CN202584685U - Pixel unit drive circuit capable of improving AMOLED panel brightness stability - Google Patents
Pixel unit drive circuit capable of improving AMOLED panel brightness stability Download PDFInfo
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- CN202584685U CN202584685U CN2012201124760U CN201220112476U CN202584685U CN 202584685 U CN202584685 U CN 202584685U CN 2012201124760 U CN2012201124760 U CN 2012201124760U CN 201220112476 U CN201220112476 U CN 201220112476U CN 202584685 U CN202584685 U CN 202584685U
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Abstract
The utility model relates to the plane display technology field, particularly to a pixel unit drive circuit capable of improving AMOLED panel brightness stability. The pixel unit drive circuit is respectively connected with a data signal line used for transmitting the display data, a scanning signal line used for transmitting control signals, a power supply voltage line used for providing drive voltage, and an organic light-emitting diode used for shining according to the display data corresponding to the data signal line, wherein an organic light-emitting diode driving voltage negative feedback circuit used for regulating the driving voltage of the organic light-emitting diode in a reverse direction according to the changes of the current passing through the organic light-emitting diode is arranged between the power supply voltage line and the organic light-emitting diode. The pixel unit drive circuit of the utility model makes the current of the organic light-emitting diode be kept at a relatively invariant level by regulating the driving voltage of the organic light-emitting diode in a reverse direction, thereby improving the image brightness stability of the AMOLED panel.
Description
Technical field
The utility model belongs to display technique field, plane, relates in particular to a kind of pixel cell driving circuit that can improve AMOLED panel luminance stability.
Background technology
AMOLED (Active Matrix/Organic Light Emitting Diode; Active matrix organic light-emitting diode) panel is compared traditional liquid crystal panel; Have characteristics such as reaction velocity is very fast, contrast is higher, the visual angle is wider, more and more come into one's own at present.In order to realize the superperformance of AMOLED panel, AMOLED pixel cell driving circuit is particularly important.
Existing AMOLED pixel cell driving circuit is as shown in Figure 1, and this driving circuit comprises two transistors and an electric capacity, and one of them transistor is a switch transistor T 1, and Scan controls by scan signal line, and purpose is the input for control data signal line Data; Another transistor is driving tube T2, and control OLED (Organic Light Emitting Diode, Organic Light Emitting Diode) is luminous; Cs is a MM CAP, is used for keeping the voltage that grid applied to driving tube T2 in non-scan period, and foregoing circuit is called 2T1C pixel cell driving circuit for short.
The principle of work of above-mentioned 2T1C pixel cell driving circuit is (here supposition all be the PMOS transistor) as follows: as sweep signal Vscan (cycle is T) when choosing; Be low level when (t1 time period); Switch transistor T 1 is opened; Data-signal Vdata (cycle is Temt) charges to MM CAP Cs through the passage between the source-drain electrode of switch transistor T 1; Simultaneously, this voltage acts on the grid of driving tube T2, makes driving tube T2 be operated in magnifying state (state of saturation), and driving OLED is luminous; When sweep signal Vscan is high level when (t2 time period), switch transistor T 1 is in cut-off state, and data-signal Vdata also just can not conduct to the grid of driving tube T2; At this moment; MM CAP Cs two ends are owing to the shutoff of switch transistor T 1 do not had the to release channel of electric charge; Thereby MM CAP Cs voltage remains unchanged in theory, makes driving tube T2 still be in magnifying state, continues to keep the luminous of OLED thus; OLED is in Current Control, and its relational expression is:
Ioled＝K(Vsg-|Vth|)
2
Here, Ioled is the drain-source current through OLED; K=μ CoxW/2L; Vsg is the source gate voltage of driving tube T2; | Vth| is the absolute value of the threshold voltage vt h of driving tube T2.When the grid of driving tube T2 applies bias voltage, long-term when in running order, driving tube T2 will produce characteristic drift, and promptly its threshold voltage can change, and causes also respective change of Ioled.Because OLED brightness is directly proportional with drain-source current, OLED brightness is respective change also, therefore finally causes images displayed brightness to become unstable.
The utility model content
In view of this, the utility model provides a kind of pixel cell driving circuit that can improve AMOLED panel luminance stability, helps to remedy the harmful effect that factor such as driving element threshold voltage shift is brought, and keeps the brightness constancy of AMOLED panel.
For solving above technical matters; The technical scheme that the utility model provides is: a kind of pixel cell driving circuit that can improve AMOLED panel luminance stability; Respectively with the data signal line that is used for the transmitting and displaying data, be used for transmission of control signals scan signal line, be used to that the power voltage line of driving voltage is provided and be used for according to the corresponding video data of said data signal line and luminous Organic Light Emitting Diode is connected; Between said power voltage line and said Organic Light Emitting Diode, be provided with OLED driving voltage negative-feedback circuit, be used for according to the said Organic Light Emitting Diode reverse driving voltage of regulating said Organic Light Emitting Diode of change in current of flowing through.
More excellent ground; The on-off circuit and the driving circuit that comprise serial connection; The input end empty profit system end of said on-off circuit inserts said scan signal line and said data signal line respectively; The voltage end of said driving circuit inserts said power voltage line, and the output terminal of said driving circuit is connected to said Organic Light Emitting Diode, and said Organic Light Emitting Diode driving voltage negative-feedback circuit is connected between said driving circuit and the said power voltage line.
More excellent ground, said on-off circuit comprises the PMOS switching tube, said driving circuit comprises the PMOS driving tube; The grid of said switching tube connects said scan signal line; The source electrode of said switching tube connects said data signal line, and the drain electrode of said switching tube connects the grid of said driving tube, and the source electrode of said driving tube connects said power voltage line; The drain electrode of said driving tube is connected to said Organic Light Emitting Diode, and said Organic Light Emitting Diode is connected to ground.
More excellent ground is connected to MM CAP between the grid of said driving tube and the source electrode of said driving tube.
More excellent ground, said Organic Light Emitting Diode driving voltage negative-feedback circuit is connected between the source electrode and said power voltage line of said driving tube.
More excellent ground, said Organic Light Emitting Diode driving voltage negative-feedback circuit comprises feedback resistance, the said power voltage line of a termination of said feedback resistance, the said source electrode that connects said driving tube of another termination of said feedback resistance.
Compared with prior art; The utility model pixel cell driving circuit is provided with organic light emitting diode driving voltage negative-feedback circuit between power voltage line and Organic Light Emitting Diode; It is through the reverse driving voltage of regulating Organic Light Emitting Diode; Can remedy the influence that Organic Light Emitting Diode brings because of factors such as driving element threshold voltage shifts, make the current stabilization of Organic Light Emitting Diode, finally improve the brightness of image stability of AMOLED panel in comparatively constant level.
Description of drawings
Fig. 1 is the circuit diagram of existing pixel cell driving circuit;
Fig. 2 is the oscillogram of sweep signal among Fig. 1, data-signal;
Fig. 3 is the circuit diagram of the utility model pixel cell driving circuit.
Embodiment
The core concept of the utility model is; Organic light emitting diode driving voltage negative-feedback circuit is set; Through the driving voltage of reverse adjusting Organic Light Emitting Diode, make the current stabilization of Organic Light Emitting Diode in comparatively constant level, finally improve the brightness of image stability of AMOLED panel.
In order to make those skilled in the art understand the technical scheme of the utility model better, the utility model is done further to specify below in conjunction with accompanying drawing and specific embodiment.
Referring to Fig. 3, be the circuit diagram of the utility model pixel cell driving circuit preferred embodiment.This kind can improve the pixel cell driving circuit of AMOLED panel luminance stability; Respectively be used for transmitting and displaying data signal line Data, be used for transmission of control signals signal scanning line Scan, be used to provide driving voltage power voltage line Vdd, be used for according to the corresponding video data of signal Vdata and luminous Organic Light Emitting Diode OLED is connected; Wherein be provided with organic light emitting diode driving voltage negative-feedback circuit 300, oppositely regulate its driving voltage in order to the change in current of flowing through according to Organic Light Emitting Diode OLED.
In the present embodiment; Driving voltage through reverse adjusting OLED can remedy the influence that brings because of factors such as OLED driving element threshold voltage shifts, makes the current stabilization of OLED in comparatively constant level; Finally improved the brightness of image stability of AMOLED panel, below further described.
As shown in Figure 3, this pixel cell driving circuit comprises the on-off circuit 100 and driving circuit 200 of serial connection, and wherein: on-off circuit 100 inserts scan signal line Scan and data signal line Data; Driving circuit 200 inserts power voltage line Vdd, and is connected to Organic Light Emitting Diode OLED; Organic light emitting diode driving voltage negative-feedback circuit 300 is connected between driving circuit 200 and the power voltage line Vdd.
In the present embodiment; On-off circuit 100, driving circuit 200 and Organic Light Emitting Diode driving voltage negative-feedback circuit 300 all can adopt multiple concrete circuit structure; They are that available resolution element constitutes; Also available intelligent object constitutes, below for adopting the instance of CMOS pipe (in particular cases also can adopt triode).
As shown in Figure 3, the pixel cell driving circuit of this embodiment comprises:
PMOS switch transistor T 1 constitutes on-off circuit 100; It has the source electrode that is connected with data signal line Data, the grid that is connected with scan signal line Scan and the drain electrode that is connected with driving tube T2 grid; The break-make of sweep trace Scan CS pipe T1 wherein, thereby the input of control data line Data;
PMOS driving tube T2 constitutes driving circuit 200, and it has grid g, source electrode s that is connected with power voltage line Vdd and the drain electrode that is connected with Organic Light Emitting Diode OLED that is connected with switch transistor T 1 drain electrode, and this Organic Light Emitting Diode OLED is connected to ground GND;
MM CAP Cs is connected between the grid and power voltage line Vdd of drain electrode, T2 driving tube of switch transistor T 1, so that form charge circuit;
Resistance R 1 constitutes organic light emitting diode driving voltage negative-feedback circuit 300, and it is connected MM CAP Cs, between the source electrode s and power voltage line Vdd of T2 driving tube, remedies the threshold voltage shift of OLED driving element thus, finally keeps the OLED brightness constancy.
The principle of work of the pixel cell driving circuit of present embodiment is described below in conjunction with Fig. 2 and Fig. 3:
When sweep signal Vscan chose, when being low level, switch transistor T 1 was opened, and data-signal Vdata charges to MM CAP Cs through the passage between the source-drain electrode of switch transistor T 1; Simultaneously, this voltage acts on the grid of driving tube T2, makes driving tube T2 be operated in magnifying state (state of saturation), and driving OLED is luminous; When sweep signal Vscan was high level, switch transistor T 1 was in cut-off state, and data-signal Vdata also just can not conduct the grid of driving tube T2; At this moment; MM CAP Cs two ends are owing to the shutoff of switch transistor T 1 do not had the to release channel of electric charge; MM CAP Cs voltage remains unchanged in theory, makes driving tube T2 still be in magnifying state, continues to keep the luminous of OLED; OLED is in current hollow system, and its relational expression is: Ioled=K (Vsg-|Vth|)
2
In this frame time Temt, when the threshold voltage of driving tube T2 produces drift, for example | when Vth| became big, Ioled will diminish, and so made the voltage at resistance R 1 two ends also diminish, and promptly the Vs point voltage becomes big; Because Vsg=Vs-Vg, Vs become big, Vg is constant, so Vsg also becomes greatly, it is big that Ioled also can become thereupon; Otherwise, when | when Vth| diminished, Ioled will become greatly, and so the voltage at resistance R 1 two ends also becomes greatly, and promptly the Vs point voltage diminishes; Because Vsg=Vs-Vg, Vs diminishes, and Vg is constant, so Vsg also diminishes, Ioled also can diminish thereupon.Therefore, resistance R 1 has the negative feedback function, when causing Ioled to change owing to threshold voltage vt h; Resistance R 1 is through the negative feedback function; Make Ioled produce opposite variation, remedied the harmful effect that threshold voltage brings thus, thereby improved the brightness of image stability of AMOLED panel.
Need to prove; This pixel cell driving circuit is except the harmful effect that can remedy threshold voltage shift and bring, and other factors such as variations such as light, temperature cause the change of Ioled big or diminish, and resistance R 1 equally can be through the negative feedback function; Make drain-source current Ioled produce inverse variation; Promptly diminish or become big, thereby obtain more stable drain-source current Ioled, finally stablize the brightness of image of AMOLED panel.
Only be the preferred implementation of the utility model below, should be pointed out that above-mentioned preferred implementation should not be regarded as the restriction to the utility model, the protection domain of the utility model should be as the criterion with claim institute restricted portion.For those skilled in the art, in spirit that does not break away from the utility model and scope, can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (6)
1. one kind can be improved the stable pixel cell driving circuit of AMOLED panel luminance; Respectively with the data signal line that is used for the transmitting and displaying data, be used for transmission of control signals scan signal line, be used to that the power voltage line of driving voltage is provided and be used for according to the corresponding video data of said data signal line and luminous Organic Light Emitting Diode is connected; It is characterized in that; Between said power voltage line and said Organic Light Emitting Diode, be provided with OLED driving voltage negative-feedback circuit, be used for according to the said Organic Light Emitting Diode reverse driving voltage of regulating said Organic Light Emitting Diode of change in current of flowing through.
2. the pixel cell driving circuit that can improve AMOLED panel luminance stability as claimed in claim 1; It is characterized in that; The on-off circuit and the driving circuit that comprise serial connection; The input end empty profit system end of said on-off circuit inserts said scan signal line and said data signal line respectively; The voltage end of said driving circuit inserts said power voltage line, and the output terminal of said driving circuit is connected to said Organic Light Emitting Diode, and said Organic Light Emitting Diode driving voltage negative-feedback circuit is connected between said driving circuit and the said power voltage line.
3. the pixel cell driving circuit that can improve AMOLED panel luminance stability as claimed in claim 2; It is characterized in that said on-off circuit comprises the PMOS switching tube, said driving circuit comprises the PMOS driving tube; The grid of said switching tube connects said scan signal line; The source electrode of said switching tube connects said data signal line, and the drain electrode of said switching tube connects the grid of said driving tube, and the source electrode of said driving tube connects said power voltage line; The drain electrode of said driving tube is connected to said Organic Light Emitting Diode, and said Organic Light Emitting Diode is connected to ground.
4. the pixel cell driving circuit that can improve AMOLED panel luminance stability as claimed in claim 3 is characterized in that, is connected to MM CAP between the grid of said driving tube and the source electrode of said driving tube.
5. like claim 3 or the 4 described pixel cell driving circuits that can improve AMOLED panel luminance stability, it is characterized in that said Organic Light Emitting Diode driving voltage negative-feedback circuit is connected between the source electrode and said power voltage line of said driving tube.
6. the pixel cell driving circuit that can improve AMOLED panel luminance stability as claimed in claim 5; It is characterized in that; Said Organic Light Emitting Diode driving voltage negative-feedback circuit comprises feedback resistance; The said power voltage line of one termination of said feedback resistance, the said source electrode that connects said driving tube of another termination of said feedback resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012201124760U CN202584685U (en) | 2012-03-22 | 2012-03-22 | Pixel unit drive circuit capable of improving AMOLED panel brightness stability |
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| CN2012201124760U CN202584685U (en) | 2012-03-22 | 2012-03-22 | Pixel unit drive circuit capable of improving AMOLED panel brightness stability |
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Cited By (11)
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| CN103309507A (en) * | 2013-05-30 | 2013-09-18 | 京东方科技集团股份有限公司 | Touch display driving circuit and method and display device |
| WO2015172411A1 (en) * | 2014-05-15 | 2015-11-19 | 深圳市华星光电技术有限公司 | Panel drive circuit and panel drive method |
| CN109410840A (en) * | 2018-11-13 | 2019-03-01 | 中国电子科技集团公司第五十五研究所 | A kind of silicon substrate micro display pixel circuit of high uniformity Low dark curient |
| CN109599061A (en) * | 2018-11-13 | 2019-04-09 | 中国电子科技集团公司第五十五研究所 | A kind of silicon substrate micro display pixel circuit |
| WO2020020118A1 (en) * | 2018-07-24 | 2020-01-30 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof and display device |
| CN111161673A (en) * | 2019-12-31 | 2020-05-15 | Oppo广东移动通信有限公司 | Electronic equipment and display screen thereof |
| CN111179838A (en) * | 2020-02-21 | 2020-05-19 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit, display panel and method for improving low gray scale uniformity of display panel |
| CN111341273A (en) * | 2018-12-29 | 2020-06-26 | Tcl集团股份有限公司 | Light emitting unit, assembly, circuit, display device and backlight control method |
| CN111833815A (en) * | 2020-07-31 | 2020-10-27 | 合肥京东方卓印科技有限公司 | Pixel driving circuit and method, display panel and driving method |
| CN111883063A (en) * | 2020-07-17 | 2020-11-03 | 合肥维信诺科技有限公司 | Pixel circuit, display panel and display device |
| CN114974116A (en) * | 2022-05-31 | 2022-08-30 | 惠科股份有限公司 | Pixel driving circuit and pixel driving method |
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2012
- 2012-03-22 CN CN2012201124760U patent/CN202584685U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103309507A (en) * | 2013-05-30 | 2013-09-18 | 京东方科技集团股份有限公司 | Touch display driving circuit and method and display device |
| WO2014190621A1 (en) * | 2013-05-30 | 2014-12-04 | 京东方科技集团股份有限公司 | Touch display drive circuit, method, and display device |
| CN103309507B (en) * | 2013-05-30 | 2016-05-11 | 京东方科技集团股份有限公司 | A kind of display driver circuit, method and display unit of touching |
| WO2015172411A1 (en) * | 2014-05-15 | 2015-11-19 | 深圳市华星光电技术有限公司 | Panel drive circuit and panel drive method |
| WO2020020118A1 (en) * | 2018-07-24 | 2020-01-30 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof and display device |
| US11217183B2 (en) | 2018-07-24 | 2022-01-04 | Boe Technology Group Co., Ltd. | Pixel circuit and driving method thereof and display apparatus |
| CN109410840A (en) * | 2018-11-13 | 2019-03-01 | 中国电子科技集团公司第五十五研究所 | A kind of silicon substrate micro display pixel circuit of high uniformity Low dark curient |
| CN109599061A (en) * | 2018-11-13 | 2019-04-09 | 中国电子科技集团公司第五十五研究所 | A kind of silicon substrate micro display pixel circuit |
| CN111341273B (en) * | 2018-12-29 | 2021-09-17 | Tcl科技集团股份有限公司 | Backlight control method applied to display device |
| CN111341273A (en) * | 2018-12-29 | 2020-06-26 | Tcl集团股份有限公司 | Light emitting unit, assembly, circuit, display device and backlight control method |
| CN111161673A (en) * | 2019-12-31 | 2020-05-15 | Oppo广东移动通信有限公司 | Electronic equipment and display screen thereof |
| CN111161673B (en) * | 2019-12-31 | 2022-08-16 | Oppo广东移动通信有限公司 | Electronic equipment and display screen thereof |
| CN111179838A (en) * | 2020-02-21 | 2020-05-19 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit, display panel and method for improving low gray scale uniformity of display panel |
| CN111883063A (en) * | 2020-07-17 | 2020-11-03 | 合肥维信诺科技有限公司 | Pixel circuit, display panel and display device |
| CN111833815A (en) * | 2020-07-31 | 2020-10-27 | 合肥京东方卓印科技有限公司 | Pixel driving circuit and method, display panel and driving method |
| CN111833815B (en) * | 2020-07-31 | 2022-05-31 | 合肥京东方卓印科技有限公司 | Pixel driving circuit and method, display panel and driving method |
| CN114974116A (en) * | 2022-05-31 | 2022-08-30 | 惠科股份有限公司 | Pixel driving circuit and pixel driving method |
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