CN110491338A - Pixel circuit and its driving method, emission control circuit and method, display device - Google Patents
Pixel circuit and its driving method, emission control circuit and method, display device Download PDFInfo
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- CN110491338A CN110491338A CN201910802754.1A CN201910802754A CN110491338A CN 110491338 A CN110491338 A CN 110491338A CN 201910802754 A CN201910802754 A CN 201910802754A CN 110491338 A CN110491338 A CN 110491338A
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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
- 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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The disclosure is directed to a kind of pixel circuit and its driving methods, emission control circuit and method, display device, the pixel circuit includes the first drive sub-circuits, the second drive sub-circuits, data write-in sub-circuit light emitting control sub-circuit and energy storage sub-circuit, first drive sub-circuits are separately connected the first power end, light-emitting component and first node, for generating the first driving current；Data are written sub-circuit and are used in response to scanning signal and by data signal transmission to the first node；Second drive sub-circuits are separately connected the light-emitting component and the first node, for generating the second driving current；Light emitting control sub-circuit is used to that the first power supply signal to be transmitted to the second drive sub-circuits in response to LED control signal；Energy storage sub-circuit first end is connected to the second end of the data write-in sub-circuit, and second end is connected to first power end.
Description
Technical field
This disclosure relates to field of display technology, in particular to a kind of pixel circuit and its driving method, light emitting control
Circuit and method, display device.
Background technique
It is with the development of technology and progressive, OLED (Organic Light Emitting Diode, organic light-emitting diodes
Pipe) display device use it is gradually extensive.OLED brightness adjustment approach includes time scale method and area ratio method, is used at present
More is time scale method.Time scale method is to control its brightness, time scale method by controlling the fluorescent lifetime of OLED
It is realized by the way that in low-light level, the frequency of LED control signal is turned down by low-light level, excessively low-frequency LED control signal
It will cause display device and dodge frequency, human eye is damaged.
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, emission control circuit and method, display
Device, and then display device can occur to dodge frequency when overcoming low-light level in the related technology at least to some extent, cause to damage to human eye
Harmful problem.
According to the disclosure in a first aspect, providing a kind pixel circuit, the pixel circuit includes:
First drive sub-circuits are separately connected the first power end, light-emitting component and first node, for generating the first driving
Electric current；
Sub-circuit is written in data, is separately connected data signal end, the first node and scanning signal end, sweeps for responding
Retouch signal and by data signal transmission to the first node；
Second drive sub-circuits are separately connected the light-emitting component and the first node, for generating the second driving electricity
Stream；
Light emitting control sub-circuit is separately connected first power end, second drive sub-circuits and light emitting control end,
For the first power supply signal to be transmitted to the second drive sub-circuits in response to LED control signal；
Energy storage sub-circuit, first end are connected to the second end of data write-in sub-circuit, and second end is connected to described the
One power end.
According to an embodiment of the disclosure, first drive sub-circuits include:
First driving transistor, first end are connected to first power end, and second end is connected to the light-emitting component, control
End processed is connected to the first node；
Second drive sub-circuits include:
Second driving transistor, first end are connected to the light emitting control sub-circuit, and second end is connected to the luminous member
Part, control terminal are connected to the first node.
According to an embodiment of the disclosure, the breadth length ratio of the first driving transistor channel is less than second driving
The breadth length ratio of transistor channel.
According to an embodiment of the disclosure, the length of the first driving transistor channel is greater than described second and drives
The length of dynamic transistor channel.
According to an embodiment of the disclosure, the data write-in sub-circuit includes:
The first transistor, first end connect the data signal end, and second end connects the first node, control terminal connection
The scanning signal end, is connected for responding the scanning signal, by the data signal transmission to the first node.
According to an embodiment of the disclosure, the light emitting control sub-circuit includes:
Second transistor, first end are connected to first power end, and second end is connected to second drive sub-circuits
First end, control terminal is connected to the light emitting control end, is connected for responding the LED control signal with by described
One power supply signal is transmitted to the first end of second drive sub-circuits.
According to an embodiment of the disclosure, the pixel circuit further include:
Sub-circuit is initialized, reset signal end, initialization control signal end and the first node are separately connected, for ringing
Answer initialization control signal that reset signal is transmitted to the first node.
According to an embodiment of the disclosure, the initialization sub-circuit includes:
Third transistor, first end connect reset signal end, and second end connects first node, control terminal connection initialization control
Reset signal is transmitted to the first node for being connected in response to initialization control signal by signal end processed.
According to the second aspect of the disclosure, a kind of driving method of pixel circuit is provided, for above-mentioned pixel circuit, institute
Stating driving method includes:
Using scanning signal and LED control signal, data is connected, sub-circuit is written, turn off light emitting control sub-circuit, it will
Energy storage sub-circuit is written in data-signal；
Using the scanning signal and the LED control signal, the data write-in sub-circuit is turned off, light emission luminance is worked as
When greater than first threshold, the light emitting control sub-circuit is connected, to lead by the data-signal in the energy storage sub-circuit
Logical first drive sub-circuits and the second drive sub-circuits, driving light-emitting component shine；When luminous sub-circuit is less than or equal to described the
When one threshold value, the light emitting control sub-circuit is turned off, to pass through the data-signal conducting described first in the energy storage sub-circuit
Drive sub-circuits drive the light-emitting component to shine.
According to the third aspect of the disclosure, a kind of emission control circuit is provided, the emission control circuit includes:
Above-mentioned pixel circuit；
Sub-circuit is judged, for judging whether light emission luminance is greater than first threshold, when the light emission luminance is greater than described the
First control signal is exported when one threshold value, the second control of output letter when the light emission luminance is less than or equal to the first threshold
Number；
LED control signal generates sub-circuit, connects respectively with the judgement sub-circuit and light emitting control sub-circuit, uses
The LED control signal that duty ratio is greater than zero is generated in the response first control signal, the second control signal is responded and produces
The LED control signal that raw duty ratio is zero, and the LED control signal is supplied to the light emitting control sub-circuit.
It is described to shine when the light emitting control sub-circuit includes second transistor according to an embodiment of the disclosure
Control signal generates the control terminal that sub-circuit is connected to the second transistor.
According to the fourth aspect of the disclosure, a kind of light-emitting control method is provided, it is described for above-mentioned emission control circuit
Method includes:
Judge whether light emission luminance is greater than first threshold；
When the light emission luminance be greater than the first threshold when export first control signal, when the light emission luminance be less than etc.
When the first threshold, second control signal is exported；
The LED control signal that duty ratio is greater than zero is generated according to the first control signal, is believed according to second control
Number generate duty ratio be zero LED control signal；
It is controlled and is shone using scanning signal, data-signal and the LED control signal.
According to the 5th of the disclosure the aspect, a kind of display device is provided, the display device includes above-mentioned light emitting control
Circuit.
The pixel circuit that the embodiment of the present disclosure provides generates the first driving current by the first drive sub-circuits, by the
Two drive sub-circuits generate the second driving current, common by the first driving current and the second driving current in high display brightness
Light-emitting component is driven, light-emitting component is driven by the first driving current under low display brightness, utilizes the side for reducing driving current
Formula carries out low-light level and shows, avoids controlling light emission luminance using low frequency LED control signal when low-light level is shown, caused
Stroboscopic damages human eye.
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.
The circuit diagram for the first pixel circuit that Fig. 1 disclosure illustrative embodiments provide；
The circuit diagram for second of pixel circuit that Fig. 2 disclosure illustrative embodiments provide；
The circuit diagram for the third pixel circuit that Fig. 3 disclosure illustrative embodiments provide；
The circuit diagram for the 4th kind of pixel circuit that Fig. 4 disclosure illustrative embodiments provide；
A kind of driver' s timing figure for pixel circuit that Fig. 5 disclosure illustrative embodiments provide；
A kind of flow chart of the driving method for pixel circuit that Fig. 6 disclosure illustrative embodiments provide；
A kind of circuit diagram for emission control circuit that Fig. 7 disclosure illustrative embodiments provide；
A kind of flow chart for light-emitting control method that Fig. 8 disclosure illustrative embodiments provide.
In figure:
100, the first drive sub-circuits；200, the second drive sub-circuits；300, sub-circuit is written in data；400, light emitting control
Sub-circuit；500, energy storage sub-circuit；600, sub-circuit is initialized；
10, pixel circuit；20, judge sub-circuit；30, LED control signal generates sub-circuit；
DT1, the first driving transistor；DT2, the second driving transistor；T1, the first transistor；T2, second transistor；T3,
Third transistor；Cst, storage capacitor.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be real in a variety of forms
It applies, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will be comprehensively and complete
It is whole, and the design of example embodiment is comprehensively communicated to those skilled in the art.Identical appended drawing reference indicates in figure
Same or similar part, thus repetition thereof will be omitted.
In addition, described feature, structure or characteristic can be incorporated in one or more implementations in any suitable manner
In example.In the following description, many details are provided to provide and fully understand to embodiment of the disclosure.However,
It will be appreciated by persons skilled in the art that can be with technical solution of the disclosure without one in the specific detail or more
It is more, or can be using other methods, constituent element, material, device, step etc..In other cases, it is not shown in detail or describes
Known features, method, apparatus, realization, material or operation are to avoid fuzzy all aspects of this disclosure.
Block diagram shown in the drawings is only functional entity, not necessarily must be corresponding with physically separate entity.
I.e., it is possible to realize these functional entitys using software form, or these are realized in the module of one or more softwares hardening
A part of functional entity or functional entity, or realized in heterogeneous networks and/or processor device and/or microcontroller device
These functional entitys.
Disclosure illustrative embodiments provide a kind of pixel circuit first, as shown in Figure 1, the pixel circuit includes:
First drive sub-circuits 100, the second drive sub-circuits 200, data write-in sub-circuit 300, light emitting control sub-circuit 400 and energy storage
Sub-circuit 500.First drive sub-circuits 100 are separately connected the first power end, light-emitting component and first node N1, for generating the
One driving current；Data write-in sub-circuit 300 is separately connected data signal end, the first node N1 and scanning signal end, uses
In data-signal DATA is transmitted to the first node N1 in response to scanning signal Sn；Second drive sub-circuits 200 connect respectively
The light-emitting component and the first node N1 are connect, for generating the second driving current；Light emitting control sub-circuit 400 is separately connected
First power end, second drive sub-circuits 200 and light emitting control end, in response to LED control signal EM and by
One power supply signal VDD is transmitted to the second drive sub-circuits 200；500 first end of energy storage sub-circuit is connected to data write-in
The second end of circuit 300, second end are connected to first power end.
The pixel circuit that the embodiment of the present disclosure provides generates the first driving current by the first drive sub-circuits 100, passes through
Second drive sub-circuits 200 generate the second driving current, pass through the first driving current and the second driving electricity in high display brightness
Stream is common to drive light-emitting component, drives light-emitting component by the first driving current under low display brightness, electric using driving is reduced
The mode of stream carries out low-light level and shows, avoids controlling luminance using low frequency LED control signal EM when low-light level is shown
Degree, caused stroboscopic damage human eye.
Further, as shown in Fig. 2, the pixel circuit that the embodiment of the present disclosure provides can also include initialization sub-circuit
600, it is separately connected reset signal end, initialization control signal end and the first node N1, for responding initialization control letter
Reset signal Vint is transmitted to the first node N1 by number Vn.First node N1 is answered by initializing sub-circuit 600
Position avoids the problems such as image retention or smear occur when display.
Each composition sub-circuit of the pixel circuit provided the embodiment of the present disclosure is described in detail below:
As shown in figure 3, first drive sub-circuits 100 include the first driving transistor DT1, the first driving transistor
The first end of DT1 is connected to first power end, and the second end of the first driving transistor DT1 is connected to the light-emitting component,
The control terminal of first driving transistor DT1 is connected to the first node N1.
Second drive sub-circuits 200 include the second driving transistor DT2, the first end connection of the second driving transistor DT2
In the light emitting control sub-circuit 400, the second end of the second driving transistor DT2 is connected to the light-emitting component, the second driving
The control terminal of transistor DT2 is connected to the first node N1.The first driving of first end connection transistor DT1's of light-emitting component
The second end of second end and the second driving transistor DT2, the second end of light-emitting component connect second source signal VSS.
Wherein, the breadth length ratio of the first driving transistor DT1 channel is less than the second driving transistor DT2 channel
Breadth length ratio.Under identical condition, driving current is directly proportional with the driving channel width-over-length ratio of transistor, therefore the first driving crystal
The first driving current that pipe DT1 is generated is less than the second driving current that the second driving transistor DT2 is generated.When low-light level is shown,
By the first driving current drive light-emitting component shine, avoid in low-light level by reduce luminous frequency, caused by dodge frequency.
In a feasible embodiment, the length of the first driving transistor DT1 channel is greater than the second driving transistor DT2
The width of the length of channel, the first driving transistor DT1 and the second driving transistor DT2 can be identical.
The data write-in sub-circuit 300 includes the first transistor T1, and the first end of the first transistor T1 connects the number
According to signal end, described in the control terminal connection of second end connection the first node N1, the first transistor T1 of the first transistor T1
Scanning signal end, the first transistor T1 transmit the data-signal DATA for responding the scanning signal Sn and being connected
To the first node N1.
The light emitting control sub-circuit 400 includes second transistor T2, and the first end of second transistor T2 is connected to described
First power end, the second end of second transistor T2 are connected to the first end of second drive sub-circuits 200, second transistor
The control terminal of T2 is connected to the light emitting control end, second transistor T2 for respond the LED control signal EM and be connected with
The first power supply signal VDD is transmitted to the first end of second drive sub-circuits 200.
The initialization sub-circuit 600 includes third transistor T3, and the first end of third transistor T3 connects reset signal
End, the second end of third transistor T3 connect first node N1, and the control terminal of third transistor T3 connects initialization control signal
Reset signal Vint is transmitted to described first for being connected in response to initialization control signal Vn by end, third transistor T3
Node N1.
Wherein, a transistor described in the embodiment of the present disclosure 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.Energy storage sub-circuit 500 can be with
Including storage capacitor Cst, the first end of storage capacitor Cst connects first node N1, and second end connects the first power supply signal VDD.
All transistors can be P-type TFT, and the driving voltage of each transistor is low level voltage；Herein
In the case of, the first power supply signal VDD can be low level signal, and the second source signal VSS can believe for high level
Number, the first end of the light-emitting component is the cathode of OLED, and the second end of the light-emitting component is the anode of OLED.
Alternatively, all transistors can be N-type TFT, the driving voltage of each transistor is high level electricity
Pressure；In the case, the first power supply signal VDD can be high level signal, and the second source signal VSS can be low
Level signal, the first end of the light-emitting component are the anode of OLED, and the second end of the light-emitting component is the cathode of OLED.
Work below with reference to the working timing figure of pixel-driving circuit shown in fig. 5 to the pixel-driving circuit in Fig. 4
Process is described in detail.The driver' s timing figure depicts scanning signal Sn, LED control signal EM, initialization control signal
Level state of the Vn and data-signal DATA in four periods.
First time period t1 (reseting stage): initialization control signal Vn is low level, and LED control signal EM is high electricity
Flat, scanning signal Sn is high level, third transistor T3 conducting, the first transistor T1 and second transistor T2 shutdown, resets letter
The control terminal that number Vint is transferred to first node N1, the first driving transistor DT1 and the second driving transistor DT2 is realized initial
Change.
Second time period t2 (data write phase): initialization control signal Vn is high level, and LED control signal EM is
High level, scanning signal Sn are low level, and third transistor T3 is turned off, the first transistor T1 conducting, second transistor T2 shutdown,
Energy storage sub-circuit 500 is written in data-signal DATA.
Third time period t 3 (low-light level light emitting phase): initialization control signal Vn is high level, LED control signal EM
For high level, scanning signal Sn is high level, third transistor T3 shutdown, the first transistor T1 shutdown, the pass second transistor T2
Disconnected, the first driving transistor DT1 and the second driving transistor DT2 shutdown, the first driving transistor DT1 generate the first driving electricity
Stream, the first driving current drive light-emitting component to shine.
4th time period t 4 (high brightness light emitting phase): initialization control signal Vn is high level, LED control signal EM
For low level, scanning signal Sn is high level, and third transistor T3 is turned off, and the first transistor T1 shutdown, second transistor T2 is led
Logical, the first driving transistor DT1 and the second driving transistor DT2 conducting, the first driving transistor DT1 generate the first driving electricity
Stream, the second driving transistor DT2 generate the second driving current, and the first driving current and the second driving current drive the member that shines simultaneously
Part shines.
It is worth noting that, t3 and t4 are not the restriction to t3 and t4 phases-time sequencing, in practical applications
Low-light level shows stage or the stage of being highlighted when judging the display stage according to actual displayed brightness when display.For example,
When display brightness is less than specified threshold, it can be low-light level and show the stage, it, can when real brightness is more than or equal to specified threshold
To be that the stage is highlighted.
It should be understood that all transistors are P-type transistor in above-mentioned specific embodiment；But this field skill
Art personnel are easy the pixel-driving circuit according to provided by the disclosure and obtain the pixel driver that all transistors are N-type transistor
Circuit.Certainly, pixel-driving circuit provided by the disclosure is also readily modified as CMOS (Complementary Metal Oxide
Semiconductor, complementary metal oxide semiconductor) circuit etc., it is not limited to pixel provided in the present embodiment is driven
Dynamic circuit, which is not described herein again.
The pixel circuit that the embodiment of the present disclosure provides generates the first driving current by the first drive sub-circuits 100, passes through
Second drive sub-circuits 200 generate the second driving current, pass through the first driving current and the second driving electricity in high display brightness
Stream is common to drive light-emitting component, drives light-emitting component by the first driving current under low display brightness, electric using driving is reduced
The mode of stream carries out low-light level and shows, avoids controlling luminance using low frequency LED control signal EM when low-light level is shown
Degree, caused stroboscopic damage human eye.
Disclosure illustrative embodiments also provide a kind of driving method of pixel circuit, for above-mentioned pixel circuit,
As shown in fig. 6, the driving method includes:
Step S610 is connected data and sub-circuit 300, shutdown hair is written using scanning signal Sn and LED control signal EM
Energy storage sub-circuit 500 is written in data-signal DATA by photocontrol sub-circuit 400；
Step S620 turns off the data write-in son electricity using the scanning signal Sn and the LED control signal EM
When light emission luminance is greater than first threshold the light emitting control sub-circuit 400 is connected, to pass through the energy storage sub-circuit in road 300
The first drive sub-circuits 100 and the second drive sub-circuits 200 are connected in the data-signal DATA in 500, drive light-emitting component
It shines；When luminous sub-circuit is less than or equal to the first threshold, the light emitting control sub-circuit 400 is turned off, by described
First drive sub-circuits 100 are connected in data-signal DATA in energy storage sub-circuit 500, and the light-emitting component is driven to shine.
The pixel circuit drive method that the embodiment of the present disclosure provides generates the first driving by the first drive sub-circuits 100
Electric current generates the second driving current by the second drive sub-circuits 200, passes through the first driving current and the in high display brightness
Two driving currents drive light-emitting component jointly, drive light-emitting component by the first driving current under low display brightness, utilize drop
The mode of low driving current carries out low-light level and shows, avoids controlling when low-light level is shown using low frequency LED control signal EM
Light emission luminance, caused stroboscopic damage human eye.
When pixel circuit further includes initialization sub-circuit 600, the pixel circuit drive method can also include: to utilize
Data initialization sub-circuit 600, shutdown write-in is connected in initialization control signal Vn, scanning signal Sn and LED control signal EM
Sub-circuit and light emitting control sub-circuit 400, are transmitted to first node N1 for reset signal Vint.
Disclosure illustrative embodiments also provide a kind of emission control circuit, as shown in fig. 7, the emission control circuit
Include: above-mentioned pixel circuit 10, judge that sub-circuit 20 and LED control signal generate sub-circuit 30；Judge that sub-circuit 20 is used for
Judge whether light emission luminance is greater than first threshold, the first control of output letter when the light emission luminance is greater than the first threshold
Number, second control signal is exported when the light emission luminance is less than or equal to the first threshold；LED control signal generates son electricity
Road 30 is connected with the judgement sub-circuit 20 and light emitting control sub-circuit 400 respectively, for responding the first control signal
And the LED control signal EM that duty ratio is greater than zero is generated, it responds the second control signal and generates the luminous control that duty ratio is zero
Signal EM processed, and the LED control signal EM is supplied to the light emitting control sub-circuit 400.
The emission control circuit that the embodiment of the present disclosure provides, by judging that sub-circuit judges light emission luminance, light emitting control letter
Number generating sub-circuit exports the first LED control signal or the second LED control signal, light emitting control sub-circuit according to judging result
400 response the first LED control signal conductings, light emitting control sub-circuit 400 respond the shutdown of the second LED control signal, realize
When high display brightness light-emitting component is driven by the first driving current and the second driving current jointly, passed through under low display brightness
First driving current drives light-emitting component, carries out low-light level by way of reducing driving current and shows, avoids aobvious in low-light level
Light emission luminance, the problem of caused stroboscopic damages human eye, are controlled using low frequency LED control signal when showing.
Wherein, when the light emitting control sub-circuit 400 includes second transistor T2, the LED control signal generates son
Circuit connection is in the control terminal of the second transistor T2.Judge that sub-circuit can judge light emission luminance by display grayscale, when
It is aobvious for low-light level when showing that grayscale is less than or equal to specified threshold for the stage is highlighted when display grayscale is greater than specified threshold
Show the stage.
Disclosure illustrative embodiments also provide a kind of light-emitting control method, for above-mentioned emission control circuit, such as
Shown in Fig. 8, which comprises
Step S810, judges whether light emission luminance is greater than first threshold；
Step S820 exports first control signal when the light emission luminance is greater than the first threshold, shines when described
When brightness is less than or equal to the first threshold, second control signal is exported；
Step S830 generates the LED control signal EM that duty ratio is greater than zero according to the first control signal, according to institute
It states second control signal and generates the LED control signal EM that duty ratio is zero；
Step S840 is controlled using scanning signal Sn, data-signal DATA and the LED control signal EM and is shone.
The light-emitting control method that the embodiment of the present disclosure provides, by judging that sub-circuit judges light emission luminance, light emitting control letter
Number generate sub-circuit according to judging result export the first LED control signal EM or the second LED control signal EM, light emitting control son
Circuit 400 responds the first LED control signal EM conducting, and light emitting control sub-circuit 400 responds the second LED control signal EM and closes
It is disconnected, it realizes and light-emitting component is driven by the first driving current and the second driving current jointly in high display brightness, in low display
Light-emitting component is driven by the first driving current under brightness, low-light level is carried out by way of reducing driving current and shows, avoid
Light emission luminance is controlled using low frequency LED control signal EM in low-light level display, caused stroboscopic is hurtful to human eye
Problem.
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..
Disclosure illustrative embodiments also provide a kind of display device, and the display device includes above-mentioned light emitting control
Circuit.The display device for example may include mobile phone, tablet computer, television set, laptop, Digital Frame, navigator
Etc. any products or components having a display function.
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 son electricity of pixel circuit and emission control circuit in the above detailed description
Road, but this division is not enforceable.In fact, according to embodiment of the present disclosure, it is above-described two or more
The feature and function of sub-circuit can embody in a sub-circuit.Conversely, the feature of an above-described sub-circuit and
Function can be to be embodied by multiple sub-circuits with further division.
Person of ordinary skill in the field it is understood that various aspects of the invention can be implemented as system, method or
Program product.Therefore, various aspects of the invention can be embodied in the following forms, it may be assumed that complete hardware embodiment, completely
Software implementation (including firmware, microcode etc.) or hardware and software in terms of combine embodiment, may be collectively referred to as here
Circuit, " module " or " system ".
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
His embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Adaptive change follow 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 claim
It points out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the attached claims.
Claims (13)
1. a kind of pixel circuit, which is characterized in that the pixel circuit includes:
First drive sub-circuits are separately connected the first power end, light-emitting component and first node, for generating the first driving electricity
Stream；
Sub-circuit is written in data, is separately connected data signal end, the first node and scanning signal end, for responding scanning letter
Number and by data signal transmission to the first node；
Second drive sub-circuits are separately connected the light-emitting component and the first node, for generating the second driving current；
Light emitting control sub-circuit is separately connected first power end, second drive sub-circuits and light emitting control end, is used for
The first power supply signal is transmitted to the second drive sub-circuits in response to LED control signal；
Energy storage sub-circuit, first end are connected to the second end of the data write-in sub-circuit, and second end is connected to first electricity
Source.
2. pixel circuit as described in claim 1, which is characterized in that first drive sub-circuits include:
First driving transistor, first end are connected to first power end, and second end is connected to the light-emitting component, control terminal
It is connected to the first node；
Second drive sub-circuits include:
Second driving transistor, first end are connected to the light emitting control sub-circuit, and second end is connected to the light-emitting component, control
End processed is connected to the first node.
3. pixel circuit as claimed in claim 2, which is characterized in that the breadth length ratio of the first driving transistor channel is less than
The breadth length ratio of the second driving transistor channel.
4. pixel circuit as claimed in claim 3, which is characterized in that the length of the first driving transistor channel is greater than institute
State the length of the second driving transistor channel.
5. pixel circuit as described in claim 1, which is characterized in that the data are written sub-circuit and include:
The first transistor, first end connect the data signal end, and second end connects the first node, described in control terminal connection
Scanning signal end is connected for responding the scanning signal, by the data signal transmission to the first node.
6. pixel circuit as described in claim 1, which is characterized in that the light emitting control sub-circuit includes:
Second transistor, first end are connected to first power end, and second end is connected to the of second drive sub-circuits
One end, control terminal are connected to the light emitting control end, are connected for responding the LED control signal with electric by described first
Source signal is transmitted to the first end of second drive sub-circuits.
7. pixel circuit as described in claim 1, which is characterized in that the pixel circuit further include:
Sub-circuit is initialized, reset signal end, initialization control signal end and the first node are separately connected, for responding just
Beginningization controls signal and reset signal is transmitted to the first node.
8. pixel circuit as claimed in claim 7, which is characterized in that the initialization sub-circuit includes:
Third transistor, first end connect reset signal end, and second end connects first node, control terminal connection initialization control letter
Number end, for being connected in response to initialization control signal, reset signal is transmitted to the first node.
9. a kind of driving method of pixel circuit, which is characterized in that the described in any item pixel circuits of claim 1-8 are used for,
The driving method includes:
Using scanning signal and LED control signal, data is connected, sub-circuit is written, light emitting control sub-circuit is turned off, by data
Energy storage sub-circuit is written in signal；
Using the scanning signal and the LED control signal, the data write-in sub-circuit is turned off, when light emission luminance is greater than
When first threshold, the light emitting control sub-circuit is connected, to pass through the data-signal in energy storage sub-circuit conducting the
One drive sub-circuits and the second drive sub-circuits, driving light-emitting component shine；When luminous sub-circuit is less than or equal to first threshold
When value, the light emitting control sub-circuit is turned off, first driving is connected by the data-signal in the energy storage sub-circuit
Sub-circuit drives the light-emitting component to shine.
10. a kind of emission control circuit, which is characterized in that the emission control circuit includes:
The described in any item pixel circuits of claim 1-8；
Sub-circuit is judged, for judging whether light emission luminance is greater than first threshold, when the light emission luminance is greater than first threshold
First control signal is exported when value, exports second control signal when the light emission luminance is less than or equal to the first threshold；
LED control signal generates sub-circuit, connects respectively with the judgement sub-circuit and light emitting control sub-circuit, for ringing
It answers the first control signal and generates the LED control signal that duty ratio is greater than zero, respond the second control signal generation and account for
The LED control signal that sky ratio is zero, and the LED control signal is supplied to the light emitting control sub-circuit.
11. emission control circuit as claimed in claim 10, which is characterized in that when the light emitting control sub-circuit includes second
When transistor, the LED control signal generates the control terminal that sub-circuit is connected to the second transistor.
12. a kind of light-emitting control method, which is characterized in that for emission control circuit described in claim 8 or 9, the side
Method includes:
Judge whether light emission luminance is greater than first threshold；
First control signal is exported when the light emission luminance is greater than the first threshold, when the light emission luminance is less than or equal to institute
When stating first threshold, second control signal is exported；
The LED control signal that duty ratio is greater than zero is generated according to the first control signal, is produced according to the second control signal
The LED control signal that raw duty ratio is zero；
It is controlled and is shone using scanning signal, data-signal and the LED control signal.
13. a kind of display device, which is characterized in that the display device includes the electricity of light emitting control described in claim 9 or 10
Road.
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| CN201910802754.1A CN110491338B (en) | 2019-08-28 | 2019-08-28 | Pixel circuit, driving method thereof, light-emitting control circuit, light-emitting control method and display device |
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| CN201910802754.1A CN110491338B (en) | 2019-08-28 | 2019-08-28 | Pixel circuit, driving method thereof, light-emitting control circuit, light-emitting control method and display device |
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| CN110491338B CN110491338B (en) | 2021-02-02 |
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| US10878752B1 (en) | 2020-04-17 | 2020-12-29 | Shanghai Tianma Am-Oled Co.,Ltd. | Pixel driving circuit and driving method, and display device |
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