CN206249869U - Pixel-driving circuit, pixel cell and display device - Google Patents
Pixel-driving circuit, pixel cell and display device Download PDFInfo
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- CN206249869U CN206249869U CN201621340960.3U CN201621340960U CN206249869U CN 206249869 U CN206249869 U CN 206249869U CN 201621340960 U CN201621340960 U CN 201621340960U CN 206249869 U CN206249869 U CN 206249869U
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Abstract
The utility model provides a kind of pixel-driving circuit, pixel cell and display device.The pixel-driving circuit includes driving transistor, charge/discharge unit, luminous controling unit, data write control unit and charge-discharge control unit；The charge-discharge control unit is used to be connected with second electrical level output end in the first pole of the regulation of electrical circuit stage control driving transistor under the control of data wire, is connected with the grid of driving transistor at second end of charging stage and glow phase control charge/discharge unit under the control of the first scan line.The threshold voltage deviation that the utility model can be produced in elimination by process deviation, the space of circuit design is saved while the picture quality problems that solution current unevenness is caused, by increasing capacitance it is possible to increase pixel aperture ratio, reduce circuit signal line number amount, circuit cost is reduced, facilitates circuit design.
Description
Technical field
The utility model is related to pixel driver technical field, more particularly to a kind of pixel-driving circuit, pixel cell and aobvious
Showing device.
Background technology
Due to process deviation, driving TFT (the Thin Film in the pixel-driving circuit that display device includes
Transistor, thin film transistor (TFT)) threshold voltage can shift, cause different pixels driving current occur it is uneven
Phenomenon.Existing pixel-driving circuit can not save electricity while the threshold voltage deviation produced by process deviation is eliminated
The space of road design, is unable to increase pixel aperture ratio, reduces circuit signal line number amount, reduces circuit cost, convenient electricity
Design on road.
Utility model content
Main purpose of the present utility model is to provide a kind of pixel-driving circuit, pixel cell and display device, is solved
Existing pixel-driving circuit can not save circuit while the threshold voltage deviation produced by process deviation is eliminated and set
The problem in the space of meter.
In order to achieve the above object, the utility model provides a kind of pixel-driving circuit, including：
Driving transistor, the first pole is connected with light-emitting component；
Charge/discharge unit, first end is connected with the second pole of the driving transistor；
Luminous controling unit, respectively with the first scan line, the second pole of the driving transistor and the first level output end
Connection, under the control of the first scan line charging stage and glow phase control the driving transistor the second pole and
First level output end is connected；
Data write control unit, respectively the grid with data wire, the second scan line and the driving transistor be connected, use
In charging stage and the regulation of electrical circuit stage controlled under the control of the second scan line the grid of the driving transistor with it is described
Data wire is connected；And,
Charge-discharge control unit, exports with the data wire, the first pole of the driving transistor, second electrical level respectively
The grid connection of end, first scan line, the second end of the charge/discharge unit and the driving transistor, for described
Connect with the second electrical level output end in the first pole of driving transistor described in the regulation of electrical circuit stage control under the control of data wire
Connect, control the second end and the institute of the charge/discharge unit in charging stage and glow phase under the control of first scan line
State the grid connection of driving transistor.
During implementation, the luminous controling unit includes：Light emitting control transistor, grid is connected with first scan line,
First pole is connected with the first pole of the driving transistor, and the second pole is connected with first level terminal.
During implementation, the data write control unit includes：Data write controlling transistor, grid and the described second scanning
Line is connected, and the first pole is connected with the data wire, and the second pole is connected with the grid of the driving transistor.
During implementation, the charge-discharge control unit includes：First charge and discharge control transistor, grid connects with the data wire
Connect, the first pole is connected with the second electrical level output end, the second pole is connected with the first pole of the driving transistor；And,
Second charge and discharge control transistor, grid is connected with first scan line, the first pole and the driving transistor
Grid connection, the second pole is connected with the second end of the charge/discharge unit.
During implementation, the charge/discharge unit includes storage capacitance；
The first end of the storage capacitance is connected with the second pole of the driving transistor, and the storage capacitance is filled with described
Control of discharge unit is connected.
The utility model additionally provides a kind of pixel cell, including light-emitting component and above-mentioned pixel-driving circuit, described
Pixel-driving circuit is connected with the light-emitting component, drives the light-emitting component to light.
The utility model additionally provides a kind of display device, including above-mentioned pixel cell.
Compared with prior art, pixel-driving circuit described in the utility model, pixel cell and display device can be
The threshold voltage deviation that elimination is produced by process deviation, electricity is saved while the picture quality problems that solution current unevenness is caused
The space of road design, by increasing capacitance it is possible to increase pixel aperture ratio, reduces circuit letter input quantity, reduces circuit cost, facilitates circuit design.
Brief description of the drawings
Fig. 1 is the structure chart of the pixel-driving circuit described in the utility model embodiment；
Fig. 2 is the circuit diagram of a specific embodiment of pixel-driving circuit described in the utility model；
Fig. 3 is the working timing figure of the specific embodiment of the utility model pixel-driving circuit as shown in Figure 2；
Fig. 4 A are the electric current of the specific embodiment in charging stage T1 of the utility model pixel-driving circuit as shown in Figure 2
Flow to schematic diagram；
Fig. 4 B are the specific embodiments of the utility model pixel-driving circuit as shown in Figure 2 in the regulation of electrical circuit stage T2
Current direction schematic diagram；
Fig. 4 C are the electric current of the specific embodiment in glow phase T3 of the utility model pixel-driving circuit as shown in Figure 2
Flow to schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
As shown in figure 1, the pixel-driving circuit described in the utility model embodiment includes：
Driving transistor DTFT, the first pole is connected with light-emitting component 10；
Charge/discharge unit 11, first end is connected with second pole of the driving transistor DTFT；
Luminous controling unit 12, respectively with the first scan line Scan1, second pole and first of the driving transistor DTFT
Level output end VD1 is connected, for controlling the drive in charging stage and glow phase under the control of the first scan line Scan1
Second pole of dynamic transistor DTFT and the first level output end VD1 connections；
Data write control unit 13, respectively with data wire Data, the second scan line Scan2 and the driving transistor
The grid connection of DTFT, it is described for being controlled under the control of the second scan line Scan2 in charging stage and the regulation of electrical circuit stage
The grid of driving transistor DTFT is connected with the data wire Data；And,
Charge-discharge control unit 14, respectively with the data wire Data, the first pole, second of the driving transistor DTFT
Level output end VD2, the first scan line Scan1, the second end of the charge/discharge unit 11 and the driving transistor
DTFT grid connection, under the control of the data wire Data in driving transistor described in the regulation of electrical circuit stage control
First pole of DTFT is connected with the second electrical level output end VD2, in charging rank under the control of the first scan line Scan1
Section and glow phase control the second end of the charge/discharge unit 11 to be connected with the grid of the driving transistor DTFT.
In Fig. 1, so that DTFT is as n-type transistor as an example, but in practical operation, DTFT can also be p-type transistor,
Type at this to driving transistor is not construed as limiting.
The threshold value electricity that pixel-driving circuit described in the utility model embodiment can be produced in elimination by process deviation
Pressure deviation, saves the space of circuit design, by increasing capacitance it is possible to increase pixel is opened while the picture quality problems that solution current unevenness is caused
Mouth rate, reduces holding wire quantity, reduces circuit cost, facilitates circuit design.
Pixel-driving circuit described in the utility model embodiment from unlike existing common pixel-driving circuit
The transistor that charge and discharge control module includes directly is controlled by data wire Data, so as in the regulation of electrical circuit stage (namely data electricity
Pressure write phase) transistor turns are controlled so as to control first pole of driving transistor DTFT defeated with second electrical level by Data
Go out and hold VD2 to connect, the direct controlling transistors of Data are switched on and off, and by the first scan line Scan1 and the second scan line
The cooperation control of Scan2, saves holding wire quantity, reduces circuit cost, facilitates circuit design.
Specifically, the luminous controling unit includes：Light emitting control transistor, grid is connected with first scan line,
First pole is connected with the first pole of the driving transistor, and the second pole is connected with first level terminal.
Specifically, the data write control unit includes：Data write controlling transistor, grid and the described second scanning
Line is connected, and the first pole is connected with the data wire, and the second pole is connected with the grid of the driving transistor.
Specifically, the charge-discharge control unit includes：First charge and discharge control transistor, grid connects with the data wire
Connect, the first pole is connected with the second electrical level output end, the second pole is connected with the first pole of the driving transistor；And,
Second charge and discharge control transistor, grid is connected with first scan line, the first pole and the driving transistor
Grid connection, the second pole is connected with the second end of the charge/discharge unit.
Specifically, the charge/discharge unit includes storage capacitance, the first end of the storage capacitance and the driving crystal
The second pole connection of pipe, the storage capacitance is connected with the charge-discharge control unit.
In practical operation, when the transistor that DTFT and each unit include is n-type transistor, the first level output
End VD1 exports high level Vdd, Vdd >=Vdh (Vdh corresponds to the data voltage of maximum brightness), the second electrical level output end
VD2 is ground terminal GND.
As shown in Fig. 2 a specific embodiment of pixel-driving circuit described in the utility model is used to drive organic light emission
Diode OLED lights, and the specific embodiment of the pixel-driving circuit includes driving transistor DTFT, charge/discharge unit, luminous control
Unit processed, data write control unit and charge-discharge control unit, wherein,
The source electrode of the driving transistor DTFT is connected with the anode of Organic Light Emitting Diode OLED, Organic Light Emitting Diode
The negative electrode of OLED is connected with ground terminal GND；
The charge/discharge unit includes storage capacitance C1；The first end of the storage capacitance C1 and the driving transistor
The drain electrode connection of DTFT；
The luminous controling unit includes：Light emitting control transistor T1, grid is connected with the first scan line Scan1, source electrode
Drain electrode with the driving transistor DTFT is connected, and drain electrode accesses high level Vdd；
The data write control unit includes：Data write controlling transistor T2, and grid and the second scan line Scan2 connect
Connect, source electrode is connected with data wire Data, drain electrode is connected with the grid of the driving transistor DTFT；
The charge-discharge control unit includes：
First charge and discharge control transistor T3, grid is connected with the data wire Data, and source electrode is connected with ground terminal GND, leakage
Pole is connected with the source electrode of the driving transistor DTFT；And,
Second charge and discharge control transistor T4, grid is connected with the first scan line Scan1, and source electrode drives crystalline substance with described
The grid connection of body pipe DTFT, drain electrode is connected with second end of the storage capacitance C1.
As shown in figure 3, the specific embodiment of the utility model pixel-driving circuit as shown in Figure 2 is operationally,
High level is all exported in charging stage T1, Scan1 and Scan2, the data voltage of Data outputs is 0, T1, T2 and T4
All open, DTFT and T3 is closed, now, as shown in Figure 4 A, T1, C1, T4 and T2 constitute charging circuit, in current path such as Fig. 4 A
Shown in line with arrow, a point current potentials Va is charged into Vdd (first node that a points are connected with the first end of C1), b points electricity
Position is 0 (b points are the Section Point being connected with second end of C1) for Vb；
In the regulation of electrical circuit stage T2, (V1 ＜ Vscan1 ＜ V2, V1 reversely hit Scan1 output low-voltages Vscan1 for T1's
Voltage is worn, V2 closes the difference of voltage for the threshold voltage vt h and T1 of T1), to cause that T1 is closed, Scan2 output HIGH voltages
Vscan2 (high voltage Vscan the data voltage corresponding to minimum brightness and corresponding to maximum brightness data voltage Vdh it
Between), to cause that T2 is opened, Data output Vdata, Vdata is that high level, now T1 and T4 are all closed, and T2, DTFT and T3 beat
Open, such C1 can discharge, discharge path as shown in Figure 4 B, is discharged by C1, DTFT and T3, when the voltage Va of first node a drops
During to Vdata+Vth, C1 electric discharge cut-offs, Va-Vb=Vdata+Vth；
In circuit glow phase T3, Scan1 output high level, to cause that T1 is opened, Scan2 exports low level, to cause
T2 is closed, and the data voltage of Data outputs is 0, and now as shown in Figure 4 C, T1, T4 and DTFT are opened, and T2 and T3 are closed, c
The current potential Vb identical (c is the 3rd node being connected with the grid of DTFT) of current potential Vc and the b point of point, the current potential of a points and the electricity of c points
Difference between position remains Vdata+Vth, namely now the gate source voltage Vgs of DTFT remains Vdata+Vth, flows through DTFT
Driving current I=K × (Vgs-Vth)2=K × Vdata2, OLED will keep constant current to light, not by the threshold value electricity of DTFT
Pressure Vth influences, wherein, K is the current coefficient of DTFT.
The utility model implements the driving method of described pixel-driving circuit, is applied to above-mentioned pixel-driving circuit,
The driving method of the pixel-driving circuit includes：In each display cycle,
In the charging stage, data wire exports the 3rd level, and luminous controling unit controls to drive under the control of the first scan line
First pole of dynamic transistor and the connection of the first level output end, data write control unit are controlled under the control of the second scan line
The grid of driving transistor is connected with data wire, and charge-discharge control unit controls discharge and recharge under the control of first scan line
Second end of unit is connected with the grid of the driving transistor；
In the regulation of electrical circuit stage, data wire output data voltage Vdata, the control of data write control unit is described to drive crystalline substance
The grid of body pipe is connected with the data wire, and data write control unit controls the driving brilliant under the control of the second scan line
The grid of body pipe is connected with the data wire, and charge-discharge control unit controls the driving brilliant under the control of the data voltage
First pole of body pipe is connected with second electrical level output end, to control driving transistor conducting until charge/discharge unit electric discharge and
So that the potential difference of the current potential at the second end of the current potential of the first end of the charge/discharge unit and the charge/discharge unit is Vdata
+Vth；Vth is the threshold voltage of the driving transistor；
In glow phase, luminous controling unit controls the first pole of the driving transistor and the first level output end to connect
Connect, charge-discharge control unit controls the second end of the charge/discharge unit and the driving under the control of first scan line
The grid connection of transistor, is maintained Vdata+Vth so that the driving is brilliant with the gate source voltage for controlling the driving transistor
The conducting of body pipe compensates the threshold voltage of the driving transistor so as to the gate source voltage for controlling the driving transistor.
In practical operation, when the driving transistor is n-type transistor, the 3rd level and first level
Threshold voltage of the difference less than the driving transistor between first level of output end output, to control in charging stage institute
State driving transistor disconnection.
In practical operation, when the driving transistor is p-type transistor, the 3rd level and first level
Threshold voltage of the difference more than the driving transistor between first level of output end output, to control in charging stage institute
State driving transistor disconnection.
Pixel cell described in the utility model embodiment includes light-emitting component and above-mentioned pixel-driving circuit, the picture
Plain drive circuit is connected with the light-emitting component, drives the light-emitting component to light.
Display device described in the utility model embodiment includes above-mentioned pixel cell.It is described aobvious in practical operation
Showing device can be any device with display function, or display panel.The above is of the present utility model excellent
Select implementation method, it is noted that for those skilled in the art, do not depart from original described in the utility model
On the premise of reason, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection model of the present utility model
Enclose.
Claims (7)
1. a kind of pixel-driving circuit, it is characterised in that including：
Driving transistor, the first pole is connected with light-emitting component；
Charge/discharge unit, first end is connected with the second pole of the driving transistor；
Luminous controling unit, is connected with the first scan line, the second pole of the driving transistor and the first level output end respectively,
The second pole and first for controlling the driving transistor in charging stage and glow phase under the control of the first scan line
Level output end is connected；
Data write control unit, respectively the grid with data wire, the second scan line and the driving transistor be connected, for
Charging stage and the regulation of electrical circuit stage control the grid and the data of the driving transistor under the control of the second scan line
Line is connected；And,
Charge-discharge control unit, respectively with the data wire, the first pole of the driving transistor, second electrical level output end, institute
The grid connection of the first scan line, the second end of the charge/discharge unit and the driving transistor is stated, in the data
It is connected with the second electrical level output end in the first pole of driving transistor described in the regulation of electrical circuit stage control under the control of line,
Under the control of first scan line the second end of the charge/discharge unit and the drive are controlled in charging stage and glow phase
The grid connection of dynamic transistor.
2. pixel-driving circuit as claimed in claim 1, it is characterised in that the luminous controling unit includes：Light emitting control
Transistor, grid is connected with first scan line, and the first pole is connected with the first pole of the driving transistor, the second pole and institute
State the connection of the first level terminal.
3. pixel-driving circuit as claimed in claim 1, it is characterised in that the data write control unit includes：Data
Write-in controlling transistor, grid is connected with second scan line, and the first pole is connected with the data wire, the second pole and the drive
The grid connection of dynamic transistor.
4. pixel-driving circuit as claimed in claim 1, it is characterised in that the charge-discharge control unit includes：First fills
Control of discharge transistor, grid is connected with the data wire, and the first pole is connected with the second electrical level output end, the second pole and institute
State the first pole connection of driving transistor；And,
Second charge and discharge control transistor, grid is connected with first scan line, the grid of the first pole and the driving transistor
Pole connects, and the second pole is connected with the second end of the charge/discharge unit.
5. the pixel-driving circuit as described in any claim in Claims 1-4, it is characterised in that the discharge and recharge list
Unit includes storage capacitance；
The first end of the storage capacitance is connected with the second pole of the driving transistor, the storage capacitance and the discharge and recharge
Control unit is connected.
6. a kind of pixel cell, it is characterised in that including light-emitting component and as described in any claim in claim 1 to 5
Pixel-driving circuit, the pixel-driving circuit is connected with the light-emitting component, drives the light-emitting component to light.
7. a kind of display device, it is characterised in that including pixel cell as claimed in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621340960.3U CN206249869U (en) | 2016-12-08 | 2016-12-08 | Pixel-driving circuit, pixel cell and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621340960.3U CN206249869U (en) | 2016-12-08 | 2016-12-08 | Pixel-driving circuit, pixel cell and display device |
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| CN206249869U true CN206249869U (en) | 2017-06-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106448567A (en) * | 2016-12-08 | 2017-02-22 | 合肥鑫晟光电科技有限公司 | Pixel drive circuit, drive method, pixel unit and display device |
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2016
- 2016-12-08 CN CN201621340960.3U patent/CN206249869U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106448567A (en) * | 2016-12-08 | 2017-02-22 | 合肥鑫晟光电科技有限公司 | Pixel drive circuit, drive method, pixel unit and display device |
| CN106448567B (en) * | 2016-12-08 | 2020-06-05 | 合肥鑫晟光电科技有限公司 | Pixel driving circuit, driving method, pixel unit and display device |
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