CN113793568A - Pixel driving circuit, control method thereof, display screen and display device - Google Patents
Pixel driving circuit, control method thereof, display screen and display device Download PDFInfo
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- CN113793568A CN113793568A CN202111254970.0A CN202111254970A CN113793568A CN 113793568 A CN113793568 A CN 113793568A CN 202111254970 A CN202111254970 A CN 202111254970A CN 113793568 A CN113793568 A CN 113793568A
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The embodiment of the application relates to a pixel driving circuit, a control method thereof, a display screen and display equipment, wherein the pixel driving circuit comprises: the driving transistor is provided with a first pole and a second pole, the driving transistor is used for receiving a data signal in a data refreshing stage and generating a driving current according to the data signal, and the second pole is used for outputting the driving current to a light-emitting device in the data refreshing stage and a data maintaining stage so as to drive the light-emitting device to emit light; a low-frequency initialization transistor, a first pole of the low-frequency initialization transistor being connected to the first pole of the driving transistor, a second pole of the low-frequency initialization transistor being configured to receive a third initialization signal during the data holding phase, and the low-frequency initialization transistor being configured to initialize the driving transistor according to the third initialization signal, so that the fluctuation values of the driving current during the data refreshing phase and the data holding phase are within a preset range.
Description
Technical Field
The embodiment of the application relates to the technical field of display, in particular to a pixel driving circuit, a control method thereof, a display screen and display equipment.
Background
With the continuous development of display technologies, the display technologies are sequentially applied to various mobile terminals, such as mobile phones, tablet computers, and various wearable devices. The battery capacity of the mobile terminal is usually small, so people set a variable frame rate mode for the mobile terminal, the frequency variation range is as low as 1Hz and as high as 140Hz, and in the low frequency display mode, the time of the data holding phase is long, and based on the existing OLED display driving circuit, it is difficult to maintain the display stability.
Disclosure of Invention
The embodiment of the application provides a pixel driving circuit, a control method thereof, a display screen and display equipment, and the display brightness stability can be optimized.
A pixel driving circuit, the pixel driving circuit comprising:
the driving transistor is provided with a first pole and a second pole, the driving transistor is used for receiving a data signal in a data refreshing stage and generating a driving current according to the data signal, and the second pole is used for outputting the driving current to a light-emitting device in the data refreshing stage and a data maintaining stage so as to drive the light-emitting device to emit light;
a low-frequency initialization transistor, a first pole of the low-frequency initialization transistor being connected to the first pole of the driving transistor, a second pole of the low-frequency initialization transistor being configured to receive a third initialization signal during the data holding phase, and the low-frequency initialization transistor being configured to initialize the driving transistor according to the third initialization signal, so that the fluctuation values of the driving current during the data refreshing phase and the data holding phase are within a preset range.
A control method of a pixel drive circuit for controlling the pixel drive circuit as described above, the control method comprising:
the pixel driving circuit is configured to be in a data refreshing stage, and a data signal is output to a first pole of the driving transistor and used for controlling the light-emitting brightness of the light-emitting device;
and configuring the pixel driving circuit to be in a data holding stage, and outputting a third initialization signal to the first pole of the low-frequency initialization transistor so that the low-frequency initialization transistor initializes the driving transistor according to the third initialization signal.
A display screen, comprising:
a pixel drive circuit as described above;
and the light-emitting device is connected with the pixel driving circuit and used for receiving the driving current output by the pixel driving circuit and emitting light under the control of the driving current.
A display device comprising a display screen as described above.
The pixel driving circuit, the data refreshing stage and the data maintaining stage are two adjacent stages in time sequence, and the pixel driving circuit is used for driving the light emitting device to display the same brightness in the data refreshing stage and the data maintaining stage. In the data refresh phase, after the driving transistor receives the data signal, a corresponding driving current may be generated according to a voltage value of the data signal, and the light emitting device may be driven to emit light. The fluctuation value of the driving current needs to be kept within a preset range so as to avoid the fluctuation of the driving current from causing the brightness of the light-emitting device to change greatly. However, the operating state of the driving transistor may change with time, which results in a change in the driving current, and therefore, in the embodiment of the present application, the low frequency initialization transistor can reset the driving transistor in the data holding stage to compensate for the change in the operating state of the driving transistor, so that the driving current output by the driving transistor is kept stable, and the display stability of the display device in the low frequency display state is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a circuit diagram of a pixel driving circuit according to an embodiment;
fig. 2 is a graph showing a luminance change in a low frequency refresh period of the light emitting device driven when the low frequency initializing transistor T8 is not provided in the driving circuit;
FIG. 3 is a graph of luminance change of a light emitting device driven by a pixel driving circuit in a low frequency refresh period according to an embodiment;
FIG. 4 is a second circuit diagram of a pixel driving circuit according to an embodiment;
FIG. 5 is a third circuit diagram of a pixel driving circuit according to an embodiment;
FIG. 6 is a timing diagram of the pixel driving circuit of the embodiment of FIG. 5 during a data holding phase;
FIG. 7 is a timing diagram of the pixel driving circuit of FIG. 5 during a data refresh phase;
FIG. 8 is a fourth circuit diagram of a pixel driving circuit according to an embodiment;
FIG. 9 is a timing diagram of the pixel driving circuit of the embodiment of FIG. 8 during a data holding phase;
FIG. 10 is a timing diagram of the pixel driving circuit of FIG. 8 during a data refresh phase.
Detailed Description
To facilitate an understanding of the embodiments of the present application, the embodiments of the present application will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. The embodiments of the present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this application belong. The terminology used herein in the description of the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the embodiments of the present application, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on methods or positional relationships shown in the drawings, and are only used for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the embodiments of the present application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, the first Scan signal Scan1 may be referred to as the second Scan signal Scan2, and similarly, the second Scan signal Scan2 may be referred to as the first Scan signal Scan1 without departing from the scope of the present application. Both the first Scan signal Scan1 and the second Scan signal Scan2 are Scan signals, but they are not the same Scan signal.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present application, "a number" means at least one, such as one, two, etc., unless specifically limited otherwise.
The pixel driving circuit of the embodiment of the application is used for driving the light emitting device in the display device to emit light, so that the display device displays a target picture. The display device may be a smartphone, a tablet, a gaming device, an Augmented Reality (AR) device, a notebook, a desktop computing device, a wearable device, or the like. For convenience of understanding, the display device is exemplified as a mobile phone in the following.
Each Light Emitting device in the present embodiment may be, but is not limited to, an Organic Light-Emitting diode (OLED), a Quantum Dot Light Emitting diode (QLED), a Micro Light Emitting diode (Micro LED), a submillimeter Light Emitting diode (mini LED), and the like. In addition, the embodiments of the present application are described by taking the light emitting device as an organic light emitting diode OLED as an example. The display device has a low frequency display mode and a high frequency display mode, and the refresh rate in the low frequency display mode is less than the refresh rate in the high frequency display mode. The phenomenon of vision persistence exists in human eyes, and the phenomenon that when the human eyes observe a scene, an optical signal is transmitted into a brain, and after the action of the optical signal is finished, a visual image does not disappear immediately is referred to as the vision persistence. The duration of persistence of vision is specifically 0.1s-0.4 s. Further, if the switching speed of two adjacent frames of images is too slow, the switching process is captured by human eyes and is perceived as the images flicker. Therefore, the refresh rate of the display device is larger than the threshold frequency that can be captured by human eyes, which is usually about 25fps, and correspondingly, the switching interval between two adjacent frames is about 0.04 s. Therefore, if the time interval between two adjacent frames of images with changes is greater than 0.04s, the display device can be controlled to be in the high-frequency display mode to provide a smooth display picture; if the time interval between two adjacent frames of images with changes is less than or equal to 0.04s, the display device can be controlled to be in the low-frequency display mode to reduce the power consumption of the display device. It should be noted that the above switching interval threshold of 0.04s is only used for illustration, and in other embodiments, the switching interval threshold may be 0.03s, 0.035s, and the like, which is not limited in this embodiment.
The processor in the display device can flexibly configure the display mode based on the above conditions to achieve the balance between the display quality and the power consumption. For example, the low-frequency display mode may be applied to screen-off display of the mobile phone, where screen-off display refers to displaying information such as current time and power when the mobile phone is in a standby state. The user typically views the phone for a long time while using the phone, so the phone may be configured to a high frequency display mode on a regular basis, and when conditions are met, the processor configures the phone to a low frequency display mode. For another example, the low frequency display mode may also be applied to wearable devices such as smartwatches, smartbands, etc., which are not usually viewed by the user for a long time, and thus the wearable device may be configured to the low frequency display mode conventionally, and when the condition is satisfied, the processor configures the wearable device to the high frequency display mode.
Here, the refresh rate in the high frequency display mode may be understood as the highest refresh rate that the display device can support. Further, the display device may have a plurality of low frequency display modes different in refresh rate, and may be configured as a low frequency display mode corresponding to the refresh rate according to the situation of the display screen. Therefore, in the embodiment of the present application, the display modes having the refresh rate less than the highest refresh rate that can be supported by the display device are collectively referred to as the low-frequency display mode, and the refresh rate in the low-frequency display mode is not specifically limited. And the pixel driving circuit is alternately in the data refreshing phase and the data holding phase in the low-frequency display mode, and the pixel driving circuit is continuously in the data refreshing phase in the high-frequency display mode. It can be understood that, when the display device is in the high frequency display mode, taking the refresh rate of 120Hz as an example, each pixel needs to update the data signal every 0.0083 seconds, if the data refresh phase and the data hold phase need to be configured additionally for the high frequency display mode, 0.0083 seconds need to be subdivided into two phases, and the refresh rate in the high frequency display mode is the highest refresh rate that the display device can support, that is, the above-mentioned division cannot be supported, so the pixel driving circuit is continuously in the data refresh phase in the high frequency display mode. Fig. 1 is one of circuit diagrams of a pixel driving circuit of an embodiment, and referring to fig. 1, the pixel driving circuit includes a driving transistor T1 and a low frequency initialization transistor T8. For convenience of illustration, the embodiment of the present application further illustrates a light emitting device OLED connected to the pixel driving circuit, an anode of the light emitting device OLED for receiving the driving current output by the pixel driving circuit, a cathode of the light emitting device OLED connected to a first power voltage terminal ELVSS, which may have a voltage of 0V to-5V, for example, and the light emitting device OLED for emitting light under the driving of the driving current. The control electrode of the driving transistor T1 is configured to receive a Data signal Data during a Data refresh phase and generate a driving current according to the Data signal Data, and the second electrode of the driving transistor T1 is configured to output the driving current to the light emitting device OLED through the second electrode of the driving transistor T1 during the Data refresh phase and the Data hold phase, so as to drive the light emitting device OLED to emit light. In the embodiment shown in fig. 1, the first electrode of the driving transistor T1 is connected to the second power voltage terminal ELVDD, and the control electrode of the driving transistor T1 is used for receiving the Data signal Data, but it is understood that the driving transistor T1 may be connected in other manners in other embodiments.
The low-frequency display mode is provided with a data refreshing stage and a data keeping stage, wherein the data refreshing stage and the data keeping stage are two adjacent stages in time sequence. The pixel driving circuit needs to drive the light emitting device OLED to display the same luminance in one low frequency refresh period, which may be understood as a period in which an image of the display device is not changed. The driving transistor T1 has a first pole and a second pole, and in the Data refresh phase, after the driving transistor T1 receives the Data signal Data, the driving transistor T can generate a corresponding driving current according to the voltage of the Data signal Data, and drive the light emitting device OLED to emit light. In the Data holding phase, the driving transistor T1 does not receive the Data signal Data, and should hold the driving current at this time the same as the driving current at the Data refresh phase to continuously drive the light emitting device OLED to stably emit light. Therefore, in the two phases, the fluctuation value of the driving current needs to be kept within a preset range to avoid the fluctuation of the driving current from causing the brightness of the light emitting device OLED to change greatly.
The preset range is positively correlated with the displayed gray scale value, and the larger the gray scale value is, the larger the preset range is. For example, if the gray scale value to be displayed currently is 32, the brightness change of about 0.05nit can be perceived by human eyes, and the preset range needs to be set to 0nit-0.05 nit; if the current gray scale value to be displayed is 223, the brightness variation of about 1.38nit can be detected by human eyes, and the preset range needs to be set to 0nit-1.38 nit.
However, during the data retention phase, the voltage external to the driving transistor T1 may cause the output characteristic curve of the transistor to drift. When the transistor operates in the saturation region, the output characteristic curve determines the output current of the transistor, i.e., the driving current of the driving transistor T1. Therefore, if the output characteristic curve of the driving transistor T1 drifts, the driving current output from the driving transistor T1 also changes, and accordingly, the luminance of the light emitting device OLED also changes. The above-mentioned variation is generally manifested as a rise in the driving current of the driving transistor T1 due to leakage, i.e., a rise in the luminance of the light emitting device OLED as shown in fig. 2, and a luminance variation in one low frequency refresh period when the low frequency initialization transistor T8 is not provided is shown in fig. 2. Illustratively, if the light emitting device OLED needs to provide 0nit of brightness in two adjacent low-frequency refresh periods, but the brightness gradually increases to 1nit in the data retention phase of the first low-frequency refresh period, the brightness will be restored to 0nit again in the data refresh phase of the next low-frequency refresh period, and the flicker phenomenon appears to the user, thereby affecting the viewing experience of the user.
In this embodiment, a first pole of the low frequency initialization transistor T8 is connected to a first pole of the driving transistor T1, a second pole of the low frequency initialization transistor T8 is configured to receive a third initialization signal Vinit3 during the data holding phase, and the low frequency initialization transistor T8 is configured to initialize the driving transistor T1 according to the third initialization signal Vinit3, so that the fluctuation values of the driving current during the data refreshing phase and the data holding phase are within a preset range. The voltage range of the third initialization signal Vinit3 is determined according to the voltage range of the Data signal Data, and the voltage range of the third initialization signal Vinit3 may be, for example, 0V to 6.5V. Specifically, the low frequency initialization transistor T8 can reset the driving transistor T1 in the data holding phase to compensate for the change in the operating state of the driving transistor T1. That is, the driving transistor T1 is corrected to the state before the drift occurs, and the output characteristic curve of the driving transistor T1 is restored such that the driving current output from the driving transistor T1 becomes the target driving current, i.e., the current corresponding to the Data signal Data received in the Data refresh phase. More preferably, the voltage of the third initialization signal Vinit3 may be, for example, 5.6V, so as to adapt to the device performance of the driving transistor T1 and the voltage of the Data signal Data to achieve optimal compensation for the state drift of the driving transistor T1, thereby reducing the variation in luminance of the light emitting device to a greater extent. Based on the pixel driving circuit, the light emitting device OLED can continuously provide the correct light emitting luminance as shown in fig. 3 in one low frequency refresh period, thereby improving the display stability of the display device in the low frequency display state.
Fig. 4 is a second circuit diagram of the pixel driving circuit according to an embodiment, and referring to fig. 4, in this embodiment, the data refresh phase includes a compensation writing sub-phase, and the pixel driving circuit further includes a second transistor T2 and a storage capacitor C1.
A first pole of the second transistor T2 is used for receiving the Data signal Data, a second pole of the second transistor T2 is connected with a first pole of the driving transistor T1, and the second transistor T2 is used for turning on in the compensation writing sub-phase to transmit the Data signal Data to the first pole of the driving transistor T1. Specifically, a control electrode of the second transistor T2 is used to receive the third Scan signal Scan3, and the second transistor T2 is turned on and off under the control of the third Scan signal Scan 3. Taking the second transistor T2 as an example of a P-type transistor, when the signal of the third Scan signal Scan3 is at a low level, the second transistor T2 is turned on and transmits the Data signal Data to the first electrode of the driving transistor T1; when the signal of the third Scan signal Scan3 is at a low level, the second transistor T2 is turned off. By providing the second transistor T2, the on/off of the receiving path of the Data signal Data can be flexibly controlled, thereby reducing the complexity when the external processor outputs the Data signal Data. In addition, the second transistor T2 can isolate different pixel driving circuits to suppress signal interference between different pixel driving circuits and improve the stability of the pixel driving circuits.
The storage capacitor C1 is connected to the first power voltage terminal ELVDD and the control electrode of the driving transistor T1, respectively, the storage capacitor C1 is used to store charges during the compensation writing sub-phase, and the amount of the stored charges is positively correlated to the voltage of the Data signal Data. Specifically, by providing the storage capacitor C1, the Data signal Data can be stored, so that the Data signal Data line can transmit the Data signal Data to different pixel driving circuits in a time-sharing manner, and the pixel driving circuits can control the driving transistor T1 to output a stable driving current according to the charges stored in the storage capacitor C1 when the Data signal Data is not received.
Fig. 5 is a third circuit diagram of a pixel driving circuit according to an embodiment, and referring to fig. 5, in the present embodiment, the pixel driving circuit further includes a seventh transistor T7. A first pole of the seventh transistor T7 is connected to the anode of the light emitting device OLED, a second pole of the seventh transistor T7 is used to receive a second initialization signal Vinit2 during the data holding period, and the seventh transistor T7 is used to initialize the anode of the light emitting device OLED according to the second initialization signal Vinit 2. Specifically, the control electrode of the seventh transistor T7 is configured to receive the second Scan signal Scan2, and the seventh transistor T7 is configured to transmit the second initialization signal Vinit2 to the anode of the light emitting device OLED under the control of the second Scan signal Scan2 for initialization. In particular, the second initialization signal Vinit2 is capable of pulling down the anode of the light emitting device OLED to a second initialization voltage, which may be understood as an anode start charging voltage of the light emitting device OLED, which may be, for example, 0V to-5V. In this embodiment, by initializing the anode of the light emitting device OLED, the charge stored in the parasitic capacitance of the light emitting device OLED can be released, thereby ensuring the reliability of the light emission luminance of the light emitting device OLED in the data holding phase.
Fig. 6 is a timing diagram of the pixel driving circuit in the data holding phase in the embodiment of fig. 5, referring to fig. 6, T4 is an initialization sub-phase (referred to as a first initialization sub-phase) of the data holding phase, T5 is a light emitting sub-phase (referred to as a first light emitting sub-phase) of the data holding phase, and after the initialization of the driving transistor T1 and the light emitting device OLED is completed in the first initialization sub-phase, the pixel driving circuit can output a stable target driving current in the first light emitting sub-phase. Moreover, in the present embodiment, the initialization operation is also controlled by the timing of the emission control signal EM, that is, the initialization operation is performed only when the output path of the emission control signal EM controlling the driving current is disconnected, so that more flexible and accurate initialization can be performed. In addition, the third initialization signal terminal does not need to be multiplexed to transmit other data signals, so that interference of other signals to the third initialization signal Vinit3 can be avoided, and the initialization period can be selected more flexibly without being limited by the transmission cycle of other signals.
With continued reference to fig. 6, in one embodiment, the time when the seventh transistor T7 initializes the anode of the light emitting device OLED corresponds to the time when the low frequency initialization transistor T8 initializes the driving transistor T1. Here, the time correspondence may be understood as that the seventh transistor T7 and the low frequency initialization transistor T8 perform the corresponding initialization operations at the same time. Specifically, the seventh transistor T7, which is controlled by the second Scan signal Scan2, is turned on in synchronization with the low frequency initialization transistor T8, which is controlled by the fourth Scan signal Scan 4. It can be understood that, if the scan signals with the same time sequence are adopted, the generation logic of the scan signals is simpler.
Further, the seventh transistor T7 and the low frequency initialization transistor T8 are turned on or off under the control of the same scan signal to implement the synchronous initialization function. Still further, the display module may include a first gate control module, the first gate control module is respectively connected to the control electrode of the seventh transistor T7 and the control electrode of the low frequency initialization transistor T8, and the first gate control module is configured to generate a scan signal and respectively transmit the scan signal to the seventh transistor T7 and the low frequency initialization transistor T8, so as to simplify the number of gate control modules in the display module.
With continued reference to fig. 5, in one embodiment, the pixel driving circuit further includes a third transistor T3. A first pole of the third transistor T3 is connected to the second pole of the driving transistor T1, a second pole of the third transistor T3 is connected to the control pole of the driving transistor T1, and the third transistor T3 is turned on in the compensation writing sub-phase to compensate the driving transistor T1. Specifically, a control electrode of the third transistor T3 is for receiving the third Scan signal Scan3, and the third transistor T3 is for being turned on and off under the control of the third Scan signal Scan 3. Wherein the amount of charge stored by the storage capacitor C1 is positively correlated with a voltage difference value between the voltage of the Data signal Data and the threshold voltage of the driving transistor T1. Specifically, taking the third transistor T3 as a P-type transistor as an example, when the signal of the third Scan signal Scan3 is at a low level, threshold compensation is performed and the storage capacitor C1C1 is charged, so that the compensation result is stored in the storage capacitor C1C 1.
Alternatively, as shown in fig. 5, the third transistor T3 may be a double gate transistor. In the present embodiment, the third transistor T3 with the double-gate transistor structure is adopted, so that the reliability of threshold compensation can be effectively improved, and the display quality of the display device can be improved. It is understood that other transistors in the pixel driving circuit can be double-gate transistors to further improve the display quality.
In one embodiment, the second pole of the seventh transistor T7 is further used for receiving the second initialization signal Vinit2 in the compensation writing sub-phase, and the seventh transistor T7 is further used for initializing the anode of the light emitting device OLED in the compensation writing sub-phase. In particular, the second initialization signal Vinit2 is capable of pulling down the anode of the light emitting device OLED to a second initialization voltage, which may be understood as an anode start charging voltage of the light emitting device OLED, which may be, for example, 0V to-5V. In this embodiment, by initializing the anode of the light emitting device OLED, the charges stored in the parasitic capacitance of the light emitting device OLED can be released, thereby ensuring the reliability of the light emitting luminance of the light emitting device OLED in the data refresh phase.
Fig. 7 is a timing diagram of the pixel driving circuit in the embodiment of fig. 5 during the data refreshing phase, and referring to fig. 7, in one embodiment, the data refreshing phase further includes an initialization sub-phase before the compensation writing sub-phase, T1 is the initialization sub-phase (referred to as the second initialization sub-phase) of the data refreshing phase, T2 is the compensation writing sub-phase of the data refreshing phase, and T3 is the light emitting sub-phase (referred to as the second light emitting sub-phase) of the data refreshing phase.
With continued reference to fig. 5, the pixel driving circuit further includes a fourth transistor T4, a first pole of the fourth transistor T4 is connected to the control electrode of the driving transistor T1, a second pole of the fourth transistor T4 is configured to receive a first initialization signal Vinit1, the first initialization signal Vinit1 may be-3V to-5V, for example, and the fourth transistor T4 is configured to initialize the control electrode of the driving transistor T1 in the initialization sub-phase. Specifically, the gate is used for receiving the first Scan signal Scan1, and the fourth transistor T4 is used for being turned on and off under the control of the first Scan signal Scan 1. The first initialization signal Vinit1 can pull down the control voltage of the driving transistor T1 to the first initialization, and release the charges accumulated in the driving transistor T1 in the last low frequency refresh period, thereby improving the accuracy of the driving current. After the initialization of the driving transistor T1 is completed in the second initialization sub-phase, the Data signal Data is written in the compensation writing sub-phase and the threshold voltage of the driving transistor T1 is compensated, so that an accurate driving current can be supplied in the second light emitting sub-phase. Alternatively, the fourth transistor T4 may be a double gate transistor. In the present embodiment, the fourth transistor T4 with the double-gate transistor structure is adopted, so that the reliability of gate initialization can be effectively improved, and the display quality of the display device can be improved.
With continued reference to fig. 5, in one embodiment, the pixel driving circuit further includes a fifth transistor T5 and a sixth transistor T6.
A first pole of the fifth transistor T5 is connected to a power voltage terminal, and more particularly to a first power voltage terminal ELVDD, a second pole of the fifth transistor T5 is connected to a first pole of the driving transistor T1, a second pole of the fifth transistor T5 is connected to an anode of the light emitting device OLED, and the fifth transistor T5 is configured to turn on in the emission sub-phase, so that the driving transistor T1 generates the driving current according to the charge stored in the storage capacitor C1 and the voltage of the first power voltage terminal ELVDD. The fifth transistor T5 is for controlling the on/off of a signal transmission path between the second power supply voltage terminal ELVSS and the first pole of the driving transistor T1 according to the emission control signal EM. A first pole of the sixth transistor T6 is connected to the second pole of the driving transistor T1, and the sixth transistor T6 is configured to turn on during the light emitting sub-period, so that the driving transistor T1 outputs the driving current to the anode of the light emitting device OLED. A control electrode of the sixth transistor T6 is for receiving the emission control signal EM, a first electrode of the sixth transistor T6 is connected to the second electrode of the driving transistor T1, an anode of the second light emitting device OLED of the sixth transistor T6 is connected, and the sixth transistor T6 is for controlling the on/off of a signal transmission path between the second electrode of the driving transistor T1 and the anode of the light emitting device OLED according to the emission control signal EM. Illustratively, taking the fifth transistor T5 and the sixth transistor T6 as P-type transistors as an example, when the light emission control signal EM is at a low level, the fifth transistor T5 and the sixth transistor T6 are turned on, the voltage of the first electrode of the driving transistor T1 is pulled up to the second power voltage ELVDD, which may be 4.6V, for example, and the voltage difference between the gate and the source of the first driving transistor T1 varies, so that a driving current is generated and output to the light emitting device OLED, thereby controlling the light emitting device OLED to emit light.
Fig. 8 is a fourth circuit diagram of the pixel driving circuit according to the embodiment, fig. 9 is a timing diagram of the pixel driving circuit according to the embodiment of fig. 8 in a data holding phase, and fig. 10 is a timing diagram of the pixel driving circuit according to the embodiment of fig. 8 in a data refreshing phase. Referring to fig. 8, at least one of the third transistor T3 and the fourth transistor T4 is an oxide thin film transistor in transistor type, and in the embodiment shown in fig. 8, the third transistor T3 and the fourth transistor T4 are both oxide thin film transistors, but in other embodiments, only one of the third transistor T3 and the fourth transistor T4 may be an oxide thin film transistor. The oxide thin film transistor has better performance of inhibiting electric leakage. That is, the third transistor T3 and the fourth transistor T4 in fig. 5 are replaced with oxide thin film transistors from low temperature polysilicon thin film transistors, so that the purpose of controlling leakage current can be achieved. However, it is understood that the driving capability of the ltps tft is stronger than that of the oxide tft, and therefore, in other embodiments, other switch transistors may be configured as the oxide tft, and the driving transistor T1 is maintained as the ltps tft, so as to ensure the driving capability of the driving transistor T1.
Referring to fig. 9 and 10 in combination, when the third transistor T3 and the fourth transistor T4 are oxide thin film transistors, the enabling manner of the scan signals of the third transistor T3 and the fourth transistor T4 needs to be adjusted to ensure the correct on/off of the third transistor T3 and the fourth transistor T4. Specifically, the third transistor T3 and the fourth transistor T4 are both high-level enabled. Therefore, in the present embodiment, the fourth transistor T4 is controlled by the first N-type scan signal NScan1, the third transistor T3 is controlled by the second N-type scan signal NScan2, the seventh transistor T7 is controlled by the first P-type scan signal PScan1, the second transistor T2 is controlled by the second P-type scan signal PScan2, and the low frequency initialization transistor T8 is controlled by the third P-type scan signal. It is understood that the switching timing of each transistor in this embodiment is the same as that in the previous embodiment, and is not described herein again.
The embodiment of the present application further provides a control method of a pixel driving circuit, which is used for controlling the pixel driving circuit, and the control method includes: configuring the pixel driving circuit to be in a Data refreshing phase, and outputting a Data signal Data to a first pole of a driving transistor T1, wherein the Data signal Data is used for controlling the light-emitting brightness of a light-emitting device; the pixel driving circuit is configured to be in a data holding phase, and a third initialization signal Vinit3 is output to the first pole of the low frequency initialization transistor T8, so that the low frequency initialization transistor T8 initializes the driving transistor T1 according to the third initialization signal Vinit 3. Based on the pixel driving circuit, the control method of the embodiment enables the pixel driving circuit to output a stable driving current, thereby ensuring that the light emitting device has stable light emitting brightness in a low frequency refresh period.
The embodiment of the present application further provides a display screen, including: a pixel drive circuit as described above; and the light-emitting device is connected with the pixel driving circuit and used for receiving the driving current output by the pixel driving circuit and emitting light under the control of the driving current. Based on the pixel driving circuit, the display screen of the embodiment can have stable display brightness in a low-frequency display mode, so that the viewing experience of a user is improved.
An embodiment of the present application further provides a display device, including: such as the display screen described above. Based on the display screen, the display device of the embodiment can have stable display brightness in the low-frequency display mode, so that the viewing experience of a user is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express a few embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the concept of the embodiments of the present application, and these embodiments are within the scope of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the appended claims.
Claims (14)
1. A pixel driving circuit, comprising:
the driving transistor is provided with a first pole and a second pole, the driving transistor is used for receiving a data signal in a data refreshing stage and generating a driving current according to the data signal, and the second pole is used for outputting the driving current to a light-emitting device in the data refreshing stage and a data maintaining stage so as to drive the light-emitting device to emit light;
a low-frequency initialization transistor, a first pole of the low-frequency initialization transistor being connected to the first pole of the driving transistor, a second pole of the low-frequency initialization transistor being configured to receive a third initialization signal during the data holding phase, and the low-frequency initialization transistor being configured to initialize the driving transistor according to the third initialization signal, so that the fluctuation values of the driving current during the data refreshing phase and the data holding phase are within a preset range.
2. The pixel driving circuit according to claim 1, further comprising:
a seventh transistor, a first pole of the seventh transistor being connected to the anode of the light emitting device, a second pole of the seventh transistor being configured to receive a second initialization signal during the data holding phase, and the seventh transistor being configured to initialize the anode of the light emitting device according to the second initialization signal.
3. The pixel driving circuit according to claim 2, wherein the seventh transistor and the low frequency initialization transistor are turned on or off under control of a same scan signal during the data holding period.
4. The pixel driving circuit according to claim 2, wherein the data refresh phase comprises a compensated write sub-phase, the pixel driving circuit further comprising:
a second transistor, a first pole of the second transistor is used for receiving the data signal, a second pole of the second transistor is connected with a first pole of the driving transistor, and the second transistor is used for conducting in the compensation writing sub-phase so as to transmit the data signal to the first pole of the driving transistor;
and the storage capacitor is respectively connected with a power supply voltage end and the control electrode of the driving transistor, and is used for storing electric charge in the compensation writing sub-stage, and the stored electric charge quantity is positively correlated with the voltage of the data signal.
5. The pixel driving circuit according to claim 4, further comprising:
a third transistor, a first pole of the third transistor is connected with a second pole of the driving transistor, a second pole of the third transistor is connected with a control pole of the driving transistor, and the third transistor is used for conducting in the compensation writing sub-phase so as to compensate the driving transistor;
wherein the amount of charge stored by the storage capacitor is positively correlated with a voltage difference value, which is a difference between the voltage of the data signal and the threshold voltage of the driving transistor.
6. The pixel driving circuit according to claim 5, wherein at least one of the third transistor, the seventh transistor, and the low frequency initialization transistor is an oxide thin film transistor.
7. The pixel driving circuit according to claim 4, wherein the second pole of the seventh transistor is further configured to receive the second initialization signal during the compensation writing sub-phase, and the seventh transistor is further configured to initialize the anode of the light emitting device during the compensation writing sub-phase.
8. The pixel driving circuit according to claim 4, wherein the data refresh phase further comprises a light emission sub-phase following the compensation write sub-phase, the pixel driving circuit further comprising:
a fifth transistor, a first electrode of which is connected to the power supply voltage terminal, a second electrode of which is connected to the first electrode of the driving transistor, and the fifth transistor is configured to be turned on in the light emission sub-phase, so that the driving transistor generates the driving current according to the charge stored in the storage capacitor and the voltage of the power supply voltage terminal;
a sixth transistor, a first pole of the sixth transistor being connected to the second pole of the driving transistor, a second pole of the fifth transistor being connected to the anode of the light emitting device, the sixth transistor being configured to be turned on during the light emitting sub-phase, so that the driving transistor outputs the driving current to the anode of the light emitting device.
9. The pixel driving circuit according to claim 4, wherein the data refresh phase further comprises an initialization sub-phase preceding the compensation writing sub-phase, the pixel driving circuit further comprising:
a fourth transistor, a first electrode of the fourth transistor being connected to the control electrode of the driving transistor, a second electrode of the fourth transistor being configured to receive a first initialization signal, and the fourth transistor being configured to initialize the control electrode of the driving transistor in the initialization sub-phase.
10. The pixel driving circuit according to any one of claims 1 to 9, wherein the pixel driving circuit has a low frequency display mode and a high frequency display mode, the pixel driving circuit is alternately in the data refresh phase and the data hold phase in the low frequency display mode, and the pixel driving circuit is continuously in the data refresh phase in the high frequency display mode.
11. The pixel driving circuit according to any one of claims 1 to 9, wherein the voltage range of the third initialization signal is 0V to 6.5V.
12. A control method for a pixel drive circuit, for controlling the pixel drive circuit according to any one of claims 1 to 11, the control method comprising:
the pixel driving circuit is configured to be in a data refreshing stage, and a data signal is output to a first pole of the driving transistor and used for controlling the light-emitting brightness of the light-emitting device;
and configuring the pixel driving circuit to be in a data holding stage, and outputting a third initialization signal to the first pole of the low-frequency initialization transistor so that the low-frequency initialization transistor initializes the driving transistor according to the third initialization signal.
13. A display screen, comprising:
a pixel driving circuit according to any one of claims 1 to 11;
and the light-emitting device is connected with the pixel driving circuit and used for receiving the driving current output by the pixel driving circuit and emitting light under the control of the driving current.
14. A display device characterized in that it comprises a display screen according to claim 13.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111254970.0A CN113793568A (en) | 2021-10-27 | 2021-10-27 | Pixel driving circuit, control method thereof, display screen and display device |
| PCT/CN2022/121974 WO2023071677A1 (en) | 2021-10-27 | 2022-09-28 | Pixel driving circuit and control method therefor, and display screen and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111254970.0A CN113793568A (en) | 2021-10-27 | 2021-10-27 | Pixel driving circuit, control method thereof, display screen and display device |
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| CN113793568A true CN113793568A (en) | 2021-12-14 |
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| CN202111254970.0A Pending CN113793568A (en) | 2021-10-27 | 2021-10-27 | Pixel driving circuit, control method thereof, display screen and display device |
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| WO (1) | WO2023071677A1 (en) |
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| CN114446238A (en) * | 2022-01-26 | 2022-05-06 | 合肥维信诺科技有限公司 | Pixel driving circuit, driving method and display device |
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