CN115762414A - AMOLED display driving circuit, display panel and display driving method - Google Patents
AMOLED display driving circuit, display panel and display driving method Download PDFInfo
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Abstract
The invention provides an AMOLED display driving circuit, a display panel and a display driving method.A first light-emitting control module does not receive a first control signal, and when a second light-emitting control module receives a second control signal, the light-emitting module is in a pre-light-emitting stage; the first light-emitting control module receives the first control signal, and when the second light-emitting control module receives the second control signal, the light-emitting module is in a light-emitting stage; wherein the pre-lighting phase occurs after the phase of initializing the anode voltage of the light emitting module and before the lighting phase of the light emitting module. After the anode potential of the light-emitting module is initialized, a pre-light-emitting stage is generated, so that the drain voltage of the driving transistor is kept relatively stable, and then the driving transistor is controlled to generate driving current to enable the light-emitting module to emit light, so that the current fluctuation is reduced, and the light-emitting stability is improved.
Description
Technical Field
The invention relates to the technical field of display driving, in particular to an AMOLED display driving circuit, a display panel and a display driving method.
Background
The AMOLED display panel is popular with consumers because of its advantages of wide viewing angle, wide color gamut, short response time, thinness, and flexibility. The mainstream of the thin film transistor substrate for driving the AMOLED is prepared by a Low Temperature Polysilicon (LTPS) technology. In the manufacturing process of an LTPS thin film transistor (LTPS-TFT), characteristic indexes such as threshold voltage (Vth) and the like have certain fluctuation on the scale of a display screen, and the fluctuation has a non-negligible influence on the picture quality of an AMOLED display driven by the LTPS thin film transistor.
As mainstream application display screens for displaying consumer electronics and the like are gradually changed into AMOLED materials, the requirements of consumers on image quality are more and more severe. In addition, due to the demand of consumers for reducing display power consumption, the efficiency of the organic light emitting material of the AMOLED is higher and higher, so that the dependence of the display quality of the current-driven AMOLED on the precise control of the TFT current is more prominent, and especially at a lower gray scale, the display effect is more sensitive to the fluctuation of the TFT current output. Therefore, it is important to reduce the fluctuation of the current of the driving TFT as much as possible. The invention provides a light emitting time sequence of a driving circuit to improve the display image quality of an AMOLED display panel.
Disclosure of Invention
Based on the background technology, the invention provides an AMOLED display driving circuit, a display panel and a display driving method, and aims to solve the technical problems that the current fluctuation of the display driving circuit is large and the like.
An AMOLED display driver circuit, comprising:
a driving transistor for supplying a driving current for making the light emitting module emit light;
the storage module is connected with the driving transistor and used for storing the grid voltage of the driving transistor;
the first initialization module is connected with the storage module and used for initializing the storage module;
the data writing module is connected with the driving transistor and is used for writing the data signal into the driving transistor;
the second initialization module is connected with the anode of the light-emitting module and used for initializing the anode voltage of the light-emitting module;
the first light-emitting control module is respectively connected with the source electrode and the anode voltage of the driving transistor and is used for controlling the source electrode and the anode voltage of the driving transistor to be connected when receiving a first control signal;
the second light-emitting control module is connected with the drain electrode of the driving transistor, connected with the anode of the light-emitting module and used for controlling the drain electrode of the driving transistor to be communicated with the anode of the light-emitting module when receiving a second control signal;
when the first light-emitting control module does not receive the first control signal and the second light-emitting control module receives the second control signal, the light-emitting module is in a pre-light-emitting stage;
the first light-emitting control module receives the first control signal, and when the second light-emitting control module receives the second control signal, the light-emitting module is in a light-emitting stage;
wherein the pre-lighting phase occurs after the phase of initializing the anode voltage of the light emitting module and before the lighting phase of the light emitting module.
Furthermore, the storage module is a capacitor, a first end of the capacitor is connected with the grid of the driving transistor, and a second end of the capacitor is connected with the anode voltage.
Further, the first initialization module comprises:
and the first grid electrode and the second grid electrode of the initialization double-grid transistor are both connected with the first scanning signal end, the source electrode of the initialization double-grid transistor is connected with an initialization voltage, and the drain electrode of the initialization double-grid transistor is connected with the first end of the capacitor.
Further, the data writing module comprises:
and the source electrode of the data writing transistor is connected with the data signal end, the drain electrode of the data writing transistor is connected with the source electrode of the driving transistor, and the grid electrode of the data writing transistor is connected with the second scanning signal end.
Further, the device further comprises a compensation module, connected to the driving transistor, for compensating for a threshold voltage of the driving transistor, wherein the compensation module comprises:
and the first grid electrode and the second grid electrode of the double-grid compensation transistor are both connected with the second scanning signal end, the source electrode of the double-grid compensation transistor is connected with the grid electrode of the driving transistor, and the drain electrode of the double-grid compensation transistor is connected with the drain electrode of the driving transistor.
Further, the second initialization module includes an initialization transistor, a gate of the initialization transistor is connected to the third scan signal terminal, a source of the initialization transistor is connected to the initialization voltage, and a drain of the initialization transistor is connected to the anode of the light emitting module.
Furthermore, the first light emitting control module comprises a first light emitting control transistor, a grid electrode of the first light emitting control transistor (T4) is connected with a first control signal end, a source electrode of the first light emitting control transistor is connected with anode voltage, and a drain electrode of the first light emitting control transistor is connected with a source electrode of the driving transistor.
Furthermore, the second light-emitting control module comprises a second light-emitting control transistor, a gate of the second light-emitting control transistor is connected with the second control signal terminal, a source of the second light-emitting control transistor is connected with a drain of the driving transistor, and a drain of the second light-emitting control transistor is connected with an anode of the light-emitting module.
An AMOLED display panel includes a light emitting module and the AMOLED display driving circuit.
An AMOLED display driving method using the AMOLED display driving circuit includes:
a first initialization stage, receiving a first scanning signal, enabling a first initialization module to be conducted, and initializing a storage module;
a signal writing stage, receiving a second scanning signal, enabling the source electrode of the driving transistor to be connected with the data signal end, and writing the data signal into the driving transistor;
a second initialization stage, receiving a third scanning signal, turning on a second initialization module, and initializing the anode of the light emitting module;
a pre-lighting stage, receiving a second control signal to make the drain electrode of the driving transistor and the anode of the lighting module conducted;
and in the light emitting stage, the first control signal and the second control signal are received at the same time, so that the source electrode of the driving transistor is conducted with the anode voltage, the drain electrode of the driving transistor is conducted with the anode of the light emitting module, and the driving transistor generates driving current to enable the light emitting module to emit light.
The beneficial technical effects of the invention are as follows: after the anode potential of the light-emitting module is initialized, a pre-light-emitting stage is generated, so that the drain voltage of the driving transistor is maintained to be relatively stable, and then the driving transistor is controlled to generate driving current to enable the light-emitting module to emit light, so that the current fluctuation is reduced, and the light-emitting stability is improved.
Drawings
FIG. 1 is a block diagram of an AMOLED display driving circuit according to the present invention;
FIG. 2 is a circuit diagram of an AMOLED display driving circuit according to the present invention;
FIG. 3 is a timing diagram of signal generation in an AMOLED display driving method according to the present invention;
fig. 4 is a flowchart illustrating a method for driving an AMOLED display according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, the present invention provides an AMOLED display driving circuit, including:
a drive transistor (T2) for supplying a drive current for causing the light emitting module (1) to emit light;
the storage module (2) is connected with the driving transistor (T2) and is used for storing the grid voltage of the driving transistor (T2);
the first initialization module (3) is connected with the storage module (2) and is used for initializing the storage module (2);
the data writing module (4) is connected with the driving transistor (T2) and is used for writing a data signal into the driving transistor (T2);
the second initialization module (5) is connected with the anode of the light-emitting module (1) and is used for initializing the anode voltage of the light-emitting module (1);
the first light emitting control module (6) is respectively connected with the source electrode of the driving transistor (T2) and the anode voltage (ELVDD) and is used for receiving a first control signal to control the source electrode of the driving transistor (T2) to be connected with the anode voltage (ELVDD);
the second light-emitting control module (7) is connected with the drain electrode of the driving transistor (T2), is connected with the anode of the light-emitting module (1) and is used for receiving a second control signal to control the connection between the drain electrode of the driving transistor (T2) and the anode of the light-emitting module (1);
when the first light-emitting control module (6) receives the first control signal and the second light-emitting control module (7) receives the second control signal, the light-emitting module (1) is in a light-emitting stage;
when the first light-emitting control module (6) does not receive the first control signal and the second light-emitting control module (7) receives the second control signal, the light-emitting module (1) is in a pre-light-emitting stage;
wherein the pre-lighting phase occurs after the initialization of the anode voltage of the light emitting module (1) and before the lighting phase.
The invention also comprises a pre-lighting stage before the lighting stage, and the stability of the drain voltage of the driving transistor, namely the voltage stability of the anode of the lighting module, is maintained through the pre-lighting stage, so that the current fluctuation is reduced, and the lighting stability of the OLED is improved.
Further, the memory module (1) is a capacitor (Cst), a first end of the capacitor (Cst) is connected to the gate of the driving transistor (T2), and a second end of the capacitor (Cst) is connected to the anode voltage (ELVDD).
Further, the first initialization module (3) comprises:
and the first grid and the second grid of the initialization double-grid transistor (T6) are both connected with the first scanning signal end, the source electrode of the initialization double-grid transistor (T6) is connected with an initialization voltage (Vint), and the drain electrode of the initialization double-grid transistor (T6) is connected with the first end of the capacitor (Cst).
Further, the data writing module (4) comprises:
and the source electrode of the data writing transistor (T1) is connected with the data signal end, the drain electrode of the data writing transistor (T1) is connected with the source electrode of the driving transistor (T2), and the grid electrode of the data writing transistor (T1) is connected with the second scanning signal end.
Furthermore, the circuit also comprises a compensation module (8) which is connected with the driving transistor (T2) and is used for compensating the threshold voltage of the driving transistor (T2), and the compensation module (T3) comprises:
and the first grid electrode and the second grid electrode of the double-grid compensation transistor (T3) are both connected with the second scanning signal end, the source electrode of the double-grid compensation transistor (T3) is connected with the grid electrode of the driving transistor (T2), and the drain electrode of the double-grid compensation transistor (T3) is connected with the drain electrode of the driving transistor (T2).
Furthermore, the second initialization module (7) comprises an initialization transistor (T7), the gate of the initialization transistor (T7) is connected to the third scanning signal terminal, the source of the initialization transistor (T7) is connected to the initialization voltage (Vint), and the drain of the initialization transistor (T7) is connected to the anode of the light emitting module (1).
Further, the first light emitting control module (6) comprises a first light emitting control transistor (T4), a gate of the first light emitting control transistor (T4) is connected to the first control signal terminal, a source of the first light emitting control transistor (T4) is connected to the anode voltage (ELVDD), and a drain of the first light emitting control transistor (T4) is connected to the source of the driving transistor (T2).
Further, the second light emission control module (7) includes a second light emission control transistor (T5), a gate of the second light emission control transistor (T5) is connected to the second control signal terminal, a source of the second light emission control transistor (T5) is connected to a drain of the driving transistor (T2), and a drain of the second light emission control transistor (T5) is connected to an anode of the light emitting module (1).
Specifically, the cathode of the light emitting module is connected to a cathode voltage (ELVSS), and the light emitting module is an organic light emitting semiconductor, i.e., an OLED device.
Specifically, the data writing transistor (T1), the first light emission control transistor (T4), the second light emission control transistor (T5), and the initializing transistor T7 are all thin film transistors.
The invention also provides an AMOLED display panel, which comprises the light emitting module (1) and the AMOLED display driving circuit.
Referring to fig. 3-4, the present invention further provides an AMOLED display driving method, using the AMOLED display driving circuit as described above, including:
a first initialization stage, receiving a first scanning signal, enabling a first initialization module to be conducted, and initializing a storage module;
a data signal writing stage, receiving a second scanning signal, enabling the source electrode of the driving transistor to be connected with the data signal end, and writing the data signal into the driving transistor;
a second initialization stage, receiving a third scanning signal, turning on a second initialization module, and initializing the anode of the light emitting module;
the pre-lighting stage is used for receiving a second control signal to enable the drain electrode of the driving transistor to be conducted with the anode of the lighting module;
and in the light emitting stage, the first control signal and the second control signal are received at the same time, so that the source electrode of the driving transistor is conducted with the anode voltage, the drain electrode of the driving transistor is conducted with the anode of the light emitting module, and the driving transistor generates driving current to enable the light emitting module to emit light.
Further, in the first initialization stage, the received first scanning signal is at a low level, and the first control signal and the second control signal are both at a high level.
Further, in the data signal writing stage, the second scan signal is at a low level, and both the first control signal and the second control signal are at a high level.
Further, in the second initialization stage, the third scan signal is at a low level, and both the first control signal and the second control signal are at a high level.
Furthermore, in the pre-lighting period, the first control signal maintains a high level, and the second control signal changes from the high level to a low level.
Further, in the light emitting stage, the first control signal changes from high level to low level, and the second control signal maintains low level.
As can be seen from fig. 3-4, when the first scan signal Sn-1 outputted from the first scan signal terminal is at a low level, the initialization dual-gate transistor (T6) is turned on, and the capacitor (Cst) starts to initialize, i.e., the first initialization stage.
When the second scan signal Sn is at a low level, the data writing transistor (T1) is turned on to write the data signal into the driving transistor T2, and the compensation double gate transistor T3 is turned on to compensate for the threshold voltage of the driving transistor (T2), that is, the data signal writing stage.
Next, the third scan signal Sn +1 is at a low level, the initialization transistor T7 is turned on, and the potential of the anode of the light emitting module is initialized, that is, the second initialization stage.
In the first initialization stage, the second initialization stage and the data writing stage, the first control signal and the second control signal are both at a high level.
After the second initialization stage, the second control signal En-1 is changed from a high level to a low level, en still maintains the high level, the second light-emitting control transistor T5 is turned on, the first light-emitting control transistor T4 is turned off, at this time, after the data signal is written, the drain potential N1 of the driving transistor T2 is shorted with the anode potential N2 after the light-emitting module is initialized, and the drain potential of the driving transistor T2 tends to a certain voltage, which is the pre-light-emitting stage.
Then, en-1 maintains the low level, en changes from the high level to the low level, the first light-emitting control transistor T4 and the second light-emitting control transistor T5 are both turned on, the light-emitting module emits light normally, the drain potential of the driving transistor T2 at this time maintains relatively stable, the current fluctuation can be reduced, and the light-emitting stability of the OLED, that is, the light-emitting stage, is improved.
In the prior art, a pre-luminescence phase is not provided, the second initialization phase directly enters a luminescence phase, when Sn +1 is in a low level, OLED initialization voltage is written to an N2 node, then En is changed from a high level to a low level, T5 and T4 are controlled to be simultaneously opened, the drain electrode potential N1 of a driving transistor T2 is pulled by the potential of an N2 point, the current output of the OLED luminescence initial phase is changed by the change of the drain electrode voltage of the driving transistor T2, and therefore the luminescence brightness of the OLED is interfered.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. An AMOLED display driving circuit, comprising:
a driving transistor for supplying a driving current for making the light emitting module emit light;
the storage module is connected with the driving transistor and used for storing the grid voltage of the driving transistor;
the first initialization module is connected with the storage module and used for initializing the storage module;
the data writing module is connected with the driving transistor and is used for writing a data signal into the driving transistor;
the second initialization module is connected with the anode of the light-emitting module and used for initializing the anode voltage of the light-emitting module;
the first light-emitting control module is respectively connected with the source electrode and the anode voltage of the driving transistor and is used for controlling the source electrode of the driving transistor to be connected with the anode voltage when receiving a first control signal;
the second light-emitting control module is connected with the drain electrode of the driving transistor, connected with the anode of the light-emitting module and used for controlling the drain electrode of the driving transistor to be communicated with the anode of the light-emitting module when receiving a second control signal;
when the first light-emitting control module does not receive the first control signal and the second light-emitting control module receives the second control signal, the light-emitting module is in a pre-light-emitting stage;
the first light-emitting control module receives a first control signal, and when the second light-emitting control module receives a second control signal, the light-emitting module is in a light-emitting stage;
wherein the pre-lighting phase occurs after a phase of initializing an anode voltage of the light emitting module and before a lighting phase of the light emitting module.
2. An AMOLED display driver circuit as claimed in claim 1, wherein the memory module is a capacitor, a first terminal of the capacitor is connected to the gate of the driving transistor, and a second terminal of the capacitor is connected to the anode voltage.
3. An AMOLED display driver circuit as recited in claim 2, wherein the first initialization module comprises:
and the first grid electrode and the second grid electrode of the initialization double-grid transistor are both connected with a first scanning signal end, the source electrode of the initialization double-grid transistor is connected with initialization voltage, and the drain electrode of the initialization double-grid transistor is connected with the first end of the capacitor.
4. An AMOLED display driver circuit as claimed in claim 3, wherein the data writing module includes:
and the source electrode of the data writing transistor is connected with a data signal end, the drain electrode of the data writing transistor is connected with the source electrode of the driving transistor, and the grid electrode of the data writing transistor is connected with a second scanning signal end.
5. An AMOLED display driving circuit as claimed in claim 4, further comprising a compensation module connected to the driving transistor for compensating the threshold voltage of the driving transistor, the compensation module comprising:
and the first grid electrode and the second grid electrode of the double-grid compensation transistor are both connected with the second scanning signal end, the source electrode of the double-grid compensation transistor is connected with the grid electrode of the driving transistor, and the drain electrode of the double-grid compensation transistor is connected with the drain electrode of the driving transistor.
6. An AMOLED display driving circuit as claimed in claim 5, wherein the second initialization module comprises an initialization transistor, a gate of the initialization transistor is connected to the third scan signal terminal, a source of the initialization transistor is connected to the initialization voltage, and a drain of the initialization transistor is connected to an anode of the light emitting module.
7. An AMOLED display driving circuit as claimed in claim 6, wherein the first light emission control module comprises a first light emission control transistor, a gate of the first light emission control transistor (T4) is connected to a first control signal terminal, a source of the first light emission control transistor is connected to an anode voltage, and a drain of the first light emission control transistor is connected to a source of the driving transistor.
8. An AMOLED display driving circuit as claimed in claim 6, wherein the second light emission control module comprises a second light emission control transistor, a gate of the second light emission control transistor is connected to a second control signal terminal, a source of the second light emission control transistor is connected to a drain of the driving transistor, and a drain of the second light emission control transistor is connected to an anode of the light emission module.
9. An AMOLED display panel comprising a light emitting module and an AMOLED display driver circuit as claimed in any one of claims 1 to 8.
10. An AMOLED display driving method, using the AMOLED display driving circuit as claimed in any one of claims 1-8, comprising:
a first initialization stage, receiving a first scanning signal, enabling a first initialization module to be conducted, and initializing the storage module;
a data signal writing stage, receiving a second scanning signal, enabling the source electrode of the driving transistor to be connected with a data signal end, and writing a data signal into the driving transistor;
a second initialization stage, receiving a third scanning signal, turning on a second initialization module, and initializing the anode of the light emitting module;
a pre-lighting stage, receiving a second control signal to make the drain electrode of the driving transistor and the anode of the lighting module conducted;
and in the light emitting stage, a first control signal and a second control signal are received at the same time, so that the source electrode of the driving transistor is conducted with the anode voltage, the drain electrode of the driving transistor is conducted with the anode of the light emitting module, and the driving transistor generates a driving current to enable the light emitting module to emit light.
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| CN202211441669.5A CN115762414B (en) | 2022-11-17 | 2022-11-17 | AMOLED display driving circuit, display panel and display driving method |
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| US20080170011A1 (en) * | 2007-01-12 | 2008-07-17 | Hitachi Displays, Ltd. | Image display apparatus |
| US20090207160A1 (en) * | 2008-02-15 | 2009-08-20 | Casio Computer Co., Ltd. | Display drive apparatus, display apparatus and drive control method thereof |
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| WO2016050021A1 (en) * | 2014-09-30 | 2016-04-07 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method therefor, pixel unit, and display apparatus |
| CN114694573A (en) * | 2020-12-28 | 2022-07-01 | 上海和辉光电股份有限公司 | Pixel driving circuit and display device |
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|---|---|---|---|---|
| US20080170011A1 (en) * | 2007-01-12 | 2008-07-17 | Hitachi Displays, Ltd. | Image display apparatus |
| US20090207160A1 (en) * | 2008-02-15 | 2009-08-20 | Casio Computer Co., Ltd. | Display drive apparatus, display apparatus and drive control method thereof |
| CN103295540A (en) * | 2012-06-07 | 2013-09-11 | 上海天马微电子有限公司 | Driving method and driving device of active matrix display panel and display |
| WO2016050021A1 (en) * | 2014-09-30 | 2016-04-07 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method therefor, pixel unit, and display apparatus |
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