CN102982764A - Active matrix organic light-emitting diode display and driving method thereof - Google Patents
Active matrix organic light-emitting diode display and driving method thereof Download PDFInfo
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- CN102982764A CN102982764A CN2012105001321A CN201210500132A CN102982764A CN 102982764 A CN102982764 A CN 102982764A CN 2012105001321 A CN2012105001321 A CN 2012105001321A CN 201210500132 A CN201210500132 A CN 201210500132A CN 102982764 A CN102982764 A CN 102982764A
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Abstract
The invention provides an active matrix organic light-emitting diode display and a driving method thereof. The active matrix organic light-emitting diode display comprises an organic light-emitting diode (OLED) and a driving circuit, wherein the driving circuit comprises a first voltage, a second voltage, a first switch thin film transistor (TFT), a second driving TFT and a third driving TFT; the anode of the OLED is connected with a source electrode of the second driving TFT and a source electrode of the third driving TFT; and the cathode of the OLED is connected with the second voltage. According to the invention, alternating work of the second driving TFT and the third driving TFT is realized by inputting positive and negative symmetrical data signals; the OLED is driven to emit light; the problem of threshold voltage excursion caused by that directional current passes through the same driving TFT for a long time is solved; and the two driving TFTs are periodically alternately started, so that the work time of each TFT is halved, the service life of the TFTs is prolonged, the charge accumulation phenomenon is avoided, and residual image is avoided.
Description
Technical field
The present invention relates to display device and the driving method thereof of active matrix organic light-emitting diode.
Background technology
In the active matrix organic light-emitting diode (AMOLED), OLED (organic light emitting diode) describes is that the particular type-organic electric-excitation luminescent of film display technique shows the AM(active matrix) refer to address pixels technology behind.By 2011, the AMOLED technology was used on mobile phone and the media player, and continued towards low-power consumption low cost, large scale future development.The prior storage that the AMOLED demonstration is sent after being swashed by OLED matrix molecule electricity or the light that is integrated in TFT are controlled the current direction that flows to each pixel as a cover switch.The TFT backplane technology is to make the key of AMOLED display screen.Nowadays two main TFT backplane technology, namely polysilicon and amorphous silicon have been applied to AMOLED.The advantage of AMOLED is to have self-luminosity, wide viewing angle, high right.AMOLED compares passive type OLED and has higher refresh rate, and energy consumption also significantly reduces, and this makes AMOLED be fit to very much work in the portable electric appts to sensitive power consumption.
Owing to there are some ionizable impurity in the channel layer of TFT and the insulation course, so TFT works a period of time under the condition that continues the forward polarization, have the surface that the part charge carrier is captured on channel layer and insulation course, simultaneously also might have charge carrier and be captured on insulation course, although suitable quencher's artistic skill is improved the phenomenon that charge carrier is captured on insulation course, it is inevitably that but charge carrier is captured on the surface of channel layer and insulation course, thereby causes TFT threshold voltage after work a period of time to change.And the change of threshold voltage directly affects the accuracy of whole drives.Electric current can produce larger heat by TFT for a long time in addition, shortens the OLED life-span, and directed voltage is applied to and also can causes charge accumulated to produce image retention in addition.
Owing to there are some ionizable impurity in the channel layer of TFT and the insulation course, so TFT works a period of time under the condition that continues the forward polarization, have the surface that the part charge carrier is captured on channel layer and insulation course, simultaneously also might have charge carrier and be captured on insulation course, although suitable quencher's artistic skill is improved the phenomenon that charge carrier is captured on insulation course, it is inevitably that but charge carrier is captured on the surface of channel layer and insulation course, thereby causes TFT threshold voltage after work a period of time to change.And the change of threshold voltage directly affects the accuracy of whole drives.Electric current can produce larger heat by TFT for a long time in addition, shortens the OLED life-span, and directed voltage is applied to and also can causes charge accumulated to produce image retention in addition.
Summary of the invention
The present invention discloses a kind of active matrix organic light emitting diode display and driving method thereof, can not only solve the threshold voltage shift that directional current causes by same drive TFT for a long time, and can also open in turn by the periodicity of two drive TFT, so that the working time of each TFT reduces by half, prolong the serviceable life of TFT, avoid the phenomenon of charge accumulated, prevent the generation of image retention.
The invention provides a kind of active matrix organic light emitting diode display, comprising: an Organic Light Emitting Diode and one drive circuit, described driving circuit comprises:
The first voltage, this first voltage is power anode;
Second voltage, this second voltage are power cathode;
The first switching TFT comprises: a grid, drain electrode and an one source pole;
The second drive TFT comprises: a grid, drain electrode and an one source pole, and the grid of the second drive TFT connects the source electrode of the first switching TFT, and the drain electrode of the second drive TFT connects the first voltage;
The 3rd drive TFT, comprise: a grid, drain electrode and an one source pole, the grid of the 3rd drive TFT all with the source electrode of the first switching TFT be connected the grid of drive TFT and be connected, the drain electrode of the 3rd drive TFT receives the first voltage, wherein, the anode of described Organic Light Emitting Diode all is connected with the source electrode of the second drive TFT and the source electrode of the 3rd drive TFT, and the negative electrode of Organic Light Emitting Diode is connected with second voltage.
A kind of driving method of active matrix organic light emitting diode display, described the first voltage keeps constant positive voltage, second voltage keeps constant negative voltage, the grid voltage of the first switching TFT keeps the forward cut-in voltage, the drain electrode of the first switching TFT time period 1 to positive voltage, the drain electrode of the first switching TFT second round to negative voltage, replace successively.
When the last cycle, when the grid of the first switching TFT is high voltage, the first switching TFT is opened, the drain electrode of the first switching TFT is noble potential, the 3rd drive TFT is closed, and the positive voltage of the drain electrode of the first switching TFT imports to the grid of the second drive TFT via the source electrode of the first switching TFT, and the second drive TFT is opened, the driving voltage of the drain electrode of the first switching TFT imports the source electrode of the second drive TFT, and it is luminous that the source electrode of the second drive TFT and second voltage drive the flow driving organic light emitting diode;
When a rear cycle, when the grid of the first switching TFT is high voltage, the first switching TFT is opened, the drain electrode of the first switching TFT is electronegative potential, the second drive TFT is closed, and the negative voltage of the drain electrode of the first switching TFT imports to the grid of the 3rd drive TFT via the source electrode of the first switching TFT, and the 3rd drive TFT is opened, the driving voltage of the drain electrode of the 3rd drive TFT imports the source electrode of the 3rd drive TFT, and it is luminous that the source electrode of the 3rd drive TFT and second voltage drive the flow driving organic light emitting diode.
A kind of driving method of active matrix organic light emitting diode display, described the first voltage keeps constant positive voltage, second voltage keeps constant negative voltage, the grid voltage of the first switching TFT keeps the forward cut-in voltage, the drain electrode of the first switching TFT time period 1 to positive voltage, the drain electrode of the first switching TFT second round to negative voltage, replace successively.
When the last cycle, when the grid of the first switching TFT is high voltage, the first switching TFT is opened, the drain electrode of the first switching TFT is electronegative potential, the 3rd drive TFT is closed, and the negative voltage of the drain electrode of the first switching TFT imports to the grid of the second drive TFT via the source electrode of the first switching TFT, and the second drive TFT is opened, the driving voltage of the drain electrode of the first switching TFT imports the source electrode of the second drive TFT, and it is luminous that the source electrode of the second drive TFT and second voltage drive the flow driving organic light emitting diode;
When a rear cycle, when the grid of the first switching TFT is high voltage, the first switching TFT is opened, the drain electrode of the first switching TFT is noble potential, the second drive TFT is closed, and the positive voltage of the drain electrode of the first switching TFT imports to the grid of the 3rd drive TFT via the source electrode of the first switching TFT, and the 3rd drive TFT is opened, the driving voltage of the drain electrode of the 3rd drive TFT imports the source electrode of the 3rd drive TFT, and it is luminous that the source electrode of the 3rd drive TFT and second voltage drive the flow driving organic light emitting diode.
The present invention realizes the alternation of the second drive TFT and the 3rd drive TFT by the data-signal of input Symmetrical, driving OLED is luminous, can not only solve the threshold voltage shift that directional current causes by same drive TFT for a long time, and can also open in turn by the periodicity of two drive TFT, so that the working time of each TFT reduces by half, prolong the serviceable life of TFT, avoid the phenomenon of charge accumulated, prevent the generation of image retention.
Description of drawings
Fig. 1 is active matrix organic light-emitting diode driving circuit synoptic diagram of the present invention;
Fig. 2 is invention active matrix organic light-emitting diode driving circuit clock signal figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
The present invention discloses a kind of active matrix organic light emitting diode display, such as Fig. 1, it comprises: an Organic Light Emitting Diode OLED and an AC driving circuit, described AC driving circuit comprises: the first voltage Vdd, second voltage Vss, the first N-shaped switching TFT T1, second drive N-shaped TFT T2, the first memory capacitance C1, the 3rd and drive p-type channel TFT T3 and the second memory capacitance C2.
The first voltage Vdd is the voltage of power anode, and second voltage Vss is the voltage of power cathode.
The first N-shaped switching TFT T1 comprises: the source S 1 of the grid G 1 of the first switching TFT T1, the drain D 1 of the first switching TFT T1 and the first switching TFT T1, and G1 is used for receiving sweep signal, and D1 is used for reception of data signal.
Second drives N-shaped TFT T2 comprises: the source S 2 of the grid G 2 of the second drive TFT T2, the drain D 2 of the second drive TFT T2 and the second drive TFT T2; The 3rd drives p-type channel TFT T3 comprises: the source S 3 of the grid G 3 of the 3rd drive TFT T3, the drain D 3 of the 3rd drive TFT T3 and the 3rd drive TFT T3; Vdd is the first voltage, and this Vdd is the voltage of power anode, and Vss is second voltage, and this Vss is the voltage of power cathode.
Described the first switching TFT T1, the second drive TFT T2, the 3rd drive TFT T3 are amorphous silicon membrane transistor or polycrystalline SiTFT or oxide thin film transistor, or OTFT.
The first memory capacitance C1 has first end and the second end, and the first end of the first memory capacitance C1 is connected with the voltage Vdd of power anode, and the second end of the first memory capacitance C1 links to each other with the source S 1 of T1; The second memory capacitance C2 is used for the lasting driving of the 3rd drive TFT T3, and the second memory capacitance C2 also has first end and second segment, and the first end of C2 is connected with the drain D of T3 3, and the second end of C2 links to each other with the grid G 3 of T3.
Source S 1 one ends of T1 are connected with the grid G 2 of T2; Drain D 2 one ends of T2 are connected with the voltage Vdd of power anode; Source S 2 one ends of T2 and the anodic bonding of Organic Light Emitting Diode OLED, the negative electrode of Organic Light Emitting Diode OLED is connected with power cathode voltage Vss; One end of the source S 3 of T3 also with the anode of Organic Light Emitting Diode OLED.
In fact described the 3rd drive TFT T3 is equivalent to the second drive TFT T2 is relation in parallel.
The anode of described Organic Light Emitting Diode OLED all is connected with the output terminal of the second drive TFT T2 and the output terminal of the 3rd drive TFT T3, the negative electrode of Organic Light Emitting Diode OLED is connected with the voltage Vss of power cathode, that is: the anode of OLED all is connected source S 3 with the source S 2 of T2 and is connected with T3, thereby obtains drive current from T2 and T3.
Fig. 2 is the sequential chart of driving circuit of the present invention, power anode voltage Vdd keeps constant positive voltage, power cathode voltage Vss keeps constant negative voltage, grid G 1 voltage of the first switching TFT T1 keeps the forward cut-in voltage, the drain D 1 of the first switching TFT T1 at period 1 Frame1 to positive voltage, the drain D 1 of the first switching TFT T1 second round Frame2 to negative voltage, replace successively.
When G1 was noble potential, T1 closed, and the voltage of drain D 1 imports to the grid G 2 of T2 via source S 1, and C1 begins charging simultaneously, and T2 opens, and electric current I driving OLED (organic light emitting diode) is luminous.
When the G1 electronegative potential, memory capacitance C1 voltage driving OLED (organic light emitting diode) is luminous lasting luminous.In this process, electric current can make T2 produce larger heat for a long time, shortens the OLED life-span, and directed voltage is applied to and also can causes charge accumulated to produce image retention on the T2 in addition.
Drain D 1 receives positive and negative opposite data voltage at former and later two frame.
Think driving method of the present invention:
When last Frame, when G1 is high voltage, T1 opens, D1 is noble potential, and T3 closes, and the positive voltage of D1 imports to the grid G 2 of T2 via source S 1, C1 begins charging simultaneously, T2 opens, and the driving voltage of D2 imports S2, and it is luminous that S2 and Vss drive flow driving OLED (organic light emitting diode).
When a rear Frame, when G1 is high voltage, T1 opens, D1 is electronegative potential, and T2 closes, and the negative voltage of D1 imports to the grid G 3 of T3 via source S 1, C2 begins charging simultaneously, T3 opens, and the driving voltage of D3 imports S3, and it is luminous that S3 and Vss drive flow driving OLED (organic light emitting diode).
Luminous by two driving switch T2 and T3 driven OLED (organic light emitting diode) with this.
The second embodiment:
Described the second drive TFT T2 is the p-type channel thin-film transistor, described the 3rd drive TFT T3 is the N-shaped thin film transistor (TFT), when last Frame, when G1 is high voltage, T1 opens, D1 is end current potential, and T3 closes, and the negative voltage of D1 imports to the grid G 2 of T2 via source S 1, C1 begins charging simultaneously, T2 opens, and the driving voltage of D2 imports S2, and it is luminous that S2 and Vss drive flow driving OLED (organic light emitting diode).
Think driving method of the present invention:
When a rear Frame, when G1 is high voltage, T1 opens, D1 is noble potential, and T2 closes, and the positive voltage of D1 imports to the grid G 3 of T3 via source S 1, C2 begins charging simultaneously, T3 opens, and the driving voltage of D3 imports S3, and it is luminous that S3 and Vss drive flow driving OLED (organic light emitting diode).
Luminous by two driving switch T2 and T3 driven OLED (organic light emitting diode) with this.
The present invention realizes the alternation of the second drive TFT and the 3rd drive TFT by the data-signal of input Symmetrical, driving OLED is luminous, can not only solve the threshold voltage shift that directional current causes by same drive TFT for a long time, and can also open in turn by the periodicity of two drive TFT, so that the working time of each TFT reduces by half, prolong the serviceable life of TFT, avoid the phenomenon of charge accumulated, prevent the generation of image retention.
Claims (9)
1. active matrix organic light emitting diode display, comprising: an Organic Light Emitting Diode and one drive circuit is characterized in that: described driving circuit comprises:
The first voltage, this first voltage is power anode;
Second voltage, this second voltage are power cathode;
The first switching TFT comprises: a grid, drain electrode and an one source pole;
The second drive TFT comprises: a grid, drain electrode and an one source pole, and the grid of the second drive TFT connects the source electrode of the first switching TFT, and the drain electrode of the second drive TFT connects the first voltage;
The 3rd drive TFT, comprise: a grid, drain electrode and an one source pole, the grid of the 3rd drive TFT all with the source electrode of the first switching TFT be connected the grid of drive TFT and be connected, the drain electrode of the 3rd drive TFT receives the first voltage, wherein, the anode of described Organic Light Emitting Diode all is connected with the source electrode of the second drive TFT and the source electrode of the 3rd drive TFT, and the negative electrode of Organic Light Emitting Diode is connected with second voltage.
2. a kind of active matrix organic light emitting diode display according to claim 1, it is characterized in that: described the first switching TFT is the N-shaped thin film transistor (TFT), the second drive TFT is the N-shaped channel thin-film transistor, and the 3rd drive TFT is the p-type channel thin-film transistor.
3. a kind of active matrix organic light emitting diode display according to claim 1, it is characterized in that: described the first switching TFT is the N-shaped thin film transistor (TFT), and the second drive TFT is the p-type raceway groove, and the 3rd drive TFT is the N-shaped channel thin-film transistor.
4. a kind of active matrix organic light emitting diode display according to claim 1 is characterized in that: described the second drive TFT and the 3rd drive TFT are relation in parallel.
5. a kind of active matrix organic light emitting diode display according to claim 1, it is characterized in that: also comprise the first memory capacitance, it has first end and the second end, the first end of this first memory capacitance all with the source electrode of the first switching TFT be connected the grid of drive TFT and be connected, the second end of this first memory capacitance all with the first voltage be connected the drain electrode of drive TFT and be connected.
6. a kind of active matrix organic light emitting diode display according to claim 1, it is characterized in that: also comprise the second memory capacitance, it has first end and the second end, the first end of this second memory capacitance is connected with the grid of the 3rd switching TFT, the second end of this first memory capacitance all with the first voltage be connected the drain electrode of drive TFT and be connected.
7. a kind of active matrix organic light emitting diode display according to claim 1, it is characterized in that: described TFT is amorphous silicon membrane transistor or polycrystalline SiTFT or oxide thin film transistor, or OTFT.
8. the driving method of a kind of active matrix organic light emitting diode display according to claim 1, it is characterized in that: described the first voltage keeps constant positive voltage, second voltage keeps constant negative voltage, the grid voltage of the first switching TFT keeps the forward cut-in voltage, the drain electrode of the first switching TFT time period 1 to positive voltage, the drain electrode of the first switching TFT second round to negative voltage, replace successively.
When the last cycle, when the grid of the first switching TFT is high voltage, the first switching TFT is opened, the drain electrode of the first switching TFT is noble potential, the 3rd drive TFT is closed, and the positive voltage of the drain electrode of the first switching TFT imports to the grid of the second drive TFT via the source electrode of the first switching TFT, and the second drive TFT is opened, the driving voltage of the drain electrode of the first switching TFT imports the source electrode of the second drive TFT, and it is luminous that the source electrode of the second drive TFT and second voltage drive the flow driving organic light emitting diode;
When a rear cycle, when the grid of the first switching TFT is high voltage, the first switching TFT is opened, the drain electrode of the first switching TFT is electronegative potential, the second drive TFT is closed, and the negative voltage of the drain electrode of the first switching TFT imports to the grid of the 3rd drive TFT via the source electrode of the first switching TFT, and the 3rd drive TFT is opened, the driving voltage of the drain electrode of the 3rd drive TFT imports the source electrode of the 3rd drive TFT, and it is luminous that the source electrode of the 3rd drive TFT and second voltage drive the flow driving organic light emitting diode.
9. the driving method of a kind of active matrix organic light emitting diode display according to claim 1, it is characterized in that: described the first voltage keeps constant positive voltage, second voltage keeps constant negative voltage, the grid voltage of the first switching TFT keeps the forward cut-in voltage, the drain electrode of the first switching TFT time period 1 to positive voltage, the drain electrode of the first switching TFT second round to negative voltage, replace successively.
When the last cycle, when the grid of the first switching TFT is high voltage, the first switching TFT is opened, the drain electrode of the first switching TFT is electronegative potential, the 3rd drive TFT is closed, and the negative voltage of the drain electrode of the first switching TFT imports to the grid of the second drive TFT via the source electrode of the first switching TFT, and the second drive TFT is opened, the driving voltage of the drain electrode of the first switching TFT imports the source electrode of the second drive TFT, and it is luminous that the source electrode of the second drive TFT and second voltage drive the flow driving organic light emitting diode;
When a rear cycle, when the grid of the first switching TFT is high voltage, the first switching TFT is opened, the drain electrode of the first switching TFT is noble potential, the second drive TFT is closed, and the positive voltage of the drain electrode of the first switching TFT imports to the grid of the 3rd drive TFT via the source electrode of the first switching TFT, and the 3rd drive TFT is opened, the driving voltage of the drain electrode of the 3rd drive TFT imports the source electrode of the 3rd drive TFT, and it is luminous that the source electrode of the 3rd drive TFT and second voltage drive the flow driving organic light emitting diode.
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| CN103646629A (en) * | 2013-12-18 | 2014-03-19 | 信利半导体有限公司 | Pixel drive device of AMOLED (Active Matrix Organic Light Emitting Display) |
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Application publication date: 20130320 |