CN102054428A - Organic light-emitting diode (OLED) display as well as driving method and pixel unit thereof - Google Patents
Organic light-emitting diode (OLED) display as well as driving method and pixel unit thereof Download PDFInfo
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- CN102054428A CN102054428A CN2009102096879A CN200910209687A CN102054428A CN 102054428 A CN102054428 A CN 102054428A CN 2009102096879 A CN2009102096879 A CN 2009102096879A CN 200910209687 A CN200910209687 A CN 200910209687A CN 102054428 A CN102054428 A CN 102054428A
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Abstract
The invention relates to an organic light-emitting diode (OLED) display as well as a driving method and a pixel unit thereof. The OLED display comprises a pixel array consisting of a plurality of OLED pixel groups of different colors, such as red, green and blue. In the OLED display, the proportion of shortened light-emitting intervals of the OLED pixel groups of a specific color can be determined according to the color distribution of an image, thus, the service life of the OLED of the specific color can be effectively prolonged. In an embodiment, the pixel unit of the OLED display comprises an OLED, a switch and a driving circuit, and the switch is used to control the flow of the current output by the driving circuit to the OLED so as to achieve the effect of shortening the light-emitting intervals.
Description
Technical field
The present invention relates to a kind of organic light emitting diode display, particularly relate to the OLED display of the fluorescent lifetime of a kind of OLED that shortens particular color.
Background technology
Along with the Information of Science and Technology prosperity, various flat-panel screens technology are also paid attention to more, and (Organic Light Emitting Diode OLED) is one to Organic Light Emitting Diode.Organic Light Emitting Diode is a kind of autoluminescence technology, therefore do not need backlight (Backlight), having that the visual angle is wide, color contrast is effective, response speed reaches advantages such as cost soon, add can be made on the deflection base material, is the display technique that has future development.In the OLED display, each pixel normally is made up of the OLED of a plurality of different colours, and pixel receives the light that control different colours OLED after the drive signal sends respective intensities, produces suitable color by the mode of mixed light.
The OLED material is divided into two big classes, is respectively that (Small Molecule OLED is SMOLED) with macromolecule Organic Light Emitting Diode (Polymer Light-Emitting Diode), by the structure formation luminescence unit of multiple-level stack for micromolecule.See also shown in Figure 1ly, it illustrates the basic structure synoptic diagram of traditional OLED.Among the figure, the structure of OLED comprises a basic unit 11, an anode 12, one electric hole transport layer (HoleTransporting Layer, HTL) 13, one luminescent layer (Emission Layer, EML) 14, one electron transfer layer (Electron Transporting Layer, ETL) 15 and one negative electrode 16.Organic materials such as electricity hole transport layer 13, luminescent layer 14, electron transfer layer 15 are sandwiched in the sandwich construction between anode 12 and the negative electrode 16.When add suitable voltage 17 by the anodal 12 electric holes of injecting with combine at luminescent layer 14 by negative electrode 15 injected electrons, organic material that can stimulated luminescence layer 14 makes its generation light 18.Wherein, the proportional relation of the magnitude of current of OLED luminous quantity and inflow.
Because the principle of luminosity of OLED is to drive electronics to combine in organic material to excite bright dipping with electric hole, decay so luminescent material can wear out gradually with fluorescent lifetime, and the unit interval luminous intensity is high more, the speed of the aging decay of luminescent material is fast more.In addition, if the OLED display shows the image of being partial to certain particular color for a long time, also allow in the display OLED of particular color comparatively fast aging easily, be referred to as otherness decay (Differential Aging), its result makes whole OLED display forfeiture Presentation Function or its Presentation Function seriously influenced.Therefore, be a problem demanding prompt solution serviceable life that how effectively to prolong the OLED display.
This shows that above-mentioned existing organic light emitting diode display, its driving method and pixel cell thereof obviously still have inconvenience and defective, and demand urgently further being improved in product structure, manufacture method and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product and method do not have appropriate structure and method to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of new organic light emitting diode display, its driving method and pixel cell thereof, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to, overcome the defective that existing organic light emitting diode display, its driving method and pixel cell thereof exist, and provide a kind of new organic light emitting diode display, its driving method and pixel cell thereof, technical matters to be solved is to make it prolong organic light emitting diode display serviceable life, is very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.The driving method of a kind of organic light emitting diode display that proposes according to the present invention, one pixel cell of this organic light emitting diode display has an Organic Light Emitting Diode, one drive circuit, driving circuit is connected with OLED, and driving method comprises the following step.Receive the sweep signal that a data signal and comprises the picture frame interval by driving circuit., in the picture frame interval, produce a corresponding data signal and flow through an electric current of Organic Light Emitting Diode according to sweep signal by driving circuit.Receive a control signal, control signal goes out one first interval and one second interval with the picture frame section definition.According to this control signal, Control current makes the luminous intensity of Organic Light Emitting Diode in second interval be lower than luminous intensity in first interval.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Wherein, this driving method also comprises analyzes the image that organic light emitting diode display received, and determines the ratio value in first interval and second interval according to analysis result.
Wherein, when the number of pixel cell is a plurality of and pixel cell when being divided into a plurality of pixel group, the ratio value in first interval and second interval that the pixel cell of same pixel group is corresponding identical wherein.
Wherein, when the number of described pixel cell when being a plurality of, also comprise: the described pixel cell of selecting to be positioned at the corresponding particular color in a specific region; Control the luminous intensity of described selected described Organic Light Emitting Diode and be lower than luminous intensity in described first interval in described second interval.
The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of pixel cell that the present invention proposes, it comprises an Organic Light Emitting Diode, a switch and one drive circuit.Driving circuit is coupled with OLED and switch, and receives a sweep signal and a data signal that comprises a picture frame interval, and this driving circuit produces the electric current of a corresponding data signal to Organic Light Emitting Diode in the picture frame interval.Wherein, the switch Control current only the partial section between the luminous zone flow to Organic Light Emitting Diode.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Wherein, driving circuit comprises a first transistor, a transistor seconds and an electric capacity, the source electrode of the first transistor connects a data line to receive data signal, and the grid of the first transistor connects the one scan line to receive sweep signal, the source electrode of transistor seconds is connected with the anode of OLED, the grid of transistor seconds connects the drain electrode of the first transistor, the two ends of electric capacity connect the grid and the drain electrode of transistor seconds respectively, and the two ends of switch connect the drain electrode and one first voltage source of transistor seconds.
Wherein, driving circuit comprises a first transistor, one transistor seconds and an electric capacity, the source electrode of the first transistor connects a data line to receive data signal, and the grid of the first transistor connects the one scan line to receive sweep signal, the source electrode of transistor seconds is connected with the anode of OLED, the grid of transistor seconds connects the drain electrode of the first transistor, and the drain electrode of transistor seconds connects one first voltage source, the two ends of electric capacity connect the grid and first voltage source of transistor seconds respectively, and the two ends of switch connect the source electrode and second voltage source of transistor seconds.
The object of the invention to solve the technical problems realizes in addition more by the following technical solutions.According to the organic LED display device that the present invention proposes, it comprises a pel array, a signal processing unit, one scan driver element, a data driver element and a luminous controling unit.Pel array comprises a plurality of pixel cells with an Organic Light Emitting Diode, and a plurality of pixel cell is divided into a plurality of pixel groups.Signal processing unit receives an image and produces a plurality of data signals of corresponding a plurality of pixel cells respectively according to this image, and a plurality of luminous parameters of the corresponding a plurality of pixel groups of decision difference.Scan drive cell produces a plurality of sweep signals according to a plurality of luminous parameters and a picture frame cycle, and drives pel array according to a plurality of sweep signals.The data driver element drives a plurality of pixel cells according to a plurality of signal data.Luminous controling unit produces a plurality of control signals to control a plurality of pixel groups respectively in the fluorescent lifetime of picture frame in the cycle according to a plurality of luminous parameters.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Wherein, each sweep signal comprises a plurality of pulses, and the picture frame interval is between adjacent two pulses, and each luminous parameters is that pixel cell is in the picture frame interval between a luminous zone and a ratio value between not between the luminous zone.
Wherein, described a plurality of pixel cells are aforesaid pixel cell, and described a plurality of control signals are in order to control the switch of described a plurality of pixel cells.
By technique scheme, organic light emitting diode display of the present invention, its driving method and pixel cell thereof have following advantage and beneficial effect at least: by the present invention, come the electric current of control Driver Circuit output whether to flow to OLED by switch, to reach the effect between above-mentioned shortening luminous zone, can prolong organic light emitting diode display serviceable life.
In sum, the invention relates to a kind of organic light emitting diode display, its driving method and pixel cell thereof.Described organic light emitting diode display comprises a pel array, and it comprises Organic Light Emitting Diode (OLED) pixel group of a plurality of different colours, for example ruddiness, green glow and blue light.This organic light emitting diode display can be according to the COLOR COMPOSITION THROUGH DISTRIBUTION of image, and the OLED pixel group of decision particular color shortens the ratio between the luminous zone, the term of life that can prolong particular color OLED by this effectively.In one embodiment, the pixel cell of organic light emitting diode display comprises an OLED, a switch and one drive circuit, comes the electric current of control Driver Circuit output whether to flow to OLED by switch, to reach the effect between above-mentioned shortening luminous zone.The present invention has obvious improvement technically, and has tangible good effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 illustrates the basic structure synoptic diagram of traditional OLED.
Fig. 2 illustrates the first embodiment circuit diagram of the pixel-driving circuit of organic light emitting diode display of the present invention.
Fig. 3 illustrates first signal timing diagram of the pixel-driving circuit of Organic Light Emitting Diode of the present invention.
Fig. 4 illustrates the second embodiment circuit diagram of the pixel-driving circuit of Organic Light Emitting Diode of the present invention.
Fig. 5 illustrates the secondary signal sequential chart of the pixel-driving circuit of Organic Light Emitting Diode of the present invention.
Fig. 6 illustrates the 3rd signal timing diagram of the pixel-driving circuit of Organic Light Emitting Diode of the present invention.
Fig. 7 illustrates the 3rd embodiment circuit diagram of the pixel-driving circuit of Organic Light Emitting Diode of the present invention.
Fig. 8 illustrates first of organic LED display device of the present invention and implements block scheme.
Fig. 9 illustrates the local circuit synoptic diagram of organic LED display device of the present invention.
Figure 10 illustrates the enforcement signal timing diagram of organic LED display device of the present invention.
Figure 11 illustrates the circuit diagram of second embodiment of organic LED display device of the present invention.
Figure 12 illustrates the circuit diagram of the 3rd embodiment of organic LED display device of the present invention.
Figure 13 illustrates another enforcement signal timing diagram of organic LED display device of the present invention.
Figure 14 illustrates redness, green and the blue gray-scale distribution figure of image.
Figure 15 illustrates the process flow diagram of the driving method of organic light emitting diode display of the present invention.
Figure 16 illustrates the implementing procedure figure of the driving method of organic light emitting diode display of the present invention.
11: basic unit
12: anode
13: electric hole transport layer
14: luminescent layer
15: electron transfer layer
16: negative electrode
17: voltage
18: light
20,70: driving circuit
21: Organic Light Emitting Diode
22,32: switch
27,87: the picture frame interval
271,272: the interval
28: pulse
8: organic LED display device
81: pel array
811: pixel cell
812: the red pixel group
813: the green pixel group
814: blue pixel group
82: signal processing unit
821: image
822: data signal
823: luminous parameters
83: scan drive cell
831,831 (1)-831 (n): sweep signal
84: the data driver element
85: luminous controling unit
851,851 (R), 851 (G), 851 (B): control signal
86: voltage source
A1-A4: steps flow chart
B1-B8, B31, B32, B51: steps flow chart
C: electric capacity
C
R, C
G, C
B: control line
D1-D3: data line
S1-S4: sweep trace
T1-T6, T
R, T
G, T
B: transistor
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, embodiment, structure, method, step, feature and the effect thereof of organic light emitting diode display, its driving method and the pixel cell thereof that foundation the present invention is proposed, describe in detail as after.
See also shown in Figure 2ly, it is the first embodiment circuit diagram of the pixel-driving circuit of organic light emitting diode display of the present invention.Among the figure, pixel-driving circuit comprises one drive circuit 20, an Organic Light Emitting Diode (OLED) 21 and a switch 22.Driving circuit 20 comprises a transistor T 1, a transistor T 2 and a capacitor C, the source electrode of transistor T 1 connects a data line D1 to receive data signal DATA, and the grid of transistor T 1 connects one scan line S1 to receive sweep signal SCAN, the source electrode of transistor T 2 connects the anode of OLED 21, the drain electrode of transistor T 2 connects a voltage source V DD, the grid of transistor T 2 connects the drain electrode of transistor T 1, and an end of capacitor C connects the grid of transistor T 2, and the other end connects switch and voltage source V DD.
Please continue and consult Fig. 3, it is the signal timing diagram of the pixel-driving circuit of Organic Light Emitting Diode of the present invention.Among the figure, sweep signal S1 has a plurality of pulses 28, and adjacent two pulses 28 define a picture frame interval (frame) 27.When the grid of transistor T 1 receives pulse signal 28, the grid of transistor T 1 promptly transfers noble potential to by electronegative potential, and transistor T 1 promptly enters conducting state (Turn On), make between the source electrode of transistor T 1 and the drain electrode to path, thereby an end of capacitor C can receive data signal DATA and charges; When the grid for the treatment of transistor T 1 transferred electronegative potential to by noble potential, transistor T 1 entered between source electrode that closed condition (Turn Off) causes transistor T 1 and the drain electrode to opening circuit.The cross-pressure at capacitor C two ends can flow to the electric current I of OLED 21 in order to the source electrode of oxide-semiconductor control transistors T2
OledSize, and the luminous intensity of OLED 21 is relevant with the size of input current, therefore, sends the luminous intensity of corresponding data signal DATA by said process may command OLED 21.
Form a pel array in conjunction with a plurality of above-mentioned pixel cells, just can show an image.In the known skill, OLED 21 is in picture frame interval 27 and continues luminous state.In order effectively to prolong the service time of OLED21, to avoid in the pel array OLED 21 decay because of particular color to cause entire pixel array forfeiture Presentation Function or its Presentation Function seriously influenced, may command OLED 21 is only luminous in the part-time in picture frame interval 27.In this embodiment, switch 22 is controlled by control signal CONTROL shown in Figure 3, and when switch 22 conducting when control signal CONTROL is noble potential, voltage source V DD can provide electric current I
OledTo OLED 21; Otherwise when switch 22 opens circuit during for electronegative potential in control signal CONTROL, then voltage source V DD can't provide electric current I
OledTo OLED 21, then OLED 21 stops luminous.So, OLED 21 is that the interval 271 in picture frame interval 27 is luminous, and stops luminous interval 272.By this, just can under the pixel cell structure that does not change originally, control fluorescent lifetime in the picture frame interval of OLED effectively.
See also shown in Figure 4ly, it is the second embodiment circuit diagram of the pixel-driving circuit of Organic Light Emitting Diode of the present invention.Among the figure, second embodiment and the first embodiment difference are that switch 32 is connected in the anode of OLED 21, but not are arranged between voltage source V DD and the transistor T 2.Switch 32 is controlled by control signal CONTROL shown in Figure 5, when switch 32 conducting when control signal CONTROL is noble potential, form a low resistance path in parallel with OLED, cause this path of current direction and do not flow to OLED 21, then voltage source V DD can't provide electric current I
OledTo OLED 21, then OLED 21 stops luminous.
In a second embodiment, be to avoid I in the mode of a new route in parallel
OledFlow to OLED; Yet, be zero even the electric current that the deviser of display also uses this mode allow flows to OLED reduces, allow OLED reduce, also in protection scope of the present invention in interval 272 luminous intensities; Also or; if being the mode of a continuous impulse in interval 272, control signal CONTROL adjusts the luminous intensity of OLED in interval 272; as shown in Figure 6, allow OLED can under the pixel cell structure that does not change script, be reduced in the interval inner glow intensity of picture frame, then also in protection scope of the present invention.Control signal shown in Figure 6 also can be applicable to first embodiment.
See also shown in Figure 7ly, it is the 3rd an embodiment circuit diagram of the pixel-driving circuit of Organic Light Emitting Diode of the present invention.Among the figure, the 3rd embodiment and first embodiment or the second embodiment difference are that driving circuit 70 more comprises a current replication circuit.In this embodiment, current replication circuit is made up of transistor T 3, T4, T5 and T6, in order to the electric current I of replication stream through data line D1
Data, that is I
OledWith I
DataEquate, so can reduce I
OledTo the susceptibility of transistor characteristic, and then improve stability because of manufacturing process (being processing procedure) drift change.Switch 22 is connected between voltage source V DD and the driving circuit 70, and its principle of operation is identical with first embodiment, does not repeat them here.In addition, switch 22 also can connect anode and the voltage source V DD of OLED 21, and principle of operation is identical with second embodiment, does not repeat them here.
See also Fig. 8 and shown in Figure 9, it illustrates first of organic LED display device of the present invention and implements block scheme and local circuit synoptic diagram.Among the figure, organic LED display device 8 comprises a pel array 81, a signal processing unit 82, one scan driver element 83, a data driver element 84, a luminous controling unit 85 and a voltage source 86.Pel array 81 comprises the pixel cell 811 of a plurality of OLED of having, and a plurality of pixel cell 811 is divided into a plurality of pixel groups.Wherein, a plurality of pixel groups are preferably the pixel group that sends different colours light; In addition, the arrangement mode of a plurality of pixel groups is preferably row and arranges or be listed as arrangement.For example at this embodiment, pel array 81 comprises red pixel group 812, green pixel group 813 and blue pixel group 814, and the pixel cell under it comprises a red OLED, a green OLED and a blue OLED respectively.Arrange in same delegation and send with color pixel, for example the pixel column of a plurality of burn reds is formed red pixel group 812, and the pixel column of a plurality of glow greens is formed green pixel group 813.Seeing also Fig. 9, illustrate among the figure with the formed pel array 81 of a plurality of pixel cell shown in Figure 2 first embodiment circuit, is a transistor T and concentrate with the switch of the pixel cell 811 of delegation
R, T
BOr T
GRealize and do not influence its effect.Transistor T
R, T
BAnd T
GGrid connect control line C respectively
R, C
BAnd C
G,, whether flow to pixel cell 811 by the noble potential of control signal 851 or the electric current of electronegative potential decision voltage source 86 outputs to receive corresponding control signal 851.
Signal processing unit 82 receives an image 821 and produces a plurality of data signals 822 of corresponding a plurality of pixel cells 811 respectively according to this image 821.In this embodiment, signal processing unit 82 produces red data signal, green data signal and the blue data signal of image 821.Signal processing unit 82 decisions are a plurality of luminous parameters 823 of corresponding a plurality of pixel group 812-814 respectively.Scan drive cell 83 produces a plurality of sweep signals 831 according to a plurality of luminous parameters 823 and a picture frame cycle 87, and drives pel array 81 according to a plurality of sweep signals 831.Data driver element 84 drives a plurality of pixel cells 811 according to a plurality of data signals 822.
Each sweep signal 831 has a plurality of pulses, adjacent two pulses define the picture frame cycle 87, in Fig. 9, connect same sweep trace to receive sweep signal 831 with the pixel cell 811 of delegation, connect sweep trace S1-S4 respectively as first pixel cell 811 that walks to fourth line among the figure; And the pixel cell 811 of same row connects same data line, connects data line D1-D3 respectively as first row to the tertial pixel cell 811 among the figure.When pulse appears in sweep signal 831, promptly transfer noble potential to by electronegative potential, then pixel cell 811 is in the state that can receive data signal, and the data signal 822 on the data line D1-D3 just can be stored in pixel cell 811.The pulse of a plurality of sweep signals 831 differs from one another the step, but the pixel cell 811 of sequential start different lines, and data driver element 84 changes the information signal along with the pulse change of sweep signal 831, so a plurality of pixel cells in the pel array 81 811 can be stored different data.
Wherein, scan drive cell 83 can be adjusted the position of pulse in the sweep signal 831 according to luminous parameters 823, please continue and consult Figure 10, and it illustrates the enforcement signal timing diagram of organic LED display device of the present invention.Among the figure, 831 (1), 831 (2)-831 (n) is for being respectively applied for the 1st row, the capable sweep signal of the 2nd row-Di n; And 851 (R), 851 (G) and 851 (B) are respectively the control signal that is used for ruddiness, green glow and blue light pixel group.Among the figure, control signal 851 (R) is 85% noble potential (between the luminous zone) and 15% electronegative potential (between non-light-emitting area) in corresponding picture frame interval; Control signal 851 (G) is 80% noble potential (between the luminous zone) and 20% electronegative potential (between non-light-emitting area) in corresponding picture frame interval; Control signal 851 (B) is 60% noble potential (between the luminous zone) and 40% electronegative potential (between non-light-emitting area) in corresponding picture frame interval.Scan drive cell 83 can shorten the recurrent interval between a plurality of sweep signals 831 according to the signal characteristic of above-mentioned a plurality of control signals 851, and the pulse of scanning enable signal 831 can come across between the luminous zone.By this, pairing second interval of a plurality of pixel columns of pel array is synchronous; Similarly, if the pixel group of pel array is formed with a plurality of pixel column, also make a plurality of pixel columns pairing second of pel array interval in an identical manner for synchronously.
See also shown in Figure 11ly, it illustrates the circuit diagram of second embodiment of organic LED display device of the present invention.Among the figure, this second embodiment and the first embodiment difference are to be arranged at same row with color pixel unit 811, and principle of operation is identical with first embodiment, does not repeat them here.
See also shown in Figure 12ly, it illustrates the circuit diagram of the 3rd embodiment of organic LED display device of the present invention.Among the figure, this 3rd embodiment is different with the structure that preceding two embodiment differences are pixel cell, and circuit shown in Figure 12 is constituted with pixel cell shown in Figure 4, and principle of operation had been described in preamble, did not repeat them here.
See also shown in Figure 13, its illustrate organic LED display device of the present invention another implement signal timing diagram.Among the figure, the sequential chart difference of sequential chart and Figure 10 is that control signal 851 (B) has a plurality of pulses between non-light-emitting area, can adjust the blue light emitting effect of this display device.
The luminous parameters of each pixel group determines after can analyzing presentation content by signal processing unit 82.Owing to shorten the function of the fluorescent lifetime of OLED 21 in the picture frame interval and be for fear of the OLED 21 of particular color because excessively luminous and decay fast, therefore signal processing unit 82 can be analyzed the gray-scale distribution of different colours in the image 821, when this image can surpass a threshold value to a kind of use amount of color, then signal processing unit 82 is set between picture frame interval 87 interior luminous zones or the ratio value between non-light-emitting area, as luminous parameters 823, and scan drive cell 83 and data driver element 84 are done corresponding adjustment according to this luminous parameters 823 with this ratio value.See also shown in Figure 14ly, it illustrates in the image red, green and blue gray-scale distribution figure.Can find out among the figure, the green pixel that surpasses 128 GTG values in this image outnumbers 50%, and the blue pixel that surpasses 128 GTG values outnumbers 50%, this need drive green glow OLED when analyzing this image of expression demonstration and blue light OLED sends higher light intensity, can allow these two kinds of color OLED luminescence units seriously consume, quicken the decay life-span.So signal processing unit 82 is set corresponding green pixel group and blue pixel group's luminous parameters 87 according to this analysis result, start to shorten the function of OLED fluorescent lifetime, control signal 851 (G) and 851 (B) are had in the picture frame interval between 20% and 40% non-light-emitting area as shown in figure 10.Owing to be weak point than ruddiness OLED or green glow OLED the serviceable life of blue light OLED at present, so control signal 851 (B) has between long non-light-emitting area.
In addition, whether the startup of the function of above-mentioned shortening OLED fluorescent lifetime also can be decided by the setting pattern and the presentation content of user's input.Signal processing unit 82 can be analyzed presentation content, judges red in the presentation content, green and blue shared respectively ratio, and whether starts this function according to the question blank of a recording image content and the corresponding relation of the pattern of setting with decision.As shown in Table 1, if it is long-acting pattern that the user sets the OLED display device, the expression user wishes to prolong the serviceable life of display, so in Table 1, if red components in proportions surpasses 60% in the image, or green components in proportions surpasses 30%, or blue components in proportions surpasses 10%, becomes the function that starts above-mentioned shortening OLED fluorescent lifetime.Decision can decide luminous parameters according to the gray-scale distribution of each color after starting.Because the serviceable life of present blue light OLED is the shortest, so the startup value of table one Smalt is also minimum.
Table one
In addition, in the above-described embodiments, shorten the influence of OLED fluorescent lifetime to user's visual experience in order to reduce, signal processing unit 82 can compensate image 821, moderately improve the brightness of particular color in the image, for example adjust the blue gamma curve or the green gamma curve of image 821.
See also shown in Figure 15ly, it illustrates the process flow diagram of the driving method of organic light emitting diode display of the present invention.One pixel cell of organic light emitting diode display has an Organic Light Emitting Diode, one drive circuit, and described driving circuit connects described Organic Light Emitting Diode.Among the figure, receive the sweep signal that a data signal and comprises a picture frame interval by driving circuit in steps A 1.In steps A 2 by driving circuit according to sweep signal, in the picture frame interval, produce a corresponding data signal and flow through an electric current of Organic Light Emitting Diode.Receive a control signal in steps A 3, control signal goes out one first interval and one second interval with described picture frame section definition.Controlling described electric current in steps A 4 according to described control signal makes the luminous intensity of Organic Light Emitting Diode in second interval be lower than luminous intensity in described first interval.
See also shown in Figure 16ly, it illustrates the implementing procedure figure of the driving method of organic light emitting diode display of the present invention.Among the figure, this implementing procedure comprises the following step.At step B1, receive an image, analyze the RGB gray-scale distribution of this image at step B2, judge whether to start the mechanism that shortens fluorescent lifetime according to the RGB gray-scale distribution, if not, execution in step B31 then; If, execution in step B4 then.In step B31, produce a plurality of sweep signals, and produce a plurality of data signals according to this image, then luminous at step B32 a plurality of pixel cells that a little sweep signals and data signal drive in the pel array according to this, to show this image.
At step B4, the luminous parameters of decision ruddiness, green glow and blue light pixel group, for example ratio between the luminous zone in the picture frame interval, or non-light-emitting area ratio.At step B5, judge whether and to compensate image according to the RGB gray-scale distribution.If not, execution in step B6 then; If then read a RGB compensation look-up-table or carry out converse routine of the same colour, to change the color of this image in step 51.After the conversion, execution in step B6.At step B6,, and produce a plurality of data signals according to original image or through the image of conversion according to interval a plurality of sweep signals and the control signal of producing of luminous parameters and picture frame.At step B7, luminous according to a plurality of pixel cells that these a little sweep signals and data signal drive in the pel array, at step B8, whether luminous in the picture frame interval according to the OLED in the control signal control pixel cell.
Because the pixel cell of display is to arrange with array way, if only there is the specific region may cause the OLED of particular color to cause serious consumption in the image, then can carry out the action of above-mentioned shortening fluorescent lifetime by the pixel cell of a corresponding particular color in the above-mentioned mechanism control specific region.And principle of operation is similar to foregoing embodiment, does not repeat them here.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1. the driving method of an organic light emitting diode display, one pixel cell of described organic light emitting diode display has an Organic Light Emitting Diode, one drive circuit, described driving circuit connects described Organic Light Emitting Diode, it is characterized in that described driving method comprises:
Receive an one scan signal and a data signal by described driving circuit, described sweep signal comprises a picture frame interval;
, in described picture frame interval, produce a corresponding described data signal and flow through an electric current of described Organic Light Emitting Diode according to described sweep signal by described driving circuit;
Receive a control signal, described control signal goes out one first interval and one second interval with described picture frame section definition; And
According to described control signal, control described electric current and make the luminous intensity of described Organic Light Emitting Diode be lower than luminous intensity in described first interval in described second interval.
2. driving method as claimed in claim 1 is characterized in that also comprising:
Analyze the image that described organic light emitting diode display receives;
Determine the ratio value in described first interval and described second interval according to analysis result.
3. driving method as claimed in claim 1, it is characterized in that number when described pixel cell is a plurality of and described a plurality of pixel cells when being divided into a plurality of pixel group, the ratio value in described first interval or described second interval that the pixel cell of wherein said same pixel group is corresponding identical.
4. driving method as claimed in claim 1 is characterized in that also comprising when the number of described pixel cell when being a plurality of:
Selection is positioned at the described pixel cell of the corresponding particular color in a specific region;
Control the luminous intensity of described selected described Organic Light Emitting Diode and be lower than luminous intensity in described first interval in described second interval.
5. pixel cell is characterized in that comprising:
One Organic Light Emitting Diode;
One switch; And
One drive circuit, couple described Organic Light Emitting Diode and described switch, and receive and to comprise the one scan signal in a picture frame interval and to receive a data signal, described driving circuit produces corresponding described data signal in described picture frame interval a electric current is described Organic Light Emitting Diode extremely;
Wherein, described switch control described electric current only the partial section between described luminous zone flow to described Organic Light Emitting Diode.
6. pixel cell as claimed in claim 5, it is characterized in that wherein said driving circuit comprises a first transistor, one transistor seconds and an electric capacity, the source electrode of described the first transistor connects a data line to receive described data signal, and the grid of described the first transistor connects the one scan line to receive described sweep signal, the source electrode of described transistor seconds connects the anode of described Organic Light Emitting Diode, the grid of described transistor seconds connects the drain electrode of described the first transistor, the two ends of described electric capacity connect the grid and the drain electrode of described transistor seconds respectively, and the two ends of described switch connect the drain electrode and one first voltage source of described transistor seconds.
7. pixel cell as claimed in claim 5, it is characterized in that wherein said driving circuit comprises a first transistor, one transistor seconds and an electric capacity, the source electrode of described the first transistor connects a data line to receive described data signal, and the grid of described the first transistor connects the one scan line to receive described sweep signal, the source electrode of described transistor seconds connects the anode of described Organic Light Emitting Diode, the grid of described transistor seconds connects the drain electrode of described the first transistor, and the drain electrode of described transistor seconds connects one first voltage source, the two ends of described electric capacity connect the grid and described first voltage source of described transistor seconds respectively, and the two ends of described switch connect the source electrode and described second voltage source of described transistor seconds.
8. organic LED display device is characterized in that comprising:
One pel array comprises a plurality of pixel cells with an Organic Light Emitting Diode, and described a plurality of pixel cell is divided into a plurality of pixel groups;
One signal processing unit receives an image and produces a plurality of data signals of respectively corresponding described a plurality of pixel cells according to described image, and determines a plurality of luminous parameters of respectively corresponding described a plurality of pixel groups;
The one scan driver element produces a plurality of sweep signals according to described a plurality of luminous parameters and a picture frame cycle, and drives described pel array according to described a plurality of sweep signals;
One data driver element drives described a plurality of pixel cell according to described a plurality of signal data; And
One luminous controling unit produces a plurality of control signals to control described a plurality of pixel group respectively at the fluorescent lifetime of described picture frame in the cycle according to described a plurality of luminous parameters.
9. organic LED display device as claimed in claim 8, it is characterized in that wherein each described a plurality of sweep signal comprises a plurality of pulses, described picture frame interval is between adjacent two pulses, and each described luminous parameters is that described pixel cell is in described picture frame interval between a luminous zone or a ratio value between the luminous zone not.
10. organic LED display device as claimed in claim 8 is characterized in that wherein said a plurality of pixel cell is each described pixel cell in the claim 5 to 7, and described a plurality of control signals are in order to control the switch of described a plurality of pixel cells.
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| CN2009102096879A CN102054428A (en) | 2009-11-05 | 2009-11-05 | Organic light-emitting diode (OLED) display as well as driving method and pixel unit thereof |
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| CN2009102096879A CN102054428A (en) | 2009-11-05 | 2009-11-05 | Organic light-emitting diode (OLED) display as well as driving method and pixel unit thereof |
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| CN102054428A true CN102054428A (en) | 2011-05-11 |
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Application publication date: 20110511 |