CN111179864A - Pixel driving circuit, driving method thereof, display device and electronic equipment - Google Patents
Pixel driving circuit, driving method thereof, display device and electronic equipment Download PDFInfo
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- CN111179864A CN111179864A CN202010049484.4A CN202010049484A CN111179864A CN 111179864 A CN111179864 A CN 111179864A CN 202010049484 A CN202010049484 A CN 202010049484A CN 111179864 A CN111179864 A CN 111179864A
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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
- G09G3/34—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 by control of light from an independent source
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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Abstract
The present disclosure relates to a pixel driving circuit and a driving method thereof, a display device, and an electronic device, wherein the pixel driving circuit includes a driving unit, a first switch unit, and an energy storage unit, the driving unit includes a first end, a second end, and a control end, the first end of the driving unit is connected to a first signal end, and the second end is connected to a light emitting element; the first end of the first switch unit is connected with the second signal end, the second end of the first switch unit is connected with the control end of the driving unit, and the control end of the first switch unit is connected with the scanning signal end; the first end of the first energy storage unit is connected with the second end of the control end of the driving unit and is connected with a reference power supply end; the first signal terminal is used for outputting an initialization signal in a reset stage and outputting a first power supply signal in a light-emitting stage, and the second signal terminal is used for outputting a reference signal in the reset stage and outputting a data signal in a data writing stage. The pixel driving circuit can increase the light transmittance of the camera under the screen.
Description
Technical Field
The disclosure relates to the technical field of electronic equipment, and in particular to a pixel driving circuit, a driving method thereof, a display device and electronic equipment.
Background
With the development and progress of the technology, the screen occupation ratio of the electronic equipment is required to be higher and higher. The front camera of the electronic equipment seriously hinders the improvement of the screen occupation ratio of the electronic equipment.
In order to further improve the screen occupation ratio of the electronic equipment, the under-screen camera technology has come into existence, and the under-screen camera technology improves the screen occupation ratio by arranging a front-facing camera below a display device. At present, the problem that the regional light transmittance of a camera is insufficient exists in the camera technology under a screen.
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 driving circuit, a driving method thereof, a display device, and an electronic apparatus, so as to solve at least a problem of insufficient light transmittance of a camera area in an off-screen camera technology to a certain extent.
According to a first aspect of the present disclosure, there is provided a pixel driving circuit comprising:
the driving unit comprises a first end, a second end and a control end, wherein the first end of the driving unit is connected with the first signal end, and the second end of the driving unit is connected with the light-emitting element;
the first end of the first switch unit is connected with the second signal end, the second end of the first switch unit is connected with the control end of the driving unit, and the control end of the first switch unit is connected with the scanning signal end;
the first end of the first energy storage unit is connected to the control end of the driving unit, and the second end of the first energy storage unit is connected to a reference power supply end;
the first signal end is used for outputting an initialization signal in a reset stage and outputting a first power supply signal in a light-emitting stage, the second signal end is used for outputting a reference signal in the reset stage and outputting a data signal in a data writing stage, the first switch unit is switched on in response to the scanning signal in the reset stage to transmit the reference signal to a control end of a drive unit, and the drive unit is switched on to transmit the initialization signal to the light-emitting element; the first switch unit is conducted in response to the scanning signal in a data writing phase so as to write the data signal into the first energy storage unit.
According to a second aspect of the present disclosure, there is provided a driving method of a pixel driving circuit, for the pixel driving circuit described above, the method including:
the first switch unit is conducted by utilizing the scanning signal, the reference signal is transmitted to the control end of the driving unit, and the driving unit is conducted to enable the initialization signal to be transmitted to the light-emitting element;
the first switch unit is conducted by utilizing the scanning signal, and the data signal is stored in the first energy storage unit;
the driving unit is conducted by using the data signal in the first energy storage unit to transmit the first power signal to the light-emitting element, so that the light-emitting element is driven to emit light.
According to a third aspect of the present disclosure, there is provided a display device including:
a first display area;
and the light transmittance of the first display area is greater than that of the second display area, and the pixel driving circuit is arranged on the first display area.
According to a fourth aspect of the present disclosure, there is provided an electronic apparatus including the display device described above.
The pixel driving circuit provided by the embodiment of the disclosure provides an initialization signal through the first signal terminal, and provides a reference signal through the second signal terminal, so that the light-emitting element can be reset in a reset stage, and the need of setting an independent reset unit in the pixel driving circuit to reset the pixel driving circuit is avoided, thereby reducing the number of routing lines and transistors in a driving circuit layer of a display device, increasing the light transmittance of a camera area under a screen, and improving the imaging quality of the camera under the screen.
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 driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 2 is a schematic diagram of a second pixel driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 3 is a schematic diagram of a third pixel driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 4 is a schematic diagram of a fourth pixel driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 5 is a schematic diagram of a fifth pixel driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 6 is a timing diagram of a pixel driving circuit according to an exemplary embodiment of the disclosure;
fig. 7 is a timing diagram of another pixel driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 8 is a flowchart of a driving method of a pixel driving circuit according to an exemplary embodiment of the present disclosure;
fig. 9 is a schematic view of a display device provided in an exemplary embodiment of the present disclosure;
fig. 10 is a schematic diagram of an electronic device according to an exemplary embodiment of the disclosure.
In the figure: 110. a drive unit; 120. a first switch unit; 130. a first energy storage unit; 140. a first signal terminal; 150. a second signal terminal; 160. a light emitting unit; 170. a second energy storage unit; 180. a first light emission control unit; 190. a second light emission control unit; 210. a first display area; 211. a first pixel unit; 212. a first power line; 220. a second display area; 221. a second pixel unit; 222. a second power supply line; 300. a camera; 20. a frame; 30. a main board; 40. a battery; 50. a rear cover;
DT, drive transistor; t1, a first transistor; t2, a second transistor; t3, a third transistor; c1, a first energy storage capacitor; c2 and a second energy 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.
In order to implement some specific functions in a display device of an electronic apparatus, it is often necessary to provide one or more designated display areas in the display device, and the optical wave transmittance of the designated display areas needs to be greater than the optical wave transmittance of other areas of the display device. For example, the area corresponding to the lower camera.
An exemplary embodiment of the present disclosure first provides a pixel driving circuit, as shown in fig. 1, the pixel driving circuit including: a driving unit 110, a first switching unit 120, and a first energy storage unit 130; the driving unit 110 includes a first terminal, a second terminal and a control terminal, the first terminal of the driving unit 110 is connected to the first signal terminal 140, and the second terminal of the driving unit 110 is connected to the light emitting element 160. The first terminal of the first switch unit 120 is connected to the second signal terminal 150, the second terminal of the first switch unit 120 is connected to the control terminal of the driving unit 110, and the control terminal of the first switch unit 120 is connected to the terminal of the scan signal Sn. The first terminal of the first energy storage unit 130 is connected to the control terminal of the driving unit 110, and the second terminal of the first energy storage unit 130 is connected to a reference power source terminal.
The first signal terminal 140 is configured to output an initialization signal Vint in a reset phase and output a first power signal VDD in a light emitting phase, the second signal terminal 150 is configured to output a reference signal Vref in the reset phase and output a data signal Vdata in a data writing phase, the first switch unit 120 is turned on in response to the scan signal Sn in the reset phase to transmit the reference signal Vref to the control terminal of the driving unit 110, and the driving unit 110 is turned on to transmit the initialization signal Vint to the light emitting element 160; the first switch unit 120 is turned on in response to the scan signal Sn to write the data signal Vdata into the first energy storage unit 130 during the data writing phase.
The pixel driving circuit provided by the embodiment of the disclosure provides the initialization signal Vint through the first signal terminal 140, and the second signal terminal 150 provides the reference signal Vref, so that the light emitting element 160 can be reset in the reset stage, and the need of setting an independent reset unit in the pixel driving circuit to reset the pixel driving circuit is avoided, thereby reducing the number of routing lines and transistors in the driving circuit layer of the display device, increasing the light transmittance of the area of the camera under the screen, and improving the imaging quality of the camera under the screen.
Further, as shown in fig. 2, the pixel driving circuit provided by the embodiment of the present disclosure may further include a second energy storage unit 170, a first light emission control unit 180, and a second light emission control unit 190. A first terminal of the second energy storage unit 170 is respectively connected to the second terminal of the first energy storage unit 130 and the second terminal of the driving unit 110, and a second terminal of the second energy storage unit 170 is connected to a reference power source terminal. The first terminal of the first light-emitting control unit 180 is connected to the first signal terminal 140, the second terminal of the first light-emitting control unit 180 is connected to the first terminal of the driving transistor DT, the control terminal of the first light-emitting control unit 180 is configured to receive a light-emitting control signal, and the first light-emitting control unit 180 is turned on in response to the light-emitting control signal to transmit the initialization signal Vint to the first terminal of the driving unit 110 in the reset phase and transmit the first power signal VDD to the first terminal of the driving unit 110 in the light-emitting phase.
The first end of the second light-emitting control unit 190 is connected to the second end of the driving unit 110, the second end of the second light-emitting control unit 190 is connected to the light-emitting element 160, the control end of the second light-emitting control unit 190 is configured to receive the light-emitting control signal, and the second light-emitting control unit 190 is turned on in response to the light-emitting control signal to transmit the initialization signal Vint to the light-emitting element 160 in the reset phase and transmit the first power signal VDD to the light-emitting element 160 in the light-emitting phase.
Wherein the light emission control signal may include a first light emission control signal and a second light emission control signal. The first light-emitting control signal is connected to a control terminal of the first light-emitting control unit 180. The first light emission control signal is used to turn on the first light emission control unit 180 in the reset phase, the compensation phase, and the light emission phase, and turn off the first light emission control unit 180 in the data write phase. The second light-emitting control signal is connected to the control terminal of the second light-emitting control unit 190, and the second light-emitting control signal is used to turn on the second light-emitting control unit 190 in the reset phase and the light-emitting phase, and turn off the second light-emitting control unit 190 in the compensation phase and the data writing phase.
Or the light emitting control signal may include a first light emitting control signal, the control terminals of the first light emitting control unit 180 and the second light emitting control unit 190 are both connected to the first light emitting control signal, the first light emitting control signal is used to turn on the first light emitting control unit 180 and the second light emitting control unit 190 in the initialization phase, the compensation phase and the light emitting phase, and turn off the first light emitting control unit 180 and the second light emitting control unit 190 in the data writing phase.
The following will explain each unit of the pixel driving circuit provided by the embodiment of the present disclosure in detail:
as shown in fig. 3, the driving unit 110 includes a driving transistor DT, a first terminal of the driving transistor DT is connected to the first signal terminal 140, a second terminal of the driving transistor DT is connected to the light emitting element 160, a control terminal of the driving transistor DT is connected to the second terminal of the first switching unit 120, and the driving transistor DT transmits an initialization signal Vint to the light emitting element 160 in a reset phase and transmits the first power signal VDD to the light emitting element 160 in a light emitting phase.
The first switching unit 120 includes a first transistor T1, a first terminal of the first transistor T1 is connected to the second signal terminal 150, a second terminal of the first transistor T1 is connected to the control terminal of the driving transistor DT, a control terminal of the first transistor T1 is connected to the terminal of the scan signal Sn, the first transistor T1 is turned on in response to the scan signal Sn to transmit the reference signal Vref to the control terminal of the driving transistor DT during the reset phase, and the first transistor T1 is turned on in response to the scan signal Sn to write the data signal Vdata into the first energy storage unit 130 during the data write phase.
The first energy storage unit 130 comprises a first energy storage capacitor C1, a first end of the first energy storage capacitor C1 is connected to the control end of the driving transistor DT, and a second end of the first energy storage capacitor C1 is connected to a reference power supply terminal;
the second energy storage unit 170 includes a second energy storage capacitor C2, a first end of the second energy storage capacitor C2 is connected to the second end of the first energy storage capacitor C1 and the second end of the driving transistor DT, respectively, and a second end of the second energy storage capacitor C2 is connected to a reference power source terminal.
In one possible embodiment, as shown in fig. 4, the first light emission control unit 180 includes a second transistor T2, a first terminal of the second transistor T2 is connected to the first signal terminal 140, a second terminal of the second transistor T2 is connected to a first terminal of the driving transistor DT, a control terminal of the second transistor T2 is configured to receive the first light emission control signal, and the second transistor T2 is turned on in response to the first light emission control signal to transmit the initialization signal Vint to the first terminal of the driving unit 110 in the reset phase and transmit the first power signal VDD to the first terminal of the driving unit 110 in the light emission phase. The second light emitting control unit 190 includes a third transistor T3, a first terminal of the third transistor T3 is connected to the second terminal of the driving unit 110, a second terminal of the third transistor T3 is connected to the light emitting element 160, a control terminal of the third transistor T3 is configured to receive a second light emitting control signal, and the third transistor T3 is turned on in response to the second light emitting control signal to transmit the initialization signal Vint to the light emitting element 160 during the reset phase and transmit the first power signal VDD to the light emitting element 160 during the light emitting phase.
In another possible embodiment, as shown in fig. 5, the first light emission control unit 180 includes a second transistor T2, a first terminal of the second transistor T2 is connected to the first signal terminal 140, a second terminal of the second transistor T2 is connected to a first terminal of the driving transistor DT, a control terminal of the second transistor T2 is configured to receive the first light emission control signal, and the second transistor T2 is turned on in response to the first light emission control signal to transmit the initialization signal Vint to the first terminal of the driving unit 110 in the reset phase and transmit the first power signal VDD to the first terminal of the driving unit 110 in the light emission phase. The second light emitting control unit 190 includes a third transistor T3, a first terminal of the third transistor T3 is connected to the second terminal of the driving unit 110, a second terminal of the third transistor T3 is connected to the light emitting element 160, a control terminal of the third transistor T3 is configured to receive the first light emitting control signal, and the third transistor T3 is turned on in response to the first light emitting control signal to transmit the initialization signal Vint to the light emitting element 160 during the reset phase and transmit the first power signal VDD to the light emitting element 160 during the light emitting phase.
In the present exemplary embodiment, each transistor has a control terminal, a first terminal, and a second terminal. Specifically, the control terminal of each transistor may be a gate, the first terminal may be a source, and the second terminal may be a drain; alternatively, the control terminal of each transistor may be a gate, the first terminal may be a drain, and the second terminal may be a source. Further, each transistor may be an enhancement transistor or a depletion transistor, which is not particularly limited in this exemplary embodiment.
On the basis, all the transistors can be N-type thin film transistors, and the driving voltage of each transistor is high-level voltage; alternatively, all the transistors may be P-type thin film transistors, and the driving voltage of each transistor is a low level voltage.
When the light emission control signal includes the first light emission control signal and the second light emission control signal, a driving timing diagram of the pixel driving circuit provided by the embodiment of the present disclosure is shown in fig. 6. The operation of the pixel driving circuit will be described in detail with reference to the operation timing chart of the pixel driving circuit shown in fig. 6. The level states of the first light emission control signal, the second light emission control signal, and the scan signal Sn at each operation stage are shown in the figure.
At time t1 (reset phase): the first light-emitting control signal is at a high level, the second light-emitting control signal is at a high level, and the scan signal Sn is at a high level, the first signal terminal 140 outputs the initialization signal Vint, and the second signal terminal 150 outputs the reference signal Vref. The first transistor T1, the second transistor T2, and the third transistor T3 are turned on. The reference voltage is written into point a, and at this time, the driving transistor DT operates in the linear region, and the initialization signal Vint output by the first signal terminal 140 is transmitted to the light emitting element 160, so that the light emitting element 160 is reset, and the phenomenon of image retention or image smearing of the display image caused by the residual signal of the previous frame of image is avoided.
During the time period t2 (compensation phase): the first light-emitting control signal is at a high level, the second light-emitting control signal is at a low level, and the scan signal Sn is at a high level, the first signal terminal 140 outputs a first power signal VDD, and the second signal terminal 150 outputs a reference signal Vref. The first transistor T1 and the second transistor T2 are turned on, and the third transistor T3 is turned off. The voltage at point A is the reference voltage, and the voltage at point B is charged to Vref-Vth, where Vth is the threshold voltage of the driving transistor DT.
At time period t3 (data write phase): the first light-emitting control signal is at a low level, the second light-emitting control signal is at a low level, the scan signal Sn is at a high level, the first signal terminal 140 outputs a first power signal VDD, and the second signal terminal 150 outputs a data signal Vdata. The first transistor T1 is turned on, and the second transistor T2 and the third transistor T3 are turned off. The data signal Vdata is written into the point A, the jump quantity of the voltage at the point A is Vdata-Vref at the moment, the jump quantity is transmitted to the point B through the first energy storage capacitor C1, then the jump quantity is shared by the first energy storage capacitor C1 and the second energy storage capacitor C2, namely the jump quantity at the point B is: (Vdt-Vref). times.C 1/(C1+ C2), where the voltage at point B is:
at time period t4 (light emission phase): the first light-emitting control signal is at a high level, the second light-emitting control signal is at a high level, the scan signal Sn is at a low level, the first signal terminal 140 outputs a first power signal VDD, and the second signal terminal 150 outputs a reference signal Vref. The first transistor T1 is turned off, the second transistor T2 and the third transistor T3 are turned off, and the driving transistor DT operates in a saturation region. Since the voltage at point B is Vb:
the driving current of the light emitting element 160 is independent of the threshold voltage of the driving transistor DT by the above formula, that is, the pixel driving circuit is compensated by the first energy storage unit 130 and the second energy storage unit 170, so as to avoid the problem that the display effect of the display device is affected by different threshold voltages of the driving transistors DT.
When the light emission control signal includes the first light emission control signal, a driving timing diagram of the pixel driving circuit provided by the embodiment of the present disclosure is shown in fig. 7. The operation of the pixel driving circuit will be described in detail with reference to the operation timing chart of the pixel driving circuit shown in fig. 7. The level states of the first light emission control signal, the second light emission control signal, and the scan signal Sn at each operation stage are shown in the figure.
At time t1 (reset phase): the first light-emitting control signal is at a high level, the scan signal Sn is at a high level, the first signal terminal 140 outputs the initialization signal Vint, and the second signal terminal 150 outputs the reference signal Vref. The first transistor T1, the second transistor T2, and the third transistor T3 are turned on. The reference voltage is written into point a, and at this time, the driving transistor DT operates in the linear region, and the initialization signal Vint output by the first signal terminal 140 is transmitted to the light emitting element 160, so that the light emitting element 160 is reset, and the phenomenon of image retention or image smearing of the display image caused by the residual signal of the previous frame of image is avoided.
During the time period t2 (compensation phase): the first light-emitting control signal is at a high level, the scan signal Sn is at a high level, the first signal terminal 140 outputs a first power signal VDD, and the second signal terminal 150 outputs a reference signal Vref. The first transistor T1, the second transistor T2, and the third transistor T3 are turned on. The voltage at point A is the reference voltage, and the voltage at point B is charged to Vref-Vth, where Vth is the threshold voltage of the driving transistor DT.
At time period t3 (data write phase): the first light-emitting control signal is at a low level, the scan signal Sn is at a high level, the first signal terminal 140 outputs a first power signal VDD, and the second signal terminal 150 outputs a data signal Vdata. The first transistor T1 is turned on, and the second transistor T2 and the third transistor T3 are turned off. The data signal Vdata is written into the point A, the jump quantity of the voltage at the point A is Vdata-Vref at the moment, the jump quantity is transmitted to the point B through the first energy storage capacitor C1, then the jump quantity is shared by the first energy storage capacitor C1 and the second energy storage capacitor C2, namely the jump quantity at the point B is: (Vdt-Vref). times.C 1/(C1+ C2), where the voltage at point B is:
at time period t4 (light emission phase): the first light-emitting control signal is at a high level, the scan signal Sn is at a low level, the first signal terminal 140 outputs a first power signal VDD, and the second signal terminal 150 outputs a reference signal Vref. The first transistor T1 is turned off, the second transistor T2 and the third transistor T3 are turned off, and the driving transistor DT operates in a saturation region. Since the voltage at point B is Vb:
the driving current of the light emitting element 160 is independent of the threshold voltage of the driving transistor DT by the above formula, that is, the pixel driving circuit is compensated by the first energy storage unit 130 and the second energy storage unit 170, so as to avoid the problem that the display effect of the display device is affected by different threshold voltages of the driving transistors DT.
It should be noted that: in the above specific embodiment, all transistors are N-type transistors; those skilled in the art will readily appreciate that pixel drive circuits provided in accordance with the present disclosure have all transistors in the form of P-type transistors. In an exemplary embodiment of the present disclosure, all the transistors may be P-type transistors, where the first power signal VDD is a low level signal, the cathode of the OLED is connected to the second terminal of the third transistor T3, and the anode of the OLED is connected to a high level signal. The adoption of the all-P type thin film transistor has the following advantages: for example, strong noise suppression; for example, low level is easy to realize in charge management because of low level conduction; for example, the P-type thin film transistor has simple manufacturing process and relatively low price; such as better stability of the P-type thin film transistor, etc. 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 pixel driving circuit provided by the embodiment of the disclosure provides the initialization signal Vint through the first signal terminal 140, and provides the reference signal Vref through the second signal terminal 150, so that the light emitting element 160 can be reset in the reset stage, and the need of setting an independent reset unit in the pixel driving circuit to reset the pixel driving circuit is avoided, thereby reducing the number of wires in the driving circuit layer of the display device, increasing the light transmittance of the area of the camera under the screen, and improving the imaging quality of the camera under the screen. The driving unit 110 can be compensated by the first energy storage unit 130 and the second energy storage unit 170, so that the display effect of the display device is prevented from being affected by different threshold voltages of the plurality of driving transistors DT.
The exemplary embodiment of the present disclosure also provides a driving method of a pixel driving circuit, which is used for the pixel driving circuit, and as shown in fig. 8, the driving method includes:
step S810, turning on the first switch unit by using the scan signal, transmitting the reference signal to the control end of the driving unit, and turning on the driving unit to transmit the initialization signal to the light emitting element;
step S820, turning on the first switch unit by using the scan signal, and storing the data signal in the first energy storage unit;
in step S830, the driving unit is turned on by the data signal in the first energy storage unit to transmit the first power signal to the light emitting element, so as to drive the light emitting element to emit light.
The pixel driving circuit provided by the embodiment of the disclosure provides the initialization signal Vint through the first signal terminal 140, and provides the reference signal Vref through the second signal terminal 150, so that the light emitting element 160 can be reset in the reset stage, and the need of setting an independent reset unit in the pixel driving circuit to reset the pixel driving circuit is avoided, thereby reducing the number of wires in the driving circuit layer of the display device, increasing the light transmittance of the area of the camera under the screen, and improving the imaging quality of the camera under the screen.
Further, when the pixel driving circuit further includes a second energy storage unit, a first light-emitting control unit, and a second light-emitting control unit, the driving method of the pixel driving circuit provided in the embodiment of the present disclosure further includes:
in step S840, the first switch unit and the first light emitting control unit are turned on by the scanning signal and the light emitting control signal, and the threshold voltage of the driving unit is written into the second terminal of the driving unit.
In step S810, the first switch unit may be turned on by a scan signal, and a reference signal may be transmitted to the control terminal of the driving unit to turn on the driving unit so that an initialization signal is transmitted to the light emitting element.
The first light-emitting control signal is at a high level, the second light-emitting control signal is at a high level, the scanning signal is at a high level, the first signal end outputs an initialization signal, and the second signal end outputs a reference signal. The first transistor, the second transistor, and the third transistor are turned on. The reference voltage is written into the point A, the driving transistor works in a linear region at the moment, the initialization signal output by the first signal end is transmitted to the light-emitting element, the light-emitting element is reset, and the phenomenon that residual images or smear of a display picture are caused by residual signals of a previous frame of picture is avoided.
In step S840, the first switching unit and the first light emission control unit may be turned on using the scan signal and the light emission control signal, and the threshold voltage of the driving unit may be written into the second terminal of the driving unit.
The first light-emitting control signal is at a high level, the second light-emitting control signal is at a low level, the scanning signal is at a high level, the first signal end outputs a first power supply signal, and the second signal end outputs a reference signal. The first transistor and the second transistor are turned on, and the third transistor is turned off. The voltage at point A is the reference voltage, and the voltage at point B is charged to Vref-Vth, where Vth is the threshold voltage of the driving transistor.
In step S820, the first switch unit is turned on by the scan signal to store the data signal in the first energy storage unit
The first light-emitting control signal is at a low level, the second light-emitting control signal is at a low level, the scanning signal is at a high level, the first signal end outputs a first power signal, and the second signal end outputs a data signal. The first transistor is turned on, and the second transistor and the third transistor are turned off. The data signal is written into the point A, the jumping quantity of the voltage of the point A is Vdata-Vref at the moment, the jumping quantity is transmitted to the point B through the first energy storage capacitor, then the first energy storage capacitor and the second energy storage capacitor share the jumping quantity, namely the jumping quantity of the point B is as follows: (Vdt-Vref). times.C 1/(C1+ C2), where the voltage at point B is:
in step S830, the driving unit may be turned on to transmit the first power signal to the light emitting element by using the data signal in the first energy storage unit, so as to drive the light emitting element to emit light.
The first light-emitting control signal is at a high level, the second light-emitting control signal is at a high level, the scanning signal is at a low level, the first signal end outputs a first power supply signal, and the second signal end outputs a reference signal. The first transistor is turned off, the second transistor and the third transistor are turned off, and the driving transistor operates in a saturation region. Since the voltage at point B is Vb:
the driving current of the light-emitting element is independent of the threshold voltage of the driving transistor by the above formula, that is, the first energy storage unit and the second energy storage unit compensate the pixel driving circuit, so that the problem that the display effect of the display device is affected due to different threshold voltages of the driving transistors is avoided.
The pixel driving circuit driving method is described above in terms of the light emission control signal including the first light emission control signal and the second light emission control signal. The driving method of the pixel driving circuit when the light-emitting control signal includes the first light-emitting control signal is similar to that described above, and the details of the embodiments of the disclosure are not repeated herein.
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.
The exemplary embodiment of the present disclosure also provides a display device, as shown in fig. 9, which includes a first display region 210, a second display region 220, and the pixel driving circuit described above. The light transmittance of the first display region 210 is greater than that of the second display region 220; the pixel driving circuit is used to drive the light emitting elements of the first display region 210.
The first display region 210 includes a plurality of rows of first pixel units 211, each of the first pixel units 211 is correspondingly connected with a first pixel driving circuit, and the first pixel driving circuit is a pixel driving circuit provided by the embodiment of the disclosure; the second display region 220 includes a plurality of rows of second pixel units 221, each of the second pixel units 221 is correspondingly connected with a second pixel driving circuit, which may be a conventional driving circuit, such as a 3T1C circuit.
On this basis, the display device further comprises: a plurality of first power lines 212 and a plurality of second power lines 222, wherein each of the first power lines 212 is connected to the first signal terminals of a row of the first pixel circuits, and the plurality of first power lines 212 respectively receive the first power signal VDD and the initialization signal Vint. Each of the second power lines 222 is connected to the first power signal terminals of a row of the second pixel circuits, and a plurality of the second power lines 222 is connected to the first power output terminal to receive the first power signal VDD.
The first power supply signal terminal is a port of the second pixel driving circuit for inputting the first power supply signal, and the first power supply output terminal is a port for providing the first power supply signal for the display panel from the outside.
For example, the first display area may be a bent portion of a curved screen or an area where a camera under the screen is located. The first display region may include at least one light emitting element, which may be a red pixel unit, a blue pixel unit, or a green pixel unit; the second display region may include at least one light emitting element, which may be a red pixel unit, a blue pixel unit, or a green pixel unit.
Since the first display area is a small area of the whole display area, which is insensitive to the voltage drop of the first power supply signal, the first power lines of the light emitting elements in the first display area may be in a row design, i.e., one first power line is used for one row of light emitting cells in the first display area. The first power line is used for transmitting an initialization signal and a first power signal.
It is to be noted that the first power supply line and the second power supply line are arranged in rows exemplarily shown in the above-described embodiments for display in a column scanning manner. In practical applications, the first power line and the second power line may also be arranged in a column, that is, for displaying in a row scanning manner, which is not particularly limited in the embodiments of the present disclosure.
The display device provided by the embodiment of the present disclosure may be an OLED display device including a plurality of OLED light emitting elements, and the light emitting elements may include a pixel electrode layer, a light emitting layer, and a common electrode layer. The second terminal of the driving transistor DT is connected to the pixel electrode layer.
It is understood that the display device provided by the embodiments of the present disclosure may be an LCD display device including a plurality of LCD light emitting elements including a pixel electrode layer, a liquid crystal layer, and a common electrode layer. The second terminal of the driving transistor may be connected to the pixel electrode layer
The exemplary embodiment of the present disclosure also provides an electronic device including the display device described above.
The display device may include any product or component having a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, and a navigator.
As shown in fig. 10, the electronic device provided in the embodiment of the present disclosure further includes a camera 300, a bezel 20, a main board 30, a battery 40, and a rear cover 50. Wherein, the display device is mounted on the frame 20 to form a display surface of the electronic device, and the display device serves as a front shell of the electronic device. The rear cover 50 is adhered to the frame by double-sided adhesive, and the display device, the frame 20 and the rear cover 50 form an accommodating space for accommodating other electronic elements or functional modules of the electronic device. Meanwhile, the display device forms a display surface of the electronic apparatus for displaying information such as images, texts, and the like. The Display device may be a Liquid Crystal Display (LCD) or an organic light-Emitting Diode (OLED) Display.
A glass cover plate may be provided on the display device. The glass cover plate can cover the display device to protect the display device and prevent the display device from being scratched or damaged by water.
The display device may be a full-screen. At this time, the display device may display information in a full screen, so that the electronic apparatus has a large screen occupation ratio. The display device includes a first display area 210 and a second display area 220. The camera 300 in the electronic device may be disposed below the first display area 210, that is, on a side of the first display area away from the light emitting side, and the first display area with high transmittance may increase the intensity of light received by the camera 300. Wherein the camera 300 may be a front camera. Functional modules such as proximity sensor can hide in display device below, and electronic equipment's fingerprint identification module can set up under electronic equipment's the back or the screen.
The bezel 20 may be a hollow frame structure. The material of the frame 20 may include metal or plastic. The main board 30 is mounted inside the receiving space. For example, the main board 30 may be mounted on the frame 20 and accommodated in the accommodating space together with the frame 20. The main board 30 is provided with a grounding point to realize grounding of the main board 30. One or more of the functional modules such as a motor, a microphone, a speaker, a receiver, an earphone interface, a universal serial bus interface (USB interface), a camera, a proximity sensor, an ambient light sensor, a gyroscope, and a processor may be integrated on the main board 30. Meanwhile, the display device may be electrically connected to the main board 30.
The main board 30 is provided with a display control circuit. The display control circuit outputs an electric signal to the display device to control the display device to display information.
The battery 40 is mounted inside the receiving space. For example, the battery 40 may be mounted on the frame 20 and be accommodated in the accommodating space together with the frame 20. The battery 40 may be electrically connected to the motherboard 30 to enable the battery 40 to power the electronic device. The main board 30 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 40 to the various electronic components in the electronic device.
The rear cover 50 serves to form an outer contour of the electronic apparatus. The rear cover 50 may be integrally formed. In the forming process of the rear cover 50, a rear camera hole, a fingerprint identification module mounting hole and the like can be formed in the rear cover 50.
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 (12)
1. A pixel driving circuit, comprising:
the driving unit comprises a first end, a second end and a control end, wherein the first end of the driving unit is connected with the first signal end, and the second end of the driving unit is connected with the light-emitting element;
the first end of the first switch unit is connected with the second signal end, the second end of the first switch unit is connected with the control end of the driving unit, and the control end of the first switch unit is connected with the scanning signal end;
the first end of the first energy storage unit is connected to the control end of the driving unit; the second end of the first energy storage unit is connected with a reference power supply end;
the first signal end is used for outputting an initialization signal in a reset stage and outputting a first power supply signal in a light-emitting stage, the second signal end is used for outputting a reference signal in the reset stage and outputting a data signal in a data writing stage, the first switch unit is switched on in response to the scanning signal in the reset stage to transmit the reference signal to a control end of a drive unit, and the drive unit is switched on to transmit the initialization signal to the light-emitting element; the first switch unit is conducted in response to the scanning signal in a data writing phase so as to write the data signal into the first energy storage unit.
2. The pixel driving circuit according to claim 1, wherein the pixel driving circuit further comprises:
and the first end of the second energy storage unit is respectively connected with the second end of the first energy storage unit and the second end of the driving unit, and the second end of the second energy storage unit is connected with the reference power supply end.
3. The pixel driving circuit according to claim 1, wherein the driving unit includes:
the first end of the driving transistor is connected with the first signal end, the second end of the driving transistor is connected with the light-emitting element, the control end of the driving transistor is connected with the second end of the first switch unit, the driving transistor transmits the initialization signal to the light-emitting element in the reset stage, and transmits the first power supply signal to the light-emitting element in the light-emitting stage.
4. The pixel driving circuit according to claim 3, wherein the first switching unit includes:
the first transistor is connected with the second signal end, the second end of the first transistor is connected with the control end of the driving unit, the control end of the first transistor is connected with the scanning signal end, the first transistor is conducted in response to the scanning signal in the reset stage so as to transmit the reference signal to the control end of the driving transistor, and the first transistor is conducted in response to the scanning signal in the data writing stage so as to write the data signal into the first energy storage unit.
5. The pixel driving circuit according to claim 1, wherein the pixel driving circuit further comprises:
a first light emitting control unit, a first end of which is connected to the first signal end, a second end of which is connected to the first end of the driving unit, a control end of which is used for receiving a first light emitting control signal, and the first light emitting control unit is turned on in response to the first light emitting control signal to transmit the initialization signal to the first end of the driving unit in a reset phase and transmit the first power supply signal to the first end of the driving unit in a light emitting phase;
a second light-emitting control unit, a first end of the second light-emitting control unit being connected to a second end of the driving unit, a second end of the second light-emitting control unit being connected to the light-emitting element, a control end of the second light-emitting control unit being configured to receive a second light-emitting control signal, the second light-emitting control unit being turned on in response to the second light-emitting control signal, so as to transmit the initialization signal to the light-emitting element in a reset phase and transmit the first power signal to the light-emitting element in a light-emitting phase.
6. The pixel driving circuit according to claim 1, wherein the pixel driving circuit further comprises:
a first light emitting control unit, a first end of which is connected to the first signal end, a second end of which is connected to the first end of the driving unit, a control end of which is used for receiving a first light emitting control signal, and the first light emitting control unit is turned on in response to the first light emitting control signal to transmit the initialization signal to the first end of the driving unit in a reset phase and transmit the first power supply signal to the first end of the driving unit in a light emitting phase;
a second light-emitting control unit, a first end of the second light-emitting control unit being connected to a second end of the driving unit, a second end of the second light-emitting control unit being connected to the light-emitting element, a control end of the second light-emitting control unit being configured to receive a first light-emitting control signal, the second light-emitting control unit being turned on in response to the first light-emitting control signal to transmit the initialization signal to the light-emitting element in a reset phase and transmit the first power signal to the light-emitting element in a light-emitting phase.
7. A driving method of a pixel driving circuit, for use in the pixel driving circuit according to any one of claims 1 to 6, the driving method comprising:
the first switch unit is conducted by utilizing the scanning signal, the reference signal is transmitted to the control end of the driving unit, and the driving unit is conducted to enable the initialization signal to be transmitted to the light-emitting element;
the first switch unit is conducted by utilizing the scanning signal, and the data signal is stored in the first energy storage unit;
the driving unit is conducted by using the data signal in the first energy storage unit to transmit the first power signal to the light-emitting element, so that the light-emitting element is driven to emit light.
8. A display device, characterized in that the display device comprises:
a first display area;
a second display region, the light transmittance of the first display region being greater than the light transmittance of the second display region, the first display region being provided with the pixel driving circuit according to any one of claims 1 to 6.
9. The display device according to claim 8, wherein the first display region includes a plurality of rows of first pixel units, each of the first pixel units is connected with a first pixel driving circuit, and the first pixel driving circuit is any one of the pixel driving circuits 1 to 6;
the display device further includes:
each first power line is connected with the first signal end of one row of the first pixel circuits, and the first power lines respectively receive the first power signals and the initialization signals.
10. The display device according to claim 9, wherein the second display region includes a plurality of rows of second pixel units, each of the second pixel units being connected with a second pixel driving circuit;
the display device further includes:
and each second power line is respectively connected with the first power signal end and the first power output end of one row of the second pixel circuits.
11. An electronic device characterized in that the electronic device comprises the display device according to any one of claims 8 to 10.
12. The electronic device according to claim 11, wherein the electronic device further comprises a camera, and the camera is disposed on a side of the first display area of the display device away from the light-emitting side.
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