CN114974080A - Display panel and display device - Google Patents
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- 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
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- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The application provides a display panel and display device, includes: the pixel circuit comprises a driving transistor, the drain electrode of the driving transistor is connected with the light-emitting element and used for providing driving current for the light-emitting element, the display panel has a first mode and a second mode, each display period in the second mode comprises a data writing frame and at least one data holding frame, a data signal is received by the source electrode of the driving transistor in the data writing frame, the driving transistor provides the driving current for the light-emitting element according to the driving signal, after the first mode is switched to the second mode, the voltage value of the data signal of the first data writing frame in the second mode is different from the voltage value of the data signal of other data writing frames in the second mode, the first display period in the second mode and the brightness of other display periods in the second mode tend to be consistent, and therefore under the scene that different-frequency driving is switched, flicker of the display panel is avoided.
Description
Technical Field
The present invention relates to the field of display, and in particular, to a display panel and a display device.
Background
At present, display panels have penetrated into various aspects of people's daily life, for example, the display panels are used as display interaction modules of various display devices for users to correspondingly watch. The display panel can display in different application scenes by adopting different image refresh rates, for example, a driving (also called high-frequency driving) mode with a higher image refresh rate is adopted to drive and display a dynamic picture so as to ensure the fluency of the picture; and a driving mode with a low image refresh rate (also called low-frequency driving) is adopted to drive and display a slow-shot image or a static picture so as to reduce power consumption. When the picture is not updated, the display panel can be switched from a high image refresh rate state to a low image refresh rate state to reduce power consumption; when the picture is updated, the display panel can be switched from a low image refresh rate state to a high image refresh rate state, so that the balance of smooth picture and low power consumption is realized. However, in a scene where the image refresh rate state is switched, the display panel has a problem that luminance change is abnormal, and the display panel flickers, which seriously affects user experience.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a display panel and a display device, which ensure that the brightness of the display panel is kept stable and flicker is not generated when switching from high frequency driving to low frequency driving.
An embodiment of the present application provides a display panel, including: a pixel circuit and a light emitting element;
the pixel circuit comprises a driving transistor, wherein the drain electrode of the driving transistor is connected with the light-emitting element and used for providing driving current for the light-emitting element;
the display panel has a first mode and a second mode, each display period in the second mode including one data write frame and at least one data hold frame;
in the data writing frame, the source electrode of the driving transistor receives a data signal, and the driving transistor provides a driving current for the light-emitting element according to the driving signal; after the first mode is switched to the second mode, the voltage value of the data signal of the first data writing frame in the second mode is different from the voltage value of the data signal of other data writing frames in the second mode;
in the data holding frame, the source of the driving transistor does not receive a data signal, the driving transistor does not provide a driving current for the light emitting element, the source of the driving transistor receives a holding signal, and the holding signal is greater than the data signal.
The embodiment of the application also provides a display device which comprises the display panel.
The embodiment of the application provides a display panel and a display device, the display panel comprises a pixel circuit and a light-emitting element, the pixel circuit comprises a driving transistor, the drain electrode of the driving transistor is connected with the light-emitting element and used for providing driving current for the light-emitting element, the display panel has a first mode and a second mode, each display period in the second mode comprises a data writing frame and at least one data retaining frame, in the data writing frame, the source electrode of the driving transistor receives a data signal, the driving transistor provides driving current for the light-emitting element according to the driving signal, in the data retaining frame, the source electrode of the driving transistor does not receive the data signal, the driving transistor does not provide driving current for the light-emitting element, and the source electrode of the driving transistor receives the retaining signal which is larger than the data signal. After switching from the first mode to the second mode, since a drift of the driving transistor characteristics occurs in the data holding frame, which drift is compensated for in the second data writing frame in the second mode, a change in luminance easily occurs in the first display period in the second mode, and luminance is restored in the second display period, so that the display panel flickers after frequency switching.
Therefore, in the embodiment of the present application, the voltage value of the data signal of the first data write frame in the second mode may be set to be different from the voltage value of the data signal of the other data write frame in the second mode, so that by setting the voltage value of the data signal of the first data write frame in the second mode in a targeted manner, the threshold voltage of the driving transistor can be compensated, the display luminance of the first display period in the second mode is compensated, and the luminance of the display panel in the first display period in the second mode and the luminance of the other display periods in the second mode tend to be consistent, so that the luminance of the display panel is kept stable all the time in a scene where different frequency driving is switched, and flicker of the display panel is avoided.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram showing the brightness variation of a display panel during switching from high frequency driving to low frequency driving;
fig. 2 is a schematic structural diagram of a display panel provided in an embodiment of the present application;
FIG. 3 is a diagram illustrating a display period of a second mode according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating gray scales of a display panel and corresponding brightness variations of the display panel according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram illustrating a gray scale of a display panel and a corresponding brightness variation of the display panel according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating a gray scale of a display panel and a corresponding brightness variation of the display panel according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another display panel provided in an embodiment of the present application;
fig. 8 is a schematic structural diagram illustrating a further display panel provided in an embodiment of the present application;
FIG. 9 is a schematic top view of a display panel according to an embodiment of the present application;
FIG. 10 is a schematic cross-sectional view along AA' of the display panel of FIG. 9;
FIG. 11 shows another schematic cross-sectional view along AA' of the display panel of FIG. 9;
fig. 12 illustrates a display device provided in an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited by the specific embodiments disclosed below.
Next, the present application will be described in detail with reference to the drawings, and in the detailed description of the embodiments of the present application, the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration, and the drawings are only examples, which should not limit the scope of the protection of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
When a certain picture is displayed on the display panel, a certain picture display time needs to be set so as to ensure that a viewer can fully realize visual retention, and therefore a continuous animation effect is formed when a plurality of pictures are refreshed. Therefore, for each picture displayed by the display panel, a display period needs to be set, in one display period, a plurality of frames are set, and the plurality of frames are played in sequence, so that smooth display of the picture is realized.
Currently, when a picture is not updated, the display panel may be switched from high frequency driving to low frequency driving to reduce power consumption. In the high-frequency driving mode, a plurality of frames in the display period can be all data writing (Refresh) frames, and data signals corresponding to a display picture are written into the pixel circuit in the data writing frames to drive display; in the low-frequency driving mode, a plurality of frames in the display period comprise a data writing frame and at least one data Holding (Holding) frame, the data writing frame is used for providing data signals corresponding to a writing display picture to the pixel circuit to drive display, the data Holding frame does not write the data signals any more, the data signals stored in the data writing frame are displayed according to the received Holding signals, and the display picture of the data writing frame is held.
The inventor of the present invention has found that, after the display panel is switched from the first mode to the second mode, in the first data retention frame in the second mode, the source of the driving Transistor receives the retention signal, and when the driving Transistor is a Thin Film Transistor (TFT), due to the characteristics of the TFT, the TFT may cause the threshold voltage to drift under long-time gate bias application, and further cause the display panel to have reduced luminance, thereby causing the display panel to flicker.
Referring to fig. 1, a schematic diagram of luminance change of a display panel during switching from high frequency driving to low frequency driving is shown, where an abscissa is time in seconds and an ordinate is luminance, and during switching from a high image refresh rate of 120Hz to a low image refresh rate of 10Hz, luminance of the display panel is kept stable at the high image refresh rate, and after switching from high frequency driving to low frequency driving, luminance of the display panel in a first display period (about 1.5 s) under low frequency driving is lower than a stable value, the display panel flickers, and luminance returns to normal in a second display period under low frequency driving.
Based on this, the embodiment of the present application provides a display panel and a display device, the display panel includes a pixel circuit and a light emitting element, the pixel circuit includes a driving transistor, a drain of the driving transistor is connected to the light emitting element for providing a driving current for the light emitting element, the display panel has a first mode and a second mode, each display period in the second mode includes a data writing frame and at least one data holding frame, in the data writing frame, a source of the driving transistor receives a data signal, and the driving transistor provides the driving current for the light emitting element according to the driving signal, in the data holding frame, the source of the driving transistor does not receive the data signal, and the driving transistor does not provide the driving current for the light emitting element, and the source of the driving transistor receives a holding signal, and the holding signal is greater than the data signal. After switching from the first mode to the second mode, since a drift of the driving transistor characteristics occurs in the data holding frame, which drift is compensated for in the second data writing frame in the second mode, a change in luminance easily occurs in the first display period in the second mode, and luminance is restored in the second display period, so that the display panel flickers after frequency switching.
Therefore, in the embodiment of the present application, the voltage value of the data signal of the first data write frame in the second mode may be set to be different from the voltage value of the data signal of the other data write frame in the second mode, so that by setting the voltage value of the data signal of the first data write frame in the second mode in a targeted manner, the threshold voltage of the driving transistor can be compensated, the display luminance of the first display period in the second mode is compensated, and the luminance of the display panel in the first display period in the second mode and the luminance of the other display periods in the second mode tend to be consistent, so that the luminance of the display panel is kept stable all the time in a scene where different frequency driving is switched, and flicker of the display panel is avoided.
For a better understanding of the technical solutions and effects of the present application, specific embodiments will be described in detail below with reference to the accompanying drawings.
Referring to fig. 2, a schematic structural diagram of a display panel provided in the embodiment of the present disclosure is shown, where the display panel includes a pixel circuit 10 and a light emitting element 20; the pixel circuit 10 includes a driving transistor Mm having a data input terminal, a control terminal and a data output terminal, wherein the data input terminal is a source of the driving transistor Mm for inputting a data signal to the driving transistor Mm, and may be connected to the data signal input terminal S2, the data output terminal is a drain of the driving transistor Mm, and is connected to the light emitting element 20 for supplying a driving current to the light emitting element 20, the control terminal is a gate of the driving transistor Mm, and may be connected to the control signal input terminal S1 for controlling the driving transistor Mm to be turned on or off, and when the driving transistor Mm is turned on, the drain of the driving transistor may supply a driving current to the light emitting element.
The display panel has a first mode and a second mode, each display period of the display panel in the second mode can include a data writing frame and a data holding frame, when data is written into the frame, the display panel can be driven to emit light through a data signal, that is, in the data writing frame, the source of the driving transistor receives the data signal, and the driving transistor provides a driving current for the light-emitting element according to the driving signal so as to drive the display panel to display a picture; in the data holding frame, the source of the driving transistor does not receive the data signal, the driving transistor does not supply the driving current to the light emitting element, and the source of the driving transistor receives the holding signal and holds the display image when the data is written into the frame according to the holding signal.
In the embodiment of the present application, the hold signal is greater than the data signal, the voltage value of the data signal of the other data write frame in the second mode may range from 4 to 6V, and the voltage value of the hold signal may range from 6.5 to 7V. For example, the voltage value of the data signal of the other data write frame in the second mode may be 5V, and the voltage value of the hold signal may be 6.5V.
In the embodiment of the present application, each display period in the second mode may include one data write frame and at least one data hold frame. The image refresh rate of the second mode may be set by setting the number of data holding frames, the number of data holding frames in the display period in the second mode being inversely proportional to the image refresh rate in the second mode, i.e., the more data holding frames are set, the smaller the image refresh rate of the display panel in the second mode. For example, if the base refresh rate of the display panel is 120Hz, and each display period in the second mode includes 1, 2, 3, 4, 5, 7, 9, 11, 14, 19, 23, 29, 39, 59, or 119 data holding frames, the image refresh rate in the second mode can be adjusted to 60Hz, 40Hz, 30Hz, 24Hz, 20Hz, 15Hz, 12Hz, 10Hz, 8Hz, 6Hz, 5Hz, 4Hz, 3Hz, 2Hz, or 1Hz, respectively. Referring to fig. 3, a schematic diagram of a display period of the second mode according to the embodiment of the present application is shown, after a data write frame, there are N consecutive data holding frames, where N is an integer greater than 4.
After switching from the first mode to the second mode, since a drift of the driving transistor characteristics occurs in the data holding frame, which drift is compensated for in the second data writing frame in the second mode, a change in luminance easily occurs in the first display period in the second mode, and luminance is restored in the second display period, so that the display panel flickers after frequency switching.
In the embodiment of the present application, the voltage value of the data signal of the first data write frame in the second mode may be set to be different from the voltage value of the data signal of the other data write frame in the second mode, so that by setting the voltage value of the data signal of the first data write frame in the second mode in a targeted manner, the display luminance of the first display period in the second mode can be compensated, and the luminance of the display panel in the first display period in the second mode and the luminance of the other display periods in the second mode tend to be consistent, so that in a scene where different-frequency driving is performed for switching, the luminance of the display panel is kept stable all the time, and flicker of the display panel is avoided.
In the embodiment of the present application, the image refresh rate of the first mode may be greater than that of the second mode, i.e., switching from the first mode to the second mode to high-frequency driving to low-frequency driving, or the image refresh rate of the first mode may be less than that of the second mode, i.e., switching from the first mode to the second mode to low-frequency driving to high-frequency driving.
As an example, the image refresh rate of the first mode is greater than that of the second mode, and the duty ratio of the data write frame per display period in the first mode is greater than that of the data write frame per display period in the second mode. Each display period in the first mode may include repeated data write frames and no data retention frames, for example, the base refresh rate of the display panel may be 120Hz, the image refresh rate of the display panel in the first mode may be 120Hz, the image refresh rate of the display panel in the second mode may be 10Hz or 1Hz, etc.; or each display period in the first mode may include one data write frame and a plurality of data hold frames, and the number of the data hold frames in each display period in the first mode is smaller than the number of the data hold frames in each display period in the second mode, for example, the base refresh rate of the display panel is 120Hz, the image refresh rate of the display panel in the first mode is 60Hz, the image refresh rate of the display panel in the second mode is 10Hz or 1Hz, and the like.
In the embodiment of the present application, the voltage value of the data signal of the first data write frame in the second mode is determined according to the voltage values of the data signals of the other data write frames in the second mode, the difference between the image refresh rate of the first mode and the image refresh rate of the second mode, and the gray scale of the display panel.
Specifically, the voltage value of the first data write frame in the second mode may be adjusted based on the voltage value of the data signal of the other data write frame in the second mode, so that the brightness of the display panel of the first data write frame in the second mode and the brightness of the display panel of the other data write frame in the second mode tend to be consistent, that is, the brightness of the display panel tends to be stable after the first mode is switched to the second mode. In addition, if the difference between the image refresh rate in the first mode and the image refresh rate in the second mode is larger, which indicates that flicker is more likely to occur after mode switching, the difference between the voltage value of the data signal in the first data write frame in the second mode and the voltage value of the data signal in the other data write frame in the second mode is set to be larger, that is, the difference between the voltage value of the data signal in the first data write frame in the second mode and the voltage value of the data signal in the other data write frame in the second mode is positively correlated with the difference between the image refresh rate in the first mode and the image refresh rate in the second mode.
For the gray scale of the display panel, the difference between the luminance of the display panel in the first data writing frame in the second mode and the luminance of the display panel in the other data writing frames in the second mode is different under different gray scales, so that the voltage value of the data signal in the first data writing frame in the second mode can be adjusted to different degrees according to the gray scale of the display panel. When the gray scale of the display panel is larger than a first preset gray scale, after the display panel is switched from the first mode to the second mode, the brightness of the display panel in the first display period of the second mode is lower relative to the stable brightness of the display panel, and the larger the gray scale of the display panel is, the larger the brightness difference between the two is; when the gray scale of the display panel is smaller than the second preset gray scale, after the display panel is switched from the first mode to the second mode, the brightness of the display panel in the first display period of the second mode is higher than the stable brightness of the display panel, and the smaller the gray scale of the display panel is, the larger the brightness difference between the two is.
Referring to fig. 4, a schematic diagram of a gray scale of a display panel and a corresponding luminance variation of the display panel according to an embodiment of the present disclosure is shown, where an abscissa represents time and an ordinate represents luminance, where fig. 4B is a partial enlarged view of fig. 4A, and when the gray scale of the display panel is G255, the luminance of the display panel is greatly reduced within 1.15s to 1.31s after switching from the first mode to the second mode; referring to FIG. 5, a schematic diagram of another gray scale of the display panel and the corresponding brightness variation of the display panel provided by the embodiment of the present application is shown, wherein FIG. 5B is a partially enlarged view of FIG. 5A, and after the gray scale of the display panel is G127, the brightness of the display panel is reduced to a small extent within 1.45s-1.61 s; referring to fig. 6, a schematic diagram of another gray scale of the display panel and the corresponding luminance variation of the display panel provided by the embodiment of the present application is shown, wherein fig. 6B is a partially enlarged view of fig. 6A, and when the gray scale of the display panel is G63, the luminance of the display panel is substantially kept stable within 1.32s to 1.57 s.
In the embodiment of the present application, the difference between the image refresh rate in the first mode and the image refresh rate in the second mode is greater than the predetermined refresh rate, and the gray scale of the display panel is greater than the first predetermined gray scale, the brightness of the display panel decreases after the mode switching, for example, the first mode may be high frequency driving, the second mode may be low frequency driving, the image refresh rate difference is large, the display panel flickers, the voltage value of the data signal of the first data write frame in the second mode is smaller than the voltage value of the data signal of the other data write frame in the second mode, the brightness of the display panel is increased when the first data in the second mode is written into the frame by reducing the voltage value of the data signal of the first data in the second mode is written into the frame, to keep the brightness of the frame written with the other data in the second mode to be consistent, i.e., the display panel does not flicker.
In the embodiment of the present application, since the luminance difference between the first display period in the second mode and the other display periods in the second mode of the display panel is generally related to the difference between the voltage value of the data signal of the first data write frame in the second mode and the voltage value of the data signal of the other data write frame in the second mode, the ratio of the voltage value of the data signal of the first data write frame in the second mode to the voltage value of the data signal of the other data write frame in the second mode may be set to be greater than 0.9, so as to ensure the uniformity of the display luminance. For example, the voltage value of the data signal of the other data writing frame in the second mode may be 5V, and the voltage value of the data signal of the first data writing frame in the second mode may be 4.7V, so that the brightness of the display panel when the first data writing frame in the second mode is written into the frame and the brightness of the display panel when the other data writing frame in the second mode is written into the frame tend to be consistent, and the flicker of the display panel is avoided.
In this embodiment, a difference between the image refresh rate in the first mode and the image refresh rate in the second mode is greater than a preset refresh rate, and when the gray scale of the display panel is smaller than a second preset gray scale, it indicates that the brightness of the display panel is increased when the modes are switched, at this time, the first mode may be high-frequency driving, the second mode may be low-frequency driving, the difference in image refresh rate is large, and the display panel flickers, and then the voltage value of the data signal of the first data write frame in the second mode is greater than the voltage value of the data signal of the other data write frames in the second mode. This is because, when the gray scale of the display panel is smaller than the second preset gray scale, after the first mode is switched to the second mode, the brightness of the display panel is temporarily enhanced, and the display panel flickers, and the voltage value of the data signal of the first data write frame in the second mode is increased to reduce the brightness of the display panel in the first data write frame in the second mode, so as to keep the brightness of the display panel in the second mode to be consistent with the brightness of other data write frames in the second mode, that is, the display panel does not flicker.
In the embodiment of the application, when the first mode is switched to the second mode, the data signal received by the source of the driving transistor may be detected to detect the voltage value of the data signal of the first data writing frame in the second mode and the voltage value of the data signal of the other data writing frame in the second mode, so as to ensure that the brightness of the display panel is kept stable.
In the embodiment of the present application, the pixel circuit may further include a data writing module 11, configured to provide a data signal to the driving transistor in a data writing frame; referring to fig. 7, the data writing module is connected to the source of the driving transistor, and a schematic structural diagram of another display panel provided in the embodiment of the present application includes the data writing module 11, a control signal input terminal S1, a driving transistor Mm, and a light emitting element 20.
Referring to fig. 8, for a structural schematic diagram of another display panel provided in the embodiment of the present disclosure, the data writing module 11 may include a first transistor M1, a first terminal (i.e., source) of the first transistor M1 is connected to the driving signal input terminal S3, a second terminal (i.e., drain) of the first transistor M1 is connected to the source of the driving transistor Mm, a data signal or a hold signal may be input to the source of the driving transistor Mm, and a gate of the first transistor M1 is connected to the first control signal terminal S4, so that the first transistor M1 may be controlled to operate normally. In a data write frame, the first transistor M1 writes a data signal to the source of the driving transistor Mm under the control of the signal of the first control signal terminal S4.
In the embodiment of the present application, the gate of the driving transistor can be used to control the driving transistor to be turned on or off, and in the on state, the driving current can be supplied to the light emitting element. For example, the driving transistor can be a P-type transistor, and the gate of the P-type transistor is turned on at a low level, so that the power consumption can be reduced.
Referring to fig. 9, which is a schematic top view of a display panel in an embodiment of the present application, the display panel may have a display area AA and a non-display area NA, and the non-display area NA is disposed at a periphery of the display area AA. The display area AA has a display function for disposing light emitting elements to realize display of contents to be displayed. The non-display area NA is not used for displaying, and may be provided with a circuit unit, a trace line, and the like, and the circuit unit may include a pixel circuit, and is configured to control the light emitting element in the display area AA, so as to display the content to be displayed.
In the display area AA, the light emitting element may include a liquid crystal light emitting element or an Organic Light Emitting Diode (LED), and the light emitting element may be connected to a Thin Film Transistor (TFT) for controlling power supply to the light emitting element, thereby controlling display of the light emitting element. In the non-display area NA, the driving circuit may include a thin film transistor for connection with the light emitting element to control power supply of the light emitting element to control display of the light emitting element.
When the light emitting element includes a liquid crystal light emitting element, referring to fig. 10, which is a schematic cross-sectional view of the display panel in fig. 9 along the AA' direction, the display panel may include an array substrate 30, a color filter substrate 50, and a liquid crystal layer 40 between the array substrate 30 and the color filter substrate 50, where the array substrate 30 includes a substrate and a thin film transistor array, the color filter substrate 50 includes a substrate and a filter array, and the thin film transistor array is used for driving the liquid crystal layer 40 to implement display of related content; when the light emitting element includes an organic light emitting diode, referring to fig. 11, which is another schematic cross-sectional view along direction AA' of the display panel in fig. 9, the display panel may include an array substrate 60 and an organic light emitting diode 70 on the array substrate 60, where the array substrate 60 includes a substrate and a thin film transistor array, and the thin film transistor array is used for driving the organic light emitting diode 70 to achieve display of related content.
In this embodiment, the Display region and the non-Display region may both be provided with thin film transistors, and a Display panel formed by using a Hybrid TFT Display (HTD) technology may be provided with a plurality of different transistors, specifically, the Display panel may include an oxide transistor and a silicon transistor, for example, the Display region may be provided with an oxide transistor, and the non-Display region may be provided with a silicon transistor. The active layer in the oxide transistor may be an oxide, such as Indium Gallium Zinc Oxide (IGZO), and the active layer in the Silicon transistor may be Silicon, such as Low Temperature Polysilicon (LTPS).
The embodiment of the application provides a display panel, the display panel comprises a pixel circuit and a light-emitting element, the pixel circuit comprises a driving transistor, the drain electrode of the driving transistor is connected with the light-emitting element and used for providing driving current for the light-emitting element, the display panel has a first mode and a second mode, each display period in the second mode comprises a data writing frame and at least one data holding frame, in the data writing frame, the source electrode of the driving transistor receives a data signal, the driving transistor provides driving current for the light-emitting element according to the driving signal, in the data holding frame, the source electrode of the driving transistor does not receive the data signal, the driving transistor does not provide driving current for the light-emitting element, the source electrode of the driving transistor receives the holding signal, and the holding signal is larger than the data signal. After switching from the first mode to the second mode, since a drift of the driving transistor characteristics occurs in the data holding frame, which drift is compensated for in the second data writing frame in the second mode, a change in luminance easily occurs in the first display period in the second mode, and luminance is restored in the second display period, so that the display panel flickers after frequency switching.
Therefore, in the embodiment of the present application, the voltage value of the data signal of the first data write frame in the second mode may be set to be different from the voltage value of the data signal of the other data write frame in the second mode, so that by setting the voltage value of the data signal of the first data write frame in the second mode in a targeted manner, the threshold voltage of the driving transistor can be compensated, the display luminance of the first display period in the second mode is compensated, and the luminance of the display panel in the first display period in the second mode and the luminance of the other display periods in the second mode tend to be consistent, so that the luminance of the display panel is kept stable all the time in a scene where different frequency driving is switched, and flicker of the display panel is avoided.
Based on the display panel provided by the above embodiment, as shown in fig. 12, an embodiment of the present application further provides a display device, which includes the display panel, where the display panel has a display area AA and a non-display area NA, and the non-display area is disposed around the display area. The display device in the embodiment of the present application may be any device having a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, a television, an intelligent wearable product, and the like.
When introducing elements of various embodiments of the present application, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The foregoing is merely a preferred embodiment of the present application and, although the present application discloses the foregoing preferred embodiments, the present application is not limited thereto. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (13)
1. A display panel, comprising: a pixel circuit and a light emitting element;
the pixel circuit comprises a driving transistor, wherein the drain electrode of the driving transistor is connected with the light-emitting element and used for providing driving current for the light-emitting element;
the display panel has a first mode and a second mode, each display period in the second mode including one data write frame and at least one data hold frame;
in the data writing frame, the source electrode of the driving transistor receives a data signal, and the driving transistor provides a driving current for the light-emitting element according to the driving signal; after the first mode is switched to the second mode, the voltage value of the data signal of the first data writing frame in the second mode is different from the voltage value of the data signal of other data writing frames in the second mode;
in the data holding frame, the source of the driving transistor does not receive a data signal, the driving transistor does not provide a driving current for the light emitting element, and the source of the driving transistor receives a holding signal which is greater than the data signal.
2. The display panel of claim 1, wherein the image refresh rate of the first mode is greater than the image refresh rate of the second mode.
3. The display panel according to claim 2, wherein the first mode includes repeated data writing frames and does not include a data holding frame.
4. The display panel according to claim 3, wherein the image refresh rate of the first mode is 120Hz, and the image refresh rate of the second mode is 1Hz or 10 Hz.
5. The display panel according to any one of claims 1 to 4, wherein a voltage value of a data signal of a first data write frame in the second mode is determined based on voltage values of data signals of other data write frames in the second mode, an image refresh rate difference between the first mode and the second mode, and a gray scale of the display panel.
6. The display panel according to claim 5, wherein a difference between the image refresh rate in the first mode and the image refresh rate in the second mode is greater than a preset refresh rate, and wherein the gray scale of the display panel is greater than a first preset gray scale, and wherein a voltage value of a data signal of a first data write frame in the second mode is smaller than a voltage value of a data signal of other data write frames in the second mode.
7. The display panel according to claim 6, wherein a ratio of a voltage value of a data signal of a first data write frame in the second mode to a voltage value of a data signal of other data write frames in the second mode is greater than 0.9.
8. The display panel according to claim 5, wherein a difference between the image refresh rate in the first mode and the image refresh rate in the second mode is greater than a preset refresh rate, and when the gray scale of the display panel is smaller than a second preset gray scale, a voltage value of a data signal of a first data write frame in the second mode is greater than a voltage value of a data signal of other data write frames in the second mode.
9. The display panel according to any one of claims 1 to 4, wherein the voltage value of the data signal of the other data write frame in the second mode is in a range of 4 to 6V, and the voltage value of the hold signal is in a range of 6.5 to 7V.
10. The display panel according to any one of claims 1 to 4, further comprising:
the data writing module is used for providing data signals for the driving transistor in a data writing frame; the data writing module is connected with the source electrode of the driving transistor.
11. The display panel according to claim 10, wherein the data writing module comprises a first transistor, a first terminal of the first transistor is connected to a driving signal input terminal, a second terminal of the first transistor is connected to a source of the driving transistor, and a gate of the first transistor is connected to a first control signal terminal;
in the data write frame, the first transistor writes the data signal to the source of the driving transistor under the control of a signal of the first control signal terminal.
12. The display panel according to any one of claims 1 to 4, wherein the driving transistor is a P-type transistor.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
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| CN115662334A (en) * | 2022-09-06 | 2023-01-31 | 厦门天马显示科技有限公司 | Display panel, driving method thereof, driving circuit and display device |
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