CN114141195B - 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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- 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
According to the light-emitting device driving circuit, the display panel and the driving method thereof, three scanning signals are matched with three data signals, and high-order refreshing is conducted on the potential of the first node. The frame period is divided into a plurality of subframes, and the first scanning signal, the second scanning signal and the third scanning line number are adopted to alternately scan the subframes, so that the N frame is refreshed before the N+3 frame is finished, the scanning signal can finish scanning without higher scanning signal, and the frequency requirement on the scanning signal is 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 thereof.
Background
Currently, pulse width modulation (Pulse Width Modulation, PWM) driving has become one of the potential solutions for solving the problem of low gray scale display quality of mini light emitting diodes.
Wherein, when the mini light emitting diode is driven in a PWM mode based on the thin film transistor, the scanning frequency requirement is high. Specifically, when the pixel circuit supplies the scanning signal, the nth frame must complete the row refresh just before the next frame n+1, i.e., the duration of scanning all the rows must be less than the duration of the first subframe. Therefore, the scanning signal needs to have a high scanning speed, and the frequency of the scanning signal is high.
Therefore, how to reduce the frequency requirement of the scan signal is a difficult task for the existing panel manufacturer to overcome.
Disclosure of Invention
An object of the embodiment 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 frequency requirement on scanning signals is high.
An embodiment of the present application provides a light emitting device driving circuit, including:
the grid electrode of the driving transistor is electrically connected to the first node, the source electrode of the driving transistor is electrically connected to the first power supply, and the drain electrode of the driving transistor is electrically connected to the second node;
the anode of the light-emitting device is electrically connected with the second node, and the cathode of the light-emitting device is electrically connected with a second power supply;
the first end of the capacitor is electrically connected with the first node, and the second end of the capacitor is electrically connected with the second node; and
the writing module is connected with a plurality of data signals and a plurality of scanning signals in an accessing mode, and is electrically connected to the first node, the data signals and the scanning signals are in one-to-one correspondence, and the writing module is used for conveying the data signals to the first node under the control of the scanning signals.
In the light emitting device driving circuit described in 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 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 grid electrode of the third writing transistor is connected with a third scanning signal, the source electrode of the third writing transistor is connected with a third data signal, and the drain electrode of the third writing transistor is electrically connected with the first node.
In the light emitting device driving circuit according to the embodiment of the present application, the light emitting device emits light in the first subframe group, the second subframe group, and the third subframe group in one frame period; wherein,,
the first subframe group, the second subframe group and the third subframe group comprise a plurality of subframes, and the duration of the subframes is 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, in the first subframe group, the duration of the subframe gradually increases, in the second subframe group, the duration of the subframe gradually increases, and in the third subframe group, the duration of the subframe gradually increases.
In the light emitting device driving circuit of the embodiment of the present application, the first subframe group includes the first subframe and the fourth subframe, the second subframe group includes the second subframe and the fifth subframe, and the third subframe group includes the third subframe and the sixth subframe; wherein,,
in the first subframe group, the duration of the first subframe and the fourth subframe gradually increase, in the second subframe group, the duration of the second subframe and the fifth subframe gradually increase, and in the third subframe group, the duration of the third subframe and the sixth subframe gradually increase.
In the light emitting device driving circuit of the embodiment of the present application, a duration ratio among the first subframe, the second subframe, the third subframe, the fourth subframe, the fifth subframe, and the sixth subframe is 1:2:4:8:16:32.
in the light emitting device driving circuit according to the embodiment of the present application, in the first subframe group, the duration of the subframe gradually increases, in the second subframe group, the duration of the subframe gradually decreases, and in the third subframe group, the duration of the subframe gradually increases.
In the light emitting device driving circuit of the embodiment of the present application, the first subframe group includes the first subframe and the fourth subframe, the second subframe group includes the second subframe and the fifth subframe, and the third subframe group includes the third subframe and the sixth subframe; wherein,,
in the first subframe group, the duration of the first subframe and the fourth subframe gradually increase, in the second subframe group, the duration of the second subframe and the fifth subframe gradually decrease, and in the third subframe group, the duration of the third subframe and the sixth subframe gradually increase.
In the light emitting device driving circuit of the embodiment of the present application, a duration ratio among the first subframe, the second subframe, the third subframe, the fourth subframe, the fifth subframe, and the sixth subframe is 1:32:2:4:16:8.
in the light emitting device driving circuit of the embodiment of the present application, the subframe further includes a seventh subframe and an eighth subframe, the first subframe group includes the first subframe, the fourth subframe and the seventh subframe, the second subframe group includes the third subframe and the sixth subframe, and the third subframe group includes the second subframe, the fifth subframe and the eighth subframe; wherein,,
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 subframe, the fourth subframe, and the seventh subframe gradually increase, in the second subframe group, the durations of the third subframe and the sixth subframe gradually decrease, and in the third subframe group, the durations of the second subframe, the fifth subframe, and the eighth subframe gradually increase.
In the light emitting device driving circuit of the embodiment of the present application, a ratio of time durations among the first subframe, the second subframe, the third subframe, the fourth subframe, the fifth subframe, the sixth subframe, the seventh subframe, and the eighth subframe is 1:2:45:4:8:36:16:32.
the embodiment of the application also provides a display panel, which comprises a plurality of pixel units arranged in an array, wherein each pixel unit comprises the light-emitting device driving circuit.
The embodiment of the application also provides a driving method of the display panel, which comprises the following steps:
dividing one frame period into a plurality of subframes;
and scanning a plurality of subframes alternately by adopting the first scanning signal, the second scanning signal and the third scanning signal.
In the driving method of a display panel according to the embodiment of the present application, the one frame period includes a first subframe, a second subframe, a third subframe, a fourth subframe, a fifth subframe, and a sixth subframe; scanning by adopting the first scanning signal when the first subframe and the fourth subframe are adopted; scanning with the second scanning signal when the second subframe and the fifth subframe are used; and scanning by adopting the third scanning signal when the third subframe and the sixth subframe are adopted.
In the driving method of a display panel according to the embodiment of the present application, the one frame period further includes a seventh subframe and an eighth subframe; scanning with the first scanning signal at the seventh subframe; and scanning by adopting the second scanning signal at 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 refreshed in a high-order manner. The frame period is divided into a plurality of subframes, and the first scanning signal, the second scanning signal and the third scanning line number are adopted to alternately scan the subframes, so that the N frame is refreshed before the N+3 frame is finished, the scanning signal can finish scanning without higher scanning signal, and the frequency requirement on the scanning signal is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a light emitting device driving circuit according to an embodiment of the present application.
Fig. 2 is a schematic circuit diagram of a light emitting device driving circuit according to an embodiment of the present application.
Fig. 3 is a schematic diagram showing a sub-frame time ratio of a conventional light emitting device driving circuit.
Fig. 4 is a schematic diagram of a subframe time ratio of a first implementation of a light emitting device driving circuit according to an embodiment of the present application.
Fig. 5 is a schematic diagram of a subframe time ratio of a second implementation of a light emitting device driving circuit according to an embodiment of the present application.
Fig. 6 is a schematic diagram of a subframe time ratio of a third implementation of a light emitting device driving circuit according to an embodiment 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 application.
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 will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the 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 the source and drain of the transistors used herein are symmetrical, so that the source and drain may be interchanged. In the embodiment of the present application, to distinguish between two electrodes of the transistor except the gate, one electrode is referred to as a source electrode and the other electrode is referred to as a drain electrode. The middle terminal of the switching transistor is defined as a gate, the signal input terminal is defined as a source, and the output terminal is defined as a drain according to the form in the figure. In addition, the transistor adopted in the embodiment of the present application is an N-type transistor, where the N-type transistor is turned on when the gate is at a high level and turned off when the gate is at a low level.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a driving circuit of a light emitting device according to an embodiment of the present application. 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 module 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 scan signals. The plurality of data signals and the plurality of scan signals are in one-to-one correspondence. Specifically, the writing 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 data3. 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 data3. The writing 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, the light emitting device D is only required to be connected in series to a light emitting circuit 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 a 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 circuit.
Specifically, the driving transistor T1 is used to control the current flowing through the light emitting circuit. The writing module 101 is configured to transmit a data signal to the first node G under control of the scan signal. Specifically, the writing module 101 is configured to transmit the first data signal data1 to the first node G under the control of the first scan signal scan1, transmit the second data signal data2 to the first node G under the control of the second scan signal scan2, and transmit 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 schematic circuit diagram of a driving circuit of a light emitting device according to an embodiment of the present application. As shown in fig. 1 and 2, the writing module 101 includes a first writing transistor T2, a second writing transistor T3, and a third writing transistor T4.
The gate of the first writing transistor T2 is connected to the first scan signal scan1, the source of the first writing transistor T2 is connected to the first data signal data1, and the drain of the first writing transistor T2 is electrically connected to the first node G. The gate of the second writing transistor T3 is connected to the second scan signal scan2, the source of the second writing transistor T3 is connected to the second data signal data2, and the drain of the second writing transistor T3 is electrically connected to the first node G. The gate of the third writing transistor T4 is connected to the third scan signal scan3, the source of the third writing transistor T4 is connected to the third data signal data3, and the drain of the third writing transistor T4 is electrically connected to the first node G.
It should be noted that, the first power supply VDD and the second power supply VSS are both used for outputting a preset voltage value. Further, 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 source VSS may be the potential of the ground terminal. Of course, it is understood that the potential of the second power source VSS may be other.
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, and 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 of the variability between different types of transistors on the light emitting device driving circuit 10.
Referring to fig. 3, fig. 3 is a schematic diagram showing 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 subframes, specifically, one frame period includes a first subframe A1, a second subframe A2, a third subframe A3, a fourth subframe A4, a fifth subframe A5, and a sixth subframe A6. The first, second, third, fourth, fifth and sixth subframes A1, A2, A3, A4, A5 and A6 have different durations.
The display duration ratio among 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 is 1:2:4:8:16:32. the existing light emitting device driving circuit is for 6-bit gray scale display. The existing light emitting device driving circuit can realize 63-level gray scale display.
The existing light emitting device driving circuit uses a scanning signal to scan. Since the conventional light emitting device driving circuit uses only one scanning signal for scanning, the nth frame must be refreshed in line immediately before the next frame n+1. And since the relative duration of the first subframe A1 is the lowest, the duration of scanning all rows must be less than the duration of the first subframe A1. The following formula is a calculation formula of the time length of scanning all the rows by the scanning signal.
Wherein Hsync is the specific time length of scanning all the rows by the scanning signal, t is the relative time length of 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 required to be scanned by the scanning signal.
As can be seen from the above formula, in the conventional light emitting device driving circuit, taking f as 120HZ and FHD as 1080, the scan signal is required to be obtained
The scan is completed, i.e., the scan signal needs to complete the scan in 0.12 microseconds.
Referring to fig. 3 and fig. 4, fig. 4 is a schematic diagram illustrating a time-ratio driving of a first embodiment of a driving circuit of a light emitting device according to an embodiment of the present application. As shown in fig. 4, the light emitting device driving circuit provided in the embodiment of the present application divides one frame period into 6 subframes, specifically, one frame period includes a first subframe A1, a second subframe A2, a third subframe A3, a fourth subframe A4, a fifth subframe A5, and a sixth subframe A6. The first, second, third, fourth, fifth and sixth subframes A1, A2, A3, A4, A5 and A6 have different durations. The light emitting device D emits light in the first, second, and third sub-frame groups. In the first subframe group, the duration of the subframe is gradually increased, in the second subframe group, the duration of the subframe is gradually increased, and in the third subframe group, the duration of the subframe is gradually increased.
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 A5. The third subframe group includes a third subframe A3 and a sixth subframe A6. In the first subframe group, the duration of the first subframe A1 and the fourth subframe A4 gradually increases. 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 gradually increase. Specifically, the display duration 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 light-emitting device driving circuit provided by the embodiment of the application is used for displaying the 6-bit gray scale level. 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 alternately scan. Specifically, the first sub-frame A1 and the fourth sub-frame A4 are scanned by using the first scan signal scan 1; the second scan signal scan2 is used for scanning in the second sub-frame A2 and the fifth sub-frame A5, and the third scan signal scan3 is used for scanning in the third sub-frame A3 and the sixth sub-frame A6. Therefore, the nth frame must complete the line refresh just before the next frame n+3 frame, and since the sum of the durations of the first, second, and third subframes A1, A2, and A3 is minimum among the sums of the durations of the adjacent three subframes, the duration of scanning all lines must be smaller than the sum of the durations of the first, second, and third subframes A1, A2, and A3.
In the driving method of the driving circuit of the light emitting device provided in the embodiment of the application, taking f as 120hz and fhd as 1080, the scanning signal needs to be obtained
The scan is completed, i.e., the scan signal needs to complete the scan within 0.86 microseconds.
Therefore, the driving circuit for the light emitting device provided in the embodiment of the present application adopts the first scan signal scan1, the second scan signal scan2 and the third scan signal scan3 to scan alternately, so that the time for scanning all the rows by the scan signals can be greatly increased, and the frequency required by the scan signals can be reduced.
Referring to fig. 3 and fig. 5, fig. 5 is a schematic diagram illustrating a subframe time ratio of a second embodiment of a driving circuit of a light emitting device according to an embodiment of the present application. As shown in fig. 5, the light emitting device driving circuit provided in the embodiment of the present application divides one frame period into 6 subframes, specifically, one frame period includes a first subframe A1, a second subframe A2, a third subframe A3, a fourth subframe A4, a fifth subframe A5, and a sixth subframe A6. The first, second, third, fourth, fifth and sixth subframes A1, A2, A3, A4, A5 and A6 have different durations. The light emitting device D emits light in the first, second, and third sub-frame groups. In the first subframe group, the duration of the subframes is gradually increased, in the second subframe group, the duration of the subframes is gradually reduced, and in the third subframe group, the duration of the subframes is gradually increased.
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 A5. The third subframe group includes a third subframe A3 and a sixth subframe A6. In the first subframe group, the duration of the first subframe A1 and the fourth subframe A4 gradually increases. In the second subframe group, the duration of the second subframe A2 and the fifth subframe A5 gradually decrease. In the third subframe group, the durations of the third subframe A3 and the sixth subframe A6 gradually increase. Specifically, the display duration 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 1:32:2:4:16:8. the light-emitting device driving circuit provided by the embodiment of the application is used for displaying the 6-bit gray scale level. 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 alternately scan. Specifically, the first sub-frame A1 and the fourth sub-frame A4 are scanned by using the first scan signal scan 1; the second scan signal scan2 is used for scanning in the second sub-frame A2 and the fifth sub-frame A5, and the third scan signal scan3 is used for scanning in the third sub-frame A3 and the sixth sub-frame A6. Therefore, the nth frame must complete the line refresh just before the next frame n+3 frame, and since the sum of the durations of the third, fourth, and fifth subframes A3, A4, and A5 is minimum among the sums of the durations of the adjacent three subframes, the duration of scanning all lines must be smaller than the sum of the durations of the third, fourth, and fifth subframes A3, A4, and A5.
In the light emitting device driving circuit provided in the embodiment of the present application, taking f as 120hz and fhd as 1080, the scan signal is required to be obtained
The scan is completed, i.e., the scan signal needs to complete the scan within 2.7 microseconds.
Therefore, the driving circuit for the light emitting device provided in the embodiment of the present application adopts the first scan signal scan1, the second scan signal scan2 and the third scan signal scan3 to scan alternately, so that the time for scanning all rows by the scan signal can be increased, and the frequency required by the scan signal can be reduced. In addition, the light-emitting device driving circuit provided by the embodiment of the application adjusts the relative time length of different subframes, so that the time for scanning all rows by the scanning signal is greatly improved, and the frequency required by the scanning signal is greatly reduced.
Referring to fig. 3 and fig. 6, fig. 6 is a schematic diagram illustrating a time ratio driving of a third embodiment of a driving method of a driving circuit of a light emitting device according to an embodiment of the present application. The light emitting device driving circuit provided in the embodiment of the present application divides a frame period into 8 subframes, specifically, 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, second, third, fourth, fifth, sixth, seventh and eighth subframes A1, A2, A3, A4, A5, A6, A7 and A8 are different in duration. The light emitting device D emits light in the first, second, and third sub-frame groups. In the first subframe group, the duration of the subframes is gradually increased, in the second subframe group, the duration of the subframes is gradually reduced, and in the third subframe group, the duration of the subframes is gradually increased.
The first subframe group includes a first subframe A1, a fourth subframe A4, and a seventh subframe A7. The second subframe group includes a third subframe A3 and a sixth subframe A6. The third subframe group includes a second subframe A2, a fifth subframe A5, and an eighth subframe A8. In the first subframe group, the duration of the first, fourth, and seventh subframes A1, A4, and A7 gradually increases. In the second subframe group, the duration of the third subframe A3 and the sixth subframe A6 gradually decrease. In the third subframe group, the durations of the second subframe A2, the fifth subframe A5, and the eighth subframe A8 gradually increase. Specifically, the display duration 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, 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 in a 6-bit gray scale. The seventh subframe A7 and the eighth subframe A8 are compensation subframes, and by setting the seventh subframe A7 and the eighth subframe A8, the light emitting device driving circuit provided in the embodiment of the present application can realize 144-level gray scale display.
The light emitting device driving circuit provided by the embodiment of the application adopts three scanning signals to alternately scan. Specifically, the first sub-frame A1, the fourth sub-frame A4 and the seventh sub-frame A7 are scanned by using the first scan signal scan 1; the second, fifth and eighth subframes A2, A5 and A8 are scanned with the second scan signal scan2, and the third and sixth subframes A3 and A6 are scanned with the third scan signal scan 3. Therefore, the nth frame must complete the line refresh just before the next frame n+3 frame, and since the sum of the durations of the first, second, and third subframes A1, A2, and A3 is minimum among the sums of the durations of the adjacent three subframes, the duration of scanning all lines must be smaller than the sum of the durations of the first, second, and third subframes A1, A2, and A3.
In the light emitting device driving circuit provided in the embodiment of the present application, taking f as 120hz and fhd as 1080, the scan signal is required to be obtained
The scan is completed, i.e., the scan signal needs to complete the scan within 2.6 microseconds.
Therefore, the driving circuit for the light emitting device provided in the embodiment of the present application adopts the first scan signal scan1, the second scan signal scan2 and the third scan signal scan3 to scan alternately, so that the time for scanning all rows by the scan signal can be increased, and the frequency required by the scan signal can be reduced. In addition, the light-emitting device driving circuit provided by the embodiment of the application is further added with two complementary subframes, so that the achievable gray level of the light-emitting device driving circuit provided by the embodiment of the application is improved.
The embodiment of the application can further improve the time of scanning all lines by the scanning signal by adjusting the relative time of different subframes, and reduce the frequency required by the scanning signal 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 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, and each pixel unit 2000 includes the light emitting device driving circuit 10 described above, and the description of the light emitting device driving circuit 10 can be specifically referred to above, which is not repeated here.
Referring to fig. 8, fig. 8 is a flowchart of a driving method of a display panel according to an embodiment of the present application, and as shown in fig. 8, the driving method of a display panel according to an embodiment of the present application includes the following steps:
In order to realize higher gray scale display, it is necessary to divide one frame period into a plurality of subframes.
It should be noted that, the first scan signal, the second scan signal and the third scan line number are adopted to scan a plurality of subframes alternately, so that the N-th frame is only required to finish the line refreshing before the n+3-th frame, the scan signal can finish the scan without having a higher scan signal, and the frequency requirement on the scan signal is further 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 refreshed in a high-order manner. The frame period is divided into a plurality of subframes, and the first scanning signal, the second scanning signal and the third scanning line number are adopted to alternately scan the subframes, so that the N frame is refreshed before the N+3 frame is finished, the scanning signal can finish scanning without higher scanning signal, and the frequency requirement on the scanning signal is reduced.
The above description has been made in detail on a light emitting device driving circuit, a display panel and a driving method thereof provided in the embodiments of the present application, and specific examples are applied herein to illustrate the principles and implementations of the present application, and the above description of the embodiments is only for helping to understand the method and core ideas of the present application; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.
Claims (12)
1. A light emitting device driving circuit, comprising:
the grid electrode of the driving transistor is electrically connected to the first node, the source electrode of the driving transistor is electrically connected to the first power supply, and the drain electrode of the driving transistor is electrically connected to the second node;
the anode of the light-emitting device is electrically connected with the second node, and the cathode of the light-emitting device is electrically connected with a second power supply;
the first end of the capacitor is electrically connected with the first node, and the second end of the capacitor is electrically connected with the second node; and
the writing module is connected with a plurality of data signals and a plurality of scanning signals, and is electrically connected to the first node, the data signals and the scanning signals are in one-to-one correspondence, and the writing module is used for conveying the data signals to the first node under the control of the scanning signals; wherein,,
the writing module comprises a first writing transistor, a second writing transistor and a third writing transistor; 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 grid electrode of the third writing transistor is connected with a third scanning signal, the source electrode of the third writing transistor is connected with a third data signal, and the drain electrode of the third writing transistor is electrically connected with the first node; the first scanning signal, the second scanning signal and the third scanning signal are scanned alternately;
the light emitting device emits light in a first subframe group, a second subframe group and a third subframe group in one frame period; the first subframe group, the second subframe group and the third subframe group comprise a plurality of subframes, the duration of the subframes is different, and the subframes comprise a first subframe, a second subframe, a third subframe, a fourth subframe, a fifth subframe and a sixth subframe;
the first sub-frame and the fourth sub-frame are scanned by the first scanning signal, the second sub-frame and the fifth sub-frame are scanned by the second scanning signal, and the third sub-frame and the sixth sub-frame are scanned by the third scanning signal.
2. The light-emitting device driving circuit according to claim 1, wherein in the first subframe group, a duration of the subframe gradually increases, in the second subframe group, a duration of the subframe gradually increases, and in the third subframe group, a duration of the subframe gradually increases.
3. The light-emitting device driving circuit according to claim 2, wherein the first subframe group includes the first subframe and the fourth subframe, the second subframe group includes the second subframe and the fifth subframe, and the third subframe group includes the third subframe and the sixth subframe; wherein,,
in the first subframe group, the duration of the first subframe and the fourth subframe gradually increase, in the second subframe group, the duration of the second subframe and the fifth subframe gradually increase, and in the third subframe group, the duration of the third subframe and the sixth subframe gradually increase.
4. The light-emitting device driving circuit according to claim 3, wherein a ratio of time lengths among the first subframe, the second subframe, the third subframe, the fourth subframe, the fifth subframe, and the sixth subframe is 1:2:4:8:16:32.
5. the light-emitting device driving circuit according to claim 1, wherein in the first subframe group, a time length of the subframe gradually increases, in the second subframe group, a time length of the subframe gradually decreases, and in the third subframe group, a time length of the subframe gradually increases.
6. The light-emitting device driving circuit according to claim 5, wherein the first subframe group includes the first subframe and the fourth subframe, the second subframe group includes the second subframe and the fifth subframe, and the third subframe group includes the third subframe and the sixth subframe; wherein,,
in the first subframe group, the duration of the first subframe and the fourth subframe gradually increase, in the second subframe group, the duration of the second subframe and the fifth subframe gradually decrease, and in the third subframe group, the duration of the third subframe and the sixth subframe gradually increase.
7. The light-emitting device driving circuit according to claim 6, wherein a ratio of time lengths among the first subframe, the second subframe, the third subframe, the fourth subframe, the fifth subframe, and the sixth subframe is 1:32:2:4:16:8.
8. the light-emitting device driving circuit according to claim 5, wherein the subframe further comprises a seventh subframe and an eighth subframe, wherein the first subframe group comprises the first subframe, the fourth subframe, and the seventh subframe, wherein the second subframe group comprises the third subframe and the sixth subframe, and wherein the third subframe group comprises the second subframe, the fifth subframe, and the eighth subframe; wherein,,
in the first subframe group, the duration of the first, fourth and seventh subframes gradually increases, in the second subframe group, the duration of the third and sixth subframes gradually decreases, and in the third subframe group, the duration of the second, fifth and eighth subframes gradually increases.
9. The light-emitting device driving circuit according to claim 8, wherein a ratio of a duration between the first subframe, the second subframe, the third subframe, the fourth subframe, the fifth subframe, the sixth subframe, the seventh subframe, and the eighth subframe is 1:2:45:4:8:36:16:32.
10. a display panel comprising a plurality of pixel cells arranged in an array, each of the pixel cells comprising the light emitting device driving circuit of any one of claims 1-9.
11. A driving method of a display panel, for driving the display panel according to claim 10, the driving method comprising:
dividing a frame period into a first subframe, a second subframe, a third subframe, a fourth subframe, a fifth subframe and a sixth subframe;
alternately scanning a plurality of subframes by adopting a first scanning signal, a second scanning signal and a third scanning signal; wherein, the first scanning signal is adopted for scanning when the first subframe and the fourth subframe are adopted; scanning with the second scanning signal when the second subframe and the fifth subframe are used; and scanning by adopting the third scanning signal when the third subframe and the sixth subframe are adopted.
12. The driving method of a display panel according to claim 11, wherein the one frame period further includes a seventh subframe and an eighth subframe; scanning with the first scanning signal at the seventh subframe; and scanning by adopting the second scanning signal at the eighth subframe.
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