CN111916027B - Pixel circuit and driving method thereof, display panel and driving method thereof - Google Patents
Pixel circuit and driving method thereof, display panel and driving method thereof Download PDFInfo
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- CN111916027B CN111916027B CN201910386363.6A CN201910386363A CN111916027B CN 111916027 B CN111916027 B CN 111916027B CN 201910386363 A CN201910386363 A CN 201910386363A CN 111916027 B CN111916027 B CN 111916027B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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Abstract
The present disclosure relates to a pixel circuit and a driving method thereof, a display panel and a driving method thereof, the pixel circuit including: the drive sub-circuit, the signal input end, the write-in sub-circuit, the first light-emitting control sub-circuit and the energy storage sub-circuit; the signal input end is used for outputting a data signal and a first power supply signal; the writing sub-circuit is respectively connected with a first scanning signal end, the signal input end and the driving sub-circuit and is used for providing the data signal to the driving sub-circuit under the control of the first scanning signal; the first light-emitting control sub-circuit is respectively connected with the light-emitting control signal end, the signal input end and the driving sub-circuit and is used for providing the first power supply signal for the driving sub-circuit under the driving of the light-emitting control signal; the energy storage sub-circuit is connected with the driving sub-circuit, and the driving sub-circuit writes the data signal into the energy storage sub-circuit in a scanning stage and generates a driving current in a light-emitting stage.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a pixel circuit and a driving method thereof, and a display panel and a driving method thereof.
Background
With the development of OLED (Organic Light Emitting Diode) display technology, the resolution requirement of an OLED display panel is higher and higher, where the resolution refers to the number of pixel units in a unit area, that is, the requirement for the number of pixel units in the unit area is higher and higher.
At present, pixel units in a display panel are usually driven by a pixel circuit to emit light, the pixel circuit often includes a large number of signal lines, the large number of signal lines require a large wiring space, and the area for arranging the pixel units on an array substrate is reduced due to the wiring space, so that the number of the pixel units on the array substrate is limited, and the design and manufacture of the ultra-high resolution display panel are not facilitated.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to a pixel circuit and a driving method thereof, a display panel and a driving method thereof, and thereby at least to some extent, the problem that a large number of signal lines in the related art require a large wiring space, and the area for arranging pixel units on an array substrate is reduced due to the wiring space, so that the number of pixel units on the array substrate is limited is solved.
According to a first aspect of the present disclosure, there is provided a pixel circuit comprising:
a driving sub-circuit;
a signal input terminal for outputting a data signal and a first power signal;
a write-in sub-circuit, respectively connected to the first scan signal terminal, the signal input terminal and the driving sub-circuit, for providing the data signal to the driving sub-circuit under the control of the first scan signal;
the first light-emitting control sub-circuit is respectively connected with the light-emitting control signal end, the signal input end and the driving sub-circuit and is used for providing the first power supply signal for the driving sub-circuit under the driving of the light-emitting control signal;
the energy storage sub-circuit is connected with the driving sub-circuit and is used for storing the signals written by the driving sub-circuit;
the driving sub-circuit writes the data signal into the energy storage sub-circuit in a scanning phase and generates a driving current in a light-emitting phase.
According to an embodiment of the present disclosure, the driving sub-circuit includes:
the first end of the driving transistor is connected with the writing sub-circuit, and the control end of the driving transistor is connected with the energy storage sub-circuit;
the first switch sub-circuit is respectively connected with the first scanning signal end, the second end of the driving transistor and the energy storage sub-circuit and is used for being connected with the control end and the second end of the driving transistor under the control of the first scanning signal;
and the initialization sub-circuit is respectively connected with the initialization control signal terminal, the second terminal of the driving transistor and the reset signal terminal and is used for responding to the initialization control signal to be conducted so as to transmit the reset signal to the control terminal of the driving transistor and the first terminal of the light-emitting element.
According to an embodiment of the present disclosure, the driving sub-circuit further includes:
and the second light-emitting control sub-circuit is respectively connected with the light-emitting control signal end, the second end of the driving transistor and the light-emitting element and is used for transmitting the first power supply signal to the light-emitting element under the control of the light-emitting control signal.
According to an embodiment of the present disclosure, the reset signal is provided by the signal input terminal.
According to an embodiment of the present disclosure, the write sub-circuit includes:
the first end of the first transistor is connected with the signal input end, the second end of the first transistor is connected with the first end of the driving transistor, and the control end of the first transistor is connected with a first scanning signal;
according to an embodiment of the present disclosure, the first light emitting control sub-circuit includes:
and the first end of the second transistor is connected with the signal input end, the second end of the second transistor is connected with the first end of the driving transistor, and the control end of the second transistor is connected with the light-emitting control signal.
According to an embodiment of the present disclosure, the first switch sub-circuit includes:
and the first end of the third transistor is connected with the second end of the driving transistor, the second end of the third transistor is connected with the control end of the driving transistor, and the control end of the third transistor is connected with the first scanning signal.
According to an embodiment of the present disclosure, the initialization sub-circuit includes:
a fifth transistor, wherein the first end is connected to the signal input end, the second end is connected to the control end of the driving transistor, and the control end is connected to the initialization control signal;
and the first end of the sixth transistor is connected with the signal input end, the second end of the sixth transistor is connected with the first end of the light-emitting element, and the control end of the sixth transistor is connected with the initialization control signal.
According to an embodiment of the present disclosure, the second light emission control sub-circuit includes:
and the first end of the fourth transistor is connected with the second end of the driving transistor, the second end of the fourth transistor is connected with the light-emitting element, and the control end of the fourth transistor is connected with the light-emitting control signal.
According to an embodiment of the present disclosure, the initialization control signal is a second scan signal.
According to a second aspect of the present disclosure, there is provided a driving method of a pixel circuit, for the above pixel circuit, the driving method comprising:
providing a first scanning signal to the writing sub-circuit so that the data signal provided by the signal input end is output to the driving sub-circuit;
providing a first scanning signal to the driving sub-circuit to enable a data signal to be written into the energy storage sub-circuit through the driving sub-circuit;
and providing a light-emitting control signal to the first light-emitting control sub-circuit so that the first power supply signal provided by the signal input end is written into the light-emitting element to drive the light-emitting element to emit light.
According to an embodiment of the present disclosure, when the driving sub-circuit includes a driving transistor, a first switching sub-circuit, an initializing sub-circuit, and a second light emitting sub-circuit, the driving method further includes:
providing an initialization control signal to the initialization sub-circuit to cause the reset signal to be transmitted to the energy storage sub-circuit and the light emitting element;
providing a first scanning signal to the writing sub-circuit so that the data signal provided by the signal input end is output to the driving transistor;
providing the first scan signal to the first switch sub-circuit to cause a data signal to be written into a tank sub-circuit;
and supplying a light-emitting control signal to the first light-emitting control sub-circuit and the second light-emitting control sub-circuit so that the first power supply signal supplied by the signal input end is written into the light-emitting element to drive the light-emitting element to emit light.
According to a third aspect of the present disclosure, there is provided a display panel including a plurality of rows of the above pixel circuits.
According to a fourth aspect of the present disclosure, there is provided a driving method of a display panel, for the display panel described above, the driving method of the display panel including:
providing scanning signals to the pixel circuits line by line so that the data signals provided by the signal input end are written into the pixel circuits line by line;
and after all data signals of the pixel circuits in a plurality of rows are written, providing a light-emitting control signal for the pixel circuits so that the first power supply signal provided by the signal input end is written into light-emitting units of the pixel circuits in a plurality of rows.
According to one embodiment of the present disclosure, the plurality of rows of pixel circuits includes a plurality of pixel circuit regions including at least two rows of pixel circuits;
the line-by-line supplying a scanning signal to the pixel circuit so that a data signal supplied from a signal input terminal is written into the pixel circuit line by line, includes:
and simultaneously providing a scanning signal and a data signal to each pixel circuit region, so that the data signals provided by the signal input end in each pixel circuit region are respectively written into the pixel circuits in the pixel circuit region row by row.
According to an embodiment of the present disclosure, the plurality of rows of pixel circuits includes a first pixel circuit region in which scanning is performed line by line in a first direction and a second pixel circuit region in which scanning is performed line by line in a second direction, the first direction and the second direction being opposite.
According to one embodiment of the present disclosure, the plurality of rows of pixel circuits includes a plurality of pixel circuit regions including at least two rows of pixel circuits;
the providing of the light emitting control signal to the pixel circuit to cause the first power supply signal provided by the signal input terminal to be written into a plurality of rows of light emitting cells of the pixel circuit includes:
and providing light-emitting control signals to the pixel circuit regions region by region so as to write the first power supply signal provided by the signal input end into the light-emitting units of the pixel circuit regions region by region.
According to one embodiment of the present disclosure, the plurality of rows of pixel circuits includes a plurality of pixel circuit regions including at least two rows of pixel circuits;
the providing of the light emitting control signal to the pixel circuit to cause the first power supply signal provided by the signal input terminal to be written into a plurality of rows of the pixel circuit light emitting cells includes:
and simultaneously providing the light-emitting control signal to each pixel circuit region so as to write the first power supply signal into the light-emitting units in each pixel circuit region row by row.
According to one embodiment of the present disclosure, the plurality of rows of pixel circuits include a first pixel circuit region and a second pixel circuit region, the pixel circuit regions include at least two rows of pixel circuits, and the driving method of the display panel includes;
providing scanning signals to the pixel circuits of the first pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits of the first pixel circuit area row by row; simultaneously providing a light-emitting control signal to the pixel circuit of the second pixel circuit region so as to enable the first power supply signal provided by the signal input end to be written into the light-emitting unit of the pixel circuit of the second pixel circuit region simultaneously;
providing scanning signals to the pixel circuits in the second pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the second pixel circuit area row by row; and simultaneously providing a light-emitting control signal for the pixel circuit of the first pixel circuit region so as to enable the first power supply signal provided by the signal input end to be written into the light-emitting unit of the pixel circuit of the first pixel circuit region simultaneously.
According to one embodiment of the present disclosure, the plurality of rows of pixel circuits include a first pixel circuit region and a second pixel circuit region, the pixel circuit regions include at least two rows of pixel circuits, and the driving method of the display panel includes;
providing scanning signals to the pixel circuits in the first pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the first pixel circuit area row by row; providing light-emitting control signals to the pixel circuits in the second pixel circuit area row by row so that the first power signals provided by the signal input end are written into the light-emitting units of the pixel circuits in the second pixel circuit area row by row;
providing scanning signals to the pixel circuits of the second pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits of the second pixel circuit area row by row; and providing light-emitting control signals to the pixel circuits of the first pixel circuit area row by row so that the first power signals provided by the signal input end are written into the light-emitting units of the pixel circuits of the first pixel circuit area row by row.
The pixel circuit provided by the disclosure comprises a signal input end, wherein the signal input end outputs a data signal and a power signal, namely the data signal and the power signal are input into the pixel circuit through one signal line, the data signal and the power signal are input through the same signal input end, the number of the signal lines on the array substrate is reduced, the effective area of the array substrate is saved, more pixel units can be arranged on a unit area, and the resolution of the display panel is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic diagram of a first pixel circuit provided in an exemplary embodiment of the present disclosure;
fig. 2 is a schematic diagram of a second pixel circuit provided in an exemplary embodiment of the present disclosure;
fig. 3 is a schematic diagram of a third pixel circuit provided in an exemplary embodiment of the present disclosure;
fig. 4 is a driving timing diagram of a pixel circuit according to an exemplary embodiment of the present disclosure;
fig. 5 is a flowchart of a driving method of a pixel circuit according to an exemplary embodiment of the present disclosure;
fig. 6 is a flowchart of another driving method of a pixel circuit according to an exemplary embodiment of the present disclosure;
fig. 7 is a flowchart of a driving method of a display panel according to an exemplary embodiment of the present disclosure;
fig. 8 is a timing diagram of a scan driving of a display panel according to an exemplary embodiment of the present disclosure;
fig. 9 is a timing diagram of light emission driving of a display panel according to an exemplary embodiment of the present disclosure.
Fig. 10 is a timing diagram of light emission driving of another display panel according to an exemplary embodiment of the present disclosure.
In the figure: 100. a driving sub-circuit; 120. a first switching electronic circuit; 130. initializing a sub-circuit; 140. a second light emission control sub-circuit; 200. a write sub-circuit; 300. a tank sub-circuit; 400. a first light emission control sub-circuit;
t1, a first transistor; t2, a second transistor; t3, a third transistor; t4, a fourth transistor; t5, a fifth transistor; t6, a sixth transistor; cst, storage capacitor.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The exemplary embodiments of the present disclosure first provide a pixel circuit, as shown in fig. 1, the pixel circuit including: a driving sub-circuit 100, a signal input terminal, a writing sub-circuit 200, a first light-emitting control sub-circuit 400, a tank sub-circuit 300, and a light-emitting element; the signal input end is used for outputting a DATA signal DATA and a first power supply signal VDD; the write sub-circuit 200 is respectively connected to a first scanning signal terminal, the signal input terminal and the driving sub-circuit 100, and is configured to provide the DATA signal DATA to the driving sub-circuit 100 under the control of the first scanning signal Gn; the first light-emitting control sub-circuit 400 is respectively connected to a light-emitting control signal terminal, the signal input terminal and the driving sub-circuit 100, and is configured to provide the first power signal VDD to the driving sub-circuit 100 under the driving of the light-emitting control signal EM; the energy storage sub-circuit 300 is connected to the driving sub-circuit 100, the driving sub-circuit 100 writes the DATA signal DATA into the energy storage sub-circuit 300 in a scanning phase, and generates a driving current in a light-emitting phase; the first terminal of the light emitting element is connected to the driving sub-circuit 100, and the second terminal is connected to a second power source VSS.
The pixel circuit provided by the embodiment of the disclosure comprises a signal input end, wherein the signal input end outputs a DATA signal DATA and a power signal, namely, the DATA signal DATA and the power signal are input into the pixel circuit through one signal line, and the DATA signal DATA and the power signal are input through the same signal input end, so that the number of signal lines on an array substrate is reduced, the effective area of the array substrate is saved, more pixel units can be arranged on a unit area, and the resolution of a display panel is improved.
The following describes each sub-circuit of the pixel circuit provided by the embodiments of the present disclosure in detail:
as shown in fig. 2, the driving sub-circuit 100 includes: a driving transistor, a first switching sub-circuit 120, an initialization sub-circuit 130, and a second light emission control sub-circuit 140; the first end of the driving transistor is connected with the writing sub-circuit 200, and the control end is connected with the energy storage sub-circuit 300; the first switch sub-circuit 120 is respectively connected to the first scan signal terminal, the second terminal of the driving transistor, and the energy storage sub-circuit 300, and is configured to be connected to the control terminal and the second terminal of the driving transistor under the control of the first scan signal Gn; the initialization sub-circuit 130 is respectively connected to the initialization control signal terminal, the second terminal of the driving transistor, and the reset signal terminal, and is configured to be turned on in response to the initialization control signal Vi to transmit the reset signal Vint to the control terminal of the driving transistor and the first terminal of the light emitting element; the second emission control sub-circuit 140 is respectively connected to the emission control signal terminal, the second terminal of the driving transistor, and the light emitting element, and is configured to transmit the first power signal VDD to the light emitting element under the control of the emission control signal EM.
Wherein the reset signal Vint is provided by the signal input terminal. That is, the signal input terminal may be configured to provide the DATA signal DATA, the first power signal VDD, and the reset signal Vint, and the number of signal lines may be further reduced by outputting the DATA signal DATA, the first power signal VDD, and the reset signal Vint through the signal input terminal, so that the wiring space is saved, and the resolution of the display device is improved.
As shown in fig. 3, the write sub-circuit 200 includes a first transistor T1, a first terminal of the first transistor T1 is connected to the signal input terminal, a second terminal of the first transistor T1 is connected to the first terminal of the driving transistor, a control terminal of the first transistor T1 is connected to the first scan signal Gn, and the first transistor T1 is turned on to transmit the DATA signal DATA to the first terminal of the driving transistor in response to the first scan signal Gn.
The first light emitting control sub-circuit 400 includes a second transistor T2 having a first terminal connected to the signal input terminal, a second terminal connected to the first terminal of the driving transistor, and a control terminal connected to the light emitting control signal EM, wherein the second transistor T2 is turned on in response to the light emitting control signal EM to transmit the first power signal VDD to the first terminal of the driving transistor.
The first switch sub-circuit 120 includes a third transistor T3, a first terminal of which is connected to the second terminal of the driving transistor, a second terminal of which is connected to the control terminal of the driving transistor, and the control terminal of which is connected to the first scan signal Gn; the third transistor T3 is turned on in response to the first scan signal Gn to transmit a signal from the second terminal of the driving transistor to the control terminal of the driving transistor.
The initialization sub-circuit 130 includes: a fifth transistor T5 and a sixth transistor T6, the fifth transistor T5 has a first terminal connected to the signal input terminal, a second terminal connected to the control terminal of the driving transistor, and the control terminal connected to the initialization control signal Vi; the fifth transistor T5 turns on to transmit the reset signal Vint to the control terminal of the driving transistor in response to the initialization control signal Vi. A first terminal of the sixth transistor T6 is connected to the signal input terminal, a second terminal thereof is connected to the first terminal of the light emitting element, and a control terminal thereof is connected to the initialization control signal Vi; the sixth transistor T6 is turned on in response to the initialization control signal Vi, and transmits the reset signal Vint to the light emitting element.
The second emission control sub-circuit 140 includes a fourth transistor T4, a first terminal of the fourth transistor T4 is connected to the second terminal of the driving transistor, a second terminal of the fourth transistor T4 is connected to the light emitting device, a control terminal of the fourth transistor T3526 is connected to the emission control signal EM, and the fourth transistor T4 is turned on in response to the emission control signal EM to transmit a signal at the second terminal of the driving transistor to the light emitting device.
Optionally, the initialization control signal Vi is the second scan signal Gn-1, that is, the reset signal Vint may be provided by scan signals of adjacent rows, so that the number of signal lines in the display device may be reduced, a wiring space may be saved, and the PPI of the display device may be improved.
Referring to the timing diagram shown in fig. 4, taking the first to sixth transistors T6 as P-type transistors as an example, the storage sub-circuit 300 includes a storage capacitor Cst, wherein a first terminal of the storage capacitor Cst is connected to the second terminal of the third transistor T3, and a second terminal of the storage capacitor Cst is connected to the second scan signal terminal. The light emitting element may be an OLED, and the first end of the light emitting element is an anode and the second end of the light emitting element is a cathode, and the pixel circuit provided by the embodiment of the disclosure operates as follows:
initialization phase t 1: the signal input terminal inputs a reset signal Vint, the initialization control signal Vi is at a low level, the fifth transistor T5 and the sixth transistor T6 are controlled to be turned on, the first scan signal Gn is at a high level, the first transistor T1 is controlled to be turned off, the emission control signal EM is at a high level, the second transistor T2 and the fourth transistor T4 are controlled to be turned off, and the reset signal Vint is written into the storage capacitor Cst and the light emitting element.
Data write phase t 2: the signal input terminal inputs the DATA signal DATA, the initialization control signal Vi is at a high level, the fifth transistor T5 and the sixth transistor T6 are controlled to be turned off, the first scan signal Gn is at a low level, the first transistor T1 is controlled to be turned on, the emission control signal EM is at a high level, the second transistor T2 and the fourth transistor T4 are controlled to be turned off, and the DATA signal DATA is written into the storage capacitor Cst.
Data holding phase t 3: the initialization control signal Vi is at a high level, controlling the fifth transistor T5 and the sixth transistor T6 to turn off, the first scan signal Gn at a high level, controlling the first transistor T1 to turn off, the emission control signal EM at a high level, controlling the second transistor T2 and the fourth transistor T4 to turn off, and the DATA signal DATA is maintained in the storage capacitor Cst.
Lighting phase t 4: the signal input terminal inputs the first power signal VDD, the initialization control signal Vi is at a high level, the fifth transistor T5 and the sixth transistor T6 are controlled to be turned off, the first scan signal Gn is at a high level, the first transistor T1 is controlled to be turned off, the emission control signal EM is at a low level, the second transistor T2 and the fourth transistor T4 are controlled to be turned on, the driving transistor is turned on under the control of the DATA signal DATA in the storage capacitor Cst, the first power signal VDD is transmitted to the light emitting element, and the light emitting element emits light.
It should be noted that: in the above specific embodiment, all transistors are P-type transistors; those skilled in the art will readily appreciate that pixel drive circuits provided in accordance with the present disclosure can be implemented with all transistors being N-type transistors. Of course, the pixel driving circuit provided in the present disclosure may also be replaced by a CMOS (Complementary Metal Oxide Semiconductor) circuit, etc., and is not limited to the pixel driving circuit provided in this embodiment, and will not be described herein again.
The exemplary embodiment of the present disclosure also provides a driving method of a pixel circuit, which is used for the pixel circuit, and as shown in fig. 5, the driving method includes:
step S510 of supplying the first scan signal Gn to the write sub-circuit 200 to output the DATA signal DATA supplied from the signal input terminal to the drive sub-circuit 100;
a step S520 of providing the driving sub-circuit 100 with a first scan signal Gn to write the DATA signal DATA into the energy storage sub-circuit 300 through the driving sub-circuit 100;
in step S530, the light-emitting control signal EM is provided to the first light-emitting control sub-circuit 400, so that the first power signal VDD provided by the signal input terminal is written into the light-emitting element to drive the light-emitting element to emit light.
According to the pixel circuit driving method provided by the embodiment of the disclosure, the DATA signal DATA and the power signal are input into the pixel circuit through one signal line, and the DATA signal DATA and the power signal are input through the same signal input end, so that the number of signal lines on the array substrate is reduced, the effective area of the array substrate is saved, more pixel units can be arranged on a unit area, and the resolution of the display panel is improved.
Further, when the driving sub-circuit 100 includes a driving transistor, a first switching sub-circuit 120, an initialization sub-circuit 130, and a second light emitting sub-circuit, as shown in fig. 6, the driving method includes:
step S610, providing an initialization control signal Vi to the initialization sub-circuit 130, so that the reset signal Vint is transmitted to the energy storage sub-circuit 300 and the light emitting element;
step S620, providing the first scanning signal Gn to the write sub-circuit 200, so that the DATA signal DATA provided by the signal input terminal is output to the driving transistor;
step S630, providing the first scan signal Gn to the first switch sub-circuit 120, so as to write the DATA signal DATA into the tank sub-circuit 300;
in step S640, the light-emitting control signal EM is provided to the first light-emitting control sub-circuit 400 and the second light-emitting control sub-circuit 140, so that the first power signal VDD provided by the signal input terminal is written into the light-emitting element to drive the light-emitting element to emit light.
It should be noted that: the specific details of each step of the driving method of the pixel circuit have been described in detail in the corresponding pixel driving circuit, and therefore are not described herein again.
The exemplary embodiments of the present disclosure also provide a display panel including a plurality of rows of the above-described pixel circuits. The display panel further includes a plurality of signal lines for supplying a DATA signal DATA, a light emission control signal EM, and a reset signal Vint. The display device may include any product or component with a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, and a navigator.
The exemplary embodiments of the present disclosure also provide a driving method of a display panel, which is used for the display panel described above, and as shown in fig. 7, the driving method of the display panel includes:
step S710, providing scanning signals to the pixel circuits row by row, so that the DATA signals DATA provided by the signal input terminals are written into the pixel circuits row by row;
in step S720, after all writing of the DATA signals DATA of the plurality of rows of the pixel circuits is completed, a light-emitting control signal EM is provided to the pixel circuits, so that the first power signal VDD provided by the signal input terminal is written into a plurality of rows of the light-emitting units of the pixel circuits.
According to the driving method of the display panel provided by the embodiment of the disclosure, scanning signals are provided to the pixel circuits row by row, the DATA signals DATA provided by the signal input ends are written into the pixel circuits row by row, and after all the DATA signals DATA of the pixel circuits are written into the pixel circuits row by row, the light-emitting control signal EM is provided to the pixel circuits so that the first power signal VDD provided by the signal input ends is written into the light-emitting units of the pixel circuits row by row, thereby realizing that the DATA signals DATA and the first power signal VDD are provided by the DATA signal DATA ends, reducing the number of signal lines on an array substrate in the display panel, and being beneficial to improving the PPI of the display device.
Since the signal input terminal supplies the DATA signal DATA and the first power supply signal VDD in accordance with the timing, it is necessary to supply the DATA signal DATA first, and after the DATA writing is completed for all the pixel circuits in the plurality of rows, supply the first power supply signal VDD, and control the light emitting element to emit light by the light emission control signal EM.
In step S710, the scanning signals may be supplied to the pixel circuits row by row so that the DATA signals DATA supplied from the signal input terminals are written to the pixel circuits row by row.
In writing the DATA signals DATA to the plurality of rows of pixel circuits, in a possible implementation manner provided by the embodiments of the present disclosure, the DATA signals DATA may be written to all the plurality of rows of pixel circuits in the display panel row by row, and the scanning may be a forward scanning or a reverse scanning.
In one possible implementation manner provided by the embodiments of the present disclosure, a plurality of rows of the pixel circuits in the display panel may be divided into a plurality of pixel circuit regions, where each pixel circuit region includes at least two rows of pixel circuits. At this time, the supplying of the scan signal to the pixel circuits row by row so that the DATA signals DATA supplied from the signal input terminals are written to the pixel circuits row by row may include: scanning signals are simultaneously supplied to each of the pixel circuit regions so that the DATA signals DATA supplied at the signal input terminals of each of the pixel regions are written to the pixel circuits in each of the pixel circuit regions, respectively, row by row. For example, the scan signals may be simultaneously supplied to the first row of each pixel circuit region, and forward-scanned row by row within each pixel circuit region; or the scanning signals are simultaneously supplied to the last row of each pixel circuit region, and the scanning is reversed row by row in each pixel circuit region.
For example, the multi-row pixel circuit may be divided into two pixel circuit regions, and the two pixel circuit regions may start scanning at the same time, and certainly in practical applications, the multi-row pixel circuit may also be divided into other numbers of pixel circuit regions, which is not specifically limited in this disclosure. As shown in the timing diagram of fig. 8, the scanning time can be reduced by simultaneously supplying the scanning signals to the s pixel circuit regions row by row. For example, the time required for scanning the whole panel line by line is t, the scanning time required for the divisional scanning is only t/s, and s is the number of pixel circuit regions. The refresh frequency of the display panel can be effectively improved.
When a plurality of rows of the pixel circuits include a first pixel circuit region and a second pixel circuit region, scanning is performed line by line in a first direction in the first pixel circuit region and scanning is performed line by line in a second direction in the second pixel circuit region, the first direction and the second direction being opposite. For example, the first pixel circuit region is scanned in a forward direction, and the second pixel circuit region is scanned in a reverse direction. The scanning ending line of the first pixel circuit area and the scanning ending line of the second pixel circuit area are adjacent, the scanning directions of the first pixel circuit area and the second pixel circuit area are opposite, so that the light emitting elements of the scanning ending line of the first pixel circuit area and the light emitting elements of the scanning ending line of the two sides of the second pixel circuit area can emit light at the same time, the problem that the light emitting time of the light emitting elements of the scanning ending line of the first pixel circuit area and the light emitting time of the light emitting elements of the scanning starting line of the second pixel circuit area in the same-direction scanning mode are different, the display picture is flickering and the like is caused is solved, and the display effect is improved.
In step S720, after all writing of the DATA signals DATA of a plurality of rows of the pixel circuits is completed, a light-emitting control signal EM is provided to the pixel circuits so that the first power supply signal VDD provided by the signal input terminal is written into a plurality of rows of the light-emitting units of the pixel circuits.
When the emission control signal EM controls the emission of light from the light emitting elements, in one possible implementation provided by the embodiments of the present disclosure, the emission control signal EM may control the light emitting units of the plurality of rows of pixel circuits to emit light simultaneously. In another possible implementation manner provided by the embodiment of the present disclosure, the light-emitting element may be controlled to emit light in a divisional manner by the emission control signal EM.
A plurality of rows of the pixel circuits may be divided into a plurality of pixel circuit regions including at least two rows of pixel circuits; optionally, the providing the light emitting control signal EM to the pixel circuit to enable the first power supply signal VDD provided by the signal input terminal to be written into a plurality of rows of light emitting cells of the pixel circuit includes: and providing light-emitting control signals EM to the pixel circuit regions region by region so as to write the first power supply signal VDD provided by the signal input end into the light-emitting units of the pixel circuit regions region by region. The gate driver may output the emission control signal EM according to a division condition of the pixel circuits, and may simultaneously supply the emission control signal EM to a plurality of rows of pixel circuits in a pixel circuit region to cause the light emitting cells in the pixel circuit region to emit light simultaneously. As shown in fig. 9, the light emission control signals EM are supplied region by region for the s pixel circuit regions, controlling the region-by-region light emission. Therefore, the impact of light emission on the power supply can be reduced, and the service life of the display device is prolonged.
Optionally, the providing the light emitting control signal EM to the pixel circuit to enable the first power supply signal VDD provided by the signal input terminal to write into the pixel circuit light emitting unit includes: and simultaneously providing the light-emitting control signal EM for each plurality of pixel circuit regions so that the first power supply signal VDD is written into the light-emitting units in each pixel circuit region row by row. For example, the light emission control signals may be simultaneously supplied to the first row of each pixel circuit region, and light may be emitted from the first row to the last row within each pixel circuit region row by row; or simultaneously supplying a light emission control signal to the last row of each pixel circuit region, and emitting light from the last row to the first row within each pixel circuit region. As shown in fig. 10, when a plurality of rows of pixel circuits are divided into s pixel circuit regions each including m rows of pixel circuits, a first-stage emission control signal EM output from a gate driving circuit is supplied to a first row of pixel circuits in each pixel circuit region, a second-stage emission control signal EM is supplied to a second row of pixel circuits in each pixel circuit region, and so on, to drive a display panel to emit light.
For example, when a plurality of rows of pixel circuits are divided into two pixel circuit regions, i.e., a first pixel circuit region and a second pixel circuit region, the display panel may be driven by:
a first possible driving method provided by the embodiment of the present disclosure includes: writing DATA signals DATA to the first pixel circuit region and the second pixel circuit region row by row; the light emitting elements of the first pixel circuit region and the second pixel circuit region are controlled to emit light by the emission control signal EM.
The DATA signals DATA are written into the first pixel circuit region and the second pixel circuit region row by row, the DATA signals DATA are written into the first pixel circuit region and the second pixel circuit region row by row at the same time, or the DATA signals DATA are written into the first pixel circuit region row by row first and then written into the second pixel circuit. The scan order of the first pixel circuit regions may be the same as or opposite to the scan order of the second pixel circuit regions.
The light emitting elements of the first pixel circuit region and the second pixel circuit region are controlled to emit light by the light emission control signal EM, which may be simultaneously supplied to the first pixel circuit region and the second pixel circuit region, or the light emission control signal EM may be supplied to the first pixel circuit region first and then supplied to the second pixel circuit region.
The signal writing and light emission of the first pixel circuit region and the second pixel circuit region may be performed alternately, for example, when the data writing is performed in the first pixel circuit region, the light emission may be performed in the second pixel circuit region.
For example, when the plurality of rows of pixel circuits include a first pixel circuit region and a second pixel circuit region, and the pixel circuit region includes at least two rows of pixel circuits, in a possible embodiment provided by the present disclosure, the driving method of the display panel includes;
providing scanning signals to the pixel circuits in the first pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the first pixel circuit area row by row; simultaneously providing a light-emitting control signal to the pixel circuit of the second pixel circuit region so as to enable the first power supply signal provided by the signal input end to be written into the light-emitting unit of the pixel circuit of the second pixel circuit region simultaneously;
providing scanning signals to the pixel circuits in the second pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the second pixel circuit area row by row; and simultaneously providing a light-emitting control signal for the pixel circuit of the first pixel circuit region so as to enable the first power supply signal provided by the signal input end to be written into the light-emitting unit of the pixel circuit of the first pixel circuit region simultaneously.
The second pixel circuit area can emit light under the control of a light-emitting control signal while the data signal is written into the first pixel circuit area; the first pixel circuit region may emit light under the control of the light emission control signal while the second pixel circuit writes the data signal. Each pixel circuit region turns off light emission before writing of data is started. The first pixel circuit area and the second pixel circuit area are used for alternately writing data signals and emitting light, so that the data writing time of the whole display panel can be saved, and the refreshing frequency is improved.
In another possible embodiment provided by the present disclosure, a driving method of the display panel includes;
providing scanning signals to the pixel circuits in the first pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the first pixel circuit area row by row; providing light-emitting control signals to the pixel circuits in the second pixel circuit area row by row so that the first power supply signals provided by the signal input end are written into the light-emitting units of the pixel circuits in the second pixel circuit area;
providing scanning signals to the pixel circuits in the second pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the second pixel circuit area row by row; and providing light-emitting control signals to the pixel circuits in the first pixel circuit area row by row so that the first power supply signals provided by the signal input end are written into the light-emitting units of the pixel circuits in the first pixel circuit area.
The second pixel circuit region can emit light row by row under the control of the light-emitting control signal while the data signal is written in the first pixel circuit region; the first pixel circuit region may emit light row by row under control of the light emission control signal while the data signal is written in the second pixel circuit. Each pixel circuit region turns off light emission row by row before starting writing data. The first pixel circuit region and the second pixel circuit region are used for alternately writing data signals and emitting light, so that the data writing time of the whole display panel can be saved, the refreshing frequency is improved, and the impact on a power supply can be reduced by emitting light row by row in each pixel circuit region.
It should be noted that although the various steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
It should be noted that although in the above detailed description several sub-circuits of the pixel circuit are mentioned, this division is not mandatory. Indeed, the features and functions of two or more sub-circuits described above may be embodied in one sub-circuit, in accordance with embodiments of the present disclosure. Conversely, the features and functions of one sub-circuit described above may be further divided into embodiments by a plurality of sub-circuits.
As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or program product. Accordingly, various aspects of the present invention may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
Furthermore, the above-described figures are merely schematic illustrations of processes involved in methods according to exemplary embodiments of the invention, and are not intended to be limiting. It will be readily appreciated that the processes illustrated in the above figures are not intended to indicate or limit the temporal order of the processes. In addition, it is also readily understood that these processes may be performed, for example, synchronously or asynchronously in multiple modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (17)
1. A pixel circuit, comprising:
a drive sub-circuit;
a signal input terminal for outputting a data signal and a first power supply signal;
a write-in sub-circuit, respectively connected to the first scan signal terminal, the signal input terminal and the driving sub-circuit, for providing the data signal to the driving sub-circuit under the control of the first scan signal;
the first light-emitting control sub-circuit is respectively connected with the light-emitting control signal end, the signal input end and the driving sub-circuit and is used for providing the first power supply signal for the driving sub-circuit under the driving of the light-emitting control signal;
the energy storage sub-circuit is respectively connected with the driving sub-circuit and the second scanning signal end and is used for storing the signals written by the driving sub-circuit;
the driving sub-circuit is used for writing the data signal into the energy storage sub-circuit in a data writing stage and generating driving current in a light-emitting stage, and the signals output by the second scanning signal end from the data writing stage to the light-emitting stage are the same;
wherein the driving sub-circuit comprises:
the first end of the driving transistor is connected with the writing sub-circuit, and the control end of the driving transistor is connected with the energy storage sub-circuit;
the first switch sub-circuit is respectively connected with the first scanning signal end, the second end of the driving transistor and the energy storage sub-circuit and is used for connecting the control end and the second end of the driving transistor under the control of the first scanning signal;
the initialization sub-circuit is respectively connected with an initialization control signal end, a second end of the driving transistor and a reset signal end and used for responding to an initialization control signal to be conducted so as to transmit a reset signal to the control end of the driving transistor and the first end of the light-emitting element, the reset signal is provided by the signal input end, the initialization control signal is a second scanning signal, the reset signal is input to the signal input end in an initialization stage, the data signal is input to the signal input end in a data writing stage, and the first power supply signal is input to the signal input end in a light-emitting stage.
2. The pixel circuit of claim 1, wherein the drive sub-circuit further comprises:
and the second light-emitting control sub-circuit is respectively connected with the light-emitting control signal end, the second end of the driving transistor and the light-emitting element and is used for transmitting the first power supply signal to the light-emitting element under the control of the light-emitting control signal.
3. The pixel circuit of claim 1, wherein the write sub-circuit comprises:
and the first end of the first transistor is connected with the signal input end, the second end of the first transistor is connected with the first end of the driving transistor, and the control end of the first transistor is connected with the first scanning signal.
4. The pixel circuit of claim 1, wherein the first emission control sub-circuit comprises:
and a first end of the second transistor is connected to the signal input end, a second end of the second transistor is connected to the first end of the driving transistor, and a control end of the second transistor is connected to the light-emitting control signal.
5. The pixel circuit of claim 4, wherein the first switch sub-circuit comprises:
and the first end of the third transistor is connected with the second end of the driving transistor, the second end of the third transistor is connected with the control end of the driving transistor, and the control end of the third transistor is connected with the first scanning signal.
6. The pixel circuit of claim 1, wherein the initialization sub-circuit comprises:
a fifth transistor, a first end of which is connected to the signal input end, a second end of which is connected to the control end of the driving transistor, and the control end of which is connected to the initialization control signal;
and a sixth transistor, wherein a first end of the sixth transistor is connected to the signal input end, a second end of the sixth transistor is connected to the first end of the light emitting element, and a control end of the sixth transistor is connected to the initialization control signal.
7. The pixel circuit according to claim 2, wherein the second emission control sub-circuit includes:
and the first end of the fourth transistor is connected with the second end of the driving transistor, the second end of the fourth transistor is connected with the light-emitting element, and the control end of the fourth transistor is connected with the light-emitting control signal.
8. A driving method of a pixel circuit, for use in the pixel circuit according to any one of claims 1 to 7, the driving method comprising:
providing a first scanning signal to the writing sub-circuit so that the data signal provided by the signal input end is output to the driving sub-circuit;
providing a first scanning signal to the driving sub-circuit to enable a data signal to be written into the energy storage sub-circuit through the driving sub-circuit;
and providing a light-emitting control signal to the first light-emitting control sub-circuit so that the first power supply signal provided by the signal input end is written into the light-emitting element to drive the light-emitting element to emit light.
9. The driving method of a pixel circuit according to claim 8, wherein when the driving sub-circuit includes a driving transistor, a first switching sub-circuit, an initializing sub-circuit, and a second light emitting sub-circuit, the driving method further comprises:
providing an initialization control signal to the initialization sub-circuit to cause the reset signal to be transmitted to the energy storage sub-circuit and the light emitting element;
providing a first scanning signal to the writing sub-circuit so that the data signal provided by the signal input end is output to the driving transistor;
providing the first scan signal to the first switch sub-circuit to cause a data signal to be written into a tank sub-circuit;
and providing a light-emitting control signal to the first light-emitting control sub-circuit and the second light-emitting control sub-circuit so as to write the first power supply signal provided by the signal input end into the light-emitting element and drive the light-emitting element to emit light.
10. A display panel comprising a plurality of rows of pixel circuits according to any one of claims 1 to 7.
11. A driving method of a display panel, for use in the display panel of claim 10, the driving method comprising:
providing scanning signals to the pixel circuits row by row so that the data signals provided by the signal input end are written into the pixel circuits row by row;
after all the data signals of the pixel circuits in a plurality of rows are written, a light-emitting control signal is provided for the pixel circuits, so that the first power supply signal provided by the signal input end is written into a plurality of rows of light-emitting units of the pixel circuits.
12. The method for driving a display panel according to claim 11, wherein the plurality of rows of the pixel circuits includes a plurality of pixel circuit regions including at least two rows of the pixel circuits;
the line-by-line supplying a scanning signal to the pixel circuit so that a data signal supplied from a signal input terminal is written into the pixel circuit line by line, includes:
and simultaneously supplying scanning signals to each pixel circuit region, so that the data signals supplied at the signal input end of each pixel circuit region are respectively written into a plurality of rows of the pixel circuits in the pixel circuit region row by row.
13. The method of driving a display panel according to claim 12, wherein the plurality of rows of the pixel circuits include a first pixel circuit region in which the scanning is performed line by line in a first direction and a second pixel circuit region in which the scanning is performed line by line in a second direction, the first direction and the second direction being opposite to each other.
14. The method for driving a display panel according to claim 11, wherein the plurality of rows of the pixel circuits includes a plurality of pixel circuit regions including at least two rows of the pixel circuits;
the providing of the light emitting control signal to the pixel circuit to cause the first power supply signal provided by the signal input terminal to be written into a plurality of rows of light emitting cells of the pixel circuit includes:
and providing light-emitting control signals to the pixel circuit regions region by region so that the first power supply signals provided by the signal input ends are written into the light-emitting units in the pixel circuit regions region by region.
15. The method for driving a display panel according to claim 11, wherein the plurality of rows of the pixel circuits includes a plurality of pixel circuit regions including at least two rows of the pixel circuits;
the providing of the light emitting control signal to the pixel circuit to cause the first power supply signal provided by the signal input terminal to write into a plurality of rows of the pixel circuit light emitting cells includes:
and simultaneously providing the light emitting control signals to each pixel circuit region so that the first power supply signals are written into the light emitting units in the pixel circuit regions row by row in each pixel circuit region.
16. The method for driving a display panel according to claim 11, wherein the plurality of rows of the pixel circuits include a first pixel circuit region and a second pixel circuit region, the pixel circuit regions include at least two rows of the pixel circuits, the method for driving a display panel comprising;
providing scanning signals to the pixel circuits in the first pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the first pixel circuit area row by row; simultaneously providing a light-emitting control signal to the pixel circuit of the second pixel circuit region so as to enable the first power supply signal provided by the signal input end to be written into the light-emitting unit of the pixel circuit of the second pixel circuit region simultaneously;
providing scanning signals to the pixel circuits in the second pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the second pixel circuit area row by row; and simultaneously providing a light-emitting control signal for the pixel circuit of the first pixel circuit region so as to enable the first power supply signal provided by the signal input end to be written into the light-emitting unit of the pixel circuit of the first pixel circuit region simultaneously.
17. The method for driving a display panel according to claim 11, wherein the plurality of rows of the pixel circuits include a first pixel circuit region and a second pixel circuit region, the pixel circuit regions include at least two rows of the pixel circuits, and the method for driving a display panel includes;
providing scanning signals to the pixel circuits in the first pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the first pixel circuit area row by row; providing light-emitting control signals to the pixel circuits in the second pixel circuit area row by row so that the first power supply signals provided by the signal input end are written into the light-emitting units of the pixel circuits in the second pixel circuit area;
providing scanning signals to the pixel circuits in the second pixel circuit area row by row so that the data signals provided by the signal input end are written into the pixel circuits in the second pixel circuit area row by row; and providing light-emitting control signals to the pixel circuits of the first pixel circuit area row by row so as to write the first power supply signals provided by the signal input end into the light-emitting units of the pixel circuits of the first pixel circuit area.
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| WO2023275676A1 (en) * | 2021-06-30 | 2023-01-05 | 株式会社半導体エネルギー研究所 | Semiconductor device and drive method for semiconductor device |
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