CN100481182C - Organic light emitting display and driving method thereof - Google Patents

Organic light emitting display and driving method thereof Download PDF

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Publication number
CN100481182C
CN100481182C CNB2005101165271A CN200510116527A CN100481182C CN 100481182 C CN100481182 C CN 100481182C CN B2005101165271 A CNB2005101165271 A CN B2005101165271A CN 200510116527 A CN200510116527 A CN 200510116527A CN 100481182 C CN100481182 C CN 100481182C
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signal
light emitting
organic light
data
emitting display
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CN1750100A (en
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金烘权
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Samsung Display Co Ltd
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Samsung Mobile Display Co Ltd
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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
    • G09G3/22—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
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD

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

Abstract

An organic light emitting display and a driving method thereof are disclosed which minimize non-uniform brightness due to the different properties of transistors due to their manufacture. The organic light emitting display comprises a plurality of pixels defined by a plurality of scan lines for supplying a scan signal, a plurality of data lines for supplying a data signal, and a plurality of power source lines. Each pixel comprises a pixel circuit for outputting current from the power source line corresponding to the data signal, wherein power is supplied to the power source line corresponding to a sub-frame. Each pixel further comprises an organic light emitting diode configured to emit light depending on the current outputted from the pixel circuit. With this configuration, desired gradation is represented by supplying the first power, having different voltage levels according to the digital data signals of the respective sub-frames, to an anode electrode of the organic light emitting diode. Thus, non-uniformity of brightness due to property difference between transistors in the pixel circuits is minimized.

Description

Organic light emitting display and driving method
Technical field
The present invention relates to a kind of organic light emitting display and driving method thereof, especially, relate to a kind of organic light emitting display and driving method thereof that minimizes non-uniform brightness owing to the property difference between the transistor.
Background technology
Because CRT monitor is heavier relatively and volume is bigger, therefore having developed various flat-panel monitors substitutes the cathode ray tube (CRT) display.The type of flat-panel monitor comprises LCD (LCD), field-emitter display (FED), plasma display panel (PDP) and organic light emitting display (LED).
Organic light emitting display utilizes the binding energy again in electronics and hole independent luminous, and it is divided into the inorganic-organic light emitting display that comprises inorganic emission layer, and the organic-organic light emitting display that comprises organic emission layer.This organic-organic light emitting display can be called electroluminescent display.
For example the passive display of LCD is different with needing arbitrary source, the same advantage of organic light emitting display with fast response time with the cathode ray tube (CRT) display, and do not rely on independently light source and luminous.
Fig. 1 is the circuit diagram of the interior pixel 11 that is provided of typical organic light emitting display.With reference to figure 1, organic light emitting display comprises a plurality of pixels 11 of the intersection region that is arranged in sweep trace Sn and data line Dm.When sweep signal puts on sweep trace Sn, select each independently pixel 11, and each independently pixel 11 is luminous according to the data-signal that puts on data line Dm.
Each pixel 11 comprises the first power lead VDD, second source line VSS, Organic Light Emitting Diode (OLED) and image element circuit 40.This OLED comprises anode that is connected in image element circuit 40 and the negative electrode that is connected in second source line VSS.
OLED comprises emission layer, electron transfer layer and the hole transmission layer that places between negative electrode and the anode.In addition, OLED can comprise electron injecting layer and hole injection layer.In present described OLED, when between anode and negative electrode, applying voltage, the electronics that produces from negative electrode moves to emission layer via electron injecting layer and electron transfer layer, and moves to emission layer from the hole that anode produces via hole injection layer and hole transmission layer.From the electronics of electron transfer layer with from hole combination again in emission layer of hole transmission layer, thus luminous.
Image element circuit 40 comprises the first transistor M1, transistor seconds M2 and capacitor C.The first and second transistor M1 and M2 are p type metal oxide semiconductor field effect transistor (PMOS FET).The voltage level of second source line VSS is lower than the voltage level of the first power lead VDD, and wherein second source line VSS can be an earth level.
The first transistor M1 comprises the grid that is connected in sweep trace Sn, the drain electrode that is connected in the source electrode of data line Dm and is connected in first node N1.In the operation, the first transistor M1 response offers first node N1 with data-signal from data line Dm by the sweep signal that sweep trace Sn sends.
When sweep signal offered sweep trace Sn, capacitor C is storage voltage corresponding to the data-signal that sends to first node N1 by the first transistor M1, when the first transistor M1 disconnects the ON time of transistor seconds M2 was remained a frame then.
Transistor seconds M2 comprises the grid that is connected in first node N1, and wherein the drain electrode of the first transistor M1 and capacitor C also are connected in first node N1 jointly.Transistor seconds M2 also comprises the source electrode that is connected in the first power lead VDD and is connected in the drain electrode of OLED anode.Transistor seconds M2 is configured to offer based on the data-signal adjustment that provides from the first power lead VDD current density of OLED.Therefore, OLED is based on the electric current that provides by transistor seconds M2 from the first power lead VDD and luminous.
Pixel 11 operations are as follows.At first, when low status scan signal is transferred to sweep trace Sn, connect the first transistor M1.Then, data-signal is provided for the grid of transistor seconds M2 via the first transistor M1 and first node N1 from data line Dm.Capacitor C is corresponding to the grid of transistor seconds M2 and the voltage difference between the first power lead VDD and storage voltage.
Then, transistor seconds M2 is by the voltage turn-on that puts on first node N1, and will offer OLED corresponding to the electric current of data-signal.Therefore, OLED is based on the galvanoluminescence that provides from transistor seconds M2, thereby display image.
When the high state sweep signal sent to sweep trace Sn, transistor seconds M2 kept conducting by the voltage that is stored among the capacitor C, and wherein this stored voltage is corresponding to data-signal.When the first transistor M1 disconnected, OLED is luminous to continue a frame, thereby demonstrates image.
Yet the shortcoming of traditional image element circuit 40 is, can not show to have image of uniform luminescence owing to the difference of the threshold voltage of used transistor seconds M2 in different pixel 11.A plurality of pixels 11 are arranged in the pixel portion of display image.Have image of uniform luminescence for pixel portion is shown, the threshold voltage of the transistor seconds M2 in a plurality of pixels 11 should be consistent with each other.Yet, since the mismachining tolerance in manufacture process, the threshold voltage difference of transistor seconds M2.Therefore, pixel portion can not show to have image of uniform luminescence.
Summary of the invention
Therefore, aspect of the present invention comprises organic light emitting display and driving method thereof, and it makes because the heterogeneity that the manufacturing variation between the transistor causes minimizes.
An embodiment of organic light emitting display comprises a plurality of pixels, these pixels by the multi-strip scanning line that is configured to provide sweep signal, be configured to provide many data lines and many power leads of data-signal to define.Each pixel comprises the image element circuit that is configured to from power lead output current and corresponding data signal, wherein the corresponding subframe of exporting from image element circuit of electric current.Display also comprises and being configured to respond from the electric current of image element circuit output and luminous Organic Light Emitting Diode.
In certain embodiments, based on the brightness summation of sending light in each subframe from Organic Light Emitting Diode, each pixel is represented gray scale.Data-signal comprises the digital data signal that has the i position corresponding to each subframe, and wherein i is a positive integer.In certain embodiments, when the position, position of digital data signal during near highest significant position, the power source voltage level increases.
Another embodiment of organic light emitting display comprises pixel portion, and this pixel portion comprises a plurality of pixels by multi-strip scanning line, many data lines and many first power lead definition.These pixel arrangement become response current and luminous, and this electric current is corresponding to the data-signal that sends by data line from first power lead.This display also comprise be configured to data-signal offer data line data driver, be configured to first power supply that sweep signal is offered the scanner driver of sweep trace and is configured to corresponding to the subframe of a certain frame first power supply be offered first power lead.
Another aspect of the present invention comprises the method that drives organic light emitting display, and this display comprises a plurality of pixels by multi-strip scanning line, many data lines and many power lead definition.This method comprises sweep signal is offered sweep trace, and data-signal is offered data line, corresponding to the subframe of a certain frame power supply is offered power lead, and corresponding to data-signal electric current is offered pixel so that each pixel is luminous from power lead.
The another embodiment of organic light emitting display comprises a plurality of pixels, and these pixels are by the multi-strip scanning line that sweep signal is provided, many data lines that data-signal is provided and many power leads definition.Each pixel comprises image element circuit, this image element circuit comprise be configured to corresponding from power lead data-signal and the transistor of output current, wherein the power lead subframe that is configured to corresponding a certain frame provides power supply.Image element circuit also comprises the compensating circuit that is configured to the compensation transistor threshold voltage.This display also comprises and being configured to respond from the electric current of image element circuit output and luminous Organic Light Emitting Diode.
In certain embodiments, organic light emitting display also comprises the launch-control line that is configured to provide emissioning controling signal, and the initialize power line that is configured to provide initialize power.
According to embodiments of the invention, based on the luminance brightness summation of launching from Organic Light Emitting Diode in each subframe, each pixel is represented gray scale.In certain embodiments, data-signal comprises that corresponding each subframe has the digital data signal of i position, and wherein i is a positive integer.In certain embodiments, when the position, position of digital data signal during near highest significant position, the power source voltage level increases.
Another embodiment of organic light emitting display comprises pixel portion, and this pixel portion comprises a plurality of pixels by multi-strip scanning line, many data lines and many power lead definition.Each pixel arrangement becomes response current and luminous, and this electric current is from the power lead reception and corresponding to the data-signal that sends by data line.This display also comprise be configured to data-signal offer data line data driver, be configured to sweep signal offer sweep trace scanner driver, be configured to power supply be offered the power supply of first power lead and be configured to provide initialize power to arrive the initialize power of each pixel corresponding to the subframe of a certain frame.
In certain embodiments, based on the luminance brightness summation of launching from Organic Light Emitting Diode in each subframe, each pixel is represented gray scale.In certain embodiments, data-signal comprises that corresponding each subframe has the digital data signal of i position, and wherein i is a positive integer.The power source voltage level increases when the more close highest significant position in the position, position of digital data signal.
Another aspect of the present invention comprises the method for driving by a plurality of pixels of multi-strip scanning line, many data lines and many power lead definition, and wherein the transistor of output current corresponding to the data-signal that provides by certain bar data line is provided each pixel.This method comprises the voltage that charges the capacitor to the transistor threshold voltage correspondence based on initialization electric power, and wherein corresponding to first sweep signal by first transmit scan line, this capacitor is recharged.This method also comprises data-signal is offered data line, the subframe of corresponding a certain frame offers power lead with electric power, charge the capacitor to the corresponding voltage of difference of data-signal and institute's supply capability, wherein corresponding to second sweep signal that provides by second sweep trace, this capacitor is recharged.This method also comprise by utilization be stored in the capacitor voltage drive transistor and from the power lead output current, come luminous to Organic Light Emitting Diode power supply.
Description of drawings
According to the description below in conjunction with accompanying drawing, each side of the present invention and advantage will become apparent and be more readily understood.
Fig. 1 is the circuit diagram of pixel in the typical organic light emitting display;
Fig. 2 is the diagram according to the organic light emitting display of first embodiment of the invention;
Fig. 3 is the block scheme of a certain embodiment of first power supply used in the organic light emitting display of Fig. 2;
Fig. 4 is the circuit diagram of a certain embodiment of pixel of the organic light emitting display of Fig. 2;
Fig. 5 is the signal waveforms that drives the organic light emitting display of Fig. 2;
Fig. 6 is the circuit diagram of second embodiment of pixel of second embodiment of organic light emitting display;
Fig. 7 is the signal waveforms that drives the organic light emitting display of the pixel of using Fig. 6;
Fig. 8 is the diagram of the 3rd embodiment of organic light emitting display;
Fig. 9 is the circuit diagram of the pixel that provides in the organic light emitting display of Fig. 8;
Figure 10 is the signal waveforms that drives the organic light emitting display of Fig. 8;
Figure 11 is the circuit diagram of a certain embodiment of the pixel that provides in the organic light emitting display; And
Figure 12 is the signal waveforms that drives the organic light emitting display of the pixel of using Figure 11.
Embodiment
Fig. 2 is the diagram of first embodiment that comprises the organic light emitting display 100 of pixel.With reference to figure 2, organic light emitting display 100 comprises pixel portion 110, scanner driver 120, data driver 130, first power supply 150 and second source 170.
Pixel portion 110 comprise by multi-strip scanning line S1 to SN, many data line D1 to DM and many power lead V1 to a plurality of pixels 111 of VN definition.Power lead V1 to VN be arranged to be formed at pixel portion 110 on sweep trace S1 parallel to SN.
When sweep signal sends to sweep trace S1 to SN, select independently pixel 111, and selected pixel 111 is based on the electric current that receives from power lead V1 to VN and luminous, this power lead V1 to VN corresponding to sending to the data-signal of data line D1 to DM.More specifically, the Organic Light Emitting Diode (OLED) in each pixel 111 is based on the electric current of digital data signal position correspondence and luminous, and the control of the element of pixel 111 is from the luminosity of OLED.This electric current is based on first power supply signal with different voltage levels, and first power supply signal offers power lead V1 to VN, so that the brightness of adjustment OLED is with the expression gray scale.Therefore display 100 can show to have the expection image gray.
The scan control signal that scanner driver 120 response slave controller (not shown) send for example initial pulse and clock signal produces sweep signal.Scanner driver 120 in turn offers sweep signal sweep trace S1 to SN, thereby sequentially driven sweep line S1 is to SN.
The data controlling signal that data driver 130 response controllers provide offers each pixel 111 to Dm with the digital data signal of i position by data line D1.Particularly, data driver 130 every j subframe offer data line D1 to DM with each digital data signal of i position, and wherein i is a positive integer, and j is the positive integer more than or equal to i.Here, subframe is set by a frame is divided at least two frames, and the gray scale of expression expection in each subframe.The digital data signal of least significant bit (LSB) (LSB) in the digital data signal of i position is provided with reference to first subframe in certain embodiments.
Second source 170 is configured to provide second electric power that is different from first electric power to arrive the negative electrode of each pixel 111.In certain embodiments, the negative electrode of each pixel 111 basically forms on the whole zone of pixel portion 110.
For every j the subframe that forms a certain frame, first power supply 150 is configured to produce mutually different first power supply signal.First power supply 150 is configured in turn driving electric be offered power lead V1 to VN, so that make driving electric and offer sweep trace S1 synchronous to the sweep signal of SN according to each digital data signal.In certain embodiments, when the position, position of digital data signal during near highest significant position, driving electric increases.
Fig. 3 is the block scheme of certain embodiment of first power supply 150 of organic light emitting display 100.Comprise electrical power generator 154, shift-register circuit 152 and selector switch 156 with reference to figure 3, the first power supplys 150.Power source generator 154 is configured to produce a plurality of first power supply signal VO with different voltage levels, and the first power supply signal VO is offered selector switch 156.
Shift-register circuit 152 comprises a plurality of shift registers.Each shift register is configured to sequentially start signal VSSS is displaced to sweep signal synchronous, thereby start signal VSSS is offered selector switch 156.Each shift register also is configured to be shifted k numerical digit (wherein k is a positive integer) in proper order and produce the voltage selector signal, and the voltage selector signal is offered selector switch 156.One eight (8) bit digital data-signals and eight subframes wherein are provided, and each shift register produces 3 voltage selector signal and provides it to selector switch 156.
Selector switch 156 comprises a plurality of voltage selectors.In certain embodiments, each voltage selector comprises an analog switch.Each voltage selector is configured to select one of a plurality of first different power supply signal V0, and this first power supply signal V0 correspondence provides from electrical power generator 154 from the voltage selector signal that each shift register of shift-register circuit 152 provides.Selector switch 156 also is configured to successively selected first power supply signal be offered the first power lead V1 to VN.In certain embodiments, successively from selector switch 156 offer the first power lead V1 to first power supply signal of VN with to offer sweep trace S1 synchronous to the sweep signal of SN.
Fig. 4 is the circuit diagram of an embodiment of pixel 111 in the organic light emitting display 100.With reference to figure 4, pixel 111 includes OLED OLED and image element circuit 140.
This OLED comprises the anode that is connected in image element circuit 140, and the negative electrode that is connected in the second source line VSS that is configured to provide second electric power.
This OLED comprises emission layer, electron transfer layer and the hole transmission layer that places between anode and the negative electrode.In addition, this OLED can comprise electron injecting layer and hole injection layer.During operation, when applying voltage between anode and negative electrode, the electronics that produces from negative electrode moves to emission layer via electron injecting layer and electron transfer layer, and moves to emission layer from the hole that anode produces via hole injection layer and hole transmission layer.Then, from the electronics of electron transfer layer with from hole combination again in emission layer of hole transmission layer, thus luminous.
Image element circuit 140 comprises the first transistor M1, transistor seconds M2 and capacitor C.In certain embodiments, the first and second transistor M1 and M2 are p type metal oxide semiconductor field effect transistor (PMOS FET).Wherein image element circuit 140 is configured to PMOS FET, and the voltage level of second source VSS is lower than the first power source voltage level.For example second source VSS can be an earth level.
The first transistor M1 comprises the grid that is connected in sweep trace Sn, the drain electrode that is connected in the source electrode of data line Dm and is connected in first node N1.The first transistor M1 response offers first node N1 with data-signal from data line Dm by the sweep signal that sweep trace Sn sends.
Transistor seconds M2 comprises the grid that is connected in first node N1, and wherein the drain electrode of the first transistor M1 and capacitor C also are connected in first node N1 jointly.Transistor seconds M2 also comprises the source electrode that is connected in the first power lead Vn and is connected in the drain electrode of OLED anode.Transistor seconds M2 adjusts current density from the first power lead VDD to OLED based on the voltage that offers himself grid from capacitor C.
Capacitor C comprises first electrode that is connected in first node N1, and this node is coupled to the grid of transistor seconds M2.Capacitor also comprises second electrode that is connected in the first power lead Vn.In this, when sweep signal sent to sweep trace Sn, stored voltage sent to first node N1 by the first transistor M1 to the corresponding digital data signal of capacitor C with store voltages.When the first transistor M1 disconnected, it was each subframe of a frame that capacitor C makes transistor seconds M2 keep ON time.In the operation, this OLED is based on the electric current that provides by transistor seconds M2 from the first power lead Vn and luminous.
Fig. 5 is the signal waveforms that drives the organic light emitting display of Fig. 2.With reference to figure 5, for the gray scale of representing by control brightness to expect, organic light emitting display 100 is operated to SFj by a frame being divided into j subframe SF1, its.Corresponding to the digital data signal of i position everybody and have the identical emission cycle.In certain embodiments, first to j subframe SF1 has gray scale corresponding to different weights brightness to SFj.Here, be respectively 2 corresponding to first to j subframe SF1 to the gray scale ratio of the brightness of SFj 0: 2 1: 2 2: 2 3: 2 4: 2 5: ...: 2 j
In certain embodiments, organic light emitting display 100 operations are as follows.At first, in the first subframe SF1 of a frame, low sweep signal SS1 sends to sweep trace S1 to SN successively to SSn, and simultaneously, the first electric power VDD1 with first voltage level offers the first power lead V1 to VN respectively.The responding scanning signal and first power supply signal are connected to sweep trace S1 separately and connect successively to the first transistor M1 of each pixel 111 of SN.Therefore, the first bit digital data-signal is fed into the grid (referring to Fig. 4) of each transistor seconds M2 via the first transistor M1 in each pixel 111 and first node N1.At this moment, the corresponding voltage of difference of each capacitor C storage and first digital data signal at first power supply signal VDD1 with first voltage level and first node N1 place.
When high sweep signal SS1 offers each sweep trace S1 to Sn successively to SSN, be provided for the gate terminal of each transistor seconds M2 corresponding to the voltage of the first bit digital data-signal of storing among each capacitor C.In response, based on the first power supply signal VDD1 with first level, each transistor seconds M2 offers each OLED with the electric current corresponding with the first bit digital data-signal from the first power lead V1 to VN.
In first subframe, based on the first power supply signal VDD1 with first voltage level, OLED receives the electric current corresponding to stored voltage among the capacitor C, just as providing by the first power lead V1 to VN.Then, OLED sends gray scale for " 0 " or " 2 0" the light of brightness.In certain embodiments, when the first bit digital data-signal was " 0 ", this OLED sent corresponding to " 2 0" light of brightness of gray scale, but when the first bit digital data-signal is " 1 ", then not luminous.
In the 2nd subframe SF2, low sweep signal SS1 sends to sweep trace S1 to SN successively to SSn, and the while, and the second source VDD2 that has greater than second voltage level of the first voltage level VDD1 offers power lead V1 to VN.Responding scanning signal and second source signal, be connected in the first transistor M1 successively conducting of each sweep trace S1, make the 2nd bit digital data-signal be provided for the grid of each transistor seconds M2 via the first transistor M1 on each pixel 111 and first node N1 to SN.At this moment, the corresponding voltage of difference of each capacitor C storage and the 2nd digital data signal at second source VDD2 with second voltage level and first node N1 place.
When high sweep signal SS1 offered each sweep trace S1 to Sn successively to SSN, the voltage of the 2nd bit digital data-signal of storing among corresponding each capacitor C was provided for the gate terminal of each transistor seconds M2.As its response, based on second source signal VDD2, transistor seconds M2 offers OLED from second source line V1 to VN with the electric current corresponding with the 2nd bit digital data-signal.
In the 2nd subframe, based on the second source VDD2 that provides by the first power lead V1 to VN, this OLED receive be stored in capacitor C in the corresponding electric current of voltage.Respond received electric current, this OLED emission gray scale is " 0 " or " 2 1" the light of brightness.Just, when the 2nd bit digital data-signal was " 0 ", this OLED sent correspondence " 2 1" light of brightness of gray scale, but then not luminous when the 2nd bit digital data-signal is " 1 ".
Similarly, in the 3rd subframe SF3, OLED sends correspondence " 0 " or " 2 according to as hereinbefore mode according to the electric current that is received 2" light of brightness of gray scale.Corresponding the 3rd bit digital data-signal of this electric current and based on the 3rd power supply signal VDD3 with tertiary voltage level, wherein the tertiary voltage level is higher than second voltage level of second source VDD2, and wherein provides the 3rd power supply signal VDD3 by the first power lead V1 to VN.Therefore, when the 3rd bit digital data-signal was " 0 ", this OLED sent correspondence " 2 2" light of brightness of gray scale, but then not luminous when the 3rd bit digital data-signal is " 1 ".
A frame the 4th to j subframe SF4 to SFj, according to the 4th to the corresponding electric current of j bit digital data-signal, this OLED sends corresponding to " 0 " or " 2 3" to " 2 i" light of brightness of gray scale.This electric current is based on has the 4th power supply signal VDD4 to VDDj to the j voltage level, and wherein the level of each power supply signal increases to VDDj from VDD4.
Therefore, in organic light emitting display 100, the voltage level of the first power supply signal VDD1 to VDDj that offers this OLED anode is according to each subframe SF1 to SFj and difference.Therefore, the expection gray scale that is used for single frame is represented by the brightness summation of each subframe SF1 to SFj.Particularly, the different voltage levels of the first power supply signal VDD1 to VDDj are every corresponding to i bit digital data-signal, and for each subframe SF1 to SFj, digital data signal is provided for the first power lead V1 to VN, and wherein these subframes have the identical emission cycle.Therefore, organic light emitting display 100 can show to have the expection image gray.
Therefore, utilization has the organic light emitting display 100 of the power supply signal of different voltage levels for the expection gray scale, has minimized the non-uniform brightness that causes owing to the property difference between the transistor in the pixel 111.And subframe SF1 to SFj has the identical emission cycle, thereby has guaranteed expression gray scale time enough.
Fig. 6 is the circuit diagram of second embodiment of pixel 111 among organic light emitting display second embodiment, and Fig. 7 is the signal waveforms that drives the organic light emitting display of the pixel that comprises second embodiment.With reference to figure 6 and 7, pixel 111 have with first embodiment in identical structure, except be in dopant type (N-MOS type) different of transistor M1 and M2 of image element circuit 140 with the transistor among first embodiment.
According to second embodiment, organic light emitting display is operated in the same manner with first embodiment basically, except the polarity difference of sweep signal so that driving N transistor npn npn M1 and M2.The driving method of the organic light emitting display of second embodiment is identical with first embodiment 100 basically, therefore omits here and discusses.
In the embodiment of above-mentioned organic light emitting display, each pixel 111 comprises two transistor M1 and a M2 and a capacitor C.Yet pixel 111 is not limited thereto, and wherein each pixel can also comprise at least two transistors and at least one capacitor.
Fig. 8 is the diagram of organic light emitting display 800 the 3rd embodiment, and with reference to figure 8, organic light emitting display 800 comprises pixel portion 110, scanner driver 120, data driver 130, first power supply 150, second source 170 and initialize power 160.
Pixel portion 110 comprises a plurality of pixels 111 by multi-strip scanning line S1 to SN, many data line D1 to DM and many first power lead V1 to VN definition.In certain embodiments, the first power lead V1 to VN be arranged to be formed on pixel portion 110 on sweep trace S1 to SN parallel.
When sweep signal sends to sweep trace S1 to SN, select independently pixel 111, and this selected pixel based on the electric current that receives from power lead V1 to VN and luminous, this power lead is corresponding to sending to the data-signal of data line D1 to DM.Pixel 111 comprises an OLED, and the brightness Be Controlled of this OLED, and wherein based on the electric current corresponding with the position of digital data signal, this OLED is luminous.This electric current offers first power supply signal of power lead V1 to the different voltage levels of VN based on having, and makes the brightness of adjusting OLED with the expression gray scale, therefore, shows to have the expection image gray on display.Each pixel 111 is based on the emissioning controling signal that sends to launch-control line E1 to EN and luminous in addition.
Scanner driver 120 is configured to respond scan control signal that the slave controller (not shown) sends, and for example initial pulse and clock signal produce sweep signal.Scanner driver 120 in turn offers sweep signal sweep trace S1 to SN, thereby sequentially driven sweep line S1 is to SN.Scanner driver 120 also is configured to produce emissioning controling signal and it is sequentially offered launch-control line E1 to EN.
Data driver 130 is configured to respond data controlling signal that slave controller provides and to DM the digital data signal of i position is offered each pixel 111 by data line D1.Particularly, data driver 130 every j subframe offer data line D1 to DM with each digital data signal of i position, and wherein i is a positive integer, and j is the positive integer more than or equal to i.In certain embodiments, the digital data signal of least significant bit (LSB) (LSB) is provided in first subframe in the digital data signal.
Second source 170 is configured to provide the second source line of second source signal to each pixel 111.In certain embodiments, the second source line of each pixel 111 is electrically connected on the negative electrode of each pixel 111, and wherein this negative electrode basically forms on the whole zone of pixel portion 110.
Initialize power 160 is configured to provide initialization electric power to each pixel 111.
For each subframe that forms a frame, first power supply 150 is configured to produce first power supply signal with different voltage levels.Therefore first power supply 150 is used in turn first power supply signal being offered power lead V1 to VN, and according to digital data signal, first power supply signal is with to offer sweep trace S1 synchronous to the sweep signal of SN.In certain embodiments, when the position, position of digital data signal during near highest significant position, the voltage level of first power supply signal becomes higher.First power supply 150 of organic light emitting display 800 has essentially identical structure with organic light emitting display 100, therefore omits detailed description.
Fig. 9 is the circuit diagram of a certain embodiment of the pixel 111 that provided in the organic light emitting display 800 of Fig. 8.With reference to figure 9, pixel 111 comprises an OLED and an image element circuit 140.This OLED comprises the anode that is connected in image element circuit 140, and the negative electrode that is connected in the second source line of supply second source VSS.
Image element circuit 140 comprises the first transistor M1, transistor seconds M2, the 3rd transistor M3 and compensating circuit 144.Compensating circuit 144 comprises the 4th transistor M4, the 5th transistor M5 and capacitor C.In a certain embodiment, transistor M1, M2, M3, M4 and M5 are p type metal oxide semiconductor field effect transistor (PMOS FET).Wherein image element circuit 140 is set to PMOS FET, and as shown in Figure 9, the voltage level of second source signal VSS is lower than the voltage level of the first power supply signal VDD.For example, second source VSS can be an earth level.
The first transistor M1 comprises the grid that is connected in sweep trace Sn, the drain electrode that is connected in the source electrode of data line Dm and is connected in the source electrode of the 3rd transistor M3.The first transistor M1 response offers digital data signal the source electrode of the 4th transistor M4 of compensating circuit 144 by first sweep signal that n bar sweep trace Sn sends from data line Dm.
The source electrode of the drain electrode that the 4th transistor M4 comprises the grid that is connected in first node N1, be connected in the first transistor M1 and be connected in first node N1 and the drain electrode of the drain electrode of the 5th transistor M5.The grid of the 4th transistor M4 and drain electrode mutually are electrically connected, and therefore the 4th transistor M4 is connected between the source electrode of the drain electrode of the first transistor M1 and the 5th transistor M5 as diode.
The 5th transistor M5 comprises the source electrode of the grid that is connected in n-1 bar sweep trace Sn-1, the drain electrode that is connected in the 4th transistor M4 and first node N1 and the drain electrode that is connected in initialize power line Vint.In operation, the 5th transistor M5 response sends to second sweep signal of n-1 bar sweep trace Sn-1, and initialization electric power is offered first node N1 from initialize power line Vint.
Transistor seconds M2 comprises the grid that is connected in first node N1, the drain electrode that is connected in the source electrode of the first power lead Vn and is connected in the source electrode of the 3rd transistor M3.In operation, transistor seconds M2 outputs to the 3rd transistor M3 with electric current from the first power lead Vn, and wherein this electric current is corresponding to the voltage between grid that is applied to transistor seconds and the source electrode.
Therefore, the second and the 4th transistor M2 and M4 are electrically connected mutually to form current mirror.Thereby, suppose that second has identical channel width with the 4th transistor M2 with M4, then about identical digital data signal, identical electric current flows into the second and the 4th transistor M2 and M4.
Capacitor C comprises and is connected in first node N1, promptly is connected in first electrode of the second and the 4th transistor M2 and each grid of M4 jointly, and second electrode that is connected in the first power lead Vn.In operation, capacitor C corresponding to the initialize power that offers first node N1 by the 5th transistor M5 with store voltages in this, simultaneously second sweep signal is sent to n-1 bar sweep trace Sn-1.When first sweep signal offered n sweep trace Sn, according to institute's stored voltage, capacitor C connected transistor seconds M2, thus the digital data signal that storage provides by the first and the 4th transistor M1 and M4.Be stored in numerical data voltage among the capacitor C and equal voltage poor of the threshold voltage vt h of the 4th transistor M4 and digital data signal.
When the first transistor M1 disconnected, capacitor C kept each subframe of conducting by institute's stored voltage with transistor seconds M2.Therefore, response offers first electric power of the first power lead V1 to VN, and the voltage Vgs that is provided between the grid of transistor seconds M2 and the source electrode equals the voltage difference between the threshold voltage of the voltage of digital data signal and the 4th transistor M4.
The 3rd transistor M3 comprises the grid that is connected in launch-control line En, the source electrode that is connected in the drain electrode of transistor seconds M2, and the drain electrode that is connected in the OLED anode.In operation, the 3rd transistor M3 correspondence offers OLED with electric current from transistor seconds M2 by the emissioning controling signal that launch-control line En provides.Therefore, this OLED is based on the galvanoluminescence that is provided by the 3rd transistor M3 from transistor seconds M2.
In the organic light emitting display 800 of the compensating circuit 144 that comprises Fig. 9, second of current mirror has similar or identical characteristic with the 4th transistor M2 with M4.Therefore capacitor C stores the voltage difference between the threshold voltage of the digital data signal of each numerical digit and the 4th transistor M4, has wherein ignored the threshold voltage of transistor seconds M2, thereby has compensated different threshold voltages at transistor seconds M2 place.
Therefore, this OLED is coupled in the image element circuit 140 of Fig. 9, and it comprises compensating circuit 144, and its response is from the electric current of the first power lead Vn and luminous, provides this electric current corresponding to the digital data signal of each numerical digit.As a result, no matter be included in difference between the threshold voltage of the transistor seconds M2 in each pixel, can show to have image of uniform luminescence according to the organic light emitting display of the embodiment of the invention.
Figure 10 is the signal waveforms of organic light emitting display 800.With reference to Figure 10, everybody of the digital data signal of organic light emitting display 800 corresponding i positions operates by a frame being divided into j subframe SF1 to SFj, and wherein each subframe has the identical emission cycle.Because the difference of threshold voltage is divided into subframe with frame and has been avoided non-uniform brightness between the transistor seconds M2 of each pixel 111, and by controlling the expression that brightness has caused the expection gray scale.First to j subframe SF1 to SFj has the gray scale of corresponding different weighting brightness.In a certain embodiment, corresponding first to j subframe SF1 is respectively 2 to the gray scale of the brightness of SFj 0: 2 1: 2 2: 2 3: 2 4: 2 5: ...: 2 j
With reference to Figure 10, the first subframe SF1 of a frame comprises initialization cycle, and the wherein low second sweep signal SS1 to SSn sends to the preceding sweep trace SN successively to SN-1, thereby connects the 5th transistor M5 of each pixel 111 by sweep trace Sn-1.When the 5th transistor M5 conducting, the initialize power signal is offered first node N1 by the 5th transistor M5 from initialize power line Vint.The initialize power that offers first node N1 is stored among the capacitor C.Behind the negative edge of predetermined period, the low second sweep signal SSn to SSn-1 changes high state into, has therefore disconnected the 5th transistor M5, thereby has finished initialization cycle.
Simultaneously, when the low first and second sweep signal SS offered the preceding sweep trace SN to SN-1 and current scan line S1 to SN, the 3rd transistor M3 was disconnected by the high emission control signal ES that provides by launch-control line En.
In the first subframe SF1 of a frame, the low first sweep signal SS1 to SSn-1 sends to current scan line S1 to SN successively, thereby has connected the first transistor M1 of each pixel 111 in addition.Simultaneously, the first power supply signal VDD1 with first voltage level offers the first power lead V1 to VN, and synchronous with the low first sweep signal SS1 to SSn that offers current scan line S1 to SN.Therefore, when the first transistor M1 conducting, the first bit digital data-signal that offers data line Dm offers the source electrode of the 4th transistor M4.The 4th transistor M4 is by the initialize power conducting (turned) that is stored among the capacitor C, and the first bit digital data-signal is offered first node N1 from the first transistor M1.Therefore, the capacitor C of each pixel 111 is charged to the voltage that correspondence offers the first bit digital data-signal of first node N1.Be stored in voltage among the capacitor C and equal to be applied to voltage difference between the threshold voltage vt h of the first bit digital data-signal of first node N1 and the 4th transistor M4.
With reference to Figure 10, behind the negative edge of a predetermined period, the low first sweep signal SS1 to SSn changes high state into.Respond the first high sweep signal, disconnect the first and the 4th transistor M1 and M4, and utilize the voltage that is stored among the capacitor C that transistor seconds M2 is remained on conducting state.Therefore, the transistor seconds M2 of each pixel 111 is by the driven that is stored among the capacitor C, and the corresponding first power vd D1 of transistor seconds M2 offers the 3rd transistor M3 with the difference that is stored in the voltage among the capacitor C with electric current, and first voltage level that provides by the first power lead V1 to VN is provided this first power vd D1.
When the low first and second sweep signal SS that offer respectively at preceding sweep trace SN to SN-1 and current scan line S1 to SN change high state into, low emissioning controling signal ES is provided for launch-control line En, thereby connect the 3rd transistor M3 of each pixel 111, it provides the electric current from transistor seconds M2 to OLED.
Therefore, in first subframe, the corresponding first bit digital data-signal, OLED are from the second and the 3rd transistor M2 and M3 received current, and wherein this electric current is based on the first power vd D1 with first voltage level that provides by the first power lead V1 to VN.This OLED responds this electric current and sends and have " 0 " or " 2 0" light of gray scale intensities.In a certain embodiment, when the 1st bit digital data-signal was " 0 ", this OLED sent correspondence " 2 0" light of gray scale intensities, but then not luminous when the 1st bit digital data-signal is " 1 ".
Similarly, in the 2nd subframe SF2, OLED sends corresponding " 0 " or " 2 in the mode identical with the 1st subframe SF1 1" light of gray scale intensities.The electric current of corresponding the 2nd bit digital data-signal is depended in light emitted brightness, wherein this electric current is based on the second source signal VDD2 with second voltage level, and the first power vd D1 that provide, that have first voltage level by the first power lead V1 to VN is provided this power supply signal.
Equally, a frame the 3rd to j subframe SF3 to SFj, OLED sends correspondence " 0 " or " 2 according to corresponding the 3rd electric current to j bit digital data-signal 2" to " 2 1" light of gray scale intensities.This electric current is based on having the 3rd power supply signal VDD3 to VDDj to the j voltage level, and wherein the voltage level between each power supply signal increases.
Therefore, in organic light emitting display 800, compensating circuit 144 is configured to compensate the threshold voltage vt h of transistor seconds M2.In addition, the first power supply signal VDD1 to VDDj that offers the OLED anode has different voltage levels according to each subframe SF1 to SFj, and therefore the gray scale of expection is represented by the summation of the brightness of each subframe SF1 to SFj.Therefore, the non-uniform brightness that causes owing to the property difference between the transistor is minimized in display 800.In addition, subframe SF1 to SFj has the identical emission cycle, thereby has guaranteed expression gray scale time enough.
Figure 11 is the circuit diagram of the 4th embodiment of the pixel 111 that provides of organic light emitting display, and Figure 12 is the signal waveforms that drives the organic light emitting display of the 4th embodiment that is equipped with pixel 111.With reference to Figure 11 and 12, pixel 111 has the similar structure with the 3rd embodiment, except the transistor M1 to M5 of image element circuit 140 is nmos pass transistors.Therefore, image element circuit 140 is coupled in OLED, and this OLED has the polarity opposite with the connection of image element circuit shown in Figure 9.Similarly, drive signal shown in Figure 12 and drive signal shown in Figure 10 are similar, except having opposite polarity for driving N MOS transistor signal.Therefore, utilize the organic light emitting display of the pixel of Figure 11 to operate according to being similar to about organic light emitting display 800 described modes.Thereby omission is to its description.
In the embodiment of above-mentioned organic light emitting display, each subframe has the identical emission cycle.Yet, the invention is not restricted to this structure, and each subframe can have different emission cycles and represents and picture quality to improve gray scale.
In addition, pixel, organic light emitting display and the driving method thereof that comprises same parts can be finished in the display device of display image by Control current arbitrary.
Although above-mentioned detailed description is showed, is described and points out that the present invention is applied to the new feature of different embodiment, be appreciated that described device that those skilled in the art do or process in form or the various abreviations in the details, substitute and change and do not break away from essence of the present invention.Range describe of the present invention is in appended claim rather than above-mentioned instructions.The variation that all authority requires to bring in the meaning of equal value and the scope all is included in their scope.
The application require on September 15th, 2004 Korea S Department of Intellectual Property application, application number is the interests of the korean patent application of 10-2004-73661 and 10-2004-73662, at this in conjunction with its disclosed content as a reference.

Claims (49)

1. organic light emitting display, it comprises a plurality of pixels, these pixels by the multi-strip scanning line that is configured to provide sweep signal, be configured to provide many data lines of data-signal and be configured to provide many power leads of power supply signal to limit, each pixel comprises:
Image element circuit, be configured to export the electric current corresponding to described data-signal, wherein, described electric current is imported from described power lead, described power lead provides corresponding power supply signal for each subframe in a plurality of subframes relevant with a frame video data, and wherein each respective electrical source signal is different mutually; And
Organic Light Emitting Diode is configured to based on from the output current of image element circuit and luminous.
2, according to the organic light emitting display of claim 1, wherein, each pixel shows the total gray scale of brightness of the light that depends on that the described Organic Light Emitting Diode in each subframe sends.
3, according to the organic light emitting display of claim 1, wherein, described data-signal comprises that corresponding each subframe has the digital data signal of i position, and wherein i is a positive integer.
4, according to the organic light emitting display of claim 3, wherein, the voltage level of described power supply signal is along with the position position of described digital data signal from first " 1 " of highest significant position increases near this highest significant position.
5, according to the organic light emitting display of claim 3, wherein, the supply of described power supply signal and described sweep signal are synchronous to the transmission of sweep trace.
6, according to the organic light emitting display of claim 1, wherein, described power lead and described sweep trace are arranged in parallel.
7, according to the organic light emitting display of claim 1, wherein, described image element circuit comprises:
The first transistor, it is subjected to described sweep signal control and is configured to outputting data signals;
Transistor seconds, it is configured to provide electric current from described power lead to Organic Light Emitting Diode corresponding to the voltage that is applied between this transistor seconds grid and the source electrode; And
Capacitor, it is configured to store the described data-signal from the first transistor output, and controls the voltage that is applied between transistor seconds grid and the source electrode based on institute's stored data signal.
8, a kind of organic light emitting display comprises:
Pixel portion, it comprises a plurality of pixels by multi-strip scanning line, many data lines and many first power lead definition, wherein, each first power lead is connected in one-row pixels, wherein, and luminous, wherein, described electric current provides corresponding to the data-signal that sends by described data line and from described first power lead each pixel arrangement one-tenth in response to the electric current that receives from its first power lead separately;
Data driver, it is configured to described data-signal is offered described data line;
Scanner driver, it is configured to a plurality of sweep signals are offered described sweep trace; And
First power supply, it is configured to corresponding to each of a plurality of subframes relevant with a frame video data the first different mutually power supply signals be offered first power lead.
9, organic light emitting display according to Claim 8, wherein, each pixel shows based on the total gray scale of the brightness of the light that sends in each subframe.
10, organic light emitting display according to Claim 8, wherein, described data-signal comprises the digital data signal with i position of corresponding each subframe, wherein i is a positive integer.
11, according to the organic light emitting display of claim 10, wherein, the voltage level of described first power supply signal is along with the position position of described digital data signal from first " 1 " of highest significant position increases near this highest significant position.
12, organic light emitting display according to Claim 8, wherein, described first power supply signal and described sweep signal are synchronous.
13, organic light emitting display according to Claim 8, wherein, described first power lead and described sweep trace are arranged in parallel.
14, organic light emitting display according to Claim 8, wherein, described first power supply comprises:
Electrical power generator, it is configured to produce the power supply signal with different voltage levels;
Shift-register circuit, it is configured to produce the voltage selector signal corresponding to each subframe; And
Selector circuit, it is configured to select to have in the power supply signal of different voltage levels one corresponding to described voltage selector signal, and is configured to selected power supply signal is offered at least one the first power leads.
15, organic light emitting display according to Claim 8 also comprises second source, and it is configured to produce the second source signal that is different from first power supply signal, and is configured to the second source signal is offered the second source line that is connected with each pixel.
16, according to the organic light emitting display of claim 15, wherein, each pixel comprises:
Image element circuit, it is configured to corresponding to the electric current of described data-signal ground output from the input of first power lead; And
Organic Light Emitting Diode, it is coupled between described image element circuit and the second source line, and is configured to based on the output current of described image element circuit and luminous.
17, a kind of method that drives organic light emitting display, this organic light emitting display comprises a plurality of pixels, and wherein these pixels are by multi-strip scanning line, many data lines and many power lead definition, and this method comprises:
Sweep signal is offered described sweep trace;
Data-signal is offered described data line;
Corresponding to a plurality of subframes relevant each, mutual different power supply signal is offered described power lead with a frame video data; And
Electric current is offered pixel make pixel luminous, wherein, this electric current is provided for described pixel based on power supply that is provided and corresponding described data-signal.
18, according to the method for claim 17, wherein, each pixel comprises Organic Light Emitting Diode, and wherein each pixel all shows the gray scale of the brightness summation of the light that depends on that the Organic Light Emitting Diode from each subframe sends.
19, according to the method for claim 18, wherein, described data-signal comprises the digital data signal with i position corresponding to each subframe, and wherein i is a positive integer.
20, according to the method for claim 19, wherein, the power source voltage level that is provided is along with the position position of described digital data signal from first " 1 " of highest significant position increases near this highest significant position.
21, according to the method for claim 17, wherein, provide power supply with synchronous to described transmit scan line sweep signal to described power lead.
22, a kind of organic light emitting display, it comprises that each pixel comprises by the multi-strip scanning line that sweep signal is provided, a plurality of pixels of many data lines of data-signal being provided and many power leads definition of power supply signal being provided:
Image element circuit, it comprises the first transistor, this the first transistor is configured to corresponding to described data-signal from described power lead output current, wherein, provide different power supply signal mutually corresponding in a plurality of subframes relevant each with a frame video data, and wherein said image element circuit also comprises compensating circuit, and this compensating circuit is configured to compensate described transistor threshold voltage; And
Organic Light Emitting Diode, it is configured to based on the output current of image element circuit and is luminous.
23, according to the organic light emitting display of claim 22, also comprise:
Launch-control line, it is configured to emissioning controling signal is offered image element circuit; And
The initialize power line, it is configured to initialize power is offered image element circuit.
24, according to the organic light emitting display of claim 23, wherein, image element circuit comprises:
By the transistor seconds of controlling by first sweep signal of first transmit scan line, wherein, transistor seconds is configured to described data-signal is outputed to described compensating circuit, and wherein the first transistor also is configured to export and the corresponding electric current of exporting from described compensating circuit of voltage; And
The 3rd transistor, it is subjected to described emissioning controling signal control and is configured to described electric current is offered described Organic Light Emitting Diode from the first transistor.
25, according to the organic light emitting display of claim 24, wherein, described compensating circuit comprises:
The 4th transistor, it is coupled to transistor seconds with the current mirror structure, and wherein, the 4th transistor arrangement becomes described data-signal is outputed to the first transistor from transistor seconds;
The 5th transistor, it is by second sweep signal control that provides by second sweep trace, and wherein, the 5th transistor arrangement becomes initialize power is offered first node, and wherein, first node is connected in the second and the 4th transistorized grid; And
Be connected in the capacitor between first node and the described power lead.
26, according to the organic light emitting display of claim 22, wherein, each pixel shows the gray scale of the brightness summation of the light that sends based on the Organic Light Emitting Diode from each subframe.
27, according to the organic light emitting display of claim 26, wherein, described data-signal comprises the digital data signal with i position of corresponding each subframe, and wherein i is a positive integer.
28, according to the organic light emitting display of claim 27, wherein, the voltage level of described power supply signal increases near this highest significant position with the position, position of described digital data signal from first " 1 " of highest significant position.
29, according to the organic light emitting display of claim 22, wherein, described power supply signal and the described signal Synchronization of retouching.
30, according to the organic light emitting display of claim 22, wherein, described power lead and described sweep trace are arranged in parallel.
31, a kind of organic light emitting display, it comprises:
Pixel portion comprises a plurality of pixels by multi-strip scanning line, many data lines and many power lead definition, wherein, each pixel arrangement becomes response from the electric current of power lead and luminous, wherein, the data-signal corresponding to sending by described data line offers described pixel with described electric current;
Data driver, it is configured to described data-signal is offered described data line;
Scanner driver, it is configured to described sweep signal is offered described sweep trace;
Power supply, it is configured to corresponding to a plurality of subframes relevant with a frame video data each, and mutual different power supply signal is offered first power lead; And
Initialize power, it is configured to initialize power is offered each pixel.
32, according to the organic light emitting display of claim 31, wherein, each pixel shows the gray scale based on the brightness summation of the light that sends in each subframe.
33, according to the organic light emitting display of claim 31, wherein, described data-signal comprises the digital data signal with i position of corresponding each subframe, and wherein i is a positive integer.
34, according to the organic light emitting display of claim 33, wherein, the voltage level of described power supply signal increases near this highest significant position with the position, position of described digital data signal from first " 1 " of highest significant position.
35, according to the organic light emitting display of claim 33, wherein, described first power supply signal and described sweep signal are synchronous.
36, according to the organic light emitting display of claim 31, wherein, described power supply comprises:
Power source generator, it is configured to produce the power supply signal with different voltage levels;
Shift-register circuit, it is configured to produce the voltage selector signal corresponding to each subframe; And
Selector circuit, it is configured to select to have in the power supply signal of different voltage levels one corresponding to the voltage selector signal, and wherein, described selector circuit also is configured to selected power supply signal is offered described power lead.
37, according to the organic light emitting display of claim 31, it also comprises:
Launch-control line, it is configured to emissioning controling signal is offered described image element circuit;
The initialize power line, it is configured to initialize power is offered described image element circuit.
38, according to the organic light emitting display of claim 37, wherein each pixel comprises:
Image element circuit, comprise the transistor that is configured to export corresponding to the electric current of described data-signal, wherein, described output current is based on the power supply that provides by described power lead according to each subframe, and wherein said image element circuit also comprises the compensating circuit that is configured to compensate described transistorized threshold voltage; And
Organic Light Emitting Diode, it is configured to based on from the output current of described image element circuit and luminous.
39, according to the organic light emitting display of claim 38, wherein, described image element circuit comprises:
The first transistor, it is subjected to the control by first sweep signal of first transmit scan line, and wherein, the described data-signal that described the first transistor is configured to send by described data line outputs to described compensating circuit;
Transistor seconds, it is configured to provide electric current corresponding to the voltage from described compensating circuit output by described power lead;
The 3rd transistor, control of the described emissioning controling signal that provides by described launch-control line is provided for it, and is configured to the electric current from transistor seconds is offered described Organic Light Emitting Diode.
40, according to the organic light emitting display of claim 39, wherein, described compensating circuit comprises:
Be coupled to the 4th transistor of transistor seconds with the current mirror structure, wherein said the 4th transistor arrangement becomes described data-signal is outputed to transistor seconds from the first transistor;
The 5th transistor the control of second sweep signal that provides by second sweep trace is provided, and is configured to described initialize power is offered the first node that is coupled to the second and the 4th transistorized grid; And
Capacitor, it is connected between first node and the described power lead.
41, according to the organic light emitting display of claim 31, wherein, described power lead and described sweep trace are arranged in parallel.
42, a kind of method that drives a plurality of pixels, these a plurality of pixels are by multi-strip scanning line, many data lines and many power lead definition, wherein each pixel comprises the transistor that is configured to output current, and this electric current is corresponding to by data-signal that data line provides wherein, and this method comprises:
Based on initialize power, adopt the voltage corresponding that capacitor is charged with described transistorized threshold voltage, wherein, capacitor is charged corresponding to first sweep signal by first transmit scan line;
Described data-signal is offered described data line;
Power supply signal is offered described power lead, and wherein each power supply signal is different mutually corresponding to each and these power supply signals of a plurality of subframes relevant with a frame video data;
Adopt with described data-signal and described power supply signal between poor corresponding voltage capacitor is further charged, wherein, capacitor is charged corresponding to second sweep signal that provides by second sweep trace; And
Utilization is stored in the described transistor of driven in the capacitor, and from the power supply of supply power line output current, thereby it is luminous to allow OLED.
43, according to the method for claim 42, wherein each pixel shows the gray scale based on the brightness summation of the light that sends in each subframe.
44, according to the method for claim 43, wherein, described data-signal comprises the digital data signal with i position corresponding to each subframe, and wherein i is a positive integer.
45, according to the method for claim 44, wherein, the first power source voltage level increases near this highest significant position with the position, position of described digital data signal from first " 1 " of highest significant position.
46, according to the method for claim 42, wherein, first power supply is synchronous to the supply and the described sweep signal of first power lead.
47, according to the method for claim 42, wherein, described data-signal offers described capacitor via the reflection transistor that couples with current mirror structure and described transistor, and wherein provides described data-signal corresponding to second sweep signal.
48, according to the method for claim 42, also comprise:
According to emissioning controling signal electric current is offered Organic Light Emitting Diode from transistor.
49, a kind of driving comprises the method for the organic light emitting display of a plurality of pixels, and this method comprises:
Sweep signal is offered at least one pixel;
Data-signal is offered at least one pixel;
Mutual different power supply signal is offered at least one pixel, and wherein each power supply signal is corresponding in a plurality of subframes relevant with a frame video data each; And
Electric current is offered Organic Light Emitting Diode, makes that described Organic Light Emitting Diode is luminous, wherein, described electric current is offered described Organic Light Emitting Diode corresponding to described data-signal, and wherein this electric current based on the power supply that is provided.
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