Patent Publication Number: US-10760747-B2

Title: Lighting apparatus

Description:
TECHNICAL FIELD 
     The present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus including a plurality of lighting panel. 
     BACKGROUND ART 
     Generally, bulbs or fluorescent lamps are being much used as indoor or outdoor lightings, but since the bulbs or the fluorescent lamps are very short in lifetime, the bulbs or the fluorescent lamps should be frequently replaced. In order to solve such a problem, a lighting apparatus using a light emitting diode (LED) has been developed. Particularly, since an LED lighting apparatus has good controllability, a fast response time, high electro-optical conversion efficiency, long lifetime, and low power consumption, development and research on the lighting apparatus using the LED are being more actively done. 
     Recently, a lighting apparatus where a plurality of LED modules are assembled in series or parallel is being developed. Particularly, an organic light emitting diode (OLED) lighting panel using an organic light emitting device instead of an LED module is being developed, and moreover, a lighting apparatus where a plurality of OLED lighting panels are assembled in series or parallel is being researched and developed. 
       FIG. 1  is a diagram for describing a related art lighting apparatus. 
     Referring to  FIG. 1 , the related art lighting apparatus may include first to nth lighting panels  10 - 1  to  10 - n  connected to each other electrically and serially, a power supply member  20 , and a power cable  30 . 
     Each of the first to nth lighting panels  10 - 1  to  10 - n  may be a flat light source including an LED module or an organic light emitting device. A first power terminal is provided in one end of each of the first to nth lighting panels  10 - 1  to  10 - n , and a second power terminal is provided in the other end of each of the first to nth lighting panels  10 - 1  to  10 - n . Here, the first power terminal may be a first lighting power source (for example, a positive terminal (+)), and the second power terminal may be a second lighting power source (for example, a negative terminal (−)). 
     The power supply member  20  is connected to the first power terminal of the first lighting panel  10 - 1  and the power cable  30  and supplies a lighting power, supplied from the outside, to the first lighting panel  10 - 1 . 
     The power cable  30  electrically connects the second power terminal of the nth lighting panel  10 - n  to the power supply member  20 . 
     The related art lighting apparatus drives the first to nth lighting panels  10 - 1  to  10 - n  with the lighting power to illuminate the inside or the outside. 
     However, in the related art lighting apparatus, due to an internal resistance of each of the first to nth lighting panels  10 - 1  to  10 - n , brightness is reduced in a direction from the first lighting panel  10 - 1  to the nth lighting panel  10 - n , and for this reason, there is a problem where brightness of each of the first to nth lighting panels  10 - 1  to  10 - n  is non-uniform. Also, in the related art lighting apparatus, since a separate power cable  30  for electrically and serially connecting the first to nth lighting panels  10 - 1  to  10 - n  is needed, expandability is reduced due to a length of the power cable  30 . 
     Information disclosed in this Background section was already known to the inventors of the present invention before achieving the present invention or is technical information acquired in the process of achieving the present invention. Therefore, it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. 
     DISCLOSURE 
     Technical Problem 
     Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a lighting apparatus which is easy in expandability of a plurality of lighting panels. 
     Also, it is another object of the present invention to provide a lighting apparatus in which a plurality of lighting panels are easily connected to each other in series or parallel. 
     Technical Solution 
     To accomplish the above-described objects, a lighting apparatus according to the present invention may include: a plurality of lighting panels including an emission part having a light emitting device which emits light with a current flowing between a first electrode and a second electrode; and a panel connection means disposed between the plurality of lighting panels to electrically connect first and second electrodes between adjacent lighting panels, wherein each of the plurality of lighting panels may include first and second auxiliary wirings electrically connected between adjacent panel connection means. 
     The panel connection means may electrically and serially connect the first and second electrodes between the adjacent lighting panels. 
     Each of the plurality of lighting panels may be simultaneously supplied with a lighting power through each of two adjacent panel connection means. 
     To accomplish the above-described objects, a lighting apparatus according to the present invention may include one or more lighting panels including an emission part provided on a substrate, wherein the lighting panel may include one or more auxiliary wirings formed on the substrate to supply power to the emission part. 
     To accomplish the above-described objects, a lighting apparatus according to the present invention may include a plurality of lighting panels, wherein each of the plurality of lighting panels may include: an emission part including a light emitting device which emits light with a current flowing in a primary electrode; and a secondary electrode electrically connected to the primary electrode. 
     To accomplish the above-described objects, a lighting apparatus according to the present invention may include: a lighting panel including an emission part; a first wiring provided in the lighting panel to supply power to the emission part; and a second wiring provided in the lighting panel to divert the power without supplying the power to the emission part. 
     Advantageous Effect 
     According to the technical solution, the present invention electrically connects a plurality of lighting panels through a panel connection means in series or parallel, thereby facilitating the serial or parallel connection and expandability of the plurality of lighting panels. 
     Moreover, the present invention transfers a lighting power to a next-end lighting panel through a separate auxiliary wiring provided in each of the lighting panels when connecting the plurality of lighting panels through the panel connection means in parallel, and thus, can minimize the voltage drop of the lighting power supplied to each lighting panel, thereby increasing the emission uniformity of each lighting panel. 
     In addition to the aforesaid objects of the present invention, other features and advantages of the present invention will be described below, but will be clearly understood by those skilled in the art from descriptions below. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram for describing a related art lighting apparatus. 
         FIG. 2  is a diagram for describing a lighting apparatus according to the present invention. 
         FIG. 3  is a diagram for describing each of a plurality of lighting panels according to an embodiment of the present invention illustrated in  FIG. 2 . 
         FIG. 4  is a cross-sectional view taken along line I-I′ illustrated in  FIG. 3 . 
         FIG. 5  is a diagram for describing each of a plurality of lighting panels according to another embodiment of the present invention illustrated in  FIG. 2 . 
         FIG. 6  is a cross-sectional view taken along line II-II′ illustrated in  FIG. 5 . 
         FIG. 7  is a cross-sectional view taken along line II-II′ illustrated in  FIG. 5  and is a cross-sectional view for describing first and second auxiliary wirings according to a modification embodiment. 
         FIG. 8  is a diagram for describing each of a plurality of intermediate connection members according to an embodiment illustrated in  FIG. 2 . 
         FIG. 9  is a diagram for describing each of a plurality of middle connection members according to another embodiment illustrated in  FIG. 2 . 
         FIG. 10  is a diagram for describing each of a plurality of end connection members according to an embodiment illustrated in  FIG. 2 . 
     
    
    
     MODE FOR INVENTION 
     The terms described in the specification should be understood as follows. 
     The terms described in the specification should be understood as follows. 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. The terms “first” and “second” are for differentiating one element from the other element, and these elements should not be limited by these terms. It will be further understood that the terms “comprises”, “comprising,”, “has”, “having”, “includes” and/or “including”, when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The term “at least one” should be understood as including any and all combinations of one or more of the associated listed items. For example, the meaning of “at least one of a first item, a second item, and a third item” denotes the combination of all items proposed from two or more of the first item, the second item, and the third item as well as the first item, the second item, or the third item. The term “on” should be construed as including a case where one element is formed at a top of another element and moreover a case where a third element is disposed therebetween. 
     Hereinafter, exemplary embodiments of a light guide plate, and a backlight unit and a mobile device including the same according to the present invention will be described in detail with reference to the accompanying drawings. In the specification, in adding reference numerals for elements in each drawing, it should be noted that like reference numerals already used to denote like elements in other drawings are used for elements wherever possible. In the following description, when the detailed description of the relevant known function or configuration is determined to unnecessarily obscure the important point of the present invention, the detailed description will be omitted. 
       FIG. 2  is a diagram for describing a lighting apparatus according to the present invention. 
     Referring to  FIG. 2 , the lighting apparatus according to the present invention includes a plurality of lighting panels  1111  to  111   n  and a panel connection means  120 . 
     A power supply means  100  is electrically connected to a first lighting panel  1111  of the plurality of lighting panels  1111  to  111   n , and the first lighting panel  1111  is supplied with a lighting power from the power supply means  100 . Each of the plurality of lighting panels  1111  to  111   n  may have a square shape, but may have a polygonal shape including a rectangular shape or a polygonal shape including a curved surface without being limited thereto. 
     Each of the plurality of lighting panels  1111  to  111   n  includes an emission part  220  including a light emitting device that emits light with a current flowing between a first electrode (for a first primary electrode) and a second electrode (or a second primary electrode). Here, the light emitting device of the emission part  220  is a current driving type semiconductor device and may be an LED or an organic light emitting device. 
     The emission part  220  according to an embodiment may include a plurality of LEDs which are connected in series and/or parallel between the first and second electrodes. 
     The emission part  220  according to another embodiment may include the first electrode, the second electrode, and an organic light emitting device including an organic layer provided between the first electrode and the second electrode. 
     Each of the plurality of lighting panels  1111  to  111   n  includes first and second auxiliary wirings  240  and  250  for supplying power to the emission part  220 . 
     Each of the first and second auxiliary wirings  240  and  250  supplies the power to the emission part  220  through the panel connection means  120  adjacent thereto. 
     The panel connection means  120  is disposed between the plurality of lighting panels  1111  to  111   n  and electrically connects the emission part  220  to the auxiliary wirings  240  and  250 . That is, the panel connection means  120  is disposed between the plurality of lighting panels  1111  to  111   n  and electrically connects the first and second electrodes between adjacent lighting panels. The panel connection means  120  according to an embodiment may include a plurality of middle connection members  121 - 1  to  121 - m  and an end connection member  123 . 
     Each of the plurality of middle connection members  121 - 1  to  121 - m  may be disposed between a pair of lighting panels  1111  to  111   n  which are adjacent to each other in a lengthwise direction X of the lighting apparatus, and may electrically connect first and second electrodes between the pair of lighting panels  1111  to  111   n  adjacent to each other. That is, the middle connection members  121 - 1  to  121 - m  may electrically and serially or parallelly connect first and second electrodes, provided in some lighting panels  1111  to  111   n  adjacent to one side thereof, to first and second electrodes provided in other lighting panels  1111  to  111   n  adjacent to the other side thereof. 
     The end connection member  123  may connect the first auxiliary wiring  240  to a first electrode provided in a last lighting panel  111   n  and may connect the second auxiliary wiring  250  to a second electrode provided in the last lighting panel  111   n.    
     The panel connection means  120  may electrically connect first and second electrodes between adjacent lighting panels in series or parallel, and thus, may allow the plurality of lighting panels  1111  to  111   n  to be electrically driven in series or parallel according to the lighting power supplied through the power supply means  100 . 
     In the lighting apparatus according to the present invention, since adjacent lighting panels  1111  to  111   n  may be electrically connected to each other through the panel connection means  120  in series or parallel, a serial or parallel connection between the plurality of lighting panels  1111  to  111   n  is easy, and expandability is easy. 
     The lighting panels  1112  to  111   n  other than a first lighting panel  1111  of the plurality of lighting panels  1111  to  111   n  may be additional lighting panels. Here, the lighting panel  1111  and the additional lighting panels  1112  to  111   n  may be electrically connected to each other through the panel connection means  120  in series or parallel. 
       FIG. 3  is a diagram for describing each of a plurality of lighting panels according to an embodiment of the present invention illustrated in  FIG. 2 , and  FIG. 4  is a cross-sectional view taken along line I-I′ illustrated in  FIG. 3 . 
     Referring to  FIGS. 3 and 4 , each of the plurality of lighting panels  1111  to  111   n  according to an embodiment of the present invention includes a first substrate  210 , the emission part  220 , an encapsulation layer  230 , the first auxiliary wiring  240 , the second auxiliary wiring  250 , a first power terminal part  260 , a second power terminal part  270 , and a second substrate  280 . 
     The first substrate  210  may be a transparent glass substrate or a transparent flexible substrate. Here, the transparent flexible substrate may be formed of one of polyethyleneterephthalate (PET), polycarbonate (PC), polyethersulfone (PES), polyethylenapthanate (PEN), and polynorborneen (PNB). 
     The emission part  220  may be formed on the first substrate  210  and may emit light according to the lighting power (e.g., an anode power and a cathode power) simultaneously supplied from each of the first and second power terminal parts  260  and  270  to irradiate the light for lighting. The emission part  220  may be formed between the first and second auxiliary wirings  240  and  250 . The emission part  220  according to an embodiment may include a first electrode  221  formed on the first substrate  210 , an organic layer  223  formed on the first electrode  221 , and a second electrode  225  formed on the organic layer  223 . 
     The first electrode  221  is deposited all over a portion other than an edge portion of the first substrate  210  and may be an anode electrode (or a first primary electrode or a first wiring). The lighting power (e.g., the anode power) is supplied to the first electrode  221  through the panel connection means. Here, if the lighting panels  1111  to  111   n  are a bottom and dual emission type, the first electrode  221  may be formed of a transparent conductive material, and if the lighting panels  1111  to  111   n  are a top emission type, the first electrode  221  may be formed of a reflective conductive material. Hereinafter, it is assumed that the first electrode  221  is formed of a transparent conductive material. 
     The organic layer  223  is formed on the first electrode  221  and emits light with a current flowing between the first and second electrodes  221  and  225 . To this end, the organic layer  223  may include a hole injection layer, a hole transport layer, an organic emission layer, an electron transport layer, and an electron injection layer which are sequentially stacked on the first electrode  221 . In the organic layer  223 , an electron and a hole are recombined by the current flowing between the first and second electrodes  221  and  225  to generate an exciton having a high energy state in the organic emission layer, and the exciton is shifted from an excited state to a ground state to emit light based on an energy difference between two states, thereby emitting light for lighting. 
     The second electrode  225  is formed on the organic layer  223  and may be a cathode electrode (or a second primary electrode). If the lighting apparatus is a top and dual emission type, the second electrode  225  may be formed of a transparent conductive material, and if the lighting apparatus is a bottom emission type, the second electrode  225  may be formed of a reflective conductive material. Hereinafter, it is assumed that the second electrode  225  is formed of a reflective conductive material. 
     The encapsulation layer  230  is formed on the first substrate  210  to cover the emission part  220 . The encapsulation layer  230  may have a multi-layer structure where an inorganic layer and an organic layer are alternately stacked. The encapsulation layer  230  prevents external oxygen and/or water from penetrating into the emission part  220 , thereby preventing the emission part  220  from being deteriorated by the oxygen and/or the water. 
     The first auxiliary wiring  240  is for supplying power to the emission part  220  and is electrically connected to the first electrode  221  (or the first primary electrode). To this end, the first auxiliary wiring  240  is formed in one non-emission area of the first substrate  210  and is connected to the first and second power terminal parts  250  and  260 , and may be a second wiring that diverts the lighting power without applying the lighting power to the emission part  220 . In this case, the first auxiliary wiring  240  may be formed in a  -shape in the one non-emission area of the first substrate  210  to surround one side of the emission part  220 . The first auxiliary wiring  240  transmits the lighting power (e.g., the anode power), supplied from the first power terminal part  250 , to the second power terminal part  260 . The first auxiliary wiring  240  is a power transmission wiring and may be formed of a metal material which is low in sheet resistance and is high in electric conductivity. 
     The second auxiliary wiring  250  is for supplying power to the emission part  220  and is electrically connected to the second electrode  225  (or the second primary electrode). To this end, the second auxiliary wiring  250  is formed in the other non-emission area of the first substrate  210  and is connected to the first and second power terminal parts  250  and  260 . In this case, the second auxiliary wiring  250  may be formed in a  -shape in the other non-emission area of the first substrate  210  to surround the other side of the emission part  220  and has a symmetric structure about the first auxiliary wiring  240  with the emission part  220  therebetween. The second auxiliary wiring  250  transmits the lighting power (e.g., the cathode power), supplied from the second power terminal part  260 , to the second power terminal part  260 . The second auxiliary wiring  250  is a power transmission wiring and may be formed of a metal material which is the same as that of the first auxiliary wiring  210 . 
     The first power terminal part  260  is formed in one edge portion of the first substrate  210 , for example, a middle portion of a first vertical edge of the first substrate  210 . The first power terminal part  260  may include a first anode power terminal  261  connected to one side of the first electrode  221  provided in the emission part  220 , a first cathode power terminal  263  connected to one side of the second electrode  225  provided in the emission part  220 , a first anode power transmission terminal  265  connected to one end of the first auxiliary wiring  240 , and a first cathode power transmission terminal  267  connected to one end of the second auxiliary wiring  250 . The first power terminal part  260  is electrically connected to a panel connection means adjacent to one side thereof. 
     The second power terminal part  270  is formed in the other edge portion of the first substrate  210 , for example, a middle portion of a second vertical edge of the first substrate  210 . The second power terminal part  270  may include a second anode power terminal  271  connected to the other side of the second electrode  225  provided in the emission part  220 , a second cathode power terminal  273  connected to the other side of the second electrode  225  provided in the emission part  220 , a second anode power transmission terminal  275  connected to the other end of the first auxiliary wiring  240 , and a second cathode power transmission terminal  277  connected to the other end of the second auxiliary wiring  250 . The second power terminal part  270  is electrically connected to a panel connection means adjacent to the other side thereof. 
     The second substrate  280  is formed to cover an upper portion of the first substrate  210  except the first and second power terminal parts  260  and  270  and acts as a protection substrate that protects the emission part  220 . In this case, the second substrate  280  may be opposite-bonded to the first substrate  210  to cover the encapsulation layer  230  and the first and second auxiliary wirings  240  and  250  through a laminating process using a substrate bonding member  290 , for example, an adhesive or an adhesive sheet. 
     In each of the plurality of lighting panels  1111  to  111   n  according to an embodiment of the present invention, the emission part  220  emits light with the lighting power which is supplied to the first and second electrodes  221  and  225  of the emission part  220  through the first and second power terminal parts  260  and  270 , and the light emitted from the emission part  220  is output to the outside through the first electrode  221 . 
       FIG. 5  is a diagram for describing each of a plurality of lighting panels according to another embodiment of the present invention illustrated in  FIG. 2 , and  FIG. 6  is a cross-sectional view taken along line II-II′ illustrated in  FIG. 5 . The drawings illustrate a configuration implemented by modifying the first and second auxiliary wirings in each of a plurality of lighting panels according to an embodiment of the present invention illustrated in  FIGS. 3 and 4 . Hereinafter, therefore, only the first and second auxiliary wirings will be described, and repetitive descriptions of the other same elements are omitted. 
     As seen in  FIGS. 5 and 6 , in each of a plurality of lighting panels  1111  to  111   n  according to another embodiment of the present invention, each of first and second auxiliary wirings  540  and  550  is provided on an outer surface (or a rear surface) of the second substrate  280 . 
     One end of the first auxiliary wiring  540  is connected to the first power terminal part  260 , namely, the first anode power transmission terminal  265 . The other end of the first auxiliary wiring  540  is connected to the second power terminal part  270 , namely, the second anode power transmission terminal  275 . 
     One end of the second auxiliary wiring  550  is connected to the first power terminal part  260 , namely, the first cathode power transmission terminal  267 . The other end of the second auxiliary wiring  550  is connected to the second power terminal part  270 , namely, the second cathode power transmission terminal  277 . 
     Each of the first and second auxiliary wirings  540  and  550  according to an embodiment may include a conductive pattern, deposited on a rear surface of the second substrate  280 , and a conductive tape that respectively connects both ends of the conductive pattern to the first and second power terminal parts  260  and  270 . 
     Each of the first and second auxiliary wirings  540  and  550  according to another embodiment may be a conductive tape which includes both ends respectively connected to the first and second power terminal parts  260  and  270  and is disposed on an outer surface  281  of the second substrate  280 . 
     In addition, the first and second auxiliary wirings  540  and  550  may be insulated from each other by an insulating member (not shown). The insulating member may be an insulating tape. 
     If the lighting apparatus according to an embodiment has a single emission structure and irradiates light onto the first substrate  210 , each of the first and second auxiliary wirings  540  and  550  according to an embodiment may be provided in a middle portion of the outer surface  281  of the second substrate  280  to overlap an emission area, or may be provided in an edge portion of the outer surface  281  of the second substrate  280  to overlap a non-emission area. Furthermore, if the lighting apparatus according to an embodiment has a dual emission structure, each of the first and second auxiliary wirings  540  and  550  according to another embodiment may be provided on the outer surface  281  of the second substrate  280  to overlap the non-emission area. 
     In each of the plurality of lighting panels  1111  to  111   n  according to another embodiment of the present invention, each of the first and second auxiliary wirings  540  and  550  may not be provided on the outer surface of the second substrate  280 , and as illustrated in  FIG. 7 , may be provided on an inner surface  282  of the second substrate  280  facing the first substrate  210 . In this case, each of the first and second auxiliary wirings  540  and  550  is surrounded by the substrate bonding member  290 , and thus, the insulating member is not needed. 
       FIG. 8  is a diagram for describing each of a plurality of intermediate connection members according to an embodiment illustrated in  FIG. 2 . 
     Referring to  FIGS. 2 to 8 , each of the plurality of middle connection members  121 - 1  to  121 - m  according to an embodiment electrically connects in parallel the first and second electrodes  221  and  225  between adjacent lighting panels. To this end, each of the plurality of middle connection members  121 - 1  to  121 - m  according to an embodiment includes a base substrate  310  and first to fourth parallel connection wirings  311 ,  313 ,  315  and  317 . 
     The base substrate  310  is a flexible substrate and is connected between the second power terminal part  270  of a lighting panel (hereinafter referred to as one lighting panel) adjacent to one side thereof and the first power terminal part  260  of a lighting panel (hereinafter referred to as other lighting panel) adjacent to the other side thereof. Here, with respect to the lengthwise direction X of the lighting apparatus, the one lighting panel may be defined as a lighting panel adjacent to a left side with respect to the panel connection means  120 , and the other lighting panel may be defined as a lighting panel adjacent to a right side with respect to the panel connection means  120 . 
     The first parallel connection wiring  311  is formed on the base substrate  310  and is connected between first electrodes  221  of adjacent lighting panels. That is, the first parallel connection wiring  311  is connected to the second anode power terminal  271  provided in the second power terminal part  270  of the one lighting panel and is connected to the first anode power terminal  261  provided in the first power terminal part  260  of the other lighting panel. One end of the first parallel connection wiring  311  is connected to the second anode power terminal  271  through a first connection terminal  311   a , and the other end of the first parallel connection wiring  311  is connected to the first anode power terminal  261  through a second connection terminal  311   b.    
     The second parallel connection wiring  313  is formed on the base substrate  310 , electrically disconnected from the first parallel connection wiring  311 , and connected between second electrodes  225  of adjacent lighting panels. That is, the second parallel connection wiring  313  is connected to the second cathode power terminal  273  provided in the second power terminal part  270  of the one lighting panel and is connected to the first cathode power terminal  263  provided in the first power terminal part  260  of the other lighting panel. One end of the second parallel connection wiring  313  is connected to the second cathode power terminal  273  through a third connection terminal  313   a , and the other end of the second parallel connection wiring  313  is connected to the first cathode power terminal  263  through a fourth connection terminal  313   b.    
     The third parallel connection wiring  315  is formed on the base substrate  310 , electrically disconnected from the first and second parallel connection wirings  311  and  313 , connected between first auxiliary wirings  240  of adjacent lighting panels, and connected to the first parallel connection wiring  311 . That is, the third parallel connection wiring  315  is connected to the second anode power transmission terminal  275  provided in the second power terminal part  270  of the one lighting panel, connected to the first anode power transmission terminal  265  provided in the first power terminal part  260  of the other lighting panel, and connected to the first parallel connection wiring  311  through a first bridge wiring  316  on the base substrate  310 . One end of the third parallel connection wiring  315  is connected to the second anode power transmission terminal  275  through a fifth connection terminal  315   a , and the other end of the third parallel connection wiring  315  is connected to the first anode power transmission terminal  265  through a sixth connection terminal  315   b.    
     The fourth parallel connection wiring  317  is formed on the base substrate  310 , electrically disconnected from first to third serial connection wirings  311 ,  313  and  315 , connected between second auxiliary wirings  250  of adjacent lighting panels, and connected to the second parallel connection wiring  313 . That is, the fourth parallel connection wiring  317  is connected to the second cathode power transmission terminal  277  provided in the second power terminal part  270  of the one lighting panel, connected to the first cathode power transmission terminal  267  provided in the first power terminal part  260  of the other lighting panel, and connected to the second parallel connection wiring  313  through a second bridge wiring  318  on the base substrate  310 . One end of the fourth parallel connection wiring  317  is connected to the second cathode power transmission terminal  277  through a seventh connection terminal  317   a , and the other end of the fourth parallel connection wiring  317  is connected to the first cathode power transmission terminal  267  through an eighth connection terminal  317   b.    
     Each of the plurality of middle connection members  121 - 1  to  121 - m  according to an embodiment electrically connects in parallel the first and second electrodes  221  and  225  between adjacent lighting panels and supplies the lighting power to the first and second power terminal parts  260  and  270  of each of the lighting panels  1111  to  111   n . Therefore, in the present invention, in a case where the lighting panels  1111  to  111   n  are driven in parallel, the lighting power is simultaneously supplied to one side and the other side of the emission part  220  provided in each of the lighting panels  1111  to  111   n , thereby increasing the emission uniformity of each of the lighting panels  1111  to  111   n . Also, the present invention transfers the lighting power to a next-end lighting panel through separate auxiliary wirings  240  and  250  provided in each of the lighting panels  1111  to  111   n , and thus, can minimize the voltage drop of the lighting power supplied to each of the lighting panels  1111  to  111   n.    
       FIG. 9  is a diagram for describing each of a plurality of middle connection members according to another embodiment illustrated in  FIG. 2 . 
     Referring to  FIGS. 2 to 7 and 9 , each of a plurality of middle connection members  121 - 1  to  121 - m  according to another embodiment electrically connects in parallel first and second electrodes  221  and  225  between adjacent lighting panels. To this end, each of the plurality of middle connection members  121 - 1  to  121 - m  according to another embodiment includes a base substrate  410 , first and second connection wirings  411  and  413 , and first and second serial connection wirings  415  and  417 . 
     The base substrate  410  is a flexible substrate and is connected between the second power terminal part  270  of a lighting panel (hereinafter referred to as one lighting panel) adjacent to one side thereof and the first power terminal part  260  of a lighting panel (hereinafter referred to as other lighting panel) adjacent to the other side thereof. Here, with respect to the lengthwise direction X of the lighting apparatus, the one lighting panel may be defined as a lighting panel adjacent to a left side with respect to each panel connection means  120 , and the other lighting panel may be defined as a lighting panel adjacent to a right side with respect to each panel connection means  120 . 
     The first connection wiring  411  is formed on the base substrate  410  and connects the other side of the first auxiliary wiring  240  and the other side of the first electrode  221  provided in the one lighting panel. That is, the first connection wiring  411  is connected to the second anode power terminal  271  provided in the second power terminal part  270  of the one lighting panel and is connected to the second anode power transmission terminal  275  provided in the second power terminal part  270  of the one lighting panel. In this case, one end of the first connection wiring  411  is connected to the second anode power terminal  271  through a first connection terminal T 1 , and the other end of the first connection wiring  411  is connected to the second anode power transmission terminal  275  through a second connection terminal T 2 . 
     The second connection wiring  413  is formed on the base substrate  410  and is electrically disconnected from the first connection wiring  411 , and connects one side of the first auxiliary wiring  240  to one side of the first electrode  221  provided in the other lighting panel. That is, the second connection wiring  413  is connected to the first anode power terminal  261  provided in the first power terminal part  260  of the other lighting panel and is connected to the first anode power transmission terminal  265  provided in the first power terminal part  260  of the other lighting panel. In this case, one end of the second connection wiring  413  is connected to the first anode power terminal  261  through a third connection terminal T 3 , and the other end of the second connection wiring  413  is connected to the first anode power transmission terminal  265  through a fourth connection terminal T 4 . 
     The first and second connection wirings  411  and  413  connect the first auxiliary wiring  240  and the first electrode  221  of each of the lighting panels  1111  to  111   n  in the form of a closed loop, thereby making the lighting power supplied to the first electrode  221  of each of the lighting panels  1111  to  111   n  uniform. 
     The first serial connection wiring  415  is formed on the base substrate  410  and is electrically disconnected from the first and second connection wirings  411  and  413 , and connects one side of the second connection wiring  413  to the second electrode  225  provided in the one lighting panel. That is, the first serial connection wiring  415  is connected to the second cathode power terminal  273  provided in the second power terminal  270  of the one lighting panel and is connected to the second connection wiring  413  on the base substrate  410 . One end of the first serial connection wiring  415  is connected to the second cathode power terminal  273  through a fifth connection terminal T 5 , and the other end of the first serial connection wiring  415  is connected to the second connection wiring  413 . The first serial connection wiring  415  connects the second electrode  225  provided in the one lighting panel to the first electrode  221  provided in the other lighting panel, thereby electrically connecting the one lighting panel to the other lighting panel. 
     The second serial connection wiring  417  is formed on the base substrate  410 , electrically disconnected from first to third serial connection wirings  411 ,  413  and  415 , and electrically connected between second auxiliary wirings  250  of adjacent lighting panels. That is, the second serial connection wiring  417  is connected to the second cathode power transmission terminal  277  provided in the second power terminal part  270  of the one lighting panel and is connected to the first cathode power transmission terminal  267  provided in the first power terminal part  260  of the other lighting panel. One end of the second serial connection wiring  417  is connected to the second cathode power transmission terminal  277  through a sixth connection terminal T 6 , and the other end of the second serial connection wiring  417  is connected to the first cathode power transmission terminal  267  through a seventh connection terminal T 7 . The second serial connection wiring  417  serially connects the second auxiliary wirings  240  of the respective lighting panels  1111  to  111   n . Therefore, each of the serially connected second auxiliary wirings  240  of the respective lighting panels  1111  to  111   n  acts as a power cable that is provided in each of the lighting panels  1111  to  111   n  and the panel connection means  120  and is not exposed to the outside of the lighting apparatus. 
     An eighth connection terminal T 8 , which is provided in the first power terminal part  260  and is connected to the first cathode power terminal  263 , is additionally provided on the base substrate  410 . 
     Each of the plurality of middle connection members  121 - 1  to  121 - m  according to another embodiment electrically and serially connects the first and second electrodes  221  and  225  between adjacent lighting panels and supplies the lighting power to the first and second power terminal parts  260  and  270  of each of the lighting panels  1111  to  111   n . Therefore, in the present invention, the lighting panels  1111  to  111   n  may be electrically and serially connected to each other though the panel connection means  120  even without a power cable exposed to the outside of the lighting apparatus, thereby increasing expandability of a serial connection between the plurality of lighting panels  1111  to  111   n.    
       FIG. 10  is a diagram for describing each of a plurality of end connection members according to an embodiment illustrated in  FIG. 2 . 
     Referring to  FIGS. 2 to 7 and 10 , an end connection member  123  according to an embodiment of the present invention connects the first auxiliary wiring  240  and the first electrode provided in the last lighting panel  111   n  and connects the second auxiliary wiring  250  and the second electrode provided in the last lighting panel  111   n . To this end, the end connection member  123  according to an embodiment includes a base substrate  510  and first and second end connection wirings  511  and  513 . 
     The base substrate  510  is a flexible substrate and is connected to the second power terminal part  270  of the last lighting panel. 
     The first end connection wiring  511  is formed on the base substrate  510  and connects the other side of the first auxiliary wiring  240  and the other side of the first electrode  221  provided in the last lighting apparatus  111   n . That is, the first end connection wiring  511  is connected to the second anode power terminal  271  and the second anode power transmission terminal  275  provided in the second power terminal part  270  of the last lighting panel  111   n . In this case, one end of the first end connection wiring  511  is connected to the second anode power terminal  271  through a first connection terminal T 1 , and the other end of the first end connection wiring  511  is connected to the second anode power transmission terminal  275  through a second connection terminal T 2 . 
     The second end connection wiring  513  is formed on the base substrate  510  and connects the other side of the second auxiliary wiring  250  and the other side of the second electrode  225  provided in the last lighting apparatus  111   n . That is, the second end connection wiring  513  is connected to the second cathode power terminal  273  and the second cathode power transmission terminal  277  provided in the second power terminal part  270  of the last lighting panel  111   n . In this case, one end of the second end connection wiring  513  is connected to the second cathode power terminal  273  through a third connection terminal T 3 , and the other end of the second end connection wiring  513  is connected to the second cathode power transmission terminal  277  through a fourth connection terminal T 4 . 
     In addition, the end connection member  123  according to another embodiment of the present invention may have a structure which is the same as that of the middle connection members  121 - 1  to  121 - m  according to an embodiment of the present invention illustrated in  FIG. 8 . 
     The present invention as described above are not limited to the above-described embodiments and the accompanying drawings and those skilled in the art will clearly appreciate that various modifications, deformations, and substitutions are possible without departing from the scope and spirit of the invention. Therefore, it should be construed that the scope of the present invention is defined by the below-described claims instead of the detailed description, and the meanings and scope of the claims and all variations or modified forms inferred from their equivalent concepts are included in the scope of the present invention.