CN102651190A - AM-OLED (Active Matrix Organic Light-Emitting Diode) drive device, AM-OLED drive method and AM-OLED display device - Google Patents
AM-OLED (Active Matrix Organic Light-Emitting Diode) drive device, AM-OLED drive method and AM-OLED display device Download PDFInfo
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Abstract
The invention discloses an AM-OLED (Active Matrix Organic Light-Emitting Diode) drive device, which relates to the technical field of LOED display. The AM-OLED drive device comprises a TFT-LCD (Thin Form Transistor-Liquid Crystal Display) drive chip and a data voltage converter which is connected with the TFT-LCD drive chip, wherein the data voltage converter comprises a timing control circuit and a data processing circuit, the timing control circuit is used for monitoring the timing of high-low level fluctuation of a public voltage of the TFT-LCD drive chip, and the data processing circuit is used for replacing input data by TFT-LCD display data corresponding to a drive voltage before and after the level fluctuation of the public voltage according to the level fluctuation of the public voltage, which is monitored by the timing control circuit, and the drive voltage corresponding to the current input data and transmitting the TFT-LCD display data to the TFT-LCD drive chip. The invention also discloses an AM-OLED drive method. According to the invention, the drive for an AM-OLED is realized by utilizing the TFT-LCD drive chip.
Description
Technical field
The present invention relates to Organic Light Emitting Diode display technique field, particularly a kind of AM-OLED drive unit, driving method and AM-OLED display device.
Background technology
Show at active matrix organic light-emitting diode (Active Matrix Organic Light-Emitting Diode, AM-OLED) in, if adopt the N transistor npn npn as driving tube.The grid of TFT (gate) line cut-in voltage is a positive polarity so, and it is negative polarity that opposite gate line is closed voltage.When showing, the gate line of first order TFT is lined by line scan, and work wave is as shown in Figure 1.About data (data) line, they are to be used for driving next stage TFT (Thin Firm Transistor, thin film transistor (TFT)); The voltage of the gate end through control TFT, and then control flows through the electric current of light emitting diode, to reach the effect of control brightness; So need the data line drive waveforms of chip for driving input, waveform is as shown in Figure 2, when scanning impulse arrives; According on the luma data line that will show different voltages with different being arranged, and voltage does not overturn.For the TFT-LCD chip for driving, be divided into two kinds by the AC and DC of public (COMMON) voltage, when the COMMON voltage that possibly be suitable for during for situation about exchanging, the chip for driving output waveform is as shown in Figure 3.Because the liquid crystal of LCD has polarization phenomena, so need the voltage upset on the data line of LCD chip for driving, frame upset, row upset, some upset etc. are arranged usually, Fig. 3 shows the situation of frame upset, and each gray scale voltage is along with COMMOM voltage overturns.Because the specific drive chip of AM-OLED is rare; Can be with TFT-LCD (Thin Firm Transistor Liquid Crystal Display; Thin Film Transistor-LCD) chip for driving is applied among the AM-OLED; But because the data line voltage of TFT-LCD chip for driving output has rollover characteristics; And AM-OLED display driver data line voltage does not have rollover characteristics, and therefore, the compatibility that rollover characteristics that the data line voltage of TFT-LCD chip for driving output can not be changed and AM-OLED display driver data line voltage do not overturn is a problem demanding prompt solution.
Summary of the invention
The technical matters that (one) will solve
The technical matters that the present invention will solve is: the characteristic that the compatible AM-OLED display driver of the rollover characteristics that the data line voltage that the TFT-LCD chip for driving is exported can not be changed data line voltage does not overturn makes the TFT-LCD chip for driving be used to drive the AM-OLED display device.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of AM-OLED drive unit, comprising: TFT-LCD chip for driving and the data voltage converter that is connected with said TFT-LCD chip for driving, said data voltage converter comprises:
Sequential control circuit is used to monitor the sequential that the common electric voltage high-low level of said TFT-LCD chip for driving changes;
Data processing circuit; The driving voltage that the common voltage level that is used for monitoring according to said sequential control circuit changes and present input data is corresponding; Said input data are replaced to common voltage level change the corresponding TFT-LCD video data of the said driving voltage in front and back, and give said TFT-LCD chip for driving said TFT-LCD display data transmissions.
Wherein, said data processing circuit is:
Truth table is searched circuit; The driving voltage that the common voltage level that is used for monitoring according to said sequential control circuit changes and present input data is corresponding; In the truth table of TFT-LCD chip for driving, search the 2nd TFT-LCD video data after common voltage level changes a preceding TFT-LCD video data and common voltage level variation; And give said TFT-LCD chip for driving with a said TFT-LCD video data or said the 2nd TFT-LCD display data transmissions; In said truth table, the magnitude of voltage that TFT-LCD display voltage value that a said TFT-LCD video data and the 2nd TFT-LCD video data are corresponding and said driving voltage difference are minimum.
Wherein, said data processing circuit is:
The gray shade scale counting circuit; The driving voltage that the common voltage level that is used for monitoring according to said sequential control circuit changes and present input data is corresponding; Utilize the gray shade scale formula of TFT-LCD chip for driving to calculate the TFT-LCD video data after common voltage level changes a preceding TFT-LCD video data and common voltage level variation; And give said TFT-LCD chip for driving with a said TFT-LCD video data or TFT-LCD display data transmissions, the TFT-LCD display voltage value that a said TFT-LCD video data and the 2nd TFT-LCD video data are corresponding be calculate gained with the minimum magnitude of voltage of said driving voltage difference.
Wherein, said data voltage converter is: FPGA or CPLD.
The present invention also provides a kind of AM-OLED driving method that utilizes above-mentioned device, may further comprise the steps:
S1: the driving voltage corresponding according to current input data replaces to the corresponding TFT-LCD video data of said driving voltage with said input data;
S2:, want data presented to show said current AM-OLED according to the data line of the corresponding display voltage driving AM-OLED of a said TFT-LCD video data;
S3: after the common electric voltage generation level that monitors the TFT-LCD chip for driving changed, said data processing circuit replaced to the 2nd corresponding TFT-LCD video data of said driving voltage according to said driving voltage with said input data;
S4:, want data presented to show said current AM-OLED according to the data line of the corresponding display voltage driving AM-OLED of said TFT-LCD video data.
Wherein, among the said step S1, the mode of replacement is:
According to said driving voltage; In the truth table of TFT-LCD chip for driving, search the TFT-LCD video data before common voltage level changes; In said truth table; The magnitude of voltage that TFT-LCD display voltage value that a said TFT-LCD video data is corresponding and said driving voltage difference are minimum, or
According to said driving voltage; Utilize the gray shade scale formula of TFT-LCD chip for driving to calculate the TFT-LCD video data before common voltage level changes, the TFT-LCD display voltage value that a said TFT-LCD video data is corresponding be calculate gained with the minimum magnitude of voltage of said driving voltage difference.
Wherein, among the said step S3, the mode of replacement is:
According to said driving voltage; In the truth table of TFT-LCD chip for driving, search the 2nd TFT-LCD video data after common voltage level changes; In said truth table; The magnitude of voltage that TFT-LCD display voltage value that said the 2nd TFT-LCD video data is corresponding and said driving voltage difference are minimum, or
According to said driving voltage; Utilize the gray shade scale formula of TFT-LCD chip for driving to calculate the 2nd TFT-LCD video data after common voltage level changes, the TFT-LCD display voltage value that said the 2nd TFT-LCD video data is corresponding be calculate gained with the minimum magnitude of voltage of said driving voltage difference.
Wherein, among said step S1 and the S3, said data processing circuit is imported data through rgb interface to said TFT-LCD chip for driving.
Wherein, among the said step S3, said sequential control circuit is judged the height change in voltage of common electric voltage through the signal identical with said common electric voltage of outside input.
The present invention also provides a kind of AM-OLED display device, and the drive unit of said AM-OLED display device is above-mentioned arbitrary AM-OLED drive unit.
(3) beneficial effect
The present invention keeps the constant mode of output voltage of its chip for driving through the video data of conversion TFT-LCD; The characteristic that the data line voltage that makes output voltage can satisfy AM-OLED does not overturn; Thereby realized driving to AM-OLED; And need not wait customization IC, reduced money cost and time cost in a large number.
Description of drawings
Fig. 1 is AM-OLED structure and gate line thereof the waveform synoptic diagram of lining by line scan;
Fig. 2 is AM-OLED work hours according to line voltage and the gate line waveform corresponding relation figure that lines by line scan;
The common electric voltage of TFT-LCD chip for driving and the data line voltage corresponding relation figure of its output when Fig. 3 is TFT-LCD work;
Fig. 4 is a kind of AM-OLED driving device structure synoptic diagram of the embodiment of the invention;
Fig. 5 adopts the common electric voltage of TFT-LCD chip for driving behind the device of Fig. 4 and the data line voltage corresponding relation figure of its output;
Fig. 6 is the data line voltage of TFT-LCD chip for driving output corresponding input data and curve relation figure of voltage when being odd-numbered frame;
Fig. 7 is the data line voltage of TFT-LCD chip for driving output corresponding input data and curve relation figure of voltage when being even frame;
Fig. 8 is a kind of AM-OLED driving method process flow diagram of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Though voltage is the data line output voltage upset of the TFT-LCD chip for driving output of interchange, and the voltage of output is positive polarity, this is the key that meets the AM-OLED driving of N transistor npn npn for public (COMMON).For better explanation, quantize the driving voltage among Fig. 3 now: the low level that COMMON voltage is set is-1V that high level is 9V.The liquid crystal of supposing so to show a certain brightness at certain some the two poles of the earth required voltage up and down is 6V, is that this data line voltage of that frame of low level-1V should be 5V at COMMON so, and is that this data line voltage of next frame of high level 9V can overturn and is 3V at COMMOM.But chip for driving is indeclinable in the data of display message input in this process.For example: the scope for the display message of 256 GTGs input data is 0x00-0xff, if display message input data are 0x1f when under COMMON is the situation of low level-1V, making output data line voltage be 5V; The voltage of when COMMON is high level 9V, being exported during display message data 0x1f so can overturn and be 3V.
But the characteristic of not overturning corresponding to the data line voltage of AM-OLED; Need supposing data line voltage is 4V; Need import video data at COMMON during for low level so is 0x1f, can obtain constant data line 4V voltage at COMMON through changing video data (video data of TFT-LCD) during for high level.
The present invention is particularly useful for the frame upset, because the COMMON voltage of row upset or some upset is DC voltage, data line voltage is that upset is done on the basis with COMMON voltage, and the data line voltage scope of adjacent two frames of same point is different.Can not reach identical output voltage through regulating the input data.
Based on above-mentioned principle; AM-OLED driving device structure of the present invention is as shown in Figure 3, comprising: TFT-LCD chip for driving and the data voltage converter that is connected with the TFT-LCD chip for driving, certainly; Normally connect through flexible PCB FPC, the data voltage converter comprises:
Sequential control circuit is used to monitor the sequential that the common electric voltage high-low level of said TFT-LCD chip for driving changes.Can realize monitoring through the external signal identical, and the variation sequential of the common electric voltage of monitoring is notified to data processing circuit with common voltage level.
Data processing circuit; The driving voltage that the common voltage level that is used for monitoring according to said sequential control circuit changes and present input data is corresponding; Said input data are replaced to common voltage level change the corresponding TFT-LCD video data of the said driving voltage in front and back, and give said TFT-LCD chip for driving said TFT-LCD display data transmissions.The TFT-LCD video data comprises: the 2nd TFT-LCD video data after TFT-LCD video data before common voltage level changes and common voltage level change.
The concrete available FPGA of data voltage converter (Field-Programmable Gate Array; Field programmable gate array), CPLD (Complex Programmable Logic Device; CPLD) or other programmable chip programming realize, promptly in FPGA or CPLD, realize concrete sequential control circuit and data processing circuit through programming.
Wherein, data processing circuit is: truth table is searched circuit, and it is following to utilize the truth table of TFT-LCD chip for driving to obtain the concrete mode of a TFT-LCD video data or the 2nd TFT-LCD video data:
Search the output voltage that AM-OLED wants video data at truth table, and the TFT-LCD video data that this voltage is corresponding inputs to the TFT-LCD chip for driving as a TFT-LCD video data.After common electric voltage changes; Data processing circuit is searched in the truth table of TFT-LCD chip for driving with the input data (a TFT-LCD video data) of next frame image after said driving voltage changes as common electric voltage near the corresponding data of the voltage of (equating that preferably display effect is better) and is inputed to the TFT-LCD chip for driving.As shown in Figure 5, the data line voltage of its output was consistent before and after visible common electric voltage through the TFT-LCD chip for driving behind the device of Fig. 4 changed.
For example: following table is the part of TFT-LCD chip for driving truth table.About form be respectively TFT-LCD will show identical data the time, this data corresponding data line voltage before and after common electric voltage changes.
If it is A that AM-OLED wants data presented; Show that the corresponding voltage of these data needs 0.578xVDDA; Then that 0.578xVDDA is corresponding data 2DH (a TFT-LCD video data) inputs to the TFT-LCD chip for driving; Making the voltage of TFT-LCD chip for driving output is 0.578xVDDA, thereby can in AM-OLED, show A.The data line voltage of exporting owing to the TFT-LCD chip for driving can overturn along with the level variation of common electric voltage, if still import 2DH after the upset, then the voltage of TFT-LCD chip for driving output is 0.422xVDDA, and then AM-OLED can not show A.For after the level variation of common electric voltage; AM-OLED can also correctly show; Then search immediate voltage 0.576xVDDA on the right the table with 0.578xVDDA; The data 11H (the 2nd TFT-LCD video data) that 0.576xVDDA is corresponding inputs to the TFT-LCD chip for driving, and the voltage that makes the output of TFT-LCD chip for driving is near 0.578xVDDA, thereby can in AM-OLED, show A.
If regard the upset of the data line voltage of exporting as parity frame replace; So like Fig. 6 and shown in Figure 7; A constant voltage must find two different data, makes constant the getting final product of TFT-LCD chip for driving output voltage promptly when the odd and even number frame, for respectively two different data.
Different with embodiment 1 is; Data processing circuit is: the gray shade scale counting circuit; The driving voltage that the common voltage level that is used for monitoring according to said sequential control circuit changes and present input data is corresponding; Utilize the gray shade scale formula (gamma formula) of TFT-LCD chip for driving to calculate the 2nd TFT-LCD video data after common voltage level changes a preceding TFT-LCD video data and common voltage level variation; And give said TFT-LCD chip for driving with a said TFT-LCD video data or the 2nd TFT-LCD display data transmissions, the TFT-LCD display voltage that a said TFT-LCD video data and the 2nd TFT-LCD video data are corresponding be calculate gained with the immediate voltage of said driving voltage.
Formula in the chip for driving of each different manufacturers or different TFT-LCD is different.Its essence is exactly truth table.
For example: usually earlier confirm two voltage VA, VB, the gray scale voltage V1～V15 in the middle of so is to be that to draw data 01h～0Fh corresponding data line voltage be V1～V15 successively on the basis with these two voltages:
During the N frame: (the back coefficient is that chip for driving producer fixedly provides, and different producer's chips have different coefficients).
V1＝VA+(VB-VA)×0.8/12.8
V2＝VA+(VB-VA)×1.6/12.8
V3＝VA+(VB-VA)×2.4/12.8
V4＝VA+(VB-VA)×3.2/12.8
V5＝VA+(V17-VA)×4/12.8
V6＝VA+(VB-VA)×4.8/12.8
V7＝VA+(VB-VA)×5.6/12.8
V8＝VA+(VB-VA)×6.4/12.8
V9＝VA+(VB-VA)×7.2/12.8
V10＝VA+(VB-VA)×8/12.8
V11＝VA+(VB-VA)×8.8/12.8
V12＝VA+(VB-VA)×9.6/12.8
V13＝VA+(VB-VA)×10.4/12.8
V14＝VA+(VB-VA)×11.2/12.8
V15＝VA+(VB-VA)×12/12.8
During the N+1 frame:
V1＝VA+(VB-VA)×12/12.8
V2＝VA+(VB-VA)×11.2/12.8
V3＝VA+(VB-VA)×10.4/12.8
V4＝VA+(VB-VA)×9.6/12.8
V5＝VA+(V17-VA)×8.8/12.8
V6＝VA+(VB-VA)×8/12.8
V7＝VA+(VB-VA)×7.2/12.8
V8＝VA+(VB-VA)×6.4/12.8
V9＝VA+(VB-VA)×5.6/12.8
V10＝VA+(VB-VA)×4.8/12.8
V11＝VA+(VB-VA)×4/12.8
V12＝VA+(VB-VA)×3.2/12.8
V13＝VA+(VB-VA)×2.4/12.8
V14＝VA+(VB-VA)×1.6/12.8
V15＝VA+(VB-VA)×0.8/12.8
Can find out that (for example: 03h) corresponding voltage V3 can find the corresponding voltage V13 of data 0Dh to equate with it for certain data of N frame when the N+1 frame.
Embodiment 3
As shown in Figure 8, realize the process flow diagram that AM-OLED drives for utilizing the device among the embodiment 1, comprising:
Step S801, the driving voltage corresponding according to present input data replaces to the corresponding TFT-LCD video data of said driving voltage with said input data.Concrete substitute mode is: data processing circuit is searched in the truth table of TFT-LCD chip for driving according to the corresponding driving voltage of present input data or is calculated a TFT-LCD video data corresponding with said driving voltage through the gamma formula; And a said TFT-LCD video data imported said TFT-LCD chip for driving; Particularly, import through rgb interface.Said input data are that current AM-OLED wants data presented.
Step S802, said TFT-LCD chip for driving is wanted data presented according to the data line of the corresponding display voltage driving AM-OLED of a said TFT-LCD video data to show said current AM-OLED.
Step S803; Monitor the common electric voltage generation height change in voltage of TFT-LCD chip for driving when the said sequential control circuit basis external input signal identical after with said common electric voltage; Said data processing circuit is searched in the truth table of TFT-LCD chip for driving or is calculated the 2nd TFT-LCD video data after the data corresponding with said driving voltage change as common electric voltage through the gamma formula; And said the 2nd TFT-LCD video data imported said TFT-LCD chip for driving; Particularly, import through rgb interface.
Step S804, said TFT-LCD chip for driving is wanted data presented according to the data line of the corresponding display voltage driving AM-OLED of said the 2nd TFT-LCD video data to show said current AM-OLED.
The TFT-LCD display voltage that a said TFT-LCD video data and the 2nd TFT-LCD video data are corresponding be in the TFT-LCD chip for driving truth table or calculate gained through the gamma formula with the immediate voltage of said driving voltage; If the equal better display effect that can arrive, the concrete implementation in the above-mentioned steps has description respectively in embodiment 1 and 2.
A kind of AM-OLED display device, the drive unit of this AM-OLED display device are the AM-OLED drive unit in the foregoing description 1.
Above embodiment only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. an AM-OLED drive unit is characterized in that, comprising: TFT-LCD chip for driving and the data voltage converter that is connected with said TFT-LCD chip for driving, and said data voltage converter comprises:
Sequential control circuit is used to monitor the sequential that the common electric voltage high-low level of said TFT-LCD chip for driving changes;
Data processing circuit; The driving voltage that the common voltage level that is used for monitoring according to said sequential control circuit changes and present input data is corresponding; Said input data are replaced to common voltage level change the corresponding TFT-LCD video data of the said driving voltage in front and back, and give said TFT-LCD chip for driving said TFT-LCD display data transmissions.
2. AM-OLED drive unit as claimed in claim 1 is characterized in that, said data processing circuit is:
Truth table is searched circuit; The driving voltage that the common voltage level that is used for monitoring according to said sequential control circuit changes and present input data is corresponding; In the truth table of TFT-LCD chip for driving, search the 2nd TFT-LCD video data after common voltage level changes a preceding TFT-LCD video data and common voltage level variation; And give said TFT-LCD chip for driving with a said TFT-LCD video data or said the 2nd TFT-LCD display data transmissions; In said truth table, the magnitude of voltage that TFT-LCD display voltage value that a said TFT-LCD video data and the 2nd TFT-LCD video data are corresponding and said driving voltage difference are minimum.
3. AM-OLED drive unit as claimed in claim 1 is characterized in that, said data processing circuit is:
The gray shade scale counting circuit; The driving voltage that the common voltage level that is used for monitoring according to said sequential control circuit changes and present input data is corresponding; Utilize the gray shade scale formula of TFT-LCD chip for driving to calculate the 2nd TFT-LCD video data after common voltage level changes a preceding TFT-LCD video data and common voltage level variation; And give said TFT-LCD chip for driving with a said TFT-LCD video data or the 2nd TFT-LCD display data transmissions, the TFT-LCD display voltage value that a said TFT-LCD video data and TFT-LCD video data are corresponding be calculate gained with the minimum magnitude of voltage of said driving voltage difference.
4. like each described AM-OLED drive unit in the claim 1～3, it is characterized in that said data voltage converter is: FPGA or CPLD.
5. an AM-OLED driving method that utilizes each described device of claim 1～4 is characterized in that, may further comprise the steps:
S1: the driving voltage corresponding according to current input data replaces to the corresponding TFT-LCD video data of said driving voltage with said input data;
S2:, want data presented to show said current AM-OLED according to the data line of the corresponding display voltage driving AM-OLED of a said TFT-LCD video data;
S3: after the common electric voltage generation level that monitors the TFT-LCD chip for driving changed, said data processing circuit replaced to the corresponding TFT-LCD video data of said driving voltage according to said driving voltage with said input data;
S4:, want data presented to show said current AM-OLED according to the data line of the corresponding display voltage driving AM-OLED of said TFT-LCD video data.
6. AM-OLED driving method as claimed in claim 5 is characterized in that, among the said step S1, the mode of replacement is:
According to said driving voltage; In the truth table of TFT-LCD chip for driving, search the TFT-LCD video data before common voltage level changes; In said truth table; The magnitude of voltage that TFT-LCD display voltage value that a said TFT-LCD video data is corresponding and said driving voltage difference are minimum, or
According to said driving voltage; Utilize the gray shade scale formula of TFT-LCD chip for driving to calculate the TFT-LCD video data before common voltage level changes, the TFT-LCD display voltage value that a said TFT-LCD video data is corresponding be calculate gained with the minimum magnitude of voltage of said driving voltage difference.
7. AM-OLED driving method as claimed in claim 5 is characterized in that, among the said step S3, the mode of replacement is:
According to said driving voltage; In the truth table of TFT-LCD chip for driving, search the TFT-LCD video data after common voltage level changes; In said truth table; The magnitude of voltage that TFT-LCD display voltage value that said the 2nd TFT-LCD video data is corresponding and said driving voltage difference are minimum, or
According to said driving voltage; Utilize the gray shade scale formula of TFT-LCD chip for driving to calculate the TFT-LCD video data after common voltage level changes, the TFT-LCD display voltage value that said the 2nd TFT-LCD video data is corresponding be calculate gained with the minimum magnitude of voltage of said driving voltage difference.
8. AM-OLED driving method as claimed in claim 5 is characterized in that, among said step S1 and the S3, said data processing circuit is imported data through rgb interface to said TFT-LCD chip for driving.
9. like each described AM-OLED driving method in the claim 5～8, it is characterized in that among the said step S3, said sequential control circuit is judged the height change in voltage of common electric voltage through the signal identical with said common electric voltage of outside input.
10. an AM-OLED display device is characterized in that, the drive unit of said AM-OLED display device is each described AM-OLED drive unit in the claim 1～4.
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| CN107610661A (en) * | 2017-09-19 | 2018-01-19 | 惠科股份有限公司 | The Drive And Its Driving Method of display device |
| WO2019056440A1 (en) * | 2017-09-19 | 2019-03-28 | 惠科股份有限公司 | Driving apparatus and driving method for display apparatus |
| CN107610661B (en) * | 2017-09-19 | 2019-07-16 | 惠科股份有限公司 | The Drive And Its Driving Method of display device |
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| CN102651190B (en) | 2014-11-05 |
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