CN202601140U - AMOLED pixel drive circuit - Google Patents
AMOLED pixel drive circuit Download PDFInfo
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- CN202601140U CN202601140U CN2012202636338U CN201220263633U CN202601140U CN 202601140 U CN202601140 U CN 202601140U CN 2012202636338 U CN2012202636338 U CN 2012202636338U CN 201220263633 U CN201220263633 U CN 201220263633U CN 202601140 U CN202601140 U CN 202601140U
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Abstract
The utility model relates to the field of electronic circuits, in particular to an AMOLED (Active Matrix Organic Light Emitting Diode) pixel drive circuit. The AMOLED pixel drive circuit is built by seven P-type thin film transistors and one capacitor and is provided with four signal input wires, namely, a first scanning signal wire, a second scanning signal wire, a data signal wire and a control signal wire, and a threshold voltage Vth and an external input voltage Vdd can be compensated in the AMOLED driving process. The utility model has the benefits that the threshold voltage Vth and the external input power supply voltage Vdd can be compensated simultaneously for the AMOLED drive circuit, and the AMOLED display effect can be effectively improved. The utility model is particularly suitable for AMOLED pixel drive circuits.
Description
Technical field
The utility model relates to electronic circuit technology, relates to a kind of AMOLED pixel-driving circuit specifically.
Background technology
AMOLED (active matrix organic light-emitting diode (AMOLED) panel) is called as display technique of future generation, and present AMOLED pixel-driving circuit is as shown in Figure 1: include OLED, capacitor C, the first transistor TFT1, transistor seconds TFT 2, the 3rd transistor T FT3, the 4th transistor T FT4, the 5th transistor T FT5 and the 6th transistor PTFT; Wherein, The grid of the first transistor TFT1 connects first scan signal line, source electrode connects data signal line, an end of drain electrode connection capacitor C and the source electrode of transistor seconds TFT2; The grid of transistor seconds TFT2 connects second scan signal line; The grid of the 3rd transistor T FT3 connects source electrode, the drain electrode that first scan signal line, source electrode connect the drain electrode of the 4th transistor T FT4 and the 6th transistor PTFT and is connected the other end of capacitor C and the grid of the 6th transistor PTFT; Positive pole, grid that the source electrode of the 5th transistor T FT5 connects the drain electrode of the 6th transistor PTFT and Organic Light Emitting Diode are connected first scan signal line; The source electrode of the 4th transistor T FT4 connects positive source Vdd, and the drain electrode of the drain electrode of transistor seconds TFT2, the 5th transistor T FT5 and the negative pole of Organic Light Emitting Diode all are connected power cathode Vss.
As shown in Figure 2; The present concrete principle of work of AMOLED pixel-driving circuit is: in first scan signal line, second scan signal line and data signal line input T (1) stage; The first transistor TFT1, transistor seconds TFT2, the 3rd transistor T FT3 and the 4th all conductings of transistor T FT4; Capacitor C charging this moment, the A point voltage will be near Vdd; In T (2) stage; The first transistor TFT1, the 3rd transistor T FT3 and the 5th transistor T FT5 conducting; Transistor seconds TFT2 and the 4th transistor T FT4 end; This moment, the A point voltage will be through the 3rd transistor T FT3, the 6th transistor T FT6 and the 5th transistor T FT5 discharge, and voltage becomes transistorized threshold voltage Vth (needed grid was to the bias voltage of source electrode when threshold voltage Vth was meant transistor turns), and the B point voltage is maintained data signal line voltage Vdata; In T (3) stage, the first transistor TFT1, transistor seconds TFT2, the 3rd transistor T FT3, the 4th transistor T FT4 and the 5th transistor T FT5 all end, and this stage A, B two point voltages remain unchanged; In T (4) stage; The first transistor TFT1, the 3rd transistor T FT3 and the 5th transistor T FT5 end; Transistor seconds TFT2 and the 4th transistor T FT4 conducting, this moment, Organic Light Emitting Diode was luminous, and the B point voltage becomes 0; The saltus step of A point voltage is to Vth+|Vdata|, thus the compensation of realization threshold voltage Vth.Though present AMOLED pixel-driving circuit has been realized the compensation of threshold voltage Vth, supply voltage Vdd has the loss of voltage along with cabling, make each pixel Vth and Vdd is not of uniform size causes, cause the decline of AMOLED display quality.
The utility model content
The utility model technical matters to be solved is exactly the deficiency to existing AMOLED pixel-driving circuit, proposes a kind of driving circuit that can realize surge valve threshold voltage Vth and supply voltage Vdd simultaneously, improves AMOLED screen display quality.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of AMOLED pixel-driving circuit comprises: Organic Light Emitting Diode, electric capacity, a P type thin film transistor (TFT), the 2nd P type thin film transistor (TFT), the 3rd P type thin film transistor (TFT), the 4th P type thin film transistor (TFT), the 5th P type thin film transistor (TFT), the 6th P type thin film transistor (TFT) and the 7th P type thin film transistor (TFT);
The grid of the one P type thin film transistor (TFT) connects first scan signal line, source electrode is connected with the drain electrode of the 4th P type thin film transistor (TFT) and an end of electric capacity; The source electrode of the 2nd P type thin film transistor (TFT) connects that data signal line, drain electrode are connected with the source electrode of the 3rd P type thin film transistor (TFT), grid and the drain electrode of the 3rd P type thin film transistor (TFT) and the grid of the 6th P type thin film transistor (TFT) and the other end of electric capacity are connected; The grid of the 3rd P type thin film transistor (TFT) connects second scan signal line; The grid connection control signal line of the 4th P type thin film transistor (TFT) and the 5th P type thin film transistor (TFT); The source electrode of the 4th P type thin film transistor (TFT) is connected with the drain electrode of the 5th P type thin film transistor (TFT) and the source electrode of the 6th P type thin film transistor (TFT); The grid of the 7th P type thin film transistor (TFT) connects the other end of first scan signal line, source electrode connection electric capacity; The drain electrode of the 6th P type thin film transistor (TFT) is connected with the positive pole of Organic Light Emitting Diode; The source electrode of the drain electrode of the one P type thin film transistor (TFT), the 7th P type thin film transistor (TFT) and the negative pole of Organic Light Emitting Diode all are connected with power cathode; The source electrode of the 5th P type thin film transistor (TFT) is connected with positive source, and the 2nd P type thin film transistor (TFT) and the 6th P type thin film transistor (TFT) have equal threshold voltage.
The beneficial effect of the utility model is that realization can highly effective raising AMOLED display effect to AMOLED driving circuit while surge valve threshold voltage Vth and outside input supply voltage Vdd.
Description of drawings
Fig. 1 is traditional AMOLED pixel-driving circuit synoptic diagram;
Fig. 2 is traditional AMOLED pixel-driving circuit principle of work synoptic diagram;
Fig. 3 is the AMOLED pixel-driving circuit synoptic diagram of the utility model;
Fig. 4 is the AMOLED pixel-driving circuit principle of work synoptic diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further to describe.
The utility model proposes a kind of novel AMOLED pixel-driving circuit to the deficiency of conventional art, improves the display quality of AMOLED panel.With respect to conventional art, its improvement is: all adopt P type thin film transistor (TFT), make entire circuit more stable; Adopt the method for coupling DTFT, realize surge valve threshold voltage Vth and external input voltage Vdd simultaneously, thereby effectively improve the display effect of AMOLED.
As shown in Figure 3; AMOLED pixel-driving circuit in the utility model includes OLED OLED, capacitor C, a P type thin film transistor (TFT) PTFT1, the 2nd P type thin film transistor (TFT) PTFT2, the 3rd P type thin film transistor (TFT) PTFT3, the 4th P type thin film transistor (TFT) PTFT4, the 5th P type thin film transistor (TFT) PTFT5 and the 6th P type thin film transistor (TFT) PTFT6; The grid of the one P type thin film transistor (TFT) PTFT1 connects first scan signal line, source electrode is connected with the drain electrode of the 4th P type thin film transistor (TFT) PTFT4 and an end of capacitor C; The source electrode of the 2nd P type thin film transistor (TFT) PTFT2 connects that data signal line, drain electrode are connected with the source electrode of the 3rd P type thin film transistor (TFT) PTFT3, grid and the drain electrode of the 3rd P type thin film transistor (TFT) PTFT3 and the grid of the 6th P type thin film transistor (TFT) PTFT6 and the other end of capacitor C are connected; The grid of the 3rd P type thin film transistor (TFT) PTFT3 connects second scan signal line; The grid connection control signal line of the 4th P type thin film transistor (TFT) PTFT4 and the 5th P type thin film transistor (TFT) PTFT5; The source electrode of the 4th P type thin film transistor (TFT) PTFT4 is connected with the drain electrode of the 5th P type thin film transistor (TFT) PTFT5 and the source electrode of the 6th P type thin film transistor (TFT) PTFT6; The grid of the 7th P type thin film transistor (TFT) PTFT7 connects the other end of first scan signal line, source electrode connection capacitor C; The drain electrode of the 6th P type thin film transistor (TFT) PTFT6 is connected with the positive pole of Organic Light Emitting Diode OLED; The source electrode of the drain electrode of the one P type thin film transistor (TFT) PTFT1, the 7th P type thin film transistor (TFT) PTFT7 and the negative pole of Organic Light Emitting Diode OLED all are connected with power cathode VSS, and the source electrode of the 5th P type thin film transistor (TFT) PTFT5 is connected with positive source VDD.
Wherein the parameter of the 2nd P type thin film transistor (TFT) PTFT2 and the 6th P type thin film transistor (TFT) PTFT6 is mated each other, has equal threshold voltage, their production location next-door neighbour in side circuit.
Specify the principle of work of the utility model below in conjunction with accompanying drawing 4: in sequential cycle T (1) stage; First scan signal line is that low level, second scan signal line are that high level, data signal line are that low level and control signal wire are high level; This moment the one P type thin film transistor (TFT) PTFT1 and the 7th P type thin film transistor (TFT) PTFT7 conducting; The 3rd P type thin film transistor (TFT) PTFT3, the 4th P type thin film transistor (TFT) PTFT4 and the 5th P type thin film transistor (TFT) PTFT5 end; Two of capacitor C all directly are communicated with the voltage negative pole, so the B terminal voltage of capacitor C and A terminal voltage are 0; In T (2) stage; First scan signal line is that high level, second scan signal line are that low level, data signal line are that high level and control signal wire are high level; This moment, the one P type thin film transistor (TFT) PTFT1 and the 7th P type thin film transistor (TFT) PTFT7 ended; The 2nd P type thin film transistor (TFT) PTFT2, the 3rd P type thin film transistor (TFT) PTFT3 conducting; The 4th P type thin film transistor (TFT) PTFT4 and the 5th P type thin film transistor (TFT) PTFT5 end, this moment Vdata to the capacitor C input voltage, the A terminal voltage of capacitor C is: Va=Vdata+Vth through the 2nd P type thin film transistor (TFT) PTFT2 and the 3rd P type thin film transistor (TFT) PTFT3; In T (3) stage; First scan signal line is that high level, second scan signal line are that high level, data signal line are that low level and control signal wire are low level; A P type thin film transistor (TFT) PTFT1, the 3rd P type thin film transistor (TFT) PTFT3 and the 7th P type thin film transistor (TFT) PTFT7 end at this moment; The 2nd P type thin film transistor (TFT) PTFT2, the 4th P type thin film transistor (TFT) PTFT4, the 5th P type thin film transistor (TFT) PTFT5 and the 6th P type thin film transistor (TFT) PTFT6 conducting; This moment, capacitor C was communicated with the anodal VDD of supply voltage, and positive source VDD charges to capacitor C through the 4th P type thin film transistor (TFT) PTFT4 and the 5th P type thin film transistor (TFT) PTFT5, and the voltage jump amount of the B end of capacitor C is VDD; The A of capacitor C holds thereupon, and the voltage jump amount is VDD; The A terminal voltage control of capacitor C is through the luminous electric current of the 6th P type thin film transistor (TFT) PTFT6 driving OLED, and this moment, the A terminal voltage of capacitor C was Va=Vdata+Vth+Vdd, because the 2nd P type thin film transistor (TFT) PTFT2 and the 6th P type thin film transistor (TFT) PTFT6 mate pipe each other; Their threshold voltage Vth equates; The 6th P type thin film transistor (TFT) PTFT6 there is Vgs-Vth=Vdata (Vgs be the grid of PTFT and the voltage between the source electrode), thereby has eliminated threshold voltage Vth and supply voltage Vdd influence, according to the OLED current formula I=K (Vgs-Vth) that flows through OLED
2Can know, compensate after-current I with more stable when realizing, thereby effectively improve the AMOLED display quality threshold voltage Vth and supply voltage Vdd.
Claims (1)
1. an AMOLED pixel-driving circuit comprises: Organic Light Emitting Diode, electric capacity, a P type thin film transistor (TFT), the 2nd P type thin film transistor (TFT), the 3rd P type thin film transistor (TFT), the 4th P type thin film transistor (TFT), the 5th P type thin film transistor (TFT), the 6th P type thin film transistor (TFT) and the 7th P type thin film transistor (TFT);
The grid of the one P type thin film transistor (TFT) connects first scan signal line, source electrode is connected with the drain electrode of the 4th P type thin film transistor (TFT) and an end of electric capacity; The source electrode of the 2nd P type thin film transistor (TFT) connects that data signal line, drain electrode are connected with the source electrode of the 3rd P type thin film transistor (TFT), grid and the drain electrode of the 3rd P type thin film transistor (TFT) and the grid of the 6th P type thin film transistor (TFT) and the other end of electric capacity are connected; The grid of the 3rd P type thin film transistor (TFT) connects second scan signal line; The grid connection control signal line of the 4th P type thin film transistor (TFT) and the 5th P type thin film transistor (TFT); The source electrode of the 4th P type thin film transistor (TFT) is connected with the drain electrode of the 5th P type thin film transistor (TFT) and the source electrode of the 6th P type thin film transistor (TFT); The grid of the 7th P type thin film transistor (TFT) connects the other end of first scan signal line, source electrode connection electric capacity; The drain electrode of the 6th P type thin film transistor (TFT) is connected with the positive pole of Organic Light Emitting Diode; The source electrode of the drain electrode of the one P type thin film transistor (TFT), the 7th P type thin film transistor (TFT) and the negative pole of Organic Light Emitting Diode all are connected with power cathode; The source electrode of the 5th P type thin film transistor (TFT) is connected with positive source, and the 2nd P type thin film transistor (TFT) and the 6th P type thin film transistor (TFT) have equal threshold voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202636338U CN202601140U (en) | 2012-06-06 | 2012-06-06 | AMOLED pixel drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202636338U CN202601140U (en) | 2012-06-06 | 2012-06-06 | AMOLED pixel drive circuit |
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| CN202601140U true CN202601140U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012202636338U Expired - Fee Related CN202601140U (en) | 2012-06-06 | 2012-06-06 | AMOLED pixel drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102682706A (en) * | 2012-06-06 | 2012-09-19 | 四川虹视显示技术有限公司 | AMOLED (active matrix/organic light emitting diode) pixel driving circuit |
| WO2016095697A1 (en) * | 2014-12-17 | 2016-06-23 | 昆山国显光电有限公司 | Active matrix organic light emitting display and controlling method thereof |
-
2012
- 2012-06-06 CN CN2012202636338U patent/CN202601140U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102682706A (en) * | 2012-06-06 | 2012-09-19 | 四川虹视显示技术有限公司 | AMOLED (active matrix/organic light emitting diode) pixel driving circuit |
| CN102682706B (en) * | 2012-06-06 | 2014-07-09 | 四川虹视显示技术有限公司 | AMOLED (active matrix/organic light emitting diode) pixel driving circuit |
| WO2016095697A1 (en) * | 2014-12-17 | 2016-06-23 | 昆山国显光电有限公司 | Active matrix organic light emitting display and controlling method thereof |
| US10304391B2 (en) | 2014-12-17 | 2019-05-28 | Kunshan Go-Visionox Opto-Electronics Co., Ltd. | Active matrix organic light-emitting display and controlling method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20170606 |
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| CF01 | Termination of patent right due to non-payment of annual fee |