Source: https://patents.google.com/patent/KR20140104739A/en
Timestamp: 2020-01-28 05:59:47
Document Index: 23463120

Matched Legal Cases: ['art 311', 'art 312', 'art 312', 'art 200', 'art 312', 'art 200', 'art 312', 'art 350', 'art 312', 'art 200', 'art 312', 'art 200', 'art 311', 'art 312', 'art 340', 'art 311', 'art 312', 'art\n312']

KR20140104739A - Organic Light Emitting Display - Google Patents
KR20140104739A
KR20140104739A KR1020130018613A KR20130018613A KR20140104739A KR 20140104739 A KR20140104739 A KR 20140104739A KR 1020130018613 A KR1020130018613 A KR 1020130018613A KR 20130018613 A KR20130018613 A KR 20130018613A KR 20140104739 A KR20140104739 A KR 20140104739A
KR1020130018613A
KR102057286B1 (en
2013-02-21 Priority to KR1020130018613A priority Critical patent/KR102057286B1/en
2014-08-29 Publication of KR20140104739A publication Critical patent/KR20140104739A/en
2019-12-19 Application granted granted Critical
2019-12-19 Publication of KR102057286B1 publication Critical patent/KR102057286B1/en
A display panel includes a scan line, a data line, a first power line, and a plurality of pixels. A power supply unit located outside the display panel and supplying a first power to the display panel through a connection member; And a first connection line and a second connection line electrically connected to the first power line of the display panel, a first connection line connecting the first power line supplied from the power supply unit to the first connection unit and the second connection unit, A second connection line, and a feedback line for transmitting a voltage of the second connection unit to the power supply unit; And an organic light emitting display device. According to the present invention, it is possible to provide an organic light emitting display device capable of accurately controlling the voltage of the output power source and preventing the luminance of the display panel from being lowered.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting display, and more particularly, to an organic light emitting display capable of accurately controlling a voltage of an output power source and preventing luminance of a display panel from being lowered.
2. Description of the Related Art In recent years, various display devices capable of reducing weight and volume, which are disadvantages of cathode ray tubes (CRTs), have been developed. Examples of the display device include a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic light emitting display OLED).
The organic light emitting display device displays an image using an organic light emitting diode that generates light by recombination of electrons and holes. This is advantageous in that it has a fast response speed and is driven with low power consumption.
The organic light emitting display includes a display panel having a plurality of pixels to display an image, a power source for supplying power to the display panel through a flexible printed circuit board (FPCB) And a supply section.
The power supply unit converts external power to generate power sources necessary for driving the display panel. At this time, the power supply unit receives the power output to the output terminal to regulate the voltage of the output power supply.
However, since a voltage drop occurs due to a flexible circuit board existing between the display panel and the power supply unit, the voltage of the power supply input to the display panel becomes lower than the output voltage of the power supply unit.
Therefore, the conventional power supply unit receives the voltage higher than the power supply voltage used in the actual display panel, and therefore, the power supply unit outputs a power supply voltage lower than the power supply voltage required by the actual display panel. This causes a problem that the luminance of the display panel is lower than the target luminance.
SUMMARY OF THE INVENTION An object of the present invention is to provide an organic light emitting display capable of precisely controlling the voltage of an output power source and preventing luminance of a display panel from being lowered.
According to an aspect of the present invention, there is provided a display panel including a scan line, a data line, a first power line, and a plurality of pixels, A first connection unit and a second connection unit electrically connected to the first power source line of the display panel, and a second connection unit electrically connected to the first connection unit and the second connection unit, And a connection member including a first connection line and a second connection line for transmitting the voltage to the second connection unit and a feedback line for transmitting the voltage of the second connection unit to the power supply unit.
The power supply unit adjusts an output voltage of the first power supply according to a voltage transmitted from the feedback line.
The first connection line electrically connects the output terminal of the power supply unit to which the first power is output and the first connection unit, and the second connection line is connected to the output terminal of the power supply unit And the second connection portion are electrically connected to each other.
In addition, the feedback line electrically connects the feedback terminal of the power supply unit and the second connection unit.
In addition, the connecting member is attached to one side region of the display panel.
The display panel may further include a first power pad and a second power pad which are located in the one side area and are respectively connected to the first connection part and the second connection part.
The first power source line may be connected to the first power source pad and the second power source pad.
The second connecting line is longer than the first connecting line.
The power supply unit may be a DC-DC converter.
Further, the connecting member is a printed circuit board.
Further, the connecting member is a flexible printed circuit board.
The liquid crystal display further includes a scan driver for supplying a scan signal to the pixel through the scan line, and a data driver for supplying a data signal to the pixel through the data line.
As described above, according to the present invention, it is possible to provide an organic light emitting display capable of accurately controlling the voltage of the output power source and preventing the luminance of the display panel from being lowered.
1 and 2 are views showing an organic light emitting display according to an embodiment of the present invention.
3 is a view showing a display panel according to an embodiment of the present invention.
4 is a diagram showing an embodiment of the pixel shown in FIG.
5 is a view illustrating a power supply unit according to an embodiment of the present invention.
Hereinafter, an organic light emitting display according to an embodiment of the present invention will be described with reference to embodiments of the present invention and drawings for explaining the present invention.
In particular, FIG. 1 illustrates a state in which the connecting member 300 is separated from the display panel 100, and FIG. 2 illustrates a state in which the connecting member 300 is attached to the display panel 100.
Referring to FIGS. 1 and 2, an organic light emitting display 1 according to an embodiment of the present invention includes a display panel 100, a power supply unit 200, and a connection member 300.
The display panel 100 includes a plurality of pixels 140, and can display a predetermined image.
The display panel 100 may include a first power line 120 for supplying the first power ELVDD to the pixel 140. [
The power supply unit 200 may be located outside the display panel 100 and may serve to supply the first power ELVDD to the display panel 100 through the connection member 300.
The connection member 300 may serve to transmit the first power ELVDD output from the power supply unit 200 to the display panel 100.
In addition, the connection member 300 may serve to feed back the first power ELVDD having a voltage drop to the power supply unit 200.
The connection member 300 may include a first connection unit 311, a second connection unit 312, a first connection line 321, a second connection line 322, and a feedback line 330.
The first connection part 311 and the second connection part 312 may be electrically connected to the first power line 120 of the display panel 100.
The first connection line 321 and the second connection line 322 can transmit the first power ELVDD supplied from the power supply unit 200 to the first connection unit 311 and the second connection unit 312, respectively.
The first connection line 321 may electrically connect the output terminal OUT of the power supply unit 200 to which the first power ELVDD is output and the first connection unit 311 and the second connection unit 312 may electrically connect the output terminal OUT of the power supply unit 200, May electrically connect the output terminal OUT of the power supply unit 200 from which the first power ELVDD is output to the second connection unit 312. [
The first power source ELVDD output to the output terminal OUT of the power supply unit 200 is connected to the first connection unit 311 and the second connection unit 312 through the first connection line 321 and the second connection line 322. [ ). &Lt; / RTI &gt;
The first connection line 321 and the second connection line 322 may be electrically connected to the power supply unit 200 through the third connection unit 340 included in the connection member 300.
That is, the first connection line 321 is located between the first connection unit 311 and the third connection unit 340, and the second connection line 322 is located between the second connection unit 312 and the third connection unit 340 .
One end of the first connecting line 321 and the other end of the second connecting line 322 are connected to the third connecting portion 340, So that one wiring can be formed.
2, the first connection line 321 and the second connection line 322 are electrically connected to the power supply unit 200 through the third connection unit 340. However, the first connection line 321 and the second connection line 322 may be electrically connected to each other, The connection line 322 may be electrically connected to the power supply unit 200 through a separate third connection unit.
The feedback line 330 may transmit the voltage Vfb of the second connection part 312 to the power supply part 200. More specifically, the feedback line 330 may transmit the voltage Vfb of the second connection part 312 to the feedback terminal FB of the power supply part 200.
To this end, the feedback line 330 may electrically connect the feedback terminal FB of the power supply unit 200 and the second connection unit 312.
The feedback line 330 may be electrically connected to the power supply unit 200 through a fourth connection unit 350 included in the connection member 300.
That is, the feedback line 330 may be positioned between the second connection part 312 and the fourth connection part 350.
The power supply unit 200 may adjust the output voltage of the first power ELVDD in response to the voltage Vfb transmitted by the feedback line 330. [
At this time, the voltage Vfb of the second connection part 312 may be fed back to the feedback terminal FB of the power supply part 200 through the feedback line 330.
The voltage Vfb of the second connection part 312 becomes lower than the voltage of the first power ELVDD output from the output terminal OUT of the power supply part 200 due to the resistance of the second connection line 322 or the like.
The present invention can feed back the voltage Vfb reflecting the amount of voltage drop by the connection member 300 to the power supply unit 200 through the feedback line 330 as described above, It is possible to precisely control the brightness of the display panel 100 and prevent the brightness of the display panel 100 from decreasing.
The connection member 300 may be implemented as a printed circuit board or a flexible printed circuit board.
The connection member 300 may be attached to one side region 110 of the display panel 100 for connection with the first power source line 120 existing in the display panel 100. [
The display panel 100 further includes a first power pad 111 and a second power pad 112 which are located in the first area 110 and are respectively connected to the first connection part 311 and the second connection part 312, .
For example, when the connection member 300 is attached to one side region 110 of the display panel 100, the first power source pad 111 is in contact with the first connection portion 311, and the second power source pad 112 May be in contact with the second connection portion 312.
The first power source line 120 is connected to the first power source pad 111 and the second power source pad 112 so that the first power source line 120 is connected to the first power source pad 111 and the second power source pad 112, 1 power source (ELVDD) to each pixel 140.
The power supply unit 200 may be a DC-DC converter that converts an input power supply Vin (see FIG. 5) supplied from the outside to a first power supply ELVDD.
In this case, the power supply unit 200 may be connected to the connection member 300 through the printed circuit board (not shown) while being mounted on a separate printed circuit board (not shown).
A printed circuit board (not shown) on which the power supply unit 200 is mounted may be connected to the third connection unit 340 and the fourth connection unit 350 of the connection member 300.
Also, the power supply unit 200 may be directly mounted on the connecting member 300. [ In this case, the power supply unit 200 may be directly connected to the third connection unit 340 and the fourth connection unit 350 of the connection member 300.
The output terminal OUT of the power supply unit 200 is connected to the third connection part 340, the first connection line 321, the second connection line 322, the first connection part 311 and the second connection part 312, respectively.
The feedback terminal FB of the power supply unit 200 may be electrically connected to the fourth connection unit 350, the feedback line 330, and the second connection unit 312.
When the length of the second connection line 322 is longer than the length of the first connection line 321, the voltage of the second connection line 312 is lower than the voltage of the first connection line 311 do.
The feedback line 330 is connected to the second connection unit 311 having a voltage lower than that of the first connection unit 311 so as to feed back a voltage of the same magnitude as that of the power supplied to the actual display panel 100 to the power supply unit 200. [ 312).
3, a display panel 100 according to an exemplary embodiment of the present invention includes scan lines S1 to Sn, data lines D1 to Dm, a first power source line 120, and a plurality of Pixel 140 may be included.
The organic light emitting display device 1 according to the embodiment of the present invention includes a scan driver 170 for supplying a scan signal to each pixel 140 through scan lines S1 to Sn, And a timing controller 190 for controlling the data driver 180 and the scan driver 170 and the data driver 180 to supply the data signals to the pixels 140 through the data driver 180.
The power supply unit 200 may be electrically connected to the first power supply pad 111 and the second power supply pad 112 in the display panel 100 through the connection member 300. [
The first power source line 120 is connected to the first power source pad 111 and the second power source pad 112 located at the one side region 110 of the display panel 100, The power supply ELVDD can be transmitted.
Each of the pixels 140 supplied with the first power ELVDD and the second power ELVSS is supplied with the data signal ELVDD by the current flowing from the first power ELVDD to the second power ELVSS via the organic light emitting diode, As shown in FIG.
The scan driver 170 generates a scan signal under the control of the timing controller 190 and supplies the generated scan signal to the scan lines S1 to Sn.
The data driver 180 generates a data signal under the control of the timing controller 190 and supplies the generated data signal to the data lines D1 to Dm.
When the scan signals are sequentially supplied to the scan lines S1 to Sn, the pixels 140 are sequentially selected line by line, and the selected pixels 140 receive the data signals transmitted from the data lines D1 to Dm .
The scan driver 170, the data driver 180, and the timing controller 190 may be located inside the display panel 100. For example, each of the drivers 170, 180, and 190 may be directly mounted on the display panel 100.
The scan driver 170, the data driver 180 and the timing controller 190 are connected to the display panel 100 through a separate connection member (for example, PCB, FPCB, etc.) Can be installed.
4 is a diagram showing an embodiment of the pixel shown in FIG. In particular, FIG. 4 shows pixels connected to the n th scanning line Sn and the m th data line Dm for convenience of explanation.
4, each pixel 140 includes an organic light emitting diode OLED, a pixel circuit 142 connected to the data line Dm and the scan line Sn to control the organic light emitting diode OLED, .
The anode electrode of the organic light emitting diode (OLED) is connected to the pixel circuit 142, and the cathode electrode is connected to the second power source ELVSS.
The organic light emitting diode OLED can generate light of a predetermined luminance corresponding to the current supplied from the pixel circuit 142.
The pixel circuit 142 can control the amount of current supplied to the organic light emitting diode OLED in response to the data signal supplied to the data line Dm when the scan signal is supplied to the scan line Sn.
The pixel circuit 142 includes a second transistor T2 connected between the first power source ELVDD and the organic light emitting diode OLED and a second transistor T2 connected between the second transistor T2 and the data line Dm and the scan line Sn And a storage capacitor Cst connected between a gate electrode of the second transistor T2 and the first electrode T2.
The gate electrode of the first transistor T1 is connected to the scan line Sn, and the first electrode thereof is connected to the data line Dm.
The second electrode of the first transistor T1 is connected to one terminal of the storage capacitor Cst.
Here, the first electrode is set to one of the source electrode and the drain electrode, and the second electrode is set to be different from the first electrode. For example, if the first electrode is set as the source electrode, the second electrode is set as the drain electrode.
The first transistor T1 connected to the scan line Sn and the data line Dm is turned on when a scan signal is supplied from the scan line Sn to apply a data signal supplied from the data line Dm to the storage capacitor Cst ). At this time, the storage capacitor Cst charges the voltage corresponding to the data signal.
The gate electrode of the second transistor T2 is connected to one terminal of the storage capacitor Cst and the first electrode is connected to the other terminal of the storage capacitor Cst and the first power source ELVDD. The second electrode of the second transistor T2 is connected to the anode electrode of the organic light emitting diode OLED.
The second transistor T2 controls the amount of current flowing from the first power source ELVDD to the second power source ELVSS via the organic light emitting diode OLED in response to a voltage value stored in the storage capacitor Cst. At this time, the organic light emitting diode OLED generates light corresponding to the amount of current supplied from the second transistor T2.
Since the pixel structure of FIG. 4 described above is only an embodiment of the present invention, the pixel 140 of the present invention is not limited to the pixel structure. In practice, the pixel circuit 142 has a circuit structure capable of supplying current to the organic light emitting diode (OLED), and can be selected from any of various structures currently known.
The second power ELVSS supplied to each pixel 140 together with the first power ELVDD may be generated by a separate power supply unit and may be generated in the same manner as the first power ELVDD, (140).
At this time, the first power ELVDD may be set to a positive polarity voltage and the second power ELVSS may be set to a negative polarity voltage.
Referring to FIG. 5, the power supply unit 200 according to an exemplary embodiment of the present invention may be implemented as a boost type DC-DC converter.
The power supply unit 200 according to an exemplary embodiment of the present invention generates the first power ELVDD by receiving the input power Vin supplied to the input IN and supplies the first power ELVDD to the output terminal OUT ).
Also, the power supply unit 200 may receive the voltage Vfb transmitted from the feedback line 330 to the feedback terminal FB.
For example, the power supply unit 200 may include an inductor L1, a first transistor M1, a second transistor M2, a switching control unit 210, and a voltage distribution unit 220.
The inductor L1 is connected between the input IN and the first node N1.
The first transistor M1 is connected between the first node N1 and the ground power source.
The second transistor M2 is connected between the first node N1 and the output terminal OUT.
The switching controller 210 may control the first transistor M1 and the second transistor M2. The switching control unit 210 controls the ON and OFF operations of the first transistor M1 and the second transistor M2 to convert the input power Vin into a first power ELVDD having a desired voltage level .
The voltage divider 220 divides the voltage Vfb input from the feedback terminal FB and supplies the divided voltage to the switching controller 210.
For example, the voltage divider 220 may be composed of a plurality of resistors (for example, R1 and R2) connected in series.
The switching controller 210 receiving the voltage divided by the voltage divider 220 adjusts the duty ratios of the first transistor M1 and the second transistor M2 in response to the divided voltage, 1 power source (ELVDD).
At this time, the first transistor M1 and the second transistor M2 may be alternately turned on and thus may be formed in different conductive types. For example, when the first transistor M1 is formed in a P-type, the second transistor M2 may be formed in an N-type.
Since the structure of FIG. 5 described above is only an embodiment of the present invention, the power supply unit 200 of the present invention is not limited to the above-described circuit structure. In fact, the power supply 200 may be modified into various circuit structures capable of generating the first power supply ELVDD.
1: organic electroluminescence display device
110: one side area
111: first power pad
112: second power pad
120: first power line
300: connecting member
311: first connection part
312: second connection portion
321: first connection line
322: second connecting line
A display panel including a scan line, a data line, a first power line, and a plurality of pixels;
A power supply unit located outside the display panel and supplying a first power to the display panel through a connection member; And
A first connection unit and a second connection unit electrically connected to the first power line of the display panel, a first connection line for transmitting the first power supplied from the power supply unit to the first connection unit and the second connection unit, 2 connection line, and a feedback line for transmitting the voltage of the second connection unit to the power supply unit; And an organic electroluminescent display device.
And adjusts an output voltage of the first power supply according to a voltage transmitted from the feedback line.
Wherein the first connection line electrically connects the output terminal of the power supply unit to which the first power is output and the first connection unit,
Wherein the second connection line electrically connects the output terminal of the power supply unit from which the first power is output to the second connection unit.
And electrically connects the feedback terminal of the power supply unit and the second connection unit.
Wherein the display panel is attached to one side of the display panel.
And a first power pad and a second power pad, which are located in the one side area and are respectively connected to the first connection part and the second connection part.
The plasma display apparatus of claim 6,
Wherein the first power supply pad and the second power supply pad are connected to the first power supply pad and the second power supply pad.
And the length of the first connection line is longer than the length of the first connection line.
Wherein the organic light emitting display device is a printed circuit board.
Wherein the flexible printed circuit board is a flexible printed circuit board.
A scan driver for supplying a scan signal to the pixel through the scan line; And
A data driver for supplying a data signal to the pixel through the data line; The organic light emitting display device further comprising:
KR1020130018613A 2013-02-21 2013-02-21 Organic Light Emitting Display KR102057286B1 (en)
KR1020130018613A KR102057286B1 (en) 2013-02-21 2013-02-21 Organic Light Emitting Display
US13/923,894 US9293519B2 (en) 2013-02-21 2013-06-21 Organic light emitting display
TW102132044A TWI604425B (en) 2013-02-21 2013-09-05 Organic light emitting display
CN201310472615.XA CN104008722B (en) 2013-02-21 2013-10-11 Organic light emitting display
KR20140104739A true KR20140104739A (en) 2014-08-29
KR102057286B1 KR102057286B1 (en) 2019-12-19
ID=51350694
US (1) US9293519B2 (en)
KR (1) KR102057286B1 (en)
CN (1) CN104008722B (en)
TW (1) TWI604425B (en)
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2013-02-21 KR KR1020130018613A patent/KR102057286B1/en active IP Right Grant
2013-06-21 US US13/923,894 patent/US9293519B2/en active Active
2013-09-05 TW TW102132044A patent/TWI604425B/en active
2013-10-11 CN CN201310472615.XA patent/CN104008722B/en active IP Right Grant
TWI604425B (en) 2017-11-01
KR102057286B1 (en) 2019-12-19
US9293519B2 (en) 2016-03-22
TW201434024A (en) 2014-09-01
CN104008722A (en) 2014-08-27
CN104008722B (en) 2018-07-10
US20140232275A1 (en) 2014-08-21
CN1758308A (en) 2006-04-12 Pixel circuit and light emitting display comprising the same
2019-12-12 GRNT Written decision to grant