CN100483486C - Display device and used display panel, pixel circuit and compensating mechanism - Google Patents
Display device and used display panel, pixel circuit and compensating mechanism Download PDFInfo
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Abstract
It is display device with time sequence control circuit, programmable voltage generator, grating and source drive circuit and display panel. Wherein the redundant picture element unit and display picture element unit is formed with non-silicon thin film transistor and organic light diode. This invention can compare the working current of each display picture element unit and relative redundant picture element unit. Then the time sequence control circuit can compensate the current of the display unit after working a while according to the comparing results.
Description
Technical field
The present invention relates to a kind of image element circuit of display, particularly, relate to a kind of image element circuit that uses Organic Light Emitting Diode as the display of pixel components.
Background technology
Because multimedia society is progressive rapidly, the technology of semiconductor subassembly and display device also has tremendous progress thereupon.With regard to display, because thin film transistor (TFT)-active organic light-emitting diode (Thin Film Transistor-Active Matrix Organic Light EmittingDiode, hereinafter to be referred as the displaying appliance of TFT-AMOLED) have or not angle limitations, low manufacturing cost, high answer speed (being about more than hundred times of liquid crystal), power saving, the direct drive that can be used in portable machine, operating temperature range is big and in light weight and can be with computer hardware miniaturization and slimming or the like, so meet the characteristic requirement of multimedia era display.Therefore, positive type organic light emitting diode display has great development potentiality, is expected to become next novel flat-panel screens from generation to generation.
TFT-AMOLED display mainly contains two kinds of production methods at present, and a kind of is the technology of utilizing low temperature polycrystalline silicon TFT (LTPS TFT), and another kind is a technology of utilizing non-crystalline silicon tft (a-SiTFT), and the comparison of these two kinds of technology can be learnt from table 1.
| LTPS | a-Si TFT |
| Mobility | 50—200 | 0.5—1 |
| The kenel of TFT | PMOS and NMOS | NMOS |
| The TFT uniformity coefficient | Relatively poor | Better |
| The light shield number | 9—10 | 4—5 |
| Cost (only array of pixels) | High | Low |
| Cost (panel module) | Low (driving circuit is built-in) | High (driving circuit externally) |
| Equipment investment | High | Low |
| Benefit | Low | High |
| Whole cost | Comparatively cheap on the small size panel | Comparatively cheap on large size panel |
| The outputting current steadily degree | High | Low |
| The degree of degeneration of OLED | Insensitive | Responsive |
As can be seen from Table 1, because the uniformity coefficient of the TFT-AMOLED display of low temperature polycrystalline silicon TFT technology made is not good, and because in the process technique of low temperature polycrystalline silicon TFT, needs many light shield processing procedures and cause cost to rise.Therefore, low temperature polycrystalline silicon TFT technology is mainly used on the panel of small-medium size at present, the then non-crystalline silicon tft technology that are to use of large-sized panel more.
Can help the reduction of cost though utilize the non-crystalline silicon tft technology to make TFT-AMOLED display, non-crystalline silicon tft but exists the shortcoming on the numerous characteristics.Figure 1A has shown the drain current (Id) of non-crystalline silicon tft under different time and the performance plot of grid voltage (Vg).Shown in Figure 1A, non-crystalline silicon tft work is after after a while, and its drain current Id can produce drift phenomenon.
Figure 1B and 1C have shown the comparison diagram of the component characteristic of non-crystalline silicon tft and low temperature polycrystalline silicon TFT.Please earlier with reference to Figure 1B, its transverse axis is represented the time, and the longitudinal axis is then represented output current value.Shown in Figure 1B, low temperature polycrystalline silicon TFT can have good outputting current steadily degree, and amorphous silicon TFT is after work a period of time, and its output current can begin to descend.And in Fig. 1 C, transverse axis is represented the time, and the longitudinal axis is then represented brightness.Because low temperature polycrystalline silicon TFT outputting current steadily degree is very high, so the AMOLED display of application of cold temperature multi-crystal TFT still has very high brightness performance after work a period of time.Review non-crystalline silicon tft, because the degree of stability of its output current is not good, the AMOLED display that therefore utilizes non-crystalline silicon tft is after work a period of time, and brightness will go from bad to worse.Therefore, how non-crystalline silicon tft is compensated, and make and to utilize the AMOLED display of non-crystalline silicon tft to have more stable brightness, just become a very important problem.
Summary of the invention
One of purpose of the present invention is to provide a kind of image element circuit of display, can be with its working current output, so that itself is compensated.
The invention provides a kind of image element circuit of display, wherein display has multi-strip scanning line and data line, and image element circuit of the present invention comprises the first transistor, transistor seconds and pixel components.Wherein, the gate terminal of the first transistor couples wherein sweep trace, and its drain electrode end couples wherein data line, and its source terminal couples the gate terminal of transistor seconds.In addition, the drain electrode end of transistor seconds couples a voltage source, and its source terminal couples pixel components.What deserves to be mentioned is that image element circuit of the present invention also comprises current mirror (Current Mirror) module and switch module.Current mirror module has a current input terminal and a current output terminal, and wherein current input terminal is coupled to the source terminal of transistor seconds by pixel components, is used for and will flows through the current replication of pixel components to current output terminal.And switch module selects signal to determine whether the electric current output that current output terminal is exported according to one, after comparing with a reference current, itself is carried out a compensating movement.
In an embodiment of the present invention, current mirror module comprises the 3rd transistor and the 4th transistor.Wherein, the 3rd transistor drain end couples current input terminal, and the 3rd transistorized source terminal ground connection.In addition, the 4th transistor drain end couples the current output terminal of current mirror module, and its source terminal equally also is a ground connection, and its gate terminal couples the 3rd transistorized gate terminal and drain electrode end.
In addition, switch module is a switching transistor, and its gate terminal receives selects signal, and its drain electrode end couples the 4th transistor drain end (current output terminal), so that switching transistor can determine whether its source terminal and drain electrode end conducting according to selecting signal.
In general, the source terminal of the first transistor also can be passed through a capacitor grounding.
And under preferable situation, above-mentioned pixel components includes OLED.Wherein, the anode tap of Organic Light Emitting Diode couples the source terminal of transistor seconds, and the cathode terminal of Organic Light Emitting Diode is coupled to the current input terminal (the 3rd transistor drain end) of current mirror.In addition, in an embodiment of the present invention, the first transistor and transistor seconds are amorphous silicon film transistor (a-Si TFT).
State with other purpose, feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Figure 1A has shown the drain current of non-crystalline silicon tft under different time and the performance plot of grid voltage:
Figure 1B and 1C have shown the comparison diagram of the component characteristic of non-crystalline silicon tft and low temperature polycrystalline silicon TFT;
Fig. 2 A has shown the calcspar according to the internal circuit of a kind of display equipment of a preferred embodiment of the present invention:
Fig. 2 B has shown the calcspar according to the internal circuit of a kind of display equipment of another embodiment of the present invention;
Fig. 3 has shown according to a kind of display pixel cells of one of the present invention preferred embodiment and the internal circuit diagram of redundant sub-pixels unit;
Fig. 4 has shown the calcspar according to the internal circuit of a kind of current detection circuit of one of the present invention preferred embodiment;
Fig. 5 has shown the calcspar according to the internal circuit of a kind of sequential control circuit of one of the present invention preferred embodiment; And
Fig. 6 has shown the flow chart of steps according to the compensation method of a kind of display equipment of one of the present invention preferred embodiment;
(primary clustering symbol description)
31,41: switching transistor 10: display panel
312: display pixel cells 314: the redundant sub-pixels unit.
321: gate driver circuit 323: source electrode drive circuit
330: sequential control circuit 332: the driving circuit control module
334: image quality compensating unit 336: the interface processing unit
351: able to programmeization voltage generator
401,403,422,424,431,433: transistor
405,435: pixel components 407,437: switch module
420: current mirror module 500,600: current detection circuit
502: subtracter 504: current-to-voltage convertor
506: analog-digital converter A1: surveyed area
D1～Dn: data line G0, Gm: redundant sweep trace
G1～Gm-1: sweep trace I1, I0, Id0, Id0 electric current
Idiff: difference electric current I N: current input terminal
OUT: current output terminal Sel_1: select signal.
T1～Tm-1: on-off circuit Vdd: power supply
S701,, the steps flow chart of the compensation method of S703, S705, S707 display equipment.
Embodiment
Fig. 2 A has shown the calcspar according to the internal circuit of a kind of display equipment of one of the present invention preferred embodiment.Please refer to Fig. 2 A, in display equipment provided by the present invention, have display panel 310, it is coupled to gate driver circuit 321 and source electrode drive circuit 323 respectively by means of sweep trace G1～Gm-1 and data line D1～Dn.In addition, in the present invention, also comprise sequential control circuit 330, be used for controlling gate driver circuit 321.With source electrode drive circuit 323, to drive display panel 310 output images.In addition, in an embodiment of the present invention, more dispose redundant sweep trace.Because the restriction on the processing procedure, the present invention is configured in the outermost of sweep trace G1～Gm-1 with redundant sweep trace, and just Fig. 2 A illustrates, and is indicating two solid lines of G0 and Gm.What deserves to be mentioned is also have programmable voltage generator 351 in the present invention, produce a plurality of data voltages according to the control of sequential control circuit 330, and deliver in the display panel 310 by source electrode drive circuit 323.Wherein, above-mentioned m and n are all positive integer.
In display panel 310, sweep trace G1～Gm-1 and redundant sweep trace G0 and Gm are arranged in parallel with each other with first direction, and data line D1～Dn then is parallel to each other with second direction, and are staggered with sweep trace G1～Gm-1 and redundant sweep trace G0 and Gm.In general, first direction is substantially vertical with second direction.In the present invention, the confluce of data line D1～Dn and sweep trace G1～Gm-1 dispose display pixel cells 312, and the confluce of data line DI～Dn and redundant sweep trace G0 and Gm disposes redundant sub-pixels unit 314.
In addition, in the present embodiment, sweep trace G1 is coupled to redundant sweep trace G0 by on-off circuit T1.And sweep trace Gm-1 is coupled to redundant sweep trace Gm by on-off circuit T2.And the conducting of on-off circuit T1 or T2 whether, by sequential control circuit 330 controls.
Fig. 2 B has shown the calcspar according to the internal circuit of a kind of display equipment of another embodiment of the present invention.Please refer to Fig. 2 B, select among the embodiment at another, each sweep trace G1～Gm-1 is coupled to redundant sweep trace G0 and Gm by one among on-off circuit T1～Tm-1 respectively.Wherein, we can claim that the on-off circuit (as on-off circuit T1) of close redundant sweep trace G0 is first switches set, and all the other are the second switch group near the on-off circuit of redundant sweep trace Gm-1, and under preferable situation, the total number of switches that first and second switches set are had is identical.
In the present embodiment, the sweep trace of half is connected to redundant sweep trace G0 by the switch of correspondence, and the switch of remaining sweep trace by correspondence is connected to redundant sweep trace Gm.And each on-off circuit T1～Tm-1 is whether to decide its conducting by sequential control circuit 330, and when display panel 310 entered a compensation model, sequential control circuit 330 will gauge tap circuit T1～Tm-1 takes turns conducting.In the present embodiment, on-off circuit T1～Tm-1 can be realized by switching transistor 31 respectively.Wherein, first source of switching transistor 31/drain electrode end system is coupled on the corresponding scanning line, second source/drain electrode end is coupled on the redundant sweep trace (in the present embodiment, being G0 and Gm the two one of them), and the gate terminal of switching transistor 31 then is coupled to sequential control circuit 330.
In the present invention, display pixel cells 312 is general pixel cells, and sequential control circuit 330 drives these display pixel cells 312, so that display panel 310 can output image by means of control gate driver circuit and source electrode drive circuit.Relatively, redundant sub-pixels unit 314 can't be activated when display panel 310 is in normal running.Directly wait until when display panel 310 begins to enter compensation model, sequential control circuit 330 can produce test signal and come one of them on-off circuit of activation, to dispose the sweep signal that sweep trace was received of display pixel cells 312 by means of one of them, activate redundant sub-pixels unit 314.
Select among the embodiment at another, each on-off circuit T1～Tm-1 can also be coupled on the sweep trace that disposes redundant sub-pixels unit 314 by multiplexer.
In addition, in the present invention, each display pixel cells 312 can also couple a current detection circuit (illustrating as Fig. 4).When sequential control circuit 330 drove one of them on-off circuit, the display pixel cells 312 on the sweep trace that it coupled will the extremely corresponding current detection circuit of output services electric current.And the working current that current detection circuit just can be sent the display pixel cells 312 of correspondence compares with the working current of the redundant sub-pixels unit 314 that is coupled on same the data line.And sequential control circuit 330 will be controlled programmable voltage generator 351 according to comparative result, adjust the level of the data voltage that each display pixel cells 314 received, so that the working current of each display pixel cells 314 keeps necessarily, and then make the brightness of the image that display panel 310 is exported to keep necessarily.
Same because of the restriction on the processing procedure, so the present invention can allow a plurality of display pixel cells 312 to share current detection circuits.With Fig. 2 B is example, and the display pixel cells 312 of only about half of number can be shared a current detection circuit on same data line.Relatively, in the present embodiment, each redundant sub-pixels unit 314 can be used to detect the display pixel cells 312 of half number on same the data line.
Fig. 3 has shown according to a kind of display pixel cells 312 of one of the present invention preferred embodiment and the internal circuit diagram of redundant sub-pixels unit 314.Please refer to Fig. 3, because the structure of each display pixel cells 312 and redundant sub-pixels unit 314 is all identical substantially, therefore below only with therefore only with the redundant sub-pixels unit 314 of data line D1 among Fig. 3 and redundant sweep trace G0 confluce, and with the display pixel cells 312 of sweep trace G1 confluce be the example introduction.
In the display pixel cells 312 of data line D1 and sweep trace G1 confluce, transistor 401 and 403 have been comprised.Wherein, the gate terminal of transistor 401 couples corresponding scanning line (G1), and its drain electrode end then couples corresponding data line (D1).And the source terminal of transistor 401 couples the gate terminal of transistor 403, and passes through capacitor 43 ground connection.In addition, the drain electrode end of transistor 403 couples power supply Vdd, and its source terminal then is coupled on the current input terminal IN of current mirror module 420 by pixel components 405.Because current mirror module 420 is coupled to the source terminal of transistor 403 by pixel components 405, so current mirror module 420 can will copy to by the electric current I d1 of pixel components 405 on its current output terminal OUT.And on the current output terminal OUT of current mirror module 420, more coupled switch module 407.This switch module 407 determines whether conducting according to the selection signal Sel_1 that is for example produced by the sequential control circuit 330 shown in Fig. 2 A or the 2B.In the present embodiment, pixel components 405 includes OLED.
In the present embodiment, transistor 401 and 403 is amorphous silicon film transistor (a-Si/FT).
In addition, current mirror module 420 mainly is made up of transistor 422 and 424.Wherein, the drain electrode end of transistor 422 is coupled to current input terminal IN.In other words, the drain electrode end of transistor 422 is exactly the current input terminal IN of current mirror module 420.The source terminal of transistor 4202 then is a ground connection.In addition, the gate terminal of transistor 424 is coupled to the drain electrode end and the gate terminal of transistor 422, and the drain electrode end of transistor 424 and source terminal, is coupled to the current output terminal OUT and the ground connection of current mirror module 420 respectively.
In addition, under preferable situation, switch module 407 also can utilize switching transistor 41 to realize.In detail, the gate terminal system of switching transistor 41 receives selects signal Sel_1, and its drain electrode end couples the current output terminal OUT of current mirror module 420, so that switching transistor 41 can determine whether its source terminal of conducting and drain electrode end according to selecting signal Sel_1.
In the present invention, the circuit structure of redundant sub-pixels unit 314 and employed component characteristic, identical with display pixel cells 312 substantially, thereby just seldom be described herein at this.
Suppose, when the present invention need detect and the display pixel cells 312 of data line D1 and sweep trace G1 confluce compensated, then at first for example the sequential control circuit shown in Fig. 2 A or the 2B 330 needs driving switch circuit T1, send sweep signal by gate driver circuit 321 then and activate redundant sub-pixels unit 314 on the redundant sweep trace G0, and activate the display pixel cells 312 on the sweep trace G1 simultaneously.Sequential control circuit 330 can produce again and select signal Sel_1 to come the switch module of activation simultaneously 407 and 437 then, to detect the working current that flows through pixel components 405 and 435 simultaneously.
In the present invention, to the key that display pixel cells 312 compensates, be exactly the electric current that pixel components flow through of each display pixel cells 312 inside.With pixel components 405 is example, flows through the electric current of pixel components 405, is exactly the drain current Id1 of transistor 403.Well known, the drain current worker d1 of transistor 403 can calculate with following formula:
Id1＝1/2μC
ox(W/L)(V
gs—V
th)
2
Wherein, μ represents carrier transport factor, C
OxRepresent the exhaustion region capacitance of transistor 403, W/L represents the ratio of the channel width and the length of transistor 403, V
GsAnd V
ThBe respectively the gate-source voltage value and the critical voltage value of transistor 403.
Amorphous silicon film transistor 403 is after work a period of time, and the main key that can cause drain current Id1 to descend is to be critical voltage V
ThThat is to say, amorphous silicon film transistor 403 work a period of time after, critical voltage V
ThCan begin to rise, thereby cause the decline of drain current Id1.Therefore, the present invention can be according to the critical voltage V of transistor 403
ThThe amplitude that rises will be delivered to the voltage level of the data voltage of transistor 401 synchronously and heighten, and just can and then heighten the gate-source voltage Vss of transistor 403, so that the drain current Id1 of transistor 403 is maintained fixed.And how to gate-source voltage V
GsAdjust, have a detailed explanation following.
In addition, in the present embodiment, the present invention can compensate the display pixel cells on two sweep traces simultaneously.That is to say, can utilize the redundant sub-pixels unit 314 that is coupled on redundant sweep trace G0 and the Gm simultaneously, the action that the display pixel cells 312 on the sweep trace that comes it is coupled compensates.
Fig. 4 has shown the calcspar according to the internal circuit of a kind of current detection circuit of one of the present invention preferred embodiment.Please refer to Fig. 4, below in order to make those skilled in the art can understand main spirit of the present invention, therefore only with the redundant sub-pixels unit 314 of data line D1 among Fig. 3 and redundant sweep trace G0 confluce, and with the display pixel cells 312 of sweep trace G1 confluce be the example introduction.The on-off circuit 407 of Fig. 3 and 437 electric current I of being exported 1 and I0 can be sent to current detection circuit 500.In current detection circuit 500, subtracter 502 is that electric current I 0 is deducted electric current I 1, and obtains difference electric current I diff.And since electric current I 0 and I1 because replication stream is crossed the electric current I dO and the Id1 of pixel components 435 and 405 and is obtained, so its size of current can be approximately identical.
Suppose that pixel components 405 and 435 is an Organic Light Emitting Diode, and transistor 401,403,431 and 433 is all amorphous silicon film transistor.Therefore, after pixel components 405 was worked a period of times, as mentioned above, the critical voltage of amorphous silicon film transistor 403 can rise, and therefore drove the electric current I d1 of pixel components 405, and just the drain current of transistor 403 can begin drift and diminish.At this moment, for example the sequential control circuit shown in Fig. 2 A or the 2B 330 begins to activate redundant sub-pixels 314, because transistor 433 just comes into operation, and transistor 433 and 403 is with a kind of transistor component, that is to say that transistor 433 is all identical substantially with 403 various component characteristics.Therefore, as long as with the drain current Id0 of transistor 433, deduct the drain current Id1 of transistor 403, just can know that transistor 403 is after work a period of time, the side-play amount of its drain current Id1, this present invention just utilizes subtracter 502 electric current I 0 to be deducted the purpose of electric current I 1.
After subtracter 502 deducts electric current I 1 with electric current I 0, can obtain difference electric current I diff, it has represented transistor 403 after work a period of time, the side-play amount of drain current Id1.Then, current-to-voltage convertor 504 can convert difference electric current I diff the kenel of voltage to, and delivers to analog-digital converter 506.And the output that analog-digital converter 506 is understood according to current-to-voltage convertor 504, and send a compensating signal to sequential control circuit 330.
Fig. 5 has shown the calcspar according to the internal circuit of a kind of sequential control electricity Lopa Nationality 330 of one of the present invention preferred embodiment.Please refer to Fig. 5, in sequential control circuit 330, driving circuit control module 332 is controlled the display panel 310 shown in gate driver circuit 321 and source electrode drive circuit 323 driving Fig. 2 A or the 2B, so that its output image according to a video data and a synchronous signal.And image quality compensating unit 334 couples driving circuit control module 332, and detects the operative scenario of each display pixel cells 312 by a plurality of current detection circuits 600.Wherein, the inside structure of each testing circuit 600 can be identical with the current detection circuit 500 of Fig. 4.Therefore, image quality compensating unit 334 can be controlled source electrode drive circuit 323 according to the operative scenario of each display pixel cells 312, and control the suitable data voltage of programmable voltage generator 351 outputs to source electrode drive circuit 323 by interface processing unit 336, so that the brightness of display panel 310 output pictures can be kept necessarily.
Fig. 6 has shown the flow chart of steps according to the compensation method of a kind of display equipment of one of the present invention preferred embodiment.Please refer to Fig. 6, the applied display equipment of the present invention can be with reference to display equipment shown in Fig. 2 A and the 2B.Owing in the display equipment shown in Fig. 2 A and the 2B, only on redundant sweep trace G0 and redundant sweep trace Gm, dispose redundant sub-pixels unit 314.Therefore, when the action that need detect and compensate display pixel cells 312, certainly will carry out in batches.According to above-mentioned reason, we need be distinguished into several surveyed areas (as the regional A1 that dotted line crossed among Fig. 2 A and the 2B) with it and detect in batches and compensate according to the position at each display pixel cells place.
In the time will detecting and compensate the display pixel cells 312 of Fig. 2 A and 2B, at first sequential control circuit 330 can make one of them surveyed area enter compensation model as described in the step S701.In the present embodiment, the step that sequential control circuit 330 makes a surveyed area enter compensation model, the data voltage of the complete white data of input representative earlier to the surveyed area all display pixel cells 312 and detect pixel cell 314.Produce then and select signal (Sel_1 as shown in Figure 3) to display pixel cells 312 and detection pixel cell 314, with its switch inside assembly (as shown in Figure 3) of activation.
After a surveyed area enters compensation model, will be as described in the step S703, each display pixel cells 312 in this surveyed area and detect pixel cell 314 will be with the working current of the pixel components (for example pixel components 405 and 435 of Fig. 3) of its inside, deliver in the current detector 500 that illustrates as Fig. 4 and compare.Then as described in the step S705, current detector 500 can produce a comparative result, and delivers to pixel compensation unit 334 for example shown in Figure 5.At this moment, pixel compensation unit 334 will carry out step S707, controls programmable voltage generator 351 according to comparison result by interface processing unit 336, proofreaies and correct the level of its data voltage that display pixel cells in surveyed area 312 is exported.The rest may be inferred, and sequential control circuit 330 detects the display pixel cells in all surveyed areas in turn, and compensates according to the situation of its running according to the step of Fig. 6.
In sum, the present invention has the following advantages at least:
1, image element circuit provided by the present invention, because utilized current mirror module and switch module, therefore the electric current that can capture by its inner pixel components compares, and carries out suitable compensation with the transistor to its inside.
2,, have redundant sub-pixels unit and display pixel cells, and the redundant sub-pixels unit can't be activated when display panel operate as normal of the present invention because display panel provided by the present invention.Therefore, the present invention is used as the working current of redundant sub-pixels unit as reference current, calculating display pixel cells side-play amount of its working current after work a period of time, and comes it is compensated according to this side-play amount.
3, display equipment provided by the present invention, owing to have the programmable voltage generator, therefore when the interior image quality compensating unit of sequential control circuit, learn the side-play amount of working current of each display pixel cells by current detection circuit after, just can control programmable voltage generator output suitable data voltage, with the compensation working current that display pixel cells was offset.
4, in the compensation method of display equipment provided by the present invention, because working current in the pixel cell and reference current are compared, and proofread and correct the data voltage that each pixel cell receives according to comparative result.Therefore the working current of each pixel cell is kept necessarily.
Though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and correction, so protection scope of the present invention should be considered as being as the criterion with the accompanying Claim person of defining.
Claims (8)
1, a kind of image element circuit of display, wherein this display has a plurality of sweep traces and a plurality of data line, this image element circuit includes a first transistor, its drain electrode end couple described a plurality of data line one of them, its gate terminal then couple described a plurality of sweep trace one of them; With a transistor seconds, its gate terminal couples the source terminal of this first transistor, and the drain electrode end of this transistor seconds couples a voltage source; It is characterized in that, also include:
One pixel components couples the source terminal of this transistor seconds;
One current mirror module has a current input terminal and a current output terminal, and wherein this current input terminal is coupled to the source terminal of transistor seconds by this pixel components, with the current replication that will flow through this pixel components to this current output terminal; And
One switch module is in order to the electric current output that determines whether according to a selection signal this current output terminal is exported, to compare with a reference current.
2, the image element circuit of display as claimed in claim 1, wherein, this current mirror module comprises:
One the 3rd transistor, its drain electrode end couples this current input terminal, and the 3rd transistorized source terminal ground connection; And
One the 4th transistor, its drain electrode end couples this current output terminal, its source terminal ground connection, its gate terminal then couples the 3rd transistorized gate terminal and drain electrode end.
3, the image element circuit of display as claimed in claim 2, wherein, this switch module comprises a switching transistor, its gate terminal receives this selection signal, with and drain electrode end couple the 4th transistor drain end, so that this switching transistor is selected signal according to this, determine whether its source terminal and drain electrode end conducting.
4, the image element circuit of display as claimed in claim 1, wherein, this switch module comprises a switching transistor, its gate terminal receives this selection signal, and its drain electrode end couples this current output terminal, so that this switching transistor is selected signal according to this, determine whether its source terminal and drain electrode end conducting.
5, the image element circuit of display as claimed in claim 1, wherein, the source terminal of this first transistor is also by a capacitor grounding.
6, the image element circuit of display as claimed in claim 1, wherein, this pixel components comprises an Organic Light Emitting Diode.
7, the image element circuit of display as claimed in claim 6, wherein, this first and second transistor comprises amorphous silicon film transistor.
8, the image element circuit of display as claimed in claim 6, wherein, the anode tap of this Organic Light Emitting Diode couples the source terminal of this transistor seconds, and the cathode terminal of this Organic Light Emitting Diode is coupled to this current input terminal.
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| CN111261089B (en) * | 2020-03-04 | 2021-07-27 | 苏州华星光电技术有限公司 | Display device and electronic apparatus |
| US12126922B2 (en) | 2021-05-11 | 2024-10-22 | Boe Technology Group Co., Ltd. | Virtual image display system, data processing method thereof and display apparatus |
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