CN103927976A - Organic light-emitting diode pixel drive circuit and organic light-emitting diode display - Google Patents
Organic light-emitting diode pixel drive circuit and organic light-emitting diode display Download PDFInfo
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- CN103927976A CN103927976A CN201310752924.2A CN201310752924A CN103927976A CN 103927976 A CN103927976 A CN 103927976A CN 201310752924 A CN201310752924 A CN 201310752924A CN 103927976 A CN103927976 A CN 103927976A
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Abstract
The invention discloses an organic light-emitting diode pixel drive circuit which comprises a first transistor, a first capacitor, a second capacitor, a second transistor, a third transistor and a drive transistor, wherein a grid electrode of the first transistor receives a scan signal, a first electrode of the first transistor is connected with a data signal line, and a second electrode of the first transistor is connected with a first polar plate of the first capacitor, a first polar plate of the second capacitor and a grid electrode of the drive transistor; a grid electrode of the second transistor receives a light-emitting control signal, a first electrode of the second transistor is connected with a second electrode of the drive transistor, a second polar plate of the second capacitor and a second electrode of the third transistor, and a second electrode of the second transistor is connected with a positive electrode of an organic light-emitting diode; a grid electrode of the third transistor receives an initialization signal, a second electrode of the third transistor is connected with the second electrode of the drive transistor, the first electrode of the second transistor and the second polar plate of the second capacitor, and a first electrode of the third transistor receives reference voltage; a first electrode of the drive transistor is connected with a first power supply; a negative electrode of the organic light-emitting diode is connected with a second power supply and is connected with the second polar plate of the first capacitor. By means of the organic light-emitting diode pixel drive circuit, source voltage of a driving tube can be stabilized, and the brightness of an OLED screen can be improved.
Description
Technical field
The present invention relates to display technology field, relate in particular to organic light emitting diode pixel-driving circuit and organic light emitting diode display.
Background technology
OLED indicator screen visible angle is large, and remarkable saves energy, and therefore OLED display obtains applying more and more widely.
OLED(Organic Light Emitting Diode (Organic Light-Emitting Diode) is made up of ultra-thin coating of organic material and glass substrate, and in the time having electric current to pass through OLED, coating of organic material wherein will be luminous, thereby make OLED indicator screen luminous.
Summary of the invention
On the one hand, the embodiment of the present invention provides a kind of organic light emitting diode pixel-driving circuit, for driving described Organic Light Emitting Diode, comprising: the first electric capacity, the second electric capacity, the first transistor, transistor seconds, the 3rd transistor and driving transistors;
The grid of described the first transistor receives sweep signal, the first electrode connection data signal wire, and the second electrode connects the first pole plate of the first pole plate of described the first electric capacity, described the second electric capacity and the grid of described driving transistors;
The grid of described transistor seconds receives LED control signal, the first electrode connects the second pole plate and described the 3rd transistorized second electrode of the second electrode of described driving transistors, described the second electric capacity, and the second electrode connects the positive pole of described Organic Light Emitting Diode;
Described the 3rd transistorized grid receives initializing signal, and the second electrode connects the first electrode of the second electrode of described driving transistors, described transistor seconds and the second pole plate of described the second electric capacity, and the first electrode receives reference voltage;
The first electrode of described driving transistors connects the first power supply;
The negative pole of described Organic Light Emitting Diode connects second source, and connects the second pole plate of described the first electric capacity;
Wherein, described the first supply voltage is greater than described second source voltage.
On the other hand, the embodiment of the present invention also provides a kind of organic light emitting diode display, comprises sweep trace, data line and Organic Light Emitting Diode, also comprises above-mentioned organic light emitting diode pixel-driving circuit.
A kind of organic light emitting diode pixel-driving circuit and organic light emitting diode display that the embodiment of the present invention provides, have following beneficial effect:
Can compensate OLED impedance, Simultaneous Stabilization driving tube source voltage, the brightness that improves Organic Light Emitting Diode screen.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
A kind of organic light emitting diode pixel-driving circuit figure that Fig. 1 provides for the invention process;
Fig. 2 is a kind of organic light emitting diode pixel-driving circuit signal schematic representation;
The initial phase organic light emitting diode pixel-driving circuit figure that Fig. 3 provides for the invention process;
The input phase organic light emitting diode pixel-driving circuit figure that Fig. 4 provides for the invention process;
The glow phase organic light emitting diode pixel-driving circuit figure that Fig. 5 provides for the invention process.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
At present, due under the effect of aging effect, OLED direct impedance increases, and luminous power declines, and causes the brightness of OLED display to reduce.
In view of this, the embodiment of the present invention provides a kind of organic light emitting diode pixel-driving circuit and organic light emitting diode display, increase to solve OLED direct impedance, luminous power declines, cause the brightness of OLED display to reduce, and signal when input, the technical matters of driving tube source class voltage instability.
Fig. 1 illustrates a kind of organic light emitting diode pixel-driving circuit figure.
The embodiment of the invention discloses a kind of organic light emitting diode pixel-driving circuit, for driving Organic Light Emitting Diode D1, increase to overcome hesitation OLED direct impedance, luminous power declines, the technical matters that causes the brightness of OLED display to reduce.This circuit comprises: the first capacitor C 1, the second capacitor C 2, the first transistor M1, transistor seconds M2, the 3rd transistor M3 and driving transistors M0;
The grid of the first transistor M1 receives sweep signal Scan, the first electrode connection data signal wire Data, and the second electrode connects the first pole plate, the first pole plate of the second capacitor C 2 and the grid of driving transistors M0 of the first capacitor C 1;
The grid of transistor seconds M2 receives LED control signal Emit, and the first electrode connects the second electrode, the second pole plate of the second capacitor C 2 and the second electrode of the 3rd transistor M3 of driving transistors M0, and the second electrode is connected with the positive pole of OLED D1;
The grid of the 3rd transistor M3 receives initializing signal Init, and the second electrode connects the second electrode, the first electrode of transistor seconds M2 and the second pole plate of the second capacitor C 2 of driving transistors M0, and the first electrode receives reference voltage VRef;
The first electrode of driving transistors M0 connects the first power supply PVDD;
The negative pole of Organic Light Emitting Diode D1 connects second source PVEE, and connects the second pole plate of the first capacitor C 1; Wherein, the first power supply PVDD voltage is greater than second source PVEE voltage.
Need to describe, each transistor comprises: grid, source electrode and drain electrode.Above-mentioned the first electrode is drain electrode, and the second electrode is source electrode.
The first transistor M1, transistor seconds M2, the 3rd transistor M3 and driving transistors M0 are N-type TFT(Thin Film Transistor, Thin Film Transistor (TFT)).
Drive the disclosed a kind of organic light emitting diode pixel-driving circuit of the embodiment of the present invention to comprise following three sequential stages: initial phase, input phase and glow phase.Fig. 2 is a kind of organic light emitting diode pixel-driving circuit signal schematic representation, and as shown in Figure 2, at initial phase 21, sweep signal Scan is low level, and initializing signal Init is high level, and LED control signal Emit is low level; At input phase 22, sweep signal Scan is high level, and initializing signal Init is high level, and LED control signal Emit is low level; In glow phase 23, sweep signal Scan is low level, and initializing signal Init is low level, and LED control signal Emit is high level.
At initial phase 21, concrete, please refer to Fig. 2, Fig. 3, wherein, Fig. 3 is initial phase organic light emitting diode pixel-driving circuit figure.
At initial phase 21, sweep signal Scan is low level, and initializing signal Init is high level, and LED control signal Emit is low level.
As shown in Figure 3, the grid of driving transistors M0 connects the first pole plate of the first capacitor C 1 and the first pole plate of the second capacitor C 2, and the first electrode connects the first power supply PVDD, and the second electrode connects the second electrode of the 3rd transistor M3;
The grid of the 3rd transistor M3 receives initializing signal Init, and the second electrode connects the second electrode of driving transistors M0 and the second pole plate of the second capacitor C 2, and the first electrode receives reference voltage VRef.
At input phase 22, concrete, please refer to Fig. 2, Fig. 4, wherein, Fig. 4 is input phase organic light emitting diode pixel-driving circuit figure.
At input phase, sweep signal Scan is high level, and initializing signal Init is high level, and LED control signal Emit is low level.
As shown in Figure 4, the grid of the first transistor M1 receives sweep signal Scan, the first electrode connection data signal wire Data, and the second electrode connects the first pole plate, the first pole plate of the second capacitor C 2 and the grid of driving transistors M0 of the first capacitor C 1;
The grid of the 3rd transistor M3 receives initializing signal Init, and the first electrode receives reference voltage VRef, and the second electrode connects the second electrode of driving transistors M0 and the second pole plate of the second capacitor C 2;
The first electrode of driving transistors M0 receives the first power supply PVDD signal;
The second pole plate of the first capacitor C 1 receives second source PVEE signal.
In glow phase 23, concrete, please refer to Fig. 2, Fig. 4, wherein, Fig. 5 is glow phase organic light emitting diode pixel-driving circuit figure.
In glow phase, sweep signal Scan is low level, and initializing signal Init is low level, and LED control signal Emit is high level.
As shown in Figure 5, in glow phase, the grid of transistor seconds M3 receives LED control signal Emit, the positive pole of the second electrode connecting luminous diode, and the first electrode connects the second pole plate of the second capacitor C 2 and the second electrode of driving transistors M0;
The grid of driving transistors M0 connects the first electrode of the first capacitor C 1, and the first electrode receives the first power supply PVDD signal;
The negative pole of light emitting diode receives second source PVEE signal, and connects the second pole plate of the first capacitor C 1.
In the prior art, when organic light emitting diode is aging, when impedance increases, driving transistors source voltage increases thereupon, causes driving tube source-drain current unstable, affects the brightness of OLED screen.
By the disclosed a kind of organic light emitting diode pixel-driving circuit of the embodiment of the present invention, when organic light emitting diode aging, when impedance increases, when driving transistors source voltage increases thereupon, by the time that signal is inputted, introduce a fixing reference voltage at source electrode, make the source voltage of driving transistors and the difference of grid voltage maintain steady state (SS), make the brightness stability of OLED screen, and signal when input, driving tube source class voltage stabilization.
The embodiment of the invention also discloses a kind of organic light emitting diode display, comprise sweep trace, data line and light emitting diode, also comprise above-mentioned organic light emitting diode pixel-driving circuit.
Obviously, it will be understood by those skilled in the art that under a stable condition, source electrode can exchange with drain electrode, and in the present embodiment, described the first electrode is drain electrode, described the second electrode is source electrode, can be also source electrode for described the first electrode, and described the second electrode is drain electrode.
These are only the preferred embodiments of the present invention, be not limited to the present invention, to those skilled in the art, the present invention can have various changes and variation.All any amendments of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included within spirit of the present invention and principle.
Claims (8)
1. an organic light emitting diode pixel-driving circuit, for driving described Organic Light Emitting Diode, is characterized in that, comprising: the first electric capacity, the second electric capacity, the first transistor, transistor seconds, the 3rd transistor and driving transistors;
The grid of described the first transistor receives sweep signal, the first electrode connection data signal wire, and the second electrode connects the first pole plate of the first pole plate of described the first electric capacity, described the second electric capacity and the grid of described driving transistors;
The grid of described transistor seconds receives LED control signal, the first electrode connects the second pole plate and described the 3rd transistorized second electrode of the second electrode of described driving transistors, described the second electric capacity, and the second electrode connects the positive pole of described Organic Light Emitting Diode;
Described the 3rd transistorized grid receives initializing signal, and the second electrode connects the first electrode of the second electrode of described driving transistors, described transistor seconds and the second pole plate of described the second electric capacity, and the first electrode receives reference voltage;
The first electrode of described driving transistors connects the first power supply;
The negative pole of described Organic Light Emitting Diode connects second source, and connects the second pole plate of described the first electric capacity;
Wherein, described the first supply voltage is greater than described second source voltage.
2. organic light emitting diode pixel-driving circuit according to claim 1, is characterized in that, described the first electrode is drain electrode, and described the second electrode is source electrode.
3. organic light emitting diode pixel-driving circuit according to claim 2, is characterized in that, described the first transistor, described transistor seconds, described the 3rd transistor and described driving transistors are N-type TFT.
4. organic light emitting diode pixel-driving circuit according to claim 3, is characterized in that, the driving sequential of described organic light emitting diode pixel-driving circuit comprises initial phase, input phase and glow phase.
5. according to the organic light emitting diode pixel-driving circuit of claim 4, it is characterized in that, at described initial phase, described sweep signal is low level, and described initializing signal is high level, and described LED control signal is low level;
The grid of described driving transistors connects the first pole plate of described the first electric capacity and the first pole plate of described the second electric capacity, and the first electrode connects the first power supply, and the second electrode connects described the 3rd transistorized the second electrode;
Described the 3rd transistorized grid receives described initializing signal, and the first electrode connects the source electrode of described driving transistors and the second pole plate of described the second electric capacity.
6. according to the organic light emitting diode pixel-driving circuit of claim 4, it is characterized in that, at described input phase, described sweep signal is high level, and described initializing signal is high level, and described LED control signal is low level;
The grid of described the first transistor receives described sweep signal, the first electrode connection data signal wire, and the second electrode connects the first pole plate of the first pole plate of described the first electric capacity, described the second electric capacity and the grid of described driving transistors;
Described the 3rd transistorized grid receives described initializing signal, and the first electrode receives described reset signal, and the second electrode connects the second electrode of described driving transistors and the second pole plate of described the second electric capacity;
The first electrode of described driving transistors connects described the first power supply;
The second pole plate of described the first electric capacity connects second source.
7. according to the organic light emitting diode pixel-driving circuit of claim 4, it is characterized in that, in described glow phase, described sweep signal is low level, and described initializing signal is low level, and described LED control signal is high level;
Described the 3rd transistorized grid receives described LED control signal, and the first electrode connects the positive pole of described light emitting diode, and the second electrode connects the second pole plate of described the second electric capacity and the second electrode of described driving transistors;
The grid of described driving transistors connects the first electrode of described the first electric capacity, and the first electrode receives described the first power supply signal;
The negative pole of described light emitting diode receives second source signal, and connects the second pole plate of described the first electric capacity.
8. an organic light emitting diode display, is characterized in that, comprises sweep trace, data line and Organic Light Emitting Diode, also comprises the organic light emitting diode pixel-driving circuit as described in claim 1-7 any one.
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| CN201310752924.2A CN103927976B (en) | 2013-12-31 | 2013-12-31 | Organic light emitting diode pixel-driving circuit and organic light emitting diode display |
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| CN201310752924.2A CN103927976B (en) | 2013-12-31 | 2013-12-31 | Organic light emitting diode pixel-driving circuit and organic light emitting diode display |
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Cited By (4)
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| CN111383600A (en) * | 2020-04-28 | 2020-07-07 | 厦门天马微电子有限公司 | Pixel driving circuit, driving method, display panel and display device |
| WO2020220613A1 (en) * | 2019-04-29 | 2020-11-05 | 云谷（固安）科技有限公司 | Pixel drive circuit and drive method therefor |
| CN112309319A (en) * | 2020-11-05 | 2021-02-02 | 重庆惠科金渝光电科技有限公司 | Display panel drive circuit and display device |
| CN113611247A (en) * | 2021-08-04 | 2021-11-05 | 京东方科技集团股份有限公司 | Display substrate and display panel |
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| CN102842277A (en) * | 2011-06-22 | 2012-12-26 | 奇美电子股份有限公司 | Displaying device with compensation function |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020220613A1 (en) * | 2019-04-29 | 2020-11-05 | 云谷（固安）科技有限公司 | Pixel drive circuit and drive method therefor |
| CN111383600A (en) * | 2020-04-28 | 2020-07-07 | 厦门天马微电子有限公司 | Pixel driving circuit, driving method, display panel and display device |
| US11302246B2 (en) | 2020-04-28 | 2022-04-12 | Xiamen Tianma Micro-Electronics Co., Ltd. | Pixel driving circuit and driving method thereof, display panel and display device |
| CN111383600B (en) * | 2020-04-28 | 2022-04-19 | 厦门天马微电子有限公司 | Pixel driving circuit, driving method, display panel and display device |
| CN112309319A (en) * | 2020-11-05 | 2021-02-02 | 重庆惠科金渝光电科技有限公司 | Display panel drive circuit and display device |
| CN113611247A (en) * | 2021-08-04 | 2021-11-05 | 京东方科技集团股份有限公司 | Display substrate and display panel |
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| CN103927976B (en) | 2017-01-04 |
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