CN102177487A - Active matrix display and method - Google Patents
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- CN102177487A CN102177487A CN2007800508888A CN200780050888A CN102177487A CN 102177487 A CN102177487 A CN 102177487A CN 2007800508888 A CN2007800508888 A CN 2007800508888A CN 200780050888 A CN200780050888 A CN 200780050888A CN 102177487 A CN102177487 A CN 102177487A
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Abstract
An active matrix display includes at least one data driver circuit comprising a column data line and a parallel column current line; a plurality of pixels connected in series to both the column data line and the parallel column current line comprising at least one pixel that is responsive to the column data line to drive a selected pixel current to the at least one pixel; and a loopback control circuit at the head of the column and external to the plurality of pixels that senses a voltage difference between an input column current in the current line and a voltage of a load drawing on the current line and that adjusts a data programming voltage according to the difference.
Description
Technical field
The present invention relates to a kind of Active Matrix Display and the method that is used for driving display.
Background technology
Active Matrix Display is formed by the many light emitting members that are called as pixel.Each pixel comprises the electronic circuit that is used to control light emitting diode.Laying out pixel in the array of row and column is so that form display.In operation, utilize new data value more to come each pixel order ground programming to array, described more new data value is converted into optical power level.
In typical 2-TFT pixel, adopt voltage form that the data value of determining light intensity is provided from the outside.Described voltage is transformed to the electric current that is drawn towards Organic Light Emitting Diode (OLED) by image element circuit.The magnitude of current is determined the light quantity of diode emission.When OLED was programmed, thin film transistor (TFT) (TFT) sent to another transistorized grid with data value voltage from line program, and described transistor is used to regulate the electric current that flow to OLED from power supply.
Flow through the transistorized electric current of Current Regulation and depend on voltage at its grid.Factor such as the transistor material attribute has direct influence to flowing through transistorized electric current.The variation of transistor material attribute (mismatch) may produce different electric currents to the voltage level of two identical programmings of different pixels.This produces difference subsequently in light output.The various pixel design of having advised the number and so on by increasing transistor and control line solve this problem.Yet these designs are to reduce yield rate and aperture than the labyrinth under the situation.
Need a kind of Active Matrix Display, comprise having the conforming pixel driver of improved output, described pixel driver utilizes minimum transistor, avoids complicated image element circuit and can promptly be programmed.
Summary of the invention
The invention provides a kind of Active Matrix Display with display driver control circuit, it generates the height consistance under the situation that does not increase the display pixel complexity.
The present invention can be described to display, comprising: a plurality of pixels and the data line, selection wire and the electric current line that are used for described pixel, and at least one pixel comprises the circuit with at least two thin film transistor (TFT)s, capacitor and light emitting diode; With the circuit outside described a plurality of pixels, it regulates the voltage of described data line according to the electric current that is drawn into display from power supply signal.
In one embodiment, the present invention is an Active Matrix Display, comprising: at least one data driving circuit comprises column data line and row electric current line; Be connected to a plurality of pixels of described column data line and row electric current line, comprise at least one pixel, it responds to column data line voltage, so that to described at least one pixel drive pixel current; And at described column data line and row electric current thread end and the loopback circuit outside described a plurality of pixels, the voltage of pixel current that its sensing drives and regulate the programme voltage of the pixel current regulated of column data line voltage, so as with the outside reference currents match.
In another embodiment, a kind of method that is used to drive Active Matrix Display comprises: sensing is by the voltage difference between the voltage of first source current of the voltage of electric current that programmed pixels is drawn and described Active Matrix Display; And regulate the data programing voltage of described display picture element according to described voltage difference; Wherein said sensing and adjusting are implemented by end and the loopback control circuit outside the pixel at described row at pixel column, and described pixel column comprises described pixel.
In another embodiment, a kind of Active Matrix Display, comprise: be disposed in a plurality of AMOLED pixels in rectangular array and the row, wherein each pixel column is connected to shared electric current line and data shared voltage source, and each pixel column is connected to shared selection wire, wherein said at least one pixel comprises: current drive transistor has drain/source, grid and is connected to the source/drain of described row electric current line; Address transistor has the source/drain of the grid that is connected to described driving transistors and is connected to the drain/source of described column data line; Selection wire is connected to the grid of described address transistor; And OLED, be connected to the drain/source of described current drive transistor; Wherein said a plurality of AMOLED pixel is connected to the loopback control circuit outside at least one row end and a plurality of pixels at these row, the voltage of the pixel current that described loopback control circuit sensing is driven and regulate the programme voltage of the pixel current regulated of column data line voltage, so as with the outside reference currents match.
In another embodiment, the present invention is a data driving circuit, comprising: at least one column data line; At least one row electric current line in parallel; Be connected in series to a plurality of pixels of at least one column data line and corresponding row electric current line in parallel, comprise at least one pixel, it responds to described column data line so that to described at least one pixel drive pixel current; And in the row end of data line and electric current line and the loopback control circuit outside a plurality of pixels of row, be used for sensing the voltage of the first input data current and between the voltage of the load on the described electric current line voltage difference, and regulate the input data current according to described voltage difference.
In another embodiment, a kind of method that is used to drive Active Matrix Display comprises: (A) to being used to represent that the initial current of the first programming data value from the power supply to the Active Matrix Display samples; (B) store the first identical program voltage data value and apply the described first program voltage data value at second capacitor circuit to selected image element circuit; (C) draw electric current according to next voltage data value, the result who changes as pixel property deducts described next voltage data value from the first program voltage data value that is applied; (D) voltage of electric current that sensing draws and it is compared with the initial current voltage of signals of being sampled; (E) according to the described new program voltage data value that relatively the described first program voltage data value is adjusted at the second capacitor place; (F) apply described new program voltage data value to selected pixel; And (G) repetition (B) is identical with the voltage of the initial current of being sampled up to the program voltage data value of the storage of being compared to (F).
Description of drawings
Fig. 1 is the diagram of display circuit;
Fig. 2 is the synoptic diagram of display circuit;
Fig. 3 is the diagram of display circuit;
Fig. 4 and Fig. 5 are at the electric current at pixel place with at the chart of the electric current at driver place;
Fig. 6 and Fig. 8 are used to illustrate the chart that concerns between electric current and the data;
Fig. 7 and Fig. 9 are the charts as the percentage of current mismatch of data function; And
Embodiment
The brightness of AMOLED display depends in part on the electric current by the OLED element.For the pixel of voltage-programming,, each image element circuit in the AMOLED element is programmed for drives desired electric current by applying voltage to circuit transistor or for current programmed pixel, applying electric current by circuit transistor to the difference configuration.
In the voltage-programming display, voltage is based on transistorized large-signal mutual conductance, is used to represent the numerical value of electric current output and voltage input ratio to the conversion of electric current.The OLED element current changes with the transistorized mutual conductance of image element circuit.The factor such as transistor mobility is depended in mutual conductance, and described transistor mobility strides across display and may change thus in display and produce inconsistent from a display to another display.In addition, the pixel of voltage-programming may be very sensitive to transistor threshold voltage, and described transistor threshold voltage strides across display and also may change to another display from a display.
The present invention relates to a kind of data driving circuit, compare the performance of its complexity that reduces the active matrix base plate and improvement AMOLED with more complicated consistent aligning gear.Driver is the programmed circuit or the instruction sequence of control display.In one embodiment, the invention provides a kind of data driver of the 2-TFT of being used for pixel, it is not needing to increase the consistance that obtains height under the situation of pixel transistor or control line number.Data driver is operated in by data line in each row or a plurality of row and the formed backfeed loop of electric current line.Commutation circuit is distinguished single pixel current mutually with all the other the row electric currents in the electric current line.Then, current sensing circuit Control and Feedback loop, described backfeed loop is that the data line charging is up to reaching desired pixel current level.
Feature of the present invention will become apparent with following detailed argumentation with reference to the accompanying drawings, and it only is to be not limited to describe the preferred embodiments of the present invention for example.In the accompanying drawings, same structure is identified by identical Reference numeral.
Fig. 1 is the diagram of the AMOLED display circuit 10 of being advised.Circuit 10 comprises a plurality of pixels 12 that are arranged as matrix array.Fig. 1 shows 3 * 3 matrixes that only are used to represent AMOLED, and it can be formed by thousands of light emission pixels 12.3 * 3 matrixes are shown as including row A, B and C and row R, S and T.Between the intersection point of pixel selection line 26 and a pair of column data line 16 and row electric current line 18, each pixel 12 is set.Each pixel 12 comprises the electronic circuit of controlling light emitting diode 14.
Each row comprises data line 16 and electric current line 18, and each image element circuit comprises transistor M120, transistor M222 and holding capacitor 24. Transistor 20 and 22 is three terminal device (grid, drain electrode and source electrodes), and it can be worked in two ways: the switch that passes through with the form of voltage as permission information, or flow through the vario valve of the magnitude of current as control.In each pixel 12, transistor M120 is a current drive transistor, has the drain/source that is connected to row electric current line 18, is coupled to the source/drain of diode 14 and is coupled to the grid of the source electrode of transistor M222.Address transistor M222 have the grid that is connected to driving transistors M120 source/drain, be connected to the drain/source of column data line 16.Address transistor M222 plays switch; When switch conduction, the voltage in its drain electrode passes to source electrode; When switch turn-offs, do not allow to transmit any voltage.Transistor M120 plays variable valve, and described variable valve can come flowing of Control current according to the state of its grid.By universal law, the voltage on the grid of transistor M120 has determined to flow through the electric current (flow into drain electrode and flow out source electrode) of device.
When utilizing the row of new information updating pixel A, B or C, data line 16 provides data value with voltage form.Once finish delegation, each pixel 12 in row provides its corresponding data values simultaneously.Voltage is transformed to electric current by transistor M120 and provides by electric current line 18.Described electric current is drawn towards light emitting diode, and the magnitude of current has been determined luminous quantity.Be written in the pixel to the delegation of data of AMOLED, but diode is operated with 100% duty cycle basically.This is by providing memory circuit to realize to each pixel that combination provided via transistor 22 and capacitor 24.
In operation, selection wire 26 by pulse excitation so that select pixel 12.Transistor M222 is by selection wire 26 pulse activations and forward conduction position (shown in Fig. 3) to.In the display of routine, when selected pixel being charged to burning voltage, draw new electric current I from row electric current line 18 by line program 16.Owing to do not select any other pixel 12, so new electric current I flows through selected pixel.
Flow through the voltage that transistorized electric current depends on its grid.Yet significant change may take place in the transistorized material properties that forms pel array when striding across the viewing area.These factors produce inconsistent intensity level.Thereby even if having the voltage level of identical programming, light output also is different for two different pixels.Variation in the pixel property may cause mismatch at the entire equipment display.
The invention provides a kind of external control circuit that is used for display.Described being controlled at obtains the height consistance under the situation that does not increase the display pixel complexity.The present invention can cause having higher aperture opening ratio (brighter display), lower OLED operating voltage, lower power consumption, higher output and the display of low production cost more.Driver of the present invention can adopt the IC of standard to realize or be integrated on the panel identical with active backplane, has further reduced the demonstration cost.
Fig. 2 diagram illustrates the external control circuit of the present invention 28 of connecting inner pixel 12 balances.The internal circuit of pixel 12 comprises transistor 20 and 22 and light emitting diode 14.External control circuit 28 is operated in the data line 16 of each display circuit row (for example A) end and electric current line 18 formed backfeed loops.In Fig. 2 and Fig. 3, external control circuit 28 comprises the source/sensing module 30 of binding data programming module 32.
In operation, source/sensing module 30 is distinguished single pixel current mutually with all the other the row electric currents in the electric current line 18, and controls the internal feedback loop and come control programming module 32, so that obtain the pixel current of target level.Because current sense and be controlled at driver row end rather than pixel 12 in the execution, so the mismatch properties of pixel transistor 20,22 is not an adverse factor.In addition, all pixels because the identical external control circuit 28 of use is programmed in the particular column are minimized so pixel current changes.
Fig. 3 is the schematic circuit according to a display of the present invention, comprises external control circuit 28.In this application, " external control circuit " means the control circuit of being correlated with or connecting in the pixel outside of array.For example, external control circuit can be positioned at display circuit, in the end of pixel column.In array, each pixel column can with its independently external control circuit be associated.In Fig. 3, source/sensing module 30 comprises transistor MSource 34, transistor MSense 36 and amplifier Amp 138.Transistor MSource 34 is transistors that electric current is provided with low-voltage; Transistor MSense 36 is transistors that the sensing Weak current changes; Amplifier Amp 138 these two transistors 34,36 of control.Fig. 3 shows the single source/sensing module 30 that has data programing module 32 in conjunction with single display column.Yet as top pointed, each the end associated source/sensing module 30 in a plurality of row of display matrix and the combination of data programing module 32.
Current source/sensing module 30 of Fig. 3 provides a kind of control gear by amplifier Amp138, transistor MSense 36 and Msource34.Amplifier Amp138 has three terminals; Be labeled as the lead-out terminal 50 of the grid of two voltage input end 46,48 of '+' and '-' and oxide-semiconductor control transistors MSense 36 and transistor MSource 34.Input terminal 46 is connected to constant impressed voltage Vcol.Input terminal 48 is connected to node nc 44.Except that the little variation during programming, it is constant that node nc 44 remains on voltage Vcol.When switch MS 1 40 conductings, set up the grid voltage of transistor MSense 36 and transistor MSource 34 by the electric current that flows through transistor MSense 36 and Msource 34 in response to electric current line 18.When line 18 began to draw more multiple current, the voltage of node nc 44 and corresponding input terminal 48 changed.Thereby in response to the change in voltage of any node nc 44, amplifier Amp138 regulates the grid voltage of MSense transistor 36 and Msource transistor 34, so that regulate the current/voltage by transistor MSense 36 and Msource 34.What caused changes the grid of transistor MSense 36 and Msource 34 in the change in voltage of lead-out terminal 50, up to by these two electric currents that transistor provided and the currents match of being drawn.
Change in voltage at the grid of transistor MSense 36 is directly relevant with transistorized size.Bigger transistor can produce grid voltage and change very little more multiple current.On the other hand, less transistor can be controlled its output current more accurately by requiring the big change in voltage (in for electric current given little variation) at its grid.
In current source/sensing module 30 of Fig. 3, can customize bigger transistor MSource 34 and less transistor MSense 36, so that satisfy special display requirement.They connect by switch MS140 and are controlled by amplifier Amp138.Display column of element ' A ' expression.When the operation beginning, switch MS140 conducting and most of row electric current flow through megacryst pipe MSource 34 (in this, not having electric current to flow through selected pixel).When switch MS140 turn-offed, the voltage in the grid of megacryst pipe MSource 34 kept constant via capacitor CS 142, thus, also keeps constant by the electric current that is provided than megacryst pipe MSource 34.This operation is considered to the row current sample by transistor MSource 34.
The data programing module 32 of Fig. 3 is connected to current source/sensing module 30.Data programing module 32 comprises amplifier Amp2 52 and a series of switch.Amplifier Amp2 52 has an input end 54 that is connected to capacitor CS2 60 and another input end 56 that is connected to the grid of MSense transistor MS1 36.Another lead-out terminal 58 is connected to the data line 16 of row A.In second sampling period, the voltage at the grid place of 62 pairs of less MSense transistors 36 of switching transistor MS2 is sampled and it is stored in (this is provided with and is used for representing the main level of row electric current and will using in comparison step after a while) among the capacitor CS2 60.In this stage, current source/sensing module 30 is in the variation of the row electric current among wait/sensing modes and the MSense 36 senses flow ingress nc 44.Amplifier Amp2 52 can correspondingly regulate the voltage of the grid of MSense transistor 36.
During programming cycle, data line 16 is connected to the grid of transistor M1 20 by transistor M2 22.Transistor M1 20 is connected to node nc 44 all the time.This configuration provides backfeed loop by electric current line 18 and data line 16 at node nc 44 places, and described backfeed loop comprises current source/sensing module 30, data programing module 32 and pixel transistor M1 20.When external data electric current I data 64 injects node nc 44, following process takes place: (i) changed the grid voltage of MSense 36 by Amp138, so that hold the electric current that node nc 44 draws in backfeed loop; (described electric current is sensed); (ii) the negative input voltage of Amp2 52 with respect to positive input end 54 change voltage with the lead-out terminal 58 that increases Amp2 (with injection current with compare by the electric current of transistor M1 20; It is initially null value); (iii) change the voltage (regulating data line 16) of the grid of transistor M120 according to comparing difference from the output (being connected to data line 16) of Amp2; And (iv) correspondingly increase by the electric current that node nc 44 is drawn by transistor M1 20.Repeat (i) and wherein mate ((ii) not sensing any difference) by node nc 44 electric current that is drawn and the data current Idata 64 that is injected up to reaching balance in comparison step by transistor M1 20 to (iv) process.By electric current that M120 drew and the currents match of being injected, make two terminals, 56,54 balances of Amp2 52.When balance, the voltage at the grid place of MSense 36 turns back to original value.Backfeed loop reaches balance so that provide correct value to pixel current.
Following example is illustrative and should be interpreted as restriction to the claim scope, unless clear and definite especially restriction.
Example
For purposes of this application, transistorized mobility is the device attribute that quantizes to determine the magnitude of current that the transistor of size can provide.In other words, for given grid voltage, the magnitude of current that is flow through is the function (together with other factors) of its mobility.For example, if apply identical voltage at two transistorized grids of identical size, but one has high 20% mobility, and then the transistor of high mobility will provide many 20% electric current (all other factorses are identical).Mobility is the function that material properties and device are made, and for the technology that is used to make display, it may change in whole viewing area.
For all purposes of the application, transistorized threshold voltage is to make electric current flow through desired minimum voltage at transistor gate.Threshold voltage is the function that material properties and device are made, and thereby threshold voltage may change in whole viewing area.
Example 1
Utilize
Computer software comes the executive circuit simulation.
Be to be used to simulate and the computer software of hybrid analog-digital simulation/digital circuit simulation, and provide by EMA design automation company (NY 14692 for PO Box 23325, Rochester) by ORCAD company (CA 95134 for 2655Seely street, San Jose).
Software is accepted user's input circuit synoptic diagram and transistor model and address information and generation analog response.
Circuit diagram is that simulation is used for basically being complementary with the circuit of Fig. 2 and Fig. 3
At the signal shown in Fig. 4 is the control signal that activates the different switches in the display driver, particularly is controlled at MS1, MS2 in the pixel that just is being programmed and the voltage signal of transistor M2.Fig. 5 output map represent as the function of time by institute's programmed pixels electric current and as the data current (being fed to the Idata 64 of the node nc of display driver) of the function of time.
The simulation system variable comprises following content: (1) all row electric currents, the summation of all pixel currents in given row, from 150 μ A to 3500 μ A; (2) the pixel data electric current changes to 20 μ A from 0.3 μ A; (3) change pixel transistor M1 according to different sizes, so that simulation is up to 25% mobility change; And (4) change the pixel transistor threshold voltage by the grid that voltage source is connected to M1, so that analog threshold voltage is up to 50% variation.
The curve of Fig. 5 shows how matched data electric current of pixel current.Carry out this simulation so that display driver is shown under several system conditions, described display driver is carried out desired operation for the scope of condition.
Fig. 5 shows the display driver of being advised desired current level is programmed in the pixel of being planned under above-mentioned all system variables.Analog result shows that this circuit can be proofreaied and correct according to desired operating speed and electric current demand utilization current mismatch and carries out address pixels.Can also from analog result, extract the qualitative representation of accuracy.
Example 2
Following example is used for the programming of the data current of the display pixel with driving transistors M1 being compared with different attributes and showing this function at different row current levels.
In monocrystalline silicon integrated circuit (IC), make the display driver that is used for display column.Described row also comprise the test pixel circuit of realizing with IC.Except that the transistorized size of M1, the test pixel circuit is manufactured to has identical attribute.Two pixels are manufactured to has 20% difference in size on the width of M1, so that simulate 20% mobility difference.For analog threshold voltage changes, outside v voltage source is connected to pixel.This voltage source represents that 25% of transistor M1 threshold value changes.
In this process, use
Computer software applies circuit voltage.
Computer software is used for controlling and simulation science and engineering tools and detection system, and carries out measuring ability.In first process, establish voltage level in the line program of each in two pixels, described voltage level is transformed to electric current by M1 then.Change following condition and prove performance: (1) all row electric currents become 3000 μ A from 150 μ A; (2) the pixel data electric current becomes 15 μ A from 0.5 μ A; (3) by changing the mobility that 20% size nearly changes pixel transistor M1; And (4) change the threshold voltage of pixel transistor M1 by the voltage source of introducing nearly 25% variation.
Fig. 6 shows the electric current that flows through these two pixels when programming two pixels (Pix1 and Pix2) according to the typical prior art mode.Fig. 6 shows the threshold voltage that has improved 25% (Pix1) and has improved the mobility of 20% (Pix2).For example at low data level, Pix1 provides about 2.5 μ A; Yet at identical data level, Pix2 provides about 4 μ A.This difference may cause luminance difference occurring in display, even if two pixels are intended to have identical intensity level (as identical data level is planned).
The curve representation of Fig. 7 changes as the standardization number percent of function between two pixels of data voltage.
Fig. 6 and Fig. 7 show the electric current change degree with the M1 attribute change.
Fig. 8 shows the electric current that still utilizes the display driver programming of Fig. 3 by two identical pixels.Even if Fig. 8 shows also Perfect Matchings of two electric currents that attribute produced that transistor M1 has a change.The standardization number percent curve of Fig. 9 only shows the measurement tolerance variations between two pixel currents.
Experimental data shows that inconsistency reduces to below 3% from 70% for two pixels utilizing standard technique driving and adjusting driver of the present invention respectively.This consistency level has improved an order of magnitude in spreading all over whole data area.In addition, simulation shows and can will programme time decreased below typical prior art current copy pixel required time.
Data driver of the present invention can be realized with the IC of standard or realize on the panel identical with active backplane.For the driver of being advised, poly-silicon TFT provides good compromise between performance and cost.
Circuit of the present invention is by providing the consistent level with the complexity that is lower than the typical prior art alignment technique to reduce the complexity of active matrix base plate in conjunction with two transistor T FT pixels.And owing to reduced the transistorized performance requirement on the base plate, so can use the technology of lower cost for big area array.
Though described the preferred embodiments of the present invention, can change and modification the present invention, so the present invention should not be limited to the fine detail of example.The present invention includes the variation and the replacement that drop in the following claim scope.
Claims (35)
1. display comprises:
A plurality of pixels and the data line, selection wire and the electric current line that are used for described pixel, at least one pixel comprises the circuit with at least two thin film transistor (TFT)s, capacitor and light emitting diode; And
Circuit outside described a plurality of pixels, it regulates the voltage of described data line according to the electric current that is drawn into described display from power supply signal.
2. display as claimed in claim 1 also comprises:
At least one data driving circuit comprises column data line and row electric current line; And
Be connected to a plurality of pixels of described column data line and row electric current line, comprise at least one pixel, it responds to described column data line, so that selected pixel current is programmed into described at least one pixel.
3. display as claimed in claim 1 also comprises:
At least one data driving circuit comprises column data line and row electric current line; And
Be connected to a plurality of pixels of described column data line and row electric current line, comprise at least one pixel, it responds to described column data line, so that selected pixel current is programmed into described at least one pixel;
Wherein, be included in described row end and the loopback circuit outside described a plurality of pixels at the circuit outside described a plurality of pixels, selected pixel current of its sensing and the adjusting column data line voltage selected pixel current of programming, so as with the external data currents match.
4. display as claimed in claim 1 also comprises:
At least one data driving circuit comprises column data line and row electric current line; And
Be connected to a plurality of pixels of described column data line and row electric current line, comprise at least one pixel, it responds to described column data line, so that selected pixel current is programmed into described at least one pixel;
Wherein, circuit outside described a plurality of pixels is sampled to the row electric current, and the selected pixel current of sensing is compared selected pixel current with the external data electric current, and regulate column data line voltage, so that according to the difference selected pixel current of programming.
5. display as claimed in claim 1 also comprises:
At least one data driving circuit comprises column data line and row electric current line; And
Be connected to a plurality of pixels of described column data line and row electric current line, comprise at least one pixel, it responds to described column data line, so that selected pixel current is programmed into described at least one pixel;
Wherein, circuit outside described a plurality of pixels is sampled to the row electric current, the selected pixel current of sensing, selected pixel current is compared with the external data electric current, and regulate the column data line program voltage according to difference, and repeat the loopback circuit operation, up to sensing when the current level of institute's sensing is compared with the external data current level less than difference.
6. display as claimed in claim 1 also comprises:
At least one data driving circuit comprises column data line and row electric current line; And
Be connected to a plurality of pixels of described column data line and row electric current line, comprise at least one pixel, it responds to described column data line, so that selected pixel current is programmed into described at least one pixel;
Wherein, described row electric current line is connected to the source/drain of pixel current driving transistors, and described column data line is connected to the transistorized source/drain of pixel address.
7. display as claimed in claim 1 also comprises:
At least one data driving circuit comprises column data line and row electric current line; And
Be connected to a plurality of pixels of described column data line and row electric current line, comprise at least one pixel, it responds to described column data line, so that selected pixel current is programmed into described at least one pixel;
And comprise a plurality of loopback circuit, each loopback circuit is outside a plurality of pixels and include column data line and row electric current line, is used to each pixel order ground of described column data line and row electric current line to regulate data programing voltage.
8. Active Matrix Display comprises:
At least one data driving circuit comprises column data line and row electric current line;
Be connected to a plurality of pixels of described column data line and row electric current line, comprise at least one pixel, it responds to described column data line voltage, so that pixel current is driven into described at least one pixel; And
At described column data line and row electric current thread end and the loopback circuit outside described a plurality of pixels, the voltage of the pixel current that its sensing drove and regulate the programme voltage of the pixel current regulated of column data line voltage, so as with the outside reference currents match.
9. Active Matrix Display as claimed in claim 8, wherein, described loopback circuit is sampled to the electric current from power supply, the pixel current that sensing drove, the pixel current that is driven is compared with the outside reference electric current, and regulate column data line voltage according to difference, to drive the pixel current of being regulated.
10. Active Matrix Display as claimed in claim 8, wherein, described loopback circuit is sampled to the electric current from power supply, the pixel current that sensing drove, the pixel current that is driven is compared with the outside reference electric current, and regulate column data line voltage driving the pixel current regulated according to difference, and repeat the loopback circuit operation, up to sensing when the pixel current that will be driven is compared with the outside reference electric current less than any difference.
11. Active Matrix Display as claimed in claim 8, wherein, described row electric current line is connected to the source/drain of pixel current driving transistors, and described column data line is connected to the transistorized source/drain of pixel address.
12. Active Matrix Display as claimed in claim 8, wherein, described loopback circuit is associated with a plurality of data driving circuits, each data driving circuit comprises column data line and row electric current line, is used to each pixel order ground of described column data line and row electric current line to regulate data programing voltage.
13. Active Matrix Display as claimed in claim 8, wherein, described loopback circuit also comprises comparer and regulator, described comparer is compared the voltage relevant with the driving pixel current level that is drawn with the outside reference current level of being stored, described regulator is according to the described voltage of relatively regulating described column data line.
14. Active Matrix Display as claimed in claim 8, wherein, described loopback control circuit comprises the current source sensing module, and described current source sensing module is to sampling to the pixel current of described loopback control circuit from described row electric current line.
15. Active Matrix Display as claimed in claim 8, wherein, described loopback control circuit comprises the data programing module, described data programing module is repeatedly to comparing from the data voltage of the variation of first addressed pixel circuits and the pixel current voltage of being sampled, and regulate described column data line voltage, the voltage after changing is identical with the pixel current voltage of being sampled.
16. Active Matrix Display as claimed in claim 8, wherein, described loopback control circuit comprises the current source sensing module, it comprises amplifier, the lead-out terminal that described amplifier has input terminal that is connected with constant voltage source and the input terminal that is connected with source transistor and switchably is connected to the grid of source transistor and sensing transistor, wherein, when switch conduction, described amplifier activates described source transistor, so that the row electric current is sampled, perhaps when switch turn-offs, in response to the voltage of regulating in the differences among voltages of the current/voltage of source transistor and outside reference data circuit on the described sensing transistor.
17. Active Matrix Display as claimed in claim 8, wherein, described loopback control circuit comprises the data programing module, described data programing module comprises the amplifier that is connected between source transistor and the sensing transistor, and in response to regulating row line program voltage in source transistor voltage and the sensing transistor differences among voltages of being regulated.
18. Active Matrix Display as claimed in claim 8, wherein, described loopback control circuit comprises:
The current source sensing module, it comprises amplifier, the lead-out terminal that described amplifier has input terminal that is connected with constant voltage source and the input terminal that is connected with source transistor and switchably is connected to the grid of source transistor or sensing transistor, wherein, when switch conduction, described amplifier activates described source transistor, so that the row electric current is sampled, perhaps when switch turn-offs, in response to the voltage of regulating in the differences among voltages of the current/voltage of source transistor and outside reference data circuit on the described sensing transistor; And
The data programing module, it comprises the amplifier that is connected between source transistor and the sensing transistor, and in response to regulating row line program voltage in source transistor voltage and the sensing transistor differences among voltages of being regulated.
19. Active Matrix Display as claimed in claim 8, wherein, described at least one pixel comprises light emitting diode and two transistors that are connected to ground.
20. Active Matrix Display as claimed in claim 8 wherein, is provided with pixel between each intersection point of pixel selection line and a pair of column data line and row electric current line.
21. Active Matrix Display as claimed in claim 8 wherein, between each intersection point of pixel selection line and a pair of column data line and row electric current line pixel is set, and wherein, described pixel comprises at least two transistors and light emitting diode.
22. Active Matrix Display as claimed in claim 8, wherein, between each intersection point of pixel selection line and a pair of column data line and row electric current line, pixel is set, and wherein, described pixel comprises and is used for conducting/shutoffs transistor of selecting conducting or cut-off current being provided and being used to respond the transistor that described light emitting diode is arrived the Current Regulation of described row electric current line in described conducting/transistorized activation of shutoff by described column data line.
23. Active Matrix Display as claimed in claim 8, wherein, described at least one pixel comprises the 2-TFT image element circuit, wherein the first transistor comprise coupling with the source electrode that receives data-signal, coupling with the grid of receiver address signal and the drain electrode of being coupled to the grid of transistor seconds, and described transistor seconds comprises drain electrode and source electrode, is used for transmitting voltage to described the first transistor when described transistor seconds is activated.
24. Active Matrix Display as claimed in claim 8, wherein, described loopback control circuit comprises:
The current source sensing module, it comprises amplifier, the lead-out terminal that described amplifier has input terminal that is connected with constant voltage source and the input terminal that is connected with source transistor and switchably is connected to the grid of source transistor or sensing transistor, wherein, when switch conduction, described amplifier activates described source transistor so that the row electric current is sampled, perhaps when switch turn-offs, regulate voltage on the described sensing transistor in response to the differences among voltages of drawing in the current/voltage and the load on the described row electric current line of described source transistor; And
The data programing module, it comprises the amplifier that is connected between source transistor and the sensing transistor, and in response to regulating row line program voltage in source transistor voltage and the sensing transistor differences among voltages of being regulated; And
Described at least one pixel comprises the 2-TFT image element circuit, wherein, the first transistor comprise coupling with the source electrode that receives data-signal, coupling with the grid of receiver address signal and the drain electrode of being coupled to the grid of transistor seconds, and described transistor seconds comprises drain electrode and source electrode, is used for sending voltage to described the first transistor when described transistor seconds is activated.
25. a method that is used to drive Active Matrix Display comprises:
The voltage difference of sensing between the voltage of first source current of the voltage of the electric current that draws by programmed pixels and described Active Matrix Display; And
Regulate the data programing voltage of the pixel of described display according to described voltage difference;
Wherein, described sensing and adjusting are implemented by the loopback control circuit outside pixel column end that comprises described pixel and the pixel at described row.
26. method as claimed in claim 25 comprises repeatedly sensing and adjusting, up between the voltage of drive current and described first source current basically sensing less than voltage difference.
27. method as claimed in claim 25 comprises:
Described first source current is sampled;
Utilize the voltage of the program current identical with first source current of being sampled to come addressing first image element circuit, wherein, described first image element circuit comprises that striding across described image element circuit produces the transistor of exporting the voltage that changes in described program current;
The voltage that described output changes is compared with the voltage of first source current of being sampled in modular circuit, and described modular circuit is the part of described loopback control circuit; And
Regulate described programmed circuit voltage, the voltage with first source current of being sampled is identical basically up to the voltage of being regulated.
28. method as claimed in claim 25 comprises:
Described first source current is sampled; And
The voltage difference of repeat sensing between the voltage of first source current of the voltage of the electric current that draws by programmed pixels and described Active Matrix Display sequentially, and the data programing voltage of regulating the pixel of described display according to described voltage difference, the voltage with first source current of being sampled is identical basically up to the voltage of being regulated.
29. method as claimed in claim 25 comprises:
Electric current to the power supply of AMOLED circuit is sampled;
Come first pixel of the described AMOLED circuit of addressing according to the voltage of first program current, described voltage is identical with the voltage of the electric current of being sampled, wherein, described first image element circuit comprises the transistor that causes from the output voltage of the change of described first program current;
By the circuit module that is positioned at outside the described image element circuit voltage according to the electric current that output voltage drew of described change is compared with the voltage of the electric current of being sampled;
According between the current/voltage that is drawn and the current/voltage of being sampled, relatively regulating program current; And
It is identical with the current/voltage of being sampled basically up to the output voltage of described change with adjusting to repeat comparison.
30. method as claimed in claim 25 comprises the image element circuit of addresses pixel elements row and sequentially regulates the data programing voltage of each image element circuit of described row by identical loopback control circuit.
31. method as claimed in claim 25 comprises:
The voltage difference of sensing between the voltage of first source current of the voltage of the electric current that draws by programmed pixels and described Active Matrix Display; And
Regulate the data programing voltage of the pixel of described display according to described voltage difference; And
The voltage difference of sensing between the voltage of first source current of the voltage of the electric current that is drawn according to the data programing voltage of being regulated by programmed pixels and described Active Matrix Display; And
Regulate the data programing voltage of the pixel of described display according to described voltage difference.
32. an Active Matrix Display comprises:
A plurality of AMOLED pixels of in rectangular array and row, arranging, wherein, each pixel column is connected to shared electric current line and data shared voltage source and each pixel column and is connected to shared selection wire,
Wherein, at least one pixel comprises:
Current drive transistor, the source/drain that it has drain/source, grid and is connected to row electric current line;
Address transistor, the drain/source that it has the source/drain of the grid that is connected to described driving transistors and is connected to column data line;
Be connected to the selection wire of the grid of described address transistor; And
Be connected to the OLED of the drain/source of described current drive transistor;
Wherein, described a plurality of AMOLED pixel is connected at the end of at least one row and the loopback control circuit outside a plurality of pixels at described row, the voltage of the pixel current that described loopback control circuit sensing is driven and regulate the programme voltage of the pixel current regulated of column data line voltage, so as with the outside reference currents match.
33. a data driving circuit comprises:
At least one column data line;
At least one row electric current line in parallel;
Be connected in series to a plurality of pixels of described at least one column data line and corresponding row electric current line in parallel, comprise at least one pixel, it responds to described column data line so that pixel current is driven into described at least one pixel; And
At the end and the loopback control circuit outside a plurality of pixels of row of the row of data line and electric current line, its sensing is regulated the input data current in the voltage of the first input data current and the voltage difference between the voltage that the load on the electric current line is drawn and according to described voltage difference.
34. data driving circuit as claimed in claim 33, wherein, described loopback control circuit comprises:
Current source/sensing module, it is connected to power supply and at least one row electric current line, be used to store current level, the current level signal in the described row electric current of the sensing line and the power source voltage of being stored compared with described current level voltage of signals from described power supply; And
The data programing module, it is connected to described at least one column data line and can be connected to described current source/sensing module, is used for relatively regulating according to described current source/sensing module the voltage of column data.
35. a method that is used to drive Active Matrix Display comprises:
(A) initial current of the first routine data value of expression from the power supply to the Active Matrix Display is sampled;
(B) store the first identical programm voltage data value and use the described first programm voltage data value at second capacitor circuit to selected image element circuit;
(C) draw electric current according to next voltage data value, the result as pixel property changes deducts described next voltage data value from the applied first programm voltage data value;
(D) voltage of electric current that sensing draws and it is compared with the initial current voltage of signals of being sampled;
(E) according to the described new programm voltage data value that relatively the described first programm voltage data value is adjusted to the described second capacitor place;
(F) use described new programm voltage data value to selected pixel; And
(G) repeat the step that (B) arrives (F), up to identical with the voltage of the initial current of being sampled through institute's program stored voltage data value relatively.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/608,891 | 2006-12-11 | ||
| US11/608,891 US7512836B2 (en) | 2006-12-11 | 2006-12-11 | Fast backup of compute nodes in failing midplane by copying to nodes in backup midplane via link chips operating in pass through and normal modes in massively parallel computing system |
| PCT/US2007/025230 WO2008073371A1 (en) | 2006-12-11 | 2007-12-11 | Active matrix display and method |
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| CN102177487A true CN102177487A (en) | 2011-09-07 |
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