KR20080113528A - Organic light emitting device - Google Patents

Organic light emitting device Download PDF

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Publication number
KR20080113528A
KR20080113528A KR1020070062104A KR20070062104A KR20080113528A KR 20080113528 A KR20080113528 A KR 20080113528A KR 1020070062104 A KR1020070062104 A KR 1020070062104A KR 20070062104 A KR20070062104 A KR 20070062104A KR 20080113528 A KR20080113528 A KR 20080113528A
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South Korea
Prior art keywords
light emitting
electrode
data signal
power supply
subfield
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KR1020070062104A
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Korean (ko)
Inventor
이현재
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020070062104A priority Critical patent/KR20080113528A/en
Publication of KR20080113528A publication Critical patent/KR20080113528A/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present invention relates to an organic light emitting display device. In an organic light emitting display device according to an embodiment of the present invention, an organic light emitting display device displaying an image by dividing one frame into a plurality of subfields, wherein a first power supply voltage is applied and data is applied in response to a scan signal. A pixel driver for outputting a driving current corresponding to the signal, a second light emitting with light corresponding to the driving current output from the pixel driver, and a first electrode connected to the pixel driver and a second power supply voltage lower than the first power supply voltage; A light emitting device including an electrode, connected to a second electrode, connected to a first switching device and a second electrode for controlling light emission of the light emitting device, and applying a reverse bias voltage higher than the first power supply voltage to the second electrode; And a second switching element.

Description

Organic electroluminescent display device

1 is a diagram for describing an organic light emitting display device according to an exemplary embodiment of the present invention.

2 is an equivalent circuit diagram of a pixel of an organic light emitting display according to an exemplary embodiment of the present invention.

3 is a diagram for describing a method of implementing image grayscale of an organic light emitting display device according to an exemplary embodiment of the present invention.

4 is an equivalent circuit diagram of a pixel of an organic light emitting display according to another exemplary embodiment of the present invention.

FIG. 5 is a diagram for describing a method of implementing image grayscale of an organic light emitting display device according to another exemplary embodiment.

(Explanation of symbols for the main parts of the drawing)

110: pixel circuit unit 120: pixel

130: power supply unit 140: timing control unit

150: drive unit

The present invention relates to an organic light emitting display device.

Among the flat panel display devices, the EL display device is a self-luminous display device, which does not require a backlight, which enables light weight and thinness, simplifies the process, enables low temperature production, and a response speed of 1 ms or less. As a result, it has a high response speed and exhibits characteristics such as low power consumption, wide viewing angle, and high contrast.

In particular, the organic light emitting display device includes a light emitting layer including an organic material between an anode and a cathode, and holes supplied from the anode and electrons received from the cathode combine in the organic light emitting layer to form an exciton, a hole-electron pair. The excitons emit light by the energy generated when they return to the ground state.

In the organic light emitting display, since forward driving voltage is always applied to the light emitting device, space charges are stored in the light emitting device. Due to the accumulation of space charges, there is a problem that the life of the device is shortened.

Accordingly, an object of the present invention is to provide an organic light emitting display device that can extend the life of the device.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In the organic light emitting display device according to an embodiment of the present invention to display an image by dividing one frame into a plurality of subfields, a first power supply voltage is applied And a pixel driver for outputting a driving current corresponding to the data signal in response to the scan signal, a first electrode connected to the pixel driver, and a second power lower than the first power supply voltage to emit light with light corresponding to the driving current output from the pixel driver. A light emitting device including a second electrode to which a power supply voltage is applied; a light emitting device connected to a second electrode; a first switching device controlling a light emission of the light emitting device; and a second electrode; And a second switching element for applying a high reverse bias voltage.

The second switching element may be turned on when the first switching element is turned off.

The pixel driver includes a first transistor that transmits the data signal in response to the scan signal, a capacitor that stores the data signal, and a second transistor that generates a driving current corresponding to the data signal.

The pixel driver may include a first transistor for transmitting the data signal in response to the scan signal, a capacitor for storing the data signal, a second transistor for generating a driving current corresponding to the data signal, and the data signal stored in the capacitor. And a third transistor for transmitting the erase signal to erase the signal.

The second switching device may be turned on in at least one subfield of the plurality of subfields.

The second switching element may be turned on in the subfield having the highest gray scale weight among the plurality of subfields.

The second switching element may be turned on in the last subfield of the one frame.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, a display filter, a manufacturing method thereof, a display device, and a manufacturing method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram for describing an organic light emitting display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1, an organic light emitting display device according to an exemplary embodiment of the present invention includes a pixel circuit unit 110, a power supply unit 130, and a timing controller 140 including a plurality of red, green, and blue pixels 120. ) And the driving unit 150.

The pixel circuit unit 110 is positioned in an area intersected by the scan line and the data line and includes a plurality of red, green, and blue pixels 120 for displaying an image image.

The power supply unit 130 supplies the first power voltage V DD , the second power voltage V SS , and the reverse bias voltage Vbias to the red, green, and blue pixels 120.

The timing controller 140 is configured such that the first power supply voltage V DD , the second power supply voltage V SS , and the inverse of the power supply unit 130 are based on the vertical synchronization signal Vsync and the horizontal synchronization signal Hsync supplied from the outside. A control signal for supplying a bias voltage Vbias and a predetermined control signal for driving the driver 150 are generated.

The driver 150 sequentially supplies the scan signal Vs to the pixel circuit unit 110 in response to the control signal generated from the timing controller 140. In addition, the data signal Vdata, the erase signal V E , the reverse bias signal V B1 , and the emission control signal V B2 are transmitted to the pixel circuit unit 110 in response to the control signal generated from the timing controller 140. Supply. Accordingly, the red, green, and blue pixels 120 of the pixel circuit unit 110 emit light.

2 is an equivalent circuit diagram of a pixel of an organic light emitting display according to an exemplary embodiment of the present invention.

Referring to FIG. 2, a pixel 120 of an organic light emitting display device according to an embodiment of the present invention may include a pixel driver 210, a light emitting device OLED, and a first switching device S1 that controls light emission. A second switching device S2 for applying a bias voltage Vbias is included.

The pixel driver 210 may include a first transistor M1 for transmitting the data signal Vdata from the scan line Sn and a capacitor Cst and a capacitor Cst for storing the data signal Vdata. The second transistor M2 may generate a driving current corresponding to a difference between the data signal Vdata and the first power voltage V DD stored in FIG.

In detail, the first transistor M1 has a source connected to the data line Dm and a gate connected to the scan line Sn. A source of the second transistor M2 is connected to the source of the first power supply voltage V DD , a gate of the second transistor M2 is connected to a drain of the first transistor M1, and a capacitor Cst is connected between the gate and the source.

The light emitting device OLED emits light corresponding to the driving current output from the pixel driver 210 described above. The first electrode of the light emitting device OLED may be an anode electrode, and the second electrode may be a cathode electrode. Here, the first electrode is connected to the drain of the second transistor M2.

The first switching device S1 may be a transistor, the source of the first switching device S1 is connected to the second electrode of the light emitting device OLED, and the drain is connected to the second power supply voltage V SS source. . The first switching device S1 is turned on in response to the light emission control signal V B2 so that the driving current output from the pixel driver 210 flows to the light emitting device OLED.

Here, the second power supply voltage V SS may be lower than the first power supply voltage V DD , and a negative voltage or a ground voltage may be used.

The second switching device S2 may be a transistor, and a drain of the second switching device S2 is connected to a power supply line Vbias applying the reverse bias voltage Vbias, and a source thereof is formed of the light emitting device OLED. It is connected to two electrodes. The second switching device S2 is turned on in response to the reverse bias signal V B1 to apply a reverse bias voltage Vbias to the second electrode of the light emitting device OLED, thereby reverse biasing the light emitting device OLED. Allow current to flow Accordingly, the space charge stored in the light emitting device OLED is discharged, and the lifespan of the light emitting device OLED can be increased.

Hereinafter, a method of driving an organic light emitting display device according to an embodiment of the present invention will be described in detail.

First, while the low level scan signal Vs is applied to the scan line Sn, the first transistor M1 is turned on so that the data signal Vdata connected from the data line Dm is connected to the gate of the second transistor M2. That is, one end of the capacitor Cst is applied. Accordingly, the capacitor Cst has a voltage corresponding to the difference between the first power supply voltage V DD and the data signal Vdata, that is, the voltage V GS charged between the gate and the source of the second transistor M2. The second transistor M2 is charged, and the driving current I OLED corresponding to the charged voltage V GS flows to the drain.

In addition, when the light emission control signal V B2 becomes low during the above period, the first switching device S1 is turned on so that the driving current I OLED flows through the light emitting device OLED, thereby driving the driving current I OLED . In response to this, the light emitting element OLED emits light.

Next, when the light emission control signal V B2 becomes high level and the first switching device S1 is turned off, and the reverse bias signal V B1 becomes low level and the second switching device S2 is turned on, The reverse bias voltage Vbias higher than the first power supply voltage V DD is applied to the second electrode of the light emitting device OLED.

Accordingly, since a voltage having a higher level than that of the anode electrode is applied to the cathode of the light emitting device OLED, a reverse bias current flows through the light emitting device OLED. As a result, the space charge stored between the light emitting elements OLED may be discharged to increase the lifespan of the light emitting elements OLED.

3 is a diagram for describing a method of implementing image gray scale of an organic light emitting display device according to an exemplary embodiment of the present invention.

First, referring to FIG. 3A, in an organic electroluminescent display according to an exemplary embodiment, a frame for implementing gray levels of an image is divided into several subfields having different emission times, and each subfield Is divided into an address section for selecting a subpixel to emit light again, a light emitting section for implementing gray scale according to the light emission time, and a bias section for applying a reverse bias voltage Vbias.

For example, when displaying an image with 64 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into six subfields SF1 to SF6, and six subfields SF1 to SF6) are each divided into an address section, a light emitting section, and a bias section.

That is, the light emitting device OLED selects a subpixel to emit light by applying a scan signal Vs to an address section in one subfield, and emits light by applying a data signal Vdata to the light emitting section.

Subsequently, in the organic light emitting diode display according to an exemplary embodiment of the present invention, a bias period is formed at the end of each subfield so that light emission is stopped and a reverse bias voltage Vbias is applied to the cathode electrode of the light emitting device OLED for a predetermined time. Is applied to discharge the space charge stored in the light emitting device (OLED).

Here, the address period and the bias period of each subfield may be the same for each subfield.

The light emission section is a period for determining the gray scale weight in each subfield. For example, the gray scale weight of each subfield is 2 n by setting the gray scale weight of the first subfield SF1 to 2 0 and the gray scale weight of the second subfield to 2 1 , where n = The gray scale weight of each subfield may be determined to increase at a ratio of 0, 1, 2, 3, 4, and 5).

As such, by adjusting the light emission holding time in the light emitting period of each subfield according to the gray scale weight in the light emitting period of each subfield, it is possible to realize the grayscale of various images.

The organic light emitting display uses a plurality of frames to display an image of 1 second. For example, 60 frames are used to display an image of 1 second.

Here, the case where one frame is composed of six subfields has been illustrated and described. However, the number of subfields constituting one frame may be variously changed.

Further, although the subfields are arranged in increasing order of the gray scale weight in one frame, the subfields may be arranged in the order of decreasing gray scale weight in one frame, or regardless of the gray weight. Subfields may be arranged.

Next, referring to FIG. 3B, unlike FIG. 3A, a subfield having a bias period in one subfield has a bias period only in a sixth subfield SF6, which is a subfield having the highest gray scale weight, so that the light emitting device OLED may be used. Space charges stored in can be discharged. This is because the light emitting period is longest in the subfield having the highest gray scale weight, and therefore, the most space charges accumulate in the light emitting device OLED.

In addition, in FIG. 3B, a bias period may be provided in the last subfield even if the last subfield is not the subfield having the highest gray scale weight.

In FIG. 3A, a bias period is provided in all subfields and only one subfield in FIG. 3B, but is not limited thereto. A bias period may be provided in an appropriate number of subfields. In this way, by applying the reverse bias to the light emitting element (OLED) for a predetermined time. It is possible to prevent the light emitting device OLED from flowing in only one direction.

4 is an equivalent circuit diagram of a pixel of an organic light emitting display according to another exemplary embodiment of the present invention.

Referring to FIG. 4, a pixel 120 of an organic light emitting display device according to another exemplary embodiment includes a pixel driver 410, a light emitting device OLED, a first switching device S1 for controlling light emission, The second switching device S2 applies the reverse bias voltage Vbias. Here, other components except for the pixel driver 410 perform the same operation as the pixel 120 of the organic light emitting display described with reference to FIG. 2, and thus description thereof is omitted.

The pixel driver 410 may include a first transistor T1 for transferring the data signal Vdata from the scan line Sn and a capacitor Cst and a capacitor Cst for storing the data signal Vdata. Capacitor according to the erase signal V E from the second transistor T2 and the erase line En that generates a driving current corresponding to the difference between the data signal Vdata and the first power voltage V DD stored in A third transistor T3 for erasing the data signal Vdata stored in Cst may be included.

In detail, the first transistor T1 has a source connected to the data line Dm and a gate connected to the scan line Sn. The source of the second transistor T2 is connected to the source of the first power supply voltage V DD , the gate of the second transistor T2 is connected to the drain of the first transistor T1, and the capacitor Cst is connected between the gate and the source. The third transistor T1 has a source connected to a source of a first power supply voltage V DD and a drain connected to a gate of a second transistor T2.

Hereinafter, a method of driving an organic light emitting display device according to an embodiment of the present invention will be described in detail.

First, while the low level scan signal Vs is applied to the scan line Sn, the first transistor T1 is turned on so that the data signal Vdata connected from the data line Dm is connected to the gate of the second transistor T2. That is, one end of the capacitor Cst is applied.

Accordingly, the capacitor Cst has a voltage corresponding to the difference between the first power supply voltage V DD and the data signal Vdata, that is, the voltage V GS charged between the gate and the source of the second transistor M2. The second transistor M2 is charged, and the driving current I OLED corresponding to the charged voltage V GS flows to the drain.

In addition, when the light emission control signal V B2 becomes low during the above period, the first switching device S1 is turned on so that the driving current I OLED flows through the light emitting device OLED, thereby driving the driving current I OLED . In response to this, the light emitting element OLED emits light.

Next, while the low level erase signal V E is applied to the erase line En, the third transistor T3 is turned on to erase the data signal Vdata stored in the capacitor Cst to emit light. Stops emitting light.

Next, when the light emission control signal V B2 becomes high and the first switching device S1 is turned off and the reverse bias signal V B1 becomes low and the second switching device S2 is turned on, The reverse bias voltage Vbias higher than the first power supply voltage V DD is applied to the second electrode of the light emitting device OLED.

Accordingly, since a voltage having a higher level than that of the anode electrode is applied to the cathode of the light emitting device OLED, a reverse bias current flows through the light emitting device OLED. As a result, the space charge stored between the light emitting elements OLED may be discharged to increase the lifespan of the light emitting elements OLED.

5 is a diagram for describing a method of implementing image gray scale of an organic light emitting display device according to another exemplary embodiment.

First, referring to FIG. 5A, different from FIG. 3, the light emitting device may further include an erasing period in which light emission is stopped in a light emission period for implementing gray levels and a bias period for applying a reverse bias voltage Vbias according to the light emission time.

Therefore, each subfield is divided into an address period, an emission period, an erase period, and a bias period.

That is, the light emitting device OLED selects a subpixel to emit light by applying a scan signal Vs to an address section in one subfield, and starts to emit light by applying a data signal Vdata to the light emitting section. In the section, an erase signal V E for erasing the data signal Vdata stored in the capacitor Cst is applied to stop light emission.

Subsequently, in the organic light emitting diode display according to an exemplary embodiment of the present invention, a bias period is formed at the end of each subfield so that light emission is stopped and a reverse bias voltage Vbias is applied to the cathode electrode of the light emitting device OLED for a predetermined time. Is applied to discharge the space charge stored in the light emitting device (OLED).

Here, the address period, erase period, and bias period of each subfield may be the same for each subfield.

Next, referring to FIG. 5B, unlike FIG. 5A, a subfield having a bias period in one subfield has a bias period only in the sixth subfield SF6, which is a subfield having the highest gray scale weight, so that the light emitting device OLED may be used. Space charges stored in can be discharged. This is because the light emitting period is longest in the subfield having the highest gray scale weight, and therefore, the most space charges accumulate in the light emitting device OLED.

In addition, in FIG. 5B, a bias period may be provided in the last subfield even if the last subfield is not the subfield having the highest gray scale weight.

In FIG. 5A, a bias period is provided in all subfields and only one subfield in FIG. 5B, but is not limited thereto. A bias period may be provided in an appropriate number of subfields. In this way, by applying the reverse bias to the light emitting element (OLED) for a predetermined time. It is possible to prevent the light emitting device OLED from flowing in only one direction.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. will be. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

The organic light emitting display device according to the exemplary embodiment of the present invention as described above has an effect of extending the life of the device by sufficiently discharging the space charge accumulated in the light emitting device by applying a reverse bias to the light emitting device. .

Claims (7)

In an organic light emitting display device which displays an image by dividing one frame into a plurality of subfields, A pixel driver which receives a first power supply voltage and outputs a driving current corresponding to the data signal in response to a scan signal;       A light emitting device which emits light by the light corresponding to the driving current output from the pixel driver, and includes a first electrode connected to the pixel driver and a second electrode to which a second power supply voltage lower than the first power supply voltage is applied;       A first switching device connected to the second electrode and controlling light emission of the light emitting device; And       And a second switching device connected to the second electrode and applying a reverse bias voltage higher than the first power supply voltage to the second electrode. The method of claim 1,       And the second switching element is turned on when the first switching element is turned off.        The method of claim 1,        The pixel driver        A first transistor configured to transfer the data signal in response to the scan signal;        A capacitor for storing the data signal; And       And a second transistor for generating a driving current corresponding to the data signal.        The method of claim 1,        The pixel driver        A first transistor configured to transfer the data signal in response to the scan signal;        A capacitor for storing the data signal;        A second transistor generating a driving current corresponding to the data signal; And        And a third transistor configured to transfer the erase signal to erase the data signal stored in the capacitor.        The method of claim 1,        And the second switching element is turned on in at least one subfield of the plurality of subfields.        The method of claim 1,        And the second switching element is turned on in a subfield having the highest gray scale weight among the plurality of subfields.        The method of claim 1,        And the second switching element is turned on in the last subfield of the one frame.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8564587B2 (en) 2010-12-22 2013-10-22 Lg Display Co., Ltd. Organic light emitting diode display
KR20160007779A (en) * 2014-06-27 2016-01-21 엘지디스플레이 주식회사 Organic Light Emitting diode Display and Driving Method thereof
CN107591126A (en) * 2017-10-26 2018-01-16 京东方科技集团股份有限公司 Control method and its control circuit, the display device of a kind of image element circuit
CN107833559A (en) * 2017-12-08 2018-03-23 合肥京东方光电科技有限公司 Pixel-driving circuit, organic electroluminescence display panel and image element driving method
CN107924658A (en) * 2015-08-20 2018-04-17 三菱电机株式会社 LED display and driving device
WO2021197047A1 (en) * 2020-03-30 2021-10-07 Kunshan Yunyinggu Electronic Technology Co., Ltd. Pixel circuits for light emitting elements

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8564587B2 (en) 2010-12-22 2013-10-22 Lg Display Co., Ltd. Organic light emitting diode display
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