CN114944134A - Pixel driving circuit, method and display panel - Google Patents
Pixel driving circuit, method and display panel Download PDFInfo
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- CN114944134A CN114944134A CN202210506674.3A CN202210506674A CN114944134A CN 114944134 A CN114944134 A CN 114944134A CN 202210506674 A CN202210506674 A CN 202210506674A CN 114944134 A CN114944134 A CN 114944134A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000010409 thin film Substances 0.000 claims description 70
- 239000000758 substrate Substances 0.000 claims description 6
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- 238000010586 diagram Methods 0.000 description 11
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- 238000001514 detection method Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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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]
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Abstract
The application relates to a pixel driving circuit, a method and a display panel, wherein the pixel driving circuit drives a display unit at a certain sub-luminous circuit, and the threshold voltage of the sub-luminous circuit changes, so that when the current passing through the display unit exceeds the threshold value, the sub-luminous circuit for supplying power to the display unit is switched, so that the other sub-luminous circuit supplies power to the display unit, the stable current not exceeding the threshold value is provided for the display unit, the problem that when the threshold voltage fluctuates, the sub-luminous circuit with the fluctuating threshold voltage continuously supplies power to the display unit, and the problem that the adverse effect is continuously caused to the display unit is avoided.
Description
Technical Field
The present disclosure relates to the field of display panel technologies, and in particular, to a pixel driving circuit, a pixel driving method, and a display panel.
Background
With the development of the related technologies, the display technology is developed from a Liquid Crystal Display (LCD) to a Light Emitting Diode (LED), and in the development from an LED to an organic light-Emitting Diode (OLED), the OLED display device has the characteristics of self-luminescence, simple structure, ultra-light and thinness, fast response speed, wide viewing angle, low power consumption, and capability of realizing flexible display, and is therefore widely applied in the display field.
In the related art, the OLED generally performs current driving control on the OLED by a light emitting circuit, and when a Thin Film Transistor (TFT) on the light emitting circuit works for a long time or works in other environments, characteristics of the TFT change, so that a threshold voltage changes, a leakage current changes, and a current transmitted by a driving current fluctuates, thereby causing adverse effects on the OLED; therefore, how to reduce the current fluctuation passing through the OLED and further reduce the adverse effect on the OLED is a problem that needs to be solved.
Disclosure of Invention
The application provides a pixel driving circuit, a pixel driving method and a display device panel, which aim to solve the problem that in the related art, the current passing through a display unit is increased to cause adverse effects on the display unit.
In a first aspect, the present application provides a 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 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; the control circuit switches the sub light emitting circuit that supplies power to the display unit when a current passing through the display unit exceeds a threshold value.
Optionally, each of the sub light emitting circuits is provided with a first thin film transistor, and a control end 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 by the control circuit, so as to switch the sub light emitting circuit that supplies power to the display unit.
Optionally, the control circuit comprises: the ground resistor is connected with the display unit, the input end of the comparator is respectively connected with the ground resistor and the reference voltage end, 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 ground resistor with the reference voltage, and when the voltage of the ground resistor exceeds the reference voltage, the comparator outputs a first comparison signal to control the trigger to trigger and switch the sub-light-emitting circuit for supplying power to the display unit.
Optionally, the flip-flop includes at least two output ends, the output ends of the flip-flop are connected to the sub-light emitting circuits in a one-to-one correspondence, and the flip-flop 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 supplying power to the display unit.
Optionally, each of the sub light emitting circuits is provided with a second thin film transistor, a control end of the second thin film transistor is connected to 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.
Optionally, 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 and used for turning on or off the data signal circuit according to the scan 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 described in any one of the above, the pixel driving method comprising: detecting, by a control circuit, a current through a display unit; when the current passing through the display unit exceeds a threshold value, the sub-light emitting circuit supplying power to the display unit is switched by the control circuit.
In a third aspect, a display panel is provided, including: the display device comprises a substrate, wherein a plurality of sub-pixels are arranged on the substrate, at least one sub-pixel comprises a display unit and a pixel driving circuit, and the pixel driving circuit is connected with the display unit.
Optionally, the display unit comprises: the display device comprises a red light display unit, a green light display unit and a blue light display unit; or the display unit comprises 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 by the embodiment of the application comprises: the display unit comprises a light-emitting circuit and a control circuit, wherein the light-emitting circuit comprises at least two sub light-emitting circuits, 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; the control circuit switches the sub light emitting circuit that supplies power to the display unit when a current passing through the display unit exceeds a threshold; when a certain sub-light-emitting circuit drives the display unit and the threshold voltage of the sub-light-emitting circuit changes to cause the current passing through the display unit to exceed the threshold value, the sub-light-emitting circuit for supplying power to the display unit is switched to enable another sub-light-emitting circuit to supply power to the display unit, so that stable current not exceeding the threshold value is provided for the display unit, the problem that when the threshold voltage fluctuates, the sub-light-emitting circuit continuously supplying power to the display unit through the threshold voltage and the display unit is continuously influenced is solved.
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 present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a basic structure of an optional pixel driving circuit according to an embodiment of the present disclosure;
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 an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of an alternative flip-flop according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a further alternative flip-flop according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a sub-lighting circuit according to yet another alternative embodiment of the present disclosure;
fig. 7 is a schematic diagram of a basic structure of an optional 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 disclosure;
fig. 9 is a basic diagram illustrating 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 application;
fig. 11 is a schematic structural diagram of a display device according to a fifth embodiment of the present application;
description of reference numerals:
1-a light emitting circuit; 10-sub light emitting circuit; 11-a first thin film transistor; 12-a second thin film transistor; 2-a control circuit; 21-resistance to ground; 22-a comparator; 23-a flip-flop; 230-an output terminal; 3-a display unit; 4-a data signal circuit; 41-a third thin film transistor; 5-a pixel drive circuit; 6-a substrate; 7-sub-pixel; vd-operating voltage; vdd-supply voltage; vref-reference voltage; a T signal input terminal; c1-clock signal input; q-a first output terminal; q is a second output; Scan-Scan signal; c-a storage capacitor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in 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 obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
Example one
In order to solve the problem in the related art that the current passing through the display unit 3 fluctuates and causes adverse effects on the display unit 3, please refer to fig. 1, where fig. 1 is a pixel driving circuit 5 provided in an embodiment of the present application, where the pixel driving circuit 5 includes but is not limited to: the display device comprises 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 used for supplying power to the display unit 3 through any one of the sub light-emitting circuits 10; the control circuit 2 is respectively connected with the light-emitting circuit 1 and the display unit 3; 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 the sub light emitting circuits 10 included in the light emitting circuit 1, and the number of the sub light emitting circuits 10 may be flexibly set by the relevant person, and preferably, the number of the 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 circuit 1 is connected to the anode of the display unit 3, that is, each of the sub light emitting circuits 10 is 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-lighting circuit 10, for example, A, B are included in the lighting circuit 1, and the display unit 3 is driven to emit light by a or B when the display unit 3 is required to emit light.
In some examples of the present embodiment, the control circuit 2 is connected to an anode of the display unit 3 to detect a current passing through the display unit 3; in some examples, the control circuit 2 may be connected to a cathode of the display unit 3 to detect a 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 a first terminal of the first thin film transistor 11 is connected to the power voltage Vdd, a 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, current is transmitted to the anode of the display unit 3.
It is understood that if the first thin film transistor 11 of the same sub-light emitting circuit 10 continues to operate for a long time, the characteristics of the first thin film transistor 11 change, resulting in an increase in 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 a certain sub-light emitting circuit 10 continuously operates for a long time, which causes the temperature of the first thin film transistor 11 to rise, and further causes the threshold voltage of the first thin film transistor 11 to become small, the leakage current to become large, and further causes the current transmitted by the sub-light emitting circuit 10 to increase, the current passing through the display unit 3 is in an unstable state, so that the display of the display unit 3 is unstable, and the display effect is affected, and meanwhile, the service life of the display unit 3 is affected by the increase of the current passing through the display unit 3; at this time, the control circuit 2 detects the current passing through the display unit 3, when the current passing through the display unit 3 exceeds a threshold, the control circuit 2 switches the sub-light emitting circuits 10 that supply 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 circuit 10 is necessarily in a normal state (the threshold voltage of the first thin film transistor 11 of the switched sub-light emitting circuit 10 is not changed), so that when the display unit 3 is supplied with power through the switched sub-light emitting circuit 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 will be understood from the above example, the present embodiment does not limit the type of the first thin film transistor 11, when the first thin film transistor 11 is an N-type thin film transistor, the sub-light emitting circuit 10 is turned on when the control circuit 2 transmits a high-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 low-level control signal; 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: a trigger 23, a ground resistor 21, and a comparator 22, wherein the ground resistor 21 is connected to the display unit 3, and an input terminal of the comparator 22 is respectively connected to the ground resistor 21 and a reference voltage terminal, that is, the input terminal of the comparator is connected to a reference voltage Vref, the input terminal of the trigger 23 is connected to an output terminal 230 of the comparator 22, and the output terminal 230 of the trigger 23 is connected to the light emitting circuit 1; the comparator 22 is configured to compare the voltage of the ground resistor 21 with the reference voltage Vref, and when the voltage of the ground 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-lighting circuit 10 that supplies power to the display unit 3. It should be understood that the comparator 22 is configured to detect a voltage across the ground resistor 21 connected to one end of the display unit 3, compare the voltage with a reference voltage Vref, and when the voltage across the ground resistor 21 exceeds the reference voltage Vref, it indicates that the current through the display unit 3 exceeds a threshold, at this 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 ground resistor 21 is not higher than the reference voltage Vref, it indicates that the current passing through the display unit 3 does not exceed the threshold, at this time, the comparator 22 outputs the second comparison signal, and the trigger 23 does not trigger the sub-light emitting circuit 10 for switching the power supply 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.
As described above, specifically, the resistance R of the ground resistor 21 does not change, and according to the formula, the voltage U is the current I × the resistor R, when the voltage of the end of the ground resistor 21 connected to the display unit 3 increases, it indicates that I is in an increased state, that is, the current passing through the light-emitting unit is in an increased state; 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 indicates that the current passing through the display unit 3 exceeds the threshold, and at this time, the control circuit 2 switches the sub light emitting circuit 10 that supplies power to the display unit 3;
in some examples of this 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-lighting 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, 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 flip-flop 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 of the sub-light emitting circuits 10, and at the same time, only one output terminal 230 of the flip-flop 23 outputs a control signal, the signal input terminal T of the flip-flop 23 is connected to a working voltage Vd, the clock pulse input terminal of the flip-flop 23 is connected to the output terminal 230 of the comparator 22, when the flip-flop 23 receives the working voltage Vd, the flip-flop 23 outputs the working voltage Vd connected to the signal input terminal T as the control signal through any one of the output terminals 230, and when the flip-flop 23 receives the first comparison signal sent by the comparator 22, the flip-flop 23 switches to another output terminal 230 to output the connected working voltage Vd as the control signal.
To take the above example, specifically, as shown in fig. 5, the flip-flop 23 is a T-flip-flop 23, a signal input terminal T of the T-flip-flop 23 is connected to the operating voltage Vd, a clock signal terminal of the T-flip-flop 23 is connected to the output terminal 230 of the comparator 22, and the output terminal 230 of the T-flip-flop 23 includes: the first output end Q and the second output end Q are not, and at the first moment, the T-flip-flop 23 outputs the working voltage Vd, which is 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 output end 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 to switch to the second output end qfin, and the working voltage Vd accessed by the signal input end T is output as a control signal through the second output end qfin, so as to turn on the sub-light emitting circuit 10 disconnected by the second output end Q 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 the present embodiment, as shown in fig. 6, a second thin film transistor 12 is disposed on each of the sub light emitting circuits 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 used for turning 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, wherein the turning 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 kind of the second thin film transistor 12, and may be flexibly set by the relevant personnel, 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 this embodiment, as shown in fig. 6, a third thin film transistor 41 is disposed on the data signal circuit 4, and a control terminal of the third thin film transistor 41 is connected to a Scan signal Scan for turning on or off the data signal circuit 4 according to the Scan signal Scan, it 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, and specifically, 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 this embodiment includes: the display device comprises 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 used for supplying power to the display unit 3 through any one of the sub light-emitting circuits 10; the control circuit 2 is respectively connected with the light-emitting circuit 1 and the display unit 3; 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, 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, so that the current passing through the display unit 3 exceeds the threshold value, the sub-light emitting circuit 10 for supplying power to the display unit 3 is switched, so that the other sub-light emitting circuit 10 supplies power to the display unit 3, and the stable current not exceeding the threshold value is provided for the display unit 3, thereby avoiding the problem that when the threshold voltage fluctuates and the certain sub-light emitting circuit 10 supplies power to the display unit 3, the sub-light emitting circuit 10 with the fluctuating threshold voltage continuously supplies power to the display unit 3, and the adverse effect is continuously caused to the display unit 3.
Example two
For better understanding of the present invention, the present embodiment provides a more specific example to illustrate the present invention, and as shown in fig. 7, the present embodiment provides a pixel driving circuit 5, which includes but is not limited to: the display device comprises 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 used for supplying power to the display unit 3 through any one of the sub light-emitting circuits 10; the control circuit 2 is respectively connected with the light-emitting circuit 1 and the display unit 3; 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 passing 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 passing through the display unit 3.
Each of the sub-light emitting circuits 10 is provided with a first thin film transistor 11, and a control end 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;
each of the sub light emitting circuits 10 is provided with a second thin film transistor 12, a control terminal of the second thin film transistor 12 is connected to the data signal circuit 4, and is configured to turn on the sub light emitting circuits 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 a control terminal of the third thin film transistor 41 is connected to the Scan signal Scan, and is configured to turn on or turn off the data signal circuit 4 according to the Scan signal Scan.
It should be understood that, in some examples, each data signal circuit 4 is further connected in parallel with a storage capacitor C, one end of the storage capacitor C is connected to the data signal circuit 4, and the other end of the storage capacitor C is connected to the cathode of the display unit 3.
As shown in fig. 8, the control circuit 2 includes: the display device comprises a T 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 Vref, the signal input end T of the T trigger 23 is connected with a 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 end Q and the second output end Q are not respectively connected with one sub-lighting circuit 10.
When any sub-light emitting circuit 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 is increased, so that the threshold voltage of the first transistor is reduced, the leakage current is increased, and finally the current passing through the display unit 3 is increased; when the control circuit 2 detects the increase of the current, the detected voltage is compared with the reference voltage Vref, and the voltage detected by the control circuit 2 increases due to the detection of the increase of the current to 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 first comparison signal is input to the T flip-flop 23, the T flip-flop 23T is connected to the working voltage Vd, and the working voltage Vd is a high level voltage, so that the output of the T flip-flop 23 is always a high level signal, and when the clock signal end receives a high level pulse (first comparison signal), the T flip-flop 23 triggers the output end 230 of the switching output end 230 to output a signal, so as to switch the sub-lighting circuit 10 that drives the display unit 3. The working principle of the T flip-flop 23 is as follows: when T is 1, the output changes state once every time it receives a high level.
The two sub-lighting circuits 10 will change state alternately as long as the control point bank receives a large current. The time for switching the state between the two sub-driving point banks is extremely short due to the generation by one flip-flop 23. The driving is exchanged in this way, thereby ensuring that the display unit 3 is always in a normal working state. Specifically, at a first time, 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 turn on 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 to switch to the second output end qfin, and the working voltage Vd accessed by the signal input end T is output as a control signal through the second output end qfin, so as to turn on the sub-light emitting circuit 10 disconnected by the second output end Q 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 the method includes:
s101, detecting the current passing through the display unit through a control circuit;
and S102, when the current passing through the display unit exceeds a threshold value, switching the sub-light-emitting circuit for supplying power to the display unit through the control circuit.
It should be understood that the above-described pixel driving method is applied to the pixel driving circuit as described in any one of the above, the pixel driving circuit including: the display unit comprises a light-emitting circuit and a control circuit, wherein the light-emitting circuit comprises at least two sub light-emitting circuits, 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; the control circuit switches the sub light emitting circuit that supplies power to the display unit when a current passing through the display unit exceeds a threshold; when a certain sub-light-emitting circuit drives the display unit and the threshold voltage of the sub-light-emitting circuit changes to cause the current passing through the display unit to exceed the threshold value, the sub-light-emitting circuit for supplying power to the display unit is switched to enable another sub-light-emitting circuit to supply power to the display unit, so that stable current not exceeding the threshold value is provided for the display unit, the problem that when the threshold voltage fluctuates, the sub-light-emitting circuit continuously supplying power to the display unit through the threshold voltage and the display unit is continuously influenced is solved.
Example four
An embodiment of the present application provides a display panel, as shown in fig. 10, the display panel includes: the display device comprises a substrate 6, wherein a plurality of sub-pixels 7 are arranged on the substrate 6, each sub-pixel 7 comprises a display unit 3 and a pixel driving circuit 5, and the pixel driving circuit 5 is connected with the display unit 3.
In some examples of the present application, the display unit 3 includes a red display unit 3, a green display unit 3, and a blue 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 categories of the display unit 3 include, but are not limited to: the OLED display unit 3.
EXAMPLE five
As shown in fig. 11, the embodiment of the present application provides a display device, which includes 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 complete mutual communication through the communication bus 114,
a memory 113 for storing a computer program;
in an 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.
Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the pixel driving method as provided in any of the foregoing method embodiments.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely illustrative of particular embodiments of the invention that 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 (10)
1. A 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, is connected with a 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 sub light-emitting circuit; the control circuit switches the sub light emitting circuit that supplies power to the display unit when a current passing through the display unit exceeds a threshold value.
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, for turning 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.
3. The pixel driving circuit according to claim 1, wherein the control circuit comprises: the display unit comprises a trigger, a ground resistor and a comparator, wherein the ground resistor is connected with the display unit, the input end of the comparator is respectively connected with the ground resistor and a reference voltage end, 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 ground resistor with the reference voltage, and when the voltage of the ground resistor exceeds the reference voltage, the comparator outputs a first comparison signal to control the trigger to trigger and switch the sub-light-emitting circuit for supplying power to the display unit.
4. The pixel driving circuit according to claim 3, wherein the flip-flop comprises at least two output terminals, the output terminals of the flip-flop are connected to the sub-light emitting circuits in a one-to-one correspondence, 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 supplying power to the display unit.
5. The pixel driving circuit according to claim 2, wherein each of the sub-light emitting circuits further includes a second thin film transistor, a control terminal of the second thin film transistor is connected to a data signal circuit, a first terminal of the second thin film transistor is connected to a second terminal of the first thin film transistor, and a second terminal 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.
6. The pixel driving circuit according to claim 5, 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 for turning on or off the data signal circuit according to the scan signal.
7. The pixel driving circuit according to any of claims 1-6, wherein the control circuit is coupled to an anode of the display unit to detect a current through the display unit.
8. A pixel driving method applied to the pixel driving circuit according to any one of claims 1 to 7, the pixel driving method comprising:
detecting, by a control circuit, a current through a display unit;
when the current passing through the display unit exceeds a threshold value, the sub-light emitting circuit supplying power to the display unit is switched by the control circuit.
9. A display panel, comprising: a substrate having a plurality of sub-pixels disposed thereon, at least one of the sub-pixels comprising a display unit and a pixel drive circuit according to any of claims 1-7, the display unit and the pixel drive circuit being connected.
10. The display panel according to claim 9, wherein the display unit comprises: the display device comprises a red light display unit, a green light display unit and a blue light display unit; or the like, or, alternatively,
the display unit comprises 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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| CN114944134B (en) | 2023-06-30 |
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