117   b  may open or close the first branch pipe  114   a . Also, the third opening/closing valve  117   c  and the fourth opening/closing valve  117   d  may open or close the second branch pipe  114   b . In particular, the first opening/closing valve  117   a  through the fourth opening/closing valve  117   d  may be electromagnetic valves that are opened/closed according to an electromagnetic signal. However, the present embodiment is not limited thereto, and the first opening/closing valve  117   a  through the fourth opening/closing valve  117   d  may be any of various types of valves as long as they may open/close the first branch pipe  114   a  and the second branch pipe  114   b.    
         [0049]    The monomer supply unit  110  may include an actuator (not shown) that is provided on the monomer supply pipe  112  and causes the first monomer or the second monomer to flow. In particular, the actuator may include a first actuator  118   a  that is provided on the first branch pipe  114   a  and a second actuator  118   b  that is provided on the second branch pipe  114   b . In this case, the first actuator  118   a  and the second actuator  118   b  may be formed as syringe pumps. 
         [0050]    The first actuator  118   a  may be connected to the first branch pipe  14   a  between the first opening/closing valve  117   a  and the second opening/closing valve  117   b . Also, the second actuator  118   b  may be connected to the second branch pipe  114   b  between the third opening/closing valve  117   c  and the fourth opening/closing valve  117   d.    
         [0051]    The monomer vaporizing device  100  may include the first vaporizer  120 , which functions to receive a purge gas and vaporize the first monomer. In this case, the first vaporizer may be connected to the monomer supply pipe  112  as described above. In particular, the first vaporizer  120  may be connected to the first supply pipe  116   a  and may receive the first monomer. 
         [0052]    The first vaporizer  120  may include a first barrel  121 , into which the first monomer has been sprayed via a nozzle and in which the first monomer is stored. Also, the first vaporizer  120  may include a first temperature control unit (not shown) that is provided on the first barrel  121  and heats or cools an inside of the first barrel  121 . In this case, the first barrel  121  and the first temperature control unit are similar to those used in monomer vaporizers generally known in the art, and thus a detailed explanation thereof will not be given. 
         [0053]    The monomer vaporizing device  100  may include a second vaporizer  130  that is disposed parallel to the first vaporizer  120 . In this case, the second vaporizer  130  may include a second barrel  131  and a second temperature control unit (not shown), like the first vaporizer  120 . 
         [0054]    Also, the second vaporizer  130  may be connected to the second supply pipe  116   b  and may vaporize the second monomer supplied from the second supply pipe  116   b . In this case, the second vaporizer  130  may receive an external purge gas and may vaporize the second monomer. 
         [0055]    The monomer vaporizing device  100  may include a first flow pipe  141  that is connected to the first vaporizer  120  and allows the first monomer, vaporized by the first vaporizer  120 , to flow therethrough. Also, the monomer vaporizing device  100  may include a second flow pipe  142  that is spaced apart by a certain interval from the first flow pipe  141 , is connected to the second vaporizer  130 , and allows the second monomer, vaporized by the second vaporizer  130 , to flow therethrough. 
         [0056]    The monomer vaporizing device  100  may include a transition tube  150  that is connected to the first flow pipe  141  and the second flow pipe  142 , and is also connected to a deposition chamber  170 . In this case, the transition tube  150  may supply at least one of the first monomer and the second monomer to the deposition chamber  170 . 
         [0057]    Also, the monomer vaporizing device  100  may include a control valve  160  that is provided on at least one of the first flow pipe  141  and the second flow pipe  142 . In this case, the control valve  160  may adjust an opening degree of at least one of the first flow pipe  141  and the second flow pipe  142 . In particular, the control valve  160  may be provided at any of various positions. In detail, the control valve  160  may be provided at a position where the first flow pipe  141 , the second flow pipe  142 , and the transition tube  150  meet. In this case, the control valve may include a three-way valve provided at the position where the first flow pipe  141 , the second flow pipe  142 , and the transition tube  150  meet. 
         [0058]    Also, the control valve  160  may be provided on each of the first flow pipe  141  and the second flow pipe  142 . In this case, the control valve  160  may include a first control valve  161  that is provided on the first flow pipe  141 , and a second control valve  162  that is provided on the second flow pipe  142 . 
         [0059]    For convenience, the following explanation will be made in detail on the assumption that the control valve  160  includes the first control valve  161  and the second control valve  162 . 
         [0060]    The monomer vaporizing device  100  may include a first sensor unit  181  that is provided on the first vaporizer  120  and measures at least one of a pressure and a temperature of the first vaporizer  120 . Also, the monomer vaporizing device  100  may include a second sensor unit  182  that is provided on the second vaporizer  130  and measures at least one of a pressure and a temperature of the second vaporizer  130 . 
         [0061]    In this case, the first sensor unit  181  may include a first pressure measuring sensor unit  181   a  that measures a pressure in the first vaporizer  120 . In particular, the first sensor unit  181  may further include a first temperature measuring sensor unit  181   b  that measures a temperature in the first vaporizer  120  or a temperature of the first temperature control unit. 
         [0062]    The second sensor unit  182  may include a second pressure measuring sensor unit  182   a  and a second temperature measuring sensor unit  182   b , like the first sensor unit  181 . In this case, the second pressure measuring sensor unit  182   a  and the second temperature measuring sensor unit  182   b  are the same as the first pressure measuring sensor unit  181   a  and the first temperature measuring sensor unit  181   b  in terms of structure and function, and thus a detailed explanation thereof will not be given. 
         [0063]    The monomer vaporizing device  100  may include a control unit  190  that controls an opening degree of the control valve  160  based on at least one of the pressure and the temperature measured by the first sensor unit  181  and the second sensor unit  182 . In this case, examples of the control unit  190  may include an external personal computer or a portable electronic device, and the control unit  190  may include a circuit board provided therein. 
         [0064]    The control unit  190  may control the first control valve  161  based on at least one of the pressure and the temperature of the first vaporizer  120  as measured by the first sensor unit  181 . Also, the control unit  190  may control the second control valve  162  based on at least one of the pressure and the temperature of the second vaporizer  130  as measured by the second sensor unit  182 . A control method of the control unit  190  will be explained below in detail. 
         [0065]    The monomer vaporizing device  100  may include an alarm unit (not shown) that alarms an external user that the first vaporizer  120  and the second vaporizer  130  malfunction. In this case, the alarm unit may be any of various types of devices. For example, the alarm unit may include an audio unit that outputs an alarming sound, or may include a display unit that outputs an alarming text or image. For convenience, the following explanation will be made on the assumption that the alarming unit includes an audio unit. 
         [0066]    A method of controlling the monomer vaporizing device  100  will now be explained in detail. 
         [0067]      FIG. 3  is a block diagram illustrating a control flow of the monomer vaporizing device  100  of  FIG. 1 .  FIG. 4  is a flowchart illustrating a method of controlling the monomer vaporizing device  100  of  FIG. 1 , according to an embodiment of the present invention. The same reference numerals denote the same elements. 
         [0068]    Referring to  FIGS. 3 and 4 , the monomer vaporizing device  100  is a device for vaporizing a monomer and supplying the monomer to a display panel when a monomer layer constituting an encapsulation layer of the display panel is formed. The display panel may be any of various display panels such as an organic light-emitting display panel, a liquid crystal display panel, and a plasma display panel. However, for convenience, the following explanation will be made on the assumption that the display panel is an organic light-emitting display panel. 
         [0069]    Examples of the organic light-emitting display panel may include a top emission organic light-emitting display panel in which at least one internal light-emitting layer emits light toward a top surface and a bottom emission organic light-emitting display panel in which at least one internal light-emitting layer emits light toward a bottom surface. Also, the organic light-emitting display panel may include a separate light-emitting layer, a plurality of light-emitting layers stacked to emit white light, or a color filter or a color conversion layer through which emitted light passes. 
         [0070]    Also, in the organic light-emitting display panel, a semiconductor active layer may be formed of polysilicon or an oxide semiconductor. For convenience, the following explanation will be made in detail on the assumption that the display panel is a top emission organic light-emitting display panel including a separate light-emitting layer and a semiconductor active layer formed of polysilicon. In this case, a method of manufacturing the display panel may be a method generally known in the art, and thus a detailed explanation thereof will not be given. 
         [0071]    Once the manufactured display panel is prepared, the display panel may be inserted into the deposition chamber  170 . After the display panel is inserted into the deposition chamber  170 , the monomer vaporizing device  100  may operate. 
         [0072]    Once the monomer vaporizing device  100  operates, the first opening/closing valve  117   a  through the fourth opening/closing valve  117   d  may be opened to cause the first monomer and the second monomer stored in the monomer storage unit  111  to flow. In this case, the first actuator  118   a  and the second actuator  118   b  may operate to cause the first monomer and the second monomer to flow from the monomer storage unit  111  to the monomer supply pipe  112 . 
         [0073]      t  In detail, when the first opening/closing valve  117   a  and the third opening/closing valve  117   c  are opened and then the first actuator  118   a  and the second actuator  118   b  operate, the first monomer and the second monomer stored in the monomer storage unit  111  may be transferred from the first connection pipe  113  through the first branch pipe  114   a  and the second branch pipe  114   b  to the first actuator  18   a  and the second actuator  118   b , respectively. After the first monomer and the second monomer are respectively introduced into the first actuator  118   a  and the second actuator  118   b , the first opening/closing valve  117   a  and the third opening/closing valve  117   c  may be closed. 
         [0074]    When the process is completed, the second opening/closing valve  117   b  and the fourth opening/closing valve  117   d  may be opened and then the first actuator  118   a  and the second actuator  118   b  may operate. In this case, the first monomer and the second monomer may flow to the first branch pipe  114   a  and the second branch pipe  114   b.    
         [0075]    The first monomer and the second monomer flowing as described above may gather from the first branch pipe  114   a  and the second branch pipe  114   b  to the first connection pipe  113  and then may respectively branch to the first supply pipe  116   a  and the second supply pipe  116   b . In this case, the first supply pipe  116   a  and the second supply pipe  116   b  may respectively supply the first monomer and the second monomer to the first vaporizer  120  and the second vaporizer  130 . 
         [0076]    When certain amounts of first monomer and second monomer are respectively supplied to the first vaporizer  120  and the second vaporizer  130  as described above, the second opening/closing valve  117   b  and the fourth opening/closing valve  117   d  may operate to close the first branch pipe  114   a  and the second branch pipe  114   b . Accordingly, after the first monomer and the second monomer are respectively supplied to the first vaporizer  120  and the second vaporizer  130 , the second opening/closing valve  117   b  and the fourth opening/closing valve  117   d  may prevent the first monomer and the second monomer from flowing backward from the first vaporizer  120  and the second vaporizer  130 . 
         [0077]    Once the first monomer and the second monomer are supplied as described above, the first monomer and the second monomer may be respectively introduced into the first barrel  121  and the second barrel  131 . In this case, the first monomer and the second monomer may be sprayed into the first barrel  121  and the second barrel  131  through ultrasonic nozzles. 
         [0078]    When the first monomer and the second monomer are respectively sprayed into the first barrel  121  and the second barrel  131  as described above, the first temperature control unit  122  and the second temperature control unit  132  may operate. In this case, the first temperature control unit  122  and the second temperature control unit  132  may operate simultaneously or sequentially. In particular, in one embodiment, the first temperature control unit  122  may first operate, and the second temperature control unit  132  may operate when the control unit  190  determines that the first barrel  121  malfunctions. However, for convenience, the following explanation will be made for the case in which the first temperature control unit  122  and the second control unit  132  operate sequentially. 
         [0079]    In detail, the control unit  190  may increase a temperature in the first barrel  121  by causing the first temperature control unit  122  to operate. In this case, the control unit  190  may measure a temperature of the first temperature control unit  122  and may maintain the temperature in the first barrel  121  in a certain range. 
         [0080]    When the first temperature control unit  122  operates as described above, the first monomer in the first barrel  121  may be vaporized into a gas. In this case, the first temperature measuring sensor unit  181   b  provided on the first temperature control unit  122  and the first pressure measuring sensor unit  181   a  provided on the first barrel  121  may measure a temperature and a pressure of the first vaporizer  120  and transmit the temperature and the pressure to the control unit  190 . The following explanation will be made in detail on the assumption that the first control valve  161  is controlled by using the pressure of the first vaporizer  120 . 
         [0081]    In detail, the pressure in the first barrel  121  measured by the first pressure measuring sensor unit  181   a  may be transmitted to the control unit  190 . In this case, a first set pressure range may be preset in the control unit  190 . 
         [0082]    When the pressure of the first barrel  121  corresponds to the first set pressure range, the control unit  190  may open the first flow pipe  141  by opening the first control valve  161 . That is, when the pressure of the first barrel  121  enters the first set pressure range, the control unit  190  may open the first control valve  161 . Also, when the pressure of the first barrel  121  enters the first set pressure range in a first set time, the control unit  190  may open the first control valve  161 . In this case, the first monomer of the first vaporizer  120  may move to the deposition chamber  170  and may be deposited on the display panel. In this case, the control unit  190  may close the second control valve  162 . 
         [0083]    During the process, the first pressure measuring sensor unit  181   a  may continuously transmit the pressure of the first barrel  121  to the control unit  190 . In this case, the control unit  190  may monitor whether the first vaporizer  120  operates within acceptable parameters based on the pressure of the first barrel  121 . 
         [0084]    When it is determined as a result of the monitoring that the pressure of the first barrel  121  and the first set pressure range do not correspond to each other, the control unit  190  may cause the alarm unit to alarm the external user that the monomer vaporizing device  100  malfunctions. In particular, when the pressure of the first barrel  121  exceeds the first set pressure range, the control unit  190  may operate the alarm unit to alarm the external user. 
         [0085]    Whether the monomer vaporizing device  100  malfunctions may be determined by determining whether the pressure of the first barrel  121  corresponds to the first set pressure range as described. Alternatively, whether the monomer vaporizing device  100  malfunctions may be determined by determining whether the pressure of the first barrel  121  remains within the first set pressure range for the first set time. 
         [0086]    In detail, the control unit  190  may continuously receive data indicating the pressure of the first barrel  121  from the first pressure measuring sensor unit  181   a . In this case, the control unit  190  may determine whether the pressure of the first barrel  121  remains within the first set pressure range for the first set time. In this case, when the pressure of the first barrel  121  moves outside of the first set pressure range in the first set time, the control unit  190  may determine that the monomer vaporizing device  100  malfunctions. In particular, the control unit  190  may determine that the first vaporizer  120  malfunctions when the pressure of the first barrel does not remain within the first set pressure range in the first set time. 
         [0087]    Whether the first vaporizer  120  malfunctions may be determined by using two methods, that is, a method of determining whether the pressure exceeds the first set pressure range and a method of determining whether the pressure remains within the first set pressure range for the first set time as described above. However, for convenience, the following explanation will be made on the assumption that whether the first vaporizer  120  malfunctions is determined by determining whether the pressure exceeds the first set pressure range. 
         [0088]    When the pressure of the first barrel  121  exceeds the first set pressure range, the control unit  190  may close the first flow pipe  141  by closing the first control valve  161 . 
         [0089]    When the process is completed, the control unit  190  may cause the second temperature control unit  132  to operate. In this case, the control unit  190  may control the second temperature control unit  132  such that the second monomer of the second barrel  131  has a certain pressure and a certain temperature. 
         [0090]    While the second monomer of the second barrel  131  is heated by the second temperature control unit  132 , a temperature of the second temperature control unit  132  and a pressure of the second barrel  131  may be respectively measured by the second temperature measuring sensor unit  182   b  and the second pressure measuring sensor unit  182   a.    
         [0091]    The measured temperature and the measured pressure may be transmitted to the control unit  190 . In particular, the control unit  190  may control the second control valve  162  based on the measured pressure. 
         [0092]    In detail, the pressure of the second barrel  131  measured by the second pressure measuring sensor unit  182   a  may be transmitted to the control unit  190 . The control unit  190  may compare the pressure of the second barrel  131  with a preset second set pressure range. In this case, the second set pressure range may be set to be the same as the first set pressure range. 
         [0093]    When it is determined that the second set pressure range and the pressure of the second barrel  131  correspond to each other, the control unit  190  may open the second control valve  162  and may supply the second monomer from the second barrel  131  to the deposition chamber  170 . In this case, examples of a method of determining whether the pressure of the second barrel  131  corresponds to the second set pressure range which is performed by the control unit  190  may include a method of determining whether the pressure of the second barrel  131  is within the second set pressure range and a method of determining whether the pressure of the second barrel  131  remains within the second set pressure range for a second set time. However, for convenience, the following explanation will focus on the method of determining whether the pressure of the second barrel  131  is within the second set pressure range; this determination is reached by the control unit  190 . 
         [0094]    The second pressure measuring sensor unit  182   a  may continuously measure a pressure of the second barrel  131  in a state where the second control valve  162  is opened. The measured pressure of the second barrel  131  may be continuously transmitted to the control unit  190 . 
         [0095]    The control unit  190  may compare the pressure of the second barrel  131  with the second set pressure range. In this case, when it is determined that the pressure of the second barrel  131  exceeds the second set pressure range, the control unit  190  may alarm the external user by using the alarm unit. Also, the control unit  190  may close the second control valve  162 , closing the second flow pipe  142 . 
         [0096]    In particular, the control unit  190  may direct the second control valve  162  to be closed, and then may direct the monomer vaporizing device  100  to stop operating. 
         [0097]    Alternatively, the control unit  190  may determine whether the pressure of the second barrel  131  remains within the second set pressure range for the second set time. In particular, when the pressure of the second barrel  131  does not remain within the second set pressure range for the second set time, the control unit  190  may determine that the second vaporizer  130  malfunctions and may accordingly activate the alarm unit and close the second control valve  162 . 
         [0098]    Accordingly, when the first vaporizer  120  malfunctions, the monomer vaporizing device  100  may operate the second vaporizer  130  and thus may continuously perform the process of applying a monomer layer to the display panel. 
         [0099]    Also, the monomer vaporizing device  100  may prevent further malfunction and rapidly respond to a malfunction identified by determining the pressures of the first vaporizer  120  and the second vaporizer  130  on an ongoing basis as the monomer layer is deposited. 
         [0100]      FIG. 5  is a flowchart illustrating a method of controlling the monomer vaporizing device  100 , according to another embodiment of the present invention. The same reference numerals denote the same members. 
         [0101]    Referring to  FIG. 5 , the monomer vaporizing device  100  may be controlled based on at least one of a temperature of the first vaporizer  120  and a temperature of the second vaporizer  130 . In detail, the monomer vaporizing device  100  may be controlled based on a temperature of the first temperature control unit  122  and a temperature of the second temperature control unit  132 . In this case, a method of controlling the monomer vaporizing device  100  based on at least one of a temperature of the first temperature control unit  122  and a temperature of the second temperature control unit  132  may be similar to the method of controlling the monomer vaporizing device  100  based on at least one of a pressure of the first barrel  121  and a pressure of the second barrel  131  described above. 
         [0102]    In detail, when the display panel is prepared, the display panel may be inserted into the deposition chamber  170 . After the display panel is inserted into the deposition chamber  170 , the monomer vaporizing device  100  may operate. 
         [0103]    Once the monomer vaporizing device  100  operates, the first opening/closing valve  117   a  through the fourth opening/closing valve  117   d  may be opened to cause the first monomer and the second monomer stored in the monomer storage unit  111  to flow. In this case, the first actuator  118   a  and the second actuator  118   b  may operate to cause the first monomer and the second monomer from the monomer storage unit  111  to the monomer supply pipe  112  to flow. 
         [0104]    In detail, when the first opening/closing valve  117   a  and the third opening/closing valve  117   c  are opened and then the first actuator  118   a  and the second actuator  118   b  operate, the first monomer and the second monomer of the monomer storage unit  111  may be respectively transferred from the first connection pipe  113  to the branch pipe  114   a  and the second branch pipe  114   b  to the first actuator  118   a  and the second actuator  118   b . After the first monomer and the second monomer are respectively introduced into the first actuator  118   a  and the second actuator  118   b , the first opening/closing valve  117   a  and the third opening/closing valve  117   c  may be closed. 
         [0105]    When the process is completed, the second opening/closing valve  117   b  and the fourth opening/closing valve  117   d  may be opened and then the first actuator  118   a  and the second actuator  118   b  may operate. In this case, the first monomer and the second monomer may flow to the first branch pipe  114   a  and the second branch pipe  114   b.    
         [0106]    The first monomer and the second monomer flowing as described above may gather from the first branch pipe  114   a  and the second branch pipe  114   b  to the first connection pipe  113  and then may respectively branch to the first supply pipe  116   a  and the second supply pipe  116   b . In this case, the first supply pipe  116   a  and the second supply pipe  116   b  may respectively supply the first monomer and the second monomer to the first vaporizer  120  and the second vaporizer  130 . 
         [0107]    When certain amounts of first monomer and second monomer are respectively supplied to the first vaporizer  120  and the second vaporizer  130  as described above, the second opening/closing valve  117   b  and the fourth opening/closing valve  117   d  may operate to close the first branch pipe  114   a  and the second branch pipe  114   b . Accordingly, after the first monomer and the second monomer are respectively supplied to the first vaporizer  120  and the second vaporizer  130 , the second opening/closing valve  117   b  and the fourth opening/closing valve  117   d  may prevent the first monomer and the second monomer from flowing backward from the first vaporizer  120  and the second vaporizer  130 . 
         [0108]    Once the first monomer and the second monomer are supplied as described above, the first monomer and the second monomer may be respectively introduced into the first barrel  121  and the second barrel  131 . In this case, the first monomer and the second monomer may be sprayed into the first barrel  121  and the second barrel  131  through ultrasonic nozzles. 
         [0109]    When the first monomer and the second monomer are respectively sprayed into the first barrel  121  and the second barrel  131  as described above, the first temperature control unit  122  and the second temperature control unit  132  may operate. In this case, the first temperature control unit  122  and the second temperature control unit  132  may operate simultaneously or sequentially. In particular, the first temperature control unit  122  may first operate, and the second temperature control unit  132  may operate when the control unit  190  determines that the first barrel  121  malfunctions. However, for convenience, the following explanation will be made in detail on the assumption that the first temperature control unit  122  and the second temperature control unit  132  operate sequentially. 
         [0110]    In detail, the control unit  190  may increase a temperature in the first barrel  121  by operating the first temperature control unit  122 . In this case, the control unit  190  may measure a temperature of the first temperature control unit  122  and may maintain the temperature in the first barrel  121  in a certain range. 
         [0111]    When the first temperature control unit  122  operates as described above, the first monomer in the first barrel  121  may be vaporized into gas. In this case, the first temperature measuring sensor unit  181   b  provided on the first temperature control unit  122  may measure a temperature of the first vaporizer  120  and transmit the temperature to the control unit  190 . 
         [0112]    In detail, the temperature of the first temperature control unit  122  measured by the first temperature measuring sensor unit  181   b  may be transmitted to the control unit  190 . In this case, a first set temperature range may be preset in the control unit  190 . 
         [0113]    When the temperature of the first temperature control unit  122  corresponds to the first set temperature range, the control unit  190  may open the first flow pipe  141  by opening the first control valve  161 . That is, when the temperature of the first temperature control unit  122  enters the first set temperature range, the control unit  190  may open the first control valve  161 . Alternatively, when the temperature of the first temperature control unit  122  remains within the first set temperature range in a third set time, the control unit  190  may open the first control valve  161 . In this case, the first monomer of the first vaporizer  120  may move to the deposition chamber  170  and may be deposited on the display panel. In this case, the control unit  190  may close the second control valve  162 . 
         [0114]    During the process, the first temperature measuring sensor unit  181   b  may continuously transmit the temperature of the first temperature control unit  122  to the control unit  190 . In this case, the control unit  190  may monitor whether the first vaporizer  120  operates within acceptable parameters based on the temperature of the first temperature control unit  122 . 
         [0115]    When it is determined based on a result of the monitoring that the temperature of the first temperature control unit  122  does not correspond to the first set temperature range, the control unit  190  may direct the alarm unit to alarm the external user that the monomer vaporizing device  100  malfunctions. In particular, when the temperature of the first temperature control unit  122  exceeds the first set temperature range, the control unit  190  may operate the alarm unit to alarm the external user. 
         [0116]    Whether the monomer vaporizing device  100  malfunctions may be determined by determining whether the temperature of the first temperature control unit  122  corresponds to the first set temperature range as described above. Alternatively, whether the monomer vaporizing device  100  malfunctions may be determined by determining whether the temperature of the first temperature control unit  122  reaches the first set temperature range for a third set time. 
         [0117]    In detail, the control unit  190  may continuously receive the temperature of the first temperature control unit  122  from the first pressure measuring sensor unit  181   a . In this case, the control unit may determine whether the temperature of the first temperature control unit  122  remains within the first set temperature range for the third set time, which is preset. In this case, when the temperature of the first temperature control unit  122  does not remain within the first set temperature range for the third set time, the control unit  190  may determine that the monomer vaporizing device  100  malfunctions. In particular, the control unit  190  may determine that the first vaporizer  120  malfunctions when the temperature of the first temperature control unit  122  does not remain within the first set temperature range for the third set time. 
         [0118]    Examples of a method of determining whether the first vaporizer  120  malfunctions may include a method of determining whether the temperature exceeds the first set temperature range and a method of determining whether the temperature remains within the first set temperature range for the third set time as described above. For convenience, however, the following explanation will focus on the method of determining whether the temperature exceeds the first set temperature range in order to determine whether the first vaporizer  120  malfunctions. 
         [0119]    When the temperature of the first temperature control unit  122  exceeds the first set temperature range, the control unit  190  may close the first flow pipe  141  by closing the first control valve  161 . 
         [0120]    When the process is completed, the control unit  190  may direct the second temperature control unit  132  to operate. In this case, the control unit  190  may direct the second temperature control unit  132  such that the second monomer of the second barrel  131  is brought to a certain pressure and a certain temperature. 
         [0121]    While the second monomer of the second barrel  131  is heated by the second temperature control unit  132 , a temperature of the second temperature control unit  132  may be measured by the second temperature measuring sensor unit  182   b.    
         [0122]    The measured temperature may be transmitted to the control unit  190 . In particular, the control unit  190  may control the second control valve  162  based on the measured temperature. 
         [0123]    In detail, the temperature of the second temperature control unit  132  measured by the second temperature measuring sensor unit  182   b  may be transmitted to the control unit  190 . The control unit  190  may compare the temperature of the second temperature control unit  132  with a second set temperature range which is preset. In this case, the second set temperature range may be set to be the same as the first set temperature range. 
         [0124]    When it is determined that the second set temperature range and the temperature of the second temperature control unit  132  correspond to each other, the control unit  190  may open the second control valve  162  and may supply the second monomer from the second barrel  131  to the deposition chamber  170 . In this case, examples of a method of determining whether the temperature of the second temperature control unit  132  corresponds to the second set temperature range, the comparison being made by the control unit  190 , may include a method of determining whether the temperature of the second temperature control unit  132  is within the second set temperature range and a method of determining whether the temperature of the second temperature control unit  132  remains within the second set temperature range for a fourth set time. However, for convenience, the following explanation will focus on the method of determining whether the temperature of the second temperature control unit  132  is within the second set temperature range, the comparison being performed by the control unit  190 . 
         [0125]    The second pressure measuring sensor unit  182   a  may continuously measure the temperature of the second temperature control unit  132  in a state where the second control valve is opened. The measured temperature of the second temperature control unit  132  may be continuously transmitted to the control unit  190 . 
         [0126]    The control unit  190  may compare the temperature of the second temperature control unit  132  with the second set temperature range. In this case, when it is determined that the temperature of the second temperature control unit  132  exceeds the second set temperature range, the control unit  190  may alarm the external user by using the alarm unit. Also, the control unit  190  may close the second control valve  162  to close the second flow pipe  142 . 
         [0127]    In particular, the control unit  190  may close the second control valve  162  and then may direct the monomer vaporizing device  100  to stop operating. 
         [0128]    Alternatively, the control unit  190  may determine whether the temperature of the second temperature control unit  132  remains within the second set temperature range for the fourth set time. In particular, when the temperature of the second temperature control unit  132  does not remain within the second set temperature range for the fourth set time, the control unit  190  may determine that the second vaporizer  130  malfunctions and may accordingly activate the alarm unit and close the second control valve  162 . 
         [0129]    Accordingly, when the first vaporizer  120  malfunctions, the monomer vaporizing device  100  may operate the second vaporizer, thus ensuring that the application of a monomer layer to the display panel proceeds as a continuous process. 
         [0130]    Thus, the monomer vaporizing device  100  may prevent a malfunction and, if necessary, rapidly respond to a malfunction that does occur by monitoring the pressures of the first vaporizer  120  and the second vaporizer  130  as the monomer layer is deposited onto the display panel. 
         [0131]    According to the embodiments of the present invention, when a first vaporizer malfunctions, a second vaporizer is operated. Accordingly, when a monomer layer is applied to a display panel, the process may be continuously performed. 
         [0132]    Also, according to the embodiments of the present invention, a malfunction may be prevented and a fast response to a malfunction may be ensured by determining, based on pressures of the first vaporizer and the second vaporizer as monitored by control unit  190 , whether a monomer vaporizing device malfunctions as a monomer layer is deposited. 
         [0133]    While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.