CN100447842C - Organic electro luminescence display device and driving method thereof - Google Patents
Organic electro luminescence display device and driving method thereof Download PDFInfo
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- CN100447842C CN100447842C CNB200510074742XA CN200510074742A CN100447842C CN 100447842 C CN100447842 C CN 100447842C CN B200510074742X A CNB200510074742X A CN B200510074742XA CN 200510074742 A CN200510074742 A CN 200510074742A CN 100447842 C CN100447842 C CN 100447842C
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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
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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
- 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
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
Abstract
The present invention relates to an organic electro luminescence display device using a pre-charge, and a driving method thereof. An organic electro luminescence display device according to an embodiment of the present invention includes: a display panel where a plurality of data lines cross a plurality of gate lines, and electro luminescence elements are arranged at intersections thereof; a pre-charge driver to select a current which is different in accordance with a gray level of data and to supply the pre-charge current to the electro luminescence elements through the data line; and a data driver to supply a data to the electro luminescence elements which are charged with the pre-charge current.
Description
The application requires the korean patent application Nos.P2004-39748 that submits on June 1st, 2004 and on June 9th, 2004 and the rights and interests of P2004-42115, and it is comprised fully and be incorporated herein by reference at this.
Technical field
The present invention relates to electroluminescence display device, and more specifically relate to precharge organic electro-luminescence display device of use and driving method thereof.
Background technology
Recently, developed multiple flat-panel monitor, it can reduce weight and size that it is the cathode-ray tube CRT shortcoming.This flat-panel monitor comprises LCD LCD, Field Emission Display FED, Plasmia indicating panel PDP, electroluminescence EL display device etc.
The structure of PDP is relative with manufacture process simple, and is therefore useful aspect the manufacturing giant-screen, relative with brightness low but the shortcoming of its maximum is luminescence efficiency, and energy consumption is very high.
LCD mainly increases as display device and its demand of notebook computer.But therefore LCD is difficult to manufacture big screen by the semiconductor technology manufacturing.And LCD is not a light emitting device, and it needs independent light source, so its shortcoming is that energy consumption is very high because needing light source.In addition, the shortcoming of LCD is that its visual angle is very narrow, and because such as optical device such as polaroid, prismatic lens, scatter plates, its light loss is very big.
The EL display device generally speaking is classified as inorganic EL display device and organic EL display apparatus, and its advantage is that its response speed is very fast and luminescence efficiency, brightness and visual angle are very big.This EL display device can pass through the voltage of about 10V with banks up to ten thousand/cubic meter (cd/m
3) high brightness display frame, and it has been applied on normally used most of EL display device.
As shown in Figure 1, the unit elements of organic EL display apparatus comprises: the anode 2 that is formed on glass substrate 1 by transparent conductor material; Hole injection layer 3; The luminescent layer 4 that forms by organic material and by having the negative electrode 5 that the metal of the low work content (low work function) of deposition thereon forms.If electric field is added between anode 2 and the negative electrode 5, hole in hole injection layer 3 and the electronics in metal go to luminescent layer 4 and are combined with each other in luminescent layer 4.Then, the fluorescent material in the luminescent layer 4 be excited and by transition to produce visible light.At this moment, brightness is directly proportional with electric current between anode 2 and negative electrode 5.
Organic EL display apparatus is divided into passive type and Source Type is arranged.
Fig. 2 is a circuit diagram of representing the part of passive type organic EL display apparatus equivalently, and Fig. 3 is the sweep signal of expression passive type organic EL display apparatus and the waveform of data signal waveforms.
With reference to figure 2 and 3, passive type EL display device comprises: a plurality of data line D1-D3 intersected with each other and a plurality of sweep trace S1-S3; And the organic EL OLED of the formation of the point of crossing between data line D1-D3 and sweep trace S1-S3.
Data line D1-D3 is connected to the anode of organic EL OLED so that data current Id to be provided the anode to organic EL OLED.
The negative electrode that sweep trace S1-S3 is connected to organic EL OLED is to provide the negative electrode to organic EL OLED with the synchronous scanning impulse SPl-SP3 of data current Id.
In the display cycle DT when application scanning pulse SPl-SP3, the emission light of organic EL OLED to be directly proportional with the electric current that between anode and negative electrode, flows.
In the response time RT by the resistive component of data line D1-D3 and the capacitance delays in organic EL OLED, with the organic EL OLED of current charges organic EL display apparatus, therefore the problem that exists is that response speed and brightness are low.In order to compensate the low-response speed of organic EL OLED, have a kind of trend recently, promptly provide precharge cycle PCHA as non-display cycle between display cycle DT, and during precharge cycle PCHA precharge organic EL OLED.But even the precharge organic EL display apparatus, the problem of existence is to prolong with low gray level the response time RT of organic EL OLED, as shown in Figure 4.
In addition, in the driving method of precharge organic EL display apparatus, but the problem of existence is that response speed is fast brings the organic EL OLED that overcharges by the mistake of high grade grey level.This is because pre-charge current Ipre is fixed to the value of the gray level * precharge constant " 10 " of data, and does not consider the gray level of data, as shown in Figure 5.With the electric current I oled of the organic EL OLED of fixing pre-charge current Ipre charging along with the increase of gray level increases exponentially, as shown in Figure 6.As a result, if organic EL OLED drives by pre-charge method, its brightness does not change linearly, but increases exponentially along with the increase of gray level, therefore has the low problem of gray level representation ability.
In addition, the problem that the pre-charge method of most of current uses has be energy consumption high and in low grey level range undercurrent make that with to organic EL OLED precharge the gray level representation ability is low in low gray level.
Summary of the invention
Therefore, the purpose of this invention is to provide the organic electro-luminescence display device and the driving method thereof that do not overcharge, its response speed is very fast and the gray level representation ability is very high.
In addition, another object of the present invention provides low energy consumption and is hanging down organic electro-luminescence display device and the driving method thereof that gray level has high gray level representation ability.
In order to realize these and other objects of the present invention, organic electro-luminescence display device according to the solution of the present invention comprises: display panel, it has many data lines, the multi-strip scanning line that intersects with many data lines, and a plurality of electroluminescent cells of being provided with of described many data lines and multi-strip scanning line place intersected with each other; Question blank, it deposits pre-charge current data, and wherein these pre-charge current data are indicated the magnitude of current of pre-charge current, and increase the magnitude of current index minimizing of pre-charge current along with gray level; Controller, the gray level that it judges data reads the pre-charge current data corresponding to the gray level of data, and according to pre-charge current Data Control pre-charge driver; Pre-charge driver, its gray level according to these data is selected pre-charge current, and provides pre-charge current to arrive described a plurality of electroluminescent cell by many data lines; And data driver, it provides these data to described a plurality of electroluminescent cells.
Organic electro-luminescence display device further comprises: scanner driver, it provides scanning impulse with data sync to the multi-strip scanning line.
In organic electro-luminescence display device, pre-charge driver comprises: a plurality of current sources, and its current value differs from one another; Select part, its select a plurality of current sources any one as pre-charge current; And first switching device, it provides pre-charge current to data line in the non-display cycle.
In organic electro-luminescence display device, data driver comprises: the second switch device provides data current to data line in its display cycle after the non-display cycle.
In organic electro-luminescence display device, pre-charge current has current value identical in comprising the grey level range of a plurality of gray levels, and the different current values in the gray level outside this grey level range.
According to a further aspect in the invention, a kind of driving method of organic electro-luminescence display device, this equipment has many data lines, the multi-strip scanning line that intersects with described many data lines, and a plurality of electroluminescent cells of arranging at described many data lines and multi-strip scanning line place intersected with each other, the method comprising the steps of: pre-charge current data of the magnitude of current of indication pre-charge current are provided, and increase the magnitude of current index minimizing of pre-charge current along with gray level; Judge the gray level of data, read pre-charge current data corresponding to the gray level of data, and according to this pre-charge current Data Control pre-charge current; Gray level according to these data is selected pre-charge current; Provide described pre-charge current to described a plurality of electroluminescent cells by many data lines; Provide these data to described a plurality of electroluminescent cells.
Driving method further comprises step: provide scanning impulse with data sync to sweep trace.
In driving method, select the step of pre-charge current to comprise step: any one that select a plurality of current sources that its current value differs from one another is as pre-charge current; With in the non-display cycle, provide pre-charge current to data line.
In this driving method, the step that provides data to described electroluminescent cell comprises step; Display cycle after the non-display cycle, provide data to data line.
The organic electro-luminescence display device of a scheme again according to the present invention, it comprises: display panel, it has a plurality of data lines; The gray level judgment part, the gray level of its judgment data; And pre-charge driver, it if the gray level of data is the gray levels that are lower than the benchmark gray level (it is lower than maximum gray scale) of appointment, then produces charge or discharge in the non-scan period according to the gray level judged result of gray level judgment part in data line.
Organic electro-luminescence display device comprises that further data comparator is with more adjacent data.
In organic electro-luminescence display device, gray level judged result according to the gray level judgment part, if the gray level of data is higher than the benchmark gray level, and according to the comparative result of data comparator, if data are higher than past data, then pre-charge driver has the data line in non-scan period charging.
In organic electro-luminescence display device, gray level judged result according to the gray level judgment part, if the gray level of data is higher than the benchmark gray level, and according to the comparative result of data comparator, if data are lower than past data, then pre-charge driver produces discharge in the non-scan period in data line.
According to a scheme more of the present invention, the driving method with organic electro-luminescence display device of a plurality of data lines comprises step: the gray level of judgment data; And,, then in data line, produce charge or discharge in the non-scan period if the gray level of data is to be lower than the gray level of specifying benchmark gray level (it is lower than maximum gray scale) according to the gray level judged result.
This driving method further comprises more adjacent data.
This driving method further comprises step: according to the gray level judged result, if the gray level of data is higher than the benchmark gray level, and according to the data comparative result, if data are higher than previous data, then produce charging in the non-scan period in data line.
This driving method further comprises step: according to the gray level judged result, if the gray level of data is higher than the benchmark gray level, and according to the data comparative result, if data are lower than past data, then produce discharge in the non-scan period in data line.
Description of drawings
Can more clear these and other objects of the present invention by detailed description below in conjunction with the embodiments of the invention of accompanying drawing.
Fig. 1 is the sectional view of unit elements of the organic electro-luminescence display device of schematic representation prior art;
Fig. 2 is a view of representing the part of the array in the passive organic electroluminescent display device equivalently;
Fig. 3 is the oscillogram of the delay of response time of producing in the driving method that is illustrated in the organic electro-luminescence display device of prior art;
Fig. 4 is the oscillogram of the precharge driving method of expression prior art;
Fig. 5 is the view that expression is applied to the pre-charge current of pre-charge method as shown in Figure 4;
Fig. 6 is the view of the deterioration of the gray level representation ability of representing that precharge driving method as shown in Figure 4 produces;
Fig. 7 is the block diagram of expression according to the organic electro-luminescence display device of first embodiment of the invention;
Fig. 8 be expression according to first embodiment of the invention, be applied to the pre-charge current of organic electro-luminescence display device and the view of method thereof;
Fig. 9 is a circuit diagram of representing pre-charge driver as shown in Figure 7 in detail;
Figure 10 be represent equivalently as shown in Figure 7 display panel and the circuit diagram of driving circuit;
Figure 11 is what to explain according to first embodiment of the invention, the oscillogram of the driving method of organic electro-luminescence display device;
Figure 12 is the block diagram of expression according to the organic electro-luminescence display device of second embodiment of the invention;
Figure 13 is a circuit diagram of representing pre-charge driver as shown in figure 12 in detail; And
Figure 14 is the oscillogram of explanation according to the driving method of the organic electro-luminescence display device of second embodiment of the invention.
Embodiment
Below will be in detail with reference to the preferred embodiments of the present invention, the example shown in the drawings.
Hereinafter, will describe the preferred embodiments of the present invention in detail with reference to figure 7-14.
With reference to figure 7, comprise according to the organic EL display apparatus of the first embodiment of the present invention: display panel 64, wherein arrange m * n organic EL OLED with matrix-type; Data driver 61, it produces data current; Pre-charge driver 62, it produces pre-charge current; Scanner driver 63, it produces and the synchronous scanning impulse of data current; And precharge/recording controller 65, it is according to question blank 66 control pre-charge driver 62.
In display panel 64, m data line D1-Dm and n sweep trace S1-Sn, and at its point of crossing layout organic EL OLED.
Under the control of precharge/recording controller 65, pre-charge driver 62 makes the pre-charge current difference according to the gray level of data RGB, and provides pre-charge current to data line D1-Dm before data current.
Precharge/recording controller 65 is judged the gray-scale value of digital of digital video data RGB, and reads the pre-charge current data corresponding to gray-scale value in question blank.And, precharge/recording controller 65 receives vertical/horizontal synchronizing signal and clock signal (not shown), optionally produce control signal SEL1, SEL2 corresponding to the pre-charge current data, and by using control signal SEL1, SEL2 to control pre-charge driver 62.Here, the first control signal SEL1 is the scan period before the display cycle, just, produces the amount with the selection pre-charge current during the precharge cycle, and the control signal of pre-charge current to data line D1-Dm is provided during precharge cycle.And the second control signal SEL2 was used in the scan period, and the control signal of data current to data line D1-Dm was provided during the display cycle just.
In question blank 66, deposit pre-charge current data corresponding to each gray level of digital of digital video data RGB.This question blank 66 is stored in the read only memory ROM.The pre-charge current data of depositing in question blank have the value that is divided into fixing grey level range, and the ratio that reduces with the volume index that increases pre-charge current along with gray level is provided with this value, as shown in Figure 8.
In Fig. 7, pre-charge driver 62 and precharge/recording controller 65 can be integrated in the chip, and question blank 66 can also be integrated with pre-charge driver 62 and precharge/recording controller 65.
Along with gray level increases the basic as follows of the fact that the volume index of pre-charge current reduces.In order to be increased in the gray level representation ability in the whole gray level scope, under the situation that the pre-charge current that needs under the situation that gray level changes in low grey level range should change in higher intermediate grey scales or high grade grey level scope than gray level, increase with higher ratio.For example, the gray level of supposing high-high brightness be 100% and the gray-scale value of data change with identical gray level difference, changing to the preliminary filling electricity ratio that needs under 50% the situation in gray level from 10%, to change to the preliminary filling electric weight that needs under 90% the situation in gray level from 50% much bigger.
As shown in Figure 8, by the pre-charge current data of in question blank, depositing, suppose that high-high brightness is 100%, in precharge/recording controller 65, before data current, if the gray level of digital of digital video data RGB is 10%, the amount of the pre-charge current Ipre that charges in organic EL OLED is 50 times of the benchmark pre-charge current that sets in advance, but increase along with gray level, if its index reduces to the gray level of digital of digital video data RGB and reduces to 10%, be 10 times of benchmark pre-charge current.
Fig. 9 is shown specifically pre-charge driver 62.
With reference to figure 9, pre-charge driver 62 comprises: select part 71, to select the magnitude of current of pre-charge current Ipre; The first switching device 72A is to provide pre-charge current Ipre to data line D1; And second switch device 72B, to provide data current Id1 to data line D1.Second switch device 72B can be included in the data driver 61.
In response to selecting signal SEL1 from first of precharge/recording controller 65, electric current select k (k is the positive integer greater than 2) current source I1, I2 that part 71 differs from one another from the magnitude of current ..., Ik any one in select pre-charge current Ipre, and provide selected pre-charge current Ipre to the first switching device 72A.
In response to selecting signal SEL1 from first of precharge/recording controller 65, during the non-display cycle before the display cycle, the first switching device 72A provides by the pre-charge current Ipre that selects part 71 to select to data line D1.
In response to the selection signal from precharge/recording controller 65, during the scan period, just the display cycle, second switch device 72B provides from data driver 61 data current Id1 to data line D1.
Figure 10 is a circuit diagram of representing as shown in Figure 7 driving circuit, signal wire D1-Dm, S1-Sn and organic EL OLED equivalently.
With reference to Figure 10, benchmark numeral " R " is the stray capacitance of data line D1-Dm, and " CAP " is the stray capacitance of organic EL OLED.And " 61A " is included in constant current source in the data driver 61 to produce data current." 63A " is the switching device that is included in the scanner driver 63, and it is in the display cycle, just, scan period, use the negative electrode of ground voltage GND to organic EL OLED, and in the non-display cycle, just, the non-scan period provides the positive scanning bias voltage negative electrode to organic EL OLED." VDD " is the high potential driving voltage that is added to constant current source, and " VSS " be in the non-display cycle, and just, the non-scan period is added to the scanning bias voltage of the negative electrode of organic EL OLED.
Below in conjunction with Figure 10 and 11 driving methods of describing according to the organic EL display apparatus of first embodiment of the invention.
With reference to Figure 10 and 11, during the precharge cycle PCHA before the display cycle DT, the first switching device 72A of pre-charge driver 62 is switched on, to provide the pre-charge current Ipre that is selected according to the gray level of digital of digital video data RGB by precharge/recording controller 65 to data line D1-Dm.Then, during precharge cycle PCHA, increase the pre-charge current Ipre charging organic EL OLED that its magnitude of current index reduces with gray level, as shown in Figure 8 along with data.When comparing with the pre-charge method of prior art, pre-charge current Ipre makes in low gray level with bigger magnitude of current precharge organic EL OLED, reducing response time RT, and can not overcharged with the precharge of less current amount by overshoot at high grade grey level.
After precharge cycle PCHA, in display cycle DT, second switch device 72B is switched on, but the first switching device 72A is disconnected.Then, during display cycle DT, the second switch device 72B of data current Id1 by pre-charge driver 61 is provided to data line D1-Dm.Id1 is synchronous with data current, and the switching device 63A of scanner driver 63 sequentially provides the scanning impulse of ground voltage GND to sweep trace S1-Sm.During display cycle DT, when data current Id1 by positive biasing when anode flows to negative electrode, organic EL OLED is luminous.
As shown in figure 11, pre-charge current Ipre is added to organic EL OLED with the optimum current amount in the whole gray level scope, therefore grey scale linear changes in the whole gray level scope, to improve the gray level representation ability of each gray level.
On the other hand, according to the organic EL display apparatus and the driving method thereof of first embodiment of the invention,, also can be applied to any known organic electro-luminescence display device that Source Type is arranged even explain with embodiment based on passive way.
With reference to Figure 12, organic EL display apparatus according to a second embodiment of the present invention comprises: display panel 164, wherein arrange m * n organic EL OLED with matrix-type; Data driver 161; Pre-charge driver 162; Scanner driver 163; Data comparator 167; Gray level judgment part 166; And precharge controller 165.
In display panel 164, m data line D1-Dm and n sweep trace S1-Sn are intersected with each other, and arrange organic EL OLED in its point of crossing.
Under the control of precharge controller 165, before data are lower than benchmark gray level α gs after data line D1-Dm discharge, pre-charge driver 162 is charged with pre-charge current, and optionally before the data of the gray level that will be higher than benchmark gray level α gs are provided to data line D1-Dm, in data line D1-Dm, produce discharge or charging data line D1-Dm.Here, benchmark gray level α gs is corresponding to the gray level of brightness 30%-50% when the high-high brightness of organic EL element OLED is 100%.
Gray level judgment part 166 is judged the gray level of digital of digital video data and is provided gray level to arrive precharge controller 165.
Precharge controller 165 control pre-charge driver 162, if make based on the gray level judged result of gray level judgment part 166 and the data comparative result of data comparator 167, judge that the data that are provided to data line D1-Dm are the data that are lower than benchmark gray level α gs, then during the non-scan period, produce the data line D1-Dm that charges afterwards that discharges therein.And, precharge controller 165 control pre-charge driver 162, if make based on the gray level judged result of gray level judgment part 166 and the data comparative result of data comparator 167, judge that the data that are provided to data line D1-Dm are the data that are higher than benchmark gray level α gs, then in charging data line D1-Dm during the non-scan period or generation discharge in data line D1-Dm.Here, in data is to be higher than under the data conditions of gray level of benchmark gray level α gs, precharge controller 165 control pre-charge driver 162, if make the capable data of n have the data higher gray-scale value more capable than n-1, the corresponding data line of charging during capable scan period of n-1 and the n non-scan period between the capable scan period then.But on the other hand, in data is to be higher than under the data conditions of gray level of benchmark gray level α gs, precharge control 165 control pre-charge driver 162, if make the capable data of n have the data lower gray-scale value more capable, then during capable scan period of n-1 and the n non-scan period between the capable scan period, produce discharge at corresponding data line than n-1.
Figure 13 represents the embodiment of pre-charge driver 162 as shown in figure 12.
With reference to Figure 12, pre-charge driver 162 comprises: the first switching device 162A, to provide low potential voltage Vss to data line D1-Dm in response to the first control signal φ 1; Second switch device 162B is to provide pre-charge current Ipre to data line D1-Dm in response to the second control signal φ 2; And the 3rd switching device 162C, to provide data current Id1 to data line D1-Dm in response to the 3rd control signal φ 3.
Low potential voltage is 0V or ground voltage GND.
Provide control signal φ 1, φ 2, φ 3 from precharge controller 165.
The first switching device 162A is connected between low potential voltage source V ss and the data point D1-Dn, and connects to produce discharge in data line D1-Dm in response to the first control signal φ 1.
Second switch device 162B is connected between pre-charge current source Ipre and the data line D1-Dn, and connects in response to the second control signal φ 2, to use pre-charge current Ipre charging data line D1-Dm.
The 3rd switching device 162C is connected between the output port and data line D1-Dn of data driver 161, and is switched in response to the 3rd control signal φ 3, to provide data current Id1 to data line D1-Dm.
Figure 14 is the view that is used to explain according to the driving method of the organic electro-luminescence display device of second embodiment of the invention, and it is the oscillogram that expression is provided to the data current of first data line and is provided to the scanning impulse of the first and second sweep trace S1, S2.
With reference to Figure 14, driving method according to organic electro-luminescence display device of the present invention, when scanning impulse Sp1, Sp2 are provided to sweep trace S1, S2, non-scanning impulse is provided between scan period sc, and when the data current Id1, the Id2 that provide are lower than the benchmark gray level, during the non-scan period msc between the scan period sc, after producing discharge, data line D1 provides pre-charge current Ipre.When the data that are lower than the benchmark gray level are provided, comprise discharge cycle dcha and the charge cycle pcha after discharge cycle dcha at the non-scan period nsc that provides between the scan period sc.
And, when the data current Id3 of the gray level that is higher than the benchmark gray level is provided, during the non-scan period nsc between the scan period sc, driving method according to the organic electro-luminescence display device of second embodiment of the invention, comprise if data current Id3 is higher than previous data current Id2, then provide pre-charge current Ipre to data line D1, but on the other hand, if data current Id3 is lower than previous data current Id2, then produce discharge at data line D1.
On the other hand, according to the organic electro-luminescence display device and the driving method thereof of second embodiment of the invention, even explained embodiment based on passive way, it can be applied to the organic electro-luminescence display device of any known type.
As mentioned above, according to organic electro-luminescence display device of the present invention and driving method thereof the magnitude of current at each gray level optimization pre-charge current of data, therefore do not have overshoot at high grade grey level, accelerate and increased the gray level representation ability in the whole gray level response speed.
In addition, if be provided to the data of data line is the data that are lower than the benchmark gray level, pre-charge current charges after data line produces discharge, but on the other hand, if be provided to the data of data line is the data that are higher than the benchmark gray level, and then the comparative result according to data line produces charge or discharge in data line.As a result, can improve the gray level representation ability in the low gray level and reduce energy consumption according to organic electro-luminescence display device of the present invention and driving method thereof.
Though explained the present invention by the embodiment shown in the aforesaid accompanying drawing, it should be understood by one skilled in the art that to the invention is not restricted to embodiment, but under the situation that does not break away from spirit of the present invention, can make multiple modification or change.Therefore, scope of the present invention should only be determined by appended claim and equivalent thereof.
Claims (8)
1. organic electro-luminescence display device, it comprises:
Display panel, it has many data lines, the multi-strip scanning line that intersects with described many data lines, and a plurality of electroluminescent cells that are provided with at described many data lines and multi-strip scanning line place intersected with each other;
Question blank, it deposits pre-charge current data, and wherein these pre-charge current data are indicated the magnitude of current of pre-charge current, and increase the magnitude of current index minimizing of pre-charge current along with gray level;
Controller, the gray level that it judges data reads the pre-charge current data corresponding to the gray level of data, and according to pre-charge current Data Control pre-charge driver;
Pre-charge driver, its gray level according to these data is selected pre-charge current, and provides described pre-charge current to described a plurality of electroluminescent cells by many data lines; And
Data driver, it provides these data to described a plurality of electroluminescent cells.
2. organic electro-luminescence display device as claimed in claim 1, it further comprises:
Scanner driver, it provides scanning impulse with data sync to the multi-strip scanning line.
3. organic electro-luminescence display device as claimed in claim 1, wherein this pre-charge driver comprises:
A plurality of current sources, its current value differs from one another;
Select part, it selects in a plurality of current sources any one as pre-charge current; And
First switching device, it provides pre-charge current to data line in the non-display cycle.
4. organic electro-luminescence display device as claimed in claim 3, wherein this data driver comprises:
The second switch device provides data current to data line in its display cycle after the non-display cycle.
5. the driving method of an organic electro-luminescence display device, this equipment has many data lines, the multi-strip scanning line that intersects with described many data lines, and a plurality of electroluminescent cells that are provided with at described many data lines and multi-strip scanning line place intersected with each other, the method comprising the steps of:
One pre-charge current data of the magnitude of current of indication pre-charge current are provided, and increase the magnitude of current index minimizing of pre-charge current along with gray level;
Judge the gray level of data, read pre-charge current data corresponding to the gray level of data, and according to this pre-charge current Data Control pre-charge current;
Gray level according to these data is selected pre-charge current;
Provide described pre-charge current to described a plurality of electroluminescent cells by many data lines; And
Provide these data to described a plurality of electroluminescent cells.
6. driving method as claimed in claim 5 further comprises step:
Provide scanning impulse with data sync to sweep trace.
7. driving method as claimed in claim 5, wherein, the step of this selection pre-charge current comprises step:
Select in a plurality of current sources that its current value differs from one another any one as pre-charge current; With
In the non-display cycle, provide pre-charge current to data line.
8. driving method as claimed in claim 7 wherein, provides these data to comprise step to the step of described a plurality of electroluminescent cells;
Display cycle for after the non-display cycle, provide data to data line.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040039748A KR100580557B1 (en) | 2004-06-01 | 2004-06-01 | Organic electro-luminescence display device and driving method thereof |
| KR1020040039748 | 2004-06-01 | ||
| KR1020040042115 | 2004-06-09 |
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| CN1705002A CN1705002A (en) | 2005-12-07 |
| CN100447842C true CN100447842C (en) | 2008-12-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI323872B (en) | 2006-01-19 | 2010-04-21 | Au Optronics Corp | Active matrix organic light emitting diode display and driving method thereof |
| KR20070091851A (en) * | 2006-03-07 | 2007-09-12 | 엘지전자 주식회사 | Driving method for light emitting diode |
| US8259043B2 (en) | 2007-06-07 | 2012-09-04 | Honeywell International Inc. | Hybrid driver for light-emitting diode displays |
| CN102661494B (en) * | 2012-04-09 | 2015-11-18 | 深圳市中庆微科技开发有限公司 | A kind of LED, module and display methods |
| TWI587265B (en) * | 2016-05-31 | 2017-06-11 | 瑞鼎科技股份有限公司 | Display driving apparatus |
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|---|---|---|---|---|
| CN1242563A (en) * | 1998-04-30 | 2000-01-26 | 索尼公司 | Matrix driving method and apparatus for current-driven display elements |
| US20020169575A1 (en) * | 2001-05-09 | 2002-11-14 | James Everitt | Matrix element voltage sensing for precharge |
| WO2003034390A2 (en) * | 2001-10-19 | 2003-04-24 | Clare Micronix Integrated Systems, Inc. | Precharge circuit and method for passive matrix oled display |
-
2004
- 2004-06-01 KR KR1020040039748A patent/KR100580557B1/en active IP Right Grant
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1242563A (en) * | 1998-04-30 | 2000-01-26 | 索尼公司 | Matrix driving method and apparatus for current-driven display elements |
| US20020169575A1 (en) * | 2001-05-09 | 2002-11-14 | James Everitt | Matrix element voltage sensing for precharge |
| WO2003034390A2 (en) * | 2001-10-19 | 2003-04-24 | Clare Micronix Integrated Systems, Inc. | Precharge circuit and method for passive matrix oled display |
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| Publication number | Publication date |
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| KR20050114515A (en) | 2005-12-06 |
| CN1705002A (en) | 2005-12-07 |
| KR100580557B1 (en) | 2006-05-16 |
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