CN100353391C - Data driving circuit for current driven display element - Google Patents
Data driving circuit for current driven display element Download PDFInfo
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- CN100353391C CN100353391C CNB031090125A CN03109012A CN100353391C CN 100353391 C CN100353391 C CN 100353391C CN B031090125 A CNB031090125 A CN B031090125A CN 03109012 A CN03109012 A CN 03109012A CN 100353391 C CN100353391 C CN 100353391C
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Abstract
The present invention provides a data driving circuit for a display element driven by a current, which is used for receiving a digital signal and outputting a greyscale current signal to a data line. The data driving circuit comprises a current converter for numerical simulation, a current storing and copying module and a control circuit, wherein the current converter for numerical simulation is used for converting the received digital signal into a simulating current signal. The current storing and copying module is used for storing a presetting voltage needed by circulating the simulating current signal within a converting and storing stage, and a copying current signal is conducted to the data line in a reproducing persisting stage. The control circuit is used for carrying out exchange between the converting and storing stage and the reproducing persisting stage, wherein the copying current signal is the greyscale current signal, and the copying current signal is almost equivalent to the simulating current signal.
Description
Technical field
The invention provides a kind of data drive circuit (DataDriver) that is used for the display element of a current drives, refer in particular to a kind of electric current storage replication module that includes to have the data drive circuit of electric current storage replication function.
Prior art
Organic Light Emitting Diode (Organic Light Emittirg Device, OLED) display has the tool high brightness, reaction velocity is fast, the visual angle is big, autoluminescence, advantage such as slim, with LCD (liquidcrystal display, LCD) and relevant display device identical, organic light emitting diode display can make gently, approaches, short and small display device, development potentiality can extend to numerous electric equipment products, as the field of mobile computer and digital camera, and even all use can be brought to the field of astronavigation and medical diagnostic equipment.Organic Light Emitting Diode is originally as a current driving element, its luminosity is to decide according to the size by electric current, at present Organic Light Emitting Diode being applied on the matrix form display (Matrix Display) promptly is size by controller light emitting diode drive current, reaches the effect that shows different brightness (being called gray scale again).
According to the difference of scanning line driving mode, matrix type organic light-emitting diode display can be divided into two kinds of passive type matrix (Passive Matrix) display and active type matrix (Active Matrix) displays.The passive type matrix display is to adopt the mode of driven sweep line in proper order, drive the pixel be positioned at different rows/list one by one, therefore the fluorescent lifetime of each pixel that go/lists can be subject to the sweep frequency and the number of scanning lines of display, is not suitable for the display of big picture and high definition (the expression sweep trace increases).The active type matrix display then forms independently image element circuit in each pixel, ask for an interview Fig. 1, and Fig. 1 is the synoptic diagram of the circuit structure of a pixel 20.The embodiment of Fig. 1 includes an electric capacity (Capacitor) C1, an Organic Light Emitting Diode D and a plurality of metal-oxide semiconductor (MOS) (Metal-Oxide Semiconductor, MOS) transistor or thin film transistor (TFT) (Thin-filmTransistor, TFT) T1～T4, utilize pixel 20 circuit to regulate the size of the drive current I of Organic Light Emitting Diode D, even therefore under the requirement of big picture and high definition, still can continue to provide each pixel 20 1 stabilized driving electric current I, improve the brightness uniformity of display.
In addition, in order to reach power saving, the convenience of system in combination and cost-effective purpose, development trend as LCD, many organic light emitting diode display systems take the mode of data with digital kenel input, therefore need digital analog converter (Digital-to-Analog Converter) is incorporated in the data drive circuit, again because the brightness of organic light emitting diode display is to utilize electric current to control, that is, the part of digital analog converter is necessary for the D/A conversion circuit that numerical data can be transferred to analog current, digital simulation current converter circuit just, simultaneously, corresponding pixel portion is also finished with pixel (as the pixel 20 of Fig. 1) folder of current drives, sees also Fig. 2, and Fig. 2 is the functional block diagram of well known data driving circuit.Shown among Fig. 2 corresponding to a data drive circuit 10 as the pixel 20 of Fig. 1, it includes a level shift circuit 12 (Level Shifter), a latch 14 (Latch), a shift register 16 (Shift Register), and a digital simulation current converter 18.The digital signal that level shift circuit 12 will receive (being one 6 digital signal in the present embodiment) is done the adjustment of current potential, after latch 14 is electrically connected to level shifter, function with buffering (Buffering) digital signal, latch 14 can latch this 6 position digital signal, so latch 14 is 6 a latch in the present embodiment, and shift register 16 exportable shift LD signals, the digital signal that once will correspond to a pixel 20 on the display all is sent to level shifter, allow level shifter carry out the function of adjusting voltage and buffering, again digital signal is sent to latch 14, allows latch 14 continue to carry out the function of (boost and) buffering.Digital simulation current converter 18 is connected to after the latch 14, be used for receiving digital signal by latch 14 outputs, with digital data conversion is an analog current signal, and the output analog current signal is to a data line 19, forms color according to the gray scale of the strong and weak control panel of analog current signal.Above-mentioned known basic structure is main to have relevant description in the patents of many data drive circuit designs about LCD and document, and organic light emitting diode display is just done the change of some with it, for example the part of the digital analog converter of LCD is finished with above-mentioned digital simulation current converter circuit.People such as YojiroMatsueda in 1996 at SID 96 Digest, deliver in " Low Temperature poly-SiTFT-LCD with integrated 6-bit Digital Data Driver " and use the fabrication techniques of LTPS on glass data drive circuit, and six digital data drive circuit structure proposed, and at US Patent 6,256,024, in " Liquid crystal display device ", people such as Maekawa also propose the structure close with the foregoing description.
Panel with the input of 4 bit digital data is an example, people (U.of Michigan such as previous J.Kanicki, USA) a kind of simple numerical analog current converter circuit is just proposed, adopting one group of (wide length) ratio is 1: 2: 4: 8 thin film transistor (TFT) (Thin Film Transistor, TFT) current source produces 16 kinds of different electric current gray scale Ig, ask for an interview Fig. 3, Fig. 3 is the synoptic diagram of an embodiment of the digital simulation current converter 18 of Fig. 2 data drive circuit 10, and the digital simulation current converter 18 of this embodiment is made of a plurality of transistor T 5～T9.Since electric current gray scale Ig only by 41: 2: 4: thin film transistor (TFT) T1～T4 of 8 controls, in case wherein threshold voltage of any one thin film transistor (TFT) (Threshold Voltage) and mobility (Mobility) produce bigger variation, promptly have influence on electric current gray scale Ig at once, and then have influence on the demonstration uniformity coefficient of its corresponding panel pixel (as the pixel 20 of Fig. 1 and Fig. 2); In addition, because the output impedance (OutputImpedance) of this kind digital simulation current converter 18 is not high enough, and be vulnerable to flow through the influence of the size of current of digital simulation current converter 18, make the output voltage of digital simulation current converter 18 also can change with the size of output current, make digital simulation current converter 18 and corresponding pixel (as the pixel 20 of Fig. 1 and Fig. 2) when being concatenated into a path, the electric current of its output is not the electric current of very stable 16 gray scales, therefore, still there are many spaces of improving in the well known data driving circuit.
Summary of the invention
Therefore fundamental purpose of the present invention is a kind of data drive circuit with electric current storage replication function, it includes an electric current storage replication module, be used for reproducing conducting one duplicate current signal in the sustained period one, so that a data line of stable gray scale current drives one display element to be provided, to address the above problem.
Purpose of the present invention is for providing a kind of data drive circuit (Data Driver) that is used for the display element of a current drives, it is to be used for receiving a digital signal and to export a gray scale current signal to drive a data line of this display element, this data drive circuit includes a digital simulation current converter (Digital-to-analog Current Converter), is used for received digital signal is converted to an analog current signal; One electric current storage replication module is used at a conversion memory phase stored required predeterminated voltage of this analog current signal that circulates, and reproduces in the sustained period conducting one duplicate current signal to this data line one; And a control circuit, be electrically connected between this digital simulation current converter and this electric current storage replication module, be used between this conversion memory phase and this reproduction sustained period, switching; Wherein this duplicate current signal is this gray scale current signal, and this duplicate current signal is almost equal in this analog current signal; Wherein this electric current storage replication module only comprises at least one electric capacity and a plurality of metal oxide semiconductor transistor or thin film transistor (TFT).
Another object of the present invention is for providing a kind of data drive circuit (Data Driver) that is used for the display element of a current drives, it is to be used for the data line that receives a digital signal and drive this display element, this data drive circuit includes at least one level shift circuit (Level Shifter), is used for adjusting the current potential of the digital signal of this reception; One Current Regulation formula (Current-Steering) digital simulation current converter (Digital-to-analog Current Converter) is electrically connected to this level shift circuit, is used for this digital signal is converted to an analog current signal; One electric current storage replication module, be used at a conversion memory phase stored required predeterminated voltage of this analog current signal that circulates, and conducting one duplicate current signal is to this data line in a reproduction sustained period, and wherein this duplicate current signal is produced by this predeterminated voltage; And a control circuit, be electrically connected between this digital simulation current converter and this electric current storage replication module, be used between this conversion memory phase and this reproduction sustained period, switching; Wherein this duplicate current signal is almost equal in this analog current signal; And wherein this electric current storage replication module only comprises at least one electric capacity and a plurality of metal oxide semiconductor transistor or thin film transistor (TFT).
Description of drawings
Fig. 1 is the synoptic diagram of the circuit structure of a pixel.
Fig. 2 is the functional block diagram of well known data driving circuit one embodiment.
Fig. 3 is the synoptic diagram of Fig. 2 digital simulation current converter one embodiment.
Fig. 4 is the functional block diagram of data drive circuit one embodiment of the present invention.
Fig. 5 is the functional block diagram of another embodiment of data drive circuit of the present invention.
Fig. 6 is the synoptic diagram of Fig. 4 digital simulation current converter circuit one specific embodiment at the conversion memory phase.
Fig. 7 is that Fig. 4 digital simulation current converter circuit one specific embodiment is at the synoptic diagram that reproduces sustained period.
Fig. 8 is applied to the synoptic diagram of an embodiment of a display element for data drive circuit of the present invention.
Fig. 9 is applied to the synoptic diagram of another embodiment of a display element for data drive circuit of the present invention.
The reference numeral explanation
10,30,50 data drive circuits
12,32,52 level shift circuits
14 latchs
16,36,56 shift registers
18,38,58 digital simulation current converters
19,39,69 data lines
20,40,70 pixels
34 digital simulation current converter circuits
42,62 electric current storage replication modules
44,64 control circuits
60 display elements
Embodiment
See also Fig. 4, Fig. 4 is the functional block diagram that includes data drive circuit 30 1 embodiment of the present invention, whole support body is similar to the embodiment of Fig. 2, all be used for receiving a digital signal and export a gray scale current signal to drive a data line 39 of a display element, display element can be Organic Light Emitting Diode (OLED) display, organic macromolecular LED diode (PLED) display and other display systems by current drives.Be setting up of an electric current storage replication module 42 and a control circuit 44 with the topmost difference of known technology.Fig. 3 data-driven electric current 30 still is the data drive circuit corresponding to a pixel 40 on the display, include a level shift circuit 32, a shift register 36 (Shift Register), a digital simulation current converter 38, an electric current storage replication module 42 and a control circuit 44, the part of digital simulation current converter 38 wherein, electric current storage replication module 42 and the control circuit 44 new Digital analog current change-over circuit 34 that is considered as capable of being combined.The adjustment of the digital signal that level shift circuit 32 will receive (being one 6 digital signal in the present embodiment) work and current potential, the function that it can have buffering (Buffering) simultaneously concurrently and latch this 6 position digital signal, and shift register 36 an exportable shift LD signal SR and switching signal SW, the digital signal that shift LD signal SR is used for once will corresponding to a pixel 40 on the display all is sent to level shift circuit 32, allow level shift circuit 32 carry out the function of adjusting voltage and buffering, again digital signal is sent to digital simulation current converter 38, digital simulation current converter 38 is converted to an analog current signal with received digital signal, 42 of electric current storage replication modules are used at the required predeterminated voltage of a conversion memory phase stored circulation analog current signal, and reproduce in the sustained period conducting one duplicate current signal to data line 39 one, the conversion memory phase then cooperates switching signal SW to finish by control circuit 44 with the switching of reproduction between the sustained period, the technical characterictic of this part will after give more detailed description.Data line 39 is connected to pixel 40, and 42 conductings of electric current storage replication module are the gray scale current signal to the replica current of data line 39, and data drive circuit 30 promptly forms color according to the gray scale of the strong and weak control panel of this duplicate current signal.
Note that in the present embodiment the function of level shift circuit 32 has comprised the function of the latch 14 in Fig. 2 known technology, when reality is implemented, can set up latch in addition in system, and the level shift circuit 32 or number of latch need not limit, visual actual conditions are increased and decreased.In addition, switching signal SW can be described in Fig. 4 embodiment by shift register 36 generation, also can produce by other relevant control module, ask for an interview Fig. 5, Fig. 5 is the functional block diagram of Fig. 4 data drive circuit 30 another embodiment, the function of element that Fig. 5 describes and coding are all identical with Fig. 4, and only difference is that switching signal SW is by other relevant control module, is produced by shift register 36.
See also Fig. 6, Fig. 6 is the synoptic diagram of a specific embodiment of Fig. 4 (or Fig. 5) digital simulation current converter circuit 34, just especially the part of digital simulation current converter 38, electric current storage replication module 42 and the control circuit 44 of Fig. 4 is extracted out and be illustrated especially, and be incorporated into data line 39, and the situation of the formerly described conversion memory phase of the embodiment of Fig. 6 representative.Digital simulation current converter 38 is Current Regulation formula (Current-Steering) digital simulation current converter 38 in Fig. 6 embodiment, has bigger output impedance, be not vulnerable to flow through the size of current of digital simulation current converter 38 and influence output voltage values, and control circuit 44 is to be electrically connected between digital simulation current converter 38 and the electric current storage replication module 42, but summary is considered as by two transistor T10, T11 constitutes, be used for receiving a switching signal SW, and digital simulation current converter circuit 34 switched between this conversion memory phase and another reproduction sustained period according to this switching signal SW.The electric current storage replication module 42 of present embodiment includes a capacitor C and a plurality of metal-oxide semiconductor (MOS) (Metal-Oxide Semiconductor, MOS) transistor or thin film transistor (TFT) (Thin FilmTransistor, TFT), wherein capacitor C promptly is used for storing the required predeterminated voltage of circulation analog current signal.Provide suitable external voltage source (Vdd for example, Vbias), current source (i, 2i ..., 2
N-1I), data inputs (D0, D1 ..., DN-1) and under the operating conditions such as ground connection, digital simulation current converter circuit 34 can be carried out its associative operation.
Please continue to consult Fig. 6, when the switching signal SW that receives when control circuit 44 is in a noble potential, digital simulation current converter circuit 34 is to be in the conversion memory phase, the digital signal that original process Fig. 4 (or Fig. 5) level shift circuit 32 amplifies is after Fig. 6 digital simulation current converter 38 is handled, output corresponding simulating current signal, and in this conversion memory phase, because switching signal SW is in noble potential, transistor T 11 turn-offs, control circuit 44 will cut off towards the path of data line 39, and transistor T 10 opening operations, that is control circuit 44 is connected the path between digital simulation current converter 38 and the electric current storage replication module 42, electric current storage replication module 42 (shown in the arrow Ic that represents direction of current among Fig. 6) is gone in the analog current signal conducting, this moment, analog current signal can flow through P-type mos transistor T and the capacitor C that links to each other with voltage Vdd and capacitor C in the electric current storage replication module 42, make the required predeterminated voltage of capacitor C storage circulation analog current signal, that is to say, in the present embodiment, the predeterminated voltage grid-source voltage of P-type mos transistor T (Vgs) for this reason.Please note, at first, electric current storage replication module 42 can metal oxide semiconductor transistor or thin film transistor (TFT) (Thin Film Transistor, TFT) constitute, that is, predeterminated voltage also can be the grid-source voltage of P type thin film transistor (TFT), in fact, electric current storage replication module 42 major technology in the present embodiment are characterised in that the specific voltage of preservation is required for the circulation analog current signal, therefore the combination of other various forms of transistor collocation capacitor C or circuit component also is included in the technical characterictic of present embodiment electric current storage replication module 42, certainly, along with different circuit component combinations, reach the switching of above-mentioned conversion memory phase, the switching signal SW that the control electricity is received just differs and is decided to be the described noble potential of present embodiment, must give corresponding adjustment.
When switching signal SW gets back to an electronegative potential, digital simulation current converter circuit 34 just is in the reproduction sustained period, the operational scenario of digital simulation current converter circuit 34 in reproducing sustained period sees also Fig. 7, Fig. 7 is the operation chart of Fig. 6 embodiment in reproducing sustained period, the function of element that Fig. 7 describes and coding are all identical with Fig. 6, main difference is after switching signal SW is transformed into electronegative potential by noble potential, transistor T 11 conductings operations, electric current storage replication module 42 can be in reproducing sustained period conducting one duplicate current signal to data line 39 (shown in the arrow Io that represents direction of current among Fig. 7).When whole digital simulation current converter circuit 34 is in the reproduction sustained period, control circuit 44 (the switching signal SW of received electronegative potential turn-offs transistor T 10) can will cut off between digital simulation current converter 38 and the electric current storage replication module 42, and the conducting duplicate current signal is to data line 39, to drive the pixel 40 that links to each other with data line 39.Duplicate current signal is produced by the predeterminated voltage that electric current storage replication module 42 had before been stored when changing memory phase, this is stored for analog current signal is required in response to circulation because of predeterminated voltage, so duplicate current signal is the almost equal analog current signal that is produced in original digital simulation current converter 38.Please note, described mode of operation in like manner during with leading portion conversion memory phase, because the combination of various forms of transistor collocation capacitor C or circuit component is included in the technical characterictic of electric current storage replication module 42 of the present invention, along with different circuit component combinations, reach the switching of above-mentioned reproduction sustained period, the current potential of the switching signal SW that control circuit 44 is received just must give corresponding adjustment.In addition, Fig. 6 is relative with direction of current among Fig. 7 embodiment, for example, digital simulation current converter circuit 34 described direction of current when reproducing sustained period are that data line 39 output current signals (serving as current source) are explained, if it is direction of current is reverse, also be about to the analogue current sources that digital simulation current converter circuit 34 of the present invention serves as a current sink (current sink), include equally in the middle of technical characterictic of the present invention, just on circuit design, just must do corresponding displacement and variation this moment, as partly metal oxide semiconductor transistor or the model of thin film transistor (TFT) exchange (the N type that must make some necessity in the circuit, the P type exchanges) etc.
Aforesaid data drive circuit is all corresponding to a pixel " one-level data drive circuit ", when reality is implemented, at first, not only pixel that " one-level data drive circuit " in the foregoing description is corresponding, but a plurality of pixels, that is one data line can link to each other with a plurality of pixels, moreover, data drive circuit of the present invention is as if the matrix form display (Matrix Display) that is applied to now, then must be finished with " multi-stage data driving circuit ", see also Fig. 8, Fig. 8 is the functional block diagram of the embodiment of data drive circuit of the present invention when practice.Fig. 8 embodiment has shown the structure of using a display element 60 of data drive circuit 50 of the present invention, and this display element 60 can be Organic Light Emitting Diode (OLED) display, organic macromolecular LED diode (PLED) display and other display systems by current drives.Include a shift register 56 in the display element 60, multi-stage data driving circuit 50, a plurality of pixels 70 (Pixel) corresponding to this multi-stage data driving circuit 50, and corresponding to the multi-strip scanning line (Scan Line) 68 of a plurality of pixels 70, a plurality of pixels 70 are that the mode with matrix is provided with arrangement, in fact, the technical characterictic of each data drive circuit 50 operation in this multi-stage data driving circuit 50 is all identical with earlier figures 4 to Fig. 7 embodiment, and each data drive circuit 50 all comprises a level shift circuit 52, one digital simulation current converter 58, one electric current storage replication module 62, an and control circuit 64.What should be specified is, at first, each pixel 70 is one to have the pixel 70 of electric current storage replication function, and switching signal SW not necessarily such as in the present embodiment by shift register 56 generation, also can produce by other relevant control module.The switching signal SW that is received when a certain control circuit 64 is in the electronegative potential, data drive circuit 50 corresponding to this control circuit 64 just is in the reproduction sustained period, switching signal SW can cut off the path that leads to digital simulation current converter 58 and will open towards the contactor of data line 69, should there be this moment a sweep trace to begin operation (current potential transfers noble potential to), the pixel 70 that sweep trace therewith links to each other is all opened, thus, the transistor that links to each other with the electric capacity that has predeterminated voltage in the electric current storage replication module 62 of this data drive circuit 50 (as the transistor T of Fig. 6 and Fig. 7 embodiment) can and be scanned the pixel 70 that line opens with data line 69 and go into a path, electric current storage replication module 62 can conductings one be slightly less than before the electric current of the analog current signal that converts from digital signal no better than or slightly, and this current signal will be injected in the continuous pixel 70.After sweep trace is turned off, because this pixel 70 is for having the pixel 70 of electric current storage replication function, pixel 70 equals or is proportional to the current signal that originally injected so can duplicate one by data line 69, make Organic Light Emitting Diode or the organic macromolecular LED diode relaying afterflow of current signal in pixel 70 logical, make Organic Light Emitting Diode or organic macromolecular LED diode can continue to keep corresponding brightness, in this pixel corresponding scanning line 68 is opened again next time.
The embodiment of Fig. 8 is when practical operation, level shift circuit 52 that each data drive circuit 50 tunnel comprised or latch 14 can change into and being arranged on outside the data drive circuit 50, and allow multi-stage data driving circuit 50 a shared level shift circuit 52 or latchs, see also Fig. 9, Fig. 9 is the functional block diagram of another embodiment of the structure of Fig. 8 display element 60.The function of element that Fig. 9 describes and coding are all identical with Fig. 8, unique difference is seated in level shift circuit 52 before the multi-stage data driving circuit 50 for Fig. 9 embodiment, in fact, the number of level shift circuit 52 (or latch) need not limit, even level shift circuit 52 (or latch) removed in system also be included in the technical characterictic of the present invention, just under the situation of the current potential that does not have level shift circuit 52 (or latch) adjustment digital signal, digital signal is to import in the data drive circuit 50 with the pattern of large amplitude signal.
A data drive circuit of the present invention has comprised Current Regulation formula (Current-Steering) digital simulation current converter, and utilize and install an electric current storage replication module and corresponding control circuit, it is possessed electric current storage and copy function are arranged, can be at a conversion memory phase stored one predeterminated voltage, and reproduce the stable gray scale electric current of conducting in the sustained period one one.
The above only is the preferred embodiments of the present invention, and all equivalences of being made according to claim receipts of the present invention change and revise, and all should belong to covering scope of the present invention.
Claims (19)
1. data drive circuit that is used for the display element of a current drives, it is to be used for receiving a digital signal and to export a gray scale current signal to drive a data line of this display element, this data drive circuit includes:
One digital simulation current converter is used for received digital signal is converted to an analog current signal;
One electric current storage replication module is used at a conversion memory phase stored required predeterminated voltage of this analog current signal that circulates, and reproduces in the sustained period conducting one duplicate current signal to this data line one; And
One control circuit is electrically connected between this digital simulation current converter and this electric current storage replication module, is used for switching between this conversion memory phase and this reproduction sustained period;
Wherein this duplicate current signal is this gray scale current signal, and this duplicate current signal is almost equal in this analog current signal;
Wherein this electric current storage replication module only comprises at least one electric capacity and a plurality of metal oxide semiconductor transistor or thin film transistor (TFT).
2. data drive circuit as claimed in claim 1, wherein this duplicate current signal is produced by this predeterminated voltage.
3. data drive circuit as claimed in claim 1, it comprises at least one level shift circuit in addition, is used for adjusting the current potential of this digital signal.
4. data drive circuit as claimed in claim 1, it comprises at least one latch in addition, is used for latching this digital signal.
5. data drive circuit as claimed in claim 1, it comprises a shift register in addition, is used for exporting a switching signal to this control circuit, and this data drive circuit is switched between this conversion memory phase and this reproduction sustained period.
6. data drive circuit as claimed in claim 5, wherein when this switching signal is in a noble potential, this data drive circuit is to be in this conversion memory phase, this control circuit can will be connected between this digital simulation current converter and this electric current storage replication module, this electric current storage replication module is gone in this analog current signal conducting that this digital simulation current converter is produced, and this electric current storage replication module can be stored this required predeterminated voltage of this analog current signal of circulation.
7. data drive circuit as claimed in claim 6, wherein, this predeterminated voltage is a transistorized grid one source pole voltage (Vgs) that comprises in the described electric current storage replication module.
8. data drive circuit as claimed in claim 5, wherein when this switching signal is in an electronegative potential, this data drive circuit is to be in this reproduction sustained period, this control circuit can will cut off between this digital simulation current converter and this electric current storage replication module, and this duplicate current signal of conducting is to this data line.
9. data drive circuit as claimed in claim 1, wherein this digital simulation current converter is a Current Regulation formula digital simulation current converter or other digital simulation current converters.
10. data drive circuit as claimed in claim 1, wherein this display element is an Organic Light Emitting Diode (OLED) display, organic macromolecular LED diode (PLED) display and other are with one in the display system of current drives.
11. a data drive circuit that is used for the display element of a current drives, it is to be used for the data line that receives a digital signal and drive this display element, and this data drive circuit includes:
At least one level shift circuit is used for adjusting the current potential of the digital signal of this reception;
One Current Regulation formula digital simulation current converter is electrically connected to this level shift circuit, is used for this digital signal is converted to an analog current signal;
One electric current storage replication module, be used at a conversion memory phase stored required predeterminated voltage of this analog current signal that circulates, and conducting one duplicate current signal is to this data line in a reproduction sustained period, and wherein this duplicate current signal is produced by this predeterminated voltage; And
One control circuit is electrically connected between this digital simulation current converter and this electric current storage replication module, is used for switching between this conversion memory phase and this reproduction sustained period;
Wherein this duplicate current signal is almost equal in this analog current signal; And
Wherein this electric current storage replication module only comprises at least one electric capacity and a plurality of metal oxide semiconductor transistor or thin film transistor (TFT).
12. data drive circuit as claimed in claim 11, it comprises at least one latch in addition, is used for latching this digital signal.
13. data drive circuit as claimed in claim 11, it comprises a shift register in addition, is used for exporting a switching signal to this control circuit, and this data drive circuit is switched between this conversion memory phase and this reproduction sustained period.
14. data drive circuit as claimed in claim 13, wherein when this switching signal is in a noble potential, this data drive circuit is to be in this conversion memory phase, this control circuit can will be connected between this digital simulation current converter and this electric current storage replication module, this electric current storage replication module is gone in this analog current signal conducting that this digital simulation current converter is produced, and this electric current storage replication module can be stored this required predeterminated voltage of this analog current signal of circulation.
15. data drive circuit as claimed in claim 14, wherein, this predeterminated voltage is a transistorized grid-source voltage (Vgs) that comprises in the described electric current storage replication module.
16. data drive circuit as claimed in claim 13, wherein when this switching signal is in an electronegative potential, this data drive circuit is to be in this reproduction sustained period, this control circuit can will cut off between this digital simulation current converter and this electric current storage replication module, and this duplicate current signal of conducting is to this data line.
17. data drive circuit as claimed in claim 16, wherein this display element comprises in addition corresponding to a plurality of pixels of this data line and corresponding to the multi-strip scanning line of these a plurality of pixels, when this data drive circuit is when being in this reproduction sustained period, at least one sweep trace can make the pixel corresponding to this sweep trace begin operation, makes this this duplicate current signal of data line conducting in the pixel corresponding to this data line.
18. data drive circuit as claimed in claim 17, wherein each pixel is one to have the pixel of electric current storage replication function.
19. data drive circuit as claimed in claim 11, wherein this display element is an Organic Light Emitting Diode (OLED) display, organic macromolecular LED diode (PLED) display and other are with one in the display system of current drives.
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| JP2002351404A (en) * | 2001-03-22 | 2002-12-06 | Semiconductor Energy Lab Co Ltd | Driving method for display device |
| CN1391201A (en) * | 2001-06-07 | 2003-01-15 | 株式会社日立制作所 | Imaging display panel and imaging observation device therewith |
-
2003
- 2003-04-01 CN CNB031090125A patent/CN100353391C/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967140A (en) * | 1988-09-12 | 1990-10-30 | U.S. Philips Corporation | Current-source arrangement |
| US6222357B1 (en) * | 1998-09-07 | 2001-04-24 | Canon Kabushiki Kaisha | Current output circuit with controlled holdover capacitors |
| JP2000245002A (en) * | 1999-02-24 | 2000-09-08 | Matsushita Electric Ind Co Ltd | Remaining battery capacity detector for electric automobile |
| CN1339773A (en) * | 2000-08-18 | 2002-03-13 | 株式会社半导体能源研究所 | Liquid crystal display and driving method for portable information device including it |
| US20020036604A1 (en) * | 2000-08-23 | 2002-03-28 | Shunpei Yamazaki | Portable information apparatus and method of driving the same |
| JP2002351404A (en) * | 2001-03-22 | 2002-12-06 | Semiconductor Energy Lab Co Ltd | Driving method for display device |
| CN1391201A (en) * | 2001-06-07 | 2003-01-15 | 株式会社日立制作所 | Imaging display panel and imaging observation device therewith |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1534564A (en) | 2004-10-06 |
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