CN112908264A - Pixel driving circuit, driving method, display panel and display device - Google Patents
Pixel driving circuit, driving method, display panel and display device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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Abstract
The embodiment of the application provides a pixel driving circuit, a driving method, a display panel and a display device, wherein the pixel driving circuit comprises: the control end of the switching element is electrically connected with the first scanning signal line, and the first pole of the switching element is electrically connected with the first node; the first node is electrically connected with the first pole of the light-emitting element, and the second pole of the light-emitting element is electrically connected with the first power supply voltage signal line; and the first end of the energy storage module is electrically connected with the second pole of the switching element, and the second end of the energy storage module is electrically connected with the first power supply voltage signal line. The embodiment of the application can be applied to OLED display, the problem of color cast of the OLED display panel can be solved, and the display effect of the OLED display panel is improved.
Description
Technical Field
The present application belongs to the field of display technologies, and in particular, to a pixel driving circuit, a driving method, a display panel, and a display device.
Background
Organic Light-Emitting diodes (OLEDs) are increasingly used in the display field because of their advantages of active Light emission, viewing angle, fast response, wide color gamut, and low power consumption.
However, the inventors of the present application have found that the OLED display panel has a problem of poor display effect due to a color shift phenomenon that the display is reddish or purplish when the display is performed at low luminance.
Disclosure of Invention
The embodiment of the application provides a pixel driving circuit, a driving method, a display panel and a display device, which can be applied to OLED display, can solve the problem of color cast of the OLED display panel, and improve the display effect.
In a first aspect, an embodiment of the present application provides a pixel driving circuit, where the pixel driving circuit drives a light emitting element to emit light, and the pixel driving circuit includes:
the control end of the switching element is electrically connected with the first scanning signal line, and the first pole of the switching element is electrically connected with the first node; the first node is electrically connected with the first pole of the light-emitting element, and the second pole of the light-emitting element is electrically connected with the first power supply voltage signal line;
and the first end of the energy storage module is electrically connected with the second pole of the switching element, and the second end of the energy storage module is electrically connected with the first power supply voltage signal line.
In a second aspect, an embodiment of the present application provides a driving method, which is applied to the pixel driving circuit of the first aspect, and the driving method includes:
in the light-emitting stage, the level of the first scanning signal output by the first scanning signal line is an on level, the switching element is turned on under the control of the first scanning signal, and the light-emitting element emits light under the drive of the pixel drive circuit.
In a third aspect, an embodiment of the present application provides a display panel, where the display panel includes the pixel driving circuit provided in the first aspect.
In a fourth aspect, embodiments of the present application provide a display device including the display panel according to the third aspect.
The pixel driving circuit, the driving method, the display panel and the display device of the embodiment of the application include: the control end of the switching element is electrically connected with the first scanning signal line, and the first pole of the switching element is electrically connected with the first node; the first node is electrically connected with the first pole of the light-emitting element, and the second pole of the light-emitting element is electrically connected with the first power supply voltage signal line; and the first end of the energy storage module is electrically connected with the second pole of the switching element, and the second end of the energy storage module is electrically connected with the first power supply voltage signal line. When the switch element is switched on, the energy storage module can store the charges input on the light-emitting element so as to adjust the charging time of the light-emitting element, so that the charging time of the light-emitting element of each color sub-pixel is balanced, the brightness of the light emitted by the light-emitting element of each color sub-pixel is balanced, the problem of color cast of the OLED display panel is solved, and the display effect is improved.
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 schematic diagram of charging RGB three-color sub-pixels with high duty ratio in the light-emitting period;
FIG. 3 is a schematic diagram of charging RGB three-color sub-pixels with low duty ratio in the light-emitting period;
fig. 4 is a circuit diagram of a pixel driving circuit according to an embodiment of the present application;
fig. 5 is a circuit diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 6 is a circuit diagram of a pixel driving circuit according to another embodiment of the present application;
fig. 7 is a circuit diagram of a pixel driving circuit according to another embodiment of the present application;
fig. 8 is a circuit diagram of a pixel driving circuit according to another embodiment of the present application;
fig. 9 is a circuit diagram of a pixel driving circuit according to another embodiment of the present application;
fig. 10 is a circuit diagram of a pixel driving circuit according to another embodiment of the present application;
fig. 11 is a circuit diagram of a pixel driving circuit according to another embodiment of the present application;
fig. 12 is a circuit diagram of a pixel driving circuit according to another embodiment of the present application;
fig. 13 is a circuit diagram of a pixel driving circuit according to yet another embodiment of the present application;
fig. 14 is a schematic flowchart of a driving method according to an embodiment of the present application;
fig. 15 is a schematic flowchart of a driving method according to another embodiment of the present application;
FIG. 16 is a timing diagram of the pixel driving circuit shown in FIG. 13;
fig. 17 is a schematic structural diagram of a display panel according to an embodiment of the present application;
fig. 18 is a schematic structural diagram of a display panel according to another embodiment of the present application;
fig. 19 is a schematic structural diagram of a display panel according to yet another 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 OLED can be equivalently formed by connecting a transistor T and an equivalent capacitor C in parallel, when the OLED is lighted, the equivalent capacitor C needs to be charged first, and when the voltage at the end of the capacitor is charged to the turn-on voltage of the transistor T, the transistor T is turned on, and the OLED emits light.
As understood in conjunction with fig. 1, as shown in fig. 2, in the OLED display device, the light emitting period T3 includes a pulse rising edge period T31 and a pulse stabilization period T32. In the light-emitting period T3, the control signal input terminal emit outputs an on level, the sub-pixel is charged in the pulse rising period T31, and the sub-pixel stably emits light in the pulse stabilization period T322.
In the OLED display device, a pixel includes a red color sub-pixel (R sub-pixel), a green color sub-pixel (G sub-pixel), and a blue color sub-pixel (B sub-pixel). The inventors of the present application have found that the R, G, and B sub-pixels have different driving tube currents and equivalent capacitances, and thus the charging time T31 is different for the R, G, and B sub-pixels during light emission. As shown in FIG. 2, the charging time of the R sub-pixel is T31-R, G, the charging time of the B sub-pixel is T31-G, and the charging time of the G sub-pixel is T31-B, wherein the capacitance of the equivalent capacitor of the G sub-pixel is the largest, so the charging time of the G sub-pixel is the longest T31-G.
As shown in fig. 2, when the duty ratio in the light emission period is large, the duty ratio in the pulse rising edge period T31 is small, and the duty ratio in the pulse stabilization period T32 is large, and the problem of color shift to red or violet hardly occurs. The duty ratio of the light-emitting stage can be understood as the proportion of the light-emitting stage T3 in one frame time, and the larger the duty ratio of the light-emitting stage is, the longer the light-emitting stage T3 is; the smaller the light emission phase duty ratio, the shorter the light emission phase T3.
As shown in fig. 2 and fig. 3, as the duty ratio of the light-emitting period is gradually decreased, the duty ratio of the pulse rising edge period T31 in the light-emitting period T3 is increased, and the difference between the charging times of the sub-pixels with different colors is more obvious. Since the equivalent capacitance of the G sub-pixel is the largest, the charging time (non-emitting time) T31-G of the G sub-pixel is the longest and the G color brightness is the lowest, so that the color shift problem of the red shift or the purple shift (red light plus blue light) occurs.
In addition, the inventor of the present application has found that, besides the duty ratio of the light emitting stage affects the color shift, the problem of the color shift is more serious as the gray scale level is reduced, and thus the gray scale level also affects the color shift.
In view of the above findings, embodiments of the present application provide a pixel driving circuit, a driving method, a display panel and a display device to solve the color shift problem of an OLED display panel.
The technical idea of the embodiment of the application is as follows: an energy storage module is connected in parallel on the light-emitting element, and a switch element is arranged between the light-emitting element and the energy storage module; when the switch element is switched on, the energy storage module can store the charges input on the light-emitting element, so that the charging time of the light-emitting element is adjusted, the charging time of the light-emitting element of each color sub-pixel is balanced, the brightness of the light emitted by the light-emitting element of each color sub-pixel is balanced, the problem of color cast of the OLED display panel is solved, and the display effect is improved.
The following first describes a pixel driving circuit provided in an embodiment of the present application.
As shown in fig. 4, the pixel driving circuit 10 according to the embodiment of the present disclosure can drive the light emitting element 20 to emit light, the first electrode of the light emitting element 20 is electrically connected to the first node N1, and the second electrode of the light emitting element 20 is electrically connected to the first power voltage signal line PVEE.
The pixel drive circuit 10 includes:
a switching element 11, a control terminal of the switching element 11 being electrically connected to the first scanning signal line S1, a first pole of the switching element 11 being electrically connected to the first node N1; and a first end of the energy storage module 12 is electrically connected to the second pole of the switching element 11, and a second end of the energy storage module 12 is electrically connected to the first power voltage signal line PVEE.
The switching element 11 is turned on under the control of the first scanning signal output from the first scanning signal line S1, that is, when the first scanning signal is at an on level, the switching element 11 is turned on. When the switch element 11 is turned on, the energy storage module 12 can store the charges input to the light emitting elements, so that the charging time of the light emitting elements is adjusted, the charging time of the light emitting elements of the sub-pixels in each color is balanced, the brightness of the light emitted by the light emitting elements of the sub-pixels in each color is balanced, the color cast problem of the OLED display panel is solved, and the display effect is improved.
In the embodiments of the present application, the on level and the off level are distinguished according to the type of the switching transistor, the on level refers to a level capable of controlling the switching transistor to be turned on, and the off level refers to a level capable of controlling the switching transistor to be turned off, for example, when the switching transistor is a P-type transistor, the on level is a low level, and the off level is a high level; when the switching transistor is an N-type transistor, the on level is a high level and the off level is a low level. In the embodiments of the present application, the switching transistor is described as a P-type transistor, that is, in the embodiments of the present application, the on levels are all low levels, and the off levels are all high levels.
As described above, the equivalent capacitance of the G sub-pixel is usually the largest compared to the R sub-pixel and the B sub-pixel, so that the charging time (non-emitting time) T31-G of the G sub-pixel is the longest and the luminance of the G color is the lowest, and thus the color shift problem of the red shift or the violet shift (red light plus blue light) occurs. Therefore, in order to reduce or eliminate the color shift problem of the reddish or purplish color shift, the pixel driving circuit 10 described above may be provided in the R sub-pixel and/or the B sub-pixel, i.e., the pixel driving circuit 10 may drive the target light emitting element to emit light, which may include light emitting elements emitting red light and/or blue light. Therefore, the charging time of the light-emitting elements in the R sub-pixel and/or the B sub-pixel can be prolonged, the brightness of light emitted by the R sub-pixel and/or the B sub-pixel is reduced, the brightness difference between the R sub-pixel and/or the B sub-pixel and the G sub-pixel is reduced, and the problem of color cast of displaying red or purple is solved.
As shown in fig. 5, in some embodiments, the switching element 11 may be a first transistor T1, a control terminal of the first transistor T1 is electrically connected to the first scan signal line S1, and a first pole of the first transistor T1 is electrically connected to the first node N1. The energy storage module 12 may be a storage capacitor C1, a first plate of the storage capacitor C1 is electrically connected to the second pole of the first transistor T1, and a second plate of the storage capacitor C1 is electrically connected to the first power voltage signal line PVEE.
The first transistor T1 is turned on under the control of the first scan signal output from the first scan signal line S1, that is, when the first scan signal is on, the first transistor T1 is turned on. When the first transistor T1 is turned on, the storage capacitor C1 may store the charge inputted on the light emitting element 20, thereby adjusting the charging period of the light emitting element 20. The light emitting element 20 may be, for example, a light emitting element in an R sub-pixel and/or a B sub-pixel, so as to prolong a charging time of the light emitting element in the R sub-pixel and/or the B sub-pixel, further reduce luminance of light emitted by the R sub-pixel and/or the B sub-pixel, and reduce a luminance difference between the R sub-pixel and/or the B sub-pixel and the G sub-pixel, thereby solving a color shift problem of displaying reddish or purplish.
It is easily understood that the circuit structure in the pixel driving circuit 10 of the embodiment of the present application may be applied to any form or structure of pixel driving circuits, such as a 2T1C pixel driving circuit, a 3T1C pixel driving circuit, a 4T2C pixel driving circuit, a … … pixel driving circuit, a 7T1C pixel driving circuit, a 7T2C pixel driving circuit, and the like.
As shown in fig. 6, in some embodiments, the pixel driving circuit 10 may further include:
a control end of the driving module 13 is electrically connected to the second node N2, a first end of the driving module 13 is electrically connected to the first node N1, and a second end of the driving module 13 is electrically connected to the second power voltage signal line PVDD; the driving module 13 may be configured to provide a driving current for the light emitting element 20 to drive the light emitting element 20 to emit light;
a memory module 14, a first terminal of the memory module 14 being electrically connected to the second power supply voltage signal line PVDD, and a second terminal of the memory module 14 being electrically connected to the second node N2; the storage module 14 may be configured to maintain a potential of the control terminal of the driving module 13, and may also be understood as storing a voltage of the control terminal of the driving module 13;
a Data writing module 15, a control end of the Data writing module 15 is electrically connected to the second scanning signal line S2, a first end of the Data writing module 15 is electrically connected to the Data signal line Data, and a second end of the Data writing module 15 is electrically connected to the second end of the driving module 13; the Data writing module 15 is turned on under the control of the second scan signal output by the second scan signal line S2, and can be used to write the Data signal output by the Data signal line Data into the second end of the driving module 13. The driving current provided by the driving module 13 is related to the data signal, so that the driving current can be controlled by adjusting the voltage of the data signal, and the brightness of the light emitted by the light emitting element 20 can be controlled.
As shown in fig. 7, the driving module 13 may be a second transistor T2, the memory module 14 may be a second capacitor C2, and the data writing module 15 may be a third transistor T3. A control electrode of the second transistor T2 is electrically connected to the second node N2, a first electrode of the second transistor T2 is electrically connected to the first node N1, and a second electrode of the second transistor T2 is electrically connected to the second power supply voltage signal line PVDD. A first plate of the second capacitor C2 is electrically connected to the second power voltage signal line PVDD, and a second plate of the second capacitor C2 is electrically connected to the second node N2. A control electrode of the third transistor T3 is electrically connected to the second scan signal line S2, a first electrode of the third transistor T3 is electrically connected to the Data signal line Data, and a second electrode of the third transistor T3 is electrically connected to the second electrode of the second transistor T2.
As shown in fig. 8, in some embodiments, the pixel driving circuit 10 may further include:
the control terminal of the threshold compensation module 16 is electrically connected to the second scan signal line S2, the first terminal of the threshold compensation module 16 is electrically connected to the first node N1, and the second terminal of the threshold compensation module 16 is electrically connected to the second node N2. The threshold compensation module 16 is configured to be turned on under the control of the second scan signal output by the second scan signal line S2, so that the control terminal of the driving module 13 is connected to the second terminal of the driving module 13. When the control terminal of the driving module 13 is connected to the second terminal of the driving module 13, the storage module 14 is charged, and the voltage level of the control terminal of the driving module 13 reaches a target voltage value under the action of the data signal, where the target voltage value is equal to the difference between the data signal voltage value Vdata and the threshold voltage Vth of the driving module, that is, the voltage level N2 of the control terminal of the driving module 13 is Vdata-Vth.
As shown in fig. 9, the threshold compensation module 16 may be a fourth transistor T4, a control electrode of the fourth transistor T4 is electrically connected to the second scan signal line S2, a first electrode of the fourth transistor T4 is electrically connected to the first node N1, and a second electrode of the fourth transistor T4 is electrically connected to the second node N2.
As shown in fig. 10, in some embodiments, the pixel driving circuit 10 may further include:
a control end of the first light-emitting control module 17 is connected with the control signal line Emit, a first end of the first light-emitting control module 17 is electrically connected with the second power voltage signal line PVDD, and a second end of the first light-emitting control module 18 is electrically connected with a second end of the driving module 13; the first light-emitting control module 17 is configured to control whether the second power voltage signal is provided to the second end of the driving module 13 according to a control signal (also referred to as a light-emitting control signal) output by the control signal line Emit;
the second light emission control module 18 is arranged between the first end of the driving module 13 and the first node N1, the control end of the second light emission control module 18 is electrically connected with the control signal line Emit, the first end of the second light emission control module 18 is electrically connected with the first end of the driving module 13, and the second end of the second light emission control module 18 is electrically connected with the first node N1; the second light emission control module 18 is configured to control whether the driving current generated by the driving module 13 is supplied to the light emitting element 20 according to the control signal output by the control signal line Emit.
As shown in fig. 11, the first light emission control module 17 may be a fifth transistor T5, and the second light emission control module 18 may be a sixth transistor T6. A control electrode of the fifth transistor T5 is electrically connected to the control signal line electric Emit, a first electrode of the fifth transistor T5 is electrically connected to the second power supply voltage signal line PVDD, and a second electrode of the fifth transistor T5 is electrically connected to the second electrode of the second transistor T2. A control electrode of the sixth transistor T6 is electrically connected to the control signal line Emit, a first electrode of the sixth transistor T6 is electrically connected to the first electrode of the second transistor T2, and a second electrode of the sixth transistor T6 is electrically connected to the first node N1.
As shown in fig. 12, in some embodiments, the pixel driving circuit 10 may further include:
a first node reset module 19, wherein a control terminal of the first node reset module 19 is electrically connected to the third scan signal line S3, a first terminal of the first node reset module 19 is electrically connected to the reference signal input terminal Vref, and a second terminal of the first node reset module 19 is electrically connected to the first node N1; the first node reset module 19 is configured to transmit a reference signal input by the reference signal input terminal Vref to the first node N1 under the control of a third scan signal output by the third scan signal line S3, so as to reset the first node N1;
a second node reset module 21, wherein a control terminal of the second node reset module 21 is electrically connected to the fourth scan signal line S4, a first terminal of the second node reset module 21 is electrically connected to the reference signal input terminal Vref, and a second terminal of the second node reset module 21 is electrically connected to the second node N2; the second node reset module 21 is configured to transmit the reference signal input by the reference signal input terminal Vref to the second node N2 under the control of the fourth scan signal output by the fourth scan signal line S4, so as to reset the second node N2.
As shown in fig. 13, the first node reset module 19 may be a seventh transistor T7, and the second node reset module 21 may be an eighth transistor T8. A control electrode of the seventh transistor T7 is electrically connected to the third scan signal line S3, a first electrode of the seventh transistor T7 is electrically connected to the reference signal input terminal Vref, and a second electrode of the seventh transistor T7 is electrically connected to the first node N1. A control electrode of the eighth transistor T8 is electrically connected to the fourth scan signal line S4, a first electrode of the eighth transistor T8 is electrically connected to the reference signal input terminal Vref, and a second electrode of the eighth transistor T8 is electrically connected to the second node N2.
In some embodiments, the first plate of the energy storage module and the control terminal of the switching element may be fabricated in the same layer as the control terminal of the driving module, and the second plate of the energy storage module and the first and second terminals of the switching element may be fabricated in the same layer as the first and second terminals of the driving module. Specifically, the first plate of the storage capacitor C1 and the control electrode of the first transistor T1 may be fabricated at the same layer as the control electrode of the second transistor T2, and the second plate of the storage capacitor C1 and the first and second electrodes of the first transistor T1 may be fabricated at the same layer as the first and second electrodes of the second transistor T2. Therefore, an additional processing technology is not added, the preparation is simple, and the problem of color cast of the OLED display panel can be weakened or even eliminated under the condition that the additional processing technology is not added.
As described above, the color shift phenomenon is more serious as the duty ratio and/or the gray scale level of the emission period become smaller, that is, the severity of the color shift phenomenon is different at different duty ratios and/or different gray scale levels of the emission period. In view of this, in the embodiment of the present application, the on-time of the switching element 11 is flexibly adjusted according to different duty ratios of the light-emitting stages and/or different gray scale levels, so as to solve the color shift problem in different duty ratios of the light-emitting stages and/or different gray scale levels.
Specifically, the embodiment of the present application determines in advance a correspondence between the target brightness parameter and the on-time. The target brightness parameter may include a light emitting phase duty ratio and/or a gray scale level, among others. The duty ratio of the light-emitting stage has the value range as follows: 0-100%, and the value range of the gray scale level is as follows: 0 to 255.
Table 1 schematically shows the correspondence between the partial target luminance parameter and the on-time period.
In table 1, x1, x2, x3 and x4 respectively indicate the on-periods of the switching elements 11 having duty ratios of 20%, 15%, 10% and 5% at the light emission stage at a gray scale level of 127, that is, the periods during which the first scan signal line S1 outputs the on-level, and x1, x2, x3 and x4 are known parameters. k1, k2, k3 and k4 represent preset coefficients, wherein 0 < k1 < k2 < k3 < k 4.
As can be seen from table 3, the on-time of the switching element 11 is negatively related to the duty ratio of the light emitting period, and the on-time of the switching element 11 is negatively related to the gray scale level. That is, as the duty ratio and the gray-scale level are decreased step by step in the light emitting stage, the on-period of the switching element 11 is increased step by step.
In some embodiments, the correspondence between the target brightness parameter and the on-time period may be stored in the form of a data table, for example. In practical application, for example, a first on duration corresponding to the current target brightness parameter may be determined according to a correspondence between the stored target brightness parameter and the on duration through direct table lookup or linear interpolation, and then the first scanning signal line S1 is controlled to output an on level of the first on duration according to the first on duration. For example, if the current target brightness parameter is 20% of the duty ratio of the light-emitting period and 32% of the gray scale level, the first on-time corresponding to the current target brightness parameter is determined to be, for example, k1(127/32) x1, and then the first scanning signal line S1 is controlled to output the on-level of k1(127/32) x 1.
Therefore, the embodiment of the application can solve the problem of color cast under different duty ratios of the light-emitting stage and/or different gray scale levels by controlling the on duration of the switching element.
Based on the pixel driving circuit provided by the above embodiment, correspondingly, the application also provides a specific implementation manner of the driving method. Please see the examples below.
The driving method of the embodiment of the present application can be applied to the pixel driving circuit described above. As shown in fig. 14, the driving method of the embodiment of the present application includes:
in the light emitting stage, the level of the first scan signal output from the first scan signal line is an on level, the switching element is turned on under the control of the first scan signal, and the light emitting element emits light under the drive of the pixel drive circuit.
As shown in fig. 5, in the light emitting stage, the first scan signal line S1 outputs a conducting level, the first transistor T1 is turned on, and the storage capacitor C1 can store the charges inputted from the first node N1 to the light emitting element 20, so as to adjust the charging duration of the light emitting element 20, and equalize the charging durations of the light emitting elements of the sub-pixels of the respective colors, thereby equalizing the brightness of the light emitted by the light emitting elements of the sub-pixels of the respective colors, solving the color shift problem of the OLED display panel, and improving the display effect.
The light emitting element 20 may be, for example, a light emitting element in an R sub-pixel and/or a B sub-pixel, so that the charging time of the light emitting element in the R sub-pixel and/or the B sub-pixel may be prolonged, the luminance of light emitted by the R sub-pixel and/or the B sub-pixel may be reduced, and the luminance difference between the R sub-pixel and/or the B sub-pixel and the G sub-pixel may be reduced, thereby solving the color shift problem of displaying reddish or purplish.
In some embodiments, the on-time of the switching element can be flexibly adjusted. As shown in fig. 15, before S101, the driving method of the embodiment of the present application may further include S1001 and S1002.
S1001, a first target brightness parameter of the display device is obtained. The first target brightness parameter may include a duty ratio of a light emitting stage and/or a gray scale level of the display device.
S1002, determining a first conduction time corresponding to the first target brightness parameter according to the corresponding relation between the predetermined target brightness parameter and the conduction time. The on-time is the time length of the first scanning signal line output on-level obtained by white balance adjustment under each target brightness parameter.
As described above, the correspondence between the target luminance parameter and the on-time period may be stored in the form of a data table, for example. In S1002, for example, a first on-time corresponding to the current first target brightness parameter may be determined according to the stored correspondence between the target brightness parameter and the on-time in a direct table lookup or linear interpolation manner.
Correspondingly, S101 may specifically include: and controlling the first scanning signal line to output the conducting level of the first conducting duration. For brevity, the detailed description is omitted here.
Fig. 16 is a timing diagram of the pixel driving circuit shown in fig. 13. As shown in fig. 13 and 16, before S101, the driving method of the embodiment of the present application may further include an initialization phase t1 and a data writing phase t 2.
In the initialization stage T1, the fourth scan signal line S4 provides a low level, the second scan signal line S2, the third scan signal line S3 and the control signal line Emit provide a high level, and the reference signal provided by the reference signal line Vref is transmitted to the second node N2 via the eighth transistor T8 which is turned on, so that the second node N2 is reset.
In the data writing period (threshold compensation period) T2, the second scanning signal line S2, the third scanning signal line S3, the fourth scanning signal line S4, and the control signal line Emit are supplied with a low level, and the reference signal supplied from the reference signal line Vref is transmitted to the first electrode (anode) of the light emitting element 20 via the turned-on seventh transistor T7, thereby resetting the first electrode of the light emitting element 20. Meanwhile, the Data signal provided from the Data line Data is transmitted to the second transistor T2 through the turned-on third transistor T3 and fourth transistor T4, the Data signal is written into the second transistor T2, and the threshold voltage of the second transistor T2 is compensated.
S101 may specifically include: in the light-emitting period T3, the control signal line Emit provides a low level, the first scan signal line S1 provides a low level for a preset on-time, the second scan signal line S2, the third scan signal line S3 and the fourth scan signal line S4 provide a high level, and the driving current converted by the data signal and the power signal is transmitted to the first electrode of the light-emitting element 20 through the turned-on fifth transistor T5 and the turned-on sixth transistor T6, so as to charge the light-emitting element 20 first and then drive the light-emitting element 20 to Emit light. During the charging process of the light emitting device 20, the first transistor T1 is turned on, and the storage capacitor C1 can store the charges inputted from the first node N1 to the light emitting device 20, so as to adjust the charging duration of the light emitting device 20 to solve the color shift problem.
The present application also provides a display panel, which may include the pixel driving circuit in the above embodiments. The display panel may be, for example, an Active-matrix organic light-emitting diode (AM-OLED) display panel, but is not limited thereto.
As shown in fig. 17, in some embodiments, the display panel 120 of the embodiment of the present application includes:
n first scanning signal lines S1 arranged in sequence in the first direction, N being an integer greater than or equal to 2;
the first gate line driving circuit 121, the first gate line driving circuit 121 includes N first scanning shift registers 121a, and in the first direction, output terminals of the N first scanning shift registers 121a are connected to the N first scanning signal lines S1 in a one-to-one correspondence. That is, the display panel 120 of the embodiment of the present application may adopt a single-side driving method to control the on/off of the switching element.
As shown in fig. 18, in some embodiments, the display panel 120 of the embodiment of the present application may further include:
the second gate line driving circuit 122, the second gate line driving circuit 122 includes N second scanning shift registers 122a, in the first direction, the output ends of the N second scanning shift registers 122a are connected with the N first scanning signal lines S1 in a one-to-one correspondence;
the first gate line driving circuit 121 and the second gate line driving circuit 122 are respectively located at a first side and a second side of the display panel 120. That is, the display panel 120 of the embodiment of the present application may adopt a dual-edge driving method to control the on/off of the switching element.
As shown in fig. 19, in some embodiments, the display panel 120 of the embodiment of the present application includes:
n first scanning signal lines S1 arranged in sequence in the first direction, N being an integer greater than or equal to 2;
the scan line driving chip 123, the scan line driving chip 123 includes N scan signal output ends, and in the first direction, the N scan signal output ends are connected with the N first scan signal lines in a one-to-one correspondence manner. That is, the display panel 120 of the embodiment of the present application may control the switching elements to be turned on or off in a manner of a scan line driving chip (gate IC) to realize a narrow frame.
The application also provides a display device. The display device may include an apparatus body and the display panel in the above embodiments, and the display panel is covered on the apparatus body. The device body 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 may be, but is not limited to, a device having a display function, such as a mobile phone, a computer, a tablet computer, a digital camera, a television, and electronic paper.
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 (17)
1. A pixel driving circuit which drives a light emitting element to emit light, comprising:
a switching element, a control terminal of which is electrically connected to a first scanning signal line, and a first pole of which is electrically connected to a first node; wherein the first node is electrically connected to a first pole of the light emitting element, and a second pole of the light emitting element is electrically connected to a first power supply voltage signal line;
and the first end of the energy storage module is electrically connected with the second pole of the switching element, and the second end of the energy storage module is electrically connected with the first power supply voltage signal line.
2. The pixel driving circuit according to claim 1, wherein the energy storage module comprises a storage capacitor, and the first terminal and the second terminal of the energy storage module are respectively a first plate and a second plate of the storage capacitor.
3. The pixel driving circuit according to claim 1, wherein the pixel driving circuit drives a target light emitting element to emit light.
4. The pixel driving circuit according to claim 3, wherein the target light emitting element includes the light emitting element emitting red light and/or blue light.
5. The pixel driving circuit according to claim 1, further comprising:
the control end of the driving module is electrically connected with the second node, and the first end of the driving module is electrically connected with the first node;
a first end of the storage module is electrically connected with a second power supply voltage signal line, and a second end of the storage module is electrically connected with the second node;
and the control end of the data writing module is electrically connected with the second scanning signal line, the first end of the data writing module is electrically connected with the data signal line, and the second end of the data writing module is electrically connected with the second end of the driving module.
6. The pixel driving circuit according to claim 5, further comprising:
a control end of the threshold compensation module is electrically connected with the second scanning signal line, a first end of the threshold compensation module is electrically connected with the first node, and a second end of the threshold compensation module is electrically connected with the second node.
7. The pixel driving circuit according to claim 6, further comprising:
a first light emitting control module, a control end of which is electrically connected with a control signal line, a first end of which is electrically connected with the second power voltage signal line, and a second end of which is electrically connected with a second end of the driving module;
the second light-emitting control module is arranged between the first end of the driving module and the first node, the control end of the second light-emitting control module is electrically connected with the control signal line, the first end of the second light-emitting control module is electrically connected with the first end of the driving module, and the second end of the second light-emitting control module is electrically connected with the first node.
8. The pixel driving circuit according to claim 7, further comprising:
a control end of the first node reset module is electrically connected with a third scanning signal line, a first end of the first node reset module is electrically connected with a reference signal input end, and a second end of the first node reset module is electrically connected with the first node;
and the control end of the second node resetting module is electrically connected with the fourth scanning signal line, the first end of the second node resetting module is electrically connected with the reference signal input end, and the second end of the second node resetting module is electrically connected with the second node.
9. The pixel driving circuit according to claim 5, wherein the first plate of the energy storage module, the control terminal of the switching element and the control terminal of the driving module are fabricated in the same layer, and the second plate of the energy storage module, the first terminal and the second terminal of the switching element and the first terminal and the second terminal of the driving module are fabricated in the same layer.
10. A driving method applied to the pixel driving circuit according to any one of claims 1 to 9, comprising:
in a light emitting period, a level of a first scan signal output from the first scan signal line is an on level, the switching element is turned on under the control of the first scan signal, and the light emitting element emits light under the drive of the pixel drive circuit.
11. The driving method according to claim 10, wherein the pixel driving circuit is applied to a display device;
prior to the lighting phase, the method further comprises:
acquiring a first target brightness parameter of the display device;
determining a first conduction time length corresponding to the first target brightness parameter according to a predetermined corresponding relation between the target brightness parameter and the conduction time length; the conducting time length is the time length of the first scanning signal line output conducting level obtained by white balance adjustment under each target brightness parameter;
the luminescence phase specifically comprises:
and controlling a first scanning signal line to output the conducting level of the first conducting duration.
12. The driving method according to claim 10, wherein the target luminance parameter includes a light emission phase duty ratio and/or a gray scale level.
13. A display panel comprising the pixel driving circuit according to any one of claims 1 to 9.
14. The display panel according to claim 13, characterized by further comprising:
n pieces of the first scanning signal lines are sequentially arranged in a first direction, wherein N is an integer greater than or equal to 2;
and the first grid line driving circuit comprises N first scanning shift registers, and the output ends of the N first scanning shift registers are correspondingly connected with N first scanning signal lines in a one-to-one manner in the first direction.
15. The display panel according to claim 14, characterized by further comprising:
the second grid line driving circuit comprises N second scanning shift registers, and the output ends of the N second scanning shift registers are correspondingly connected with N first scanning signal lines in a one-to-one manner in the first direction;
the first gate line driving circuit and the second gate line driving circuit are respectively located at a first side and a second side of the display panel.
16. The display panel according to claim 13, characterized by further comprising:
n pieces of the first scanning signal lines are sequentially arranged in a first direction, wherein N is an integer greater than or equal to 2;
the scanning line driving chip comprises N scanning signal output ends, and the N scanning signal output ends are connected with the N first scanning signal lines in a one-to-one correspondence mode in the first direction.
17. A display device characterized by comprising the display panel according to any one of claims 13 to 16.
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