CN202120574U - AMOLED compensating circuit pixel structure and AMOLED display panel - Google Patents
AMOLED compensating circuit pixel structure and AMOLED display panel Download PDFInfo
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- CN202120574U CN202120574U CN2011202516149U CN201120251614U CN202120574U CN 202120574 U CN202120574 U CN 202120574U CN 2011202516149 U CN2011202516149 U CN 2011202516149U CN 201120251614 U CN201120251614 U CN 201120251614U CN 202120574 U CN202120574 U CN 202120574U
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Abstract
The utility model discloses an AMOLED compensating circuit pixel structure and an AMOLED display panel, which relate to the field of OLED display technology. The AMOLED compensating circuit pixel structure includes a gate line, a data line, a power line, a grounding electrode, a switch transistor, a compensation sub circuit, a driving transistor, a storage capacitor and an organic light-emitting diode OLED. The switch transistor gate is connected with the gate line, the original electrode is connected with the data line, and the drain electrode is connected with the first terminal of the compensation sub circuit; the second terminal of the compensation sub circuit is connected with the gate line, and the third terminal is connected with the first terminal of the storage capacitor to store the threshold voltage of the driving transistor in the storage capacitor in advance; the driving transistor gate is connected with the first terminal of the storage capacitor, the drain electrode is connected with the power line, and the original is connected with the OLED for supplying a driving current for the OLED; and the anode of the OLED is connected with the original of the driving transistor, and the cathode is connected with the grounding electrode. In the utility model, the structure is simple, not only is the threshold voltage drift compensation function is possessed, but also the reset of the driving transistor gate signal is realized, and the signal influence between one frame and another is reduced.
Description
Technical field
The utility model relates to OLED display technique field, particularly a kind of AMOLED compensating circuit dot structure and AMOLED display panel.
Background technology
At present at active matrix organic light-emitting display panel (Active Matrix/Organic Light Emitting Diode; AMOLED) in the demonstration field; Especially in the large-size substrate design, because backboard TFT (Thin Film Transistor, TFT) the inequality property in technological process; And stability problem, cause the unevenness of OLED electric current.Because the TFT unevenness that causes in the backboard production run, institute causes threshold voltage shift (Vth Shift) in order to remedy, and the defective of opening the TFT stability decreases that bias voltage causes for a long time, need compensate circuit design.Existing compensating circuit complex structure, clock signal is more.As shown in Figure 1, this structure is the 6T2C structure with threshold voltage compensation function, and this structure comprises: 6 transistor T FT, two MM CAPs, and 6 signal wires constitute.Its circuit structure is complicated, and the clock signal that is used to control is handed over many, and sequential control is complicated.
The utility model content
The technical matters that (one) will solve
The technical matters that the utility model will solve is: the compensating circuit how implementation structure is simple, clock signal is less.
(2) technical scheme
For solving the problems of the technologies described above; The utility model provides a kind of AMOLED compensating circuit dot structure; Comprise: grid line, data line, power lead, earthing pole, switching transistor, compensation electronic circuit, driving transistors, MM CAP and Organic Light Emitting Diode OLED
Said switching transistor grid connects said grid line, and source electrode connects said data line, and drain electrode connects first end of said compensation electronic circuit;
Second end of said compensation electronic circuit connects said grid line, and the 3rd end connects first end of said MM CAP, is used for storing in advance to said MM CAP the threshold voltage of said driving transistors;
Said drive transistor gate connects first end of said MM CAP, and source electrode connects second end of said power lead and said MM CAP, and drain electrode connects said OLED, is used to OLED drive current is provided;
The anode of said OLED connects the drain electrode of said driving transistors, and negative electrode connects said earthing pole.
Wherein, said compensation electronic circuit comprises: first compensation transistor and second compensation transistor,
The source electrode of said first compensation transistor is first end of said compensation electronic circuit, connects the drain electrode of said switching transistor, and drain electrode connects the grid of said driving transistors and first end of said MM CAP, and grid connects the drain electrode of said second compensation transistor;
The grid of said second compensation transistor is second end of said compensation electronic circuit, connects said grid line, and source electrode connects the grid of said driving transistors and first end of said MM CAP;
The source electrode of the drain electrode of said first compensation transistor and second compensation transistor is the 3rd end of said compensation electronic circuit.
Wherein, said switching transistor, driving transistors and second compensation transistor are P type TFT.
Wherein, said first compensation transistor is P type TFT or N type TFT.
Wherein, also comprise: reference power source and reset transistor,
The grid of said reset transistor connects said reference power source, and source electrode connects said earthing pole, and drain electrode connects the grid of said driving transistors, the signal of the said driving transistors that is used to reset.
Wherein, said reset transistor is P type TFT or is N type TFT.
The utility model also provides a kind of AMOLED display panel, and the AMOLED compensating circuit dot structure in the said panel is above-mentioned each described AMOLED compensating circuit dot structure.
(3) beneficial effect
The structure of the utility model through switching transistor, compensation electronic circuit, driving transistors, MM CAP realized simple in structure, the compensating circuit that clock signal is less; And connect the reset signal of driving transistors of reference power source through reset transistor, and make the previous frame signal minimize to the influence of next frame signal, greatly reduced the influence of signal between frame and the frame
Description of drawings
Fig. 1 is a kind of AMOLED compensating circuit dot structure synoptic diagram of the prior art;
Fig. 2 is a kind of AMOLED compensating circuit dot structure synoptic diagram of the utility model embodiment;
Fig. 3 is the clock signal figure when AMOLED compensating circuit dot structure is worked among Fig. 2;
Fig. 4 is the another kind of AMOLED compensating circuit dot structure synoptic diagram of the utility model embodiment;
Fig. 5 is the clock signal figure when AMOLED compensating circuit dot structure is worked among Fig. 4;
Fig. 6 is the every frame of driving transistors of AMOLED compensating circuit dot structure among Fig. 4 simulate effect figure that resets.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the embodiment of the utility model is described in further detail.Following examples are used to explain the utility model, but are not used for limiting the scope of the utility model.
As shown in Figure 2, the AMOLED compensating circuit dot structure of the utility model comprises: grid line 201, data line 202, power lead 203, earthing pole 204, switching transistor 205, compensation electronic circuit, driving transistors 208, MM CAP 209 and Organic Light Emitting Diode OLED 210.
Wherein, the grid of switching transistor 205 connects grid line 201, and source electrode connects data line 202, and drain electrode connects first end of compensation electronic circuit.Second end of compensation electronic circuit connects first end that grid line 201, the three ends connect MM CAP 209, is used for to MM CAP 209 threshold voltage of storing driver transistor 208 in advance.Second end of MM CAP 209 connects the source electrode of driving transistors 208, and when grid line 201 was low-voltage, MM CAP 209 provided grid voltage for driving transistors 208.
In the present embodiment, the compensation electronic circuit specifically comprises: first compensation transistor 206 and second compensation transistor 207.The source electrode of first compensation transistor 206 is first end of compensation electronic circuit, connects the drain electrode of switching transistor 205, and drain electrode connects the grid of driving transistors 208 and first end of MM CAP 209, and grid connects the drain electrode of second compensation transistor 207.
The grid of second compensation transistor 207 is second end of compensation electronic circuit, connects grid line 201, and source electrode connects the grid of driving transistors 208 and first end of MM CAP 209.
Common the 3rd end of electronic circuit by way of compensation of the source electrode of the drain electrode of first compensation transistor 206 and second compensation transistor 207.
The grid of driving transistors 208 connects first end of MM CAP 209, and source electrode connects second end of power lead 203 and MM CAP 209, and drain electrode connects OLED 210, is used to OLED drive current is provided.The anode of OLED 210 connects the source electrode of driving transistors 208, and negative electrode connects earthing pole 204.
In the present embodiment, above-mentioned switching transistor 205, driving transistors 208 and second compensation transistor 207 are P type TFT, and first compensation transistor 206 can be P type TFT or N type TFT.
The principle of work of the AMOLED compensating circuit dot structure of present embodiment is following:
Clock signal figure when Fig. 3 is the work of above-mentioned AMOLED compensating circuit dot structure; The start signal of grid line 201 is a low voltage signal; When the grid of the grid of this low voltage signal input switch transistor 205 and second compensation transistor 207, the source-drain electrode conducting of the source-drain electrode of switching transistor 205 and second compensation transistor 207.At this moment, the signal of data line 202 is high voltage signal Vdata.
Switching transistor 205 conducting under the low voltage signal of grid line 201 is input to the A point with the voltage signal Vdata of data line 202.Second compensation transistor 207 conducting under the start signal of grid line 201; Make first compensation transistor 206 constitute a diode syndeton; This structure becomes Vdata-Vth ' after making Vdata through first compensation transistor 206, and Vth ' is the threshold voltage of first compensation transistor 206.Therefore, the signal of driving transistors 208 just becomes Vdata-Vth ', and this signal makes driving transistors 208 be operated in the saturation region, and the electric current through driving transistors 208 outputs is like this: I=1/2 * K * (Vgs-Vth)
2=1/2 * K * (VDD-Vdata+Vth '-Vth)
2=1/2 * K * (VDD-Vdata)
2, K=W/L * C * u wherein, wherein W is the width of transistor channel, and L is the length of transistor channel, and C is the electric capacity between transistor channel and grid, and u is the carrier mobility of transistor channel.Vgs is the grid source pressure reduction of driving transistors 208, and Vth is the threshold voltage of driving transistors 208.K is relatively stable in the same structure, can be regarded as constant, and adjacent two transistorized threshold voltage difference in size are very little, can think identical, i.e. Vth '=Vth.Therefore, the electric current of the OLED 210 that flows through just only with VDD and Vdata signal correction, and irrelevant with Vth, thus the electric current of the OLED that flows through is different because of the inhomogeneous electric current that causes of Vth that the backboard reasons causes, and causes the brightness variation.The electric current that can also improve the OLED that flows through that causes owing to the Vth decline simultaneously changes, and causes that brightness changes, and makes the situation of AMOLED bad stability.Can find out that from Fig. 1 and Fig. 2 circuit structure is simple in the present embodiment, clock signal is few, only needs the signal of grid line 201 and data line 202.
Embodiment 2
Of Fig. 4, the structure with embodiment 1 of present embodiment is basic identical, and different is on embodiment 1 structure, to have increased reference power source 411 and reset transistor 412.The grid of reset transistor 412 connects reference power source 411, and source electrode connects earthing pole 404, and drain electrode connects the grid of driving transistors 408, is used for the signal of reset drives transistor 408.Structurally, the connected mode of grid line 201～OLED210 of the connected mode of grid line 401～OLED 410 and embodiment 1 is identical.
In the present embodiment, switching transistor 405, driving transistors 408, second compensation transistor 407 and reset transistor 412 are P type TFT.
The principle of work of the AMOLED compensating circuit dot structure of present embodiment is following:
As shown in Figure 5, the clock signal figure during for the work of the AMOLED compensating circuit dot structure of present embodiment has increased the sequential of reference power source signal REF on the basis of embodiment 1.As can be seen from the figure, before the pulse of each voltage signal of each start signal of grid line 401 and data line 402 arrived, reference power source 411 output LOW voltage signals were given reset transistor 412; Make the drain-source utmost point conducting of reset transistor 412; The GND signal of earthing pole 404 is input to the grid of driving transistors 408, the signal of driving transistors 408 is made zero, the REF signal becomes high voltage signal afterwards; The drain-source utmost point of reset transistor 412 is broken off; Simultaneously the signal of grid line 401 and data line 402 all becomes high voltage signal, and principle of work afterwards is just identical with the principle of embodiment 1, here Ao Shu no longer.The signal that promptly before every frame signal of grid line 401 and data line 402 arrives, all shows driving transistors 408 makes zero.
As shown in Figure 6; The simulate effect figure that resets for the every frame of 408 grids of driving transistors in the present embodiment can find out from this simulate effect figure, before driving transistors 408 every frames are opened; The grid voltage of driving transistors 408 all will make zero earlier; Be that grid resets (shown in the solid line), guarantee that the residual voltage signal (shown in the dotted line) of previous frame makes zero, and does not influence the voltage signal of next frame.Can find out that from simulate effect figure the effect that makes zero of resetting before every frame is fine, the next frame signal does not receive the previous frame effect of signals.
Switching transistor, first compensation transistor, second compensation transistor and reset transistor among embodiment 1 and the embodiment 2 mainly play on-off action, and the connection of its source-drain electrode can be exchanged.
Embodiment 3
In the present embodiment, a kind of AMOLED display panel is provided, the AMOLED compensating circuit dot structure in the display panel is the foregoing description 1 or embodiment 2 described AMOLED compensating circuit dot structures.
Above embodiment only is used to explain the utility model; And be not the restriction to the utility model; The those of ordinary skill in relevant technologies field under the situation of spirit that does not break away from the utility model and scope, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to the category of the utility model, and the scope of patent protection of the utility model should be defined by the claims.
Claims (7)
1. AMOLED compensating circuit dot structure comprises: grid line, data line, power lead, earthing pole, switching transistor, compensation electronic circuit, driving transistors, MM CAP and Organic Light Emitting Diode OLED, it is characterized in that,
Said switching transistor grid connects said grid line, and source electrode connects said data line, and drain electrode connects first end of said compensation electronic circuit;
Second end of said compensation electronic circuit connects said grid line, and the 3rd end connects first end of said MM CAP, is used for storing in advance to said MM CAP the threshold voltage of said driving transistors;
Said drive transistor gate connects first end of said MM CAP, and source electrode connects second end of said power lead and said MM CAP, and drain electrode connects said OLED, is used to OLED drive current is provided;
The anode of said OLED connects the drain electrode of said driving transistors, and negative electrode connects said earthing pole.
2. AMOLED compensating circuit dot structure as claimed in claim 1 is characterized in that, said compensation electronic circuit comprises: first compensation transistor and second compensation transistor,
The source electrode of said first compensation transistor is first end of said compensation electronic circuit, connects the drain electrode of said switching transistor, and drain electrode connects the grid of said driving transistors and first end of said MM CAP, and grid connects the drain electrode of said second compensation transistor;
The grid of said second compensation transistor is second end of said compensation electronic circuit, connects said grid line, and source electrode connects the grid of said driving transistors and first end of said MM CAP;
The source electrode of the drain electrode of said first compensation transistor and second compensation transistor is the 3rd end of said compensation electronic circuit.
3. AMOLED compensating circuit dot structure as claimed in claim 2 is characterized in that said switching transistor, driving transistors and second compensation transistor are P type TFT.
4. AMOLED compensating circuit dot structure as claimed in claim 2 is characterized in that, said first compensation transistor is P type TFT or N type TFT.
5. like each described AMOLED compensating circuit dot structure in the claim 1～4, it is characterized in that, also comprise: reference power source and reset transistor,
The grid of said reset transistor connects said reference power source, and source electrode connects said earthing pole, and drain electrode connects the grid of said driving transistors, the signal of the said driving transistors that is used to reset.
6. AMOLED compensating circuit dot structure as claimed in claim 5 is characterized in that, said reset transistor is P type TFT or is N type TFT.
7. an AMOLED display panel is characterized in that, the AMOLED compensating circuit dot structure in the said panel is each described AMOLED compensating circuit dot structure in the claim 1～6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202516149U CN202120574U (en) | 2011-07-15 | 2011-07-15 | AMOLED compensating circuit pixel structure and AMOLED display panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202516149U CN202120574U (en) | 2011-07-15 | 2011-07-15 | AMOLED compensating circuit pixel structure and AMOLED display panel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651239A (en) * | 2012-03-29 | 2012-08-29 | 京东方科技集团股份有限公司 | Shift register, driver circuit and display device |
| CN102820006A (en) * | 2012-08-02 | 2012-12-12 | 京东方科技集团股份有限公司 | Pixel circuit for compensating shift of threshold voltage and thin film transistor backplane |
| CN110211546A (en) * | 2019-05-30 | 2019-09-06 | 深圳市华星光电半导体显示技术有限公司 | Thin-film transistor circuit and display device |
| CN111028767A (en) * | 2019-12-06 | 2020-04-17 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit and driving method |
-
2011
- 2011-07-15 CN CN2011202516149U patent/CN202120574U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651239A (en) * | 2012-03-29 | 2012-08-29 | 京东方科技集团股份有限公司 | Shift register, driver circuit and display device |
| CN102651239B (en) * | 2012-03-29 | 2014-06-18 | 京东方科技集团股份有限公司 | Shift register, driver circuit and display device |
| US8929506B2 (en) | 2012-03-29 | 2015-01-06 | Boe Technology Group Co., Ltd. | Shift register, driving circuit, and display apparatus |
| CN102820006A (en) * | 2012-08-02 | 2012-12-12 | 京东方科技集团股份有限公司 | Pixel circuit for compensating shift of threshold voltage and thin film transistor backplane |
| CN102820006B (en) * | 2012-08-02 | 2015-10-14 | 京东方科技集团股份有限公司 | A kind of image element circuit of compensating threshold voltage drift and thin film transistor backplane |
| CN110211546A (en) * | 2019-05-30 | 2019-09-06 | 深圳市华星光电半导体显示技术有限公司 | Thin-film transistor circuit and display device |
| CN111028767A (en) * | 2019-12-06 | 2020-04-17 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit and driving method |
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Granted publication date: 20120118 |
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