CN113436578A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN113436578A CN113436578A CN202110745593.4A CN202110745593A CN113436578A CN 113436578 A CN113436578 A CN 113436578A CN 202110745593 A CN202110745593 A CN 202110745593A CN 113436578 A CN113436578 A CN 113436578A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2074—Display of intermediate tones using sub-pixels
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the application provides a display panel and a display device, wherein the display panel comprises a first color sub-pixel, a second color sub-pixel and a charge storage module, a first end of the charge storage module is electrically connected with an anode of a light emitting element of the second color sub-pixel, and a second end of the charge storage module is electrically connected with any one of the anode of the light emitting element of the first color sub-pixel and a cathode of the light emitting element of the second color sub-pixel. According to the embodiment of the application, the transverse leakage current between the sub-pixels with different colors can be stored, and the power consumption of the display panel is reduced.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a display panel and a display device.
Background
An Organic Light-Emitting Diode (OLED) display panel has the advantages of high brightness, full viewing angle, fast response speed, and the like, and is therefore widely applied to the display field.
In order to display a colorful image, the OLED display panel generally includes a plurality of color sub-pixels. The inventor finds that the lateral leakage current exists between the sub-pixels with different colors, so that the black state voltage values of the sub-pixels with some colors are improved, and the power consumption of the OLED display panel is further increased.
Disclosure of Invention
The embodiment of the application provides a display panel and a display device, which can store transverse leakage currents among sub-pixels with different colors and reduce the power consumption of an OLED display panel.
In a first aspect, an embodiment of the present application provides a display panel, including:
the pixel structure comprises a first color sub-pixel, a second color sub-pixel and a charge storage module, wherein a first end of the charge storage module is electrically connected with an anode of a light emitting element of the second color sub-pixel, and a second end of the charge storage module is electrically connected with any one of the anode of the light emitting element of the first color sub-pixel and a cathode of the light emitting element of the second color sub-pixel.
In some embodiments, the charge storage module may comprise a first storage capacitor, wherein:
the first electrode plate of the first storage capacitor is electrically connected with the anode of the light-emitting element of the first color sub-pixel, the second electrode plate of the first storage capacitor is electrically connected with the anode of the light-emitting element of the second color sub-pixel, and the first storage capacitors correspond to the first color sub-pixels one by one.
Therefore, the first storage capacitor is connected between the anode of the light-emitting element of the first color sub-pixel and the anode of the light-emitting element of the second color sub-pixel, so that the leakage charge flowing from the first color sub-pixel to the light-emitting element of the second color sub-pixel can be stored, the leakage charge can not flow into the light-emitting element of the second color sub-pixel, the light-emitting element of the second color sub-pixel can maintain the black state according to the original black state voltage value, the black state voltage value of the second color sub-pixel is not required to be improved, and the power consumption of the OLED display panel is reduced.
In some embodiments, the charge storage module may comprise a first storage capacitor, wherein:
the first polar plate of the first storage capacitor is electrically connected with the anode of the luminous element of the second color sub-pixel, and the second polar plate of the first storage capacitor is electrically connected with the cathode of the luminous element of the second color sub-pixel.
Therefore, the first storage capacitor is connected between the anode of the light-emitting element of the second color sub-pixel and the cathode of the light-emitting element of the second color sub-pixel, so that the leakage charge flowing from the first color sub-pixel to the light-emitting element of the second color sub-pixel can be stored, the leakage charge can not flow into the light-emitting element of the second color sub-pixel, the light-emitting element of the second color sub-pixel can maintain the black state according to the original black state voltage value, the black state voltage value of the second color sub-pixel does not need to be improved, and the power consumption of the OLED display panel is reduced.
In some embodiments, the first color sub-pixel may comprise a blue sub-pixel and the second color sub-pixel may comprise a red sub-pixel or a green sub-pixel.
Therefore, the charge storage module is arranged between the blue sub-pixel and the red sub-pixel or the green sub-pixel, so that electric charges, which flow from the blue sub-pixel to the light-emitting element of the red sub-pixel or the green sub-pixel, can be stored, the electric charges cannot flow into the light-emitting element of the red sub-pixel or the green sub-pixel, the light-emitting element of the red sub-pixel or the green sub-pixel can maintain a black state according to an original black state voltage value, the black state voltage value of the red sub-pixel or the green sub-pixel does not need to be increased, and the power consumption of the OLED display panel is reduced.
In some embodiments, at least one of the first color sub-pixel and the second color sub-pixel is a target color sub-pixel, the target color sub-pixel may further include a pixel driving circuit, and the pixel driving circuit may include:
and the control end of the reset module is electrically connected with the scanning signal line, the first end of the reset module is electrically connected with the reference voltage signal line, and the second end of the reset module is electrically connected with the anode of the light-emitting element of the target color sub-pixel and is used for resetting the anode of the light-emitting element of the target color sub-pixel and the charge storage module.
Therefore, the charge storage module is reset through the reset module, the leakage charges stored by each frame of charge storage module can be eliminated, the second color sub-pixel is guaranteed not to emit light due to the fact that the charge storage module is full of charges, the light emitting element of the second color sub-pixel can be further guaranteed to be capable of maintaining the black state according to the original black state voltage value, the black state voltage value of the second color sub-pixel does not need to be improved, and the power consumption of the OLED display panel is reduced.
In some embodiments, the second color sub-pixel is a target color sub-pixel, the target color sub-pixel further includes a pixel driving circuit, and the pixel driving circuit may include:
and the control end of the reset module is electrically connected with the scanning signal line, the first end of the reset module is electrically connected with the reference voltage signal line, the second end of the reset module is electrically connected with the anode of the light-emitting element of the target color sub-pixel, and the reset module is used for resetting the anode of the light-emitting element of the target color sub-pixel and the charge storage module.
In some embodiments, the reset module may include a reset transistor, a control electrode of the reset transistor being electrically connected to the scan signal line, a first electrode of the reset transistor being electrically connected to the reference voltage signal line, and a second electrode of the reset transistor being electrically connected to an anode of the light emitting element of the target color sub-pixel.
In some embodiments, the pixel driving circuit may further include:
a driving transistor for driving the light emitting element of the target color sub-pixel to emit light;
a first electrode plate of the second storage capacitor is electrically connected with the grid electrode of the driving transistor, and a second electrode plate of the second storage capacitor is electrically connected with the first power supply voltage signal end;
under the condition that the charge storage module is a first storage capacitor, the capacitance value of the first storage capacitor is larger than that of the second storage capacitor.
Therefore, the first storage capacitor with the large capacitance value is arranged, so that the second color sub-pixel can be guaranteed not to emit light due to the fact that the first storage capacitor is full of charges, the light emitting element of the second color sub-pixel can be further guaranteed to maintain a black state according to the original black state voltage value, the black state voltage value of the second color sub-pixel does not need to be improved, and the power consumption of the OLED display panel is reduced.
In some embodiments, the first plate of the first storage capacitor and the first plate of the second storage capacitor are in the same film layer, and the second plate of the first storage capacitor and the second plate of the second storage capacitor are in the same film layer.
Therefore, the first storage capacitor and the second storage capacitor in the pixel driving circuit can be prepared by the same process, and the process is simplified.
In a second aspect, embodiments of the present application provide a display device, which includes the display panel provided in any one of the first aspect.
The display panel and the display device in the embodiment of the application include a first color sub-pixel, a second color sub-pixel and a charge storage module, wherein a first end of the charge storage module is electrically connected with an anode of a light emitting element of the second color sub-pixel, and a second end of the charge storage module is electrically connected with any one of the anode of the light emitting element of the first color sub-pixel and a cathode of the light emitting element of the second color sub-pixel. The leakage charges flowing from the first color sub-pixel to the light emitting element of the second color sub-pixel are stored by the charge storage module, so the leakage charges cannot flow into the light emitting element of the second color sub-pixel, and the light emitting element of the second color sub-pixel can maintain a black state according to the original black state voltage value, the black state voltage value of the second color sub-pixel does not need to be improved, and the power consumption of the OLED display panel is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an equivalent circuit of an organic light emitting diode;
fig. 2 is a circuit diagram of a display panel according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of a display panel according to another embodiment of the present application;
fig. 4 is a circuit diagram of a display panel according to still another embodiment of the present disclosure;
fig. 5 is a schematic block diagram of a display panel according to still another embodiment of the present disclosure;
fig. 6 is a schematic block diagram of a display panel according to still another embodiment of the present disclosure;
fig. 7 is a schematic block diagram of a display panel according to still another embodiment of the present disclosure;
FIG. 8 is a circuit diagram corresponding to the display panel shown in FIG. 5;
FIG. 9 is a circuit diagram corresponding to the display panel shown in FIG. 6;
FIG. 10 is a circuit diagram corresponding to the display panel shown in FIG. 7;
fig. 11 is a circuit diagram of a display panel according to still another embodiment of the present application;
fig. 12 is a schematic diagram illustrating a film structure of a display panel according to an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Before explaining the technical solutions provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application first specifically explains the problems existing in the prior art:
as shown in fig. 1, the organic light emitting diode OLED may be equivalently connected in parallel with a light emitting diode D and an equivalent capacitor C, wherein Vss represents the first power voltage terminal. When the OLED is lighted, the equivalent capacitor C needs to be charged firstly, and when the end voltage of the capacitor is charged to the starting voltage of the light-emitting diode D, the light-emitting diode D is conducted, and the OLED emits light.
Through research by the inventors of the present application, it is found that the capacitance values of the equivalent capacitances of the organic light emitting diodes in the different color sub-pixels are different, for example, the capacitance value of the equivalent capacitance of the organic light emitting diode in the blue B sub-pixel is larger than that of the equivalent capacitance of the organic light emitting diode in the red R sub-pixel, and the capacitance value of the equivalent capacitance of the organic light emitting diode in the B sub-pixel is larger than that of the equivalent capacitance of the organic light emitting diode in the green G sub-pixel. And the lighting voltages of the different color sub-pixels are different due to the material factor. During the lighting (charging) process of the color sub-pixel with higher lighting voltage, the charges in the color sub-pixel with higher lighting voltage flow to the color sub-pixel with lower lighting voltage (i.e. the lateral leakage current between the color sub-pixels) through the common layer (such as the hole injection layer HIL) between the color sub-pixels with different lighting voltage, which may cause the color sub-pixel with lower lighting voltage to be also lighted. In this case, in order to ensure that the color sub-pixels with lower lighting voltage maintain the black state (are not lighted), the black state voltage value of the color sub-pixels with lower lighting voltage needs to be increased, and the power consumption of the display panel is increased.
In view of the above research of the inventors, embodiments of the present application provide a display panel and a display device, which can solve the technical problem of large power consumption of an OLED display panel in the related art.
The technical idea of the embodiment of the application is as follows: and adding a charge storage module, so that a first end of the charge storage module is electrically connected with the anode of the light-emitting element of the second color sub-pixel, and a second end of the charge storage module is electrically connected with any one of the anode of the light-emitting element of the first color sub-pixel and the cathode of the light-emitting element of the second color sub-pixel. Therefore, the leakage charges flowing from the first color sub-pixel to the light emitting element of the second color sub-pixel are stored by the charge storage module, so that the leakage charges cannot flow into the light emitting element of the second color sub-pixel, and the light emitting element of the second color sub-pixel can maintain a black state according to the original black state voltage value, the black state voltage value of the second color sub-pixel does not need to be increased, and the power consumption of the OLED display panel is reduced.
The following first describes a display panel provided in an embodiment of the present application.
As shown in fig. 2, the display panel 100 may include:
the pixel structure comprises a first color sub-pixel 101, a second color sub-pixel 102 and a charge storage module 103, wherein a first end of the charge storage module 103 is electrically connected with an anode of a light emitting element D2 of the second color sub-pixel 102, and a second end of the charge storage module 103 is electrically connected with any one of an anode of a light emitting element D1 of the first color sub-pixel 101 and a cathode of a light emitting element D2 of the second color sub-pixel 102.
In the embodiment of the present application, since the charges leaked from the first color sub-pixel stream 101 to the light emitting device D2 of the second color sub-pixel 102 are stored by the charge storage module 103, the charges do not flow into the light emitting device D2 of the second color sub-pixel 102, and the light emitting device D2 of the second color sub-pixel 1021 can maintain the black state according to the original black state voltage value, without increasing the black state voltage value of the second color sub-pixel D2, thereby reducing the power consumption of the OLED display panel.
It is easily understood that the display panel 100 may include a plurality of pixel units arranged in an array, and each pixel unit may include sub-pixels of a plurality of colors, such as a red sub-pixel, a green sub-pixel, and a blue sub-pixel. In addition, each pixel unit may further include other color sub-pixels, such as a white color sub-pixel, which is not limited in this embodiment. It should be noted that the first color sub-pixel 101 and the second color sub-pixel 102 may be sub-pixels of different colors in the same pixel unit. For example, for any one pixel unit (e.g., pixel unit a) in the display panel 100, the first color sub-pixel 101 may be a blue sub-pixel in the pixel unit a, and the second color sub-pixel 102 may be a red sub-pixel or a green sub-pixel in the pixel unit a. Of course, the first color sub-pixel 101 and the second color sub-pixel 102 may also be sub-pixels of different colors in different pixel units, for example, for any two pixel units (e.g., pixel unit a and pixel unit B) in the display panel 100, the first color sub-pixel 101 may be a blue sub-pixel in the pixel unit a, and the second color sub-pixel 102 may be a red sub-pixel or a green sub-pixel in the pixel unit B, which is not limited in this application.
In some alternative embodiments, the first color sub-pixel 101 and the second color sub-pixel 102 may be sub-pixels of different colors in adjacent pixel units. For example, the pixel unit C and the pixel unit D are adjacent pixel units, the first color sub-pixel 101 may be a blue sub-pixel in the pixel unit C, and the second color sub-pixel 102 may be a red sub-pixel or a green sub-pixel in the pixel unit D. In this way, since the first color sub-pixel 101 and the second color sub-pixel 102 are adjacent to each other, the length of the trace connecting the first color sub-pixel 101 and the second color sub-pixel 102 by the charge storage module 103 can be reduced, and the leakage charge of the first color sub-pixel 101 can be stored in time, so that the leakage charge of the first color sub-pixel 101 is prevented from flowing into other sub-pixels between the first color sub-pixel 101 and the second color sub-pixel 102.
The inventors of the present application have found that the lighting voltage of the blue sub-pixel is higher than that of the red sub-pixel, and the lighting voltage of the blue sub-pixel is also higher than that of the green sub-pixel. Therefore, the blue sub-pixel may leak current to the red sub-pixel or the green sub-pixel. In view of this, the first color sub-pixel stream 101 may include blue sub-pixels, and the second color sub-pixels 102 may include red sub-pixels or green sub-pixels. Therefore, the charge storage module is arranged between the blue sub-pixel and the red sub-pixel or between the blue sub-pixel and the green sub-pixel, so that the leakage charge flowing from the blue sub-pixel to the light emitting element of the red sub-pixel or the green sub-pixel can be stored, the leakage charge can not flow into the light emitting element of the red sub-pixel or the green sub-pixel, the light emitting element of the red sub-pixel or the green sub-pixel can maintain the black state according to the original black state voltage value, the black state voltage value of the red sub-pixel or the green sub-pixel does not need to be increased, and the power consumption of the OLED display panel is reduced.
The inventors of the present application have found that the red sub-pixel is more prone to the problem of an increase in the black state voltage value than the green sub-pixel. Thus, based on the inventors' findings, in some alternative embodiments, the first color sub-pixel stream 101 may be a blue sub-pixel and the second color sub-pixel 102 may be a red sub-pixel. Therefore, compared with the charge storage module arranged between the blue sub-pixel and the green sub-pixel, the charge storage module arranged between the blue sub-pixel and the red sub-pixel can ensure that the red sub-pixel which is easy to have the problem of black state voltage value improvement can maintain the black state according to the original black state voltage value, the black state voltage value of the red sub-pixel does not need to be improved, and the power consumption of the OLED display panel is further reduced.
As shown in fig. 3, the branch where the resistor R is located between the first color sub-pixel 101 and the second color sub-pixel 102, and the branch where the resistor R is located represents a common layer, that is, the first color sub-pixel 101 leaks charges to the second color sub-pixel 102 through the branch where the resistor R is located (common layer). In some specific embodiments, the charge storage module 103 may include a first storage capacitor C1, wherein a first plate of the first storage capacitor C1 may be electrically connected to the anode of the light emitting element D1 of the first color sub-pixel 101, and a second plate of the first storage capacitor C1 may be electrically connected to the anode of the light emitting element D2 of the second color sub-pixel 102.
When the first color sub-pixel 101 is turned on, a voltage difference exists between the anode of the light emitting element D1 of the first color sub-pixel 101 and the anode of the light emitting element D2 of the second color sub-pixel 102, so that the first plate of the first storage capacitor C1 induces charges of a first polarity, the second plate of the first storage capacitor C1 induces charges of a second polarity, and the leakage charges flowing from the first color sub-pixel 101 to the second color sub-pixel 102 are stored in the first storage capacitor C1 and do not flow to the light emitting element D2 of the second color sub-pixel 102, and the light emitting element D2 of the second color sub-pixel 1021 can maintain a black state according to an original black state voltage value without increasing the black state voltage value of the second color sub-pixel D2, thereby reducing power consumption of the OLED display panel. It should be noted that in the embodiment of the present application, one of the first polarity and the second polarity is positive and the other is negative, that is, one plate of the first storage capacitor C1 is positively charged and the other plate thereof is negatively charged.
It should be noted that, in correspondence with the example shown in fig. 3, that is, in a case where the first plate of the first storage capacitor C1 is electrically connected to the anode of the light emitting element D1 of the first color sub-pixel 101, and the second plate of the first storage capacitor C1 is electrically connected to the anode of the light emitting element D2 of the second color sub-pixel 102, the first storage capacitors C1 may be in one-to-one correspondence with the first color sub-pixels 101. For example, when the first color sub-pixel 101 is a blue sub-pixel and the second color sub-pixel 102 is a red sub-pixel or a green sub-pixel, the one-to-one correspondence between the first storage capacitors C1 and the first color sub-pixels 101 can be understood as follows: for any one of the blue sub-pixels, the blue sub-pixel is connected to only one of the red and green sub-pixels through the first storage capacitor C1, i.e., to either the red sub-pixel or the green sub-pixel. However, for the plurality of blue sub-pixels in the display panel, a part of the blue sub-pixels may be connected to the red sub-pixel through the first storage capacitor C1, and another part of the blue sub-pixels may be connected to the green sub-pixel through the first storage capacitor C1, which is not limited in this embodiment of the present application.
In other specific embodiments, as shown in fig. 4, the first plate of the first storage capacitor C1 may be electrically connected to the anode of the light emitting element D2 of the second color sub-pixel 102, and the second plate of the first storage capacitor C1 may be electrically connected to the cathode of the light emitting element D2 of the second color sub-pixel 102.
As described above, the organic light emitting diode OLED (light emitting element) may be equivalently connected in parallel with one light emitting diode D and one equivalent capacitor C. By connecting the first storage capacitor C1 in parallel between the anode and the cathode of the light emitting element D2 of the second color sub-pixel 102, the capacitance of the equivalent capacitor C is increased, and it is ensured that the light emitting element D2 of the second color sub-pixel 102 can maintain the black state (will not be lit) during the process of lighting the first color sub-pixel 101, so that the black state voltage value of the second color sub-pixel D2 does not need to be increased, and the power consumption of the OLED display panel is reduced.
To ensure that the charge storage module 103 does not cause the light emitting element D2 of the second color sub-pixel 102 to emit light due to the full charge, in some embodiments, the charge storage module 103 may be reset at intervals to clear the stored leakage charge of the charge storage module 103.
Specifically, as shown in fig. 5 to 7, the target color sub-pixel may further include a pixel driving circuit, and the pixel driving circuit may include:
and a reset module 104, a control end of the reset module 104 is electrically connected to the scanning signal line S, a first end of the reset module 104 is electrically connected to the reference voltage signal line Vref, and a second end of the reset module 104 is electrically connected to an anode of the light emitting element of the target color sub-pixel, and is configured to reset the anode of the light emitting element of the target color sub-pixel and the charge storage module 103.
In the present embodiment, when the first storage capacitor C1 is connected according to the embodiment shown in fig. 3, that is, when the first plate of the first storage capacitor C1 is electrically connected to the anode of the light emitting element D1 of the first color sub-pixel 101 and the second plate of the first storage capacitor C1 is electrically connected to the anode of the light emitting element D2 of the second color sub-pixel 102, the target color sub-pixel may include at least one of the first color sub-pixel 101 and the second color sub-pixel 102. As an example, as shown in fig. 5, the target color subpixel may include a first color subpixel 101. In the reset phase, the reset module 104 in the first color sub-pixel 101 is turned on under the control of the scan signal output by the scan signal line S, and transmits the reference voltage signal output by the reference voltage signal line Vref to the anode of the light emitting element D1 of the first color sub-pixel 101 and the first plate of the first storage capacitor C1, so as to reset the first plate of the first storage capacitor C1 while resetting the anode of the light emitting element D1 of the first color sub-pixel 101, and clear the leakage charges stored in the charge storage module 103 (the first storage capacitor C1).
As another example, as shown in fig. 6, the target color sub-pixel may include the second color sub-pixel 102. In the reset phase, the reset module 104 in the second color sub-pixel 102 is turned on under the control of the scan signal output by the scan signal line S, and transmits the reference voltage signal output by the reference voltage signal line Vref to the anode of the light emitting element D2 of the second color sub-pixel 101 and the second plate of the first storage capacitor C1, so as to reset the second plate of the first storage capacitor C1 while resetting the anode of the light emitting element D2 of the second color sub-pixel 102, and clear the leakage charges stored in the charge storage module 103 (the first storage capacitor C1).
As yet another example, as shown in fig. 7, the target color sub-pixel may include a first color sub-pixel 101 and a second color sub-pixel 102. In the reset phase, the reset module 104 in the first color sub-pixel 101 is turned on under the control of the scan signal output by the scan signal line S, and transmits the reference voltage signal output by the reference voltage signal line Vref to the anode of the light emitting element D1 of the first color sub-pixel 101 and the first plate of the first storage capacitor C1, so as to reset the first plate of the first storage capacitor C1 while resetting the anode of the light emitting element D1 of the first color sub-pixel 101. Meanwhile, the reset module 104 in the second color sub-pixel 102 is turned on under the control of the scan signal outputted from the scan signal line S, and transmits the reference voltage signal outputted from the reference voltage signal line Vref to the anode of the light emitting element D2 of the second color sub-pixel 101 and the second plate of the first storage capacitor C1, so as to reset the second plate of the first storage capacitor C1 while resetting the anode of the light emitting element D2 of the second color sub-pixel 102. In this example, the charge storage block 103 (first storage capacitor C1) is cleared of stored leakage charge by resetting the first and second plates of the first storage capacitor C1.
In any example of fig. 5 to 7, the charge storage module is reset by the reset module, so that the leakage charge stored in the charge storage module of each frame can be cleared, it is ensured that the second color sub-pixel does not emit light due to the full charge storage of the charge storage module, it is further ensured that the light emitting element of the second color sub-pixel can maintain the black state according to the original black state voltage value, and further, the black state voltage value of the second color sub-pixel does not need to be increased, and the power consumption of the OLED display panel is reduced.
It should be noted that when the first storage capacitor C1 is connected as shown in fig. 4, that is, when the first plate of the first storage capacitor C1 is electrically connected to the anode of the light emitting element D2 of the second color sub-pixel 102, and the second plate of the first storage capacitor C1 is electrically connected to the cathode of the light emitting element D2 of the second color sub-pixel 102, the target color sub-pixel may include the second color sub-pixel 102, that is, the second plate of the first storage capacitor C1 may be reset by the reset module 104 in the second color sub-pixel 102, and the charge leakage stored in the charge storage module 103 (the first storage capacitor C1) is cleared, similar to the example shown in fig. 6.
As shown in fig. 8 to 10, in some specific embodiments, the reset module 104 may include a reset transistor T1, a gate of the reset transistor T1 being electrically connected to the scan signal line S, a first pole of the reset transistor T1 being electrically connected to the reference voltage signal line Vref, and a second pole of the reset transistor T1 being electrically connected to an anode of the light emitting element of the target color sub-pixel.
In the specific implementation, the gate of the transistor is used as the control electrode, and the first electrode of the transistor may be used as the source and the second electrode as the drain, or the first electrode may be used as the drain and the second electrode as the source, depending on the signal of the gate of the transistor and the type of the gate, which is not distinguished herein.
As shown in fig. 8, corresponding to the example shown in fig. 5, the target color sub-pixel may include a first color sub-pixel 101. In the reset phase, the reset transistor T1 in the first color sub-pixel 101 is turned on under the control of the scan signal output by the scan signal line S, and the reference voltage signal output by the reference voltage signal line Vref is transmitted to the anode of the light emitting element D1 of the first color sub-pixel 101 and the first plate of the first storage capacitor C1, so as to reset the anode of the light emitting element D1 of the first color sub-pixel 101 and simultaneously reset the first plate of the first storage capacitor C1, and clear the leakage charges stored in the charge storage module 103 (the first storage capacitor C1).
As shown in fig. 9, corresponding to the example shown in fig. 6, the target color sub-pixel may include a second color sub-pixel 102. In the reset phase, the reset transistor T1 in the second color sub-pixel 102 is turned on under the control of the scan signal output by the scan signal line S, and transmits the reference voltage signal output by the reference voltage signal line Vref to the anode of the light emitting element D2 of the second color sub-pixel 101 and the second plate of the first storage capacitor C1, so as to reset the second plate of the first storage capacitor C1 and clear the leakage charges stored in the charge storage module 103 (the first storage capacitor C1) while resetting the anode of the light emitting element D2 of the second color sub-pixel 102.
As shown in fig. 10, corresponding to the example shown in fig. 7, the target color sub-pixel may include a first color sub-pixel 101 and a second color sub-pixel 102. In the reset phase, the reset transistor T1 in the first color sub-pixel 101 is turned on under the control of the scan signal output from the scan signal line S, and transmits the reference voltage signal output from the reference voltage signal line Vref to the anode of the light emitting element D1 of the first color sub-pixel 101 and the first plate of the first storage capacitor C1, so as to reset the first plate of the first storage capacitor C1 while resetting the anode of the light emitting element D1 of the first color sub-pixel 101. At the same time, the reset transistor T1 in the second color sub-pixel 102 is turned on under the control of the scan signal output from the scan signal line S, and transmits the reference voltage signal output from the reference voltage signal line Vref to the anode of the light emitting element D2 of the second color sub-pixel 101 and the second plate of the first storage capacitor C1, so as to reset the anode of the light emitting element D2 of the second color sub-pixel 102 and simultaneously reset the second plate of the first storage capacitor C1. In the example shown in fig. 7 and 10, the electric charge stored in the charge storage block 103 (the first storage capacitor C1) is cleared by resetting the first plate and the second plate of the first storage capacitor C1.
In any of the examples of fig. 8 to fig. 10, the reset transistor T1 is used to reset the charge storage module, so as to clear the leakage charges stored in the charge storage module of each frame, ensure that the second color sub-pixel does not emit light due to the full charge storage of the charge storage module, further ensure that the light emitting element of the second color sub-pixel can maintain the black state according to the original black state voltage value, further avoid increasing the black state voltage value of the second color sub-pixel, and reduce the power consumption of the OLED display panel.
It should be noted that when the first storage capacitor C1 is connected as shown in fig. 4, that is, when the first plate of the first storage capacitor C1 is electrically connected to the anode of the light-emitting element D2 of the second color sub-pixel 102, and the second plate of the first storage capacitor C1 is electrically connected to the cathode of the light-emitting element D2 of the second color sub-pixel 102, the target color sub-pixel may include the second color sub-pixel 102, that is, the second plate of the first storage capacitor C1 may be reset by the reset module 104 (reset transistor T1) in the second color sub-pixel 102 to clear the leakage charges stored in the charge storage module 103 (first storage capacitor C1), similar to the example shown in fig. 6 and 9.
As shown in fig. 11, the pixel driving circuit of the target color sub-pixel may further include:
a driving transistor T0 for driving the light emitting element of the target color sub-pixel to emit light;
a second storage capacitor C2, a first plate of the second storage capacitor C2 being electrically connected to the gate of the driving transistor T0, and a second plate of the second storage capacitor C2 being electrically connected to the first power voltage signal terminal Vdd.
Alternatively, in order to ensure that leakage charge does not flow into the light emitting element of the second color sub-pixel, the capacitance of the first storage capacitor C1 may be flexibly adjusted according to actual conditions, for example, the capacitance of the first storage capacitor C1 may be set to be relatively large. As an example, in case the charge storage module 103 is the first storage capacitor C1, the capacitance value of the first storage capacitor C1 may be larger than the capacitance value of the second storage capacitor C2.
Therefore, the first storage capacitor C1 with a large capacitance value is arranged, so that the second color sub-pixel can be guaranteed not to emit light due to the fact that the first storage capacitor C1 is full of charges, the light-emitting element of the second color sub-pixel can be further guaranteed to be in a black state according to the original black state voltage value, the black state voltage value of the second color sub-pixel does not need to be improved, and the power consumption of the OLED display panel is reduced.
It should be noted that, the specific size of the capacitance value of the first storage capacitor C1 can be flexibly adjusted according to practical situations, and the embodiment of the present application is not limited to this. In addition, the pixel driving circuit may further include other transistors besides the driving transistor T0, the second storage capacitor C2 and the reset transistor T1, such as a transistor for writing a data signal, a transistor for threshold compensation, a transistor for resetting other nodes in the circuit, and/or a transistor for light emission control, which is not limited in this embodiment of the present application. For example, the pixel driving circuit in the embodiment of the present application may be any one of 2T1C, 3T1C, … …, 6T1C, 6T2C, 7T1C, and 7T2C pixel driving circuits.
When the first storage capacitor C1 is connected as shown in fig. 3, that is, when the first plate of the first storage capacitor C1 is electrically connected to the anode of the light emitting element D1 of the first color sub-pixel 101 and the second plate of the first storage capacitor C1 is electrically connected to the anode of the light emitting element D2 of the second color sub-pixel 102, as shown in fig. 12, the first plate of the first storage capacitor C1 may be in the same layer as the first plate of the second storage capacitor C2, and the second plate of the first storage capacitor C1 may be in the same layer as the second plate of the second storage capacitor C2.
Specifically, continuing with fig. 12, the display panel 100 may include a substrate 10, an active layer 11, a gate insulating layer 12, a gate metal layer 13, a capacitor dielectric layer 14, a capacitor metal layer 15, an interlayer insulating layer 16, a planarization layer 17, a first electrode layer 18, a pixel defining layer 19, an organic light emitting layer (not shown in the figure), and a second electrode layer (not shown in the figure) which are sequentially stacked. The first electrode layer 18 is, for example, an anode layer provided with anodes of light emitting elements of the respective color sub-pixels; the second electrode layer is, for example, a cathode layer of the light emitting element of each color sub-pixel, and may be a surface electrode. For example, the first plate of the first storage capacitor C1 and the first plate of the second storage capacitor C2 may be located in the gate metal layer 13, and the second plate of the first storage capacitor C1 and the second plate of the second storage capacitor C2 may be located in the capacitor second electrode metal layer 15. Alternatively, the first plate of the first storage capacitor C1 and the first plate of the second storage capacitor C2 may be located in the capacitor second metal layer 15, and the second plate of the first storage capacitor C1 and the second plate of the second storage capacitor C2 may be located in the gate metal layer 13. For example, the first plate of the first storage capacitor C1 may be electrically connected to the anode of the light emitting element D1 of the first color sub-pixel 101 through the first via a, and the second plate of the first storage capacitor C1 may be electrically connected to the anode of the light emitting element D2 of the second color sub-pixel 102 through the second via b and the metal trace C.
Thus, the first storage capacitor C1 can be prepared by the same process as the second storage capacitor C2 in the pixel driving circuit, which is beneficial to simplifying the process.
When the first storage capacitor C1 is connected as shown in fig. 4, that is, when the first plate of the first storage capacitor C1 is electrically connected to the anode of the light emitting element D2 of the second color sub-pixel 102 and the second plate of the first storage capacitor C1 is electrically connected to the cathode of the light emitting element D2 of the second color sub-pixel 102, the first plate of the first storage capacitor C1 and the first plate of the second storage capacitor C2 may be in the same film layer, and the second plate of the first storage capacitor C1 and the second plate of the second storage capacitor C2 may be in the same film layer. Note, however, that when the second plate of the first storage capacitor C1 is electrically connected to the cathode of the light-emitting element D2 of the second color sub-pixel 102 through a via, since the via needs to pass through a common layer (e.g., a hole injection layer) in the organic light-emitting layer 20, in order to avoid direct contact between the via and the common layer, a protective layer (insulating layer) needs to be formed around the outside of the via to avoid direct electrical connection between the cathode of the light-emitting element D2 of the second color sub-pixel 102 and the common layer through the via. In other examples, when the first storage capacitor C1 is connected as shown in fig. 4, the first plate of the first storage capacitor C1 and the second plate of the first storage capacitor C1 may also be disposed in the organic light emitting layer between the first electrode layer 18 and the second electrode layer 21, and the specific positions of the first plate of the first storage capacitor C1 and the second plate of the first storage capacitor C1 are not limited in the embodiments of the present application.
Based on the display panel provided in the foregoing embodiment, correspondingly, the present application also provides a display apparatus, as shown in fig. 13, the display apparatus 1000 may include an apparatus body 200 and the display panel 100 in the foregoing embodiment, and the display panel 100 is covered on the apparatus body 200. The apparatus body 200 may be provided with various devices, such as a sensing device, a processing device, and the like, and is not limited herein. The display device 1000 may be a device having a display function, such as a mobile phone, a computer, a tablet computer, a digital camera, a television, and electronic paper, and is not limited herein.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the display panel embodiment and the display device embodiment, the related matters can be referred to the description parts of the pixel driving circuit embodiment and the array substrate embodiment. The present application is not limited to the particular structures described above and shown in the figures. Those skilled in the art may make various changes, modifications and additions after comprehending the spirit of the present application. Also, a detailed description of known techniques is omitted herein for the sake of brevity.
It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims. In the claims, the term "comprising" does not exclude other structures; the quantities relate to "a" and "an" but do not exclude a plurality; the terms "first" and "second" are used to denote a name and not to denote any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims (10)
1. A display panel, comprising:
the pixel structure comprises a first color sub-pixel, a second color sub-pixel and a charge storage module, wherein a first end of the charge storage module is electrically connected with an anode of a light emitting element of the second color sub-pixel, and a second end of the charge storage module is electrically connected with any one of the anode of the light emitting element of the first color sub-pixel and a cathode of the light emitting element of the second color sub-pixel.
2. The display panel of claim 1, wherein the charge storage module comprises a first storage capacitor, wherein:
the first plate of the first storage capacitor is electrically connected with the anode of the light-emitting element of the second color sub-pixel, and the second plate of the first storage capacitor is electrically connected with the anode of the light-emitting element of the first color sub-pixel;
the first storage capacitors correspond to the first color sub-pixels one to one.
3. The display panel of claim 1, wherein the charge storage module comprises a first storage capacitor, wherein:
the first plate of the first storage capacitor is electrically connected with the anode of the light-emitting element of the second color sub-pixel, and the second plate of the first storage capacitor is electrically connected with the cathode of the light-emitting element of the second color sub-pixel.
4. The display panel according to any one of claims 1 to 3, wherein the first color sub-pixel comprises a blue sub-pixel and the second color sub-pixel comprises a red sub-pixel or a green sub-pixel.
5. The display panel according to claim 2, wherein at least one of the first color sub-pixel and the second color sub-pixel is a target color sub-pixel, the target color sub-pixel further comprising a pixel driving circuit, the pixel driving circuit comprising:
the control end of the reset module is electrically connected with the scanning signal line, the first end of the reset module is electrically connected with the reference voltage signal line, the second end of the reset module is electrically connected with the anode of the light-emitting element of the target color sub-pixel, and the reset module is used for resetting the anode of the light-emitting element of the target color sub-pixel and the charge storage module.
6. The display panel of claim 3, wherein the second color sub-pixel is a target color sub-pixel, and the target color sub-pixel further comprises a pixel driving circuit, and the pixel driving circuit comprises:
the control end of the reset module is electrically connected with the scanning signal line, the first end of the reset module is electrically connected with the reference voltage signal line, the second end of the reset module is electrically connected with the anode of the light-emitting element of the target color sub-pixel, and the reset module is used for resetting the anode of the light-emitting element of the target color sub-pixel and the charge storage module.
7. The display panel according to claim 5 or 6, wherein the reset module includes a reset transistor, a gate of the reset transistor is electrically connected to the scan signal line, a first pole of the reset transistor is electrically connected to the reference voltage signal line, and a second pole of the reset transistor is electrically connected to an anode of the light emitting element of the target color sub-pixel.
8. The display panel according to claim 5 or 6, wherein the pixel driving circuit further comprises:
the driving transistor is used for driving the light-emitting element of the target color sub-pixel to emit light;
a first electrode plate of the second storage capacitor is electrically connected with the grid electrode of the driving transistor, and a second electrode plate of the second storage capacitor is electrically connected with the first power supply voltage signal wire;
under the condition that the charge storage module comprises a first storage capacitor, the capacitance value of the first storage capacitor is larger than that of the second storage capacitor.
9. The display panel of claim 8, wherein the first plate of the first storage capacitor and the first plate of the second storage capacitor are in a same film layer, and the second plate of the first storage capacitor and the second plate of the second storage capacitor are in a same film layer.
10. A display device characterized in that it comprises a display panel according to any one of claims 1 to 9.
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