KR101591335B1 - Lighting Apparatus Including Organic Light Emitting Diode Array And Method Of Fabricating The Same - Google Patents

Lighting Apparatus Including Organic Light Emitting Diode Array And Method Of Fabricating The Same Download PDF

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KR101591335B1
KR101591335B1 KR1020090077191A KR20090077191A KR101591335B1 KR 101591335 B1 KR101591335 B1 KR 101591335B1 KR 1020090077191 A KR1020090077191 A KR 1020090077191A KR 20090077191 A KR20090077191 A KR 20090077191A KR 101591335 B1 KR101591335 B1 KR 101591335B1
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plurality
substrate
light emitting
power supply
lines
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KR1020090077191A
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KR20110019589A (en
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박종현
박태한
이경훈
정현철
유동희
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엘지디스플레이 주식회사
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y02B20/34Inorganic LEDs
    • Y02B20/341Specially adapted circuits
    • Y02B20/343Linear regulators

Abstract

The present invention provides a power supply apparatus comprising: a power supply unit for supplying power; A substrate connected to the power supply unit and having a plurality of emission regions defined therein; A plurality of power lines each extending from one edge of the substrate to a central portion of the substrate; A plurality of first connection wirings and a plurality of second connection wirings respectively formed at upper and lower halves of the substrate and connected to the plurality of power supply wirings at the central portion of the substrate to receive the power supply; And a plurality of organic light emitting diodes (OLEDs) connected to the plurality of first connection lines and the plurality of second connection lines, respectively, and formed in the plurality of emission regions.
Power supply, organic light emitting diode,

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting diode (OLED) array,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus to which power is applied to a central portion of a plurality of organic light emitting diode (OLED) arrays and a method of manufacturing the lighting apparatus.

2. Description of the Related Art In recent years, light emitting diodes (LEDs) have been increasingly used as light sources for various lighting apparatuses instead of fluorescent lamps. Light emitting diodes (LEDs) are sometimes referred to as electroluminescent devices do.

In particular, an organic light emitting diode (OLED) using an organic material as a light emitting material layer among such light emitting diodes is attracting attention as a manufacturing convenience.

Such an organic light emitting diode can display all colors (red, green, and blue), which are three primary colors of light, and has a small power consumption.

That is, an organic light emitting diode array composed of a plurality of organic light emitting diodes arranged in a matrix type on a substrate and wirings connecting the respective organic light emitting diodes are formed, and the power of the power supply unit is applied through the wirings, have.

1 is an equivalent circuit diagram of a lighting device including a conventional organic light emitting diode array.

1, the conventional lighting apparatus 10 includes a substrate 20 in which a plurality of organic light emitting diodes D are formed in a matrix type, a power supply unit 30 connected to the substrate 20 to supply power, ).

Accordingly, a plurality of light emitting regions E1, E2, and E3 are defined in the substrate 20, and organic light emitting diodes D are formed in each light emitting region to form an organic light emitting diode array.

A plurality of power input lines 32 extending from the power supply unit 30 are connected to a plurality of power input pads 22 formed on the substrate.

A plurality of power input pads 22 are connected to a plurality of connection wirings 24 formed on the substrate 20 and a plurality of connection wirings 24 are connected to the light emitting diodes D of the respective light emission areas E1, E2, Lt; / RTI >

Although not shown, the organic light emitting diode D has a structure in which the auxiliary electrode, the first electrode, the light emitting material layer, and the second electrode are sequentially stacked, and the second electrode is connected to the grounded voltage pad 26.

The power supplied from the power supply unit 30 to the organic light emitting diodes D of the respective light emitting regions E1, E2 and E3 through the plurality of power supply input lines 32 and the plurality of connection wirings 24 is supplied to a plurality of The power source line 32, the plurality of connection wirings 24 and the plurality of organic light emitting diodes D undergo voltage drop due to resistance and escape to the low voltage pad 26.

In this case, the plurality of power input lines 32 may be formed to have a sufficiently large cross-sectional area with a material having a sufficiently low specific resistance so that the voltage drop can be neglected. However, The wiring 24 and the plurality of organic light emitting diodes D can not be formed with a negligible voltage drop due to the area of the substrate 20 or the limitation due to the manufacturing equipment.

The first resistor R1 represents an equivalent resistance of each of the plurality of connection wirings 24 corresponding to the respective light emitting regions E1, E2 and E3 and the second resistor R2 represents the equivalent resistance of each of the plurality of organic light emitting diodes D And the third resistor R 3 represents the equivalent resistance of the second electrode of each of the plurality of organic light emitting diodes D 1 and D 2.

In this case, it is general that the first resistor R1 is smaller than the second resistor R2 and the third resistor R3 is smaller than the first resistor R1. The second and third resistors R2, Since the first resistor R1 has a different value depending on the positions of the light emitting regions E1, E2 and E3, the organic light emitting diode D may have the same value as that of the regions E1, E2 and E3, E2, and E3 are supplied with different power depending on the positions of the light emitting regions E1, E2, and E3 by the first resistor R1.

That is, the resistances of the first, second, and third light emitting regions E1, E2, and E3 to the organic light emitting diode D are twice as large as the first resistor R1, twice the first resistor R1, (3R1) of the first resistor R1 so that the power supplied to the organic light emitting diode D of the first light emitting region E1 and the power supplied to the organic light emitting diode D of the third light emitting region E3 ) Have different voltage values, which results in luminance unevenness by the position of the lighting apparatus.

2 is a diagram showing luminance distribution of a conventional illumination device including an organic light emitting diode array.

As shown in Fig. 2, the substrate 20 of the lighting apparatus 10 exhibits different luminance for each of the plurality of light emitting regions E1, E2, and E3.

That is, the first brightness B1 of the portion corresponding to the first light emitting region E1 is higher than the second brightness B2 of the portion corresponding to the second light emitting region E2, The second brightness B2 of the corresponding portion is higher than the third brightness B3 of the portion corresponding to the third light emitting region E3. (B1 > B2 > B3)

Therefore, the illumination device 10 exhibits uneven brightness characteristics in which the brightness decreases from one side of the substrate 20 to which power is supplied to the other side, and such unevenness of luminance causes a problem that the user's eyesight is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to improve the visibility and visibility of a lighting apparatus by supplying power to a central portion of an organic light emitting diode array in an illumination apparatus including an organic light emitting diode array .

It is another object of the present invention to provide a power supply in consideration of the drop in the absolute value of the voltage in the connection wiring formed on the substrate of the lighting apparatus.

According to an aspect of the present invention, there is provided a power supply apparatus including: a power supply unit for supplying power; A substrate connected to the power supply unit and having a plurality of emission regions defined therein; A plurality of power lines each extending from one edge of the substrate to a central portion of the substrate; A plurality of first connection wirings and a plurality of second connection wirings respectively formed at upper and lower halves of the substrate and connected to the plurality of power supply wirings at the central portion of the substrate to receive the power supply; And a plurality of organic light emitting diodes (OLEDs) connected to the plurality of first connection lines and the plurality of second connection lines, respectively, and formed in the plurality of emission regions.

The illuminating device has a characteristic in which the brightness gradually decreases from the central portion of the substrate to the one edge portion of the substrate.

The illumination device may further include a plurality of power input lines for transmitting the power from the power supply unit to the substrate, and may be formed at one edge of the substrate, A plurality of power input pads respectively connected to the power wiring; And a plurality of base low voltage pads formed at one edge of the substrate and connected to the plurality of light emitting diodes, respectively.

Each of the plurality of organic light emitting diodes includes a plurality of organic light emitting diodes, each of the plurality of organic light emitting diodes being formed in a square shape on the substrate, the auxiliary electrode being connected to one of the plurality of first connection wiring lines and the plurality of second connection wiring lines; A first electrode formed on the auxiliary electrode in a rectangular plate shape; An insulating layer formed on the first electrode and having an opening exposing the first electrode; A light emitting material layer formed on the insulating layer and contacting the first electrode through the opening; And a second electrode formed on the light emitting material layer and connected to the base low voltage pad.

According to another aspect of the present invention, there is provided a plasma display apparatus comprising: first and second power supply units for supplying power; A substrate connected to the first and second power supply units and defining a plurality of light emitting regions; A plurality of first power supply lines each extending from one edge of the substrate to a central portion of the substrate; A plurality of second power supply lines each extending from the other edge of the substrate to the central portion of the substrate; A plurality of first connection wirings formed at an upper half of the substrate and connected to the plurality of first power supply wirings at the central portion of the substrate to receive the power supply; A plurality of second connection wirings formed at a lower half of the substrate and connected to the plurality of second power supply wirings at the central portion of the substrate to receive the power supply; And a plurality of organic light emitting diodes (OLEDs) connected to the plurality of first connection lines and the plurality of second connection lines, respectively, and formed in the plurality of emission regions.

The illumination device may include: a plurality of first power input lines for transmitting the power from the first power supply unit to the substrate; A plurality of second power input lines for transmitting the power from the second power supply to the substrate; A plurality of first power input pads formed at one edge of the substrate and connected to the plurality of first power input lines and the plurality of first power lines, respectively; A plurality of second power input pads formed on the other edge of the substrate and connected to the plurality of second power input lines and the plurality of second power lines, respectively; And a plurality of base low voltage pads formed at one edge of the substrate and connected to the plurality of light emitting diodes, respectively.

On the other hand, according to the present invention, there is provided a plasma display panel comprising: a substrate on which a plurality of light emitting regions are defined; a plurality of power supply lines extending from one edge of the substrate to a central portion of the substrate; Forming a plurality of first connection wirings and a plurality of second connection wirings connected to the plurality of power supply wirings at the central portion of the first connection wirings; And forming a plurality of organic light emitting diodes connected to the plurality of first connection wirings and the plurality of second connection wirings in the plurality of light emitting regions.

The step of forming the plurality of organic light emitting diodes may include forming a square-shaped auxiliary electrode connected to one of the plurality of first connection wiring lines and the plurality of second connection wiring lines on the substrate, ; Forming a first electrode having a rectangular plate shape on the auxiliary electrode; Forming an insulating layer on the first electrode, the insulating layer having an opening exposing the first electrode; Forming a light emitting material layer on the insulating layer, the light emitting material layer contacting the first electrode through the opening; And forming a second electrode connected to the base low voltage pad on the light emitting material layer.

The plurality of power supply lines, the plurality of first connection lines, the plurality of second connection lines, and the auxiliary electrodes may be formed through the same process.

As described above, the illumination device including the organic light emitting diode array according to the present invention has an advantage that the visual sense and visibility of the illumination device are improved by supplying power to the central part of the organic light emitting diode array.

Further, there is an advantage that the brightness of the illumination device is compensated by supplying the power in consideration of the drop in the absolute value of the voltage in the connection wiring formed on the substrate of the illumination device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

3 is an equivalent circuit diagram of a lighting apparatus including an organic light emitting diode array according to a first embodiment of the present invention.

3, the lighting apparatus 110 according to the first embodiment of the present invention includes a substrate 120 having a plurality of organic light emitting diodes D formed in a matrix type, And a power supply unit 130 for supplying power.

Accordingly, a plurality of light emitting regions E1, En-1, En, En + 1, En +2, and E2n are defined in the substrate 120 and organic light emitting diodes D are formed in each light emitting region, Thereby forming an organic light emitting diode array.

The substrate 120 may be made of a transparent material such as glass.

A plurality of power input lines 132 extending from the power supply unit 130 are connected to a plurality of power input pads 122 formed on one side of the substrate 120.

The power supply unit 130 may be configured in the form of an integrated circuit (IC), and the plurality of power input lines 132 may be formed in the form of a flexible printed circuit (FPC) And may be connected to a plurality of power input pads 122 in a method.

A plurality of power input pads 122 are formed on the substrate 120 in parallel with each other and are connected to a plurality of power lines 123 extending to the center of the substrate 120.

The plurality of power supply wirings 123 are connected to a plurality of first and second connection wirings 124 and 125 at a central portion of the substrate 120. A plurality of first and second power supply wirings 123, The two connection wirings 124 and 125 are formed on the upper half and the lower half of the substrate 120, respectively.

The power supply wiring 123 extends from the power supply input pad 122 formed on one side of the substrate 120 to the central portion of the substrate 120 and is connected to the first The first connection wiring 124 is formed in the first to nth light emitting regions E1 to En and the second connection wiring 124 is formed in the (n + 1) th to (n + 125 are formed.

The power supply wiring 123 is connected to the first and second connection wirings 124 and 125 between the nth and (n + 1) th emission regions En and En + 1 which are the center portions of the substrate 120.

The organic light emitting diode D includes an auxiliary electrode (132 in FIG. 5), a first electrode (134 in FIG. 5), a light emitting material layer (138 in FIG. 5), and a second electrode And the second electrode 140 is connected to the ground voltage pad 126.

Accordingly, the power source output from the power supply unit 130 may include a plurality of power source input lines 132, a plurality of power source lines 123, a plurality of first connection lines 124, or a plurality of power source lines 123, depending on the position of the organic light emitting diode D Supplied to the organic light emitting diodes D of the respective light emitting regions E1 to E2n via the power input line 132 of the power supply line 132, the plurality of power supply lines 123 and the plurality of second connection lines 125, 126.

At this time, the plurality of power input lines 132 may be formed to have a sufficiently large cross-sectional area with a material having a sufficiently low specific resistance so that the voltage drop can be neglected, and the plurality of power lines 123 can be neglectably low It is not necessary to consider the voltage drop of the power source and the plurality of power source input lines 132 and the plurality of power source lines 123 are equivalent resistors because the same resistance is applied to all the organic light emitting diodes D .

Assuming that the plurality of power supply wirings 123, the plurality of first connection wirings 124, and the plurality of second connection wirings 125 are formed to have the same thickness and the same width, Represents an equivalent resistance of each of the plurality of first connection wiring lines 124 and the plurality of second connection wiring lines 125 corresponding to the respective light emitting regions E1 to E2n and the second resistor R2 represents the equivalent resistance of each of the plurality of organic light emitting diodes D represents the equivalent resistance of each of the auxiliary electrodes 132, the first electrode 134 and the emissive material layer 138 and the third resistor R3 represents the equivalent resistance of each of the plurality of organic light emitting diodes D, 140 < / RTI >

In this case, the first resistor R1 is smaller than the second resistor R2 and the third resistor R3 is smaller than the first resistor R1. For example, the first resistor R1 may be 1 to 100 Ω, 2 The resistance (R2) may be in the range of 1000 to 10000?, And the third resistance (R3) may be in the range of 0.1? 1 ?.

The second and third resistors R2 and R3 have the same value for the positions of the light emitting regions E1 to E2n but the first resistor R1 has a different value depending on the positions of the light emitting regions E1 to E2n The organic light emitting diode D is supplied with a different power depending on the positions of the light emitting regions E1 to E2n by the first resistor R1.

That is, the resistance of the n-th and (n + 1) -th emission regions En and En + 1 to the organic light emitting diode D is the resistance of the first resistor R1, the n- 1 and En + 2) to the organic light emitting diode D becomes twice as much as the first resistor R1 (2R1), and the first and second n-emission regions (N1) of the first resistor R1 to the organic light emitting diodes D of the first and second transistors E1 and E2n.

Therefore, the power supplied to the organic light emitting diodes D of the (n-1) th and (n + 2) th light emitting regions En-1 and En + And the lowest voltage power is supplied to the organic light emitting diodes D of the first and second n light emitting regions E1 and E2n.

As a result, a power source having a lower voltage is supplied from the light emitting region in the central portion of the substrate 120 to the light emitting region in the upper and lower ends of the substrate 120. This is a lighting device having a maximum value at the central portion and gradually decreasing toward the edge 110).

For example, the voltage of the power source can be reduced by about 0.02 V while passing through the connection wiring corresponding to one light emitting region.

Therefore, when the voltage of the power supplied from the power supply unit 130 is A (V), the voltage of the power source supplied to the organic light emitting diodes D of the nth and (n + 1) The voltage supplied to the organic light emitting diodes D of the n-1 and the n + 2 light emitting regions En-1 and En + 2 is A 0.02 (n + 1) (V), and the voltage supplied to the organic light emitting diode D of the first and second n-emission regions E1 and E2n is A 0.02 (2n) (V) The brightness gradually decreases as the brightness increases.

Here, the voltage A (V) of the supplied power source is a positive or negative value, and the base low-voltage pad 126 can be grounded.

The first electrode 134 and the second electrode 140 of the organic light emitting diode D become the anode and the cathode respectively when the voltage is A (V) The voltage supplied to the organic light emitting diodes D of the second n light emitting regions E1 and E2n becomes A-0.02 (2n) (V) The first electrode 134 and the second electrode 140 become cathodes and anodes, respectively, and the voltage increases (decreases in absolute value) toward the edge of the first and second light emitting regions E1 and E2n, The voltage supplied to the light emitting diode D becomes A + 0.02 (2n) (V).

4 is a diagram illustrating luminance distribution of a lighting apparatus including the organic light emitting diode array according to the first embodiment of the present invention.

4, the substrate 120 of the illumination device 110 exhibits a different luminance for each of the plurality of light emitting regions E1 to E2n, and has the highest luminance value at the central portion of the substrate 120, And has a luminance value that gradually decreases as it goes down.

That is, the nth and (n + 1) th brightness (Bn, Bn + 1) of the portion corresponding to the nth and (n + 1) th light emitting regions En and En are the highest values, The n-1 and the (n + 2) -th brightness (Bn-1, Bn + 2) of the portion corresponding to the +2 light emitting regions En-1 and En + , The nth and n + 1th luminances Bn and Bn + 1 of the portion corresponding to the first and second n light-emitting regions E1 and E2n, (B1, B2n) is the minimum value. (Bn> Bn-1 >> B1, Bn + 1> Bn + 2 >> B2n)

Accordingly, since the central portion of the substrate 120 has the highest luminance and the luminance gradually decreases toward the edge of the substrate 120, the illumination device 110 has improved luminosity or visibility.

The construction and manufacturing method of the lighting apparatus 110 will be described with reference to the drawings.

FIG. 5 is a plan view of a substrate on which an organic light emitting diode array according to a first embodiment of the present invention is formed, and FIG. 6 is a cross-sectional view taken along a line VI-VI in FIG.

(Cu), molybdenum (Mo), and silver (Ag) having relatively low resistance characteristics are formed on a transparent substrate 120 on which a plurality of light emitting regions E1 to E2n are defined, as shown in FIGS. 5 and 6, A plurality of power supply wirings 123, a plurality of first connection wirings 124, and a plurality of second power supply wirings 124. The plurality of power supply wirings 123 are connected to the plurality of power supply wirings 123 through a photolithographic process, The second connection wiring 125 and the auxiliary electrode 132 are formed.

A plurality of power input pads 122 are formed on one side of the substrate 120. A plurality of power feed lines 123 extend from the plurality of power input pads 122 to the central portion of the substrate 120 in parallel with each other, The first connection wirings 124 and the plurality of second connection wirings 125 are formed on the upper and lower halves of the substrate 120 and connected to the plurality of power supply wirings 123 at the central portion of the substrate 120.

The auxiliary electrode 132 is formed in a square ring shape at the edge portions of the respective light emitting regions E1 to E2n.

The plurality of power supply wirings 123, the plurality of first connection wirings 124 and the plurality of second connection wirings 125 each have a width w of 10 to 1000 mu m, a thickness t of 0.1 to 10 mu m, Can be designed to have a length (d) of ~1000000 m.

A transparent conductive material such as ITO (indium-tin-oxide) or IZO (indium-zinc-oxide) is deposited on the auxiliary electrode 132 of each of the light emitting regions E1 to E2n, The first electrode 134 is formed.

The first electrode 134 is in contact with the auxiliary electrode 132 and is electrically connected to each other and is formed in a rectangular shape on the entire inner surface of each of the light emitting regions E1 to E2n. For example, the first electrode 134 may have a thickness in the range of 0.1 to 0.3 μm have.

An inorganic insulating material such as silicon nitride (SiNx) or silicon oxide (SiOx) or an organic insulating material such as polyimide (PI), benzocyclobutene (BCB), or acrylic resin is deposited on the first electrode 134 The insulating layer 136 having the first and second openings 136a and 136b is formed through a photolithography process or the like.

The first opening 136a is formed in each of the light emitting regions E1 to E2n to expose the first electrode 134 and the second opening 136b is formed on one side of the substrate 120 to form the power input pad 122, And the insulating layer 136 may have a thickness in the range of, for example, 0.2 to 0.8 占 퐉.

An organic light emitting material is deposited on the insulating layer 136 to form a light emitting material layer 138.

The light emitting material layer 138 may be formed by a thermal evaporation method using a shadow mask. The light emitting material layer 138 may be formed in a rectangular shape in each of the light emitting regions E1 to E2n and may be formed through the first opening 136a And contacts the first electrode 134.

Since the edge portion of the first electrode 134 is covered with the insulating layer 136, deterioration of the edge portion such as peeling due to contact with the light emitting material layer 138 can be prevented.

A second electrode 140 which is in contact with the light emitting material layer 138 through a photolithography process or the like after depositing a second metal material such as aluminum (Al) having a relatively low resistance property on the light emitting material layer 138, A light emitting material layer 138, and an organic light emitting diode (LED) 140 including a first electrode 134, a light emitting material layer 138, and a second electrode 140 by forming a base low voltage pad 126 on the insulating layer 136 on one side of the substrate 120 D).

The second electrodes 140 of the respective light emitting regions E1 to E2n are connected to each other to be electrically connected to the ground voltage pad 126.

Although FIGS. 4 and 5 illustrate the case where the second electrodes 140 are connected vertically, in another embodiment, the second electrodes may be connected horizontally or vertically so as to cover the entire substrate.

4 and 5, the first electrode 134 is an anode and the second electrode 140 is a cathode having a lower work function value than the first electrode 134, and the light emitting material layer 138 are emitted to the lower portion of the substrate 120. However, in another embodiment, the first and second electrodes may be a cathode and an anode, respectively, using different metal materials, The thickness of the electrode may be adjusted so that the light emitted from the light emitting material layer is emitted upward.

In the first embodiment, a lighting apparatus employing one power supply unit is taken as an example, but the lighting apparatus according to another embodiment may employ two or more power supply units.

7 is an equivalent circuit diagram of a lighting apparatus according to a second embodiment of the present invention, in which the lighting apparatus including an organic light emitting diode array is shown.

7, the illumination device 210 according to the second embodiment of the present invention includes a substrate 220 in which a plurality of organic light emitting diodes D are formed in a matrix type, And first and second power supply units 230a and 230b for supplying the same power.

Accordingly, a plurality of light emitting regions E1 to E2n are defined on the substrate 220, and organic light emitting diodes D are formed in the respective light emitting regions to form an organic light emitting diode array.

A plurality of first power input lines 232a and a plurality of second power input lines 232b extending from the first and second power supply units 230a and 230b are electrically connected to a plurality of first power input Pad 222a and a plurality of second power input pads 222b.

That is, a plurality of first power input lines 232a extending from the first power supply 230a are connected to a plurality of first power input pads 222a formed on one side of the substrate 220, A plurality of second power input lines 232b extending from the first power input pad 230b are connected to a plurality of second power input pads 222b formed on a lower side of the substrate 220. [

The first and second power supply units 230a and 230b may be configured as an integrated circuit (IC), and the first and second power input lines 232a and 232b may be a flexible printed circuit The FPC may be connected to a plurality of first power input pads 222a and a plurality of second power input pads 222b by a method such as soldering.

A plurality of first power input pads 222a and a plurality of second power input pads 222b are formed in parallel with each other on the upper and lower edges of the substrate 220, The wiring 223a and the plurality of second power supply wirings 223b, respectively.

A plurality of first power supply wirings 223a are connected to a plurality of first connection wirings 224 at a central portion of the substrate 220 and a plurality of second power supply wirings 223a are connected to a plurality of first power supply wirings 223a at a central portion of the substrate 220. [ 2 connection wiring 225, as shown in FIG.

The plurality of first connection wirings 224 and the plurality of second connection wirings 225 are arranged in parallel to the first power supply wiring 223a and the plurality of second power supply wirings 223b, And is formed in the lower half.

The first power supply wiring 223a extends from the first power supply input pad 222a formed at one side of the upper side of the substrate 220 to the central portion of the substrate 220, The second power supply wiring 223b is connected to the first connection wiring 224 formed on the first to nth light emitting regions E1 to En on the upper half of the substrate 220 at a central portion of the substrate 220, The second connection wiring 225 (225) formed in the (n + 1) th to the (2n + 1) th to (2n) th light emitting regions En + 1 to E2n extending from the formed second power input pad 222b to the center of the substrate 220, ) At the center of the substrate 220.

Although not shown, the organic light emitting diode D has a structure in which an auxiliary electrode, a first electrode, a light emitting material layer, and a second electrode are sequentially stacked, and the second electrode is connected to the ground voltage pad 226.

The power outputted from the first power supply 230a is supplied to the substrate 220 through the plurality of first power supply lines 232a, the plurality of first power supply lines 223a and the plurality of first connection lines 224, The organic light emitting diode D formed in the first to nth light emitting regions E1 to En of the upper half and the power outputted from the second power supply portion 230b are supplied to the plurality of second power input lines 232b, And the organic light emitting diode D formed in the (n + 1) th to (n + 2) th to (n + 2) th to (n + 2) th light emitting regions E2n to E2n as the lower half of the substrate 220 through the second power supply wiring 223b and the plurality of second connection wirings 225, And then output to the base low voltage pad 226. [

At this time, the plurality of first power input lines 232a and the plurality of second power input lines 232b may be formed to have a sufficiently large cross-sectional area with a material having a sufficiently low specific resistance so that the voltage drop can be neglected have.

Although the plurality of first power supply lines 223a and the plurality of second power supply lines 223b do not have negligible resistance, the same resistance is applied to the organic light emitting diodes D in the upper half and the lower half of the substrate 220, The plurality of first power supply wirings 223a and the plurality of second power supply wirings 223b extend from the edge portion to the center portion of the substrate 220 and exhibit substantially the same voltage drop. The same resistance is applied to all organic light emitting diodes (D) irrespective of the upper and lower halves.

Accordingly, a plurality of first power input lines 232a, a plurality of second power input lines 232b, a plurality of first power supply lines 223a, and a plurality of second power supply lines 223b may be considered for voltage drop of the power supply It is not necessary and is not represented by equivalent resistance.

Here, the plurality of first power supply wirings 223a, the plurality of second power supply wirings 223b, the plurality of first connection wirings 224, and the plurality of second connection wirings 225 all have the same thickness and the same width The first resistor R1 represents an equivalent resistance of each of the plurality of first connection wiring lines 224 and the plurality of second connection wiring lines 225 corresponding to the respective light emitting regions E1 to E2n, The second resistor R2 represents the equivalent resistance of the auxiliary electrode, the first electrode and the light emitting material layer of each of the plurality of organic light emitting diodes D, and the third resistor represents the equivalent resistance of the second electrode of each of the plurality of organic light emitting diodes D Equivalent resistance.

In this case, the first resistor R1 is smaller than the second resistor R2 and the third resistor R3 is smaller than the first resistor R1. For example, the first resistor R1 may be 1 to 100 Ω, 2 The resistance R2 may be a value in the range of 1000 to 10000 OMEGA, and the third resistance R3 may be a value in the range of 0.1 to 1 OMEGA.

The second and third resistors R2 and R3 have the same value for the positions of the light emitting regions E1 to E2n but the first resistor R1 has a different value depending on the positions of the light emitting regions E1 to E2n The organic light emitting diode D is supplied with a different power depending on the positions of the light emitting regions E1 to E2n by the first resistor R1.

That is, the resistance of the n-th and (n + 1) -th emission regions En and En + 1 to the organic light emitting diode D is the resistance of the first resistor R1, the n- 1 and En + 2) to the organic light emitting diode D becomes twice as much as the first resistor R1 (2R1), and the first and second n-emission regions (N1) of the first resistor R1 to the organic light emitting diodes D of the first and second transistors E1 and E2n.

Therefore, the power supplied to the organic light emitting diodes D of the (n-1) th and (n + 2) th light emitting regions En-1 and En + And the lowest voltage power is supplied to the organic light emitting diodes D of the first and second n light emitting regions E1 and E2n.

As a result, a power source having a lower voltage is supplied from the light emitting region in the central portion of the substrate 220 to the light emitting region in the upper and lower ends of the substrate 220. This is a lighting device having a maximum value at the central portion and gradually decreasing toward the edge 210).

For example, the voltage of the power source can be reduced by about 0.02 V while passing through the connection wiring corresponding to one light emitting region.

Therefore, when the voltage of the power supplied from the first and second power supply units 230a and 230b is A (V), the organic light emitting diodes of the nth and (n + 1) The voltage supplied to the organic light emitting diode D of the (n-1) th and (n + 2) th light emitting regions En- The voltage supplied to the organic light emitting diodes D of the first and second n emissive regions E1 and E2n is A ± 0.02 (2n) (V) Accordingly, the brightness gradually decreases from the central portion of the substrate 120 toward the edge portion.

Here, the voltage A (V) of the supplied power source is a positive or negative value, and the base low-voltage pad 226 can be grounded.

The first and second electrodes of the organic light emitting diode D become the anode and the cathode respectively and the voltage decreases toward the edge so that the first and second n light emitting regions E1 The voltage supplied to the organic light emitting diode D of the organic light emitting diode D is A-0.02 (2n) (V), and when A (V) is negative, the first and second electrodes of the organic light emitting diode D are The voltage supplied to the organic light emitting diodes D of the first and second n emissive regions E1 and E2n increases as the voltage increases to the edge and the voltage increases to A + 0.02 (2n) (V).

Accordingly, in the case of the illumination device 210 according to the second embodiment as well as the illumination device 110 according to the first embodiment, the highest luminance value at the central portion of the substrate 220 is gradually reduced toward the edge portion of the substrate 220 Has a low luminance value, and as a result, the visibility or visibility is improved.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

1 is an equivalent circuit diagram of a lighting device including a conventional organic light emitting diode array.

2 is a view showing a luminance distribution of a lighting apparatus including a conventional organic light emitting diode array.

3 is an equivalent circuit diagram of a lighting apparatus including an organic light emitting diode array according to a first embodiment of the present invention.

4 is a diagram showing luminance distribution of a lighting apparatus including an organic light emitting diode array according to a first embodiment of the present invention.

5 is a plan view of a substrate on which an organic light emitting diode array according to a first embodiment of the present invention is formed.

6 is a cross-sectional view taken along the section line VI-VI of Fig. 5;

FIG. 7 is an equivalent circuit diagram of a lighting apparatus according to a second embodiment of the present invention, including a light emitting diode array. FIG.

Claims (10)

  1. A power supply unit for supplying power;
    A substrate connected to the power supply unit and having a plurality of emission regions defined therein;
    A plurality of power input lines for transmitting the power from the power supply unit to the substrate;
    A plurality of power input pads formed at one edge of the substrate and connected to the plurality of power input lines and the plurality of power lines, respectively;
    A plurality of power supply lines each extending from the one edge portion of the substrate to a central portion of the substrate;
    A plurality of first connection wirings and a plurality of second connection wirings respectively formed at upper and lower halves of the substrate and connected to the plurality of power supply wirings at the central portion of the substrate to receive the power supply;
    A plurality of organic light emitting diodes (OLEDs) connected to the plurality of first connection lines and the plurality of second connection lines, respectively, the plurality of OLEDs being formed in the plurality of emission regions;
    And a plurality of base low voltage pads formed on the one edge of the substrate and connected to the plurality of light emitting diodes,
    ≪ / RTI >
  2. The method according to claim 1,
    Wherein a brightness gradually decreases from the central portion of the substrate to the one edge portion of the substrate.
  3. delete
  4. delete
  5. The method according to claim 1,
    Each of the plurality of organic light emitting diodes includes:
    An auxiliary electrode formed on the substrate in a rectangular shape and connected to one of the plurality of first connection wiring lines and the plurality of second connection wiring lines;
    A first electrode formed on the auxiliary electrode in a rectangular plate shape;
    An insulating layer formed on the first electrode and having an opening exposing the first electrode;
    A light emitting material layer formed on the insulating layer and contacting the first electrode through the opening;
    A second electrode formed on the light emitting material layer and connected to the base low voltage pad,
    ≪ / RTI >
  6. First and second power supply units respectively supplying power;
    A substrate connected to the first and second power supply units and defining a plurality of light emitting regions;
    A plurality of first power input lines for transmitting the power from the first power supply unit to the substrate;
    A plurality of second power input lines for transmitting the power from the second power supply to the substrate;
    A plurality of first power input pads formed on one edge of the substrate and connected to the plurality of first power input lines and the plurality of first power lines;
    A plurality of second power input pads formed on the other edge of the substrate and connected to the plurality of second power input lines and the plurality of second power lines;
    A plurality of first power supply lines each extending from the one edge portion of the substrate to a central portion of the substrate;
    A plurality of second power supply lines each extending from the rim portion of the substrate to the central portion of the substrate;
    A plurality of first connection wirings formed at an upper half of the substrate and connected to the plurality of first power supply wirings at the central portion of the substrate to receive the power supply;
    A plurality of second connection wirings formed at a lower half of the substrate and connected to the plurality of second power supply wirings at the central portion of the substrate to receive the power supply;
    A plurality of organic light emitting diodes (OLEDs) connected to the plurality of first connection lines and the plurality of second connection lines, respectively, the plurality of OLEDs being formed in the plurality of emission regions;
    And a plurality of base low voltage pads formed on the one edge of the substrate and connected to the plurality of light emitting diodes,
    ≪ / RTI >
  7. delete
  8. A plurality of power supply wirings extending from one edge of the substrate to a central portion of the substrate on which the plurality of light emitting regions are defined; and a plurality of power supply wirings arranged on the upper and lower halves of the substrate, A plurality of first connection wirings, a plurality of second connection wirings, and a plurality of power input pads connected to the plurality of power supply wirings, respectively, at one edge portion of the substrate, the plurality of first connection wirings being connected to the power supply wirings;
    Forming a plurality of organic light emitting diodes connected to the plurality of first connection wiring lines and the plurality of second connection wiring lines in the plurality of light emission areas;
    Forming a plurality of base low voltage pads formed on the one edge of the substrate and connected to the plurality of light emitting diodes, respectively;
    ≪ / RTI >
  9. 9. The method of claim 8,
    Wherein forming the plurality of organic light emitting diodes comprises:
    Forming a rectangular-shaped auxiliary electrode connected to one of the plurality of first connection wiring lines and the plurality of second connection wiring lines on the substrate;
    Forming a first electrode having a rectangular plate shape on the auxiliary electrode;
    Forming an insulating layer on the first electrode, the insulating layer having an opening exposing the first electrode;
    Forming a light emitting material layer on the insulating layer, the light emitting material layer contacting the first electrode through the opening;
    Forming a second electrode connected to the base low voltage pad on the light emitting material layer
    And a light emitting device.
  10. 10. The method of claim 9,
    Wherein the plurality of power supply lines, the plurality of first connection lines, the plurality of second connection lines, and the auxiliary electrode are formed through the same process.
KR1020090077191A 2009-08-20 2009-08-20 Lighting Apparatus Including Organic Light Emitting Diode Array And Method Of Fabricating The Same KR101591335B1 (en)

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KR20150118257A (en) 2014-04-11 2015-10-22 삼성디스플레이 주식회사 Organic Light Emitting Display apparatus, and method for driving the display apparatus Apparatus for manufacturing display apparatus and method of manufacturing display apparatus
KR20160036132A (en) 2014-09-24 2016-04-04 삼성디스플레이 주식회사 Display device compensating variation of power supply voltage
KR20160087987A (en) 2015-01-14 2016-07-25 삼성디스플레이 주식회사 Organic light emitting diode display

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200355506Y1 (en) 2004-03-17 2004-07-07 손상훈 A sign luminous-module
JP2006189804A (en) 2004-12-06 2006-07-20 Semiconductor Energy Lab Co Ltd Light-emitting device and electronic apparatus using the light-emitting device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200355506Y1 (en) 2004-03-17 2004-07-07 손상훈 A sign luminous-module
JP2006189804A (en) 2004-12-06 2006-07-20 Semiconductor Energy Lab Co Ltd Light-emitting device and electronic apparatus using the light-emitting device

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