CN202584686U - Pixel unit drive circuit capable of prolonging AMOLED panel service lifetime - Google Patents
Pixel unit drive circuit capable of prolonging AMOLED panel service lifetime Download PDFInfo
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- CN202584686U CN202584686U CN2012201132413U CN201220113241U CN202584686U CN 202584686 U CN202584686 U CN 202584686U CN 2012201132413 U CN2012201132413 U CN 2012201132413U CN 201220113241 U CN201220113241 U CN 201220113241U CN 202584686 U CN202584686 U CN 202584686U
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Abstract
The utility model relates to the plane display technology field, particularly to a pixel unit drive circuit capable of prolonging AMOLED panel service lifetime. 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 driving voltage, and an organic light-emitting diode used for shining according to the display data corresponding to the data signal line, The pixel unit drive circuit is provided with an organic light-emitting diode luminescence state control circuit which, connected between the power supply voltage line and the organic light-emitting diode, is used for correspondingly controlling the conduction/cut-off of the organic light-emitting diode according to the scanning voltage of the scanning signal line. The pixel unit drive circuit of the utility model utilizes the afterglow effect of the luminescent material and the sight inertia of the human eye to make sure that there is no current passing through the organic light-emitting diode during the display-data inputting time, thereby saving some power consumption, decreasing the heat productivity of the AMOLE panel, and prolonging the service lifetime of the OLED material.
Description
Technical field
The utility model relates to display technique field, plane, relates in particular to a kind of pixel cell driving circuit that can improve the AMOLED panel life-span.
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.
Fig. 2 has provided sweep signal Vscan among Fig. 1, the oscillogram of data-signal Vdata and the electric current I oled through OLED, and this drive circuit works period is divided into two parts in the wherein single scan period, is summarized as follows.
First be display data signal Vdata write application time t1, in the period, sweep signal Vscan is a high level at this section, this moment, switch transistor T 1 was opened, 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 canopy of driving tube T2 and extremely goes up, and makes driving tube T2 be operated in magnifying state (state of saturation), and driving OLED is luminous.
Second portion is for showing the t2 that holds time, and sweep signal Vscan is a low level, and switch transistor T 1 is 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 keep voltage constant owing to the shutoff of switch transistor T 1 do not had the to release channel of electric charge, make driving tube T2 still be in magnifying state, continue to keep the luminous of OLED.
As can beappreciated from fig. 2; No matter this AMOLED pixel cell driving circuit is that video data is in input time; Still in video data is held time; MM CAP Cs voltage all remains unchanged in theory, i.e. the luminous of OLED remained unchanged in this frame period always, and this state lasts till interior quilt of image element circuit next frame time gating once more always.
That is to say that in above-mentioned driving pixels circuit, in the entire frame cycle, driving tube T2 is in magnifying state always, OLED is always luminous, and former frame finishes the back and switches to next frame information, and interframe is very close to each other at once.If do not have the black signal in the signal that this pixel shows, then this driving tube T2 is in the saturation conduction state always, and this makes this OLED pixel be in luminance always, causes whole AMOLED panel heating thus, and the OLED material lifetime shortens.
The utility model content
In view of this, the utility model provides a kind of pixel cell driving circuit that can improve the AMOLED panel life-span, helps to reduce the luminous heat of panel, prolongs the material lifetime of OLED.
For solving above technical matters; The technical scheme that the utility model provides is: a kind of pixel cell driving circuit that can improve the AMOLED panel life-span; 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; Be provided with OLED luminance control circuit; Be connected between said power voltage line and the said Organic Light Emitting Diode, be used for conduction and cut-off according to the said Organic Light Emitting Diode of the corresponding control of scanning voltage of said scan signal line.
More excellent ground; The on-off circuit and the driving circuit that comprise serial connection; Said on-off circuit inserts said scan signal line and said data signal line, and said driving circuit inserts said power voltage line, and said driving circuit is connected to said Organic Light Emitting Diode; Said Organic Light Emitting Diode luminance control circuit is connected between said driving circuit and the said power voltage line, or is connected between said driving circuit and the said Organic Light Emitting Diode.
More excellent ground, said on-off circuit comprises the nmos switch pipe, said driving circuit comprises the NMOS driving tube; The canopy utmost point 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 canopy utmost point of said driving tube, and the drain electrode of said driving tube connects said power voltage line; The source 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, said Organic Light Emitting Diode luminance control circuit is connected between the source electrode and said Organic Light Emitting Diode of said driving tube.
More excellent ground; Said Organic Light Emitting Diode luminance control circuit comprises the PMOS auxiliary switch; The canopy utmost point of said auxiliary switch connects said scan signal line; The source electrode of said auxiliary switch connects the source electrode of said driving tube, and the drain electrode of said auxiliary switch is connected to said Organic Light Emitting Diode.
More excellent ground is connected to MM CAP between the canopy utmost point of said driving tube and the said power voltage line.
Compared with prior art; The utility model pixel cell driving circuit is provided with OLED luminance control circuit between power voltage line and Organic Light Emitting Diode; Can control the conduction and cut-off of Organic Light Emitting Diode according to the scanning voltage correspondence of scan signal line; The sunset glow effect through making full use of luminescent material and the visual persistence of human eye sensitization, make video data in input time the Organic Light Emitting Diode no current pass through, practice thrift the part power consumption thus; Reduce the thermal value of AMOLED panel, prolonged the serviceable life of OLED material.
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 and OLED electric current;
Fig. 3 is the circuit diagram of the utility model pixel cell driving circuit;
Fig. 4 is the oscillogram of sweep signal among Fig. 3, data-signal and OLED electric current.
Embodiment
The core concept of the utility model is, between power voltage line and Organic Light Emitting Diode, is provided with OLED luminance control circuit, can be according to the conduction and cut-off of the corresponding control of the scanning voltage Organic Light Emitting Diode of scan signal line.
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 in AMOLED panel life-span; 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 OLED luminance control circuit 300; Be connected between power voltage line and the Organic Light Emitting Diode OLED, be used for conduction and cut-off according to the corresponding control of the scanning voltage Vscan Organic Light Emitting Diode OLED of scan signal line Scan.
Thus; Through OLED luminance control circuit 300 is set between power voltage line Vdd and Organic Light Emitting Diode OLED, can make full use of the sunset glow effect of luminescent material and the visual persistence of human eye sensitization, video data interior Organic Light Emitting Diode OLED no current input time is passed through; Practice thrift the part power consumption thus; Reduce the thermal value of AMOLED panel, prolonged the serviceable life of OLED material, below further describe.
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 luminance control circuit 300 is connected between driving circuit 200 and the power voltage line Vdd, perhaps, is connected between driving circuit 200 and the Organic Light Emitting Diode OLED.
In the present embodiment; On-off circuit 100, driving circuit 200 and Organic Light Emitting Diode luminance control 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:
Nmos switch pipe T1 constitutes on-off circuit 100, and 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 the driving tube T2 canopy utmost point; The break-make of sweep trace Scan CS pipe T1, thereby the input of control data line Data;
NMOS driving tube T2 constitutes driving circuit 200, and it has canopy utmost point g, drain electrode that is connected with power voltage line Vdd and the source electrode s that is connected with switch transistor T 3 source electrodes that is connected with switch transistor T 1 drain electrode;
MM CAP Cs is connected the drain electrode of switch transistor T 1, between the grid of T2 driving tube and the power voltage line Vdd, so that form charge circuit;
PMOS switching tube (the auxiliary pipe that opens the light) T3 constitutes lumination of light emitting diode state control circuit 300; It has the canopy utmost point that is connected with scan signal line Scan; The source electrode that is connected with driving tube T2 source electrode; With the drain electrode that is connected with Organic Light Emitting Diode OLED, this Organic Light Emitting Diode OLED is connected to ground GND; Through the break-make of scan signal line Scan CS pipe T3, thus the luminance of control OLED.
This pixel cell driving circuit makes full use of the sunset glow effect of luminescent material and the visual persistence of human eye sensitization; In the existing pixel cell driving circuit that comprises two transistors and an electric capacity, increase switch transistor T 3; The switch of this switch transistor T 3 has been saved extra control line by scan signal line Scan control.
Below in conjunction with Fig. 4 the principle of work of the pixel cell driving circuit of present embodiment is described, Fig. 4 has provided the sweep signal Vscan among Fig. 3, the oscillogram of data-signal Vdata and the electric current I oled through OLED.
As shown in Figure 4, this drive circuit works period is divided into two parts in the single scan period T:
First is that writing of display data signal Vdata revolved and added time t1, and in the period, sweep signal Vscan is a high level at this section, and this moment, switch transistor T 1 was opened, and data-signal Vdata charges to MM CAP Cs through the passage between the source-drain electrode of switching tube; Simultaneously, this voltage acts on the canopy of switch transistor T 3 and extremely goes up, because switch transistor T 3 is PMOS pipes, so switch transistor T 3 is in cut-off state, driving tube T2 no current passes through, and Organic Light Emitting Diode OLED is not luminous.
Second portion is for showing the t2 that holds time, and sweep signal Vscan is a low level, and switch transistor T 1 is 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 keep voltage constant owing to the shutoff of switch transistor T 1 do not had the to release channel of electric charge; Simultaneously, switch transistor T 3 is in open mode, and driving tube T2 is in magnifying state, and OLED begins luminous.
Wherein, video data t1 input time confirms according to the afterglow effect of the employed luminous organic material of OLED device and two principal elements of visual persistence of human eye jointly.For example, t1 is 1/5 of the frame period, just practices thrift about 1/5 power consumption, has reduced the luminous heat of oled panel, has prolonged the material lifetime of OLED.
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. pixel cell driving circuit that can improve the AMOLED panel life-span; 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; Be provided with OLED luminance control circuit; Be connected between said power voltage line and the said Organic Light Emitting Diode, be used for conduction and cut-off according to the said Organic Light Emitting Diode of the corresponding control of scanning voltage of said scan signal line.
2. the pixel cell driving circuit that can improve the AMOLED panel life-span as claimed in claim 1; It is characterized in that; The on-off circuit and the driving circuit that comprise serial connection; Said on-off circuit inserts said scan signal line and said data signal line, and said driving circuit inserts said power voltage line, and said driving circuit is connected to said Organic Light Emitting Diode; Said Organic Light Emitting Diode luminance control circuit is connected between said driving circuit and the said power voltage line, or is connected between said driving circuit and the said Organic Light Emitting Diode.
3. the pixel cell driving circuit that can improve the AMOLED panel life-span as claimed in claim 2; It is characterized in that said on-off circuit comprises the nmos switch pipe, said driving circuit comprises the NMOS driving tube; The canopy utmost point 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 canopy utmost point of said driving tube, and the drain electrode of said driving tube connects said power voltage line; The source 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 the AMOLED panel life-span as claimed in claim 3 is characterized in that, said Organic Light Emitting Diode luminance control circuit is connected between the source electrode and said Organic Light Emitting Diode of said driving tube.
5. the pixel cell driving circuit that can improve the AMOLED panel life-span as claimed in claim 4; It is characterized in that; Said Organic Light Emitting Diode luminance control circuit comprises the PMOS auxiliary switch; The canopy utmost point of said auxiliary switch connects said scan signal line, and the source electrode of said auxiliary switch connects the source electrode of said driving tube, and the drain electrode of said auxiliary switch is connected to said Organic Light Emitting Diode.
6. like claim 4 or the 5 described pixel cell driving circuits that can improve the AMOLED panel life-span, it is characterized in that, be connected to MM CAP between the canopy utmost point of said driving tube and the said power voltage line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201132413U CN202584686U (en) | 2012-03-22 | 2012-03-22 | Pixel unit drive circuit capable of prolonging AMOLED panel service lifetime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201132413U CN202584686U (en) | 2012-03-22 | 2012-03-22 | Pixel unit drive circuit capable of prolonging AMOLED panel service lifetime |
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| CN202584686U true CN202584686U (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012201132413U Expired - Lifetime CN202584686U (en) | 2012-03-22 | 2012-03-22 | Pixel unit drive circuit capable of prolonging AMOLED panel service lifetime |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591125A (en) * | 2017-10-26 | 2018-01-16 | 京东方科技集团股份有限公司 | The drive circuit and driving method of a kind of electroluminescent cell, display device |
| WO2019010957A1 (en) * | 2017-07-12 | 2019-01-17 | 京东方科技集团股份有限公司 | Pixel unit circuit and driving method therefor, pixel circuit, and display apparatus |
-
2012
- 2012-03-22 CN CN2012201132413U patent/CN202584686U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019010957A1 (en) * | 2017-07-12 | 2019-01-17 | 京东方科技集团股份有限公司 | Pixel unit circuit and driving method therefor, pixel circuit, and display apparatus |
| CN107591125A (en) * | 2017-10-26 | 2018-01-16 | 京东方科技集团股份有限公司 | The drive circuit and driving method of a kind of electroluminescent cell, display device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121205 |
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| CX01 | Expiry of patent term |