CN109272940B - Pixel driving circuit, driving method thereof and display substrate - Google Patents
Pixel driving circuit, driving method thereof and display substrate Download PDFInfo
- Publication number
- CN109272940B CN109272940B CN201811361482.8A CN201811361482A CN109272940B CN 109272940 B CN109272940 B CN 109272940B CN 201811361482 A CN201811361482 A CN 201811361482A CN 109272940 B CN109272940 B CN 109272940B
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- driving
- voltage
- sub
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3266—Details of drivers for scan electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a pixel driving circuit, a driving method thereof and a display substrate, and belongs to the technical field of display. The pixel driving circuit includes a signal generating sub-circuit, a data writing sub-circuit, and a comparing sub-circuit. Since the comparison sub-circuit can output the drive signals of different duty ratios to the gate of the drive transistor by comparing the voltage of the reference signal to which the signal generation sub-circuit outputs and the voltage of the data signal to which the data writing sub-circuit outputs. Therefore, the driving transistor can output the driving current to the light-emitting unit under the control of the driving signal to drive the light-emitting unit to emit light; and the voltage of the data signal can be adjusted, so that the comparison sub-circuit outputs driving signals with different duty ratios to the driving transistor, the working time of the driving transistor is adjusted, and the linear adjustment of the luminous brightness of the luminous unit is further realized. The pixel driving circuit has richer adjustment modes and higher flexibility for the brightness of the light emitting unit.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving circuit, a driving method thereof and a display substrate.
Background
With the development of display technology, organic light emitting diodes (O L ED), which are current type light emitting devices, are increasingly used in high performance display panels due to their characteristics of self-luminescence, fast response, and wide viewing angle, in O L ED display panels, each pixel unit generally includes an O L ED device and a pixel driving circuit for driving the O L ED device.
In the related art, a pixel driving circuit may generally include a switching transistor, a driving transistor, and a capacitor, that is, the pixel driving circuit may have a 2T1C structure, where the switching transistor may write a data signal into a gate of the driving transistor, and the driving transistor may output a driving current to an O L ED device under the driving of the data signal, so as to drive the O L ED device to emit light, and the magnitude of the driving current may be adjusted by adjusting the voltage magnitude of the data signal, so as to adjust the light emitting brightness of the O L ED device.
However, the related art only adjusts the light emitting brightness of the O L ED device by adjusting the voltage of the data signal.
Disclosure of Invention
The invention provides a pixel driving circuit, a driving method thereof and a display substrate, which can solve the problem that the adjustment mode is single when the light emitting brightness of an O L ED device is adjusted in the related art, and the technical scheme is as follows:
in one aspect, a pixel driving circuit is provided, the circuit including: a signal generating sub-circuit, a data writing sub-circuit, a comparing sub-circuit and a driving transistor;
the signal generating sub-circuit is connected with the comparison sub-circuit, the signal generating sub-circuit is used for outputting a reference signal to the comparison sub-circuit, the jump duration of the voltage of the reference signal when jumping between the maximum value and the minimum value is greater than a duration threshold, and the duration threshold is greater than 0;
the data writing sub-circuit is respectively connected with a data signal terminal, a scanning signal terminal and the comparison sub-circuit, and the data writing sub-circuit is used for responding to a scanning signal provided by the scanning signal terminal and outputting a data signal from the data signal terminal to the comparison sub-circuit;
the comparison sub-circuit is further connected with a first power supply end, a voltage modulation signal end and the gate of the driving transistor respectively, and is used for comparing the voltage of the reference signal with the voltage of the data signal in response to a first power supply signal provided by the first power supply end and a modulation signal provided by the voltage modulation signal end, and outputting driving signals with different duty ratios to the gate of the driving transistor according to different comparison results;
the first pole of the driving transistor is connected with a second power supply end, the second pole of the driving transistor is connected with a light-emitting unit, and the driving transistor is used for responding to a second power supply signal provided by the second power supply end and the driving signal and driving the light-emitting unit to emit light.
Optionally, the comparison sub-circuit is further configured to adjust a voltage of the driving signal according to a voltage of the modulation signal.
Optionally, the signal generating sub-circuit includes: a triangular wave generator;
the output end of the triangular wave generator is connected with the comparison sub-circuit, and the reference signal is a triangular wave signal.
Optionally, the data writing sub-circuit includes: a switching transistor and a capacitor;
the grid electrode of the switch transistor is connected with the scanning signal end, the first pole of the switch transistor is connected with the data signal end, and the second pole of the switch transistor is connected with the comparison sub-circuit;
one end of the capacitor is connected with the comparison sub-circuit, and the other end of the capacitor is connected with a third power supply end.
Optionally, the comparison sub-circuit includes: a first comparator;
the positive phase input end of the first comparator is connected with the signal generating sub-circuit, the negative phase input end of the first comparator is connected with the data writing sub-circuit, the output end of the first comparator is connected with the grid electrode of the driving transistor, the first end of the first comparator is connected with the first power supply end, and the second end of the first comparator is connected with the voltage modulation signal end.
Optionally, the circuit further includes: a regulator sub-circuit;
the regulating sub-circuit is respectively connected with the voltage modulation signal end and the comparison sub-circuit, and is used for regulating the voltage of the modulation signal provided by the voltage modulation signal end and outputting the regulated modulation signal to the comparison sub-circuit.
Optionally, the adjusting sub-circuit includes: the digital-to-analog converter, the second comparator, the first resistor and the second resistor;
the output end of the digital-to-analog converter is connected with the positive phase input end of the second comparator;
one end of the first resistor is connected with a third power supply end, and the other end of the first resistor is connected with the inverted input end of the second comparator;
one end of the second resistor is connected with the inverting input end of the second comparator, and the other end of the second resistor is connected with the output end of the second comparator;
and the output end of the second comparator is connected with the voltage modulation signal end.
In another aspect, there is provided a driving method of a pixel driving circuit, applied to the pixel driving circuit according to the above aspect, the method including:
the signal generating sub-circuit outputs a reference signal to the comparison sub-circuit, the potential of a scanning signal provided by a scanning signal end is an effective potential, the data writing sub-circuit responds to the scanning signal and outputs a data signal from a data signal end to the comparison sub-circuit, the jump duration of the voltage of the reference signal when jumping between the maximum value and the minimum value is larger than a duration threshold, and the duration threshold is larger than 0;
the first power supply end provides a first power supply signal, the voltage modulation signal end provides a modulation signal, and the comparison sub-circuit responds to the first power supply signal and the modulation signal, compares the voltage of the reference signal with the voltage of the data signal, and outputs driving signals with different duty ratios to the grid electrode of the driving transistor according to different comparison results;
the second power supply terminal provides a second power signal, and the driving transistor drives the light emitting unit to emit light in response to the second power signal and the driving signal.
In yet another aspect, a display substrate is provided, the display substrate including: a plurality of pixel cells, each of the pixel cells comprising: the pixel driving circuit and the light emitting unit connected with the pixel driving circuit are described in the above aspects.
Optionally, the display substrate includes a plurality of pixels, and each of the pixels includes: a plurality of adjacent pixel units;
the plurality of pixel driving circuits included in each of the pixels are connected to the same data signal terminal.
The technical scheme provided by the invention has the beneficial effects that at least:
in summary, embodiments of the present invention provide a pixel driving circuit, a driving method thereof, and a display substrate. The pixel driving circuit may include a signal generation sub-circuit, a data writing sub-circuit, and a comparison sub-circuit. Since the comparison sub-circuit can output the drive signals of different duty ratios to the gate of the drive transistor by comparing the voltage of the reference signal to which the signal generation sub-circuit outputs and the voltage of the data signal to which the data writing sub-circuit outputs. Therefore, the driving transistor can be controlled by the driving signal to output a driving current to the light-emitting unit so as to drive the light-emitting unit to emit light; and the voltage of the data signal can be adjusted, so that the comparison sub-circuit outputs driving signals with different duty ratios to the driving transistor, the working time of the driving transistor is adjusted, and the linear adjustment of the luminous brightness of the luminous unit is further realized. The pixel driving circuit has richer adjustment modes and higher flexibility for the brightness of the light emitting unit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a graph illustrating a variation of a drain current of a transistor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a pixel driving circuit according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 7 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a pixel driving circuit comparing a voltage of a reference signal with a voltage of a data signal to obtain driving signals with different duty ratios according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The transistors used in all embodiments of the present invention may be thin film transistors or field effect transistors or other devices having the same characteristics, and the transistors used in the embodiments of the present invention are mainly switching transistors and driving transistors according to the role in the circuit. Since the source and the drain of the transistor used herein are symmetrical, the source and the drain can be interchanged. In the embodiment of the present invention, the source is referred to as a first pole, and the drain is referred to as a second pole. The form of the figure provides that the middle end of the transistor is a grid, the signal input end is a source, and the signal output end is a drain. In addition, the transistors used in the embodiments of the present invention may include any one of a P-type transistor that is turned on when the gate is at a low level and turned off when the gate is at a high level, and an N-type transistor that is turned on when the gate is at a high level and turned off when the gate is at a low level.
Fig. 1 is a graph illustrating a variation of a drain current of a transistor according to an embodiment of the present invention. The horizontal axis represents the source-drain voltage Vds (i.e., the voltage difference between the source and the drain) of the transistor, and the vertical axis represents the drain current Id of the transistor. Fig. 1 shows a graph in which the drain current Id varies with the source-drain voltage Vds when the difference between the gate-source voltage Vgs and the threshold voltage Vth of the transistor is 1V, 2V, 3V, 4V, 5V, 6V, and 7V, respectively. Referring to fig. 1, it can be seen that when the source-drain voltage Vds of the transistor is large to a certain extent, the transistor may enter a saturation region, i.e., reach a saturation state. In saturation, the drain current Id of the transistor is related only to the gate-source voltage Vgs (i.e. the difference in gate and source voltages). That is, when the gate-source voltage Vgs is constant, the drain current Id of the transistor does not change. Accordingly, when the source voltage Vs and the drain voltage Vd of the transistor are both fixed, the drain current Id of the transistor (i.e., the driving current output to the light emitting unit) can be controlled to be constant by controlling the gate voltage Vg of the transistor to be constant, so that the light emitting unit is driven to emit light by constant current, i.e., by outputting a constant driving current to the light emitting unit. And the driving current output to the light-emitting unit can be adjusted by adjusting the gate voltage Vg of the transistor, so that the light-emitting brightness of the light-emitting unit is adjusted.
However, in the related art, the light emitting brightness of the light emitting unit can be adjusted only by adjusting the driving current output to the light emitting unit (i.e., adjusting the gate voltage Vg of the driving transistor), so the method is simple. In addition, since the drain current Id of the transistor and the gate-source voltage Vgs have a non-linear relationship, the related art cannot realize linear adjustment of the light-emitting brightness of the light-emitting unit, and further cannot ensure that the light-emitting brightness of each light-emitting unit in the display substrate is the same, so that the uniformity of the brightness of the display device cannot be ensured, and the adjustment effect is poor.
The embodiment of the invention provides a pixel driving circuit, which not only can realize constant current driving of a light emitting unit, but also can realize linear regulation of the luminance of the light emitting unit, and ensures the luminance uniformity of a display device. As shown in fig. 2, the circuit may include: a signal generation sub-circuit 10, a data writing sub-circuit 20, a comparison sub-circuit 30, and a driving transistor T0.
Referring to fig. 2, the signal generation sub-circuit 10 may be connected to a comparison sub-circuit 30. The signal generating sub-circuit 10 may output a reference signal to the comparing sub-circuit 30.
And the jumping duration of the voltage of the reference signal jumping between the maximum value and the minimum value is greater than a duration threshold, and the duration threshold is greater than 0. For example, the reference signal may be a triangular wave signal, a sine wave signal, or a trapezoidal wave signal, which is not limited in the embodiment of the present invention. And the frequency of the reference signal may be the same as the refresh frequency of the display device.
The data write sub-circuit 20 may be connected to the data signal terminal D0, the scan signal terminal S0, and the comparison sub-circuit 30, respectively. The data write sub-circuit 20 may output the data signal from the data signal terminal D0 to the comparison sub-circuit 30 in response to the scan signal supplied from the scan signal terminal S0.
For example, the data write sub-circuit 20 may output the data signal from the data signal terminal D0 to the comparison sub-circuit 30 when the potential of the scan signal supplied from the scan signal terminal S0 is an active potential.
The comparison sub-circuit 30 may be further connected to the first power source terminal V1, the voltage modulation signal terminal VPWM, and the gate of the driving transistor T0, respectively. The comparison sub-circuit 30 may compare the voltage of the reference signal and the voltage of the data signal in response to the first power supply signal supplied from the first power supply terminal V1 and the modulation signal supplied from the voltage modulation signal terminal VPWM. And may output driving signals of different duty ratios to the gate of the driving transistor T0 according to different comparison results.
In the embodiment of the present invention, the duty ratio may refer to a ratio of a duration of the driving signal in which the potential is the effective potential to the entire pulse period in one pulse period. Because the transition duration of the voltage of the reference signal when the voltage transitions between the maximum value and the minimum value is greater than the duration threshold, and the duration threshold is greater than 0, by adjusting the voltage of the data signal, the comparison sub-circuit 30 can obtain different comparison results, and further, the comparison sub-circuit 30 can output driving signals with different duty ratios to the gate of the driving transistor T0. Optionally, a digital-to-analog converter (DAC) may be provided to adjust the voltage of the data signal.
For example, the comparison sub-circuit 30 may compare the voltage of the received reference signal and the voltage of the data signal when the first power supply terminal V1 provides the first power supply signal and the voltage modulation signal terminal VPWM provides the modulation signal. And may output driving signals of different duty ratios to the gate of the driving transistor T0 according to different comparison results.
The first pole of the driving transistor T0 may be connected to the second power source terminal V2, and the second pole of the driving transistor T0 may be connected to the light emitting unit L0 the driving transistor T0 may drive the light emitting unit L0 to emit light in response to the second power source signal and the driving signal supplied from the second power source terminal V2.
For example, the driving transistor T0 may drive the light emitting unit L0 to emit light under the control of the second power signal and the driving signal when the potential of the driving signal is the active potential.
In the embodiment of the present invention, by outputting the driving signals with different duty ratios to the gate of the driving transistor T0, the driving transistor T0 can not only output the driving current to the light emitting unit L0 under the control of the driving signal to control the light emitting unit L0 to emit light, i.e., to realize the constant current driving of the light emitting unit L0, but also because the driving transistor T0 can operate when the potential of the driving signal is the active potential and stop operating when the potential of the driving signal is the inactive potential, the adjustment of the operating time of the driving transistor T0 can be realized by outputting the driving signals with different duty ratios, thereby realizing the linear adjustment of the light emitting brightness of the light emitting unit L0.
In summary, the embodiments of the present invention provide a pixel driving circuit. The pixel driving circuit may include a signal generation sub-circuit, a data writing sub-circuit, and a comparison sub-circuit. Since the comparison sub-circuit can output the drive signals of different duty ratios to the gate of the drive transistor by comparing the voltage of the reference signal to which the signal generation sub-circuit outputs and the voltage of the data signal to which the data writing sub-circuit outputs. Therefore, the driving transistor can be controlled by the driving signal to output a driving current to the light-emitting unit so as to drive the light-emitting unit to emit light; and the voltage of the data signal can be adjusted, so that the comparison sub-circuit outputs driving signals with different duty ratios to the driving transistor, the working time of the driving transistor is adjusted, and the linear adjustment of the luminous brightness of the luminous unit can be realized. The pixel driving circuit has richer adjustment modes of the luminous brightness of the luminous unit and higher flexibility.
In the embodiment of the present invention, the comparison sub-circuit 30 may further adjust the voltage of the driving signal according to the voltage of the modulation signal, that is, the comparison sub-circuit 30 may further adjust the voltage of the driving signal by adjusting the voltage of the modulation signal, and the voltage of the driving signal is positively correlated with the voltage of the modulation signal, that is, the voltage of the driving signal is larger as the voltage of the modulation signal is larger, by adjusting the voltage of the driving signal, the adjustment of the driving current output from the driving transistor T0 to the light emitting unit L0 may be realized, so as to adjust the light emitting brightness of the light emitting unit L0.
Compared with the prior art in which the light emitting brightness of the light emitting unit L can be adjusted only by adjusting the driving current output to the light emitting unit L0, the pixel driving circuit provided by the embodiment of the invention can adjust the light emitting brightness of the light emitting unit L by outputting the driving signals with different duty ratios to the gate of the driving transistor T0 and also can adjust the light emitting brightness of the light emitting unit L by adjusting the driving current output to the light emitting unit L by adjusting the driving transistor T0.
Fig. 3 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention. As shown in fig. 3, the signal generation sub-circuit 10 may include: a triangular wave generator Tr 0.
The output OUT of the triangular wave generator Tr0 may be connected to the comparison sub-circuit 30. For example, the output terminal OUT of the triangular wave generator Tr0 may be connected to the non-inverting input terminal of the comparison sub-circuit 30. Accordingly, the reference signal output by the signal generation sub-circuit 10 to the comparison sub-circuit 30 may be a triangular wave signal.
Since the slope of the triangular wave signal is fixed, by outputting the triangular wave signal as a reference signal to the comparison sub-circuit 30, it is possible to facilitate the comparison sub-circuit 30 to determine the duty ratio of the drive signal from the voltage of the triangular wave signal and the voltage of the data signal.
Alternatively, the reference signal may be a sine wave signal. Accordingly, the signal generating sub-circuit 10 may be a sine wave signal generator, which is not limited in the embodiment of the present invention.
Alternatively, referring to fig. 3, the data writing sub-circuit 20 may include a switching transistor M0 and a capacitor C.
The gate of the switching transistor M0 may be connected to the scan signal terminal S0, the first pole of the switching transistor M0 may be connected to the data signal terminal D0, and the second pole of the switching transistor M0 may be connected to the comparison sub-circuit 30. For example, the second pole of the switching transistor M0 may be connected to the negative phase input of the comparison sub-circuit 30.
One end of the capacitor C may be connected to the comparison sub-circuit 30 (e.g., the negative phase input terminal of the comparison sub-circuit 30), and the other end of the capacitor C may be connected to the third power supply terminal. For example, referring to fig. 3, the third power terminal may be a ground terminal GND. The capacitor C may be used to store a data signal.
Alternatively, referring to fig. 3, the comparison sub-circuit 30 may include: the first comparator a 1.
The non-inverting input terminal of the first comparator a1 may be connected to the signal generating sub-circuit 10, the inverting input terminal of the first comparator a1 may be connected to the data writing sub-circuit 20, and the output terminal of the first comparator a1 may be connected to the gate of the driving transistor T0.
According to the basic principle of the comparator, when the voltage of the positive phase input end of the comparator is greater than that of the negative phase input end, the output end of the comparator can output high level; when the voltage of the non-inverting input terminal of the comparator is less than the voltage of the inverting input terminal, the output terminal of the comparator may output a low level. Therefore, when the voltage of the reference signal is greater than the voltage of the data signal, the first comparator a1 may output a high level; when the voltage of the reference signal is less than the voltage of the data signal, the first comparator a1 may output a low level. And because the transition duration of the voltage of the reference signal when the voltage is transitioned between the maximum value and the minimum value is greater than the duration threshold, and the duration threshold is greater than 0, when the voltage of the data signal changes, the first comparator a1 can obtain different comparison results, and then the first comparator a1 can output driving signals with different duty ratios.
Alternatively, the non-inverting input terminal of the first comparator a1 may be connected to the data writing sub-circuit 20, and the inverting input terminal of the first comparator a1 may be connected to the signal generating sub-circuit 10. At this time, the first comparator a1 may output a low level when the voltage of the reference signal is greater than the voltage of the data signal, and the first comparator a1 may output a high level when the voltage of the reference signal is less than the voltage of the data signal.
Alternatively, referring to fig. 3 and 4, the first terminal D1 of the first comparator a1 may be connected to the first power source terminal V1, and the second terminal D2 of the first comparator a1 may be connected to the voltage modulation signal terminal VPWM.
In the embodiment of the present invention, when the driving transistor T0 is a P-type transistor, referring to fig. 3, the second power source terminal V2 connected to the first electrode of the driving transistor T0 may be the high-level power source terminal VDD. Since the comparison sub-circuit 30 adjusts the voltage of the driving signal (i.e., the gate voltage Vg of the driving transistor T0) according to the modulation signal provided by the voltage modulation signal terminal VPWM. Therefore, in order to ensure that the driving transistor T0 can be turned on at a low level, the voltage modulation signal terminal VPWM to which the second terminal D2 of the first comparator a1 is connected may be a negative power terminal, and the first power terminal V1 to which the first terminal D1 of the first comparator a1 is connected may be a positive power terminal. For example, the first power source terminal V1 and the second power source terminal V2 to which the first electrode of the driving transistor T0 is connected may be the same power source terminal, i.e., the first power source terminal V1 may be a high-level power source terminal VDD. Or the voltage of the first power source terminal V1 may be greater than the voltage of the high-level power source terminal VDD.
Alternatively, the driving transistor T0 may be an N-type transistor, and referring to fig. 4, the second power source terminal V2 connected to the first electrode of the driving transistor T0 may be a low-level power source terminal VSS. In order to ensure that the driving transistor T0 can be turned on at a high level, the voltage modulation signal terminal VPWM to which the second terminal D2 of the first comparator a1 is connected may be a positive power terminal, and the first power terminal V1 to which the first terminal D1 of the first comparator a1 is connected may be a negative power terminal. For example, the first power supply terminal V1 and the second power supply terminal V2 connected to the first electrode of the driving transistor T0 may be the same power supply terminal, i.e., the first power supply terminal V1 may be a low-level power supply terminal VSS. Or the voltage of the first power source terminal V1 may be lower than the voltage of the low-level power source terminal VSS.
In addition, when the driving transistor T0 is a P-type transistor, referring to fig. 3, the second pole of the driving transistor T0 may be connected to one end of the light emitting unit L0 (e.g., the anode of the light emitting unit L0), and the other end of the light emitting unit L0 (e.g., the cathode of the light emitting unit L0) may be connected to the low-level power source terminal VSS, referring to fig. 4, when the driving transistor T0 is an N-type transistor, the second pole of the driving transistor T0 may be connected to one end of the light emitting unit L0 (e.g., the cathode of the light emitting unit L0), and the other end of the light emitting unit L0 (e.g., the anode of the light emitting unit L0) may be connected to the high-level power source terminal VDD.
Fig. 5 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the invention. As shown in fig. 5, the circuit may further include: the regulating sub-circuit 40.
The adjusting sub-circuit 40 may be connected to the voltage modulation signal terminal VPWM and the comparing sub-circuit 30, respectively. The adjusting sub-circuit 40 can adjust the voltage of the modulation signal provided by the voltage modulation signal terminal VPWM, and output the adjusted modulation signal to the comparing sub-circuit 30.
Alternatively, the adjusting sub-circuit 40 may include only a DAC, and the DAC may adjust the voltage of the modulation signal provided by the voltage modulation signal terminal VPWM. Alternatively, as shown in fig. 6, the adjusting sub-circuit 40 may include: a DAC, a second comparator a2, a first resistor R1 and a second resistor R2.
The output of the DAC may be connected to the non-inverting input of a second comparator a 2.
One terminal of the first resistor R1 may be connected to a third power supply terminal. For example, the third power terminal may be a ground terminal GND. The other end of the first resistor R1 may be connected to the inverting input of the second comparator a 2.
One end of the second resistor R2 may be connected to the inverting input terminal of the second comparator a2, and the other end of the second resistor R2 may be connected to the output terminal of the second comparator a 2.
The output of the second comparator a2 may be connected to the voltage modulation signal terminal VPWM.
The second comparator A2, the first resistor R1 and the second resistor R2 are arranged to amplify the voltage output by the DAC and then provide the amplified voltage to the comparison sub-circuit 30, so that the voltage of the modulation signal can be increased on the premise of adjusting the voltage of the modulation signal, and the light emitting brightness of the light emitting unit L0 can be increased.
Alternatively, as can also be seen with reference to fig. 6, the data signal terminal D0 may also be connected to the DAC. The DAC may adjust the signal voltage of the data provided by the data signal terminal D0.
In summary, the embodiments of the present invention provide a pixel driving circuit. The pixel driving circuit may include a signal generation sub-circuit, a data writing sub-circuit, and a comparison sub-circuit. Since the comparison sub-circuit can output the drive signals of different duty ratios to the gate of the drive transistor by comparing the voltage of the reference signal to which the signal generation sub-circuit outputs and the voltage of the data signal to which the data writing sub-circuit outputs. Therefore, the driving transistor can be controlled by the driving signal to output a driving current to the light-emitting unit so as to drive the light-emitting unit to emit light; and the voltage of the data signal can be adjusted, so that the comparison sub-circuit outputs driving signals with different duty ratios to the driving transistor, the working time of the driving transistor is adjusted, and the linear adjustment of the luminous brightness of the luminous unit can be realized. The pixel driving circuit has richer adjustment modes of the luminous brightness of the luminous unit and higher flexibility.
Fig. 7 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the present invention, which can be applied to the pixel driving circuit shown in any one of fig. 2 to 6. As shown in fig. 7, the method may include:
in step 701, the signal generating sub-circuit outputs a reference signal to the comparing sub-circuit, the potential of the scanning signal provided by the scanning signal terminal is an effective potential, and the data writing sub-circuit outputs a data signal from the data signal terminal to the comparing sub-circuit in response to the scanning signal.
In the embodiment of the present invention, a transition duration when the voltage of the reference signal transitions between the maximum value and the minimum value is greater than a duration threshold, and the duration threshold is greater than 0. For example, the reference signal may be a triangular wave signal, a sine wave signal, or a trapezoidal wave signal, which is not limited in the embodiment of the present invention. And the frequency of the reference signal may be the same as the refresh frequency of the display device.
In step 702, the first power source terminal provides a first power source signal, and the voltage modulation signal terminal provides a modulation signal. The comparison sub-circuit responds to the first power supply signal and the modulation signal, compares the voltage of the reference signal with the voltage of the data signal, and outputs driving signals with different duty ratios to the grid electrode of the driving transistor according to different comparison results.
In step 703, the second power source terminal provides a second power signal, and the driving transistor drives the light emitting unit to emit light in response to the second power signal and the driving signal.
Optionally, the sequence of the steps of the driving method of the pixel driving circuit provided in the embodiment of the present invention may be appropriately adjusted, and the steps may also be increased or decreased according to the situation. For example, the steps 701 to 703 may be performed synchronously. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure is covered by the protection scope of the present disclosure, and thus, the detailed description thereof is omitted.
In summary, the embodiments of the present invention provide a driving method of a pixel driving circuit. The comparison sub-circuit can output the driving signals with different duty ratios to the gate of the driving transistor by comparing the voltage of the reference signal output thereto by the comparison signal generation sub-circuit and the voltage of the data signal output thereto by the data writing sub-circuit under the control of the first power supply signal provided by the first power supply signal terminal and the modulation signal provided by the voltage modulation signal terminal. Therefore, the driving transistor can be controlled by the driving signal to output a driving current to the light-emitting unit so as to drive the light-emitting unit to emit light; and the voltage of the data signal can be adjusted, so that the comparison sub-circuit outputs driving signals with different duty ratios to the driving transistor, the working time of the driving transistor is adjusted, and the light emitting brightness of the light emitting unit can be adjusted. The pixel driving circuit has richer adjustment modes of the luminous brightness of the luminous unit and higher flexibility.
Taking the pixel driving circuit shown in fig. 3 as an example, and taking the switching transistor M0 and the driving transistor T0 in the pixel driving circuit as P-type transistors as an example, the driving principle of the pixel driving circuit provided by the embodiment of the invention is described in detail. As can be seen with reference to fig. 3, the signal generating sub-circuit 10 may include a triangle wave generator Tr 0. Accordingly, the reference signal output from the signal generating sub-circuit 10 to the comparing sub-circuit 30 may be a triangular wave signal. Since the switch transistor M0 is a P-type transistor, when the potential of the scan signal provided by the scan signal terminal S0 is low, the switch transistor M0 is turned on, and the data signal terminal D0 can output the data signal to the negative input terminal of the first comparator a1 through the switch transistor M0.
Fig. 8 is a schematic diagram of a pixel driving circuit comparing a voltage of a reference signal with a voltage of a data signal to obtain driving signals with different duty ratios according to an embodiment of the present invention, since the signal generating sub-circuit 10 is connected to a positive input terminal of the first comparator a1, and the data writing sub-circuit 20 is connected to a negative input terminal of the first comparator a1, referring to fig. 8, it can be seen that, in a stage T1, a voltage Vref of the reference signal is greater than a voltage Vdata of the data signal, accordingly, a voltage of the driving signal (i.e., a gate voltage Vg output to the driving transistor T0) is a high voltage, the driving transistor T0 is in an off state, in a stage T2, a voltage Vref of the reference signal is less than the voltage Vdata of the data signal, accordingly, a voltage of the driving signal (i.e., a gate voltage Vg output to the driving transistor T0) is a low voltage, the driving transistor T0 is in an on state, and at this time, the driving transistor T0 can output a driving current 4830 to the light emitting unit L under driving of the second power source terminal V2.
For example, referring to fig. 8, when the voltage Vdata of the data signal decreases, the duration that the voltage Vdata of the data signal is less than the voltage Vref of the reference signal increases due to the constant timing of the reference signal, and accordingly, the duration that the voltage Vg of the driving signal is high increases, that is, the duty ratio of the driving signal increases.
Optionally, in the embodiment of the present invention, a DAC may be provided to adjust the voltage Vdata of the data signal. The period of the reference signal may be the same as the period of a Vertical Synchronization (VSYNC) refresh, i.e., may be equal to the period of the frame synchronization signal. At this time, the voltage values of the voltage Vdata of the data signal in different periods can be adjusted, so that the comparison sub-circuit 30 can output the driving signals with different duty ratios to the gate of the driving transistor T0 in the display stages of different frames, thereby making the display luminance of each frame different. That is, the DAC may refresh the voltage Vdata of the data signal once every one frame time, so that the display luminance of each frame is different.
Or the period of the reference signal may be the same as the period of a Horizontal Synchronization (HSYNC) refresh, i.e., may be equal to the period of the row synchronization signal. At this time, the voltage values of the voltage Vdata of the data signal in different periods can be adjusted, so that the comparison sub-circuit 30 can output driving signals with different duty ratios to the gate of the driving transistor T0 in the display phases of different rows, and further, the light emitting brightness of each row of the light emitting units is different. That is, the DAC may refresh the voltage Vdata of the data signal once every display time of one row, so that the light emitting luminance of each row of the light emitting cells is different.
Since the embodiment of the invention adjusts the brightness of the light emitting unit L0 by outputting the driving signals with different duty ratios to the gate of the driving transistor T0, compared with the related art that adjusts the brightness of the light emitting unit L0 by adjusting the driving current output to the light emitting unit L0, the color depth of the display substrate can be made deeper and finer, and the method for debugging the duty ratio is simpler.
In summary, the embodiments of the present invention provide a driving method of a pixel driving circuit. The comparison sub-circuit can output the driving signals with different duty ratios to the gate of the driving transistor by comparing the voltage of the reference signal output thereto by the comparison signal generation sub-circuit and the voltage of the data signal output thereto by the data writing sub-circuit under the control of the first power supply signal provided by the first power supply signal terminal and the modulation signal provided by the voltage modulation signal terminal. Therefore, the driving transistor can be controlled by the driving signal to output a driving current to the light-emitting unit to drive the light-emitting unit to emit light; and the voltage of the data signal can be adjusted, so that the comparison sub-circuit outputs driving signals with different duty ratios to the driving transistor, the working time of the driving transistor is adjusted, and the light emitting brightness of the light emitting unit can be adjusted. The pixel driving circuit has richer adjustment modes of the luminous brightness of the luminous unit and higher flexibility.
An embodiment of the present invention provides a display substrate, which may include: a plurality of pixel units. Each pixel unit may include a pixel driving circuit as shown in any one of fig. 2 to 6, and a light emitting unit connected to the pixel driving circuit.
Optionally, in an embodiment of the present invention, the display substrate may include a plurality of pixels, and each pixel may include: a plurality of adjacent pixel cells. The plurality of pixel driving circuits included in each pixel may be connected to the same data signal terminal.
When each pixel unit in the display substrate is a white pixel unit emitting white light, and a color film is arranged in the display substrate, a plurality of pixel units included in each pixel need to work synchronously.
Since the pixel driving circuit provided by the embodiment of the invention adjusts the light emitting brightness of the light emitting unit by outputting the driving signals with different duty ratios to the gate of the driving transistor, when a plurality of pixel units included in each pixel work synchronously, the same data signal terminal can be used for providing data signals for a plurality of pixel single driving circuits included in each pixel. That is, a plurality of pixel driving circuits included in each pixel may be connected to the same data signal terminal.
Since the related art adjusts the light emitting luminance of the light emitting unit by adjusting the driving current output to the light emitting unit (i.e., adjusting the voltage of the data signal provided from the data signal terminal), each of the plurality of pixel driving circuits included in each pixel needs to be connected to a data signal terminal, respectively, even if the plurality of pixel units included in each pixel operate in synchronization. Therefore, compared with the display substrate in the related art, the display substrate provided by the embodiment of the invention has the advantages of less number of data signal ends, lower cost and simpler structure.
For example, when each pixel includes three adjacent pixel units (for example, the three pixel units may be a red pixel unit, a green pixel unit, and a blue pixel unit), three pixel driving circuits included in the three pixel units may be connected to one data signal terminal. Compared with the related art in which the three pixel driving circuits need to be connected with three data signal terminals, the display substrate provided by the embodiment of the invention only needs to be provided with one third of the data signal terminals in the related art.
The display device can be any product or component with a display function, such as a Micro L ED display device, a liquid crystal panel, electronic paper, an O L ED panel, an AMO L ED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame and the like.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the pixel driving circuit, the display substrate and the display device described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A pixel driving circuit, comprising: a signal generating sub-circuit, a data writing sub-circuit, a comparing sub-circuit and a driving transistor;
the signal generating sub-circuit is connected with the comparison sub-circuit, the signal generating sub-circuit is used for outputting a reference signal to the comparison sub-circuit, the jump duration of the voltage of the reference signal when jumping between the maximum value and the minimum value is greater than a duration threshold, and the duration threshold is greater than 0;
the data writing sub-circuit is respectively connected with a data signal terminal, a scanning signal terminal and the comparison sub-circuit, and the data writing sub-circuit is used for responding to a scanning signal provided by the scanning signal terminal and outputting a data signal from the data signal terminal to the comparison sub-circuit;
the comparison sub-circuit is further connected to a first power supply terminal, a voltage modulation signal terminal, and a gate of the driving transistor, respectively, and is configured to compare a voltage of the reference signal with a voltage of the data signal in response to a first power supply signal provided from the first power supply terminal and a modulation signal provided from the voltage modulation signal terminal, and output driving signals of different duty ratios to the gate of the driving transistor according to different comparison results, and is further configured to adjust the voltage of the driving signal according to the voltage of the modulation signal, and the voltage of the driving signal is positively correlated with the voltage of the modulation signal; if the driving transistor is a P-type transistor, the first power supply end is a positive power supply end, the voltage modulation signal end is a negative power supply end, and if the driving transistor is an N-type transistor, the first power supply end is a negative power supply end, and the voltage modulation signal end is a positive power supply end;
the first pole of the driving transistor is connected with a second power supply end, the second pole of the driving transistor is connected with a light-emitting unit, and the driving transistor is used for responding to a second power supply signal provided by the second power supply end and the driving signal and driving the light-emitting unit to emit light;
wherein the comparison sub-circuit comprises: a first comparator, a positive phase input terminal of which is connected to the signal generating sub-circuit, an inverse phase input terminal of which is connected to the data writing sub-circuit, an output terminal of which is connected to the gate of the driving transistor, a first terminal of which is connected to the first power supply terminal, and a second terminal of which is connected to the voltage modulation signal terminal;
the circuit further comprises: a regulator sub-circuit; the regulating sub-circuit is respectively connected with the voltage modulation signal end and the comparison sub-circuit, and is used for regulating the voltage of the modulation signal provided by the voltage modulation signal end and outputting the regulated modulation signal to the comparison sub-circuit.
2. The circuit of claim 1, wherein the signal generation subcircuit comprises: a triangular wave generator;
the output end of the triangular wave generator is connected with the comparison sub-circuit, and the reference signal is a triangular wave signal.
3. The circuit of claim 1, wherein the data write subcircuit comprises: a switching transistor and a capacitor;
the grid electrode of the switch transistor is connected with the scanning signal end, the first pole of the switch transistor is connected with the data signal end, and the second pole of the switch transistor is connected with the comparison sub-circuit;
one end of the capacitor is connected with the comparison sub-circuit, and the other end of the capacitor is connected with a third power supply end.
4. The circuit of any of claims 1 to 3, wherein the conditioning sub-circuit comprises: the digital-to-analog converter, the second comparator, the first resistor and the second resistor;
the output end of the digital-to-analog converter is connected with the positive phase input end of the second comparator;
one end of the first resistor is connected with a third power supply end, and the other end of the first resistor is connected with the inverted input end of the second comparator;
one end of the second resistor is connected with the inverting input end of the second comparator, and the other end of the second resistor is connected with the output end of the second comparator;
and the output end of the second comparator is connected with the voltage modulation signal end.
5. A driving method of a pixel driving circuit, applied to the pixel driving circuit according to any one of claims 1 to 4, the method comprising:
the signal generating sub-circuit outputs a reference signal to the comparison sub-circuit, the potential of a scanning signal provided by a scanning signal end is an effective potential, the data writing sub-circuit responds to the scanning signal and outputs a data signal from a data signal end to the comparison sub-circuit, the jump duration of the voltage of the reference signal when jumping between the maximum value and the minimum value is larger than a duration threshold, and the duration threshold is larger than 0;
the first power supply end provides a first power supply signal, the voltage modulation signal end provides a modulation signal, and the comparison sub-circuit responds to the first power supply signal and the modulation signal, compares the voltage of the reference signal with the voltage of the data signal, and outputs driving signals with different duty ratios to the grid electrode of the driving transistor according to different comparison results;
the second power supply terminal provides a second power signal, and the driving transistor drives the light emitting unit to emit light in response to the second power signal and the driving signal.
6. The method of claim 5, wherein the period of the reference signal is the same as the period of a frame synchronization signal, or the period of the reference signal is the same as the period of a line synchronization signal.
7. A display substrate, comprising: a plurality of pixel cells, each of the pixel cells comprising: a pixel driving circuit as claimed in any one of claims 1 to 4, and a light emitting unit connected to the pixel driving circuit.
8. The display substrate of claim 7, wherein the display substrate comprises a plurality of pixels, each of the pixels comprising: a plurality of adjacent pixel units;
the plurality of pixel driving circuits included in each of the pixels are connected to the same data signal terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811361482.8A CN109272940B (en) | 2018-11-15 | 2018-11-15 | Pixel driving circuit, driving method thereof and display substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811361482.8A CN109272940B (en) | 2018-11-15 | 2018-11-15 | Pixel driving circuit, driving method thereof and display substrate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109272940A CN109272940A (en) | 2019-01-25 |
| CN109272940B true CN109272940B (en) | 2020-08-07 |
Family
ID=65190178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811361482.8A Active CN109272940B (en) | 2018-11-15 | 2018-11-15 | Pixel driving circuit, driving method thereof and display substrate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109272940B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109686335B (en) * | 2019-02-19 | 2021-04-27 | 京东方科技集团股份有限公司 | Time sequence control method, time sequence controller and display device |
| CN112136174B (en) * | 2019-04-09 | 2023-07-21 | 京东方科技集团股份有限公司 | Driving device of display panel, driving method of driving device and display device |
| CN109872686B (en) * | 2019-04-19 | 2020-05-29 | 京东方科技集团股份有限公司 | Drive circuit, display panel and manufacturing method of display panel |
| CN110136642B (en) * | 2019-05-30 | 2021-02-02 | 上海天马微电子有限公司 | Pixel circuit, driving method thereof and display panel |
| CN110111727A (en) * | 2019-06-03 | 2019-08-09 | 京东方科技集团股份有限公司 | A kind of pixel-driving circuit and its driving method, display device |
| CN110148376B (en) | 2019-06-04 | 2020-11-06 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, display panel and display device |
| CN111583857B (en) * | 2020-05-29 | 2021-04-30 | 厦门天马微电子有限公司 | Pixel driving circuit, driving method thereof and display panel |
| CN111640405B (en) * | 2020-06-30 | 2022-06-28 | 京东方科技集团股份有限公司 | Liquid crystal module driving control method and device and liquid crystal display |
| CN114093301B (en) | 2020-07-31 | 2023-04-11 | 京东方科技集团股份有限公司 | Display device, pixel driving circuit and driving method thereof |
| CN113053319A (en) * | 2021-03-19 | 2021-06-29 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN113674680B (en) * | 2021-08-20 | 2023-03-14 | 南京大学 | PWM (pulse-Width modulation) driving circuit and driving method based on pixel sharing |
| CN113674681A (en) * | 2021-08-20 | 2021-11-19 | 南京大学 | NMOS transistor-based PWM pixel circuit, driving method and display device |
| CN114333704A (en) * | 2021-12-31 | 2022-04-12 | 厦门天马微电子有限公司 | Pixel driving circuit, driving method thereof and display panel |
| CN114446224B (en) * | 2022-02-15 | 2023-04-14 | 上海天马微电子有限公司 | Pixel structure, display panel and display device |
| CN114566124B (en) * | 2022-04-28 | 2022-07-12 | 惠科股份有限公司 | Light emitting unit driving circuit, display panel and display device |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2367413A (en) * | 2000-09-28 | 2002-04-03 | Seiko Epson Corp | Organic electroluminescent display device |
| CN100409290C (en) * | 2001-12-14 | 2008-08-06 | 三洋电机株式会社 | Digitally driven type display device |
| JP3854161B2 (en) * | 2002-01-31 | 2006-12-06 | 株式会社日立製作所 | Display device |
| JP5298284B2 (en) * | 2007-11-30 | 2013-09-25 | 株式会社ジャパンディスプレイ | Image display device and driving method thereof |
| KR101451744B1 (en) * | 2011-10-12 | 2014-10-16 | 엘지디스플레이 주식회사 | Organic Light Emitting Diode Display Device |
| JP2015004945A (en) * | 2013-02-04 | 2015-01-08 | ソニー株式会社 | Display device, drive method thereof and control pulse generation device |
| CN203242306U (en) * | 2013-04-22 | 2013-10-16 | 福建华映显示科技有限公司 | Over-temperature protection circuit and organic light-emitting diode pixel circuit with over-temperature protection |
| CN104318900B (en) * | 2014-11-18 | 2016-08-24 | 京东方科技集团股份有限公司 | A kind of organic electroluminescence display device and method of manufacturing same and method |
| CN104464644A (en) * | 2015-01-05 | 2015-03-25 | 京东方科技集团股份有限公司 | Pixel structure, display panel and display device |
| TW201706978A (en) * | 2015-08-04 | 2017-02-16 | 啟耀光電股份有限公司 | Display panel and pixel circuit |
| CN106782319B (en) * | 2016-12-27 | 2023-10-24 | 京东方科技集团股份有限公司 | Pixel circuit, pixel driving method and display device |
-
2018
- 2018-11-15 CN CN201811361482.8A patent/CN109272940B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109272940A (en) | 2019-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109272940B (en) | Pixel driving circuit, driving method thereof and display substrate | |
| US11270630B2 (en) | Driving circuit, driving method thereof and display apparatus | |
| US10978002B2 (en) | Pixel circuit and driving method thereof, and display panel | |
| US20210097931A1 (en) | Pixel driving circuit, pixel driving method, display panel and display device | |
| US11620942B2 (en) | Pixel circuit, driving method thereof and display device | |
| CN110176213B (en) | Pixel circuit, driving method thereof and display panel | |
| CN107610651B (en) | Pixel circuit, driving method of pixel circuit and display panel | |
| CN109872686B (en) | Drive circuit, display panel and manufacturing method of display panel | |
| KR102469801B1 (en) | Method of setting driving voltages to reduce power consumption in organic light emitting display device | |
| CN112102785A (en) | Pixel circuit, display panel, driving method of display panel and display device | |
| US11551606B2 (en) | LED driving circuit, display panel, and pixel driving device | |
| CN111145686B (en) | Pixel driving circuit, display panel and driving method | |
| US11367393B2 (en) | Display panel, driving method thereof and display device | |
| CN213277408U (en) | Pixel circuit, display panel and display device | |
| US11562693B2 (en) | Display devices, pixel driving circuits and methods of driving the same | |
| US11620939B2 (en) | Pixel driving circuit and driving method therefor, display panel, and display apparatus | |
| CN110164375B (en) | Pixel compensation circuit, driving method, electroluminescent display panel and display device | |
| CN113851082B (en) | Pixel driving circuit, driving method thereof and display panel | |
| WO2021184192A1 (en) | Pixel circuit and driving method therefor, and display apparatus | |
| US11605344B2 (en) | Pixel circuit, display panel and driving method thereof, and display device | |
| CN113903307B (en) | Signal providing method, signal providing module and display device | |
| CN114783353A (en) | Mu LED unit light-emitting circuit, light-emitting control method thereof and display device | |
| CN109147673B (en) | Pixel circuit, driving method thereof and display device | |
| CN114187872A (en) | Display panel driving method and display device | |
| WO2022095044A1 (en) | Display panel and driving method therefor, and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |