CN104882094A - OLED panel drive circuit, drive method and display device - Google Patents
OLED panel drive circuit, drive method and display device Download PDFInfo
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- CN104882094A CN104882094A CN201510222515.0A CN201510222515A CN104882094A CN 104882094 A CN104882094 A CN 104882094A CN 201510222515 A CN201510222515 A CN 201510222515A CN 104882094 A CN104882094 A CN 104882094A
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Abstract
The invention discloses an OLED panel drive circuit, a drive method and a display device. The drive circuit comprises a power supply management module and a constant current mirror drive module. The output end of the power supply management module is electrically connected to an anode of an OLED light-emitting unit and the input end of the constant current mirror drive module, and is used for providing pulse power supply output to the OLED light-emitting unit and the constant current mirror drive module. The output end of the constant current mirror drive module is electrically connected to a cathode of the OLED light-emitting unit, and is used for providing constant current to the OLED light-emitting unit. The service life and the display quality of an OLED panel can be both improved while the cost and the size of the OLED panel are not increased or the LOED pixel opening ratio is not given up. Moreover, the display brightness of an OLED is adjustable.
Description
Technical field
The present invention relates to OLED display technique field, refer to a kind of oled panel driving circuit, driving method and display device particularly.
Background technology
Oled panel (display of organic electroluminescence) is as the third generation display after TFT-LCD (liquid crystal display), compared with TFT-LCD, have fast response time, high brightness, high-contrast, ultralight ultra-thin, low-power consumption, without angle limitations, operating temperature range is wide, anti-seismic performance good, can realize the advantages such as soft display, huge numbers of families come into by the display device that can predict oled panel in the near future will become versatility.
Through years of researches and development, OLED is widely used gradually in display field, but OLED also also exists some difficult problems as urgently to be resolved hurrily in life-span, show uniformity etc.In recent years, research is had to point out to mix and adopt the pulse power of constant pressure source and duty when frequency-adjustable to carry out driving OLED to improve the serviceable life of OLED, also capable field technique personnel propose some compensating circuits increasing transistor and electric capacity in OLED pixel-driving circuit to improve the display defect of OLED, but these methods can only improve the single defect of OLED, and significantly increase the cost of oled panel, volume or sacrifice the pixel aperture ratio of OLED, seriously govern the development of OLED.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of oled panel driving circuit, driving method and display device, do not increase the cost of oled panel, volume or sacrifice OLED pixel aperture ratio prerequisite under, life-span and the display quality of oled panel can be improved simultaneously.
For achieving the above object, a kind of oled panel driving circuit designed by the present invention, comprise the first transistor, signal storage capacitors and transistor seconds, the grid of described the first transistor is electrically connected with sweep signal, second electrode of described the first transistor is electrically connected with data-signal, and the 3rd electrode of described the first transistor is electrically connected with the grid of signal storage capacitors and transistor seconds respectively; The other end ground connection of described signal storage capacitors; Second electrode of described transistor seconds is connected with the cathodic electricity of OLED luminescence unit, and it also comprises power management module and constant current mirror driver module; The output terminal of described power management module is electrically connected with the anode of OLED luminescence unit and the input end of constant current mirror driver module respectively, and described power management module is used for simultaneously for OLED luminescence unit and constant current mirror driver module provide the pulse power; The output terminal of described constant current mirror driver module is electrically connected with the 3rd electrode of transistor seconds, and described constant current mirror driver module is used for providing driving constant current for OLED luminescence unit.
Further, described constant current mirror driver module comprises operational amplifier, fast diode, NMOS tube and constant current resistance, the input end in the same way of described operational amplifier is electrically connected with the output terminal of power management module, the drain electrode of described NMOS tube is electrically connected with the 3rd electrode of transistor seconds, the grid of described NMOS tube is electrically connected with the anode of fast diode, the negative electrode of described fast diode is electrically connected with the output terminal of operational amplifier, the source electrode of described NMOS tube is through constant current resistance eutral grounding, one end that described constant current resistance is connected with the source electrode of NMOS tube is electrically connected with the reverse input end of operational amplifier.
Further, described oled panel driving circuit comprises n pixel driver branch road, each described pixel driver branch road comprises described the first transistor, signal storage capacitors, transistor seconds and OLED luminescence unit, described constant current mirror driver module comprises n NMOS tube, the drain electrode of each described NMOS tube is electrically connected with the 3rd electrode of the transistor seconds of a pixel driver branch road respectively, the grid of each described NMOS tube is interconnected, and the source electrode of each described NMOS tube is interconnected.
Further, the output terminal of described power management module is electrically connected with the second electrode of described transistor seconds, 3rd electrode of described transistor seconds is electrically connected with the anode of OLED luminescence unit, and the described negative electrode of OLED luminescence unit is electrically connected with the drain electrode of NMOS tube.
Further, the pulse power that described power management module exports is positive negative pulse stuffing voltage, and the dutycycle of described positive pulse voltage is 90%-95%, and the dutycycle of described negative pulse voltage is 10%-5%.
A kind of display device, comprises oled panel driving circuit recited above.
In addition, provide a kind of driving method of oled panel driving circuit, its special character is, comprises the steps:
1) power management module exports the pulse power respectively to the anode of OLED luminescence unit and the input end of constant current mirror driver module;
2) data-signal (Vdata) and sweep signal (Scan) is sent to each pixel driver branch road.
Further, described step one also comprises, and makes to remain setting current value I by the electric current of NMOS tube when power management module exports positive pulse power supply
oled, it specifically comprises:
11) according to setting current value I
oLEDcalculate the driving current value of constant current mirror driver module, computing formula is: I=I
oled* n, wherein n equals the way of pixel driver branch road;
12) according to driving current value computing driving voltage value V, computing formula is: V=I*R, and wherein R is the resistance of constant current resistance;
13) power management module is to the in-phase input end input positive pulse voltage value V of operational amplifier.
Further, described step 2 specifically comprises:
21) charge to signal storage capacitors according to sweep signal (Scan) after the first transistor in every bar branch road receives data-signal (Vdata), data-signal (Vdata) is sent to transistor seconds by synchronous signal storage capacitors;
22) the OLED luminescence unit in branch road is communicated with corresponding NMOS tube according to data-signal (Vdata) by the transistor seconds in every bar branch road, then equal the current value by NMOS tube by the current value of OLED luminescence unit, namely set current value I
oled.
Principle of work of the present invention is:
When power management module exports positive pulse power supply, constant current mirror driver module provides driving constant current for OLED luminescence unit, and the electric current flowing through OLED luminescence unit is constantly equal to the current value I by NMOS tube
oled, thus improve the uneven defect of oled panel display brightness; When power management module exports negative pulse power supply, fast diode can block the connection of constant current mirror driver module and OLED luminescence unit, now the voltage at OLED luminescence unit two ends is reverse constant voltage, of short duration reverse biased is of value to and removes charge trap and stop foreign ion to drift electrode, thus improves the life-span of oled panel.
Wherein, the driving constant current that constant current mirror driver module provides can be determined by following formula:
The electric current then flowing through pixel driver branch road OLED luminescence unit can be determined by following formula:
Therefore export the amplitude of positive pulse power supply and driving voltage value V just can change size of current by OLED luminescence unit and gray shade scale by changing power management module.
The present invention is compared with the usefulness of prior art: utilize power management module simultaneously for OLED luminescence unit and constant current mirror driver module provide the pulse power to export, can do not increase the cost of oled panel, volume or sacrifice OLED pixel aperture ratio prerequisite under, can improve life-span and the display quality of oled panel, and the display brightness of OLED can regulate simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural drawing of oled panel driving circuit of the present invention;
Fig. 2 is the structural representation of oled panel driving circuit embodiment of the present invention;
Fig. 3 is the process flow diagram of oled panel driving method of the present invention;
In figure: 1. power management module, 2. constant current mirror driver module, 2-1. operational amplifier, 2-2. fast diode, 2-3.NMOS manages, 2-4. constant current resistance, 3.OLED luminescence unit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, oled panel driving circuit provided by the present invention, comprise the first transistor, signal storage capacitors, transistor seconds, power management module (1), constant current mirror driver module (2) and OLED luminescence unit (3), the grid of the first transistor is electrically connected with sweep signal, second electrode is electrically connected with data-signal, and the 3rd electrode is electrically connected with the grid of signal storage capacitors and transistor seconds respectively; The other end ground connection of signal storage capacitors; Second electrode of transistor seconds is connected with the cathodic electricity of OLED luminescence unit (3); The output terminal of power management module (1) is electrically connected with the anode of OLED luminescence unit (3) and the input end of constant current mirror driver module (2) respectively; The output terminal of constant current mirror driver module (2) is electrically connected with the 3rd electrode of transistor seconds.
Wherein constant current mirror driver module (2) comprises operational amplifier (2-1), fast diode (2-2), NMOS tube (2-3) and constant current resistance (2-4), the input end in the same way of operational amplifier (2-1) is electrically connected with the output terminal of power management module (1), the drain electrode of NMOS tube (2-3) is electrically connected with the 3rd electrode of transistor seconds, grid is electrically connected with the anode of fast diode (2-2), the negative electrode of fast diode (2-2) is electrically connected with the output terminal of operational amplifier (2-1), the source electrode of NMOS tube (2-3) is through constant current resistance (2-4) ground connection, one end that constant current resistance (2-4) is connected with the source electrode of NMOS tube (2-3) is electrically connected with the reverse input end of operational amplifier (2-1).
The embodiment of oled panel driving circuit of the present invention as shown in Figure 2, driving circuit comprises n pixel driver branch road, each pixel driver branch road comprises a first transistor, a signal storage capacitors, a transistor seconds and an OLED luminescence unit (3), constant current mirror driver module (2) comprises n NMOS tube (2-3), the drain electrode of each NMOS tube (2-3) is electrically connected with the 3rd electrode of the transistor seconds of a pixel driver branch road respectively, the grid of each NMOS tube (2-3) is interconnected, the source electrode of each NMOS tube (2-3) is interconnected.
As shown in Figure 3, the driving method of above-mentioned oled panel driving circuit, comprises the steps:
1) power management module (1) exports the pulse power respectively to the anode of OLED luminescence unit (3) and the input end of constant current mirror driver module (2);
11) the current value I of OLED luminescence unit (3) is flow through as required
oLEDcalculate the driving current value I of constant current mirror driver module (2), computing formula is: I=I
oled* n, wherein n equals the way of pixel driver branch road;
12) calculate the positive pulse voltage V of power management module (1) according to driving current value I, computing formula is: V=I*R, and wherein R is the resistance of described constant current resistance (2-4);
13) power management module (1) is to the in-phase input end input positive pulse voltage value V of operational amplifier (2-1);
2) data-signal (Vdata) and sweep signal (Scan) is sent to each pixel driver branch road;
21) charge to signal storage capacitors according to sweep signal (Scan) after the first transistor in every bar branch road receives data-signal (Vdata), data-signal (Vdata) is sent to transistor seconds by synchronous signal storage capacitors;
22) the OLED luminescence unit (3) in branch road is communicated with corresponding NMOS tube (2-3) according to data-signal (Vdata) by the transistor seconds in every bar branch road, then equal the current value by NMOS tube (2-3) by the current value of OLED luminescence unit (3).
Constant current mirror driver module (2) and the current-mirror structure mode of each pixel driver branch road, flow through the electric current I of each pixel-driving circuit OLED luminescence unit (3) when making power management module (1) export positive pulse voltage
oledremain consistent, so each pixel light emission brightness uniformity can be ensured.
Flow through the electric current I of OLED luminescence unit (3)
oledcan basis
Calculate, the electric current flowing through each pixel driver branch road is only relevant with the way of the in-phase input end voltage of operational amplifier (2-1), the resistance of constant current resistance (2-4) and pixel driver branch road, with the individual character difference of TFT and OLED is aging and the threshold voltage shift that produces etc. are all irrelevant, the gray shade scale of oled panel display frame can change by changing the amplitude of power management module (1) output voltage.
As shown in Figure 2, power management module (1) provides positive negative pulse stuffing voltage to the anode of OLED luminescence unit (3) in the in-phase input end and all pixel driver branch roads of operational amplifier (2-1) simultaneously.When power management module (1) exports positive pulse power supply, constant current mirror driver module (2) provides driving constant current for OLED luminescence unit (3), and the electric current flowing through OLED luminescence unit (3) is constantly equal to the current value I by NMOS tube (2-3)
oled, make OLED luminescence unit (3) in all pixel driver branch roads send the light of same brightness; When power management module (1) exports negative pulse power supply, fast diode (2-2) is in reverse blocking state thus blocks the connection of constant current mirror driver module (2) and OLED luminescence unit (3), now the anode of OLED luminescence unit (3) is negative pulse voltage, and the negative electrode of OLED luminescence unit (3) is no-voltage over the ground.The pulse power that in the present embodiment, power management module (1) exports is positive negative pulse stuffing voltage, and the dutycycle of positive pulse voltage is 90%-95%, and the dutycycle of negative pulse voltage is 10%-5%.Below be only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also design some improvement, these improvement also should be considered as protection scope of the present invention.
Claims (9)
1. an oled panel driving circuit, comprise the first transistor, signal storage capacitors and transistor seconds, the grid of described the first transistor is electrically connected with sweep signal, second electrode of described the first transistor is electrically connected with data-signal, and the 3rd electrode of described the first transistor is electrically connected with the grid of signal storage capacitors and transistor seconds respectively; The other end ground connection of described signal storage capacitors; Second electrode of described transistor seconds is connected with the cathodic electricity of OLED luminescence unit (3), it is characterized in that, also comprises power management module (1) and constant current mirror driver module (2);
The output terminal of described power management module (1) is electrically connected with the anode of OLED luminescence unit (3) and the input end of constant current mirror driver module (2) respectively, and described power management module (1) is for providing the pulse power for OLED luminescence unit (3) and constant current mirror driver module (2) simultaneously;
The output terminal of described constant current mirror driver module (2) is electrically connected with the 3rd electrode of transistor seconds, and described constant current mirror driver module (2) is for providing driving constant current for OLED luminescence unit (3).
2. a kind of oled panel driving circuit according to claim 1, it is characterized in that, described constant current mirror driver module (2) comprises operational amplifier (2-1), fast diode (2-2), NMOS tube (2-3) and constant current resistance (2-4), the input end in the same way of described operational amplifier (2-1) is electrically connected with the output terminal of power management module (1), the drain electrode of described NMOS tube (2-3) is electrically connected with the 3rd electrode of transistor seconds, the grid of described NMOS tube (2-3) is electrically connected with the anode of fast diode (2-2), the negative electrode of described fast diode (2-2) is electrically connected with the output terminal of operational amplifier (2-1), the source electrode of described NMOS tube (2-3) is through constant current resistance (2-4) ground connection, one end that described constant current resistance (2-4) is connected with the source electrode of NMOS tube (2-3) is electrically connected with the reverse input end of operational amplifier (2-1).
3. a kind of oled panel driving circuit according to claim 2, it is characterized in that, described oled panel driving circuit comprises n pixel driver branch road, each described pixel driver branch road comprises described the first transistor, signal storage capacitors, transistor seconds and OLED luminescence unit (3), described constant current mirror driver module (2) comprises n NMOS tube (2-3), the drain electrode of each described NMOS tube (2-3) is electrically connected with the 3rd electrode of the transistor seconds of a pixel driver branch road respectively, the grid of each described NMOS tube (2-3) is connected, the source electrode of each described NMOS tube (2-3) is connected.
4. a kind of oled panel driving circuit according to claim 3, it is characterized in that, the output terminal of described power management module (1) is electrically connected with the second electrode of described transistor seconds, 3rd electrode of described transistor seconds is electrically connected with the anode of OLED luminescence unit (3), and the negative electrode of described OLED luminescence unit (3) is electrically connected with the drain electrode of NMOS tube (2-3).
5. a kind of oled panel driving circuit according to claim 4, it is characterized in that, the pulse power that described power management module (1) exports is positive negative pulse stuffing voltage, and the dutycycle of described positive pulse voltage is 90%-95%, and the dutycycle of described negative pulse voltage is 10%-5%.
6. a display device, is characterized in that, comprises the oled panel driving circuit according to any one of claim 1-5 item.
7. a driving method for oled panel driving circuit, is characterized in that, comprises the steps:
1) power management module (1) exports the pulse power respectively to the anode of OLED luminescence unit (3) and the input end of constant current mirror driver module (2);
2) data-signal (Vdata) and sweep signal (Scan) is sent to each pixel driver branch road.
8. the driving method of a kind of oled panel driving circuit according to claim 7, it is characterized in that, described step one also comprises, and makes to remain setting current value I by the electric current of NMOS tube (2-3) when power management module (1) exports positive pulse power supply
oled, its concrete steps comprise:
11) according to setting current value I
oLEDcalculate the driving current value of constant current mirror driver module (2), computing formula is: I=I
oled* n, wherein n equals the way of pixel driver branch road;
12) according to driving current value I computing driving voltage value V, computing formula is: V=I*R, and wherein R is the resistance of constant current resistance (2-4);
13) power management module (1) is to the in-phase input end input positive pulse voltage value V of operational amplifier (2-1).
9. the driving method of a kind of oled panel driving circuit according to claim 8, it is characterized in that, described step 2 specifically comprises:
21) charge to signal storage capacitors according to sweep signal (Scan) after the first transistor in every bar branch road receives data-signal (Vdata), data-signal (Vdata) is sent to transistor seconds by synchronous signal storage capacitors;
22) the OLED luminescence unit (3) in branch road is communicated with corresponding NMOS tube (2-3) according to data-signal (Vdata) by the transistor seconds in every bar branch road, then equal the current value by NMOS tube (2-3) by the current value of OLED luminescence unit (3), namely set current value I
oled.
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Address after: 430070 Hubei City, Hongshan Province, South Lake Road, No. 53, Hongshan Venture Center, building on the 4 floor, No. Applicant after: Wuhan fine test electronics group Limited by Share Ltd Applicant after: Wuhan University of Technology Address before: 430070 Hubei City, Hongshan Province, South Lake Road, No. 53, Hongshan Venture Center, building on the 4 floor, No. Applicant before: Wuhan Jingce Electronic Technology Co., Ltd. Applicant before: Wuhan University of Technology |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20150902 |