CN104517565B - Image element circuit, driving method and its display device of OLED - Google Patents
Image element circuit, driving method and its display device of OLED Download PDFInfo
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Abstract
The invention discloses a kind of image element circuit of OLED, driving method and its display device, the image element circuit includes horizontal time-base line Scan and vertical data signal wire Vdata, also include vertical control signal line CL, controlling transistor T3, and the packed-pixel unit being connected with power signal line Vdd；Wherein, the vertical control signal line CL is electrical connected with the packed-pixel unit；The grid of the horizontal time-base line Scan connections controlling transistor T3, the first electrode of the controlling transistor T3 is connected with the vertical data signal wire Vdata, and the second electrode of the controlling transistor T3 is then connected with the packed-pixel unit., can be when flat panel display size increase and resolution ratio be improved, it is ensured that switching transistor can be such that image element circuit is stably switched on, and solve the bad defect of display using the present invention.
Description
Technical Field
The present invention relates to a flat panel display technology, and more particularly, to an organic light emitting pixel circuit, a driving method, and a display device thereof that improve the turn-on and turn-off speeds of a switching transistor in a large-sized or high-resolution display panel.
Background
The organic light emitting display is a new type of flat panel display, and has significant advantages of low power consumption, fast response speed, and the like. The principle is that the recombination of electrons and holes in an organic light emitting diode is used for generating light to realize image display.
Generally, an organic light emitting display includes a scan line in a horizontal direction and a data line in a vertical direction, and an intersection region of the scan line and the data line defines a pixel. As shown in fig. 1, the conventional organic light emitting display 2T1C includes an Organic Light Emitting Diode (OLED), a horizontal Scan signal (line) Scan, a vertical data signal (line) Vdata, a power signal (line) Vdd, a first thin film transistor T1, a second thin film transistor T2, and a storage capacitor C.
The first thin film transistor T1 is a switching transistor, and has a gate connected to a horizontal scanning signal (line) Scan, a first electrode connected to a vertical data signal (line) Vdata, and a second electrode connected to the gate of the driving thin film transistor T2 and one end of the storage capacitor C. When the horizontal Scan signal Scan is supplied to the first thin film transistor T1, the first thin film transistor is turned on, and the vertical data signal Vdata is supplied to the storage capacitor C and the gate electrode of the second thin film transistor T2, i.e., a voltage corresponding to the data signal is charged into the capacitor C.
The second thin film transistor T2 is a driving transistor, and has a gate connected to the second electrode of the first thin film transistor and one end of the storage capacitor C, a first electrode connected to the power signal (line) Vdd and the other end of the storage capacitor C, and a second electrode connected to the anode of the organic light emitting diode. The second thin film transistor controls a current flowing from the power supply signal Vdd to the organic light emitting diode corresponding to the voltage stored in the capacitor C, so that the organic light emitting diode OLED can display a predetermined luminance.
One end of the storage capacitor C is connected to the gate of the second thin film transistor T2, and the other end is connected to a power supply signal (line) Vdd. The storage capacitor C is used to store a voltage corresponding to a data signal.
However, the pixel circuit has a problem that the delay of the Scan signal Scan increases with the increase of the area of the display panel and the corresponding increase of the horizontal signal line, and finally the switching speed of the thin film transistor decreases, thereby causing a display failure.
Disclosure of Invention
In view of the above, the present invention is directed to a pixel circuit of an organic light emitting display, a driving method thereof, and a display device thereof, which can ensure that a switching transistor can stably turn on (turn on) and turn off (turn off) the pixel circuit to solve the defect of poor display when the size of a flat panel display is increased and the resolution is improved.
Another object of the present invention is to provide a display device using the pixel circuit, wherein two rows of pixels share one horizontal scan line, so that the number of horizontal scan lines can be reduced by half, the problems of reduction of turn-on and turn-off speeds of the switching transistor can be further improved, and the display performance of the display panel can be improved.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a pixel circuit of an organic light emitting display, comprising: a horizontal scanning signal line Scan and a vertical data signal line Vdata, and further includes a vertical control signal line CL, a control transistor T3, and a combined pixel unit connected to a power supply signal line Vdd; wherein,
the vertical control signal line CL is electrically connected with the combined pixel unit;
the horizontal scanning signal line Scan is connected to the gate of the control transistor T3, the first electrode of the control transistor T3 is connected to the vertical data signal line Vdata, and the second electrode of the control transistor T3 is connected to the combined pixel unit.
Wherein the combined pixel unit includes a first pixel and a second pixel;
the first pixel includes a first switching transistor T11, a first driving transistor T12, a first storage capacitor C1, and a first light emitting diode; and the second pixel includes a second switching transistor T21, a second driving transistor T22, a second storage capacitor C2, and a second light emitting diode.
The gates of the first switching transistor T11 and the second switching transistor T21 are connected with a vertical control signal line CL, and the first electrodes of the first switching transistor T11 and the second switching transistor T21 are connected with the second electrode of the control transistor T3 in parallel; second electrodes of the first and second switching transistors T11 and T21 are connected to gates of the first and second driving transistors T12 and T22, respectively.
One of the first switch transistor T11 and the second switch transistor T21 is an N-type transistor, and the other is a P-type transistor.
A driving method of an organic light emitting display pixel circuit includes:
A. supplying a high level to the horizontal scanning signal line Scan to turn on the control transistor T3; and transmits the vertical data signal Vdata to the first and second pixels in the combined pixel unit through the first and second switching transistors T11 and T21, respectively;
B. supplying a high level to the vertical control signal line CL to turn on the first switching transistor T11 of the first pixel, and at this time, turning off the second switching transistor T21 of the second pixel;
C. the vertical control signal line CL is supplied with a low level to turn on the second switching transistor T21 of the second pixel, and at this time, the first switching transistor T11 of the first pixel is turned off.
When the first switching transistor T11 of the first pixel is turned on in step B, the vertical data signal Vdata corresponding to the first data voltage D1 is transmitted to the gate of the first driving transistor T12 of the first pixel through the first switching transistor T11, and the first storage capacitor C1 of the first pixel is charged with a voltage value corresponding to the first data voltage D1.
When the second switching transistor T21 of the second pixel is turned on in step C, the second data voltage D2 corresponding to the vertical data signal line Vdata is transmitted to the gate of the second driving transistor T22 of the second pixel through the second switching transistor T21, and the second storage capacitor C2 of the second pixel is charged with the voltage value corresponding to the second data voltage D2.
Step C also comprises the following steps: the horizontal Scan signal Scan is maintained in a high state, and the control transistor T3 is maintained in a turned-on state.
A display device of an organic light emitting display including the pixel circuit of claim 1, comprising:
horizontal scanning lines forming a crossing region with the vertical data lines;
a first pixel located in the crossing region and on an m-th horizontal line;
a second pixel located in the crossing region and on an m +1 th horizontal line;
a vertical control signal line electrically connected to the first pixel and the second pixel; and
and the control transistor is used for simultaneously transmitting the horizontal scanning signal to the first pixel and the second pixel.
Wherein, every two adjacent horizontal lines share one horizontal scanning line.
The pixel circuit, the driving method and the display device of the organic light emitting display provided by the invention have the following advantages:
1) the pixel circuit of the invention is applied to a large-size or high-resolution display panel, can ensure that the switching transistor is stably switched on and off, and can reduce the number of horizontal scanning lines by half.
2) The display device of the invention can control the first pixel and the second pixel of two adjacent rows by only adopting one vertical control line CL, and has shorter length than the horizontal scanning line Scan in a large-size or high-resolution display panel, so the vertical control line CL has smaller signal delay, and the switching transistor in the pixel circuit can be stably switched on and off. In addition, only one scanning line is adopted to correspond to the first pixel and the second pixel of two adjacent rows, so that the number of horizontal scanning lines is reduced by half. For a large-sized or high-resolution display panel, the delay of the scanning signal in this case will be improved, i.e., the switching transistor in the pixel circuit can be turned on and off stably.
Drawings
FIG. 1 is a schematic diagram of a conventional 2T1C pixel circuit;
FIG. 2 is a schematic diagram of a pixel circuit according to an embodiment of the invention;
fig. 3 is a driving waveform diagram according to an embodiment of the invention.
Detailed Description
The organic light emitting pixel circuit, the driving method and the display device according to the present invention will be described in further detail with reference to the accompanying drawings and embodiments of the present invention.
Fig. 2 is a schematic diagram of a pixel circuit according to an embodiment of the invention. As shown in fig. 2, the pixel circuit mainly includes: a horizontal scanning signal (line) Scan, a vertical data signal (line) Vdata, a vertical control signal (line) CL, a control transistor T3, a power supply signal (line) Vdd, and a connected combined pixel cell. The combined pixel unit includes a first pixel and a second pixel. Wherein,
the first pixel mainly includes: a first switching transistor T11, a first driving transistor T12, a first storage capacitor C1, and a first light emitting diode.
The second pixel mainly includes: a second switching transistor T21, a second driving transistor T22, a second storage capacitor C2, and a second light emitting diode.
The light emitting diodes in the first and second pixels generate light of a predetermined brightness by the currents supplied from the first and second driving transistors T12 and T22, respectively.
The gates of the first and second switching transistors T11 and T21 are both connected to a vertical control signal (line) CL, their first electrodes are both connected to the second electrode of the control transistor T3, and their second electrodes are connected to the gates of the first and second driving transistors T12 and T22, respectively.
In particular, the first and second switching transistors T11 and T21 are different types of transistors. The method comprises the following specific steps: the first switch transistor T11 is an N-type transistor, and the second switch transistor T21 is a P-type transistor, or vice versa. When a signal is supplied to the vertical control signal line CL, the first switching transistor T11 of the first pixel and the second switching transistor T21 of the second pixel are turned on (turned on) in time-staggered fashion.
The first driving transistor T12 and the second driving transistor T22 are respectively connected between a power supply signal (line) Vdd of the first pixel and the organic light emitting diode, and between a power supply signal (line) Vdd of the second pixel and the organic light emitting diode. The first and second driving transistors T12 and T22 control the amounts of current flowing through the organic light emitting diodes of the first and second pixels, respectively.
The first and second storage capacitors C1 and C2 are connected between the gates of the driving transistors of the first and second pixels and the power supply signal Vdd, respectively. And a first storage capacitor C1 and a second storage capacitor C2 for storing a voltage corresponding to the vertical data signal Vdata.
The control transistor T3 has a gate connected to a horizontal scanning signal (line) Scan, a first electrode connected to a vertical data signal (line) Vdata, and second electrodes connected to first electrodes of a first switching transistor T11 in the first pixel and a second switching transistor T21 in the second pixel, respectively. When the signal Scan is supplied to the horizontal Scan line, the control transistor T3 is turned on, transmitting the vertical data signal Vdata into the first and second pixels.
Fig. 3 is a driving waveform diagram corresponding to the pixel circuit of fig. 2. As shown in fig. 3, the driving process of the pixel circuit includes:
step 31: the Scan signal is supplied to the horizontal Scan line, and a high level turns on the control transistor T3. At this time, the vertical data signal Vdata is transferred into the first and second pixels through the first and second switching transistors T11 and T21, respectively.
Step 32: a high level signal is supplied to the vertical control signal line CL to turn on the first switching transistor T11 of the first pixel. When the first switching transistor T11 of the first pixel is turned on, the vertical data signal Vdata corresponding to the first data voltage D1 will be transmitted to the gate of the first driving transistor T12 of the first pixel through the first switching transistor T11, and the first storage capacitor C1 of the first pixel is charged with a voltage value corresponding to the first data voltage D1.
After the first data voltage D1 is charged in the storage capacitor C1 of the first pixel, a low level signal is supplied to the vertical control signal line CL to turn on the second switching transistor T21 of the second pixel. At this time, the first switching transistor T11 of the first pixel is in an off state, and the horizontal scanning signal Scan is still maintained in a high state, i.e., the control transistor T3 is still maintained in an on state.
When the second switching transistor T21 of the second pixel is turned on, the second data voltage D2 corresponding to the vertical data signal (line) Vdata will be transmitted to the gate of the second driving transistor T22 of the second pixel through the second switching transistor T21, and the second storage capacitor C2 of the second pixel is charged with a voltage value corresponding to the second data voltage D2.
The above is a description of an embodiment of the pixel circuit of the present invention, and the display device of the present invention includes a plurality of pixel circuits, and specifically includes:
a scan driver for providing a horizontal scan signal;
a data driver for providing a vertical data driving signal;
a signal controller for providing a vertical control signal; and
and a timing controller for providing timings of the scan driver, the data driver and the control signal.
The horizontal scanning signals are provided by horizontal scanning lines, and the plurality of horizontal scanning lines and the vertical data lines form cross areas; every two adjacent horizontal lines share one horizontal scanning line. The first pixel is located in the intersection region and located on the mth horizontal line. The second pixel is positioned in the crossing area and positioned on the (m + 1) th horizontal line; the vertical control signal line is electrically connected with the first pixel and the second pixel; and the control transistor is used for transmitting the horizontal scanning signal to the first pixel and the second pixel at the same time. The display device of the present invention is not limited to the above two pixels.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (7)
1. A pixel circuit of an organic light emitting display includes a horizontal scanning signal line Scan and a vertical data signal line Vdata, characterized by further including a vertical control signal line CL, a control transistor T3, and a combined pixel cell connected to a power signal line Vdd; wherein,
the vertical control signal line CL is electrically connected with the combined pixel unit;
the horizontal scanning signal line Scan is connected with the gate of the control transistor T3, the first electrode of the control transistor T3 is connected with the vertical data signal line Vdata, and the second electrode of the control transistor T3 is connected with the combined pixel unit;
the combined pixel unit includes a first pixel and a second pixel; wherein,
the first pixel includes a first switching transistor T11, a first driving transistor T12, a first storage capacitor C1, and a first light emitting diode; and the second pixel includes a second switching transistor T21, a second driving transistor T22, a second storage capacitor C2, and a second light emitting diode;
the gates of the first switching transistor T11 and the second switching transistor T21 are connected with a vertical control signal line CL, and the first electrodes of the first switching transistor T11 and the second switching transistor T21 are connected with the second electrode of the control transistor T3 in parallel; second electrodes of the first and second switching transistors T11 and T21 are respectively connected to gates of the first and second driving transistors T12 and T22;
one of the first switch transistor T11 and the second switch transistor T21 is an N-type transistor, and the other is a P-type transistor.
2. A method of driving the pixel circuit of the organic light emitting display according to claim 1, comprising:
A. supplying a high level to the horizontal scanning signal line Scan to turn on the control transistor T3; and transmits the vertical data signal Vdata to the first and second pixels in the combined pixel unit through the first and second switching transistors T11 and T21, respectively;
B. supplying a high level to the vertical control signal line CL to turn on the first switching transistor T11 of the first pixel, and at this time, turning off the second switching transistor T21 of the second pixel;
C. the vertical control signal line CL is supplied with a low level to turn on the second switching transistor T21 of the second pixel, and at this time, the first switching transistor T11 of the first pixel is turned off.
3. The method of claim 2, wherein when the first switching transistor T11 of the first pixel is turned on in step B, the first data voltage D1 corresponding to the vertical data signal line Vdata is transmitted to the gate of the first driving transistor T12 of the first pixel through the first switching transistor T11, and the first storage capacitor C1 of the first pixel is charged with a voltage value corresponding to the first data voltage D1.
4. The method of driving the pixel circuit of the organic light emitting display according to claim 2, wherein when the second switching transistor T21 of the second pixel is turned on in step C, the second data voltage D2 corresponding to the vertical data signal line Vdata is transmitted to the gate of the second driving transistor T22 of the second pixel through the second switching transistor T21, and the second storage capacitor C2 of the second pixel is charged with a voltage value corresponding to the second data voltage D2.
5. The method for driving pixel circuit of organic light emitting display according to claim 2, further comprising before step C: the horizontal scanning signal line Scan is kept at a high level, and the control transistor T3 is kept at a conducting state.
6. A display device comprising a plurality of pixel circuits of the organic light emitting display according to claim 1,
the horizontal scanning signal line Scan and the vertical data signal line Vdata form a cross region;
the first pixels are positioned in the intersection area and positioned on the mth horizontal line;
the second pixels are positioned in the crossing region and positioned on the (m + 1) th horizontal line;
the vertical control signal line CL is electrically connected with the first pixel and the second pixel; and
the control transistor T3 is used for transmitting a horizontal scanning signal to the first pixel and the second pixel simultaneously.
7. The display device of the organic light emitting display according to claim 6, wherein each two adjacent horizontal rows share one of the horizontal scanning signal lines Scan.
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| CN201310448042.7A CN104517565B (en) | 2013-09-27 | 2013-09-27 | Image element circuit, driving method and its display device of OLED |
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| CN104517565B true CN104517565B (en) | 2017-09-29 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1455914A (en) * | 2001-01-15 | 2003-11-12 | 索尼公司 | Active-matrix display, active-matrix organic electroluminescence display, and methods for driving them |
| CN100378779C (en) * | 2003-11-25 | 2008-04-02 | Lg.菲利浦Lcd株式会社 | Electro-luminescence display device and driving method thereof |
| CN102044554A (en) * | 2009-10-16 | 2011-05-04 | 上海天马微电子有限公司 | Organic light emitting diode display for double-sided display |
| CN103268753A (en) * | 2013-05-28 | 2013-08-28 | 上海中科高等研究院 | AMOLED drive circuit sharing scanning lines and driving method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100665943B1 (en) * | 2005-06-30 | 2007-01-09 | 엘지.필립스 엘시디 주식회사 | AMOLED and driving method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455914A (en) * | 2001-01-15 | 2003-11-12 | 索尼公司 | Active-matrix display, active-matrix organic electroluminescence display, and methods for driving them |
| CN100378779C (en) * | 2003-11-25 | 2008-04-02 | Lg.菲利浦Lcd株式会社 | Electro-luminescence display device and driving method thereof |
| CN102044554A (en) * | 2009-10-16 | 2011-05-04 | 上海天马微电子有限公司 | Organic light emitting diode display for double-sided display |
| CN103268753A (en) * | 2013-05-28 | 2013-08-28 | 上海中科高等研究院 | AMOLED drive circuit sharing scanning lines and driving method thereof |
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