CN115035844A - Pixel circuit, driving method thereof and display panel - Google Patents
Pixel circuit, driving method thereof and display panel 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]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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Abstract
The invention discloses a pixel circuit, a driving method thereof and a display panel. The pixel circuit comprises a data writing module, a driving module, a storage module, a light emitting module and a current amplifying module; the data writing module is used for writing data voltage into the driving module; the storage module is used for maintaining the potential of the control end of the driving module; the driving module is used for generating a driving current according to the data voltage; the light emitting module is used for responding to the driving current to emit light; the current amplification module is connected to a driving current path between the driving module and the light emitting module, and is configured to increase current flowing through the light emitting module when the light emitting efficiency of the light emitting module is lower than a preset value. The invention can solve the problem of uneven heating of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel circuit, a driving method thereof and a display panel.
Background
With the development of display technology, the application of display panels is becoming more and more extensive, and the requirements for display panels are also becoming higher and higher.
The display panel includes a plurality of pixel circuits, and display is realized by light emission of light emitting units in the pixel circuits. However, the conventional display panel has a problem of uneven heat generation, and further application of the display panel is limited.
Disclosure of Invention
The invention provides a pixel circuit, a driving method thereof and a display panel, and aims to solve the problem of uneven heating of the display panel.
According to an aspect of the present invention, there is provided a pixel circuit including: the device comprises a data writing module, a driving module, a storage module, a light emitting module and a current amplifying module;
the data writing module is used for writing data voltage into the driving module; the storage module is used for maintaining the electric potential of the control end of the driving module; the driving module is used for generating a driving current according to the data voltage; the light emitting module is used for responding to the driving current to emit light;
the current amplification module is connected to a driving current path between the driving module and the light emitting module, and is configured to increase current flowing through the light emitting module when the light emitting efficiency of the light emitting module is lower than a preset value.
According to another aspect of the present invention, there is provided a driving method of a pixel circuit, for driving the pixel circuit, the driving method of the pixel circuit including:
judging whether the luminous efficiency of the luminous module is lower than a preset value or not;
and if the luminous efficiency of the luminous module is lower than a preset value, the current flowing through the luminous module is increased through the current amplification module.
According to another aspect of the present invention, there is provided a display panel including a plurality of the pixel circuits described above.
According to the technical scheme of the embodiment of the invention, the current amplification module is added on the driving current path between the driving module and the light-emitting module of the pixel circuit, when the light-emitting efficiency of the light-emitting module is lower than a preset value, the current flowing through the light-emitting module can be increased, so that the light-emitting efficiency of the light-emitting module is increased, the light-emitting efficiency of each sub-pixel in the display panel is consistent, and the phenomenon of uneven heating is improved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit structure diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a pixel circuit according to another embodiment of the present invention;
fig. 6 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 7 is a timing diagram of a pixel circuit according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 9 is a schematic circuit diagram of a pixel circuit according to yet another embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a pixel circuit according to another embodiment of the present invention;
fig. 11 is a schematic circuit diagram of a pixel circuit according to yet another embodiment of the present invention;
fig. 12 is a schematic circuit diagram of a pixel circuit according to yet another embodiment of the present invention;
FIG. 13 is a timing diagram of FIG. 12;
fig. 14 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 15 is a timing diagram of FIG. 14;
fig. 16 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention;
fig. 17 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As mentioned in the background art, the conventional display panel has a problem of uneven heat generation, and the inventors have found through careful study that the reason for this technical problem is: the display panel usually includes three color sub-pixels, namely a red sub-pixel, a green sub-pixel and a blue sub-pixel. However, the light emitting efficiency of the three color sub-pixels is not uniform, for example, the light emitting efficiency of the red sub-pixel is low, that is, the gray scale display is not enough, thereby causing uneven heat generation of the three color sub-pixels.
In view of the above technical problem, the present embodiment proposes the following solutions:
fig. 1 is a schematic circuit structure diagram of a pixel circuit according to an embodiment of the present invention, and referring to fig. 1, the pixel circuit includes: a data writing module 101, a driving module 102, a storage module 103, a light emitting module 104 and a current amplifying module 105; the data writing module 101 is configured to write a data voltage Vdata into the driving module 102; the storage module 103 is used for maintaining the potential of the control end of the driving module 102; the driving module 102 is configured to generate a driving current according to the data voltage Vdata; the light emitting module 104 is used for emitting light in response to the driving current; the current amplifying module 105 is connected to a driving current path between the driving module 102 and the light emitting module 104, and the current amplifying module 105 is configured to increase a current flowing through the light emitting module when the light emitting efficiency of the light emitting module 104 is lower than a preset value.
Specifically, the light emitting unit 104 may be, for example, a micro led, a MiniLED, an OLED, or the like, and the light emitting unit 104 is a current type device capable of emitting light in response to a driving current, so as to implement display; the specific light-emitting principle of the light-emitting unit 104 is well known to those skilled in the art and will not be described herein. The data writing module 101 can write the data voltage Vdata into the driving module 101 under the control of the scanning signal, the data voltages Vdata corresponding to different display gray scales are different, and the driving module 101 generates different driving currents according to the different data voltages Vdata, so that the light emitting module 104 emits light corresponding to the gray scales. The light emitting module 104 is a current type device, and a current path is required to be provided when emitting light, and the driving module 102 and the light emitting module 104 can be connected in series between the first power signal terminal PVDD and the second power signal terminal PVEE. It should be noted that the dashed lines in fig. 1 represent that there may be other components in the path. Two structures of the pixel circuit are explained first;
as shown in fig. 2, fig. 2 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention, in this embodiment, a first terminal of a data writing module 101 is connected to a data voltage Vdata, a second terminal of the data writing module 101 is electrically connected to a control terminal of a driving module 102, and the control terminal of the data writing module 101 is connected to a first scan signal S2; a first end of the driving module 102 is connected to the first power signal PVDD, and a second end of the driving module 102 is electrically connected to a first end of the light emitting module 104 through the current amplifying module 105; a second end of the light emitting module 104 is connected to a second power signal PVEE; a first end of the memory module 103 is electrically connected to a first end of the driving module 102, and a second end of the memory module 103 is electrically connected to a control end of the driving module 102.
When display is required, the second scan signal S2 controls the data writing module 101 to be turned on, so that the data voltage Vdata is written into the control terminal of the driving module 102, and the driving module 102 generates a corresponding driving current according to the potential of the control terminal, thereby controlling the light emitting module 104 to emit light corresponding to gray scale. After the data writing module 101 is turned off, the storage module 103 maintains the potential of the control terminal of the driving module 102, so that the driving module 102 can continuously generate the driving current and the light emitting module 104 can continuously emit light. As shown in fig. 3, fig. 3 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention, in the following description, transistors are all P-type transistors, but may be N-type transistors in other embodiments; one of the first pole and the second pole of the transistor is a source, the other is a drain, and the control pole is a grid. The data writing block 101 includes a first transistor T1, a first terminal of the first transistor T1 is used as a first terminal of the data writing block 101, a second terminal of the first transistor T1 is used as a second terminal of the data writing block 101, and a control terminal of the first transistor T1 is used as a control terminal of the data writing block 101. The driving module 102 includes a second transistor T2, a first pole of the second transistor T2 is used as a first terminal of the driving module 102, a second pole of the second transistor T2 is used as a second pole of the driving module 102, and a control pole of the second transistor T2 is used as a control terminal of the driving module 102. The memory module 103 includes a capacitor C1, a first terminal of the capacitor C1 is a first terminal of the memory module 103, and a second terminal of the capacitor C1 is a second terminal of the memory module 103.
The pixel circuit shown in fig. 2 and 3, also commonly referred to in the art as a "2T 1C" pixel circuit, has a simple structure but does not have a threshold compensation function; a pixel circuit with a threshold compensation function will be described below.
Fig. 4 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention, fig. 5 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention, and the operating principles of the pixel circuits in fig. 4 and fig. 5 are the same, except for the position of the current amplifying module 105, and the structures and the operating principles of the two circuits are first introduced together. The pixel circuit further comprises a first light-emitting control module 106, a second light-emitting control module 107 and a threshold compensation module 108; a first end of the data writing module 101 is connected to a data voltage Vdata, a second end of the data writing module 101 is electrically connected to a first end of the driving module 102, and a control end of the data writing module 101 is connected to a first scanning signal S2; a first end of the first lighting control module 106 is connected to the first power signal PVDD (it should be noted that, for convenience of description, in this embodiment, the signal and a port for inputting the signal are represented by the same identifier), and a control end of the first lighting control module 106 is connected to the lighting control signal Emit; a first end of the storage module 103 is electrically connected with a first end of the first light-emitting control module 106, and a second end of the storage module 103 is electrically connected with a control end of the driving module 102; a first end of the threshold compensation module 108 is electrically connected to the control end of the driving module 102, a second end of the threshold compensation module 108 is electrically connected to the control end of the driving module 102, and the control end of the threshold compensation module 108 is connected to the first scanning signal S1; a first end of the second light-emitting control module 107 is electrically connected with a second end of the driving module 102, a second end of the second light-emitting control module 107 is electrically connected with a first end of the light-emitting module 104, and a control end of the second light-emitting control module 107 is connected with a light-emitting control signal Emit; a second end of the light emitting module 104 is connected to a second power signal PVEE; in fig. 4, a first end of the second light emitting control module 107 is electrically connected to a second end of the driving module 102 through the current amplifying module 105; in fig. 5, the second terminal of the second light emission control module 107 is electrically connected to the first terminal of the light emitting module 104 through the current amplifying module 105. The pixel circuit may further include an initialization module for initializing the first terminal of the light emitting module, and/or initializing the control terminal of the driving module; the initialization module may include a first initialization module 109 and a second initialization module 110, a first end of the first initialization module 109 is connected to the initialization signal Vref, a second end of the first initialization module 109 is electrically connected to the control end of the driving module 102, and the control end of the first initialization module 109 is connected to the second scan signal S1; the first terminal of the second initialization module 110 is connected to the initialization signal Vref, the second terminal of the second initialization module 110 is electrically connected to the first terminal of the light emitting module 104, and the control terminal of the second initialization module 110 is connected to the second scan signal S1. Fig. 6 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention, and fig. 7 is a timing diagram of a pixel circuit according to an embodiment of the present invention; the pixel circuit shown in fig. 6 is only used for illustrating other components in the pixel circuit except for the current amplification module 105, and it is understood that the specific structure of each module in fig. 6 may correspond to fig. 4 or fig. 5; the operating principle shown in fig. 7 may correspond to the pixel circuit of any one of fig. 4 to 6; the first light emitting control module 106 includes a third transistor T3, a first pole of the third transistor T3 is used as a first terminal of the first light emitting control module 106, a second pole of the third transistor T3 is used as a second terminal of the first light emitting control module 106, and a control pole of the third transistor T3 is used as a control terminal of the first light emitting control module 106; the second light emission control module 107 includes a fourth transistor T4, a first pole of the fourth transistor T4 is a first terminal of the second light emission control module 107, a second pole of the fourth transistor T4 is a second terminal of the second light emission control module 107, and a control pole of the fourth transistor T4 is a control pole of the second light emission control module 107. The threshold compensation module 108 includes a fifth transistor T5, a first pole of the fifth transistor T5 is used as a first terminal of the threshold compensation module 108, a second pole of the fifth transistor T5 is used as a second terminal of the threshold compensation module 108, and a control pole of the fifth transistor T5 is used as a control terminal of the threshold compensation module 108. The first initialization module 109 includes a sixth transistor T6, a first pole of the sixth transistor T6 is used as a first terminal of the first initialization module 109, a second pole of the sixth transistor T6 is used as a second terminal of the first initialization module 109, and a control pole of the sixth transistor T6 is used as a control terminal of the first initialization module 109. The second initialization block 110 includes a seventh transistor T7, a first pole of the seventh transistor T7 serving as a first terminal of the second initialization block 110, a second pole of the seventh transistor T7 serving as a second terminal of the second initialization block 110, and a control pole of the seventh transistor T7 serving as a control terminal of the second initialization block 110. The driving process of the pixel circuit includes an initialization phase t1, a data writing phase t2 and a light emitting phase t 3; in the initialization stage T1, the second scan signal S1 is low, the first scan signal S2 is high, the sixth transistor T6 and the seventh transistor T7 are turned on, the other transistors are turned off, the initialization signal Vref is written into the gate of the second transistor T2 through the sixth transistor T6, the residual potential of the previous frame is eliminated, and the second transistor T2 is turned on conveniently in the next stage; the initialization signal Vref is written into the first terminal of the light emitting module 104 through the seventh transistor T7, the first terminal of the light emitting module 104 may be an anode, and the second terminal may be a cathode, which may also eliminate the influence of the charges remaining in the previous frame and eliminate the afterimage phenomenon. In the data writing period T2, the first scan signal S2 is at a low level, the second scan signal S1 is at a high level, the sixth transistor T6 and the seventh transistor T7 are turned off, and the third transistor T3 and the fourth transistor T4 are also turned off under the control of the emission control signal Emit; the first transistor T1 and the fifth transistor T5 are turned on under the control of the first scan signal S2, the data voltage Vdata is written into the control electrode of the second transistor T2 after passing through the first transistor T1, the second transistor T2 and the fifth transistor T5, when the difference between the voltage of the control electrode of the second transistor T2 and the second electrode voltage of the second transistor T2 is equal to the threshold voltage of the second transistor T2, the second transistor T2 is turned off, that is, the voltage of the control electrode of the second transistor T2 is Vdata- | Vth |, Vth is the threshold voltage of the second transistor T2, and the capacitor C1 stores the voltage. In the emission phase T3, the emission control signal Emit is toggled to the low level, the second transistor T2, the third transistor T3 and the fourth transistor T4 are turned on, and the driving current I ═ K (Vgs-Vth) ^2 ═ K (Vsg- | Vth |) ^2 ═ K [ PVDD- (Vdata- | Vth |) - | ] | 2 ═ K of the second transistor T2 according to the current formula of the transistors
K (PVDD-Vdata) ^ 2. K is constant, that is, the driving current is independent of the threshold voltage of the second transistor T2, thereby implementing the threshold compensation function.
The current amplifying module 105 is connected to a driving current path between the driving module 102 and the light emitting module 104, that is, between the second end of the driving module 102 and the first end of the light emitting module 104. When the light emitting efficiency of the light emitting module 104 is insufficient, that is, the real display gray scale is lower than the gray scale to be displayed, the current amplifying module 105 may increase the current flowing through the light emitting module 104, which is equivalent to an increase of the driving current flowing through the light emitting module 104, so that the gray scale displayed by the light emitting module 104 is increased, and further the light emitting efficiency of the light emitting module 104 is increased, so that the light emitting efficiency of each sub-pixel in the display panel is consistent, and the phenomenon of uneven heating is improved. It should be noted that, different preset values corresponding to different gray scales to be displayed are different, and the specific numerical value of the preset value is not required in this embodiment.
According to the technical scheme of the embodiment, the current amplification module is additionally arranged on the driving current path between the driving module and the light emitting module of the pixel circuit, when the luminous efficiency of the light emitting module is lower than a preset value, the current flowing through the light emitting module can be increased, so that the luminous efficiency of the light emitting module is increased, the luminous efficiency of each sub-pixel in the display panel is consistent, and the phenomenon of uneven heating is improved.
The following describes a specific structure of the current amplification module.
Fig. 8 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention, and referring to fig. 8, the current amplifying module 105 includes a first switch unit 1052, a second switch unit 1051 and a current amplifying unit 1053, and a series structure of the first switch unit 1052 and the current amplifying unit 1053 is connected between the light emitting module 104 and the driving module 102; the second switching unit 1051 is connected in parallel with the series arrangement, and the first switching unit 1052 and the second switching unit 1051 are in different switching states.
Specifically, a first terminal of the first switch unit 1052 is electrically connected to a first terminal of the second switch unit 1051, a second terminal of the first switch unit 1052 is electrically connected to a first terminal of the current amplifying unit 1053, and a control terminal of the first switch unit 1052 is connected to the first switch signal SW 2; a second end of the second switch unit 1051 is electrically connected to a second end of the current amplifying unit 1053, and a control end of the second switch unit 1051 is connected to a second switch signal SW 1; the current amplification unit 1053 is used to increase the current flowing through the light emitting module 104; when the light emitting efficiency of the light emitting module 104 needs to be increased, the first switch unit 1052 is turned off under the control of the first switch signal SW2, and the second switch unit 1051 is turned on under the control of the second switch signal SW 1; the current amplifying unit 105 does not function, and the driving current flows into the light emitting module 104 through the second switching unit 1051; when it is required to increase the light emitting efficiency of the light emitting module 104, the second switching unit 1051 is turned off under the control of the second switching signal SW1, and the first switching unit 1052 is turned on under the control of the first switching signal SW 2; the driving current flows from the driving module 102, passes through the current amplifying unit 1053, is amplified by the current amplifying unit 1053, and then flows into the light emitting module 104, thereby increasing the current flowing through the light emitting module 104. It should be noted that, the first switch unit 1052 and the current amplifying unit 1053 may be connected in series as shown in fig. 8, and the first switch unit 1051 and the current amplifying unit 1053 are sequentially connected in series between the driving module 102 and the light emitting module 104; as shown in fig. 9, fig. 9 is a schematic circuit diagram of a pixel circuit according to another embodiment of the present invention, and the current amplifying unit 1053 and the first switch unit 1052 are sequentially connected in series between the driving module 102 and the light emitting module 104.
Fig. 10 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention, and as shown in fig. 10, the first switch unit 1052 includes an eighth transistor T8, a first pole of an eighth transistor T8 is used as a first terminal of the first switch unit 1052, a second pole of an eighth transistor T8 is used as a second terminal of the first switch unit 1052, and a control pole of an eighth transistor T8 is used as a control terminal of the first switch unit 1052. The second switching unit 1051 includes a ninth transistor T9, a first pole of the ninth transistor T9 as a first terminal of the second switching unit 1051, a second pole of the ninth transistor T9 as a second terminal of the second switching unit 1051, and a control pole of the ninth transistor T9 as a control terminal of the second switching unit 1051. The current amplification unit comprises a buffer circuit 10531, the buffer 10531 comprises a plurality of not gates connected in series, the input end of the first stage of not gates is used as the first end of the current amplification unit, and the output end of the last stage of not gates is used as the second end of the current amplification unit. The current flowing through the light emitting module 104 can be increased by the buffer circuit 10531 in this embodiment. Specifically, in the present embodiment, the eighth transistor T8 and the ninth transistor T9 may be N-type transistors.
Alternatively, fig. 11 is a circuit structure diagram of another pixel circuit according to an embodiment of the invention, as shown in fig. 11, the current amplifying unit is an operational amplifier circuit 10532, the operational amplifier circuit 10532 may include a first operational amplifier resistor R1, an operational amplifier a1 and a second operational amplifier resistor R2, an inverting input terminal of the operational amplifier a1 is electrically connected to the second pole of the eighth transistor T8, a positive input terminal of the operational amplifier a1 is grounded through the second operational amplifier resistor R2, and an output terminal of the operational amplifier a1 is electrically connected to the second pole of the ninth transistor T9. In the present embodiment, the inverting input terminal of the operational amplifier a1 serves as the first terminal of the current amplifying unit, and the output terminal of the operational amplifier a1 serves as the second terminal of the current amplifying unit. The current flowing through the light emitting module 104 can be increased by the operational amplifier circuit in the present embodiment. Of course, this embodiment only illustrates one kind of operational amplifier circuit, and it may be replaced with another kind of operational amplifier circuit. The current amplifying unit may also employ an amplifying circuit in the form of a differential amplifying circuit or a source follower circuit or the like.
Optionally, fig. 12 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention, referring to fig. 12, the pixel circuit further includes a first control unit 201, and the first control unit 201 is configured to detect a voltage of the light emitting module 104 and control a conducting degree of the first switch unit 1052 according to the voltage of the light emitting module 104.
Specifically, the first control unit 201 may be a driving chip in the display panel. As shown in fig. 13, fig. 13 is the timing diagram of fig. 12, DET represents the voltage detected by the first control unit 201, when DET is determined to be normal, the first control unit 201 controls the first switch signal SW2 to be low level, the first switch unit 1052 is turned off, and controls the second switch signal SW1 to be high level, the second switch unit 1051 is turned on, and the driving current flows into the light emitting module 104 through the second switch unit 1051. When the DET is determined to be low, the first control unit 201 controls the first switch signal SW2 to be high, the first switch unit 1052 is turned on, controls the second switch signal SW1 to be low, controls the second switch unit SW1 to be off, and controls the level of the first switch signal SW2 to gradually increase, that is, the on degree of the first switch unit 1052 is gradually deepened at this time, and the current flowing through the light emitting module 104 is also gradually increased. When the DET is determined to reach the set value, the level of the first switch signal SW2 is not increased, and the current flowing through the light emitting module 104 is not increased, thereby preventing the current of the light emitting module from being overcompensated.
Optionally, fig. 14 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention, and referring to fig. 14, the current amplifying module includes: a resistor R3, a third switching unit 1054, a second control unit 202, and an adjustable power supply VDD; the resistor R3 and the third switching unit 1054 are connected in series between the light emitting module 1054 and the adjustable power supply; the second control unit 202 is configured to detect the voltage of the light emitting module 104 and control the output voltage of the adjustable power supply according to the voltage of the light emitting module 104.
Specifically, fig. 15 is a timing diagram of fig. 14, and in this embodiment, the second control unit 202 may be a driving chip in the display panel. The adjustable power supply VDD can be a GPIO port in the display panel, and the voltage of the adjustable power supply VDD can be dynamically adjusted. The third switching unit 1054 includes a tenth transistor T10, a first pole of the tenth transistor T10 is electrically connected to the first terminal of the light emitting module 104, a second pole of the tenth transistor T10 is connected to the adjustable power VDD through a resistor R3, a control terminal of the tenth transistor T10 is connected to the third switching signal SW3, and the tenth transistor T10 may be an N-type transistor. When the DET is determined to be normal, the second control unit 202 controls the third switching signal SW3 to be low, the third switching unit 1054 is turned off, and only the driving current flows into the light emitting module 104. When the DET is determined to be low, the second control unit 202 controls the third switching signal SW3 to be at a high level, the third switching unit 1054 is turned on, and the level of the third switching signal SW3 is gradually increased, that is, the turning-on degree of the third switching unit 1054 is gradually increased, and the current flowing through the light emitting module 104 is also gradually increased. When the DET is determined to reach the set value, the level of the third switch signal SW3 is not increased, and the current flowing through the light emitting module 104 is not increased, thereby preventing the current of the light emitting module from being overcompensated. In this embodiment, assuming that the driving current output from the driving module 102 is I1, and the current flowing through the resistor R3 is I2, the current flowing through the light emitting module 104 after compensation is I1+ I2, I2 is (VDD-V2)/R3, the resistor R can be made high-precision and low-resistance, and VDD is a dynamically adjustable voltage, so that sufficient compensation current I2 can be obtained as long as VDD and R3 are sufficiently small, and thus the extra power consumption P is relatively small (VDD-V2) — I2. Where V2 is the detected DET voltage.
The invention further provides a driving method of a pixel circuit, as shown in fig. 16, and fig. 16 is a flowchart of the driving method of the pixel circuit according to the embodiment of the invention. The driving method is used for driving the pixel circuit provided by any embodiment of the invention, and comprises the following steps:
step S110, judging whether the luminous efficiency of the luminous module is lower than a preset value;
specifically, for example, whether the light emitting current of the light emitting module is lower than a first preset value, or whether the voltage of the light emitting module is lower than a second preset value, or whether the display brightness of the light emitting module is lower than a third preset value may be detected by a driving chip in the display panel. The specific values of the first preset value, the second preset value and the third preset value can be set according to different gray scales to be displayed.
In step S120, the current flowing through the light emitting module is increased by the current amplifying module.
Specifically, when the luminous efficiency of the light emitting module is insufficient, that is, the real display gray scale is lower than the gray scale to be displayed, the current amplifying module can increase the current flowing through the light emitting module, which is equivalent to increase the driving current flowing through the light emitting module, so that the gray scale displayed by the light emitting module is increased, and further the luminous efficiency of the light emitting module is increased, so that the luminous efficiency of each sub-pixel in the display panel is consistent, and the phenomenon of uneven heating is improved.
According to the technical scheme of the embodiment, when the luminous efficiency of the luminous module is lower than the preset value, the current amplification module is used for increasing the current flowing through the luminous module, so that the luminous efficiency of the luminous module is increased, the luminous efficiency of each sub-pixel in the display panel is consistent, and the phenomenon of uneven heating is improved.
Fig. 17 is a schematic structural diagram of a display panel according to an embodiment of the present invention, where the display panel includes a plurality of pixel circuits according to any embodiment of the present invention. The display panel may include scan lines and data lines (DL1-DLn) staggered horizontally and vertically, the scan lines being used for providing corresponding first, second and third scan signals, the scan lines being electrically connected to the scan driving circuit 30, the data lines being electrically connected to the data driving circuit 20, the display panel may further include a light emission control signal generating circuit 40 and corresponding enable signal lines (EM1-EMk), the light emission control signal generating circuit 40 generating the second enable signal in the embodiment of the present invention; the display panel may be, for example, a display panel on a mobile phone, a tablet, a display, an MP3, an MP4, a smart watch, a smart helmet, or other wearable devices, and therefore, the display panel includes the pixel driving circuit provided in any embodiment of the present invention, and therefore, the same advantageous effects are also provided, and details are not described herein again.
Optionally, the light emitting color of the light emitting module in the pixel circuit is red. Specifically, the red sub-pixel is prone to have a problem of insufficient light-emitting efficiency, and therefore, in this embodiment, the current amplification module may be disposed only in the pixel circuit corresponding to the red sub-pixel; the pixel circuits corresponding to the blue sub-pixel and the green sub-pixel do not need to be provided with a current amplification module.
Optionally, the display panel further includes a green pixel circuit whose light emission color of the light emitting module is green, and a blue pixel circuit whose light emission color of the light emitting module is blue; the driving module and the light-emitting module of each pixel circuit are connected in series between a first power signal end and a second power signal end, the first power signal end is used for inputting a first power signal, and the second power signal end is used for inputting a second power signal; the display panel further comprises a first power supply signal line, a second power supply signal line, a third power supply signal line, a fourth power supply signal line, a fifth power supply signal line and a sixth power supply signal line; in the red pixel circuit, a first power supply signal is supplied by a first power supply signal line, and a second power supply signal is supplied by a second power supply signal line; in the blue pixel circuit, the first power supply signal is supplied by the third power supply signal line, and the second power supply signal is supplied by the fourth power supply signal line; in the green pixel circuit, the first power supply signal is supplied from the fifth power supply signal line, and the second power supply signal is supplied from the sixth power supply signal line. In this embodiment, the first power signals of the pixel circuits corresponding to the sub-pixels with different colors are not provided by the same power signal line, and the second power signals are not provided by the same power signal line, so that the pixel circuits corresponding to the light-emitting modules with different colors can be independently controlled, the degree of freedom of adjustment is further increased, and the light-emitting efficiency of the light-emitting modules with different colors can be ensured to be consistent. Wherein, the first power supply signal and the second power supply signal of different pixel circuits can be within +/-4.5V.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A pixel circuit, comprising: the device comprises a data writing module, a driving module, a storage module, a light emitting module and a current amplifying module;
the data writing module is used for writing data voltage into the driving module; the storage module is used for maintaining the electric potential of the control end of the driving module; the driving module is used for generating a driving current according to the data voltage; the light emitting module is used for responding to the driving current to emit light;
the current amplification module is connected to a driving current path between the driving module and the light emitting module, and is configured to increase current flowing through the light emitting module when the light emitting efficiency of the light emitting module is lower than a preset value.
2. The pixel circuit according to claim 1, wherein the current amplification module comprises a first switching unit, a second switching unit, and a current amplification unit, and a series structure of the first switching unit and the current amplification unit is connected between the light emitting module and the driving module; the second switch unit is connected in parallel with the series structure, and the switch states of the first switch unit and the second switch unit are different.
3. The pixel circuit according to claim 2, wherein the current amplifying unit is a buffer circuit or an operational amplifier circuit.
4. The pixel circuit according to claim 2, further comprising a first control unit configured to detect a voltage of the light emitting module and control a conduction degree of the first switch unit according to the voltage of the light emitting module.
5. The pixel circuit according to claim 1, wherein the current amplification module comprises:
the resistor, the third switching unit, the adjustable power supply and the second control unit; the resistor and the third switching unit are connected in series between the light-emitting module and the adjustable power supply;
the second control unit is configured to detect a voltage of the light emitting module and control an output voltage of the adjustable power supply according to the voltage of the light emitting module.
6. The pixel circuit according to claim 1, wherein a first terminal of the data writing module is connected to the data voltage, a second terminal of the data writing module is electrically connected to the control terminal of the driving module, and the control terminal of the data writing module is connected to a first scan signal;
a first end of the driving module is connected with a first power supply signal, and a second end of the driving module is electrically connected with a first end of the light-emitting module through the current amplification module; a second end of the light emitting module is connected to a second power supply signal; the first end of the storage module is electrically connected with the first end of the driving module, and the second end of the storage module is electrically connected with the control end of the driving module.
7. The pixel circuit according to claim 1, further comprising a first light emission control module, a second light emission control module, and a threshold compensation module; a first end of the data writing module is connected with the data voltage, a second end of the data writing module is electrically connected with a first end of the driving module, and a control end of the data writing module is connected with a first scanning signal;
a first end of the first light-emitting control module is connected with a first power supply signal, a second end of the first light-emitting control module is electrically connected with a first end of the driving module, and a control end of the first light-emitting control module is connected with a light-emitting control signal;
the first end of the storage module is electrically connected with the first end of the first light-emitting control module, and the second end of the storage module is electrically connected with the control end of the driving module;
the first end of the threshold compensation module is electrically connected with the second end of the driving module, the second end of the threshold compensation module is electrically connected with the control end of the driving module, and the control end of the threshold compensation module is accessed into the first scanning signal;
the first end of the second light-emitting control module is electrically connected with the second end of the driving module, the second end of the second light-emitting control module is electrically connected with the first end of the light-emitting module, and the control end of the second light-emitting control module is connected into the light-emitting control signal; a second end of the light emitting module is connected to a second power supply signal;
the first end of the second light-emitting control module is electrically connected with the second end of the driving module through the current amplification module, or the second end of the second light-emitting control module is electrically connected with the first end of the light-emitting module through the current amplification module.
8. The pixel circuit according to claim 7, further comprising an initialization module for initializing the first terminal of the light emitting module and/or initializing the control terminal of the driving module.
9. A driving method of a pixel circuit for driving the pixel circuit according to any one of claims 1 to 8, the driving method comprising:
judging whether the luminous efficiency of the luminous module is lower than a preset value or not;
and if the luminous efficiency of the luminous module is lower than a preset value, the current flowing through the luminous module is increased through the current amplification module.
10. The method for driving a pixel circuit according to claim 9, wherein the determining whether the luminous efficiency of the light emitting module is lower than a preset value comprises at least one of:
detecting whether the current flowing through the light emitting module is lower than a first preset value;
detecting whether the voltage of the light emitting module is lower than a second preset value;
and detecting whether the display brightness of the light-emitting module is lower than a third preset value by using optical equipment.
11. A display panel comprising a plurality of pixel circuits according to any one of claims 1 to 8.
12. The display panel according to claim 11, wherein the pixel circuit is a red pixel circuit, and wherein a light emitting color of a light emitting module in the red pixel circuit is red.
13. The display panel according to claim 12, wherein the display panel further comprises a green pixel circuit whose light emission color of the light emitting module is green, and a blue pixel circuit whose light emission color of the light emitting module is blue; the driving module and the light-emitting module of each pixel circuit are connected in series between a first power signal end and a second power signal end, the first power signal end is used for inputting a first power signal, and the second power signal end is used for inputting a second power signal; the display panel further includes a first power supply signal line, a second power supply signal line, a third power supply signal line, a fourth power supply signal line, a fifth power supply signal line, and a sixth power supply signal line; in the red pixel circuit, a first power supply signal is supplied by a first power supply signal line, and a second power supply signal is supplied by a second power supply signal line; in the blue pixel circuit, a first power supply signal is supplied by a third power supply signal line, and a second power supply signal is supplied by a fourth power supply signal line; in the green pixel circuit, the first power supply signal is supplied by the fifth power supply signal line, and the second power supply signal is supplied by the sixth power supply signal line.
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