CN104376815B - Pixel-driving circuit, method, display panel and display device - Google Patents
Pixel-driving circuit, method, display panel and display device Download PDFInfo
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- CN104376815B CN104376815B CN201410746117.4A CN201410746117A CN104376815B CN 104376815 B CN104376815 B CN 104376815B CN 201410746117 A CN201410746117 A CN 201410746117A CN 104376815 B CN104376815 B CN 104376815B
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Abstract
The present invention provides a kind of pixel-driving circuit, method, display panel and display device.The pixel-driving circuit includes driving transistor, switch control unit and threshold control unit, wherein, driving transistor is floating transistor；Threshold control unit is within each display cycle, when scanning signal is effective, the current potential of the control gate of the driving transistor is charged to predetermined threshold controlling potential by control by programmable voltage modulated signal, and control to maintain the current potential of the control gate of driving transistor for predetermined threshold controlling potential when scanning signal is invalid, the threshold voltage of driving transistor is controlled in predetermined threshold voltage range.The present invention solves the OLED pixel circuit of existing voltage driven mode due to crystalline stability during the manufacture craft of transistor and doping homogeneity, so that the problem of easily producing picture chromenence or uneven gray scale in display picture caused by the threshold voltage of portion of transistor drifts about in OLED pixel circuit.
Description
Technical field
The present invention relates to display field, more particularly to a kind of pixel-driving circuit, method, display panel and display dress
Put.
Background technology
OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode) device, which has, actively to light, and resists
Pinking is good, and visual angle is wide, and operation temperature is wide, and contrast is high, and the advantages of Flexible Displays can be achieved is acknowledged as field of liquid crystal display
Regeneration product, meanwhile, as luminous efficiency and life-span rise year by year, OLED also can be answered widely in addition to available for display
For lighting field.
The basic structure of OLED be between by anode and metal level of transparent electrode layer being negative electrode on substrate successively
Hole injection layer, hole transmission layer and electron injecting layer is deposited, each layer being arranged between transparent electrode layer and metal level is
Organic semiconducting materials.When OLED gets appropriate supply of electric power, hole and electronics are noted from anode and negative electrode respectively
Enter, then conducted through hole and electron transfer layer to luminescent layer, and occur radiation recombination in luminous material layer, luminous material layer
Outer-shell electron, which absorbs, is in excitation state after energy, radiation transistion is realized luminous.
Common OLED has voltage driving and electric current to drive two ways.Voltage driving mode circuit is simple, operation
Simply, but easily due to OLED, the uneven of the doping of the crystallization of polysilicon causes each crystal during manufacture craft
The threshold voltage of pipe is different, causes the display picture Mura (colourity or gray scale are uneven) on electrical mechanism bad.Due to
The crystallization of polysilicon and doping process are difficult controlled, easily make the threshold voltage of each transistor inconsistent, threshold voltage hair
Raw drift, when picture is shown, it is impossible to which the electric current driving OLED required for reaching us is effectively shown, causes picture
There is the Mura badness on electrical mechanism.
As shown in figure 1, the pixel-driving circuit figure provided for prior art, the pixel-driving circuit includes switching transistor
T1, driving transistor T2 and storage capacitance C, wherein switching transistor T1 are connected with data wire Data, driving transistor T2 with
OLED O1 connections.Driving transistor T2 grid is connected with storage capacitance C.When current scan line Scan is arrived in scanning,
The switching transistor T1 being expert at is opened, and data wire Data is carried out during switching transistor T1 is opened to storage capacitance C
Charging, preserves data-signal, while driving transistor T2 is opened, OLED O1 is driven, and it is lighted.Scan line is swept
When describing one-level, namely switching transistor T1, when being closed, storage capacitance C completes the storage of electric charge within the scan period
Action, continues to keep the original potential of driving transistor T2 grid, so as to reach within switching transistor T1 deadlines
Driving OLED O1 continually and steadily lights in a cycle.During actual fabrication, due to the crystallization and doping of polysilicon
Technique is difficult controlled, easily makes that the threshold voltage of each transistor is inconsistent, threshold voltage drifts about, and causes picture to occur
Mura badness on electrical mechanism.
The content of the invention
It is a primary object of the present invention to provide a kind of pixel-driving circuit, method, display panel and display device, solve
The OLED pixel circuit of existing voltage driven mode is due to crystalline stability and doping during the manufacture craft of transistor
Homogeneity, so that holding caused by the threshold voltage of portion of transistor drifts about in OLED pixel circuit in display picture
The problem of being also easy to produce picture chromenence or uneven gray scale.
In order to achieve the above object, the invention provides a kind of pixel-driving circuit, including driving transistor, switch control
Unit and threshold control unit, wherein, the driving transistor is floating transistor；
The driving transistor, the first pole access driving voltage, the second pole is connected with OLED；
The switch control unit, is respectively connected to scanning signal and data-signal, and with the signal of the driving transistor
Grid are connected, within each display cycle, when the scanning signal is effective, and control is driven this by the data-signal
The current potential of the signal grid of transistor charges to predetermined switch controlling potential, and control remains described when the scanning signal is invalid
The current potential of the signal grid of driving transistor is predetermined switch controlling potential, is driven described with controlling the driving transistor to turn on
OLED；
The threshold control unit, is respectively connected to the scanning signal and programmable voltage modulated signal, and drive with described
The control gate connection of dynamic transistor, within each display cycle, when the scanning signal is effective, control can described in
The current potential of the control gate of the driving transistor is charged to predetermined threshold controlling potential by program voltage modulated signal, and is swept described
The current potential for controlling to maintain the control gate of the driving transistor when retouching invalidating signal is predetermined threshold controlling potential, is driven described
The threshold voltage of dynamic transistor is controlled in predetermined threshold voltage range.
During implementation, the switch control unit includes：
The first transistor, grid accesses the scanning signal, and the data-signal is accessed in the first pole, and the second pole is driven with described
The signal grid connection of dynamic transistor；
And, the first storage capacitance, first end is connected with the second pole of the first transistor, the second end ground connection.
During implementation, the threshold control unit includes：
Second transistor, grid accesses the scanning signal, the first pole access programmable voltage modulated signal, the second pole with
The control gate connection of the driving transistor；
And, the second storage capacitance, first end is connected with the second pole of the second transistor, the second end ground connection.
Present invention also offers a kind of image element driving method, the above-mentioned pixel-driving circuit for driving, including：Each
In display cycle,
When the scanning signal is effective, switch control unit control is by the data-signal by the letter of driving transistor
The current potential of number grid charges to predetermined switch controlling potential, when the scanning signal is invalid, and switch control unit control maintains institute
The current potential for stating the signal grid of driving transistor is predetermined switch controlling potential, is driven with controlling the driving transistor to turn on
OLED；
When the scanning signal is effective, threshold control unit control will be described by the programmable voltage modulated signal
The current potential of the control gate of driving transistor charges to predetermined threshold controlling potential, and control is maintained when the scanning signal is invalid
The current potential of the control gate of the driving transistor is predetermined threshold controlling potential, by the threshold voltage control of the driving transistor
System is in predetermined threshold voltage range.
Present invention also offers a kind of display panel, including data wire, scan line and light-emitting component, the scan line output
Scanning signal, the data wire outputting data signals；The display panel also includes above-mentioned pixel-driving circuit；
The switch element and control unit that the scan line includes with the pixel-driving circuit respectively are connected；
The switch element that the data wire includes with the pixel-driving circuit is connected；
Second pole of the driving transistor that the light-emitting component includes with the pixel-driving circuit is connected.
Present invention also offers a kind of display device, including above-mentioned display panel.
Compared with prior art, pixel-driving circuit of the present invention, method, display panel and display device, are used
Floating transistor is as driving transistor, and using the controllable characteristic of the threshold value of floating transistor, threshold control unit utilizes outside
Programmable voltage modulated signal the threshold voltage of floating transistor is regulated and controled, even if reach driving transistor make work
The phenomenon of threshold drift is produced in skill, can also reach that the threshold value of driving transistor is controlled in predetermined threshold voltage by external means
In the range of, the problem of effectively solving easily to produce picture chromenence or uneven gray scale during display picture.
Brief description of the drawings
Fig. 1 is the circuit diagram of existing pixel-driving circuit；
Fig. 2 is the structural representation of the pixel-driving circuit described in the embodiment of the present invention；
Fig. 3 is the circuit diagram of the pixel-driving circuit described in a specific embodiment of the invention；
Fig. 3 A are the working timing figures of the pixel-driving circuit described in specific embodiment as shown in Figure 3；
Fig. 4 is the signal timing diagram of pixel-driving circuit as shown in Figure 3 in the debugging stage；
Fig. 5 is the signal timing diagram of pixel-driving circuit as shown in Figure 3 in working stage.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
As shown in Fig. 2 the pixel-driving circuit described in the embodiment of the present invention, including driving transistor TD, switch control list
Member 21 and threshold control unit 22, wherein, the driving transistor TD is floating transistor；
The driving transistor TD, the first pole access driving voltage Vdd, the second pole is connected with OLED O1 anode；
Data in the switch control unit 21, the scanning signal being respectively connected on scan line Scan and data wire Data
Signal, and be connected with the signal grid of the driving transistor TD, within each display cycle, when the scanning signal is effective
When, the current potential of driving transistor TD signal grid is charged to predetermined switch controlling potential by control by the data-signal,
And control to maintain the current potential of the signal grid of the driving transistor TD to control electricity for predetermined switch when the scanning signal is invalid
Position, the OLED O1 is driven to control the driving transistor to turn on；
The threshold control unit 22, is respectively connected to scanning signal and programmable voltage modulation letter on the scan line Scan
Number Vadj, and be connected with the control gate of the driving transistor TD, within each display cycle, when the scanning signal has
During effect, control is charged to the current potential of driving transistor TD control gate by the programmable voltage modulated signal Vadj pre-
Determine threshold value controlling potential, and control when the scanning signal is invalid to maintain the current potential of the control gate of the driving transistor TD be
Predetermined threshold controlling potential, the threshold voltage of the driving transistor TD is controlled in predetermined threshold voltage range；
OLED O1 negative electrode is connected with ground terminal GND.
Pixel-driving circuit described in the embodiment of the present invention, using floating transistor as driving transistor, utilizes floating boom
The controllable characteristic of the threshold value of transistor, programmable voltage modulated signal Vadj of the threshold control unit outside is to floating boom crystal
The threshold voltage of pipe is regulated and controled, even if reaching that driving transistor produces the phenomenon of threshold drift in manufacture craft, can also be led to
Cross external means and reach that the threshold value of driving transistor is controlled in predetermined threshold voltage range, it is easy during display picture effectively to solve
The problem of producing picture chromenence or uneven gray scale.
In fig. 2, the first of TD extremely drains, TD the second extremely source electrode.
The transistor used in all embodiments of the invention can be thin film transistor (TFT) or FET or other characteristics
Identical device.In embodiments of the present invention, to distinguish the two poles of the earth of transistor in addition to grid, wherein first extremely can be source electrode
Or drain electrode, second can be extremely drain electrode or source electrode.In addition, transistor can be divided into n-type crystalline substance by being distinguished according to the characteristic of transistor
Body pipe or p-type transistor.In drive circuit provided in an embodiment of the present invention, all transistors are by taking p-type transistor as an example
The explanation of progress, it is contemplated that using n-type transistor realize when be that those skilled in the art can not make creation
Property work under the premise of readily occur in, therefore be also in embodiments of the invention protection domain.
In the specific implementation, the switch control unit can include：
The first transistor, grid accesses the scanning signal, and the data-signal is accessed in the first pole, and the second pole is driven with described
The signal grid connection of dynamic transistor；
And, the first storage capacitance, first end is connected with the second pole of the first transistor, the second end ground connection.
In the specific implementation, the threshold control unit includes：
Second transistor, grid accesses the scanning signal, and the first pole is connected with programmable voltage modulated signal line, and second
Pole is connected with the control gate of the driving transistor；
And, the second storage capacitance, first end is connected with the second pole of the second transistor, the second end ground connection.
As shown in figure 3, according to a kind of embodiment, the switch control unit includes the first transistor T1 and first
Storage capacitance C1, wherein,
The first transistor T1 is n-type transistor；
The first transistor T1, grid is connected with the scan line Scan, drain electrode be connected with data wire Data, source electrode and
Driving transistor TD signal grid connection；
The first storage capacitance C1, first end is connected with the source electrode of the first transistor T1, the second end and ground terminal GND
Connection；
The threshold control unit includes second transistor T2 and the second storage capacitance C2, wherein,
The second transistor T2 is n-type transistor；
The second transistor T2, grid is connected with the scan line Scan, drain electrode access programmable voltage modulated signal
Vadj, source electrode is connected with the control gate of the driving transistor TD；
The second storage capacitance C2, first end is connected with the source electrode of the second transistor T2, the second end and ground terminal GND
Connection；
In figure 3, A points are the node being connected with TD signal grid, and B points are the node being connected with TD control gate.
In practical operation, the first transistor T1 and/or second transistor T2 could alternatively be p-type transistor, only need by
Scanning signal is accordingly changed to that low level is effective, and transistor types are replaced by those skilled in the art's common technology hand
Section, will not be repeated here.
The operation principle of pixel-driving circuit described in specific embodiment as shown in Figure 3 is as follows：In each display cycle：
As shown in Figure 3A,
Scanning signal on pre-charging stage S1, scan line Scan is high level, the first transistor T1 and the second crystal
Pipe T2 is opened, and the first storage capacitance C1 is charged by the data-signal on data wire Data, passes through programmable voltage
Modulated signal Vadj charges to C2, the potential duration rise of the current potential and B points of A points, until T1 disconnects；
Scanning signal saltus step on glow phase S2, scan line Scan is low level, and the first transistor T1 and second is brilliant
Body pipe T2 is disconnected, and the first storage capacitance C1 maintains the current potential of driving transistor TD signal grid constant, i.e. the current potential of A points is maintained
It is constant；Driving transistor TD constant conductions are to drive OLED O1 to light, until next display cycle；Second storage capacitance C2
The current potential of maintenance driving transistor TD control gate is constant, i.e. the current potential of B points remains unchanged, to control driving transistor TD threshold
Threshold voltage is constant, until next display cycle；
Scanning signal saltus step on reseting stage S3, scan line Scan is the data letter on high level, data wire Data
Low level number is maintained until next display cycle, T1 and T2 are turned on, C1 and C2 start electric discharge, to cause TD letter
The current potential of the current potential of number grid and TD control gate resets.
Illustrate how to determine may be programmed for the threshold voltage unchanged for controlling driving transistor TD below by Fig. 4 and Fig. 5
Voltage modulation signal Vadj：
As shown in figure 4, the pixel-driving circuit described in the embodiment of the present invention is in the debugging stage, can in debugging stage Vadj
Programming, is finally given by multiple debugging and the uniform programmable voltages of threshold voltage vt h of floating transistor is modulated
Signal Vadj；
The uniform programmable voltage modulation of threshold voltage vt h that can cause floating transistor is determined as shown in figure 5, working as
After signal Vadj, control causes the pixel-driving circuit described in the embodiment of the present invention formally to start working.
It should be noted that Fig. 4 and Fig. 5 are each signals in debugging stage when choosing programmable voltage modulated signal Vadj
Timing diagram such as Fig. 4, can cause TD threshold voltage (the i.e. threshold in predetermined threshold voltage range by test of many times to choose
Drift is not present in threshold voltage), after tests determined optimal Vadj, in real work using the Vadj.
In figures 4 and 5, Vdata is the data-signal on data wire Data, and Vscan-1 is the first line scan signals,
Vscan-n is line n scanning signal, and n is the integer more than 1.
Image element driving method described in the embodiment of the present invention, the above-mentioned pixel-driving circuit for driving, including：Each
In display cycle,
When the scanning signal is effective, switch control unit control is by the data-signal by the letter of driving transistor
The current potential of number grid charges to predetermined switch controlling potential, when the scanning signal is invalid, and switch control unit control maintains institute
The current potential for stating the signal grid of driving transistor is predetermined switch controlling potential, is driven with controlling the driving transistor to turn on
OLED；
When the scanning signal is effective, threshold control unit control will be described by the programmable voltage modulated signal
The current potential of the control gate of driving transistor charges to predetermined threshold controlling potential, and control is maintained when the scanning signal is invalid
The current potential of the control gate of the driving transistor is predetermined threshold controlling potential, by the threshold voltage control of the driving transistor
System is in predetermined threshold voltage range.
Display panel described in the embodiment of the present invention, including data wire, scan line and light-emitting component, the scan line output
Scanning signal, the data wire outputting data signals；The display panel also includes above-mentioned pixel-driving circuit；
The switch element and control unit that the scan line includes with the pixel-driving circuit respectively are connected；
The switch element that the data wire includes with the pixel-driving circuit is connected；
Second pole of the driving transistor that the light-emitting component includes with the pixel-driving circuit is connected.
Display device described in the embodiment of the present invention includes above-mentioned display panel.
Display panel described in the embodiment of the present invention is preferably AMOLED (Active Matrix/Organic Light
Emitting Diode, active matrix organic light-emitting diode) display panel, the display device described in the embodiment of the present invention is preferred
For AMOLED display device.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of pixel-driving circuit, it is characterised in that including driving transistor, switch control unit and threshold control unit,
Wherein, the driving transistor is floating transistor；
The anode of the driving transistor, the first pole access driving voltage, the second pole and OLED is connected；
The switch control unit, is respectively connected to scanning signal and data-signal, and connect with the signal grid of the driving transistor
Connect, within each display cycle, when the scanning signal is effective, control is by the data-signal by the driving crystal
The current potential of the signal grid of pipe charges to predetermined switch controlling potential, and control maintains the driving when the scanning signal is invalid
The current potential of the signal grid of transistor is predetermined switch controlling potential, and the OLED is driven to control the driving transistor to turn on
Device；
The threshold control unit, is respectively connected to the scanning signal and programmable voltage modulated signal, and brilliant with the driving
The control gate connection of body pipe, within each display cycle, when the scanning signal is effective, control passes through described programmable
The current potential of the control gate of the driving transistor is charged to predetermined threshold controlling potential by voltage modulation signal, and in the scanning letter
The current potential for controlling to maintain the control gate of the driving transistor when number invalid is predetermined threshold controlling potential, and the driving is brilliant
The threshold voltage of body pipe is controlled in predetermined threshold voltage range；
The switch control unit includes：
The first transistor, grid accesses the scanning signal, and the data-signal is accessed in the first pole, and the second pole and the driving are brilliant
The signal grid connection of body pipe；
And, the first storage capacitance, first end is connected with the second pole of the first transistor, the second end ground connection；
The first transistor is n-type transistor.
2. pixel-driving circuit according to claim 1, it is characterised in that the threshold control unit includes：
Second transistor, grid accesses the scanning signal, and the programmable voltage modulated signal is accessed in the first pole, the second pole with
The control gate connection of the driving transistor；
And, the second storage capacitance, first end is connected with the second pole of the second transistor, the second end ground connection.
3. a kind of image element driving method, for driving the pixel driver electricity as described in any claim in claim 1 to 2
Road, it is characterised in that including：Within each display cycle,
When the scanning signal is effective, switch control unit control is by the data-signal by the signal grid of driving transistor
Current potential charge to predetermined switch controlling potential, when the scanning signal is invalid, switch control unit control maintain it is described drive
The current potential of the signal grid of dynamic transistor is predetermined switch controlling potential, and OLED devices are driven to control the driving transistor to turn on
Part；
When the scanning signal is effective, threshold control unit control is by the programmable voltage modulated signal by the driving
The current potential of the control gate of transistor charges to predetermined threshold controlling potential, and control remains described when the scanning signal is invalid
The current potential of the control gate of driving transistor is predetermined threshold controlling potential, and the threshold voltage control of the driving transistor is existed
In predetermined threshold voltage range.
4. a kind of display panel, including data wire, scan line and OLED, the scan line export scanning signal, the number
According to line outputting data signals；Characterized in that, the display panel also includes such as any claim institute in claim 1 to 2
The pixel-driving circuit stated；
The switch control unit and threshold control unit that the scan line includes with the pixel-driving circuit respectively are connected；
The switch control unit that the data wire includes with the pixel-driving circuit is connected；
Second pole of the driving transistor that the OLED includes with the pixel-driving circuit is connected.
5. a kind of display device, it is characterised in that including display panel as claimed in claim 4.
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| CN201410746117.4A CN104376815B (en) | 2014-12-08 | 2014-12-08 | Pixel-driving circuit, method, display panel and display device |
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| CN201410746117.4A CN104376815B (en) | 2014-12-08 | 2014-12-08 | Pixel-driving circuit, method, display panel and display device |
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| CN104376815B true CN104376815B (en) | 2017-09-22 |
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| CN111402799B (en) | 2020-04-09 | 2021-07-06 | 武汉天马微电子有限公司 | Light-emitting drive circuit and drive method, organic light-emitting display panel and device |
| CN114708834B (en) * | 2022-04-07 | 2023-02-28 | 天宜微电子(北京)有限公司 | Pixel circuit, driving method thereof and display panel |
| CN114822408B (en) * | 2022-05-31 | 2023-10-10 | 昆山国显光电有限公司 | Electronic tag, driving method thereof and picture updating system of electronic tag |
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| KR100873078B1 (en) * | 2007-04-10 | 2008-12-09 | 삼성모바일디스플레이주식회사 | Pixel, Organic Light Emitting Display Device and Driving Method Thereof |
| KR101341788B1 (en) * | 2007-07-09 | 2013-12-13 | 엘지디스플레이 주식회사 | Light lmitting display device and driving method thereof |
| CN103681767B (en) * | 2013-12-19 | 2017-01-04 | 中国科学院上海高等研究院 | AMOLED pixel-driving circuit, driving method and array drive system |
| CN103873791B (en) * | 2014-03-14 | 2017-01-25 | 中国科学院上海高等研究院 | Pixel unit read-out circuit and method, and pixel array read-out circuit and method |
| CN204229810U (en) * | 2014-12-08 | 2015-03-25 | 京东方科技集团股份有限公司 | Pixel-driving circuit, display panel and display device |
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