CN1933687B - Light-emitting device and method of driving the same - Google Patents

Light-emitting device and method of driving the same Download PDF

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Publication number
CN1933687B
CN1933687B CN2006100041469A CN200610004146A CN1933687B CN 1933687 B CN1933687 B CN 1933687B CN 2006100041469 A CN2006100041469 A CN 2006100041469A CN 200610004146 A CN200610004146 A CN 200610004146A CN 1933687 B CN1933687 B CN 1933687B
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data
circuit
voltage
pixel
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CN1933687A (en
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金志勋
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LG Electronics Inc
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LG Electronics Inc
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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]
    • G09G3/3216—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 a passive matrix
    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0248—Precharge or discharge of column electrodes before or after applying exact column voltages
    • 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
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • 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
    • G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data

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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 Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

A light-emitting device avoids a cross-talk phenomenon. The device includes a precharge controlling circuit and a precharge circuit. The precharge controlling circuit provides a precharge controlling signal in accordance with display data input from an external source. The precharge circuit applies a precharge current corresponding to display data and a scan line resistance to the data lines in accordance with the precharge controlling signal transmitted from the precharge controlling circuit. As a result, precharge current is applied to data lines according to a pixel cathode voltage, and thus cross-talk occurs is eliminated or at least substantially reduced in the device.

Description

Luminescent device and driving method thereof
Technical field
The present invention relates generally to a kind of luminescent device, more specifically, relate to a kind of electroluminescent device and driving method thereof.
Background technology
Fig. 1 shows the organic electroluminescence device of first prior art.This device comprises panel 100, control circuit 102, scan drive circuit 104, discharge circuit 106, pre-charge circuit 108 and data drive circuit 110.
Panel 100 comprises a plurality of sub-pixels (sub-pixel) (E11 to E44) in the zone that is formed at data line crossing (D1 to D4) and sweep trace (S1 to S4).Each sub-pixel is corresponding to red sub-pixel, green sub-pixels or blue subpixels, and each pixel comprises redness, green and blueness (RGB) sub-pixel.
Control circuit 102 is received from the video data of external source input.Video data for example can be the RGB data.Circuit 102 is by using the operation of element in the video data control organic electroluminescence device that receives.Scan drive circuit 104 forms on a direction of panel 100, and sequentially sweep signal is transferred to sweep trace (S1 to S4).
Discharge circuit 106 comprises switch (SW) and Zener diode (ZD).Be switched on or switched off switch (SW) by control signal from control circuit 102.For example, when data line (D1 to D4) discharged, switch (SW) was connected.As a result, data line (D1 to D4) is connected to Zener diode ZD, and the electric charge on the data line (D1 to D4) is discharged to the Zener voltage of Zener diode (ZD).
Pre-charge circuit 108 will be applied to data line (D1 to D4) corresponding to the pre-charge current of video data according to the control of control circuit 102.Data drive circuit 110 will be applied to data line (D1 to D4) corresponding to the data current (data current) of video data according to the control of control circuit 102.
Fig. 2 A and Fig. 2 B show the circuit of the organic electroluminescence device that is used to drive Fig. 1, and Fig. 2 C illustrates the pixel of how control chart 2A and Fig. 2 B with luminous sequential chart.First resistance (RS) between outmost sub-pixel and the ground has the value of 10 Ω.Second resistance (RP) between sub-pixel has the value of 2 Ω.In addition, each launches the light that has corresponding to the brightness of 3amp data current in pixel (E41) and the pixel (E42).And (E11, E21 and E31) is not luminous for sub-pixel.In addition, each in the sub-pixel (E12, E22 and E32) is launched the light that has corresponding to the brightness of 1amp data current.
In order to make sub-pixel E11 to E41 luminous along sweep trace S1, pre-charge circuit 108 will be applied to E11 to E41 sub-pixel (seeing Fig. 2 A) corresponding to the pre-charge current of video data.As a result, during first precharge time (pcha1), will be pre-charged to the E41 sub-pixel corresponding to the electric charge of second voltage (V2, default pre-charge voltage), as shown in Fig. 2 C.
Subsequently, will be respectively 0,0,0 and the data current (I11 to I41) of 3amp be applied to data line (D1 to D4).In this case, the anode voltage of E41 sub-pixel (VA41) rises to tertiary voltage (V3) always, and it is corresponding to cathode voltage (VC41) with corresponding to the 4V voltage sum of the 3amp data current of T1 time durations.Then, anode voltage (VA41) reaches stable tertiary voltage (V3) after sometime.At this, cathode voltage (VC41) be 48V, and V3 is 52V thus for the whole electric currents (0,0,0 and 3amp summation) that pass first sweep trace (S1) multiply by the resistance (summations of 10,2,2 and 2 Ω) of sweep trace.Therefore, to have corresponding to 4V be the light of the gray shade scale of the difference between anode voltage (VA41) and the cathode voltage (VC41) for E41 sub-pixel emission.
As shown in Fig. 2 B, pre-charge circuit 108 will be applied to E12 to E42 sub-pixel corresponding to the pre-charge current of video data.As a result, during second precharge time (pcha2), will be pre-charged to the E42 sub-pixel, as further illustrating among Fig. 2 C corresponding to the electric charge of second voltage (V2, default pre-charge voltage).
Subsequently, will correspond respectively to 1,1,1 and the data current (I12 to I42) of 3amp be applied to data line (D1 to D4).In this case, the anode voltage of E42 pixel (VA42) rises to corresponding to cathode voltage (VC42) with corresponding to the 4th voltage (V4) of the 4V voltage sum of the 3amp data current of T2 time durations always.Then, anode voltage (VA42) reaches stable the 4th voltage (V4) after sometime.At this, cathode voltage (VC42) be 96V, and V4 is 100V thus for all electric currents (1,1,1 and 3amp summation) that pass second sweep trace (S2) multiply by the resistance (summations of 10,2,2 and 2 Ω) of sweep trace.
In a word, the stable anode voltage (VA42) of E42 sub-pixel and the difference between the pre-charge voltage (V2) are higher than the difference of stable anode voltage (VA41) and pre-charge voltage (V2).Therefore, T2 is greater than T1.As a result, it is required that the charge number that stable anode voltage (V42) consumes in the E42 sub-pixel is higher than in the E41 sub-pixel stable anode voltage (VA41), as shown in Fig. 2 C.Therefore, design E42 sub-pixel is luminous with the gray shade scale level identical with the E41 sub-pixel, but in fact, it launches the light that has less than the gray shade scale level of E41 sub-pixel.The so-called crosstalk phenomenon of this phenomenon.
Fig. 3 shows the organic electroluminescence device of second prior art.This device comprises panel 300, control circuit 302, first scan drive circuit 304, second scan drive circuit 306, discharge circuit (for example circuit of ground connection), pre-charge circuit 310 and data drive circuit 312.(because except first scan drive circuit 304 and second scan drive circuit 306, those of the element of this embodiment and first embodiment are identical, so will omit any further description about similar elements).
First scan drive circuit 304 is transferred to first sweep signal one group of sweep trace (S1 and S3) on a direction of panel.Second driving circuit 306 is transferred to second sweep signal sweep trace (S2 and S4) of remainder on the other direction of panel.With the same in the first prior art organic electroluminescence device, in the second prior art organic electroluminescence device crosstalk phenomenon takes place.Equally, the luminescence process in second device is similar to this device, and omits any more detailed description relevant with this process thus.
Summary of the invention
An object of the present invention is to address the above problem at least and/or shortcoming, and advantage described below at least is provided.
Another object of the present invention is to prevent to crosstalk.
According to one embodiment of present invention, the controller that is used for luminescent device comprises precharge control circuit and pre-charge circuit, and wherein said luminescent device has a plurality of sub-pixels in the zone of data line crossing of being formed at and sweep trace.Precharge control circuit is based on the display data transmissions precharge control signal.Based on the precharge control signal from the precharge control circuit transmission, pre-charge circuit will be applied to data line corresponding to the pre-charge current of video data and sweep trace resistance.Pre-charge current quantity equals substantially corresponding to the sub-pixel cathode voltage with corresponding to the amount of current of the summation of the voltage of video data.Controller also comprises the scan drive circuit that in one direction sweep signal is transferred to sweep trace.Controller also comprises second scan drive circuit that first sweep signal is transferred to first scan drive circuit of some sweep traces and second sweep signal is transferred to remaining sweep trace.Pre-charge circuit comprises D-A converter (DAC).Precharge control circuit memory scanning line resistance value, and by sweep trace resistance and video data calculating pre-charge current quantity.
According to one embodiment of present invention, a kind of its each all have a luminescent device of the sub-pixel in the zone of data line crossing of being formed at and sweep trace driving method comprise: video data is converted to translation data corresponding to sweep trace resistance; And will be applied to data line corresponding to the data current of translation data.This method comprises that also the discharge data line is to the discharge level corresponding to translation data.The step of discharge data line comprises the level voltage of output corresponding to translation data; With the level voltage of buffering output to produce sparking voltage.The step of conversion video data comprises the sub-pixel cathode voltage of calculating corresponding to video data, and produces the translation data corresponding to the cathode voltage that calculates.The translation data that produces is corresponding to the cathode voltage that is stored in the data in the look-up table.
Electroluminescent device according to an embodiment of the invention comprises a plurality of sweep traces, data line and sub-pixel.Sweep trace is set on first direction.Data line is set on second direction, and first direction is different from second direction.Each sub-pixel all comprises corresponding sweep trace and corresponding data line.At this, for at least one sub-pixel that is coupled to the corresponding data line, the corresponding data line of precharge is to first voltage of stipulating the gray shade scale level, and at least one other sub-pixel that is coupled to the corresponding data line, precharge corresponding data line is to second voltage of stipulating the gray shade scale level, wherein the first and second voltage differences.With first rate of change from corresponding data line to the first voltage of assigned voltage precharge, and with second rate of change from corresponding data line to the second voltage of assigned voltage precharge, and wherein second rate of change is different from first rate of change.Second rate of change is greater than first rate of change.This corresponding data line of precharge before the demonstration time.Voltage on the corresponding data line of at least one sub-pixel is from first change in voltage to the first saturation voltage, and the voltage on the corresponding data line of at least one other sub-pixel is from second change in voltage to the second saturation voltage, and wherein first saturation voltage is different from second saturation voltage.From first rate of change of first voltage to the first saturation voltage with identical from second rate of change of second voltage to the second saturation voltage.In the cycle very first time, reach first saturation voltage, and in second time cycle, reach second saturation voltage, and first and second time cycles are substantially the same.Electroluminescent device is an organic electroluminescence device.
Electroluminescent device is included in a plurality of sweep traces on the first direction according to an embodiment of the invention, a plurality of data lines on second direction, and sub-pixel, and wherein first direction is different with second direction.Each sub-pixel comprises corresponding sweep trace and corresponding data line.At this, for at least one sub-pixel that is coupled to the corresponding data line, corresponding data line to the first voltage of precharge, and after this, from first voltage to first saturation voltage of stipulating the gray shade scale level, and at least one other sub-pixel that is coupled to the corresponding data line, corresponding data line to the second voltage of precharge, and after this, from second voltage to second saturation voltage of stipulating the gray shade scale level, wherein first saturation voltage is different from second saturation voltage, and is different from second rate of change from second voltage to the second saturation voltage from first rate of change of first voltage to the first saturation voltage.First saturation voltage reached in the cycle very first time, and second saturation voltage reaches in second time cycle, and first and second time cycles are basic identical.First and second voltages are identical.
Electroluminescent device comprises the electroluminescent device of a plurality of sub-pixels in a kind of zone with the data line crossing of being formed at and sweep trace according to an embodiment of the invention, comprise: controller, it receives video data and exports a plurality of control signals from external source; Scanner driver, its response sequentially is transferred to sweep signal described sweep trace from first control signal of described controller; Data converter, its second control signal that is used to respond from described controller is converted to translation data with described video data, and exports described translation data; Data driver, it is used for and will offers described data line with the corresponding data current of described translation data from described data converter; And discharger, the 3rd control signal that it is used to respond from described control will be charged to the charge discharge of described data line.
As mentioned above, in luminescent device according to the present invention and driving method thereof, based on the cathode voltage of pixel (or sub-pixel) pre-charge current is applied to data line, and in panel, has avoided crosstalk phenomenon thus.In addition, according to another embodiment, based on the cathode voltage of pixel data current is applied to data line, and has avoided the crosstalk phenomenon in panel thus.
In the following description, part is listed another object of the present invention, advantage and feature, and for those skilled in the art, based on the check of following content, its part is conspicuously maybe can know from enforcement of the present invention.As particularly pointing out in the additional claim, can realize and obtain objects and advantages of the present invention.
Description of drawings
To describe the present invention in detail with reference to figure below, reference number identical among the figure is represented components identical, wherein:
Fig. 1 is the figure that the first prior art luminescent device is shown;
Fig. 2 A and Fig. 2 B are the circuit diagrams that is used in the process of the luminescent device that drives Fig. 1, and Fig. 2 C is the sequential chart of luminescence process that the pixel of Fig. 2 A and Fig. 2 B is shown;
Fig. 3 is the figure that the luminescent device of second prior art is shown;
Fig. 4 is the figure according to the luminescent device of first embodiment of the invention;
Fig. 5 A is according to first embodiment of the invention, circuit diagram about the process of the luminescent device that drives Fig. 4, Fig. 5 B is according to another embodiment of the present invention, and about the circuit diagram of the process of the luminescent device that drives Fig. 4, and Fig. 5 C is the sequential chart about the luminescence process among Fig. 5 A and Fig. 5 B;
Fig. 6 is according to another embodiment of the present invention, about the circuit diagram of the luminescence process of the luminescent device of Fig. 4;
Fig. 7 is the figure of luminescent device according to a second embodiment of the present invention;
Fig. 8 is the figure of the luminescent device of a third embodiment in accordance with the invention;
Fig. 9 is the figure that is included in the data converting circuit in the device of Fig. 8;
Figure 10 A is according to one embodiment of present invention, circuit diagram about the process of the luminescent device that drives Fig. 8, Figure 10 B is according to another embodiment of the present invention, about the circuit diagram of the process of the luminescent device that drives Fig. 8, and Figure 10 C is the sequential chart about the luminescence process relevant with Figure 10 B with Figure 10 A;
Figure 11 is the figure of the luminescent device of a fourth embodiment in accordance with the invention; With
Figure 12 is the figure of luminescent device according to a fifth embodiment of the invention.
Embodiment
Fig. 4 is according to the first embodiment of the present invention, is preferably the figure of the luminescent device of organic electroluminescence device.This device comprises panel 400, scan drive circuit 402, control circuit 404, precharge control circuit 406, pre-charge circuit 408 and data drive circuit 410.Panel 400 comprises a plurality of sub-pixels (E11 to E44) in the zone that is formed at data line crossing (D1 to D4) and sweep trace (S1 to S4).Side along panel forms scan drive circuit 402, and its preferred sequence ground is transferred to sweep trace (S1 to S4) with sweep signal.
Control circuit 404 storages are from the video data of external source input.These data are for example from the RGB data.Control circuit 404 is by using the operation of video data gated sweep driving circuit 402, precharge control circuit 406, pre-charge circuit 408 and the data drive circuit 410 stored.Precharge control circuit 406 calculates will be applied to the pre-charge current quantity of data line (D1 to D4) under the control of control circuit 404, and the precharge control signal that will have a quantity information of calculating is transferred to pre-charge circuit 408.
Pre-charge circuit 408 will be applied to data line (D1 to D4) corresponding to the pre-charge current of the quantity of calculating according to the precharge control signal from precharge control circuit 406 transmission.According to one embodiment of present invention, pre-charge circuit 408 comprises D-A converter (DAC) and the pre-charge current by one of using DAC to produce to have in a plurality of levels.Data drive circuit 410 will be applied to data line (D1 to D4) corresponding to the data current of the video data of controlling circuit 404 transmission certainly.As a result, sub-pixel (E11 to E44) sends the light with a certain wavelength.
Fig. 5 A is according to one embodiment of present invention, about the circuit diagram of the process of the luminescent device that drives Fig. 4.Fig. 5 B is according to another embodiment of the present invention, and about the circuit diagram of the process of the luminescent device that drives Fig. 4, and Fig. 5 C is the sequential chart about the luminescence process among Fig. 5 A and Fig. 5 B.Suppose that first resistance (RS) between a sub-pixel and ground has predetermined value.For illustrative purposes, this value can be 10 Ω.Equally, suppose that aforesaid sub-pixel is outmost pixel, yet, alternatively, can use another sub-pixel according to the present invention.
In addition, suppose that second resistance (RP) between sub-pixel has predetermined value, for example 2 Ω.In sub-pixel (E41) and the sub-pixel (E42) each is sent to be had corresponding to the predetermined data current such as the light of 3amp brightness.(E11, E21 and E31) is not luminous for unselected sub-pixel.In addition, each of sub-pixel (E12, E22 and E32) is sent and is had corresponding to the predetermined data current such as the light of 1amp brightness.
Now with description control sub-pixel (E11 to E41) along the luminous process of first sweep trace (S1).With reference to figure 5A, precharge control circuit 406 uses about the information that is stored in resistance (RS and RP) wherein and controls the video data calculating cathode voltage (VC41) that circuit 404 transmits certainly.In other words, precharge control circuit 406 detects the size of data current (I11 to I41) by video data.At this, each of the data current (I11 to I41) of detection has following unrestriced value respectively: 0,0,0 and 3amp.Subsequently, precharge control circuit 406 calculates cathode voltages (VC41 is as 48V), and this cathode voltage is whole electric currents (0,0,0 and 3A summation) resistance of multiply by sweep trace (10,2,2 and the summation of 2 Ω, hereinafter referred to as " sweep trace resistance ").
Then, precharge control circuit 406 precharge control signal that will have about the information of the cathode voltage (VC41) that calculates is transferred to pre-charge circuit 408.Subsequently, during first precharge time (pcha1), pre-charge circuit 408 according to the transmission precharge control signal, by the 4th data line (D4) pre-charge current is applied to sub-pixel.As a result, the electric charge corresponding to the summation (49V) of cathode voltage (VC41 is as 48V) and default pre-charge current (for example 1V) is precharged to sub-pixel (E41).At this, default pre-charge current relates to the voltage that is respectively the pre-charge current under 0V and the 3A situation corresponding to cathode voltage (VC41) and data current.
Then, during the low logical time (low logic time) of first sweep signal (PS1), data drive circuit 410 will be applied to data line (D1 to D4) corresponding to the data current (I11 to I41) of the video data of controlling circuit 404 transmission certainly.As a result, at the T1 that finishes from precharge after the time, the anode voltage (VA41) of sub-pixel (E41) is stabilized to 52V (for example, saturation voltage), as shown in Fig. 5 C.Therefore, sub-pixel (E41) sends the light that has corresponding to the gray shade scale level of 4V (52V-48V).
Luminescence process corresponding to the sub-pixel (E12 to E42) of second sweep trace (S2) will be described now.With reference to figure 5B, precharge control circuit 406 uses based on the information that is stored in resistance (RS and RP) wherein and controls the video data calculating cathode voltage (VC42) that circuit 404 transmits certainly.In other words, precharge control circuit 406 detects the size of data current (I12 to I42) by video data.At this, the data current (I12 to I42) of detection for example is respectively 1,1,1 and 3A.Subsequently, precharge control circuit 406 calculates cathode voltages (VC42, for example 96V), and this cathode voltage is that whole electric currents (1,1,1 and 3A summation) multiply by sweep trace resistance (10,2,2 and 2 Ω summation).
Then, precharge control circuit 406 precharge control signal that will have about the information of the cathode voltage (VC42) that calculates is transferred to pre-charge circuit 408.Subsequently, during second precharge time (pcha2), pre-charge circuit 406 according to the transmission precharge control signal, by the 4th data line (D4) pre-charge current is applied to sub-pixel (E42).As a result, will (for example, the electric charge of summation 1V) (97V) be pre-charged to sub-pixel (E42) corresponding to cathode voltage (VC42, for example 96V) and default pre-charge current.At this, default pre-charge current relates to the voltage that is respectively the pre-charge current under the situation of 0V and 3A corresponding to cathode voltage (VC42) and data current.
Then, during the low logical time of second sweep signal (PS2), data drive circuit 410 will be transferred to data line (D1 to D4) corresponding to the data current (I12 to I42) of the video data of controlling circuit 404 transmission certainly.At this, cathode voltage (VC42) is 96V, and thus, as shown in Fig. 5 C, anode voltage (VA42) should increase to 100V, so that sub-pixel sends the light that has corresponding to the gray shade scale level of 4V.In this case, owing to the pre-charge voltage (V4) corresponding to sub-pixel (E42) is 97V, so after having increased 3V, anode voltage (VC42) is stable.Therefore,, finish precharge T1 certainly after the time, stablizing anode voltage (VA42) (for example having reached saturation voltage) with identical in sub-pixel (E41).
In a word, in luminescent device of the present invention, after having finished precharge time T 1, sub-pixel (E41) and sub-pixel (E42) (for example, having reached saturation voltage or burning voltage) have been stablized.Therefore, be different from prior art, in luminescent device of the present invention, identical with at the dt2 time durations of the consumption of dt1 time durations electric charge.Therefore, sub-pixel (E41) has identical brightness with sub-pixel (E42), and therefore crosstalk phenomenon can not take place in luminescent device of the present invention.
Fig. 6 is according to another embodiment of the present invention, about the circuit diagram of the luminescence process that luminescent device carried out of Fig. 4.At this, sum up pre-charge voltage by Fig. 6.
Below preferably list pre-charge voltage:
(1) can pass through V CR(n)+V Default-prechage-red(DR (n)) provides the first pre-charge voltage (V corresponding to ruddiness PRE-CHARGE-RED(n));
(2) can pass through V CG(n)+V Default-prechage-green(DR (n)) provides the second pre-charge voltage (V corresponding to green glow PRE-CHARGE-GREEN(n)); With
(3) can pass through V CG(n)+V Default-prechage-blue(DR (n)) provides the 3rd pre-charge voltage (V corresponding to blue light PRE-CHARGE-blue(n)).
At this, V CR(n), V CG(n) and V CB(n) for corresponding respectively to the cathode voltage of ruddiness, green glow and blue photons pixel.Equally, be under the situation of 0V at cathode voltage, V Default-prechage-red(DR (n)), V Default-prechage-green(DR (n)) and V Default-prechage-blue(DR (n)) is for corresponding respectively to the pre-charge voltage of ruddiness, green glow and blue light video data.In other words, luminescent device of the present invention is applied to data line (D1 to D4) according to cathode voltage with pre-charge current.The method of calculating cathode voltage is described by the example among Fig. 5 A to Fig. 5 C.
According to another embodiment of the present invention, luminescent device is plasma display panel (PDP) or LCD (LCD), and wherein the electrode voltage according to the unit is applied to data line with pre-charge current.
Fig. 7 is the figure that according to a second embodiment of the present invention luminescent device is preferably organic electroluminescence device.This device comprises panel 700, the first scan drive circuit 702, the second scan drive circuits 704, control circuit 706, precharge control circuit 708, pre-charge circuit 710 and data drive circuits 712.Except first scan drive circuit 702 and second scan drive circuit 704, the element of this embodiment is preferably identical with among first embodiment those.
In operation, first scan drive circuit 702 along side of panel 700 or direction first sweep signal is offered a part (S1 and S3) in the sweep trace (S1 to S4).The sweep trace (S2 and S4) that second scan drive circuit 704 offers second sweep signal other along another side or the direction of panel 700.
With identical in first embodiment, in a second embodiment, can pre-charge current be applied to data line (D1 to D4) according to cathode voltage.Equally, similar among the luminescence process among second embodiment and first embodiment.
Fig. 8 is the figure that the luminescent device of a third embodiment in accordance with the invention is preferably organic electroluminescence device.This device comprises panel 800, control circuit 802, scan drive circuit 804, discharge circuit 806, pre-charge circuit 808, data converting circuit 810 and data drive circuit 812.Panel 800 comprises a plurality of sub-pixels (E11 to E44) in the zone that is formed at data line crossing (D1 to D4) and sweep trace (S1 to S4).
Control circuit 802 is received from the video data of external source input, and the operation of element in the controlling light emitting device.Video data for example is the RGB data.Side or direction along panel 800 form scan drive circuit 804, and under the control of control circuit 802, preferred sequence ground is transferred to sweep trace (S1 to S4) with sweep signal.In other words, scan drive circuit 804 sequentially is connected to ground with sweep trace (S1 to S4).
Discharge circuit 806 comprises switch (SW) and discharge level circuit 820.Under the control of control circuit 802, be switched on or switched off switch (SW).For example, when discharge data line (D1 to D4), connect switch (SW).As a result, data line (D1 to D4) is connected to discharge level circuit 820, and the charge discharge that therefore will be charged to data line (D1 to D4) is to a certain level.Pre-charge circuit 808 will be applied to data line (D1 to D4) corresponding to the pre-charge current of video data under the control of control circuit 802.
Data converting circuit 810 converts video data to the translation data corresponding to the cathode voltage of sub-pixel (E11 to E44) under the control of control circuit 802.In other words, because the sweep trace resistance of each sweep trace (S1 to S4) influences the cathode voltage of sub-pixel (E11 to E44), so data converting circuit 810 is converted to translation data with video data, with the compensated scanning line resistance.In addition, data converting circuit 810 offers data drive circuit 812 with translation data.Data drive circuit 812 will offer data line (D1 to D4) corresponding to the data current of translation data, and therefore send light with the corresponding pixel of data current.
Fig. 9 is the figure that can be used on one type data converting circuit among Fig. 8.This data converting circuit 810 comprises counting circuit 900, storer 902 and consults circuit 904.The resistance of storer 902 memory scanning lines (S1 to S4).
Counting circuit 900 calculates the cathode voltage corresponding to the pixel of sweep trace, and the cathode voltage that calculates offered consults circuit 904.At this, cathode voltage multiply by data current corresponding to video data for sweep trace resistance.Consult circuit 904 and comprise look-up table with at least one translation data, and according to one in the translation data that comprises in the cathode voltage selection look-up table that provides from counting circuit 900.At this, the data of selection are corresponding to cathode voltage.
Then, consult circuit 904 translation data of selecting is offered data drive circuit 812.At this, the translation data of selection can out of true ground identical with cathode voltage, and in this case, it is similar to the cathode voltage in the translation data very much.Therefore, design can be according to sweep trace with the brightness of the pixel of sending same brightness and inequality, but the user of panel 800 is unaware of this difference.
Figure 10 A is according to one embodiment of present invention, about the circuit diagram of the process of the luminescent device that drives Fig. 8.Figure 10 B is according to another embodiment of the invention, and about the circuit diagram of the process of the luminescent device that drives Fig. 8, and Figure 10 C is the sequential chart about the luminescence process relevant with Figure 10 B with Figure 10 A.In this circuit, first resistance (RS) is positioned between a sub-pixel (for example, outmost sub-pixel) and the ground, and has predetermined value, for example 10 Ω.In addition, second resistance (RP) between sub-pixel has predetermined value, for example 2 Ω.And each in sub-pixel (E41) and the sub-pixel (E42) is sent to be had based on the predetermined data current such as the light of 3amp brightness.And sub-pixel (E11, E21 and E31) in some cases for example can be not luminous based on the image that shows.In addition, each in the sub-pixel (E12, E22 and E32) is sent the light that has corresponding to the brightness of the data current of for example 1amp.
To describe now corresponding to the luminescence process in the sub-pixel (E11 to E41) of first sweep trace (S1).With reference to figure 10A, pre-charge circuit 808 will be applied to data line (D1 to D4) corresponding to the pre-charge current of video data.Therefore, the electric charge corresponding to second voltage (V2) is pre-charged to data line (D1 to D4).
Subsequently, counting circuit 900 uses based on information that is stored in the resistance (RS and RP) in the storer 902 and the video data of controlling circuit 802 transmission certainly and calculates cathode voltage (VC41).In other words, counting circuit 900 detects data current (I11 to I41) by video data.At this, each in the data current (I11 to I41) of detection is 0,0,0 and 3amp.
Then, counting circuit 900 calculates cathode voltages (VC41, for example 48V), and this cathode voltage multiply by sweep trace resistance (summations of 10,2,2 and 2 Ω) for whole electric currents of passing first sweep trace (S1) (0,0,0 and 3A summation).Subsequently, counting circuit 900 first signal calculated of information that will have a cathode voltage (VC41) of calculating is transferred to and consults circuit 904.Consulting circuit 904 then selects to offer data drive circuit 812 corresponding to the translation data of cathode voltage in the look-up table (VC41) and with the translation data of selecting.
During the low logical time of first sweep signal (PS1), data drive circuit 812 will offer data line (D1 to D4) corresponding to the data current (I11 to I41) of consulting the translation data that circuit 904 provides certainly.As a result, finish certainly preliminary filling electrometric sometime after, the anode voltage (VA41) of sub-pixel (E41) stabilizes to V3 (for example, voltage reaches capacity), as shown in Figure 10 C.At the voltage corresponding to 3A is under the situation of 4V, and the anode voltage (VA41) of sub-pixel (E41) stabilizes to 52V, its each voltage that reaches capacity.Therefore, sub-pixel (E41) can send the light that has corresponding to the gray shade scale level of 4V (52V-48V).
Luminescence process corresponding to the sub-pixel (E12 to E42) of second sweep trace (S2) will be described now.With reference to figure 10B, pre-charge circuit 808 will be applied to data line (D1 to D4) corresponding to the pre-charge current of video data, and be pre-charged to data line (D1 to D4) corresponding to the electric charge of second voltage (V2) thus.Subsequently, counting circuit 900 uses based on the information that is stored in the resistance (RS and RP) in the storer 902 and controls the video data calculating cathode voltage (VC42) that circuit 802 transmits certainly.In other words, counting circuit 900 detects data current (I12 to I42) by video data.At this, each that detects data current (I12 to I42) can be 1,1,1 and 3amp.
Counting circuit 900 calculates cathode voltages (VC42, for example 96V), and cathode voltage multiply by sweep trace resistance (summations of 10,2,2 and 2 Ω) for whole electric currents of passing second sweep trace (S2) (1,1,1 and 3A summation).Subsequently, circuit 900 will have second signal calculated about the information of the cathode voltage (VC42) that calculates and offer and consult circuit 904.Consulting circuit 904 selects then the translation data of selecting to be transferred to data drive circuit 812 corresponding to the translation data of inspecting cathode voltage (VC42) in the circuit.
During the low logical time of second sweep signal (PS2), data drive circuit 812 will be applied to data line (D1 to D4) corresponding to the data current (I12 to I42) of the translation data of consulting circuit 904 transmission certainly.As a result, finish certainly preliminary filling electrometric sometime after, the anode voltage (VA42) of sub-pixel (E42) stabilizes to V4 (for example, voltage reaches capacity), as shown in Figure 10 C.At the voltage corresponding to 3A is under the situation of 4V, and the anode voltage (VA42) of pixel (E42) stabilizes to 100V, and for example, voltage reaches capacity.At this, cathode voltage (VC42) is higher than cathode voltage (VC41), and thus, the data current (I42) that will be higher than data current (I41) is applied to the 4th data line (D4), as shown in Figure 10 C.
In other words, be higher than as slope as slope at the data current shown in the part A (I41) at the data current (I42) shown in the part B.Therefore, the charge consumption amount that is used for stabistor pixel (E42) data current (I42) is same as or is similar to the required charge consumption amount of data current (I41) in the stabistor pixel (E41).
In a word, in luminescent device of the present invention, the slope of data current changes according to the cathode voltage of pixel, and any difference of brightness thus can not occur in design with between the pixel of sending same brightness light.Therefore, different with the prior art luminescent device, crosstalk phenomenon can not occur on the panel of this luminescent device.
Figure 11 is an a fourth embodiment in accordance with the invention, is preferably the figure of the luminescent device of organic electroluminescence device.This device comprises panel 1100, control circuit 1102, scan drive circuit 1104, discharge circuit 1106, pre-charge circuit 1108, data converting circuit 1110 and data drive circuit 1112.Except discharge circuit 1106, those of the element of this embodiment and the 3rd embodiment are identical.
Discharge circuit 1106 comprises switch (SW), number-Mo (D/A) converter 1120 and impact damper 1122.Switch (SW) was connected during discharge time.D/A converter 1120 will be transferred to impact damper 1122 corresponding to first sparking voltage of a level in a plurality of discharge level under the control of control circuit 1102.
Impact damper 1122 bufferings are preferably second sparking voltage of invariant from first sparking voltage of D/A converter 1120 transmission with output.As a result, during discharge time, the electric charge that is charged to data line (D1 to D4) is discharged to second sparking voltage.In other words, in the 4th embodiment, discharge circuit 1106 has the discharge level different with the 3rd embodiment.
In a word, in luminescent device of the present invention, the out of true ground data current identical with cathode voltage can be applied to data line (D1 to D4).In this case, control circuit 1102 compensates different data currents by a certain level that sparking voltage is adjusted into the unit.
Figure 12 is according to a fifth embodiment of the invention, for example is the figure of the luminescent device of organic electroluminescence device.This device comprises panel 1200, control circuit 1202, first scan drive circuit 1204, second scan drive circuit 1206, discharge circuit 1208, pre-charge circuit 1210, data converting circuit 1212 and data drive circuit 1214.Except first sweep circuit 1204 and second sweep circuit 1206, the element of this embodiment is identical with among second embodiment those.
First scan drive circuit 1204 offers first sweep signal some (S1 and the S3) in the sweep trace (S1 to S4) on a direction of panel 1200.Second scan drive circuit 1206 is transferred to second sweep signal those sweep traces (S2 and S4) of remainder on other direction of panel 1200.Identical with the 3rd embodiment, according to the cathode voltage among the 5th embodiment, data current is applied to data line (D1 to D4).The luminescence process of the 5th embodiment is similar to the 3rd embodiment's, and will omit the further detailed description of correlated process thus.
Aforesaid embodiment and advantage only are schematically and not to constitute restriction the present invention.This instruction can easily be applied to the device of other type.For example, the present invention can be used on the flexible display that is used for e-book, newspaper, magazine etc., dissimilar portable device such as mobile phone, MP3 player, notebook computer etc., vehicle sound applications, automobile navigation application, TV, monitor or needs the device of other type of display, or the present invention is formed above-mentioned device.
And description of the invention means illustrative, and does not limit the scope of claim.For those skilled in the art, a lot of changes, modifications and variations all are conspicuous.In the claims, the clause that device adds function means the structure described here that comprises as realizing described function, and not only comprises the equivalent of structure, but also comprises the structure of equivalent.

Claims (11)

1. the method for a driven for emitting lights device, each of described luminescent device all have the sub-pixel in the zone of data line crossing of being formed at and sweep trace, and this method comprises:
Video data is converted to translation data corresponding to sweep trace resistance;
To be applied to described data line corresponding to the data current of described translation data; With
Described data line is discharged to and the corresponding discharge level of described translation data.
2. method according to claim 1, the described data line that wherein discharges comprises:
Output is corresponding to the level voltage of described translation data; With
The level voltage that cushions described output is to produce sparking voltage.
3. method according to claim 1, wherein change described video data and comprise:
Calculating is corresponding to the sub-pixel cathode voltage of described video data; With
Produce the corresponding described translation data of cathode voltage with described calculating.
4. method according to claim 3, the translation data of wherein said generation is corresponding to the described cathode voltage that is stored in the data in the look-up table.
5. the electroluminescent device of a plurality of sub-pixels in the zone with the data line crossing of being formed at and sweep trace comprises:
Controller, it receives video data and exports a plurality of control signals from external source;
Scanner driver, its response sequentially is transferred to sweep signal described sweep trace from first control signal of described controller;
Data converter, its second control signal that is used to respond from described controller is converted to translation data with described video data, and exports described translation data;
Data driver, it is used for and will offers described data line with the corresponding data current of described translation data from described data converter; And
Discharger, the 3rd control signal that it is used to respond from described control will be charged to the charge discharge of described data line.
6. electroluminescent device according to claim 5 further comprises: the preliminary filling device, its response will offer described data line corresponding to the pre-charge current of described video data from the 4th control signal of described controller.
7. electroluminescent device according to claim 5, wherein said translation data corresponds respectively to the sub-pixel cathode voltage.
8. electroluminescent device according to claim 5, wherein said converter comprises:
Storer, it is used to store the resistance of described sweep trace;
Counter, it is used to use the described sub-pixel cathode voltage of resistance calculations of described sweep trace; And
Consult circuit, it comprises the look-up table that is used to store described translation data, and this consults circuit according to one that is selected by the cathode voltage of described counter calculating in the described translation data, and gives data drive circuit with selected data transmission.
9. electroluminescent device according to claim 8 wherein by in the resistance of described sweep trace each be multiply by and the corresponding data current of described video data, calculates each in the described cathode voltage.
10. electroluminescent device according to claim 5, wherein said discharger comprises:
Switch, its response is switched on or closes from the 3rd control signal of described controller; And
The discharge level circuit, it will be charged to the charge discharge of described data line to predetermined level when connecting described switch.
11. electroluminescent device according to claim 10, wherein said predetermined level is corresponding to the level of described translation data.
CN2006100041469A 2005-09-12 2006-02-20 Light-emitting device and method of driving the same Expired - Fee Related CN1933687B (en)

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