CN107038989B - Organic light emitting display and driving method thereof - Google Patents
Organic light emitting display and driving method thereof Download PDFInfo
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Abstract
In the organic light emitting display and the driving method thereof provided by the invention, the reset circuit composed of the first test signal line, the second test signal line and the reset transistor is used for carrying out voltage reset on the pixel unit in the display area, so that the TFT hysteresis effect is avoided, and meanwhile, the reset circuit is positioned in the non-display area, so that the adverse effect on the aperture ratio and the resolution ratio can be avoided.
Description
Technical Field
The invention relates to the technical field of flat panel display, in particular to an organic light emitting display and a driving method thereof.
Background
In recent years, with the rapid development and application of information technology, wireless mobile communication and information appliances, people have increasingly depended on electronic products, and various display technologies and display devices have been developed. Flat panel display devices have been widely used because they are fully planar, light, thin, and power-saving.
The Organic light Emitting display is a flat panel display device that displays images by using Organic Light Emitting Diodes (OLEDs), and is an active light Emitting display, and the display mode of the Organic light Emitting display is different from that of a conventional Thin Film Transistor liquid crystal display (TFT-LCD), and does not need a backlight, and the Organic light Emitting display has many advantages of high contrast, fast response speed, wide viewing angle, light weight, and the like. Therefore, the organic light emitting display is known as a new generation display that can replace the thin film transistor liquid crystal display.
Please refer to fig. 1, which is a circuit diagram of an organic light emitting display according to the prior art. As shown in fig. 1, the conventional organic light emitting display 100 includes a display region and a non-display region surrounding the display region, the display region is provided with a power line vdd, a Scan line, a data line data, and a pixel array defined by the Scan line and the data line data, the pixel array includes a plurality of pixel units arranged in a matrix, each pixel unit includes an organic light emitting diode OLED and a pixel circuit 10 for driving the organic light emitting diode OLED, the pixel circuit 10 includes a switching transistor T1, a driving transistor T2, and a storage capacitor Cs, a gate of the switching transistor T1 is connected to the Scan line, a source of the switching transistor T1 is connected to the data line data, a gate of the driving transistor T2 is connected to a drain of the switching transistor T1, a source of the driving transistor T2 is connected to the power line vdd, the drain of the driving transistor T2 is connected to the anode of the organic light emitting diode OLED, and the cathode of the organic light emitting diode OLED is grounded.
When the switching transistor T1 is turned on by the Scan line, the data signal provided by the data line data is written into the storage capacitor Cs, the storage capacitor Cs is connected to the gate of the driving transistor T2 to control the current flowing through the driving transistor T2, and the driving current output by the driving transistor T2 drives the organic light emitting diode OLED to emit light of different gray scales, so that the organic light emitting diode OLED emits light of different gray scales.
The organic light emitting display 100 requires that the driving transistor T2 can ensure the stability of the output current, that is, the driving current output by the driving transistor T2 in the pixel circuit 10 can maintain the time identity and the spatial uniformity under the condition that the gate voltages are the same. However, a Thin Film Transistor (TFT) is commonly used as the driving Transistor T2, and the transfer characteristics of the TFT are different during the process that the gate voltage changes from positive voltage to negative voltage (forward scanning) and from negative voltage to positive voltage (reverse scanning), and the threshold voltage of the reverse scanning is usually smaller than that of the forward scanning, which is called TFT hysteresis effect. The TFT hysteresis effect may cause non-uniformity of the driving current in time, so that the organic light emitting display 100 may display an image with poor display, such as image sticking.
In order to avoid the TFT hysteresis effect, the prior art generally adopts a design method of adding a reset transistor in the pixel circuit, and initializes the storage capacitor Cs of the pixel circuit through the reset transistor, so that the direction of the charging current is the same when the data signal provided by the data line data is charged into the storage capacitor Cs. Fig. 2 is a circuit diagram of an organic light emitting display with a reset transistor added in the prior art. As shown in fig. 2, in the conventional organic light emitting display 200, a first Scan line1, a reset signal line Vref, and a reset transistor T3 are added to the organic light emitting display 100 shown in fig. 1, a gate of the reset transistor T3 is connected to the first Scan line1, a source of the reset transistor T3 is connected to the reset signal line Vref, and a drain of the reset transistor T3 is connected to one end of the storage capacitor Cs.
Before the switching transistor T1 is turned on, the reset transistor T3 is turned on by the first Scan line1, so that the gate voltage of the driving transistor T2 is reset to a low level. Thereafter, the switching transistor T1 is turned on by the second Scan line2, so that the data signal supplied from the data line data is loaded to the gate of the driving transistor T2. Thus, the current variation of the driving transistor T2 (i.e., the charging direction into the storage capacitor Cs) is always in one direction.
However, although the TFT hysteresis effect can be improved by adopting such a driving method, compared with the pixel circuit 10 with a 2T1C type circuit structure, the pixel circuit 20 has an additional transistor, which increases the area of the pixel unit and reduces the aperture ratio of the pixel unit, and the resolution of the display is also reduced by adding the first Scan line1 and the reset signal line Vref to the display region.
Therefore, how to solve the problem that the prior organic light emitting display affects the aperture ratio and the resolution ratio due to the improvement of the TFT hysteresis effect becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The present invention is directed to an organic light emitting display and a driving method thereof, so as to solve the problem that the aperture ratio and the resolution are affected by improving the TFT hysteresis effect in the conventional organic light emitting display.
To solve the above problems, the present invention provides an organic light emitting display including: a display area and a non-display area surrounding the display area;
the display area comprises a scanning line, a data line and a pixel array defined by the scanning line and the data line, the pixel array comprises a plurality of pixel units which are arranged in a matrix manner, and each pixel unit comprises an organic light-emitting diode and a pixel circuit for driving the organic light-emitting diode;
the non-display area comprises a first test wire, a second test wire and a reset transistor, the grid electrode of the reset transistor is connected with the second test wire, the source electrode of the reset transistor is connected with the first test wire, and the drain electrode of the reset transistor is connected with the data line.
Optionally, the organic light emitting display further includes a power line, and the power line is parallel to the data line and connected to the pixel unit.
Optionally, in the organic light emitting display, the pixel circuit includes a first transistor, a second transistor, and a storage capacitor, a gate of the first transistor is connected to the scan line, a source of the first transistor is connected to the data line, a gate of the second transistor, a drain of the first transistor, and a second substrate of the storage capacitor are all connected to a node, a source of the second transistor and a first substrate of the storage capacitor are all connected to the power line, a drain of the second transistor is connected to an anode of the organic light emitting diode, and a cathode of the organic light emitting diode is grounded.
Optionally, in the organic light emitting display, the first transistor, the second transistor, and the reset transistor are all thin film transistors.
Optionally, in the organic light emitting display, the first test trace is used to transmit a data signal at a box forming test stage, and the first test trace is used to transmit a reset signal at a module stage.
Optionally, in the organic light emitting display, the non-display region further includes a low-level signal line, a first scan control line, a second scan control line, a low-level gate circuit, and a scan signal output terminal;
the low-level signal line, the first scanning control line and the second scanning control line are arranged in parallel; the low-level gating circuit is arranged between the scanning signal output end and the scanning lines of the display area and is respectively connected with the scanning lines and the scanning signal output end.
Optionally, in the organic light emitting display, the low level gating circuit includes a fourth transistor and a fifth transistor, a gate of the fourth transistor is connected to the first scan control line, a source of the fourth transistor is connected to the scan signal output terminal, a gate of the fifth transistor is connected to the second scan control line, a source of the fifth transistor is connected to the low level signal line, and drains of the fourth transistor and the fifth transistor are both connected to the corresponding scan lines.
Optionally, in the organic light emitting display, the fourth transistor and the fifth transistor are both thin film transistors.
Accordingly, the present invention also provides a driving method of an organic light emitting display, the driving method of the organic light emitting display including:
in a data writing time period, a scanning signal provided by a scanning line is changed from a high level to a low level, a first transistor is turned on, a data signal is written in through the first transistor, and a second transistor is conducted and outputs a driving current, so that an organic light emitting diode is lightened to emit light; and
stopping writing the data signal in the interval period; meanwhile, a scanning signal provided by the scanning line, a reset signal provided by the first testing wire and a testing signal provided by the second testing wire are all changed from a high level to a low level, the first transistor and the reset transistor are turned on, and the grid voltage of the second transistor is reset to the low level.
Optionally, in the driving method of the organic light emitting display, in a data writing period, a first scan control signal provided by a first scan control line is kept at a low level, and a second scan control signal provided by a second scan control line is kept at a high level; and
in the interval period, the first scan control signal provided by the first scan control line changes from low level to high level, and the second scan control signal provided by the second scan control line changes from high level to low level.
In the organic light emitting display and the driving method thereof provided by the invention, the reset circuit composed of the first test signal line, the second test signal line and the reset transistor is used for carrying out voltage reset on the pixel unit in the display area, so that the TFT hysteresis effect is avoided, and meanwhile, the reset circuit is positioned in the non-display area, so that the adverse effect on the aperture ratio and the resolution ratio can be avoided.
Drawings
Fig. 1 is a circuit diagram of a related art organic light emitting display;
fig. 2 is a circuit diagram of a related art organic light emitting display to which a reset transistor is added;
FIG. 3 is a circuit diagram of an organic light emitting display according to a first embodiment of the present invention;
FIG. 4 is a timing diagram illustrating a driving method of an organic light emitting display according to a first embodiment of the present invention;
FIG. 5 is a circuit diagram of an organic light emitting display according to a second embodiment of the present invention;
fig. 6 is a timing diagram of a driving method of an organic light emitting display according to a second embodiment of the invention.
Detailed Description
An organic light emitting display and a driving method thereof according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
[ EXAMPLES one ]
Please refer to fig. 3, which is a circuit diagram of an organic light emitting display according to a first embodiment of the present invention. As shown in fig. 3, the organic light emitting display 300 includes: a display area and a non-display area surrounding the display area; the display area comprises a scanning line Scan line, a data line data and a pixel array defined by the scanning line Scan line and the data line data, the pixel array comprises a plurality of pixel units arranged in a matrix, and each pixel unit comprises an organic light emitting diode OLED and a pixel circuit 30 for driving the organic light emitting diode OLED; the non-display area comprises a first test trace CT1, a second test trace CT2 and a reset transistor T3, the gate of the reset transistor T3 is connected with the second test trace CT2, the source of the reset transistor T3 is connected with the first test trace CT1, and the drain of the reset transistor T3 is connected with the data line data.
Specifically, the display area is also referred to as an AA area, and the display area further includes a power line vdd, which is disposed in parallel with the data line data and connected to the pixel unit. The pixel unit comprises an organic light emitting diode OLED and a pixel circuit 30, wherein the pixel circuit 30 comprises a first transistor T1, a second transistor T2 and a storage capacitor Cs, the grid electrode of the first transistor T1 is connected with a Scan line Scan line, the source electrode of the first transistor T1 is connected with a data line data, the grid electrode of the second transistor T2, the drain electrode of the first transistor T1 and the second substrate of the storage capacitor Cs are all connected with a node N, the source electrode of the second transistor T2 and the first substrate of the storage capacitor Cs are all connected with a power line vdd, the drain electrode of the second transistor T2 is connected with the anode of the organic light emitting diode OLED, and the cathode of the organic light emitting diode OLED is grounded.
As shown in fig. 3, the pixel circuit 30 is a 2T1C type circuit structure, and includes 2 transistors and 1 capacitor. The first transistor T1 serves as a switching transistor, the Scan line Scan is used for controlling the first transistor T1 to be turned on and off, and the second transistor T2 serves as a driving transistor.
Referring to fig. 3, the first Test trace CT1, the second Test trace CT2 and the reset transistor T3 are disposed in the non-display area, the second Test trace CT2 is used for controlling the on and off of the reset transistor T3, the first Test trace CT1 is used for transmitting a data signal in a Cell Test (Cell Test) stage, and the first Test trace CT1 is used for transmitting a reset signal in a module stage.
In this embodiment, the first transistor T1, the second transistor T2, and the reset transistor T3 are all P-type thin film transistors. In other embodiments, the first transistor T1, the second transistor T2, and the reset transistor T3 may all be N-type thin film transistors.
When the Scan signal supplied from the Scan line transitions to a low level, the first transistor T1 is turned on. At this time, the data signal provided from the data line data is written into the node N through the first transistor T1. When the data signal provided by the data line data transits to a low level, the second transistor T2 is turned on and outputs a driving current, so that the organic light emitting diode OLED is turned on to emit light.
When the Scan signal provided by the Scan line and the test signal provided by the second test trace CT2 both transition to a low level, the first transistor T1 and the reset transistor T3 are both turned on. At this time, the reset signal provided by the first test trace CT1 is written into the node N through the reset transistor T3 and the first transistor T1, so that the gate voltage of the second transistor T2 is reset to the initial voltage.
In the organic light emitting display 300 of the present embodiment, the pixel units in the display area are reset by the testing traces in the non-display area, so that the TFT hysteresis effect can be avoided without adding a reset transistor and corresponding traces in the display area. The organic light emitting display 300 can avoid the TFT hysteresis effect on the basis of ensuring the aperture ratio and the resolution.
Correspondingly, the invention also provides a driving method of the organic light emitting display. Referring to fig. 3 and 4 in combination, the driving method of the organic light emitting display includes:
in the interval time period T, the Scan signal provided by the Scan line, the reset signal provided by the first test trace CT1 and the test signal provided by the second test trace CT2 all change from a high level to a low level, the first transistor T1 and the reset transistor T3 are turned on, and the gate voltage of the second transistor T2 is reset to a low level.
Specifically, the Scan signal supplied by the Scan line Scan scans the pixel array line by line, and the Scan cycle includes a data writing period and an interval period t.
In the data writing period, the Scan signal supplied from the Scan line is changed from a high level to a low level, the first transistor T1 is turned on, the data signal supplied from the data line data is written into the node N, and when the data signal supplied from the data line data is transited from the high level to the low level, the second transistor T2 is turned on and outputs a driving current, so that the organic light emitting diode OLED is turned on to emit light.
In the interval period T, the data signal provided by the data line data stops writing, the Scan signal provided by the Scan line and the test signal provided by the second test trace CT2 both change from high level to low level VGL, the first transistor T1 and the reset transistor T3 are turned on, and at the same time, the reset signal provided by the first test trace CT1 changes from high level to low level Vref, so that the potential of the node N (i.e., the gate voltage of the second transistor T2) is reset to the low level Vref.
After the interval period T, since the gate voltage of the second transistor T2 is reset to the low level Vref, the voltage changes in the same direction every time the data signal is written.
Repeating the working process of the data writing time period and the interval time period t, thereby completing the image display function.
In this embodiment, the potential of the node N is reset in the interval period t by using the timing signal shown in fig. 4, and the voltage changes in the same direction when the data signal is written in the data writing period. Therefore, the driving method of the organic light emitting display can avoid the TFT hysteresis effect.
[ example two ]
Please refer to fig. 5, which is a circuit diagram of an organic light emitting display according to a second embodiment of the present invention. As shown in fig. 5, the organic light emitting display 400 includes: a display area and a non-display area surrounding the display area; the display area comprises a scanning line Scan line, a data line data and a pixel array defined by the scanning line Scan line and the data line data, the pixel array comprises a plurality of pixel units arranged in a matrix, and each pixel unit comprises an organic light emitting diode OLED and a pixel circuit 30 for driving the organic light emitting diode OLED; the non-display area comprises a first test trace CT1, a second test trace CT2 and a reset transistor T3, the gate of the reset transistor T3 is connected with the second test trace CT2, the source of the reset transistor T3 is connected with the first test trace CT1, and the drain of the reset transistor T3 is connected with the data line data.
Specifically, the difference between the present embodiment and the first embodiment is that the non-display area further includes a low-level signal line VGL, a first scan control line SW-1, a second scan control line SW-2, a low-level gate circuit 40, and a scan signal output terminal 50; the low level signal line VGL, the first Scan control line SW-1 and the second Scan control line SW-2 are arranged in parallel, and the low level gate circuit 40 is arranged between the Scan signal output terminal 50 and the Scan line of the display region and is respectively connected with the Scan line and the Scan signal output terminal 50; each of the low-level gate circuits 40 includes a fourth transistor T4 and a fifth transistor T5, a gate of the fourth transistor T4 is connected to the first Scan control line SW-1, a source of the fourth transistor T4 is connected to the Scan signal output terminal 50, a gate of the fifth transistor T5 is connected to the second Scan control line SW-2, a source of the fifth transistor T5 is connected to the low-level signal line VGL, and drains of the fourth transistor T4 and the fifth transistor T5 are connected to the corresponding Scan line.
In this embodiment, the fourth transistor T4 and the fifth transistor T5 are both thin film transistors.
Referring to fig. 5 and fig. 6 in combination, the driving method of the organic light emitting display includes:
in a data writing time period, a first Scan control signal provided by the first Scan control line SW-1 is kept at a low level, a second Scan control signal provided by the second Scan control line SW-2 is kept at a high level, and at this time, the Scan line normally outputs a Scan signal;
in the interval period t, the first Scan control signal supplied by the first Scan control line SW-1 changes from a low level to a high level, the second Scan control signal supplied by the second Scan control line SW-2 changes from a high level to a low level, and the Scan lines Scan line of all the rows output a low level VGL.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
In summary, in the organic light emitting display and the driving method thereof provided by the present invention, the voltage resetting is performed on the pixel units in the display area through the test signal lines located in the non-display area, so that the TFT hysteresis effect can be avoided on the basis of ensuring the aperture ratio and the resolution.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (9)
1. An organic light emitting display, comprising: a display area and a non-display area surrounding the display area;
the display area comprises a plurality of scanning lines, a plurality of data lines and a pixel array defined by the scanning lines and the data lines, the pixel array comprises a plurality of pixel units which are arranged in a matrix manner, and each pixel unit comprises an organic light-emitting diode and a pixel circuit for driving the organic light-emitting diode;
the non-display area comprises a first test wire, a second test wire and a reset transistor, the grid electrode of the reset transistor is connected with the second test wire, the source electrode of the reset transistor is connected with the first test wire, and the drain electrode of the reset transistor is connected with the data line;
the non-display area also comprises a low-level signal line, a low-level gating circuit and a plurality of scanning signal output ends; the gating input end of the low-level gating circuit is respectively connected with the low-level signal line and the plurality of scanning signal output ends, and the output end of the low-level gating circuit is connected with the scanning line so as to select to conduct the low-level signal line or the scanning signal output end with the scanning line by using the low-level gating circuit; and the same low-level signal line is connected with a plurality of scanning lines through the low-level gating circuit;
wherein the non-display region further includes a first scan control line and a second scan control line; and the low-level gating circuit comprises a fourth transistor and a fifth transistor, the grid electrode of the fourth transistor is connected with the first scanning control line, the source electrode of the fourth transistor is connected with the scanning signal output end, the grid electrode of the fifth transistor is connected with the second scanning control line, the source electrode of the fifth transistor is connected with the low-level signal line, and the drain electrodes of the fourth transistor and the fifth transistor are connected with the corresponding scanning lines.
2. The organic light emitting display of claim 1, further comprising a power line disposed in parallel with the data line and connected to the pixel unit.
3. The organic light emitting display according to claim 2, wherein the pixel circuit includes a first transistor, a second transistor, and a storage capacitor, a gate of the first transistor is connected to the scan line, a source of the first transistor is connected to the data line, a gate of the second transistor, a drain of the first transistor, and a second substrate of the storage capacitor are all connected to a node, a source of the second transistor and a first substrate of the storage capacitor are all connected to a power supply line, a drain of the second transistor is connected to an anode of the organic light emitting diode, and a cathode of the organic light emitting diode is grounded.
4. The organic light emitting display of claim 3, wherein the first transistor, the second transistor, and the reset transistor are all thin film transistors.
5. The organic light emitting display of claim 1, wherein the first test trace is used to transmit data signals during a box-in-box test phase and the first test trace is used to transmit reset signals during a module phase.
6. The organic light emitting display according to claim 1, wherein the low-level signal line, the first scan control line, and the second scan control line are arranged in parallel; the low level gate circuit is arranged between the scanning signal output end and the scanning lines of the display area.
7. The organic light emitting display of claim 1, wherein the fourth transistor and the fifth transistor are both thin film transistors.
8. A driving method of an organic light emitting display according to any one of claims 1 to 7, wherein the pixel circuit includes a first transistor, a second transistor, and a storage capacitor, a gate of the first transistor is connected to a scan line, a source of the first transistor is connected to a data line, a gate of the second transistor, a drain of the first transistor, and a second substrate of the storage capacitor are all connected to a node, and a drain of the second transistor is connected to the organic light emitting diode;
wherein the driving method comprises:
in a data writing time period, a scanning signal provided by a scanning line is changed from a high level to a low level, a first transistor is turned on, a data signal is written in through the first transistor, and a second transistor is conducted and outputs a driving current, so that an organic light emitting diode is lightened to emit light; and
stopping writing the data signal in the interval period; meanwhile, a scanning signal provided by the scanning line, a reset signal provided by the first testing wire and a testing signal provided by the second testing wire are all changed from a high level to a low level, the first transistor and the reset transistor are turned on, and the grid voltage of the second transistor is reset to the low level.
9. The driving method of an organic light emitting display according to claim 8, wherein in the data writing period, a first scan control signal supplied from a first scan control line is kept at a low level, and a second scan control signal supplied from a second scan control line is kept at a high level; and
in the interval period, the first scan control signal provided by the first scan control line changes from low level to high level, and the second scan control signal provided by the second scan control line changes from high level to low level.
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| US10615244B2 (en) | 2018-04-20 | 2020-04-07 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | OLED display panel having reset signal lines to reset pixel units and display device with the same |
| CN108335667B (en) * | 2018-04-20 | 2020-09-04 | 武汉华星光电半导体显示技术有限公司 | OLED display panel and display device |
| CN108831360A (en) * | 2018-06-22 | 2018-11-16 | 京东方科技集团股份有限公司 | Gate drive signal detection circuit, method and display device |
| CN108877645A (en) * | 2018-07-24 | 2018-11-23 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display panel, mosaic screen |
| CN109637380B (en) * | 2019-01-28 | 2021-04-13 | 昆山国显光电有限公司 | Display panel and display device |
| CN109712571A (en) * | 2019-03-19 | 2019-05-03 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display device |
| CN110599955B (en) * | 2019-09-19 | 2021-02-09 | 昆山工研院新型平板显示技术中心有限公司 | Display panel and display device |
| US20240057408A1 (en) * | 2021-03-22 | 2024-02-15 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Display substrate and display device |
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