CN111028776B - Pixel driving circuit, display panel, display device and pixel driving method - Google Patents
Pixel driving circuit, display panel, display device and pixel driving method Download PDFInfo
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- CN111028776B CN111028776B CN201911379026.0A CN201911379026A CN111028776B CN 111028776 B CN111028776 B CN 111028776B CN 201911379026 A CN201911379026 A CN 201911379026A CN 111028776 B CN111028776 B CN 111028776B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The invention discloses a pixel driving circuit, a display panel, a display device and a pixel driving method. Wherein, the pixel drive circuit includes: the device comprises an amplitude setting module, a driving module, a first capacitor, a pixel light-emitting unit, a switch module and a first capacitor; the switch module is used for transmitting a turn-off voltage to the control end of the driving module according to the electric potential of the control end of the switch module, the turn-off voltage enables the driving module to stop generating driving current, and the control end of the switch module is used for receiving a second data signal; the first capacitor comprises a first polar plate and a second polar plate, the first polar plate is electrically connected with the control end of the switch module, and the second polar plate is used for receiving a pulse width control signal; the second data signal and the pulse width control signal are commonly used for controlling the conduction duration of the switch module. The technical scheme provided by the embodiment of the invention can realize the purpose of accurately applying the pulse width setting voltage while simplifying the structure of the pulse width circuit.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel driving circuit, a display panel, a display device, and a pixel driving method.
Background
Pulse Width Modulation (PWM) driving circuits have been widely used in OLED displays to control the duration of the driving current of the pixel light emitting unit.
A Pulse Width Modulation (PWM) driving circuit in the related art includes an inverter having a gate connected to a driving transistor, and linearly changes to reach a predetermined threshold voltage in response to a pulse width setting voltage applied to an input terminal of the inverter, and a voltage of an output terminal of the inverter becomes a ground voltage or a driving voltage of a current source, thereby reaching a duration time for controlling a driving current.
However, the structure of the pulse width circuit based on the inverter in the related art is complicated and both the pulse width setting voltage and the linear conversion voltage need to be applied to the input terminal of the inverter by the switching action of the capacitor. With this arrangement, the voltage actually applied to the input terminal of the inverter differs from the pulse width setting voltage due to the influence of the capacitor ripple characteristic, resulting in poor stability in controlling the duration of the drive current and poor luminance uniformity.
Disclosure of Invention
The embodiment of the invention provides a pixel driving circuit, a display panel, display equipment and a pixel driving method, which can realize the purpose of accurately applying pulse width setting voltage while simplifying the structure of a pulse width circuit.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, including: the device comprises an amplitude setting module, a driving module, a pixel light-emitting unit, a switch module and a first capacitor; the amplitude setting module is used for transmitting the first data signal to the control end of the driving module; the driving module is used for generating driving current according to the potential of the control end of the driving module and the first level signal; the pixel light-emitting unit emits light according to the driving current; the switch module is used for transmitting a turn-off voltage to the control end of the driving module according to the electric potential of the control end of the switch module, the turn-off voltage enables the driving module to stop generating driving current, and the control end of the switch module is used for receiving a second data signal; the first capacitor comprises a first polar plate and a second polar plate, the first polar plate is electrically connected with the control end of the switch module, and the second polar plate is used for receiving a pulse width control signal; the second data signal and the pulse width control signal are commonly used for controlling the conduction duration of the switch module.
In one possible implementation of the first aspect, the switch module includes a first transistor, a gate of which is electrically connected to the first plate of the first capacitor.
In one possible implementation manner of the first aspect, the pixel driving circuit further includes a second data signal writing module, configured to transmit a second data signal to the gate of the first transistor; the second data signal writing module comprises a second transistor, wherein the first end of the second transistor is electrically connected with the second data signal input end, and the second end of the second transistor is electrically connected with the grid electrode of the first transistor.
In one possible implementation manner of the first aspect, the pixel driving circuit further includes a second data signal writing module, configured to transmit a second data signal to the gate of the first transistor; the second data signal writing module includes: a third transistor having a first terminal electrically connected to the second data signal input terminal and a second terminal electrically connected to the first terminal of the first transistor; and a first end of the fourth transistor is electrically connected with the second end of the first transistor, and a second end of the fourth transistor is electrically connected with the grid electrode of the first transistor.
The pulse width control signal of the pixel driving circuit is a voltage signal which changes linearly.
In one possible implementation manner of the first aspect, the pixel driving circuit further includes a pulse width control signal writing module for transmitting a pulse width control signal to the second plate of the first capacitor; the pulse width control signal writing module includes: and a fifth transistor having a first terminal electrically connected to the pulse width control signal input terminal and a second terminal electrically connected to the second plate of the first capacitor.
In one possible implementation manner of the first aspect, the pixel driving circuit further includes an off-voltage writing module, configured to transmit an off-voltage to the first terminal of the first transistor; the off-voltage writing module includes: and a first end of the sixth transistor is electrically connected with the turn-off voltage input end, and a second end of the sixth transistor is electrically connected with the first end of the first transistor.
In one possible implementation manner of the first aspect, the pixel driving circuit further includes an off-voltage transmission control module, configured to transmit an off-voltage to a control terminal of the driving module; the off-voltage transfer control module includes: and a first end of the seventh transistor is electrically connected with the second end of the first transistor, and a second end of the seventh transistor is electrically connected with the control end of the driving module.
In one possible implementation manner of the first aspect, the pixel driving circuit further includes a reset module, configured to transmit the reference voltage to the control terminal of the switch module; the reset module includes: and a first end of the eighth transistor is electrically connected with the reference voltage input end, and a second end of the eighth transistor is electrically connected with the grid electrode of the first transistor.
In one possible implementation of the first aspect, the driving module comprises: and the first end of the driving transistor is used for receiving a first level signal input by the first level signal input end, and the grid electrode of the driving transistor is the control end of the driving module.
In a second aspect, embodiments of the present invention provide a display panel including the pixel driving circuit provided in any of the embodiments of the present invention.
In a third aspect, embodiments of the present invention provide a display device, which includes the display panel provided in any embodiment of the present invention.
In a fourth aspect, embodiments of the present invention provide a pixel driving method, which can be used to drive the pixel driving circuit provided in any embodiment of the present invention. The driving method includes: the pulse width setting initial stage responds to the first scanning signal and transmits a second data signal to the control end of the switch module; a first data signal writing stage, responding to the second scanning signal, and transmitting the first data signal to the control end of the driving module; in the light-emitting stage, the pulse width control signal is transmitted to the second pole plate of the first capacitor, the switch module is switched on after a first time period since the second pole plate of the first capacitor receives the pulse width control signal, and transmits a switching-off voltage to the control end of the driving module, and the switching-off voltage enables the driving module to stop generating the driving current; the first duration is determined by the second data signal and the pulse width control signal.
In one possible implementation manner of the first aspect, before the pulse width setting initial stage, the pixel driving method further includes: and the reset phase is used for responding to the third scanning signal and transmitting the reference voltage to the control end of the switch module.
According to the technical scheme provided by the embodiment of the invention, the basic structure of the pulse width control circuit is formed by only adopting one switch module and the first capacitor, and the pulse width control circuit has the advantages of simple structure and stable performance. Based on above-mentioned circuit structure, when second data signal and pulse width control signal are used for controlling the switch-on duration of switch module jointly, the second data signal need not pass through the switching action of first condenser, can directly apply to the control end of switch module, therefore, the second data signal does not receive the undulant influence of the capacitance characteristic of first condenser, the voltage floating range and the signal complexity of pulse width control signal have been reduced, thereby can realize the purpose that the accurate pulse width that applys set up voltage, and then can improve the stability of the duration of control drive current, improve luminance homogeneity.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a pixel driving method according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the invention;
fig. 4 is a schematic diagram of a pulse width control signal sweet provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the invention;
fig. 6 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the invention;
FIG. 7 is a timing diagram of driving according to an embodiment of the present invention;
fig. 8 is a simulation result of the driving current of the pixel light emitting unit according to the embodiment of the invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to a first embodiment of the present invention.
The pixel driving circuit in this embodiment includes: an amplitude setting module 101, a driving module 102, a pixel light emitting unit 103, a switching module 104 and a first capacitor C1.
The amplitude setting module 101 is configured to transmit the first data signal D1 to a control terminal of the driving module 102. The driving module 102 is configured to generate a driving current according to a potential of a control terminal of the driving module 102 and the first level signal V1. The pixel light emitting unit 103 emits light according to the driving current. The switch module 104 is configured to transmit the off-voltage Voff to the control terminal of the driving module 102 according to a potential of the control terminal of the switch module 104, and the control terminal of the switch module 104 is configured to receive the second data signal D2. The first capacitor C1 includes a first plate electrically connected to the control terminal of the switch module 104 and a second plate for receiving the pulse width control signal Sweep.
In the pixel driving circuit shown in fig. 1, the second data signal D2 and the pulse width control signal sweet are used together to control the on-time of the switch module 104, and transmit the off-voltage Voff to the control terminal of the driving module 102 after the switch module 104 is turned on, so that the driving module 102 stops generating the driving current. Here, the second data signal D2 may also be understood as a pulse width setting voltage.
In this embodiment, only one switch module 104 and the first capacitor C1 are used to form the basic structure of the pulse width control circuit, which has the advantages of simple structure and stable performance. Based on above-mentioned circuit structure, when the second data signal is used for controlling the switch-on duration of switch module with the pulse width control signal jointly, second data signal D2 need not pass through the switching action of first condenser C1, can directly apply to the control end of switch module 104, therefore, the second data signal does not receive the undulant influence of the capacitive characteristic of first condenser, reduce the voltage floating range and the signal complexity of pulse width control signal, thereby can realize the purpose of accurate pulse width setting voltage of exerting, and then can improve the stability of the duration of control drive current, improve luminance homogeneity.
In the embodiment of the invention, the brightness of the light emitting unit of the pixel is influenced by the magnitude and the light emitting time of the driving current.
The embodiment of the invention also provides a pixel driving method which can be used for the pixel driving circuit in the figure 1. Referring to fig. 2, the pixel driving method includes:
in step 201, in response to the first scan signal, a second data signal D2 is transmitted to the control terminal of the switch module, which is also referred to as an initial pulse width setting stage.
In response to the second scan signal, step 202, a first data signal D1 is transmitted to the control terminal of the driving module, which is also referred to as a first data signal writing phase.
Step 203, the pulse width control signal sweet is transmitted to the second plate of the first capacitor C1, after the second plate of the first capacitor C1 receives the pulse width control signal sweet, the switch module 104 is turned on after a first time period, and transmits the off-voltage Voff to the control terminal of the driving module 102, where the off-voltage Voff causes the driving module 102 to stop generating the driving current, which is also referred to as a light-emitting phase.
In one possible implementation, the first data signal D1 may be kept unchanged during the display of different frames, and the second data signal D2 is the corresponding data signal of different frames to reflect the brightness of the pixels in different frames.
Fig. 3 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the invention.
In the present embodiment, the switch module 104 includes a first transistor T1, and a gate of the first transistor T1 is electrically connected to the first plate of the first capacitor C1. The gate of the first transistor T1 is the control terminal of the switch module 104. Here, the type of the first transistor T1 is not limited, and the first transistor T1 may be an N-type transistor or a P-type transistor.
Taking the first transistor T1 as an example of a P-type transistor, since the P-type transistor is turned on when the voltage difference between the gate and the source is less than the threshold voltage, which can also be understood as low level turn on, the pulse width signal sweet can be set to fall linearly (see fig. 4).
The operation of the first transistor T1 in fig. 3 is described below with reference to fig. 4:
since the gate of the first transistor T1 is connected to one plate of the first capacitor C1, when the pulse width signal sweet is inputted to the other plate of the first capacitor C1, the gate voltage of the first transistor T1 changes from the initial voltage with the same slope as the linear change slope of sweet until it is lower than the threshold voltage of the first transistor T1, the first transistor T1 is turned from a high-resistance state to be turned on, so that the off-voltage Voff is transmitted to the control terminal of the driving module 102 through the first transistor T1, and the driving module 102 stops outputting the driving current to the pixel light emitting unit 103 by the off-voltage Voff. As can be seen from the above process, the light emission period of the pixel light emitting unit 103 is determined by the second data signal D2 and the pulse width signal sweet.
When the first transistor T1 is an N-type transistor, since it is turned on when the voltage difference between the gate and the source of the N-type transistor is greater than the threshold voltage, it can also be understood as being turned on at a high level, and correspondingly, the pulse width signal sweet can be set to rise linearly.
In some embodiments, the pixel driving circuit further includes a second data signal writing module 105, and the second data signal writing module 105 is configured to transmit a second data signal D2 to the gate of the first transistor T1.
As shown in fig. 3, as an embodiment of the second data signal writing module 105, it specifically includes a second transistor T2, a first terminal of the second transistor T2 is electrically connected to the second data signal input terminal, and a second terminal of the second transistor T2 is electrically connected to the gate of the first transistor T1. Based on this embodiment, after the second transistor T2 is turned on, the second data signal D2 is applied to the gate of the first transistor T1.
Fig. 5 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the invention.
As shown in fig. 5, as another embodiment of the second data signal writing module 105, it specifically includes a third transistor T3 and a fourth transistor T4, in which for the third transistor T3, its first end is electrically connected to the second data signal input end, and its second end is electrically connected to the first end of the first transistor T1; for the fourth transistor T4, a first terminal thereof is electrically connected to the second terminal of the first transistor T1, and a second terminal thereof is electrically connected to the gate of the first transistor T1.
In order to distinguish from fig. 3, fig. 5 indicates that the second data signal writing module 105 is composed of two parts 105A and 105B, and according to this embodiment, after the third transistor T3 is turned on, the second data signal D2 is transmitted to the first end of the first transistor T1, and after the fourth transistor T4 is turned on synchronously, the second end of the first transistor T1 and the gate form a loop, the gate voltage of the first transistor T1 is D2+ Vth, and Vth is the threshold voltage of the first transistor T1.
It should be noted that the second data signal writing module 105 is not limited to the related embodiments shown in fig. 3 and 5, but the second data signal D2 can be applied to the gate of the first transistor T1 as precisely as possible.
In some embodiments, referring to fig. 5, the pixel driving circuit further comprises a pulse width control signal writing module 106 for transmitting a pulse width control signal sweet to the second plate of the first capacitor C1. The pulse width control signal writing module 106 specifically includes: a fifth transistor T5 has a first terminal electrically connected to the pulse width control signal input terminal and a second terminal electrically connected to the second plate of the first capacitor C1. Based on this embodiment, only after the fifth transistor T5 is turned on, the pulse width control signal sweet can be transmitted to the second plate of the first capacitor C1, which can be used to implement timing control of the pulse width control signal sweet.
In some embodiments, referring to fig. 5, the pixel driving circuit further includes an off-voltage writing module 107 for transmitting the off-voltage Voff to the first terminal of the first transistor T1. The off-voltage writing module 107 specifically includes: a first terminal of the sixth transistor T6 is electrically connected to the off-voltage input terminal, and a second terminal thereof is electrically connected to the first terminal of the first transistor T1. Based on this embodiment, the off-voltage Voff can be transferred to the first terminal of the first transistor T1 only after the sixth transistor T6 is turned on, and can be used to implement timing control of the off-voltage Voff.
In some embodiments, referring to fig. 5, the pixel driving circuit further includes an off-voltage transmission control module 108 for transmitting the off-voltage Voff to the control terminal of the driving module 102. The turn-off voltage transmission control module 108 specifically includes: a first end of the seventh transistor T7 is electrically connected to the second end of the first transistor T1, and a second end of the seventh transistor T7 is electrically connected to the control end of the driving module 102. Based on this embodiment, the off-voltage Voff can be transmitted to the control terminal of the driving module 102 only after the sixth transistor T6 and the seventh transistor T7 are all turned on, and therefore, the seventh transistor T7 can also be understood as whether the PWM pulse width control circuit intervenes in controlling the overall switch.
In some embodiments, referring to fig. 5, the pixel driving circuit further includes a reset module 109 for transmitting the reference voltage to the control terminal of the switch module 104. The reset module 109 includes: the eighth transistor T8 has a first terminal electrically connected to the reference voltage input terminal and a second terminal electrically connected to the gate of the first transistor T1. Based on this embodiment, the reference voltage Vref may be transmitted to the gate of the first transistor T1 before the light emitting stage of the current cycle ends or the pulse width setting stage of the next cycle starts to reset the voltage of the control terminal of the first transistor T1, thereby improving the accuracy of the pulse width control.
Based on the reset module in fig. 5, before the pulse width setting initial stage, the pixel driving method may further include a reset stage for transmitting the reference voltage Vref to the gate of the first transistor T1 in response to the third scan signal to reset the voltage of the gate of the first transistor T1, thereby improving the accuracy of the pulse width control.
Fig. 6 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the invention.
In this embodiment, the driving module specifically includes: the first terminal of the driving transistor Tq is configured to receive the first level signal V1 input from the first level signal input terminal, and the gate thereof is the control terminal of the driving module 102. The amplitude setting module 101 specifically includes a ninth transistor T9, a first terminal of which is connected to the first data signal input terminal, and a second terminal of which is connected to the gate of the driving transistor Tq. The pixel driving circuit further includes a second capacitor C2 having a first plate connected to the first level signal input terminal and a second plate connected to the gate of the driving transistor Tq. Based on this embodiment, after the ninth transistor T9 is turned on, the first data signal D1 may be transmitted to the second capacitor C2 via the ninth transistor T9 and stored in the second capacitor C2, the first data signal D1 is supplied to the gate of the driving transistor Tq through the second capacitor C2 so that the driving current in the driving transistor Tq is controlled, a current corresponding to the first data signal D1 is supplied to the pixel light emitting unit 103, and the pixel light emitting unit 103 emits light so that an image is displayed.
In some embodiments, referring to fig. 6, the pixel driving circuit further includes: a tenth transistor T10 has a first terminal connected to the second terminal of the driving transistor Tq and a second terminal connected to the anode of the pixel light emitting unit 103. Based on this embodiment, only after the tenth transistor T10 is turned on, the pixel light emitting unit 103 will have current flowing through it, and therefore, the tenth transistor T10 can also be understood as a light emission control switch of the pixel driving unit 103.
The operation of the pixel driving circuit will be described in detail below with reference to fig. 7 in which all the transistors in fig. 6 are P-type transistors, and the timing signals corresponding to one frame period are shown. One frame period shown in fig. 7 is composed of a scan signal input phase and a light emitting phase.
In the input stage of the scan signals (S1, S2, S3), the emission control signal EM is at a high level.
Wherein,
the S1 inputs a low level signal first, and in the period of inputting the low level signal in the S1, the eighth transistor T8 is turned on, and the reference voltage Vref is transmitted to the gate of the first transistor T1, and at this time, the gate voltage of the first transistor T1 is Vref, which plays a role of resetting the gate of the first transistor T1;
when the enable of S1 is over, a low level signal is input in S2, and a low level signal is input in S2, the third transistor T3 is turned on, the second data signal D2 is transmitted to the source of the first transistor T1, and the fourth transistor T4 is turned on synchronously, so that the drain and the gate of the first transistor T1 form a loop, and the gate voltage of the first transistor T1 becomes D2+ Vth;
the S2 enables to end the input of the low level signal S3, and turns on the ninth transistor T9 during the input of the low level signal S3, and transmits the first data signal D1 to the gate of the driving transistor Tq and stores it in the second capacitor C2, and the second capacitor C2 holds the potential of the gate of the driving transistor Tq.
When the enable of S3 is finished, the light emitting control signal EM inputs a low level signal, and the light emitting control signal EM inputs a low level signal, the tenth transistor T10 is turned on, and the driving transistor Tq flows through the pixel light emitting unit 103 to the second level signal terminal V2 according to the driving current formed by the first data signal D1 and the first level signal V1, so that the pixel light emitting unit 103 emits light; and turning on the seventh transistor T7, enabling the pulse width modulation function; and turning on the sixth transistor T6 to transmit the off-voltage Voff to the source of the first transistor T1. The pixel light emitting unit 103 may be an organic light emitting diode, or the pixel light emitting unit may be a micro inorganic light emitting diode.
Since the gate of the first transistor T1 is connected to one plate of the first capacitor C1, when the pulse width control signal sweet is inputted to the other plate of the first capacitor C1, the gate voltage of the first transistor T1 jumps from D2+ Vth to D2+ Vth + Va, then changes from D2+ Vth + Va with the same slope as the linear change slope of the pulse width control signal sweet until it is lower than Vth, the first transistor T1 is turned from a high-resistance state to on, so that the off-voltage Voff is transmitted to the gate of the driving transistor Tq via the first transistor T1, and the driving transistor Tq is turned from on to a high-resistance state by the off-voltage Voff, and the output of the driving current to the pixel light emitting unit 103 is stopped. As can be seen from the above process, the on-time of the driving transistor Tq is determined by the second data signal D2 and the pulse width control signal sweet together.
In the above voltage signals, Vref, Voff, V1, and V2 are all constant potentials. Here, V2< V1 indicates that the driving current flows from V1 to V2, and thus flows from the anode to the cathode of the pixel light-emitting unit 103, thereby causing the pixel light-emitting unit 103 to emit light.
With VGH and VGL as the corresponding potentials of the high level signal and the low level signal, the magnitudes of Vref and Voff are defined as follows:
VGL < Vref to put the first transistor T1 in a turned-on state when Vref is input to the gate of the first transistor T1.
V1< Voff < VGH to enable the driving transistor Tq to change from on to high-resistance state when Voff is input to the gate of the driving transistor Tq.
Referring to the simulation result of the driving current flowing through the pixel light emitting unit 103 in fig. 8, t1 is the turn-on duration of the driving transistor when D2 is 3V, t2 is the turn-on duration of the driving transistor when D2 is 4V, and t3 is the turn-on duration of the driving transistor when D2 is 3V, that is, in the case that the start voltage magnitude and the linear change slope of the pulse width control signal sweet are the same, the turn-on duration of the driving transistor Tq increases with the increase of the second data signal D2.
In this embodiment, the second data signal D2 is not converted by the first capacitor C1, but is directly applied to the gate of the first transistor T1 after the third transistor T3 and the fourth transistor T4 are turned on, so that the purpose of accurately applying the pulse width setting voltage can be achieved, and thus the stability of the driving current during the duration control can be improved, and the luminance uniformity can be improved.
The embodiment of the invention also provides a display panel which comprises the pixel driving circuit provided by any embodiment of the invention.
In addition, the embodiment of the invention also provides display equipment. The display device comprises the display panel provided by any embodiment of the invention. The display device can be a computer, a mobile phone, a tablet computer and the like.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the device embodiments, reference may be made to the description of the method embodiments in the relevant part. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions to, or change the order between the steps, after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of an embodiment of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
Embodiments of the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the embodiments of the present invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (13)
1. A pixel driving circuit, comprising: the device comprises an amplitude setting module, a driving module, a pixel light-emitting unit, a switch module and a first capacitor;
the amplitude setting module is used for transmitting a first data signal to the control end of the driving module;
the driving module is used for generating driving current according to the potential of the control end of the driving module and the first level signal;
the pixel light-emitting unit emits light according to the driving current;
the switch module is used for transmitting a turn-off voltage to the control end of the drive module according to the potential of the control end of the switch module, the turn-off voltage enables the drive module to stop generating a drive current, and the control end of the switch module is used for receiving a second data signal;
the first capacitor comprises a first polar plate and a second polar plate, the first polar plate is electrically connected with the control end of the switch module, and the second polar plate is used for receiving a pulse width control signal;
the second data signal and the pulse width control signal are used together for controlling the conduction time of the switch module, and the second data signal is directly applied to the control end of the switch module without the conversion action of the first capacitor;
the switching module includes a first transistor having a gate electrically connected to a first plate of the first capacitor.
2. The pixel driving circuit according to claim 1, further comprising a second data signal writing module configured to transmit the second data signal to the gate of the first transistor;
the second data signal writing module comprises a second transistor, wherein a first end of the second transistor is electrically connected with the second data signal input end, and a second end of the second transistor is electrically connected with a grid electrode of the first transistor.
3. The pixel driving circuit according to claim 1, further comprising a second data signal writing module configured to transmit the second data signal to the gate of the first transistor;
the second data signal writing module includes:
a third transistor having a first terminal electrically connected to the second data signal input terminal and a second terminal electrically connected to the first terminal of the first transistor;
and a fourth transistor, a first terminal of which is electrically connected to the second terminal of the first transistor, and a second terminal of which is electrically connected to the gate of the first transistor.
4. The pixel driving circuit according to claim 1, wherein the pulse width control signal is a linearly varying voltage signal.
5. The pixel driving circuit according to claim 1, further comprising a pulse width control signal writing module for transmitting the pulse width control signal to the second plate of the first capacitor;
the pulse width control signal writing module includes:
a fifth transistor having a first terminal electrically connected to the pulse width control signal input terminal and a second terminal electrically connected to the second plate of the first capacitor.
6. The pixel driving circuit according to claim 1, further comprising an off-voltage writing module for transmitting the off-voltage to the first terminal of the first transistor;
the off-voltage writing module includes:
and a sixth transistor, a first end of which is electrically connected with the off-voltage input end, and a second end of which is electrically connected with the first end of the first transistor.
7. The pixel driving circuit according to claim 6, further comprising an off-voltage transmission control module for transmitting the off-voltage to a control terminal of the driving module;
the turn-off voltage transfer control module includes:
and a first end of the seventh transistor is electrically connected with the second end of the first transistor, and a second end of the seventh transistor is electrically connected with the control end of the driving module.
8. The pixel driving circuit according to claim 1, further comprising a reset module for transmitting a reference voltage to the control terminal of the switch module;
the reset module includes:
and a first end of the eighth transistor is electrically connected with the reference voltage input end, and a second end of the eighth transistor is electrically connected with the grid electrode of the first transistor.
9. The pixel driving circuit according to claim 1, wherein the driving module comprises:
and the first end of the driving transistor is used for receiving the first level signal input by the first level signal input end, and the grid electrode of the driving transistor is the control end of the driving module.
10. A display panel comprising the pixel drive circuit according to any one of claims 1 to 9.
11. A display device characterized by comprising the display panel according to claim 10.
12. A pixel driving method for driving the pixel driving circuit according to claim 1, comprising:
the pulse width setting initial stage responds to the first scanning signal and transmits a second data signal to the control end of the switch module;
a first data signal writing stage, responding to the second scanning signal, and transmitting the first data signal to the control end of the driving module;
in the light-emitting stage, a pulse width control signal is transmitted to a second pole plate of a first capacitor, and after the second pole plate of the first capacitor receives the pulse width control signal, the switch module is turned on after a first time period and transmits a turn-off voltage to a control end of the driving module, wherein the turn-off voltage enables the driving module to stop generating a driving current;
wherein the first duration is determined by the second data signal and the pulse width control signal.
13. The pixel driving method according to claim 12, wherein before the pulse width setting initial stage, the pixel driving method further comprises:
and the reset phase is used for responding to a third scanning signal and transmitting the reference voltage to the control end of the switch module.
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| CN111477165A (en) * | 2020-05-13 | 2020-07-31 | 深圳市华星光电半导体显示技术有限公司 | Display device and driving method thereof |
| CN111462685B (en) * | 2020-05-29 | 2021-08-31 | 上海天马有机发光显示技术有限公司 | Pixel driving circuit and driving method thereof, display panel and display device |
| TWI722955B (en) * | 2020-08-17 | 2021-03-21 | 友達光電股份有限公司 | Pixel driving device and method for driving pixel |
| CN112365843B (en) * | 2020-12-09 | 2022-02-08 | 武汉天马微电子有限公司 | Pixel driving circuit and driving method thereof, display panel and device |
| CN114783353B (en) * | 2021-01-22 | 2025-02-18 | 中国科学院微电子研究所 | A μLED unit light-emitting circuit, light-emitting control method thereof and display device |
| CN114783352B (en) * | 2021-01-22 | 2025-02-18 | 中国科学院微电子研究所 | A μLED unit circuit, light emitting control method and pixel device |
| CN112927651B (en) * | 2021-02-05 | 2022-05-24 | 华南理工大学 | A pixel driving circuit, active electroluminescence display and driving method |
| CN113380182B (en) * | 2021-04-21 | 2022-05-03 | 电子科技大学 | A gate-controlled MOS light-emitting LED pixel drive circuit |
| CN113707079B (en) * | 2021-09-09 | 2023-03-28 | 武汉华星光电半导体显示技术有限公司 | Pixel circuit and display panel |
| US11783760B2 (en) | 2021-09-09 | 2023-10-10 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Pixel circuit and display panel |
| CN114170956A (en) * | 2021-12-09 | 2022-03-11 | 湖北长江新型显示产业创新中心有限公司 | Pixel driving circuit and driving method thereof, display panel and display device |
| CN114708827A (en) * | 2022-04-27 | 2022-07-05 | Tcl华星光电技术有限公司 | Driving circuit, display panel and driving method thereof |
| TWI805373B (en) * | 2022-05-18 | 2023-06-11 | 友達光電股份有限公司 | Pixel circuit |
| CN115985249A (en) * | 2022-05-30 | 2023-04-18 | 成都辰显光电有限公司 | Pixel circuit, driving method thereof, and display device |
| WO2024193167A1 (en) * | 2023-03-21 | 2024-09-26 | 海信视像科技股份有限公司 | Micro led driving circuit |
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| EP3389037B1 (en) * | 2017-04-11 | 2020-12-09 | Samsung Electronics Co., Ltd. | Pixel circuit of display panel |
| EP3389039A1 (en) * | 2017-04-13 | 2018-10-17 | Samsung Electronics Co., Ltd. | Display panel and driving method of display panel |
| CN110556072B (en) * | 2018-05-31 | 2024-07-02 | 三星电子株式会社 | Display panel and method for driving the same |
| CN109859682B (en) * | 2019-03-28 | 2021-01-22 | 京东方科技集团股份有限公司 | Driving circuit, driving method thereof and display device |
| CN110010057B (en) * | 2019-04-25 | 2021-01-22 | 京东方科技集团股份有限公司 | Pixel driving circuit, pixel driving method and display device |
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