CN109308878A - Pixel circuit and its driving method, display device - Google Patents
Pixel circuit and its driving method, display device Download PDFInfo
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- CN109308878A CN109308878A CN201811158627.4A CN201811158627A CN109308878A CN 109308878 A CN109308878 A CN 109308878A CN 201811158627 A CN201811158627 A CN 201811158627A CN 109308878 A CN109308878 A CN 109308878A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3266—Details of drivers for scan electrodes
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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]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
Abstract
The disclosure is directed to a kind of pixel circuit and its driving methods, display device, including the pixel circuit includes luminescence unit, driving transistor, first switch unit, first energy-storage units and partial pressure unit；Transistor first end is driven to connect the first power supply signal, second end is connected to the first end of the luminescence unit, and the second end of the luminescence unit connects second source signal；The first switch unit is connected in response to scanning signal, by data signal transmission to the control terminal of the driving transistor；First energy-storage units first end is connected to the control terminal of the driving transistor, and second end connects the first power supply signal；The partial pressure unit responds the scanning signal and is connected, to change the voltage at the driving transistor driving end by first power supply signal.Increase the driving dynamic range of pixel circuit, improves control chip to the control precision of OLED screen curtain brightness.
Description
Technical field
This disclosure relates to which field of display technology, fills in particular to a kind of pixel circuit and its driving method, display
It sets.
Background technique
It is usually logical in OLED (Organic Light Emitting Diode, Organic Light Emitting Diode) pixel circuit
Overcurrent drives transistor to shine to control luminescence unit, and the light emission luminance of luminescence unit is determined by driving current.Scan crystal
The control terminal of ordered pair driving transistor carries out data voltage Vdata charging when pipe is to preset, by controlling the size of Vdata, i.e.,
Controllable driving current.Driving dynamic range can be defined as the difference of Vdata maximum voltage value and Vdata minimum amount of voltage that.
Dynamic range is driven to determine the maximum gray adjustable range and minimum gray adjustable precision of OLED screen curtain, driving
Dynamic range is smaller to be more unfavorable for controlling accurate control of the chip to OLED brightness.The pixel density of OLED screen curtain constantly increases at present
Greatly, the voltage range that the increase of pixel density will lead to that transistor controls end can load reduces, in order to guarantee to drive transistor
Normal work, need to adjust driving dynamic range reduce.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
The disclosure is designed to provide a kind of pixel circuit and its driving method, display device, solves in the related technology
The limitation of the range for the voltage that pixel circuit can be loaded by driving transistor, caused driving dynamic range is lesser to ask
Topic.
According to the disclosure in a first aspect, providing a kind of pixel circuit, the pixel circuit includes:
Luminescence unit；
Transistor is driven, first end connects the first power supply signal, and second end is connected to the first of the luminescence unit
The second end at end, the luminescence unit connects second source signal；
First switch unit, the first switch unit is connected in response to scanning signal, by data signal transmission to institute
State the control terminal of driving transistor；
First energy-storage units, first end are connected to the control terminal of the driving transistor, the first electricity of second end connection
Source signal；
Partial pressure unit, the partial pressure unit responds the scanning signal and is connected, to be changed by first power supply signal
Become the voltage at the driving transistor driving end.
According to an embodiment of the disclosure, the first switch unit includes:
The first transistor, first end connect data-signal, and second end is connected to the control terminal of the driving transistor,
Control terminal receives the scanning signal；
The partial pressure unit includes:
Second transistor, first end are connected to the second end of the first transistor, second end connection described first
Power supply signal, control terminal receive the scanning signal.
According to an embodiment of the disclosure, the pixel circuit further include:
Third transistor is connected between driving transistor and the first power supply signal, the first end of the third transistor
Connecting first power supply signal, the second end of the third transistor connects the first end of the driving transistor, and described the
The control terminal of three transistors is for receiving LED control signal.
According to an embodiment of the disclosure, the first switch unit includes:
The first transistor, first end connect data-signal, and second end is connected to the control terminal of the driving transistor,
Control terminal receives the scanning signal；
The partial pressure unit includes:
4th transistor, first end are connected to the control terminal of the driving transistor, and control terminal is for receiving first
Scanning signal；
5th transistor, first end are connected to the second end of the 4th transistor, and second end connects the first power supply
Signal, control terminal is for receiving the second scanning signal；
Second energy-storage units, first end are connected to the first end of the first energy-storage units, and second end is connected to institute
State the second end of the 4th transistor.
According to an embodiment of the disclosure, the pixel circuit further include:
6th transistor is connected between driving transistor and the first power supply signal, the first end of the 6th transistor
Connecting first power supply signal, the second end of the 6th transistor connects the first end of the driving transistor, and described the
The control terminal of six transistors is for receiving LED control signal.
According to an embodiment of the disclosure, all transistors are N-type TFT or all crystalline substances
Body pipe is P-type TFT；
When all transistors are N-type TFT, first power supply signal is high level signal, described
Second source signal is low level signal, and the first end of the luminescence unit is the anode of Organic Light Emitting Diode, described to shine
The second end of unit is the cathode of the Organic Light Emitting Diode.
When all transistors are P-type TFT, first power supply signal is low level signal, described
Second source signal is high level signal, and the first end of the luminescence unit is the cathode of Organic Light Emitting Diode, described to shine
The second end of unit is the anode of the Organic Light Emitting Diode.
According to the second aspect of the disclosure, a kind of image element driving method is provided, for driving above-mentioned pixel circuit；It is described
Image element driving method includes:
First switch unit and partial pressure unit is connected using scanning signal, to control the voltage at driving transistor controls end,
By the first end of the voltage write-in first energy-storage units at the driving transistor controls end, by the first power supply signal write-in described the
The second end of one energy-storage units；
The first switch unit and the partial pressure unit are turned off using the scanning signal, by the energy-storage units
Voltage signal the driving transistor is connected, make the first power supply signal that the luminescence unit be driven to shine.
According to an embodiment of the disclosure, the first switch unit includes the first transistor, the partial pressure unit packet
Second transistor is included, the image element driving method includes:
The first transistor and second transistor is connected using scanning signal, to control the voltage at driving transistor controls end,
By the first end of the voltage write-in first energy-storage units at the driving transistor controls end, by the first power supply signal write-in described the
The second end of one energy-storage units；
The first transistor and the second transistor are turned off using the scanning signal, by the energy-storage units
Voltage signal the driving transistor is connected, make the first power supply signal that the luminescence unit be driven to shine.
According to an embodiment of the disclosure, the first switch unit includes the first transistor, the partial pressure unit packet
The 4th transistor, the 5th transistor and second energy-storage units are included, the image element driving method includes:
The first transistor and the 4th transistor is connected using the first scanning signal and the second scanning signal and closes
Break the 5th transistor, by the first end of voltage data signal write-in first energy-storage units, by first power supply
The second end of signal write-in first energy-storage units；
The 5th transistor is connected using first scanning signal and second scanning signal and turns off first crystalline substance
First power supply signal, is written the second end of the second energy-storage units by body pipe and the 4th transistor；
The first transistor, the 4th crystal are turned off using first scanning signal and second scanning signal
The driving is connected by the voltage signal in the first energy-storage units lattice second energy-storage units in pipe and the 5th transistor
Transistor makes the first power supply signal that the luminescence unit be driven to shine.
According to the third aspect of the disclosure, a kind of display device is provided, including above-mentioned pixel circuit.
Pixel circuit provided by disclosure illustrative embodiments and its driving method, display device, can be used for increasing
Drive dynamic range.The pixel circuit includes luminescence unit, driving transistor, first switch unit, partial pressure unit and energy storage list
Member；In the pixel circuit work process, by partial pressure unit, the first power supply signal is transmitted to the control of driving transistor
End, to change the voltage at driving transistor controls end, the parameter by adjusting partial pressure unit can adjust reduction driving transistor
The voltage range of control terminal, and then can guarantee the electricity of the control terminal of driving transistor in the case where increasing and driving dynamic range
Pressure range meets job requirement, increases the driving dynamic range of pixel circuit, improves control chip to OLED screen curtain brightness
Control precision.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The disclosure can be limited.
Detailed description of the invention
Its example embodiment is described in detail by referring to accompanying drawing, the above and other feature and advantage of the disclosure will become
It is more obvious.
Fig. 1 is a kind of circuit diagram for pixel circuit that the relevant technologies provide；
Fig. 2 is the circuit diagram for the first pixel circuit that disclosure illustrative embodiments provide；
Fig. 3 is the circuit diagram for second of pixel circuit that disclosure illustrative embodiments provide；
Fig. 4 is the charging simulation comparison diagram of pixel circuit shown in pixel circuit shown in Fig. 1 and Fig. 2；
Fig. 5 is the circuit diagram for the third pixel circuit that disclosure illustrative embodiments provide；
Fig. 6 is the circuit diagram for the 4th kind of pixel circuit that disclosure illustrative embodiments provide；
Fig. 7 is the driver' s timing figure of pixel circuit shown in Fig. 5；
Fig. 8 is the charging simulation comparison diagram of pixel circuit shown in pixel circuit shown in Fig. 1 and Fig. 5；
Fig. 9 is a kind of flow chart for pixel circuit drive method that disclosure illustrative embodiments provide.
In figure:
T1, the first transistor；T2, second transistor；T3, third transistor；T4, the 4th transistor；T5, the 5th crystal
Pipe；T6, the 6th transistor；DT, driving transistor；OLED, Organic Light Emitting Diode；VDD, the first power supply signal；VSS, second
Power supply signal；Gn, scanning signal；EM, LED control signal；Vdata, data-signal.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to example set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will more
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.Described feature, knot
Structure or characteristic can be incorporated in any suitable manner in one or more embodiments.In the following description, it provides perhaps
More details fully understand embodiment of the present disclosure to provide.It will be appreciated, however, by one skilled in the art that can
It is omitted with technical solution of the disclosure one or more in the specific detail, or others side can be used
Method, constituent element, device, step etc..In other cases, be not shown in detail or describe known solution to avoid a presumptuous guest usurps the role of the host and
So that all aspects of this disclosure thicken.
In addition, attached drawing is only the schematic illustrations of the disclosure, it is not necessarily drawn to scale.Identical attached drawing mark in figure
Note indicates same or similar part, thus will omit repetition thereof.Some block diagrams shown in the drawings are function
Energy entity, not necessarily must be corresponding with physically or logically independent entity.These function can be realized using software form
Energy entity, or these functional entitys are realized in one or more hardware modules or integrated circuit, or at heterogeneous networks and/or place
These functional entitys are realized in reason device device and/or microcontroller device.
2T1C pixel circuit in the related technology is as shown in Figure 1, drive the voltage range of transistor DT control terminal by driving
Dynamic range is determined, since the voltage range that driving transistor DT driving end can carry is limited, is limited and is actually answered
The size of driving dynamic range in.And in the OLED display of the high pixel densities such as VR/MR, need to increase driving dynamic
Range, to improve the control precision of OLED brightness.
A kind of pixel circuit is provided in this example embodiment, as shown in Fig. 2, the pixel circuit include: luminescence unit,
Drive transistor DT, first switch unit, first energy-storage units and partial pressure unit；
Transistor DT first end is driven to connect the first power supply signal VDD, second end is connected to the first of the luminescence unit
The second end at end, the luminescence unit connects second source signal VSS；
First switch unit is connected in response to scanning signal, and data-signal Vdata is transmitted to the driving transistor
The control terminal of DT；
First energy-storage units first end is connected to the control terminal of the driving transistor DT, and second end connects the first power supply letter
Number VDD；
Partial pressure unit responds the scanning signal and is connected, to change the driving by the first power supply signal VDD
The voltage at transistor DT driving end.
Pixel circuit provided by disclosure illustrative embodiments can be used for increasing driving dynamic range.Pixel electricity
Road includes luminescence unit, driving transistor DT, first switch unit, partial pressure unit and energy-storage units；It works in the pixel circuit
In engineering, by partial pressure unit, the first power supply signal VDD is transmitted to the control terminal of driving transistor DT, it is brilliant to change driving
The voltage of body pipe DT control terminal, the parameter by adjusting partial pressure unit can adjust the voltage for reducing driving transistor DT control terminal
Range, and then can guarantee to drive the voltage range symbol of the control terminal of transistor DT in the case where the driving dynamic range of increase
Job requirement is closed, the driving dynamic range of pixel circuit is increased, improves control chip to the control precision of OLED screen curtain brightness.
In the disclosure one in feasible embodiment, the first switch unit as shown in Figure 2 includes: the first transistor
T1, first end connect data-signal Vdata, and second end is connected to the control terminal of the driving transistor DT, control termination
Receive the scanning signal；
Partial pressure unit includes: second transistor T2, and first end is connected to the second end of the first transistor T1,
Second end connects the first power supply signal VDD, and control terminal receives the scanning signal.
On this basis, as shown in figure 3, the pixel circuit that the embodiment of the present disclosure provides further include: third transistor T3, even
It is connected between driving transistor DT and the first power supply signal VDD, the first end connection of the third transistor T3 first electricity
Source signal VDD, the second end of the third transistor T3 connect the first end of the driving transistor DT, the third transistor
The control terminal of T3 is for receiving LED control signal EM.
The course of work of pixel circuit shown in Fig. 2 is described in detail below.It can be p-type with all transistors
It is illustrated for thin film transistor (TFT), the driving voltage of each transistor is low level voltage；In the case, first electricity
Source signal VDD can be low level signal, and the second source signal VSS can be high level signal, the luminescence unit
First end is the cathode of OLED, and the second end of the luminescence unit is the anode of OLED.
When scanning signal Gn is low level, the first transistor T1 and second transistor T2 conducting, the first transistor T1's
Opening resistor is RT1, and the opening resistor of second transistor T2 is that RT2, RT1 and RT2 are connected between Vdata and VDD, is controlled
The voltage Vg of the control terminal of transistor is calculated by formula (1):
As shown in formula (1), it can be controlled by adjusting the W/L and quantity of the first transistor T1 and second transistor T2
RT1 and RT2, so that the voltage at driving transistor DT driving end is controlled, to increase the driving dynamic of driving transistor DT control terminal
Range.
Such as, it can be assumed that the W/L of the first transistor T1 and second transistor T2 are equal, and channel is evenly distributed, RT1 and
RT2 is identical, and formula (1) is deformed into formula (2) at this time:
With VDD=5V, for Vdata=3V~5V, driving dynamic range at this time is 2V, Vg=4V~5V, drives crystal
The voltage range of pipe DT control terminal is 1V.Thus, driving transistor DT driving voltage reference terminal be Vg=4V~5V not
In the case where change, corresponding Vdata is 4V~5V in the related technology, and driving dynamic range is 1V, is corresponded in the embodiment of the present disclosure
Vdata be 3V~5V, therefore by the embodiment of the present disclosure provide pixel circuit, be able to ascend driving dynamic range.In reality
During border is used, scaling ratio can be controlled by W/L and the quantity etc. for adjusting the first transistor T1 and second transistor T2.
Fig. 4 shows a kind of pixel electricity for a kind of pixel circuit and the offer of disclosure embodiment that the relevant technologies provide
Road analog charge comparison diagram, wherein Vdata=3V~4V, VDD=5V, Vg '=3.1V~4.1V, the disclosure mention in the related technology
Vg=4.2V~4.6V in the pixel circuit of confession.
When pixel circuit further includes third transistor T3, when driving transistor DT conducting, pass through LED control signal
EM controls third transistor T3 conducting, and electric current flows through luminescence unit, and driving luminescence unit shines.
In another feasible embodiment of the disclosure, as shown in figure 5, the first switch unit includes: the first crystalline substance
Body pipe T1, first end connect data-signal Vdata, and second end is connected to the control terminal of the driving transistor DT, control
End receives the scanning signal；
The partial pressure unit includes: the 4th transistor T4, and first end is connected to the control terminal of the driving transistor DT,
Its control terminal is for receiving the first scanning signal；5th transistor T5, first end are connected to the of the 4th transistor T4
Two ends, second end connect the first power supply signal VDD, and control terminal is for receiving the second scanning signal；Second energy-storage units,
First end is connected to the first end of the first energy-storage units, and second end is connected to the second end of the 4th transistor T4.
On this basis, as shown in fig. 6, the pixel circuit that the embodiment of the present disclosure provides further include: the 6th transistor T6, even
It is connected between driving transistor DT and the first power supply signal VDD, the first end connection of the 6th transistor T6 first electricity
Source signal VDD, the second end of the 6th transistor T6 connect the first end of the driving transistor DT, the 6th transistor
The control terminal of T6 is for receiving LED control signal EM.
It is described in detail below according to the course of work of the timing diagram shown in Fig. 7 to pixel circuit shown in fig. 5.This when
Sequence shows the first scanning signal Gn and the second scanning signal Gn+1 in the level state of three periods.With all transistors
It can be for P-type TFT, the driving voltage of each transistor is low level voltage；In the case, described
One power supply signal VDD can be low level signal, and the second source signal VSS can be high level signal, the luminous member
The first end of part is the cathode of OLED, and the second end of the light-emitting component is the anode of OLED.
First period the t1: the first scanning signal Gn is low level, and the second scanning signal Gn+1 is high level, the first transistor
Vdata, is charged to the control terminal G and the of driving transistor DT by T1 and the 4th transistor T4 conducting and the 5th transistor T5 is turned off
The second end Q of two energy-storage travelling wave tubes.
Second period the t2: the first scanning signal Gn is high level, and the second scanning signal Gn+1 is low level, the first transistor
T1 and the 4th transistor T4 shutdown and the 5th transistor T5 conducting, are pulled to VDD for the voltage of the second energy-storage travelling wave tube second end,
During this, driving transistor DT driving end is coupled through the first energy-storage travelling wave tube and the second energy-storage travelling wave tube, causes driving brilliant
Body pipe DT driving end G current potential changes.Wherein, the first energy-storage travelling wave tube and the second energy-storage travelling wave tube can be capacitor, and first
The capacitor of energy-storage travelling wave tube is Cst1, and the capacitor of the second energy-storage travelling wave tube is Cst2.In the second energy-storage travelling wave tube second end voltage change mistake
Cheng Zhong, shown in driving transistor DT control terminal voltage variety such as formula (3):
Finally, shown in the voltage such as formula (4) for driving transistor DT control terminal:
For example, formula (4) is deformed into formula (5) as Cst1=Cst2:
With VDD=5V, for Vdata=3V~5V, driving dynamic range at this time is 2V, Vg=4V~5V, drives crystal
The voltage range of pipe DT control terminal is 1V.Thus, driving transistor DT driving voltage reference terminal be Vg=4V~5V not
In the case where change, corresponding Vdata is 4V~5V in the related technology, and driving dynamic range is 1V, is corresponded in the embodiment of the present disclosure
Vdata be 3V~5V, therefore by the embodiment of the present disclosure provide pixel circuit, be able to ascend driving dynamic range.In reality
During border is used, scaling ratio can be controlled by capacitor and the quantity etc. for adjusting the first energy-storage travelling wave tube and the second energy-storage travelling wave tube.
Third period t3: the first scanning signal Gn and the second scanning signal Gn+1 shutdown described first is utilized
Transistor T1, the 4th transistor T4 and the 5th transistor T5 pass through the second energy storage of first energy-storage units lattice list
The driving transistor DT is connected in voltage signal in member, makes the first power supply signal VDD that the luminescence unit be driven to shine.
Fig. 8 shows a kind of pixel electricity for a kind of pixel circuit and the offer of disclosure embodiment that the relevant technologies provide
Road analog charge comparison diagram, wherein Vdata=3V~4V, VDD=5V, Vg '=3.1V~4.1V, the disclosure mention in the related technology
Vg=4.2V~4.6V in the pixel circuit of confession.
When pixel circuit further includes the 6th transistor T6, in the above-mentioned third period, LED control signal EM is low level,
6th transistor T6 conducting, electric current flow through luminescence unit, and driving luminescence unit shines.
In this example embodiment, each transistor all has a control terminal, first end and second end.Specifically, each
It can be source electrode, second end can be drain electrode that the control terminal of a transistor, which can be grid, first end,；Alternatively, each transistor
Control terminal can be grid, first end can be drain electrode, second end can be source electrode.In addition, each transistor can also be
Enhancement transistor or depletion mode transistor, this example embodiment are not especially limited this.
On this basis, all transistors can be N-type TFT, and the driving voltage of each transistor is high electricity
Ordinary telegram pressure；In the case, the first power supply signal VDD can be high level signal, and the second source signal VSS can be with
For low level signal, the first end of the light-emitting component is the anode of OLED, and the second end of the light-emitting component is the yin of OLED
Pole.
Alternatively, all transistors can be P-type TFT, the driving voltage of each transistor is low level electricity
Pressure；In the case, the first power supply signal VDD can be low level signal, and the second source signal VSS can be height
Level signal, the first end of the light-emitting component are the cathode of OLED, and the second end of the light-emitting component is the anode of OLED.
It should be noted that all transistors are P-type transistor in above-mentioned specific embodiment, first is electric at this time
Source signal VDD is low level signal, and the cathode of OLED is connect with driving transistor DT, and the anode and high level signal of OLED connects
It connects.It is had the advantage that using full P-type TFT for example strong to noise suppressed power；Such as due to being low level conducting, and
Low level is easy to accomplish in Charge Management；Such as P-type TFT processing procedure is simple, relative price is lower；Such as p-type film is brilliant
The stability of body pipe is more preferable etc..But those skilled in the art are easy the pixel circuit according to provided by the disclosure and obtain all crystalline substances
Body pipe is the pixel-driving circuit of N-type transistor.Certainly, pixel-driving circuit provided by the disclosure is also readily modified as CMOS
(Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor) circuit etc., does not limit to
Provided pixel circuit in this present embodiment, which is not described herein again.
This example embodiment also provides a kind of image element driving method, for driving above-mentioned pixel circuit；Such as Fig. 9 institute
Show, which includes:
First switch unit and partial pressure unit is connected using scanning signal, to control driving transistor controls in step S100
The voltage at end, by the first end of the voltage write-in first energy-storage units at the driving transistor controls end, by the first power supply signal
The second end of the first energy-storage units is written；
Step S200 turns off the first switch unit and the partial pressure unit using the scanning signal, by described
The driving transistor is connected in voltage signal in energy-storage units, makes the first power supply signal that the luminescence unit be driven to shine.
Optionally, when the first switch unit includes the first transistor T1, the partial pressure unit includes second transistor
When T2, the image element driving method includes:
The first transistor T1 and second transistor T2 is connected using scanning signal, to control driving transistor in step S110
The voltage of DT control terminal, by the first end of the voltage write-in first energy-storage units of the driving transistor DT control terminal, by first
Power supply signal VDD write enters the second end of the first energy-storage units；
Step S210 turns off the first transistor T1 and second transistor T2 using the scanning signal, passes through
The driving transistor DT is connected in voltage signal in the energy-storage units, and the first power supply signal VDD is made to drive the luminous list
Member shines.
Optionally, when the first switch unit includes the first transistor T1, the partial pressure unit includes the 4th transistor
T4, the 5th transistor T5 and second energy-storage units, the image element driving method include:
The first transistor T1 and described the is connected using the first scanning signal and the second scanning signal in step S120
Four transistor T4 simultaneously turn off the 5th transistor T5, by data-signal Vdata voltage write-in first energy-storage units
The first power supply signal VDD write is entered the second end of first energy-storage units by first end；
Step S130 is connected the 5th transistor T5 using first scanning signal and second scanning signal and turns off
The first power supply signal VDD write is entered the second energy storage list by the first transistor T1 and the 4th transistor T4
The second end of member；
Step S220, using first scanning signal and second scanning signal turn off the first transistor T1,
The 4th transistor T4 and the 5th transistor T5 passes through the voltage in the first energy-storage units lattice second energy-storage units
Transistor DT is driven described in signal conduction, makes the first power supply signal VDD that the luminescence unit be driven to shine.
It should be noted that although describing each step of method in the disclosure in the accompanying drawings with particular order,
This does not require that or implies must execute these steps in this particular order, or have to carry out step shown in whole
Just it is able to achieve desired result.Additional or alternative, it is convenient to omit multiple steps are merged into a step and held by certain steps
Row, and/or a step is decomposed into execution of multiple steps etc..
Also a kind of display device of this example embodiment, including above-mentioned pixel circuit.The display device includes: a plurality of sweeps
Line is retouched, for providing scanning signal；Multiple data lines, for providing data-signal Vdata；Multiple pixel circuits, are electrically connected to
Above-mentioned scan line and data line；The pixel circuit of at least one of them includes for any of the above-described picture in this example embodiment
Plain driving circuit.Wherein, the display device for example may include mobile phone, tablet computer, television set, laptop, number
Any products or components having a display function such as photo frame, navigator.
It should be understood that the detail of each modular unit is in corresponding pixel driver electricity in the display device
It is described in detail in road, therefore which is not described herein again.
It should be noted that although being referred to several modules or list for acting the equipment executed in the above detailed description
Member, but this division is not enforceable.In fact, according to embodiment of the present disclosure, it is above-described two or more
Module or the feature and function of unit can embody in a module or unit.Conversely, an above-described mould
The feature and function of block or unit can be to be embodied by multiple modules or unit with further division.
In addition, although describing each step of method in the disclosure in the accompanying drawings with particular order, this does not really want
These steps must be executed in this particular order by asking or implying, or having to carry out step shown in whole could realize
Desired result.Additional or alternative, it is convenient to omit multiple steps are merged into a step and executed by certain steps, and/
Or a step is decomposed into execution of multiple steps etc..
Through the above description of the embodiments, those skilled in the art is it can be readily appreciated that example described herein is implemented
Mode can also be realized by software realization in such a way that software is in conjunction with necessary hardware.Therefore, according to the disclosure
The technical solution of embodiment can be embodied in the form of software products, which can store non-volatile at one
Property storage medium (can be CD-ROM, USB flash disk, mobile hard disk etc.) in or network on, including some instructions are so that a calculating
Equipment (can be personal computer, server, mobile terminal or network equipment etc.) is executed according to disclosure embodiment
Method.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by appended
Claim is pointed out.
Claims (10)
1. a kind of pixel circuit, which is characterized in that the pixel circuit includes:
Luminescence unit；
Transistor is driven, first end connects the first power supply signal, and second end is connected to the first end of the luminescence unit, institute
State the second end connection second source signal of luminescence unit；
First switch unit, the first switch unit are connected in response to scanning signal, by data signal transmission to the drive
The control terminal of dynamic transistor；
First energy-storage units, first end are connected to the control terminal of the driving transistor, and second end connects the first power supply letter
Number；
Partial pressure unit, the partial pressure unit respond the scanning signal and are connected, to change institute by first power supply signal
State the voltage at driving transistor driving end.
2. pixel circuit as described in claim 1, which is characterized in that the first switch unit includes:
The first transistor, first end connect data-signal, and second end is connected to the control terminal of the driving transistor, control
End receives the scanning signal；
The partial pressure unit includes:
Second transistor, first end are connected to the second end of the first transistor, and second end connects first power supply
Signal, control terminal receive the scanning signal.
3. pixel circuit as claimed in claim 2, which is characterized in that the pixel circuit further include:
Third transistor is connected between driving transistor and the first power supply signal, and the first end of the third transistor connects
First power supply signal, the second end of the third transistor connect the first end of the driving transistor, and the third is brilliant
The control terminal of body pipe is for receiving LED control signal.
4. pixel circuit as described in claim 1, which is characterized in that the first switch unit includes:
The first transistor, first end connect data-signal, and second end is connected to the control terminal of the driving transistor, control
End receives the scanning signal；
The partial pressure unit includes:
4th transistor, first end are connected to the control terminal of the driving transistor, and control terminal is for receiving the first scanning
Signal；
5th transistor, first end are connected to the second end of the 4th transistor, and second end connects the first power supply signal,
Its control terminal is for receiving the second scanning signal；
Second energy-storage units, first end are connected to the first end of the first energy-storage units, and second end is connected to described
The second end of four transistors.
5. pixel circuit as claimed in claim 4, which is characterized in that the pixel circuit further include:
6th transistor is connected between driving transistor and the first power supply signal, and the first end of the 6th transistor connects
First power supply signal, the second end of the 6th transistor connect the first end of the driving transistor, and the described 6th is brilliant
The control terminal of body pipe is for receiving LED control signal.
6. pixel circuit as claimed in claim 1 to 5, which is characterized in that all transistors are that N-type film is brilliant
Body pipe or all transistors are P-type TFT；
When all transistors are N-type TFT, first power supply signal be high level signal, described second
Power supply signal is low level signal, and the first end of the luminescence unit is the anode of Organic Light Emitting Diode, the luminescence unit
Second end be the Organic Light Emitting Diode cathode；
When all transistors are P-type TFT, first power supply signal be low level signal, described second
Power supply signal is high level signal, and the first end of the luminescence unit is the cathode of Organic Light Emitting Diode, the luminescence unit
Second end be the Organic Light Emitting Diode anode.
7. a kind of image element driving method, for driving pixel circuit described in any one of claims 1-6；It is characterized in that, institute
Stating image element driving method includes:
First switch unit and partial pressure unit is connected using scanning signal, to control the voltage at driving transistor controls end, by institute
The first end for stating the voltage write-in first energy-storage units at driving transistor controls end, by the first power supply signal write-in first storage
The second end of energy unit；
The first switch unit and the partial pressure unit are turned off using the scanning signal, passes through the electricity in the energy-storage units
Transistor is driven described in pressure signal conduction, makes the first power supply signal that the luminescence unit be driven to shine.
8. image element driving method as claimed in claim 7, which is characterized in that the first switch unit includes first crystal
Pipe, the partial pressure unit includes second transistor, and the image element driving method includes:
The first transistor and second transistor is connected using scanning signal, to control the voltage at driving transistor controls end, by institute
The first end for stating the voltage write-in first energy-storage units at driving transistor controls end, by the first power supply signal write-in first storage
The second end of energy unit；
The first transistor and the second transistor are turned off using the scanning signal, passes through the electricity in the energy-storage units
Transistor is driven described in pressure signal conduction, makes the first power supply signal that the luminescence unit be driven to shine.
9. image element driving method as claimed in claim 7, which is characterized in that the first switch unit includes first crystal
Pipe, the partial pressure unit include the 4th transistor, the 5th transistor and second energy-storage units, and the image element driving method includes:
The first transistor and the 4th transistor is connected using the first scanning signal and the second scanning signal and turns off institute
The 5th transistor is stated, by the first end of voltage data signal write-in first energy-storage units, by first power supply signal
The second end of first energy-storage units is written；
The 5th transistor is connected using first scanning signal and second scanning signal and turns off the first transistor
With the 4th transistor, first power supply signal is written to the second end of the second energy-storage units；
Using first scanning signal and second scanning signal turn off the first transistor, the 4th transistor and
The driving crystal is connected by the voltage signal in the first energy-storage units lattice second energy-storage units in 5th transistor
Pipe makes the first power supply signal that the luminescence unit be driven to shine.
10. a kind of display device, which is characterized in that including any pixel circuit of claim 1-6.
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| CN201811158627.4A CN109308878B (en) | 2018-09-30 | 2018-09-30 | Pixel circuit, driving method thereof and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111179838A (en) * | 2020-02-21 | 2020-05-19 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit, display panel and method for improving low gray scale uniformity of display panel |
| WO2023010592A1 (en) * | 2021-08-02 | 2023-02-09 | Tcl华星光电技术有限公司 | Pixel driving circuit and mobile terminal |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040007989A1 (en) * | 2002-07-12 | 2004-01-15 | Au Optronics Corp. | Driving circuit for unit pixel of organic light emitting displays |
| CN1892751A (en) * | 2005-06-30 | 2007-01-10 | Lg.菲利浦Lcd株式会社 | Light emitting display device and method for driving the same |
| CN101140733A (en) * | 2006-09-08 | 2008-03-12 | 胜华科技股份有限公司 | Driver circuit having electromechanical excitation light dipolar body and driving method thereof |
| CN101149899A (en) * | 2006-09-22 | 2008-03-26 | 三星Sdi株式会社 | Driving circuit and organic light emitting diode display device thereof |
| KR20090014484A (en) * | 2007-08-06 | 2009-02-11 | 엘지디스플레이 주식회사 | Pixel circuit of organic light emitting display |
| CN102005182A (en) * | 2010-11-18 | 2011-04-06 | 友达光电股份有限公司 | Driving circuit of pixel and method for driving pixel |
| CN104167168A (en) * | 2014-06-23 | 2014-11-26 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof and display device |
| US20150009191A1 (en) * | 2006-01-09 | 2015-01-08 | Ignis Innovation Inc. | Method and system for driving an active matrix display circuit |
| CN104505020A (en) * | 2014-12-16 | 2015-04-08 | 南京中电熊猫液晶显示科技有限公司 | Pixel compensation structure of AM-OLED (active matrix organic light emitting diode) display and driving method for pixel compensation structure |
| CN105336293A (en) * | 2014-08-06 | 2016-02-17 | 上海和辉光电有限公司 | OLED (organic light emitting diode) pixel circuit |
-
2018
- 2018-09-30 CN CN201811158627.4A patent/CN109308878B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040007989A1 (en) * | 2002-07-12 | 2004-01-15 | Au Optronics Corp. | Driving circuit for unit pixel of organic light emitting displays |
| CN1892751A (en) * | 2005-06-30 | 2007-01-10 | Lg.菲利浦Lcd株式会社 | Light emitting display device and method for driving the same |
| US20150009191A1 (en) * | 2006-01-09 | 2015-01-08 | Ignis Innovation Inc. | Method and system for driving an active matrix display circuit |
| CN101140733A (en) * | 2006-09-08 | 2008-03-12 | 胜华科技股份有限公司 | Driver circuit having electromechanical excitation light dipolar body and driving method thereof |
| CN101149899A (en) * | 2006-09-22 | 2008-03-26 | 三星Sdi株式会社 | Driving circuit and organic light emitting diode display device thereof |
| KR20090014484A (en) * | 2007-08-06 | 2009-02-11 | 엘지디스플레이 주식회사 | Pixel circuit of organic light emitting display |
| CN102005182A (en) * | 2010-11-18 | 2011-04-06 | 友达光电股份有限公司 | Driving circuit of pixel and method for driving pixel |
| CN104167168A (en) * | 2014-06-23 | 2014-11-26 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof and display device |
| CN105336293A (en) * | 2014-08-06 | 2016-02-17 | 上海和辉光电有限公司 | OLED (organic light emitting diode) pixel circuit |
| CN104505020A (en) * | 2014-12-16 | 2015-04-08 | 南京中电熊猫液晶显示科技有限公司 | Pixel compensation structure of AM-OLED (active matrix organic light emitting diode) display and driving method for pixel compensation structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111179838A (en) * | 2020-02-21 | 2020-05-19 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit, display panel and method for improving low gray scale uniformity of display panel |
| US11335256B2 (en) | 2020-02-21 | 2022-05-17 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Pixel circuit, display panel and method for improving low gray-level uniformity for display panel |
| WO2023010592A1 (en) * | 2021-08-02 | 2023-02-09 | Tcl华星光电技术有限公司 | Pixel driving circuit and mobile terminal |
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| Publication number | Publication date |
|---|---|
| CN109308878B (en) | 2020-11-27 |
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