CN114141195A - Light emitting device driving circuit, display panel and driving method thereof - Google Patents
Light emitting device driving circuit, display panel and driving method thereof Download PDFInfo
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- CN114141195A CN114141195A CN202111506576.1A CN202111506576A CN114141195A CN 114141195 A CN114141195 A CN 114141195A CN 202111506576 A CN202111506576 A CN 202111506576A CN 114141195 A CN114141195 A CN 114141195A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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Abstract
The light emitting device driving circuit, the display panel and the driving method thereof adopt three scanning signals and three data signals to carry out high-order refreshing on the electric potential of the first node. The scanning method comprises the steps that a frame period is divided into a plurality of subframes, and a first scanning signal, a second scanning signal and a third scanning line number are adopted to alternately scan the subframes, so that the requirement that the nth frame finishes row refreshing before the (N + 3) th frame comes is met, scanning can be finished by the scanning signals without higher scanning signals, and the frequency requirement on the scanning signals is further reduced.
Description
Technical Field
The application relates to the technical field of display, in particular to a light-emitting device driving circuit, a display panel and a driving method of the light-emitting device driving circuit.
Background
At present, Pulse Width Modulation (PWM) driving has become one of the potential solutions to the problem of low gray scale display quality of the mini-leds.
Among them, when driving the mini led in the PWM mode based on the thin film transistor, the scanning frequency requirement is high. Specifically, when the pixel circuit supplies the scan signal, the nth frame must be refreshed before the next frame, N +1, comes, i.e., the duration of scanning all rows must be less than the duration of the first sub-frame. Therefore, the scanning signal needs to have a higher scanning speed, and the frequency requirement of the scanning signal is higher.
Therefore, how to reduce the frequency requirement of the scanning signal is a difficult problem for the manufacturers of the existing panels to try to overcome.
Disclosure of Invention
An object of the embodiments of the present application is to provide a light emitting device driving circuit, a display panel and a driving method thereof, which can solve the technical problem in the prior art that the requirement for the frequency of a scanning signal is high.
The embodiment of the present application provides a light emitting device driving circuit, including:
the grid electrode of the driving transistor is electrically connected to a first node, the source electrode of the driving transistor is electrically connected to a first power supply, and the drain electrode of the driving transistor is electrically connected to a second node;
the anode of the light-emitting device is electrically connected to the second node, and the cathode of the light-emitting device is electrically connected to a second power supply;
a capacitor, a first end of which is electrically connected to the first node, and a second end of which is electrically connected to the second node; and
the write-in module is accessed to a plurality of data signals and a plurality of scanning signals and is electrically connected to the first node, the plurality of data signals and the plurality of scanning signals are in one-to-one correspondence, and the write-in module is used for transmitting the data signals to the first node under the control of the scanning signals.
In the light emitting device driving circuit according to the embodiment of the present application, the writing module includes a first writing transistor, a second writing transistor, and a third writing transistor; wherein the content of the first and second substances,
the grid electrode of the first writing transistor is connected with a first scanning signal, the source electrode of the first writing transistor is connected with a first data signal, and the drain electrode of the first writing transistor is electrically connected with the first node; the grid electrode of the second writing transistor is connected with a second scanning signal, the source electrode of the second writing transistor is connected with a second data signal, and the drain electrode of the second writing transistor is electrically connected with the first node; the gate of the third write transistor is connected to a third scanning signal, the source of the third write transistor is connected to a third data signal, and the drain of the third write transistor is electrically connected to the first node.
In the light emitting device driving circuit according to the embodiment of the present application, the light emitting devices emit light in the first sub-frame group, the second sub-frame group, and the third sub-frame group in one frame period; wherein the content of the first and second substances,
the first subframe group, the second subframe group and the third subframe group comprise a plurality of subframes, and the time lengths of the subframes are different; and the subframes include a first subframe, a second subframe, a third subframe, a fourth subframe, a fifth subframe, and a sixth subframe.
In the light emitting device driving circuit according to the embodiment of the present application, the time length of the sub-frame gradually increases in the first sub-frame group, the time length of the sub-frame gradually increases in the second sub-frame group, and the time length of the sub-frame gradually increases in the third sub-frame group.
In the light emitting device driving circuit according to the embodiment of the present application, the first sub-frame group includes the first sub-frame and the fourth sub-frame, the second sub-frame group includes the second sub-frame and the fifth sub-frame, and the third sub-frame group includes the third sub-frame and the sixth sub-frame; wherein the content of the first and second substances,
in the first subframe group, the durations of the first subframe and the fourth subframe gradually increase, in the second subframe group, the durations of the second subframe and the fifth subframe gradually increase, and in the third subframe group, the durations of the third subframe and the sixth subframe gradually increase.
In the light emitting device driving circuit according to the embodiment of the present application, a time length ratio between the first sub-frame, the second sub-frame, the third sub-frame, the fourth sub-frame, the fifth sub-frame, and the sixth sub-frame is 1: 2: 4: 8: 16: 32.
in the light emitting device driving circuit according to the embodiment of the present application, the time length of the sub-frame gradually increases in the first sub-frame group, the time length of the sub-frame gradually decreases in the second sub-frame group, and the time length of the sub-frame gradually increases in the third sub-frame group.
In the light emitting device driving circuit according to the embodiment of the present application, the first sub-frame group includes the first sub-frame and the fourth sub-frame, the second sub-frame group includes the second sub-frame and the fifth sub-frame, and the third sub-frame group includes the third sub-frame and the sixth sub-frame; wherein the content of the first and second substances,
in the first subframe group, the durations of the first subframe and the fourth subframe gradually increase, in the second subframe group, the durations of the second subframe and the fifth subframe gradually decrease, and in the third subframe group, the durations of the third subframe and the sixth subframe gradually increase.
In the light emitting device driving circuit according to the embodiment of the present application, a time length ratio between the first sub-frame, the second sub-frame, the third sub-frame, the fourth sub-frame, the fifth sub-frame, and the sixth sub-frame is 1: 32: 2: 4: 16: 8.
in the light emitting device driving circuit according to the embodiment of the present application, the sub-frames further include a seventh sub-frame and an eighth sub-frame, the first sub-frame group includes the first sub-frame, the fourth sub-frame and the seventh sub-frame, the second sub-frame group includes the third sub-frame and the sixth sub-frame, and the third sub-frame group includes the second sub-frame, the fifth sub-frame and the eighth sub-frame; wherein the content of the first and second substances,
in the light emitting device driving circuit according to the embodiment of the present application, in the first subframe group, the durations of the first, fourth, and seventh subframes gradually increase, in the second subframe group, the durations of the third and sixth subframes gradually decrease, and in the third subframe group, the durations of the second, fifth, and eighth subframes gradually increase.
In the light emitting device driving circuit according to the embodiment of the present application, a time length ratio between the first sub-frame, the second sub-frame, the third sub-frame, the fourth sub-frame, the fifth sub-frame, the sixth sub-frame, the seventh sub-frame, and the eighth sub-frame is 1: 2: 45: 4: 8: 36: 16: 32.
the embodiment of the present application further provides a display panel, where the display panel includes a plurality of pixel units arranged in an array, and each of the pixel units includes the light emitting device driving circuit.
The embodiment of the present application further provides a driving method of a display panel, where the driving method includes:
dividing a frame period into a plurality of subframes;
and scanning a plurality of sub-frames alternately by adopting a first scanning signal, a second scanning signal and a third scanning signal.
In the driving method of the display panel according to the embodiment of the present application, the one frame period includes a first sub-frame, a second sub-frame, a third sub-frame, a fourth sub-frame, a fifth sub-frame, and a sixth sub-frame; scanning by adopting the first scanning signal when the first sub-frame and the fourth sub-frame; scanning by using the second scanning signal when the second subframe and the fifth subframe are performed; and scanning by using the third scanning signal when the third subframe and the sixth subframe are used.
In the driving method of the display panel according to the embodiment of the present application, the one frame period further includes a seventh sub-frame and an eighth sub-frame; scanning by adopting the first scanning signal when the seventh subframe is started; and scanning by using the second scanning signal in the eighth subframe.
In the light emitting device driving circuit, the display panel and the driving method thereof provided by the embodiment of the application, three scanning signals are adopted to match with three data signals, and the potential of the first node is subjected to high-level refreshing. The scanning method comprises the steps that a frame period is divided into a plurality of subframes, and a first scanning signal, a second scanning signal and a third scanning line number are adopted to alternately scan the subframes, so that the requirement that the nth frame finishes row refreshing before the (N + 3) th frame comes is met, scanning can be finished by the scanning signals without higher scanning signals, and the frequency requirement on the scanning signals is further reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a light emitting device driving circuit provided in an embodiment of the present application.
Fig. 2 is a circuit schematic diagram of a light emitting device driving circuit provided in an embodiment of the present application.
Fig. 3 is a schematic diagram of a sub-frame time ratio of a conventional light emitting device driving circuit.
Fig. 4 is a schematic diagram of a sub-frame time ratio of a first embodiment of a light emitting device driving circuit provided in an example of the present application.
Fig. 5 is a schematic diagram of a sub-frame time ratio of a second embodiment of a light emitting device driving circuit according to an example of the present application.
Fig. 6 is a schematic diagram of a sub-frame time ratio of a third embodiment of a light emitting device driving circuit according to an example of the present application.
Fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present application.
Fig. 8 is a flowchart illustrating a driving method of a display panel according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The transistors used in all embodiments of the present application may be thin film transistors or field effect transistors or other devices with the same characteristics, and since the source and drain of the transistors used herein are symmetrical, the source and drain may be interchanged. In the embodiment of the present application, to distinguish two poles of a transistor except for a gate, one of the two poles is referred to as a source, and the other pole is referred to as a drain. The form in the drawing provides that the middle end of the switching transistor is a grid, the signal input end is a source, and the output end is a drain. In addition, the transistors used in the embodiments of the present application are N-type transistors, wherein the N-type transistors are turned on when the gates are at a high level and turned off when the gates are at a low level.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a light emitting device driving circuit according to an embodiment of the present disclosure. As shown in fig. 1, the light emitting device driving circuit 10 provided in the embodiment of the present application includes a light emitting device D, a driving transistor T1, a writing block 101, and a capacitor C. It should be noted that the light emitting device D may be a mini light emitting diode, a micro light emitting diode or an organic light emitting diode.
The anode of the light emitting device D is electrically connected to the second node S, and the cathode of the light emitting device D is electrically connected to the second power source VSS. The gate of the driving transistor T1 is electrically connected to the first node G, the source of the driving transistor T1 is electrically connected to the first power source VDD, and the drain of the driving transistor T1 is electrically connected to the second node S. The write module 101 accesses a plurality of data signals and a scan signal. The plurality of data signals and the plurality of scan signals correspond one-to-one. Specifically, the write module 101 accesses the first scan signal scan1, the second scan signal scan2, the third scan signal scan3, the first data signal data1, the second data signal data2 and the third data signal data 3. The first scan signal scan1 corresponds to the first data signal data1, the second scan signal scan2 corresponds to the second data signal data2, and the third scan signal scan3 corresponds to the third data signal data 3. The write module 101 is electrically connected to the first node G. One end of the capacitor C is electrically connected to the first node G. The other end of the capacitor C is electrically connected to the second node S
It should be noted that, in the embodiment of the present application, it is only necessary to ensure that the light emitting device D is connected in series to the light emitting loop formed by the first power supply VDD and the second power supply VSS, and the light emitting device driving circuit 10 shown in fig. 1 only illustrates one specific position of the light emitting device D. That is, the light emitting device D may be connected in series at any position on the light emitting loop.
Specifically, the driving transistor T1 is used to control the current flowing through the light emitting loop. The write module 101 is configured to transmit a data signal to the first node G under the control of a scan signal. Specifically, the write module 101 is configured to transfer the first data signal data1 to the first node G under the control of the first scan signal scan1, to transfer the second data signal data2 to the first node G under the control of the second scan signal scan2, and to transfer the third data signal data3 to the first node G under the control of the third scan signal scan 3.
Referring to fig. 2, fig. 2 is a circuit schematic diagram of a light emitting device driving circuit according to an embodiment of the present disclosure. Referring to fig. 1 and 2, the write module 101 includes a first write transistor T2, a second write transistor T3, and a third write transistor T4.
The gate of the first write transistor T2 is connected to the first scan signal scan1, the source of the first write transistor T2 is connected to the first data signal data1, and the drain of the first write transistor T2 is electrically connected to the first node G. The gate of the second write transistor T3 is connected to the second scan signal scan2, the source of the second write transistor T3 is connected to the second data signal data2, and the drain of the second write transistor T3 is electrically connected to the first node G. The gate of the third write transistor T4 is connected to the third scan signal scan3, the source of the third write transistor T4 is connected to the third data signal data3, and the drain of the third write transistor T4 is electrically connected to the first node G.
It should be noted that the first power source VDD and the second power source VSS are both used for outputting a predetermined voltage value. In addition, in the embodiment of the present application, the potential of the first power supply VDD is greater than the potential of the second power supply VSS. Specifically, the potential of the second power supply VSS may be the potential of the ground terminal. Of course, it is understood that the potential of the second power supply VSS may be other.
It should be noted that the driving transistor T1, the first writing transistor T2, the second writing transistor T3 and the third writing transistor T4 may be one or more of a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor or an amorphous silicon thin film transistor. Further, the transistors in the light emitting device driving circuit 10 provided in the embodiment of the present application may be set to be the same type of transistors, so as to avoid the influence on the light emitting device driving circuit 10 caused by the difference between different types of transistors.
Referring to fig. 3, fig. 3 is a schematic diagram of a sub-frame time ratio of a conventional light emitting device driving circuit. As shown in fig. 3, the conventional light emitting device driving circuit divides one frame period into 6 sub-frames, and specifically, the one frame period includes a first sub-frame a1, a second sub-frame a2, a third sub-frame A3, a fourth sub-frame a4, a fifth sub-frame a5, and a sixth sub-frame a 6. The first subframe a1, the second subframe a2, the third subframe A3, the fourth subframe a4, the fifth subframe a5 and the sixth subframe a6 are of different durations.
The display time length ratio among the first sub-frame A1, the second sub-frame A2, the third sub-frame A3, the fourth sub-frame A4, the fifth sub-frame A5 and the sixth sub-frame A6 is 1: 2: 4: 8: 16: 32. the existing light emitting device driving circuit is 6-bit gray scale display. The conventional light emitting device driving circuit can realize 63-level gray scale display.
Among them, the conventional light emitting device driving circuit performs scanning using one scanning signal. It should be noted that, since the conventional light emitting device driving circuit only uses one scanning signal for scanning, the nth frame must be refreshed before the next frame N +1 comes. Since the relative duration of the first sub-frame a1 is the lowest, the duration for scanning all rows must be less than the duration of the first sub-frame a 1. The formula described below is a calculation formula of a time period for which the scanning signal scans all the rows.
Hsync is the specific time length for scanning all the rows by the scanning signal, t is the relative time length for scanning all the rows, f is the frame frequency of the light emitting device driving circuit, Gray is the Gray level which can be realized by the light emitting device driving circuit, and FHD is the number of rows to be scanned by the scanning signal.
From the above formula, in the conventional light emitting device driving circuit, if f is 120HZ and FHD is 1080 lines, the scanning signal needs to be in
The scanning is completed, i.e. the scanning signal needs to complete the scanning in 0.12 microseconds.
Referring to fig. 3 and 4, fig. 4 is a schematic diagram of a time ratio driving circuit of a first embodiment of a light emitting device driving circuit according to an embodiment of the present disclosure. As shown in fig. 4, the light emitting device driving circuit provided in the embodiment divides one frame period into 6 sub-frames, and specifically, the one frame period includes a first sub-frame a1, a second sub-frame a2, a third sub-frame A3, a fourth sub-frame a4, a fifth sub-frame a5, and a sixth sub-frame a 6. The first subframe a1, the second subframe a2, the third subframe A3, the fourth subframe a4, the fifth subframe a5 and the sixth subframe a6 are of different durations. The light emitting device D emits light in the first sub-frame group, the second sub-frame group, and the third sub-frame group. The duration of the subframes is gradually increased in the first subframe group, the duration of the subframes is gradually increased in the second subframe group, and the duration of the subframes is gradually increased in the third subframe group.
The first subframe group includes a first subframe A1 and a fourth subframe A4. The second subframe group includes a second subframe a2 and a fifth subframe a 5. The third subframe group includes a third subframe A3 and a sixth subframe a 6. In the first subframe group, the durations of the first subframe a1 and the fourth subframe a4 are gradually increased. In the second subframe group, the duration of the second subframe a2 and the fifth subframe a5 gradually increases. In the third subframe group, the durations of the third subframe A3 and the sixth subframe a6 are gradually increased. Specifically, the display duration ratio between the first sub-frame a1, the second sub-frame a2, the third sub-frame A3, the fourth sub-frame a4, the fifth sub-frame a5, and the sixth sub-frame a6 is 1: 2: 4: 8: 16: 32. the light-emitting device driving circuit provided by the embodiment of the application is used for 6-bit gray scale display. The light-emitting device driving circuit provided by the embodiment of the application can realize 63-level gray scale display.
The light emitting device driving circuit provided by the embodiment of the application adopts three scanning signals to scan alternately. Specifically, the first sub-frame a1 and the fourth sub-frame a4 are scanned by a first scan signal scan 1; the second sub-frame a2 and the fifth sub-frame a5 are scanned by the second scan signal scan2, and the third sub-frame A3 and the sixth sub-frame a6 are scanned by the third scan signal scan 3. Therefore, the nth frame has to complete the row refresh before the next frame N +3 comes, and since the sum of the durations of the first sub-frame a1, the second sub-frame a2 and the third sub-frame A3 is the smallest among the durations of the adjacent three sub-frames, the duration of scanning all rows has to be smaller than the sum of the durations of the first sub-frame a1, the second sub-frame a2 and the third sub-frame A3.
In the driving method of the light emitting device driving circuit provided in the embodiment of the present application, taking behavior example of f being 120HZ and FHD being 1080, the scan signal needs to be in
The scan is completed, i.e. the scan signal needs to complete the scan within 0.86 microseconds.
Therefore, the light emitting device driving circuit provided in the embodiment of the present application uses the first scan signal scan1, the second scan signal scan2, and the third scan signal scan3 to scan alternately, so as to greatly increase the time for scanning all the rows by the scan signals, thereby reducing the frequency required by the scan signals.
Referring to fig. 3 and 5, fig. 5 is a schematic diagram of a sub-frame time ratio of a light emitting device driving circuit according to a second embodiment of the present disclosure. As shown in fig. 5, the light emitting device driving circuit provided in the embodiment divides one frame period into 6 sub-frames, and specifically, the one frame period includes a first sub-frame a1, a second sub-frame a2, a third sub-frame A3, a fourth sub-frame a4, a fifth sub-frame a5, and a sixth sub-frame a 6. The first subframe a1, the second subframe a2, the third subframe A3, the fourth subframe a4, the fifth subframe a5 and the sixth subframe a6 are of different durations. The light emitting device D emits light in the first sub-frame group, the second sub-frame group, and the third sub-frame group. In the first subframe group, the duration of the subframes gradually increases, in the second subframe group, the duration of the subframes gradually decreases, and in the third subframe group, the duration of the subframes gradually increases.
The first subframe group includes a first subframe A1 and a fourth subframe A4. The second subframe group includes a second subframe a2 and a fifth subframe a 5. The third subframe group includes a third subframe A3 and a sixth subframe a 6. In the first subframe group, the durations of the first subframe a1 and the fourth subframe a4 are gradually increased. In the second subframe group, the durations of the second subframe a2 and the fifth subframe a5 are gradually decreased. In the third subframe group, the durations of the third subframe A3 and the sixth subframe a6 are gradually increased. Specifically, the display duration ratio between the first sub-frame a1, the second sub-frame a2, the third sub-frame A3, the fourth sub-frame a4, the fifth sub-frame a5, and the sixth sub-frame a6 is 1: 32: 2: 4: 16: 8. the light-emitting device driving circuit provided by the embodiment of the application is used for 6-bit gray scale display. The light-emitting device driving circuit provided by the embodiment of the application can realize 63-level gray scale display.
The light emitting device driving circuit provided by the embodiment of the application adopts three scanning signals to scan alternately. Specifically, the first sub-frame a1 and the fourth sub-frame a4 are scanned by a first scan signal scan 1; the second sub-frame a2 and the fifth sub-frame a5 are scanned by the second scan signal scan2, and the third sub-frame A3 and the sixth sub-frame a6 are scanned by the third scan signal scan 3. Therefore, the nth frame has to complete the row refresh before the next frame N +3 comes, and since the sum of the durations of the third sub-frame A3, the fourth sub-frame a4 and the fifth sub-frame a5 is the smallest among the durations of the adjacent three sub-frames, the duration of scanning all rows must be less than the sum of the durations of the third sub-frame A3, the fourth sub-frame a4 and the fifth sub-frame a 5.
In the light emitting device driving circuit provided in the embodiment of the present application, if f is 120HZ and FHD is 1080, the scanning signal needs to be in
The scanning is completed, i.e. the scanning signal needs to complete the scanning within 2.7 microseconds.
Therefore, the light emitting device driving circuit provided in the embodiment of the present application uses the first scan signal scan1, the second scan signal scan2, and the third scan signal scan3 to scan alternately, so as to increase the time for scanning all the rows by the scan signals, thereby reducing the frequency required by the scan signals. In addition, the light emitting device driving circuit provided by the embodiment of the application adjusts the relative duration of different sub-frames, so that the time for scanning all rows by scanning signals is greatly prolonged, and the frequency required by the scanning signals is reduced to a greater extent.
Referring to fig. 3 and fig. 6, fig. 6 is a schematic time ratio driving diagram of a driving method of a light emitting device driving circuit according to a third embodiment of the present disclosure. The light emitting device driving circuit provided by the embodiment of the application divides one frame period into 8 subframes, and specifically, the one frame period includes a first subframe a1, a second subframe a2, a third subframe A3, a fourth subframe a4, a fifth subframe a5, a sixth subframe a6, a seventh subframe a7 and an eighth subframe A8. The first subframe a1, the second subframe a2, the third subframe A3, the fourth subframe a4, the fifth subframe a5, the sixth subframe a6, the seventh subframe a7, and the eighth subframe A8 are of different durations. The light emitting device D emits light in the first sub-frame group, the second sub-frame group, and the third sub-frame group. In the first subframe group, the duration of the subframes gradually increases, in the second subframe group, the duration of the subframes gradually decreases, and in the third subframe group, the duration of the subframes gradually increases.
Wherein the first subframe group includes a first subframe a1, a fourth subframe a4, and a seventh subframe a 7. The second subframe group includes a third subframe A3 and a sixth subframe a 6. The third subframe group includes a second subframe a2, a fifth subframe a5, and an eighth subframe A8. In the first subframe group, the durations of the first subframe a1, the fourth subframe a4, and the seventh subframe a7 gradually increase. In the second subframe group, the durations of the third subframe A3 and the sixth subframe a6 are gradually decreased. In the third subframe group, the durations of the second subframe a2, the fifth subframe a5, and the eighth subframe A8 are gradually increased. Specifically, the display duration ratio between the first sub-frame a1, the second sub-frame a2, the third sub-frame A3, the fourth sub-frame a4, the fifth sub-frame a5, the sixth sub-frame a6, the seventh sub-frame a7, and the eighth sub-frame A8 is 1: 2: 45: 4: 8: 36: 16: 32.
the light emitting device driving circuit provided by the embodiment of the application still displays 6-bit gray scale level. The seventh sub-frame a7 and the eighth sub-frame A8 are compensation sub-frames, and the light emitting device driving circuit provided by the embodiment of the present application can realize 144-level gray scale display by arranging the seventh sub-frame a7 and the eighth sub-frame A8.
The light emitting device driving circuit provided by the embodiment of the application adopts three scanning signals to scan alternately. Specifically, the first sub-frame a1, the fourth sub-frame a4, and the seventh sub-frame a7 are scanned with a first scan signal scan 1; the second sub-frame a2, the fifth sub-frame a5 and the eighth sub-frame A8 are scanned with the second scan signal scan2, and the third sub-frame A3 and the sixth sub-frame a6 are scanned with the third scan signal scan 3. Therefore, the nth frame has to complete the row refresh before the next frame N +3 comes, and since the sum of the durations of the first sub-frame a1, the second sub-frame a2 and the third sub-frame A3 is the smallest among the durations of the adjacent three sub-frames, the duration of scanning all rows must be less than the sum of the durations of the first sub-frame a1, the second sub-frame a2 and the third sub-frame A3.
In the light emitting device driving circuit provided in the embodiment of the present application, if f is 120HZ and FHD is 1080, the scanning signal needs to be in
Complete scanning, i.e. the scanning signal needs to complete scanning within 2.6 microseconds.
Therefore, the light emitting device driving circuit provided in the embodiment of the present application uses the first scan signal scan1, the second scan signal scan2, and the third scan signal scan3 to scan alternately, so as to increase the time for scanning all the rows by the scan signals, thereby reducing the frequency required by the scan signals. In addition, the light emitting device driving circuit provided by the embodiment of the application is additionally provided with two supplementary subframes, so that the gray level which can be realized by the light emitting device driving circuit provided by the embodiment of the application is improved.
The embodiment of the application can also improve the time for scanning all rows by the scanning signals by adjusting the relative duration of different subframes, and reduce the frequency required by the scanning signals to a greater extent.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure. As shown in fig. 7, the display panel 200 provided in the embodiment of the present application includes a plurality of pixel units 2000 arranged in an array, each pixel unit 2000 includes the light emitting device driving circuit 10 described above, and specific reference may be made to the description of the light emitting device driving circuit 10, which is not repeated herein.
Referring to fig. 8, fig. 8 is a schematic flow chart of a driving method of a display panel according to an embodiment of the present disclosure, and as shown in fig. 8, the driving method of the display panel according to the embodiment of the present disclosure includes the following steps:
It should be noted that, in order to realize a display with a higher gray scale, one frame period needs to be divided into a plurality of subframes.
It should be noted that the first scanning signal, the second scanning signal and the third scanning line number are used to scan a plurality of subframes alternately, so that the nth frame is only required to be refreshed before the (N + 3) th frame comes, and thus the scanning signal can be scanned without a higher scanning signal, and the frequency requirement on the scanning signal is reduced.
In the light emitting device driving circuit, the display panel and the driving method thereof provided by the embodiment of the application, three scanning signals are adopted to match with three data signals, and the potential of the first node is subjected to high-level refreshing. The scanning method comprises the steps that a frame period is divided into a plurality of subframes, and a first scanning signal, a second scanning signal and a third scanning line number are adopted to alternately scan the subframes, so that the requirement that the nth frame finishes row refreshing before the (N + 3) th frame comes is met, scanning can be finished by the scanning signals without higher scanning signals, and the frequency requirement on the scanning signals is further reduced.
The foregoing describes in detail a light emitting device driving circuit, a display panel and a driving method thereof provided in the embodiments of the present application, and the principles and embodiments of the present application are described herein by applying specific examples, and the description of the foregoing embodiments is only used to help understanding the method and the core concept of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (15)
1. A light emitting device driving circuit, comprising:
the grid electrode of the driving transistor is electrically connected to a first node, the source electrode of the driving transistor is electrically connected to a first power supply, and the drain electrode of the driving transistor is electrically connected to a second node;
the anode of the light-emitting device is electrically connected to the second node, and the cathode of the light-emitting device is electrically connected to a second power supply;
a capacitor, a first end of which is electrically connected to the first node, and a second end of which is electrically connected to the second node; and
the write-in module is accessed to a plurality of data signals and a plurality of scanning signals and is electrically connected to the first node, the plurality of data signals and the plurality of scanning signals are in one-to-one correspondence, and the write-in module is used for transmitting the data signals to the first node under the control of the scanning signals.
2. The light emitting device driving circuit according to claim 1, wherein the writing module includes a first writing transistor, a second writing transistor, and a third writing transistor; wherein the content of the first and second substances,
the grid electrode of the first writing transistor is connected with a first scanning signal, the source electrode of the first writing transistor is connected with a first data signal, and the drain electrode of the first writing transistor is electrically connected with the first node; the grid electrode of the second writing transistor is connected with a second scanning signal, the source electrode of the second writing transistor is connected with a second data signal, and the drain electrode of the second writing transistor is electrically connected with the first node; the gate of the third write transistor is connected to a third scanning signal, the source of the third write transistor is connected to a third data signal, and the drain of the third write transistor is electrically connected to the first node.
3. The light-emitting device driving circuit according to claim 2, wherein the light-emitting device emits light in a first sub-frame group, a second sub-frame group, and a third sub-frame group in one frame period; wherein the content of the first and second substances,
the first subframe group, the second subframe group and the third subframe group comprise a plurality of subframes, and the time lengths of the subframes are different; and the subframes include a first subframe, a second subframe, a third subframe, a fourth subframe, a fifth subframe, and a sixth subframe.
4. The light emitting device driving circuit according to claim 3, wherein the sub-frames are gradually increased in duration in the first sub-frame group, gradually increased in duration in the second sub-frame group, and gradually increased in duration in the third sub-frame group.
5. The light-emitting device driving circuit according to claim 4, wherein the first sub-frame group includes the first sub-frame and the fourth sub-frame, wherein the second sub-frame group includes the second sub-frame and the fifth sub-frame, and wherein the third sub-frame group includes the third sub-frame and the sixth sub-frame; wherein the content of the first and second substances,
in the first subframe group, the durations of the first subframe and the fourth subframe gradually increase, in the second subframe group, the durations of the second subframe and the fifth subframe gradually increase, and in the third subframe group, the durations of the third subframe and the sixth subframe gradually increase.
6. The light-emitting device driving circuit according to claim 5, wherein a time length ratio between the first sub-frame, the second sub-frame, the third sub-frame, the fourth sub-frame, the fifth sub-frame, and the sixth sub-frame is 1: 2: 4: 8: 16: 32.
7. the light emitting device driving circuit according to claim 3, wherein the sub-frames have a duration that gradually increases in the first sub-frame group, gradually decreases in the second sub-frame group, and gradually increases in the third sub-frame group.
8. The light-emitting device driving circuit according to claim 7, wherein the first sub-frame group includes the first sub-frame and the fourth sub-frame, wherein the second sub-frame group includes the second sub-frame and the fifth sub-frame, and wherein the third sub-frame group includes the third sub-frame and the sixth sub-frame; wherein the content of the first and second substances,
in the first subframe group, the durations of the first subframe and the fourth subframe gradually increase, in the second subframe group, the durations of the second subframe and the fifth subframe gradually decrease, and in the third subframe group, the durations of the third subframe and the sixth subframe gradually increase.
9. The light-emitting device driving circuit according to claim 8, wherein a ratio of time lengths between the first sub-frame, the second sub-frame, the third sub-frame, the fourth sub-frame, the fifth sub-frame, and the sixth sub-frame is 1: 32: 2: 4: 16: 8.
10. the light-emitting device driving circuit according to claim 7, wherein the sub-frames further include a seventh sub-frame and an eighth sub-frame, wherein the first sub-frame group includes the first sub-frame, the fourth sub-frame, and the seventh sub-frame, wherein the second sub-frame group includes the third sub-frame and the sixth sub-frame, and wherein the third sub-frame group includes the second sub-frame, the fifth sub-frame, and the eighth sub-frame; wherein the content of the first and second substances,
in the first subframe group, the durations of the first, fourth, and seventh subframes gradually increase, in the second subframe group, the durations of the third and sixth subframes gradually decrease, and in the third subframe group, the durations of the second, fifth, and eighth subframes gradually increase.
11. The light-emitting device driving circuit according to claim 10, wherein a ratio of time lengths between the first sub-frame, the second sub-frame, the third sub-frame, the fourth sub-frame, the fifth sub-frame, the sixth sub-frame, the seventh sub-frame, and the eighth sub-frame is 1: 2: 45: 4: 8: 36: 16: 32.
12. a display panel comprising a plurality of pixel units arranged in an array, each of the pixel units comprising the light emitting device driving circuit according to any one of claims 1 to 11.
13. A driving method of a display panel, the driving method comprising:
dividing a frame period into a plurality of subframes;
and scanning a plurality of sub-frames alternately by adopting a first scanning signal, a second scanning signal and a third scanning signal.
14. The method of driving a display panel according to claim 13, wherein the one frame period includes a first sub-frame, a second sub-frame, a third sub-frame, a fourth sub-frame, a fifth sub-frame, and a sixth sub-frame; scanning by adopting the first scanning signal when the first sub-frame and the fourth sub-frame; scanning by using the second scanning signal when the second subframe and the fifth subframe are performed; and scanning by using the third scanning signal when the third subframe and the sixth subframe are used.
15. The method for driving a display panel according to claim 14, wherein the one frame period further includes a seventh sub-frame and an eighth sub-frame; scanning by adopting the first scanning signal when the seventh subframe is started; and scanning by using the second scanning signal in the eighth subframe.
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