CN114944134B - Pixel driving circuit, method and display panel - Google Patents
Pixel driving circuit, method and display panel Download PDFInfo
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- CN114944134B CN114944134B CN202210506674.3A CN202210506674A CN114944134B CN 114944134 B CN114944134 B CN 114944134B CN 202210506674 A CN202210506674 A CN 202210506674A CN 114944134 B CN114944134 B CN 114944134B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The application relates to a pixel driving circuit, a method and a display panel, wherein the pixel driving circuit drives a display unit through a certain sub-light-emitting circuit, threshold voltage of the sub-light-emitting circuit changes, when current passing through the display unit exceeds a threshold value, the sub-light-emitting circuit supplying power to the display unit is switched, so that the other sub-light-emitting circuit supplies power to the display unit, stable current which does not exceed the threshold value is provided for the display unit, and the problem that when the threshold voltage fluctuates, the power is continuously supplied to the display unit through the sub-light-emitting circuit with fluctuation of the threshold voltage, and adverse effects are continuously caused to the display unit is avoided.
Description
Technical Field
The present disclosure relates to the field of display panels, and particularly to a pixel driving circuit, a pixel driving method, and a display device panel.
Background
With the development of related technologies, display technologies from liquid crystal displays (Liquid Crysta lDisplay, LCDs) to light Emitting diodes (light Emitting Diode, LEDs) and from LEDs to organic light-Emitting diodes (OLEDs), OLED display devices have characteristics of self-luminescence, simple structure, ultra-light weight, fast response speed, wide viewing angle, low power consumption, and realization of flexible display, and thus are widely used in the display field.
In the related art, an OLED generally performs current driving control on the OLED by a light emitting circuit, and when a thin film transistor (Thin film transistor, TFT) on the light emitting circuit works for a long time or works in other environments, the characteristics of the TFT change, so that the threshold voltage changes, the leakage current changes, so that the current transmitted by the driving current fluctuates, and adverse effects on the OLED are caused; therefore, how to reduce the current fluctuation through the OLED, and thus reduce the adverse effect on the OLED, is a need for solving the problem.
Disclosure of Invention
The application provides a pixel driving circuit, a pixel driving method and a display device panel, which are used for solving the problem that in the related art, the current passing through a display unit is increased, so that adverse effects are caused on the display unit.
In a first aspect, the present application provides a pixel driving circuit, the pixel driving circuit comprising: the display device comprises a light-emitting circuit and a control circuit, wherein the light-emitting circuit comprises at least two sub light-emitting circuits, and the light-emitting circuit is connected with a display unit and is used for supplying power to the display unit through any sub light-emitting circuit; the control circuit is respectively connected with the light-emitting circuit and the display unit; the control circuit is used for detecting the current passing through the display unit when the light-emitting circuit supplies power to the display unit through any one of the sub light-emitting circuits; when the current through the display unit exceeds a threshold value, the control circuit switches the sub-light emitting circuit that supplies power to the display unit.
Optionally, a first thin film transistor is disposed on each sub-light emitting circuit, and a control end of the first thin film transistor is connected with the control circuit, and is used for switching on or off the sub-light emitting circuit according to a control signal transmitted by the control circuit, so as to switch the sub-light emitting circuit for supplying power to the display unit.
Optionally, the control circuit includes: the input end of the comparator is connected with the ground resistor and the reference voltage end respectively, the input end of the trigger is connected with the output end of the comparator, and the output end of the trigger is connected with the light-emitting circuit; the comparator is used for comparing the voltage of the grounding resistor with the reference voltage, and when the voltage of the grounding resistor exceeds the reference voltage, the comparator outputs a first comparison signal to control the trigger to trigger the switching of the sub-lighting circuit for supplying power to the display unit.
Optionally, the trigger includes at least two output ends, the output ends of the trigger are connected with the sub-light-emitting circuits in a one-to-one correspondence, and the trigger outputs a control signal through one output end; when the current passing through the display unit exceeds a threshold value, the trigger switches an input end outputting the control signal so as to switch the sub-light-emitting circuit for supplying power to the display unit.
Optionally, a second thin film transistor is disposed on each sub-light emitting circuit, the control end of the second thin film transistor is connected to the data signal circuit, the first end of the second thin film transistor is connected to the second end of the first thin film transistor, and the second end of the second thin film transistor is connected to the display unit; the second thin film transistor is used for conducting the sub-light-emitting circuit according to the data signal transmitted by the data signal circuit.
Optionally, a third thin film transistor is disposed on the data signal circuit, and a control end of the third thin film transistor is connected to a scanning signal, so as to turn on or off the data signal circuit according to the scanning signal.
Optionally, the control circuit is connected to an anode of the display unit to detect a current through the display unit.
In a second aspect, the present application provides a pixel driving method applied to the pixel driving circuit as set forth in any one of the above, the pixel driving method comprising: detecting the current passing through the display unit by a control circuit; when the current passing through the display unit exceeds a threshold value, a light emitting circuit for supplying power to the display unit is switched by the control circuit.
In a third aspect, there is provided a display panel including: a substrate on which a plurality of sub-pixels are provided, at least one of the sub-pixels comprising a display unit and a pixel drive circuit as claimed in any one of the preceding claims, the display unit and the pixel drive circuit being connected.
Optionally, the display unit includes: a red light display unit, a green light display unit and a blue light display unit; or, the display unit includes a red light display unit, a green light display unit, a blue light display unit, and a yellow light display unit.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the pixel driving circuit provided in the embodiment of the application includes: the display device comprises a display unit, a light emitting circuit and a control circuit, wherein the light emitting circuit comprises at least two sub light emitting circuits, and the light emitting circuit is connected with the display unit and is used for supplying power to the display unit through any one of the sub light emitting circuits; the control circuit is respectively connected with the light-emitting circuit and the display unit; the control circuit is used for detecting the current passing through the display unit when the light-emitting circuit supplies power to the display unit through any one of the sub light-emitting circuits; when the current passing through the display unit exceeds a threshold value, the control circuit switches the sub-light-emitting circuit for supplying power to the display unit; when a certain sub-light-emitting circuit drives the display unit and the threshold voltage of the sub-light-emitting circuit changes, and the current passing through the display unit exceeds the threshold value, the sub-light-emitting circuit supplying power to the display unit is switched, so that the other sub-light-emitting circuit supplies power to the display unit and provides stable current which does not exceed the threshold value for the display unit, the problem that when the threshold voltage fluctuates, the sub-light-emitting circuit continuously supplies power to the display unit through the fluctuation of the threshold voltage and the adverse effect is continuously caused to the display unit is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a basic structure of an alternative pixel driving circuit according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of an alternative sub-lighting circuit according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a basic structure of an alternative control circuit according to a first embodiment of the present disclosure;
FIG. 4 is a basic schematic of an alternative flip-flop provided in accordance with an embodiment of the present application;
FIG. 5 is a basic schematic of yet another alternative trigger provided in accordance with a first embodiment of the present application;
FIG. 6 is a schematic diagram of yet another alternative sub-lighting circuit according to a first embodiment of the present disclosure;
fig. 7 is a schematic diagram of a basic structure of an alternative pixel driving circuit according to a second embodiment of the present disclosure;
fig. 8 is a schematic diagram of a basic structure of an alternative control circuit according to a second embodiment of the present application;
fig. 9 is a basic schematic diagram of a pixel driving method according to a third embodiment of the present application;
fig. 10 is a schematic diagram of a basic structure of a display panel according to a fourth embodiment of the present disclosure;
fig. 11 is a schematic structural diagram of a display device according to a fifth embodiment of the present application;
reference numerals illustrate:
1-a light emitting circuit; 10-sub-lighting circuits; 11-a first thin film transistor; 12-a second thin film transistor; 2-a control circuit; 21-resistance to ground; a 22-comparator; a 23-trigger; 230-output; a 3-display unit; a 4-data signal circuit; 41-a third thin film transistor; a 5-pixel driving circuit; 6-a substrate; 7-subpixels; vd-operating voltage; vdd-supply voltage; vref—reference voltage; a T signal input terminal; c1-a clock signal input; q-a first output; q non-second output; scan-Scan signal; c-storage capacitor.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Example 1
In order to solve the problem of adverse effect on the display unit 3 caused by the fluctuation of the current passing through the display unit 3 in the related art, referring to fig. 1, fig. 1 is a schematic diagram of a pixel driving circuit 5 according to an embodiment of the present application, where the pixel driving circuit 5 includes, but is not limited to: a light-emitting circuit 1 and a control circuit 2, wherein the light-emitting circuit 1 comprises at least two sub light-emitting circuits 10, and the light-emitting circuit 1 is connected with the display unit 3 and is used for supplying power to the display unit 3 through any sub light-emitting circuit 10; the control circuit 2 is connected with the light-emitting circuit 1 and the display unit 3 respectively; the control circuit 2 is configured to detect a current passing through the display unit 3 when the light emitting circuit 1 supplies power to the display unit 3 through any one of the sub light emitting circuits 10; when the current through the display unit 3 exceeds a threshold value, the control circuit 2 switches the sub-light-emitting circuit 10 that supplies power to the display unit 3.
It should be understood that the present embodiment does not limit the number of sub-light-emitting circuits 10 included in the light-emitting circuit 1, and the number of sub-light-emitting circuits 10 may be flexibly set by a person concerned, and preferably the number of sub-light-emitting circuits 10 is 2, that is, two sub-light-emitting circuits 10 are included in the light-emitting circuit 1; meanwhile, the light emitting circuits 1 are connected to the anode of the display unit 3, that is, the respective sub light emitting circuits 10 are connected to the anode of the display unit 3, respectively; it will be appreciated that at the same time, the display unit 3 is powered by only one sub-light-emitting circuit 10, for example, the light-emitting circuit 1 includes A, B two sub-light-emitting circuits 10, and when the display unit 3 is required to emit light, the display unit 3 is driven to emit light by a or B.
In some examples of this embodiment, the control circuit 2 is connected to the anode of the display unit 3 to detect the current through the display unit 3; in some examples, the control circuit 2 may be connected to the cathode of the display unit 3 to detect the current through the display unit 3.
In some examples of the present embodiment, as shown in fig. 2, each of the sub-light emitting circuits 10 is provided with a first thin film transistor 11, and a control terminal of the first thin film transistor 11 is connected to the control circuit 2, and is configured to turn on or off the sub-light emitting circuit 10 according to a control signal transmitted by the control circuit 2, so as to switch the sub-light emitting circuit 10 that supplies power to the display unit 3; it should be understood that the first terminal of the first thin film transistor 11 is connected to the power voltage Vdd, the second terminal of the second thin film transistor 12 is connected to the anode of the display unit 3, and the first thin film transistor 11 is turned on from the first terminal to the second terminal, so that when the first thin film transistor 11 is turned on, a current is transmitted to the anode of the display unit 3.
It can be understood that if the first thin film transistor 11 of the same sub-light emitting circuit 10 is operated for a long time, the characteristics of the first thin film transistor 11 are changed, resulting in an increase of the current passing through the display unit 3; for example, when the display unit 3 is driven by continuously supplying power to the display unit 3 through a certain sub-light-emitting circuit 10 for a long time, the first thin film transistor 11 of the certain sub-light-emitting circuit 10 continuously works for a long time, so that the temperature of the first thin film transistor 11 is increased, the threshold voltage of the first thin film transistor 11 is reduced, the current leakage current is increased, the current transmitted by the sub-light-emitting circuit 10 is increased, the current passing through the display unit 3 is in an unstable state, the display unit 3 is unstable, the display effect is affected, and meanwhile, the current passing through the display unit 3 is increased, and the service life of the display unit 3 is affected; at this time, the control circuit 2 detects the current passing through the display unit 3, and when the current passing through the display unit 3 exceeds a threshold value, the control circuit 2 switches the sub-light emitting circuits 10 supplying power to the display unit 3, and since only one sub-light emitting circuit 10 supplies power to the display unit 3 at the same time, the switched sub-light emitting circuits 10 are necessarily in a normal state (the threshold voltage of the first thin film transistor 11 of the switched sub-light emitting circuit 10 does not change), so that when the power is supplied to the display unit 3 through the switched sub-light emitting circuits 10, the current passing through the display unit 3 is constant, the stability of the current passing through the display unit 3 is ensured, the display of the display unit 3 is stable, and the display effect is improved.
As can be appreciated from the above example, the present embodiment is not limited to the type of the first thin film transistor 11, and when the first thin film transistor 11 is an N-type thin film transistor, the control circuit 2 transmits a high-level control signal, the sub-light emitting circuit 10 is turned on, and when the control circuit 2 stops transmitting the control signal or transmits a low-level control signal, the first thin film transistor 11 is turned off; when the first thin film transistor 11 is a P-type thin film transistor, the sub-light emitting circuit 10 is turned on when the control circuit 2 transmits a low level control signal, and the first thin film transistor 11 is turned off when the control circuit 2 stops transmitting the control signal or transmits a high level control signal.
In some examples of the present embodiment, as shown in fig. 3, the control circuit 2 includes: the display device comprises a trigger 23, a ground resistor 21 and a comparator 22, wherein the ground resistor 21 is connected with the display unit 3, the input end of the comparator 22 is respectively connected with the ground resistor 21 and a reference voltage end, namely, the input end of the comparator is connected with a reference voltage Vref, the input end of the trigger 23 is connected with the output end 230 of the comparator 22, and the output end 230 of the trigger 23 is connected with the light-emitting circuit 1; the comparator 22 is configured to compare the voltage of the resistor 21 to the reference voltage Vref, and when the voltage of the resistor 21 exceeds the reference voltage Vref, the comparator 22 outputs a first comparison signal to control the trigger 23 to trigger switching of the sub-light emitting circuit 10 that supplies power to the display unit 3. It should be understood that the comparator 22 is configured to detect the voltage across the ground resistor 21 at one end of the display unit 3, and then compare the voltage with the reference voltage Vref, and when the voltage across the ground resistor 21 exceeds the reference voltage Vref, it indicates that the current passing through the display unit 3 exceeds the threshold value, at which time the comparator 22 outputs a first comparison signal to control the trigger 23 to trigger switching of the sub-light emitting circuit 10 that supplies power to the display unit 3; when the voltage of the resistor 21 to ground is not higher than the reference voltage Vref, it indicates that the current passing through the display unit 3 does not exceed the threshold value, and at this time, the comparator 22 outputs a second comparison signal, and the trigger 23 does not trigger to switch the sub-light emitting circuit 10 that supplies power to the display unit 3; it is understood that the first comparison signal is a high level signal and the second comparison signal is a low level signal.
In the above example, specifically, the resistance R of the ground resistor 21 does not change, and as known from the formula voltage u=current i×resistance R, when the voltage of the ground resistor 21 connected to one end of the display unit 3 increases, I is indicated to be in an increasing state, that is, the current passing through the light emitting unit is in an increasing state; by comparing the voltage of the ground resistor 21 with the reference voltage Vref, when the voltage of the ground resistor 21 exceeds the reference voltage Vref, it is indicated that the current through the display unit 3 exceeds the threshold value, and at this time, the control circuit 2 switches the electronic light-emitting circuit 10 that supplies power to the display unit 3;
in some examples of the present embodiment, as shown in fig. 4, the flip-flop 23 includes at least two output terminals 230, the output terminals 230 of the flip-flop 23 are connected to the sub-light emitting circuits 10 in a one-to-one correspondence, and the flip-flop 23 outputs a control signal through one output terminal 230; when the current through the display unit 3 exceeds a threshold value, the flip-flop 23 switches the input terminal outputting the control signal to switch the sub-light emitting circuit 10 that supplies power to the display unit 3. As shown in fig. 4, the trigger 23 includes a signal input terminal T, a clock pulse input terminal, and at least two output terminals 230, each output terminal 230 is connected to one sub-light emitting circuit 10, and at the same time, there is and only one output terminal 230 outputting a control signal, the signal input terminal T of the trigger 23 is connected to the working voltage Vd, the clock pulse input terminal of the trigger 23 is connected to the output terminal 230 of the comparator 22, when the trigger 23 receives the working voltage Vd, the trigger 23 outputs the working voltage Vd connected to the signal input terminal T as a control signal through any one of the output terminals 230, and when the trigger 23 receives the first comparison signal sent by the comparator 22, the trigger 23 is switched to the other output terminal 230 to output the connected working voltage Vd as a control signal.
In the above example, as shown in fig. 5, specifically, the trigger 23 is a T trigger 23, a signal input terminal T of the T trigger 23 is connected to the working voltage Vd, a clock signal terminal of the T trigger 23 is connected to an output terminal 230 of the comparator 22, and the output terminal 230 of the T trigger 23 includes: the first output end Q and the second output end Q are not, and at the first moment, the T trigger 23 outputs the working voltage Vd accessed by the signal input end T as a control signal through the first output end Q so as to conduct the sub-light-emitting circuit 10 connected with the first Q to supply power to the display unit 3; at the second moment, when the T flip-flop 23 receives the first comparison signal transmitted by the comparator 22, the T flip-flop 23 triggers switching to the second output terminal Q not to output the working voltage Vd accessed by the signal input terminal T as a control signal through the second output terminal Q, so as to conduct the sub-light emitting circuit 10 with the second output terminal Q not connected to supply power to the display unit 3, thereby realizing switching of the sub-light emitting circuit 10 supplying power to the display unit 3.
In some examples of this embodiment, as shown in fig. 6, a second thin film transistor 12 is disposed on each sub-light emitting circuit 10, a control terminal of the second thin film transistor 12 is connected to the data signal circuit 4, a first terminal of the second thin film transistor 12 is connected to a second terminal of the first thin film transistor 11, and a second terminal of the second thin film transistor 12 is connected to the display unit 3; the second thin film transistor 12 is configured to turn on the sub-light emitting circuit 10 according to the data signal transmitted by the data signal circuit 4, that is, the first thin film transistor 11 is connected to the anode of the display unit 3 through the second thin film transistor 12, where the on direction of the second thin film transistor is from the first direction to the second direction; it should be understood that the present embodiment is not limited to the type of the second thin film transistor 12, and may be flexibly set by a person concerned, and specifically, for example, the second thin film transistor 12 may be a P-type thin film transistor, or the second thin film transistor 12 may be an N-type thin film transistor.
In some examples of the present embodiment, as shown in fig. 6, the data signal circuit 4 is provided with a third thin film transistor 41, and a control terminal of the third thin film transistor 41 is connected to a Scan signal Scan, so as to turn on or off the data signal circuit 4 according to the Scan signal Scan, which is understood that the present embodiment is not limited to the type of the third thin film transistor 41, and may be flexibly set by a relevant person, for example, the third thin film transistor 41 may be a P-type thin film transistor, or the third thin film transistor 41 may be an N-type thin film transistor.
The pixel driving circuit 5 provided in the present embodiment includes: a light-emitting circuit 1 and a control circuit 2, wherein the light-emitting circuit 1 comprises at least two sub light-emitting circuits 10, and the light-emitting circuit 1 is connected with the display unit 3 and is used for supplying power to the display unit 3 through any sub light-emitting circuit 10; the control circuit 2 is connected with the light-emitting circuit 1 and the display unit 3 respectively; the control circuit 2 is configured to detect a current passing through the display unit 3 when the light emitting circuit 1 supplies power to the display unit 3 through any one of the sub light emitting circuits 10; when the current through the display unit 3 exceeds a threshold value, the control circuit 2 switches the sub-light-emitting circuit 10 that supplies power to the display unit 3; when a certain sub-light-emitting circuit 10 drives the display unit 3 and the threshold voltage of the sub-light-emitting circuit 10 changes, the sub-light-emitting circuit 10 supplying power to the display unit 3 is switched when the current passing through the display unit 3 exceeds the threshold value, so that the other sub-light-emitting circuit 10 supplies power to the display unit 3 and supplies stable current not exceeding the threshold value to the display unit 3, and the problem that the power supply to the display unit 3 continuously causes adverse effects to the display unit 3 through the sub-light-emitting circuit 10 with fluctuation of the threshold voltage when the fluctuation of the threshold voltage occurs is avoided.
Example two
For better understanding of the present invention, this embodiment provides a more specific example for explaining the present invention, and as shown in fig. 7, this embodiment provides a pixel driving circuit 5, which includes, but is not limited to: a light-emitting circuit 1 and a control circuit 2, wherein the light-emitting circuit 1 comprises two sub light-emitting circuits 10, and the light-emitting circuit 1 is connected with the display unit 3 and is used for supplying power to the display unit 3 through any one of the sub light-emitting circuits 10; the control circuit 2 is connected with the light-emitting circuit 1 and the display unit 3 respectively; the control circuit 2 is configured to detect a current passing through the display unit 3 when the light emitting circuit 1 supplies power to the display unit 3 through any one of the sub light emitting circuits 10; when the current through the display unit 3 exceeds a threshold value, the control circuit 2 switches the sub-light emitting circuit 10 that supplies power to the display unit 3, and the control circuit 2 is connected to the anode of the display unit 3 to detect the current through the display unit 3.
Wherein, a first thin film transistor 11 is disposed on each sub-light emitting circuit 10, and a control end of the first thin film transistor 11 is connected with the control circuit 2, and is used for switching on or off the sub-light emitting circuits 10 according to a control signal transmitted by the control circuit 2 so as to switch the sub-light emitting circuits 10 for supplying power to the display unit 3;
the control end of the second thin film transistor 12 is connected to the data signal circuit 4, so as to turn on the sub-light emitting circuit 10 according to the data signal transmitted by the data signal circuit 4, the data signal circuit 4 is provided with a third thin film transistor 41, and the control end of the third thin film transistor 41 is connected to a Scan signal Scan, so as to turn on or off the data signal circuit 4 according to the Scan signal Scan.
It should be appreciated that in some examples, each data signal circuit 4 is further connected in parallel with a storage capacitor C, one end of which is connected to the data signal circuit 4, and the other end of which is connected to the cathode of the display unit 3.
As shown in fig. 8, the control circuit 2 includes: the input end of the comparator 22 is respectively connected with the ground resistor 21 and the reference voltage Vref, the signal input end T of the T trigger 23 is connected with the working voltage Vd, the clock signal end of the T trigger 23 is connected with the output end 230 of the comparator 22, and the T trigger 23 comprises: the first output terminal Q and the second output terminal Q are not connected to one sub-light emitting circuit 10, respectively.
When any one of the sub-light emitting circuits 10 drives the display unit 3 for a long time, the sub-light emitting circuit 10 has a problem that the temperature of the first transistor increases, resulting in a decrease in the threshold voltage of the first transistor, an increase in the leakage current, and finally an increase in the current passing through the display unit 3; when the control circuit 2 detects an increase in current, the detected voltage is compared with the reference voltage Vref, and the voltage detected by the control circuit 2 increases due to the increase in current detected by the ground resistor 21. When the voltage detected by the comparator 22 exceeds the reference voltage Vref, the comparator 22 outputs a high level signal as a first comparison signal, the T flip-flop 23 is input, the T flip-flop 23T is connected to the operating voltage Vd, and the operating voltage Vd is a high level voltage, so that the T flip-flop 23 outputs a high level signal all the time, and when the clock signal terminal receives a high level pulse (first comparison signal), the T flip-flop 23 triggers the output terminal 230 of the switching output terminal 230 to output a signal to switch the sub-light emitting circuit 10 to which the display unit 3 is driven. The working principle of the T trigger 23 is as follows: when t=1, the output changes state once every time a high level is received.
So that the two sub-lighting circuits 10 will exchange states whenever the control point bank receives a large current. Since it is generated by one trigger 23, the time to switch states between the two sub-driving point banks is extremely short. The driving is exchanged in this way, so that the display unit 3 is ensured to be always in a normal operating state. Specifically, at the first moment, the T flip-flop 23 outputs the working voltage Vd accessed by the signal input terminal T as a control signal through the first output terminal Q, so as to conduct the sub-light emitting circuit 10 connected to the first output terminal Q to supply power to the display unit 3; at the second moment, when the T flip-flop 23 receives the first comparison signal transmitted by the comparator 22, the T flip-flop 23 triggers switching to the second output terminal Q not to output the working voltage Vd accessed by the signal input terminal T as a control signal through the second output terminal Q, so as to conduct the sub-light emitting circuit 10 with the second output terminal Q not connected to supply power to the display unit 3, thereby realizing switching of the sub-light emitting circuit 10 supplying power to the display unit 3.
Example III
An embodiment of the present application provides a pixel driving method, which is applied to the pixel driving circuit described in any one of the above, as shown in fig. 9, and includes:
s101, detecting current passing through a display unit through a control circuit;
s102, when the current passing through the display unit exceeds a threshold value, switching a light-emitting circuit for supplying power to the display unit through the control circuit.
It will be appreciated that the above pixel driving method is applied to a pixel driving circuit as claimed in any one of the preceding claims, the pixel driving circuit comprising: the display device comprises a display unit, a light emitting circuit and a control circuit, wherein the light emitting circuit comprises at least two sub light emitting circuits, and the light emitting circuit is connected with the display unit and is used for supplying power to the display unit through any one of the sub light emitting circuits; the control circuit is respectively connected with the light-emitting circuit and the display unit; the control circuit is used for detecting the current passing through the display unit when the light-emitting circuit supplies power to the display unit through any one of the sub light-emitting circuits; when the current passing through the display unit exceeds a threshold value, the control circuit switches the sub-light-emitting circuit for supplying power to the display unit; when a certain sub-light-emitting circuit drives the display unit and the threshold voltage of the sub-light-emitting circuit changes, and the current passing through the display unit exceeds the threshold value, the sub-light-emitting circuit supplying power to the display unit is switched, so that the other sub-light-emitting circuit supplies power to the display unit and provides stable current which does not exceed the threshold value for the display unit, the problem that when the threshold voltage fluctuates, the sub-light-emitting circuit continuously supplies power to the display unit through the fluctuation of the threshold voltage and the adverse effect is continuously caused to the display unit is avoided.
Example IV
An embodiment of the present application provides a display panel, as shown in fig. 10, including: a substrate 6, on which substrate 6 a plurality of sub-pixels 7 are provided, each sub-pixel 7 comprising a display unit 3 and a pixel drive circuit 5 as claimed in any one of the preceding claims, the pixel drive circuit 5 being connected to the display unit 3.
In some examples of the present application, the display unit 3 includes a red light display unit 3, a green light display unit 3, and a blue light display unit 3; or, the display unit 3 includes a red light display unit 3, a green light display unit 3, a blue light display unit 3, and a yellow light display unit 3; or, the display unit 3 includes a red light display unit 3, a green light display unit 3, a blue light display unit 3, and a white light display unit 3; the types of the display unit 3 include, but are not limited to: an OLED display unit 3.
Example five
As shown in fig. 11, the embodiment of the present application provides a display device including a processor 111, a communication interface 112, a memory 113, and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 perform communication with each other through the communication bus 114,
a memory 113 for storing a computer program;
in one embodiment of the present application, the processor 111 is configured to implement the steps of the pixel driving method provided in any one of the foregoing method embodiments when executing the program stored in the memory 113.
The present application also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the pixel driving method provided by any one of the method embodiments described above.
It should be noted that in this document, relational terms such as "first" and "second" and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A pixel driving circuit, the pixel driving circuit comprising: the display device comprises a light-emitting circuit and a control circuit, wherein the light-emitting circuit comprises at least two sub light-emitting circuits, and the light-emitting circuit is connected with a display unit and is used for supplying power to the display unit through any sub light-emitting circuit; the control circuit is respectively connected with the light-emitting circuit and the display unit;
the control circuit is used for detecting the current passing through the display unit when the light-emitting circuit supplies power to the display unit through any one of the sub light-emitting circuits; when the current passing through the display unit exceeds a threshold value, the control circuit switches the sub-light-emitting circuit for supplying power to the display unit;
the control circuit includes: the input end of the comparator is connected with the ground resistor and the reference voltage end respectively, the input end of the trigger is connected with the output end of the comparator, and the output end of the trigger is connected with the light-emitting circuit;
the comparator is used for comparing the voltage of the grounding resistor with the reference voltage, and when the voltage of the grounding resistor exceeds the reference voltage, the comparator outputs a first comparison signal to control the trigger to trigger the switching of the sub-lighting circuit for supplying power to the display unit.
2. The pixel driving circuit according to claim 1, wherein a first thin film transistor is disposed on each of the sub-light emitting circuits, and a control terminal of the first thin film transistor is connected to the control circuit, and is configured to turn on or off the sub-light emitting circuit according to a control signal transmitted from the control circuit, so as to switch the sub-light emitting circuit for supplying power to the display unit.
3. The pixel driving circuit according to claim 1, wherein the flip-flop includes at least two output terminals, the output terminals of the flip-flop are connected in one-to-one correspondence with the sub-light emitting circuits, and the flip-flop outputs the control signal through one output terminal;
when the current passing through the display unit exceeds a threshold value, the trigger switches an input end outputting the control signal so as to switch the sub-light-emitting circuit for supplying power to the display unit.
4. The pixel driving circuit according to claim 2, wherein each of the sub-light emitting circuits is further provided with a second thin film transistor, the second thin film transistor is controlled to access the data signal circuit, a first end of the second thin film transistor is connected to a second end of the first thin film transistor, and a second end of the second thin film transistor is connected to the display unit; the second thin film transistor is used for conducting the sub-light-emitting circuit according to the data signal transmitted by the data signal circuit.
5. The pixel driving circuit according to claim 4, wherein a third thin film transistor is disposed on the data signal circuit, and a control terminal of the third thin film transistor is connected to a scan signal, so as to turn on or off the data signal circuit according to the scan signal.
6. A pixel driving circuit according to any one of claims 1 to 5, wherein the control circuit is connected to an anode of the display element to detect a current through the display element.
7. A pixel driving method, wherein the pixel driving method is applied to the pixel driving circuit according to any one of claims 1 to 6, the pixel driving method comprising:
detecting the current passing through the display unit by a control circuit;
when the current passing through the display unit exceeds a threshold value, switching a light emitting circuit for supplying power to the display unit through the control circuit, wherein the control circuit comprises: the input end of the comparator is connected with the ground resistor and the reference voltage end respectively, the input end of the trigger is connected with the output end of the comparator, and the output end of the trigger is connected with the light-emitting circuit; the comparator is used for comparing the voltage of the grounding resistor with the reference voltage, and when the voltage of the grounding resistor exceeds the reference voltage, the comparator outputs a first comparison signal to control the trigger to trigger the switching of the sub-lighting circuit for supplying power to the display unit.
8. A display panel, the display panel comprising: a substrate on which a plurality of sub-pixels are provided, at least one of the sub-pixels comprising a display unit and a pixel driving circuit as claimed in any one of claims 1 to 6, the display unit and the pixel driving circuit being connected.
9. The display panel of claim 8, wherein the display unit comprises: a red light display unit, a green light display unit and a blue light display unit; or alternatively, the first and second heat exchangers may be,
the display unit includes a red light display unit, a green light display unit, a blue light display unit, and a yellow light display unit.
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| CN104021763B (en) * | 2014-06-11 | 2017-12-08 | 合肥鑫晟光电科技有限公司 | The driving method of image element circuit, display device and image element circuit |
| CN106297658B (en) * | 2016-10-28 | 2018-10-23 | 昆山国显光电有限公司 | A kind of current compensation device, method and organic LED display panel |
| CN107492343B (en) * | 2017-08-18 | 2020-06-09 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit for OLED display device and OLED display device |
| CN107886901B (en) * | 2017-12-04 | 2019-10-18 | 合肥鑫晟光电科技有限公司 | Pixel-driving circuit, display panel and its driving method |
| KR102546311B1 (en) * | 2018-09-27 | 2023-06-23 | 엘지디스플레이 주식회사 | Current Sensing Device And Organic Light Emitting Display Device Including The Same |
| CN109166517B (en) * | 2018-09-28 | 2020-06-09 | 京东方科技集团股份有限公司 | Pixel compensation circuit, compensation method thereof, pixel circuit and display panel |
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