CN113823224B - Driving method and driving chip of OLED display panel and display device - Google Patents
Driving method and driving chip of OLED display panel and display device 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]
- 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]
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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
- G09G3/3258—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 with pixel circuitry controlling the voltage across the light-emitting element
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Abstract
The application provides a driving method, a driving chip and a display device of an OLED display panel, relates to the technical field of display, and is used for solving the problem of screen flicker of the OLED display panel in a low-frequency mode. The driving method comprises a plurality of driving cycles, when the OLED display panel is in a low-frequency mode, each driving cycle comprises a first writing stage, a first transition stage, a first maintaining stage and a second transition stage which are sequentially executed, in the first writing stage, writing voltage is input to a pixel circuit of the display panel, in the first transition stage, first transition voltage is input to the pixel circuit, in the first maintaining stage, maintaining voltage is input to the pixel circuit, and in the second transition stage, second transition voltage is input to the pixel circuit; the voltage values of the first transition voltage and the second transition voltage are both between the voltage value of the write voltage and the voltage value of the hold voltage. The driving method can effectively improve the screen flicker phenomenon of the OLED display panel in the low-frequency mode.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a driving method, a driving chip and a display device for an OLED display panel.
Background
An Organic Light Emitting Diode (OLED) is a current type Light Emitting device, and is widely used in display devices such as mobile phones and tablet computers due to its characteristics of self-luminescence, fast response, wide viewing angle, and being capable of being fabricated on a flexible substrate.
The OLED display panel of the display device can display by adopting different image refreshing frequencies in different application scenes, for example, in application scenes for displaying dynamic pictures such as games and videos, the OLED display panel is in a high-frequency mode, and in the mode, the OLED display panel displays by adopting a higher image refreshing frequency so as to ensure the fluency of the display pictures; in an application scene of displaying a static picture such as an electronic book, the OLED display panel is in a low-frequency mode, and in the low-frequency mode, the OLED display panel adopts a low image refresh frequency to reduce power consumption of the OLED display panel.
However, when the OLED display panel is in the low frequency mode, a screen flicker phenomenon may occur, which affects the visual experience of the user.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present application provide a driving method, a driving chip and a display device for an OLED display panel, which can reduce or eliminate a screen flicker phenomenon of the OLED display panel in a low frequency mode.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
a first aspect of an embodiment of the present application provides a driving method of an OLED display panel, where the driving method includes a plurality of driving cycles, and when the OLED display panel is in a low frequency mode, each driving cycle includes sequentially executing a first write phase, a first transition phase, a first hold phase, and a second transition phase, where in the first write phase, a write voltage is input to a pixel circuit of the display panel, in the first transition phase, a first transition voltage is input to the pixel circuit, in the first hold phase, a hold voltage is input to the pixel circuit, and in the second transition phase, a second transition voltage is input to the pixel circuit; wherein the voltage values of the first and second transition voltages are both between the voltage value of the write voltage and the voltage value of the hold voltage.
In the driving method of the OLED display panel provided in the embodiment of the present application, when the OLED display panel is in the low frequency mode, each driving cycle includes a first write stage, a first transition stage, a first hold stage, and a second transition stage that are sequentially executed, and the write voltage, the first transition voltage, the hold voltage, and the second transition voltage are respectively input to the pixel circuit at each stage. And the voltage values of the first transition voltage and the second transition voltage are both between the voltage value of the writing voltage and the voltage value of the holding voltage. Therefore, in a driving period, the voltage input into the pixel circuit is changed from the writing voltage to the first transition voltage and then is changed from the first transition voltage to the holding voltage, and the voltage input into the pixel circuit is prevented from being directly mutated from the writing voltage to the holding voltage; in addition, before entering the next driving period from one driving period, the voltage input to the pixel circuit is changed from the holding voltage to the second transition voltage, and when entering the next driving period, the voltage input to the pixel circuit is changed from the second transition voltage to the writing voltage, so that the situation that the voltage input to the pixel circuit is directly mutated from the holding voltage to the writing voltage is avoided.
Through the arrangement of the first transition stage and the second transition stage, the sudden change of the voltage input into the pixel circuit can be reduced, so that the sudden change of the luminous brightness of the luminous element driven by the pixel circuit is reduced, and the screen flicker phenomenon of the OLED display panel in the low-frequency mode is reduced or eliminated. In addition, the problem of screen flicker can be reduced or eliminated by changing the voltage input into the pixel circuit, the control method is simple, and the structure of the pixel circuit does not need to be changed.
In one possible implementation manner, the first transition phase includes M first transition sub-phases that are sequentially executed, and a constant first transition voltage is input to the pixel circuit in each first transition sub-phase; in different first transition sub-stages, the first transition voltages sequentially increase or decrease in time sequence, and M is a positive integer greater than or equal to 2; and/or the second transition stage comprises N second transition sub-stages which are executed in sequence, in each second transition sub-stage, a constant second transition voltage is input into the pixel circuit, in different second transition sub-stages, the second transition voltage is sequentially reduced or sequentially increased according to the time sequence, and N is a positive integer which is more than or equal to 2.
In one possible implementation, the durations of the first transition sub-phases are equal; and/or the duration of each of the second transition sub-phases is equal.
In a possible implementation manner, the voltage difference Δ V of the first transition voltage corresponding to the adjacent first transition sub-phase 1 Are all | V 1 -V 2 I/(M + 1), whichIn, V 1 Is the voltage value of the write voltage, V 2 Is the voltage value of the holding voltage; and/or the voltage difference value DeltaV of the second transition voltage corresponding to the adjacent second transition sub-phase 2 Are all | V 1 -V 2 I/(N + 1), where V 1 Is the voltage value of the write voltage, V 2 Is the voltage value of the holding voltage.
In a possible implementation manner, the voltage difference Δ V of the first transition voltage corresponding to the adjacent first transition sub-phase 1 The range of Δ V1 is less than or equal to 0.1V and less than or equal to 0.6V;
the voltage difference value delta V2 of the second transition voltage corresponding to the adjacent second transition sub-stage is within the range of delta V being more than or equal to 0.1V 2 Less than or equal to 0.6V.
In one possible implementation, when the OLED display panel is in a high-frequency mode, each driving cycle includes a second writing phase and a second holding phase that are sequentially performed, in the second writing phase, a writing voltage is input to the pixel circuit, and in the second holding phase, a holding voltage is input to the pixel circuit.
In one possible implementation, in the low frequency mode, each drive cycle has a duration T 1 In the high-frequency mode, each drive period has a duration T 2 (ii) a Wherein, T 1 ＝K*T 2 And K is a positive integer of 2 or more.
In one possible implementation, the duration of the first writing phase is equal to the duration of the second writing phase.
A second aspect of the embodiments of the present application provides a driving chip for performing the driving method of the OLED display panel as described above.
Since the driving chip performs the driving method of the OLED display panel of the first aspect, the driving chip also has the same advantages as the driving method of the OLED display panel, and in particular, reference may be made to the above description.
A third aspect of the embodiments of the present application provides a display device, which includes an OLED display panel and the driving chip as described above, where the driving chip is in signal connection with a pixel circuit of the OLED display panel.
Since the display device includes the driving chip of the second aspect, the display device also has the same advantages as the driving chip described above, and in particular, reference may be made to the above description.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a timing diagram illustrating voltage variation of a pixel circuit and luminance variation of a light emitting device of an OLED display panel in a low frequency mode according to the related art;
FIG. 2 is a circuit diagram of a pixel circuit and a driving chip of an OLED display panel in the related art;
FIG. 3 is a graph showing a variation of luminance values of light-emitting devices in a low frequency mode with time in the related art;
fig. 4 is a graph showing a relationship between a voltage inputted to the pixel circuit and a variation of the light emitting element FMA value in the low frequency mode in the related art;
fig. 5 is a timing diagram of voltage variation input to a pixel circuit of an OLED display panel in the driving method according to the embodiment of the present disclosure;
FIG. 6 is a graph comparing the luminance values of the light emitting elements with time when the OLED display panel is in a low frequency mode, and when the driving method of the related art is adopted and the driving method of the embodiment of the present application is adopted;
fig. 7 is a graph illustrating a relationship between a voltage input to the pixel circuit and a variation of the light emitting element FMA value in the low frequency mode in the driving method according to the embodiment of the present application.
Description of reference numerals:
10-a switching transistor; 20-a drive transistor;
30-a storage capacitor; 40-a light emitting element;
200-a driving chip; 300-data line.
Detailed Description
As described in the background art, in the related art, when the OLED display panel is in the low frequency mode, a screen flicker phenomenon may occur, which affects the visual experience of a user. In view of this problem, the inventors of the present application have found that, as shown in fig. 1, one driving cycle of the OLED display panel includes a writing phase in which a voltage (V in fig. 1) input to the pixel circuit of the OLED display panel is a writing voltage and a holding phase in which a voltage input to the pixel circuit of the OLED display panel is a holding voltage.
Due to the large difference between the writing voltage and the holding voltage, when the writing phase enters the holding phase and the holding phase enters the writing phase of the next period, the voltage input to the pixel circuit changes abruptly, so that the gate voltage of the driving transistor in the pixel circuit changes abruptly. The abrupt change of the gate voltage of the driving transistor may cause the abrupt change of the bias state of the driving transistor, and further cause the abrupt change of the driving current for driving the light emitting element, resulting in the abrupt change of the luminance (luminece in fig. 1) of the light emitting element driven by the pixel circuit. When the OLED display panel is in the low-frequency mode, the duration of the hold period is long, and the sudden change in the brightness of the light-emitting elements may cause a screen flicker visible to human eyes.
Taking the pixel circuit shown in fig. 2 as an example, the problem of screen flicker generated when the OLED display panel is in the low-frequency mode is specifically analyzed. As shown in fig. 2, the pixel circuit of the OLED display panel generally includes a switching transistor 10, a driving transistor 20, a storage capacitor 30, and a light emitting element 40, wherein a source of the switching transistor 10 is connected to the driving chip 200 through a data line 300, a drain of the switching transistor 10 is connected to a gate of the driving transistor 20 and a first plate of the storage capacitor 30, a source of the driving transistor 20 is connected to a power source VDD and a second plate of the storage capacitor 30, a drain of the driving transistor 20 is connected to the light emitting element 40, and the light emitting element 40 may be an OLED device.
In the writing phase, the switching transistor 10 is turned on, the driving chip 200 inputs a writing voltage to the source of the switching transistor 10 through the data line 300, the writing voltage is written to the gate of the driving transistor 20 through the source and the drain of the switching transistor 10, the driving transistor 20 generates a driving current according to the writing voltage written to the gate thereof, and the light emitting element 40 emits light in response to the driving current. At this stage, the storage capacitor 30 stores the write voltage.
In the holding phase, the switching transistor 10 is turned off, the driving chip 200 inputs a holding voltage to the source of the switching transistor 10 through the data line 300, and at the same time, the storage capacitor 30 supplies power to the gate of the driving transistor 20, so that the driving transistor 20 is kept in an on state, thereby maintaining the light emitting state of the light emitting element 40. At this stage, although the switching transistor 10 is in the off state, there is leakage in the off state, and therefore, when the source input voltage of the switching transistor 10 abruptly changes, the gate voltage of the driving transistor 20 is affected, and the gate voltage of the driving transistor 20 abruptly changes.
As described above, the abrupt change of the gate voltage of the driving transistor 20 causes the abrupt change of the luminance of the light emitting element 40, and as shown in fig. 3, the luminance value of the light emitting element 40 abruptly changes both when the writing phase enters the holding phase and when the holding phase enters the writing phase of the next cycle. When the OLED display panel is in a low-frequency mode, a screen flicker phenomenon visible to human eyes can be generated.
Fig. 4 is a graph showing a relationship between a voltage input to the pixel circuit and a variation of the FMA value of the light emitting element in the low frequency mode, where FMA (Flicker Modulation Amplitude, flicker rate) is used to represent a Flicker degree of the light emitting element 40, and the larger FMA value is, the more serious the Flicker of the light emitting element 40 is, as shown in fig. 4, when the voltage input to the pixel circuit is changed from 5.98 v to 4.6 v, the larger the variation of the voltage is, the variation of the FMA value is increased, and at this time, the OLED display panel may generate a screen Flicker phenomenon visible to human eyes.
In view of the above technical problems, an embodiment of the present application provides a driving method for an OLED display panel, where when the OLED display panel is in a low frequency mode, a first transition stage is set between a first writing stage and a first maintaining stage, and a second transition stage is set after the first maintaining stage, so that a sudden change of a voltage input to a pixel circuit can be reduced, thereby reducing a sudden change of a luminance of a light emitting element driven by the pixel circuit, and further reducing or eliminating a screen flicker phenomenon of the OLED display panel in the low frequency mode.
In order to make the aforementioned objects, features and advantages of the embodiments of the present application more comprehensible, embodiments of the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely 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 embodiment of the application provides a display device, and the display device comprises an OLED display panel and a driving chip, wherein the OLED display panel comprises a pixel circuit, the pixel circuit is in signal connection with the driving chip, the driving chip inputs voltage to the pixel circuit, and the pixel circuit drives a light-emitting element to emit light according to the input voltage, so that the image display of the OLED display panel is realized. It is to be understood that the OLED display panel generally includes a plurality of pixel circuits, and each pixel circuit may be connected to one light emitting element or a plurality of light emitting elements, which is not limited in this embodiment.
The OLED display panel has a low-frequency mode and a high-frequency mode, and in the low-frequency mode, the OLED display panel displays at a low image refresh frequency, for example, in an application scene such as an electronic book displaying a static picture, the OLED display panel is in the low-frequency mode, so that the power consumption of the OLED display panel is reduced. In the high-frequency mode, the OLED display panel displays at a high image refresh frequency, for example, in an application scene of a dynamic picture such as a game, the OLED display panel is in the high-frequency mode, so that the fluency of the picture displayed by the OLED display panel is improved.
It should be noted that, in general, the OLED display panel is in a low-frequency mode when the image refresh frequency is lower than 10 Hz. Of course, the low frequency mode is not limited to the image refresh frequency being lower than 10Hz, and can be set according to the specific application scenario and requirements of the OLED display panel. The program for judging whether the OLED display panel enters the low-frequency mode is usually arranged in the driving chip, and when the condition of entering the low-frequency mode is met, the driving chip automatically controls the OLED display panel to enter the low-frequency mode.
In the driving process of the OLED display panel, a plurality of driving cycles are generally included, and when the OLED display panel is in the low frequency mode, as shown in fig. 5, each driving cycle includes a first writing phase S10, a first transition phase S20, a first holding phase S30, and a second transition phase S40, which are sequentially performed. Inputting a write voltage to a pixel circuit of a display panel in a first write stage; inputting a first transition voltage to the pixel circuit in a first transition stage; in a first holding stage, a holding voltage is input to the pixel circuit; in a second transition phase, a second transition voltage is input to the pixel circuit. The voltage values of the first transition voltage and the second transition voltage are both between the voltage value of the write voltage and the voltage value of the hold voltage.
It is understood that the voltage value of the first transition voltage is between the voltage value of the write voltage and the voltage value of the hold voltage, which means that the voltage value of the first transition voltage is not equal to the voltage values of the write voltage and the hold voltage, and is between the two voltage values. For example, when writing the voltage value V of the voltage 1 Voltage value V greater than holding voltage 2 While, the voltage value V of the first transition voltage 3 Satisfies the following conditions: v 2 ＜V 3 ＜V 1 . When the voltage value V of the writing voltage 1 Voltage value V less than holding voltage 2 While, the voltage value V of the first transition voltage 3 Satisfies the following conditions: v 1 ＜V 3 ＜V 2 。
Similarly, the voltage value of the second transition voltage is between the voltage value of the write voltage and the voltage value of the hold voltage, which means that the voltage value of the second transition voltage is different from and between the voltage value of the write voltage and the voltage value of the hold voltage. For example, when writing the voltage value of the voltageV 1 Voltage value V greater than holding voltage 2 While, the voltage value V of the second transition voltage 4 Satisfies the following conditions: v 2 ＜V 4 ＜V 1 . When the voltage value V of the writing voltage 1 Voltage value V less than holding voltage 2 While, the voltage value V of the second transition voltage 4 Satisfies the following conditions: v 1 ＜V 4 ＜V 2 。
In addition, the "driving period" is relative to one pixel circuit, and generally, one driving period corresponds to one frame time, that is, one frame is taken as one driving period.
In the driving method of the OLED display panel provided in the embodiment of the application, when the OLED display panel is in the low-frequency mode, the first transition stage is set between the first writing stage and the first holding stage, and the second transition stage is set after the first holding stage, so that in one driving cycle, the voltage input to the pixel circuit is changed from the writing voltage to the first transition voltage, and then is changed from the first transition voltage to the holding voltage, thereby preventing the voltage input to the pixel circuit from being directly mutated from the writing voltage to the holding voltage. Before entering the next driving period from one driving period, the voltage input into the pixel circuit is changed from the holding voltage to the second transition voltage, and when entering the next driving period, the voltage input into the pixel circuit is changed from the second transition voltage to the writing voltage, so that the situation that the voltage input into the pixel circuit is directly mutated from the holding voltage to the writing voltage is avoided.
Through the arrangement of the first transition stage and the second transition stage, the design can reduce the abrupt change of the voltage input into the pixel circuit, thereby reducing the abrupt change of the grid voltage of the driving transistor in the pixel circuit, further reducing the abrupt change of the driving current for driving the light-emitting element, reducing the abrupt change of the light-emitting brightness of the light-emitting element driven by the pixel circuit, and further reducing or eliminating the screen flicker phenomenon of the OLED display panel in a low-frequency mode. In addition, the problem of screen flicker can be improved by changing the voltage input into the pixel circuit, the control method is simple, and the structure of the pixel circuit does not need to be changed.
In the first transition phase, the driving chip may input a constant first transition voltage to the pixel circuit, the constant first transition voltage having a voltage value between the writing voltage and the holding voltage. The first transition voltage with gradually changing voltage value can be input into the pixel circuit, and the gradually changing first transition voltage can further reduce the abrupt change of the brightness of the light-emitting element, so that the problem of low-frequency flicker of the OLED display panel is further improved.
When the driving chip inputs the first transition voltage with gradually changing voltage value to the pixel circuit in the first transition stage, in an optional embodiment, the first transition stage includes M first transition sub-stages executed in sequence, and in each first transition sub-stage, a constant first transition voltage is input to the pixel circuit. In different first transition sub-stages, the first transition voltages sequentially increase or sequentially decrease in time sequence, and M is a positive integer greater than or equal to 2.
By dividing the first transition stage into a plurality of first transition sub-stages, the voltage value of the first transition voltage is changed in a step manner in the first transition stage, the voltage difference value of each change is small, and the change of the gate voltage of the driving transistor in the pixel circuit is small, so that the stability of the bias state of the driving transistor is further improved, the brightness change of the light-emitting element is reduced, and the display effect of the OLED display panel in a low-frequency mode is improved.
Fig. 6 is a graph comparing the luminance variation of the light emitting device when the OLED display panel is in the low frequency mode and the driving method of the related art is adopted with the driving method of the above embodiment. In the driving method of the related art, each driving cycle includes a writing phase in which a writing voltage is input to the pixel circuit of the OLED display panel and a holding phase in which a holding voltage is input to the pixel circuit of the OLED display panel. As can be seen from comparison of fig. 6, by using the driving method of the above embodiment, the luminance of the light emitting element can be changed step by step, and the luminance change is hard to be perceived by human eyes, so that the problem of screen flicker in the low frequency mode of the OLED display panel is improved.
Fig. 7 is a graph illustrating a relationship between a voltage input to the pixel circuit and a variation of the light emitting element FMA value in the low frequency mode in the driving method according to the embodiment of the present application. As can be seen from fig. 7, in the driving method provided in the embodiment of the present application, the voltage input to the pixel circuit does not suddenly change, so that the FMA value does not suddenly increase, thereby reducing or eliminating the screen flicker phenomenon in the low frequency mode of the OLED display panel.
The number of the first transition sub-stages included in the first transition stage is not limited, i.e. the specific value of M is not limited, and may be set to 2, 3, 4, 9, 10, 12, etc., for example. In an alternative embodiment, as shown in fig. 5, M is 3, i.e. the first transition phase comprises 3 first transition sub-phases S21 executed in sequence, and in the first transition sub-phase, the voltage value of the first transition voltage is V 31 And is kept unchanged, and in the second first transition sub-stage, the voltage value of the first transition voltage is V 32 And is kept unchanged, and in the third first transition sub-stage, the voltage value of the first transition voltage is V 33 And remain unchanged. When the voltage value V of the writing voltage 1 Voltage value V greater than holding voltage 2 When, V 31 、V 32 、V 33 Satisfies the following conditions: v 33 ＜V 32 ＜V 31 . When the voltage value V of the writing voltage 1 Voltage value V less than holding voltage 2 When, V 31 、V 32 、V 33 Satisfies the following conditions: v 31 ＜V 32 ＜V 33 。
In a first transition stage, the durations of the first transition sub-stages may be equal or unequal, and in an optional embodiment, the durations of the first transition sub-stages are equal, so that only one timing duration corresponding to the first transition sub-stage needs to be stored in the driver chip, thereby simplifying the control process and reducing the storage requirement on the driver chip.
The voltage difference value DeltaV of the first transition voltage corresponding to the adjacent first transition sub-phase 1 Without limitation, the voltage input to the pixel circuit may be changed from the writing voltage to the holding voltage step by step. In some embodiments, 0.1 volts ≦ Δ V 1 Less than or equal to 0.6V, i.e.The method can ensure that the screen flicker is caused by overlarge brightness change of the light-emitting element, and can avoid the increase of power consumption caused by frequent change of voltage input into the pixel circuit in the first transition stage.
In a first transition phase, the voltage differences Δ V 1 The first transition voltages may be equal or unequal, and in an alternative embodiment, the voltage difference Δ V of the first transition voltages corresponding to the adjacent first transition sub-phases 1 Are all | V 1 -V 2 L (/ (M + 1)), where, V 1 Is the voltage value of the write voltage, V 2 To maintain the voltage value of the voltage. For example, if the difference between the write voltage and the hold voltage is 2,M is 9, then Δ V 1 =0.2 v, in this case, one driving cycle includes 9 first transition sub-phases, and the voltage difference of the first transition voltage of each adjacent first transition sub-phase is 0.2.
In the above embodiment, the first transition voltage in the first transition stage changes in an equal difference manner, so that the change amount of the voltage value is equal when the voltage input to the pixel circuit changes in the first transition stage each time, thereby improving the uniformity of the brightness change of the light emitting element and further optimizing the display effect of the OLED display panel.
Voltage difference Δ V 1 The value of (b) may be a fixed value, which is stored in the driver chip in advance. In another alternative embodiment, a plurality of voltage difference values Δ V are stored in the driving chip 1 Different voltage difference value DeltaV 1 Respectively corresponding to different brightness and different M values, before entering a first transition stage, obtaining the current brightness of the light-emitting element, and selectively calling the voltage difference value delta V corresponding to the current brightness 1 And the M value controls the first transition voltage of the subsequent first transition stage, wherein the larger the luminous brightness is, the voltage difference value delta V is 1 The larger.
The lower the brightness, the sharper the perception of flicker by the human eye, and the voltage difference Δ V needed at this time 1 The smaller the difference, and when the brightness is higher the human eye is less sensitive to the perception of flicker, when the larger the voltage difference av 1 The requirements can be met. In the above embodiments, the light emitting element is based onSelecting proper voltage difference value delta V according to current light emitting brightness 1 And M value, when the luminous brightness is lower, selecting smaller voltage difference value delta V 1 And a larger number of voltage changes, and when the brightness of the emitted light is higher, a larger voltage difference value delta V is selected 1 And the voltage change of less times, can enough guarantee OLED display panel display effect under the low frequency mode, avoid appearing the screen scintillation phenomenon, can reduce OLED display panel's consumption again.
Similarly, in the second transition phase, the driving chip may input a constant second transition voltage having a voltage value between the writing voltage and the holding voltage to the pixel circuit. The second transition voltage with gradually changing voltage value can be input into the pixel circuit, and the gradually changing second transition voltage can further reduce the abrupt change of the brightness of the light-emitting element, so that the problem of low-frequency flicker of the OLED display panel is further improved.
When the driving chip inputs the second transition voltage with gradually changing voltage value to the pixel circuit in the second transition stage, in an alternative embodiment, as shown in fig. 5, the second transition stage includes N second transition sub-stages S41 executed in sequence, and a constant second transition voltage is input to the pixel circuit in each second transition sub-stage. And in different second transition sub-stages, the second transition voltages are sequentially reduced or sequentially increased in time sequence, and N is a positive integer greater than or equal to 2.
Optionally, the durations of the second transition sub-phases are equal.
Optionally, the voltage difference Δ V of the second transition voltages corresponding to the adjacent second transition sub-phases 2 Are all | V 1 -V 2 I/(N + 1), where V 1 To the voltage value of the write voltage, V 2 To maintain the voltage value of the voltage.
Optionally, the voltage difference Δ V of the second transition voltages corresponding to the adjacent second transition sub-phases 2 In the range of 0.1 V.ltoreq.V 2 Less than or equal to 0.6V.
Since the second transition stage is used to gradually change the voltage input to the pixel circuit from the holding voltage to the writing voltage, a change process of the second transition voltage in the second transition stage is opposite to a change process of the first transition voltage in the first transition stage, and for the setting of the second transition voltage, reference may be made to the above-mentioned embodiments for the first transition voltage, which is not described herein again.
Further, when the OLED display panel is in the high frequency mode, each driving cycle includes a second writing phase in which a writing voltage is input to the pixel circuit and a second holding phase in which a holding voltage is input to the pixel circuit, which are sequentially performed. In the high-frequency mode, the image refreshing frequency of the OLED display panel is high, and the brightness of the light-emitting element is hard to be perceived by human eyes when the brightness changes suddenly, so that transition stages do not need to be arranged between the second writing stage and the second holding stage and between the second holding stage and the second writing stage of the next driving period in the high-frequency mode.
The duration of the driving periods in the low frequency mode is preferably generated in a Frame skip manner, in this embodiment, the duration of each driving period in the low frequency mode is T 1 In the high-frequency mode, each drive period has a duration T 2 ；T 1 ＝K*T 2 And K is a positive integer of 2 or more. For example, the image refresh frequency in the high frequency mode is 120Hz, and the duration of each driving period in the high frequency mode is 8.3 msec. The image refresh frequency in the low frequency mode is 10Hz, and K is 12, and the duration of each driving period in the low frequency mode is 100ms.
Further, the duration of the first writing phase is equal to the duration of the second writing phase, for example, in an embodiment where the image refresh frequency of the high frequency mode is 120Hz and the image refresh frequency of the low frequency mode is 10Hz, the duration of the first writing phase and the duration of the second writing phase are both 38.5 microseconds.
It is understood that, in the present application, both the switching transistor and the driving transistor in the pixel circuit of the OLED display panel may be Low Temperature Polysilicon (LTPS). Preferably, the switching transistor is Indium Gallium Zinc Oxide (IGZO), and the driving transistor is Low Temperature Polysilicon (LTPS).
In the driving method of the OLED display panel provided in the embodiment of the present application, when the OLED display panel is in the low frequency mode, each driving cycle includes a first write stage, a first transition stage, a first hold stage, and a second transition stage that are sequentially executed, and the write voltage, the first transition voltage, the hold voltage, and the second transition voltage are respectively input to the pixel circuit at each stage. Wherein the voltage values of the first transition voltage and the second transition voltage are both between the voltage value of the write voltage and the voltage value of the hold voltage. Therefore, in a driving period, the voltage input into the pixel circuit is changed from the writing voltage to the first transition voltage and then is changed from the first transition voltage to the holding voltage, and the voltage input into the pixel circuit is prevented from being directly mutated from the writing voltage to the holding voltage; before entering the next driving period from one driving period, the voltage input into the pixel circuit is changed from the holding voltage to the second transition voltage, and when entering the next driving period, the voltage input into the pixel circuit is changed from the second transition voltage to the writing voltage, so that the situation that the voltage input into the pixel circuit is directly mutated from the holding voltage to the writing voltage is avoided.
The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
In general, terms should be understood at least in part by their use in context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in the singular or may be used to describe a combination of features, structures, or characteristics in the plural, depending, at least in part, on the context. Similarly, terms such as "a" or "the" may also be understood to convey a singular use or to convey a plural use, depending at least in part on the context.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. A driving method of an OLED display panel includes a plurality of driving cycles, each driving cycle includes a first writing phase, a first transition phase, a first sustain phase and a second transition phase which are sequentially performed when the OLED display panel is in a low frequency mode,
inputting a write voltage to a pixel circuit of the display panel in the first write stage; inputting a first transition voltage to the pixel circuit in the first transition phase; inputting a holding voltage to the pixel circuit in the first holding phase; inputting a second transition voltage to the pixel circuit in the second transition phase; wherein the voltage values of the first and second transition voltages are both between the voltage value of the write voltage and the voltage value of the hold voltage;
the first transition stage comprises M first transition sub-stages which are executed in sequence; the second transition stage comprises N second transition sub-stages which are executed in sequence;
the voltage difference value delta V of the first transition voltage corresponding to the adjacent first transition sub-phase 1 Are all | V 1 -V 2 I/(M + 1), where V 1 Is the voltage value of the write voltage, V 2 Is the voltage value of the holding voltage; and/or the presence of a gas in the gas,
the voltage difference value delta V of the second transition voltage corresponding to the adjacent second transition sub-phase 2 Are all | V 1 -V 2 I/(N + 1), where V 1 Is the voltage value of the write voltage, V 2 Is the voltage value of the holding voltage.
2. The method according to claim 1, wherein a constant first transition voltage is input to the pixel circuit in each of the first transition sub-phases; in different first transition sub-stages, the first transition voltages sequentially increase or decrease in time sequence, and M is a positive integer greater than or equal to 2; and/or the presence of a gas in the gas,
and in each second transition sub-stage, inputting a constant second transition voltage to the pixel circuit, wherein in different second transition sub-stages, the second transition voltages are sequentially reduced or sequentially increased in time sequence, and N is a positive integer greater than or equal to 2.
3. The method according to claim 2, wherein the first transition sub-phases are equal in duration; and/or the presence of a gas in the gas,
the duration of each of the second transition sub-phases is equal.
4. The method according to claim 2, wherein the voltage difference Δ V between the first transition voltages corresponding to the adjacent first transition sub-phases 1 In the range of 0.1 V.ltoreq.V 1 Less than or equal to 0.6V;
the voltage difference value delta V of the second transition voltage corresponding to the adjacent second transition sub-phase 2 In the range of 0.1 V.ltoreq.V 2 Less than or equal to 0.6V.
5. The method of driving the OLED display panel according to any one of claims 1 to 4, wherein each driving cycle includes a second write phase in which a write voltage is input to the pixel circuit and a second hold phase in which a hold voltage is input to the pixel circuit, which are sequentially performed when the OLED display panel is in a high-frequency mode.
6. The method of claim 5, wherein in the low frequency mode, each driving period has a duration T 1 In the high-frequency mode, each drive period has a duration T 2 ；
Wherein, T 1 ＝K*T 2 And K is a positive integer of 2 or more.
7. The method according to claim 5, wherein the duration of the first writing phase is equal to the duration of the second writing phase.
8. A driving chip for performing the method of driving the OLED display panel according to any one of claims 1 to 7.
9. A display device comprising an OLED display panel and the driving chip of claim 8, wherein the driving chip is in signal connection with the pixel circuit of the OLED display panel.
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