CN104282263A - Pixel circuit, drive method thereof, display panel and display device - Google Patents
Pixel circuit, drive method thereof, display panel and display device Download PDFInfo
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- CN104282263A CN104282263A CN201410498251.7A CN201410498251A CN104282263A CN 104282263 A CN104282263 A CN 104282263A CN 201410498251 A CN201410498251 A CN 201410498251A CN 104282263 A CN104282263 A CN 104282263A
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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]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- 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]
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The invention provides a pixel circuit. The pixel circuit comprises a power source end, a power source conductive transistor, a drive transistor, a light-emitting piece, a reset module, a storage capacitor and a compensation module. The first end of the compensation module is connected with the data writing-in end of the pixel circuit. The second end of the compensation module is connected with the grid electrode of the drive transistor. The third end of the compensation module is connected with the first electrode of the drive transistor. The fourth end of the compensation module and the second electrode of the drive transistor. The second end of the storage capacitor is connected with the first electrode of the drive transistor through the compensation module. The compensation module can output the data voltage input by the data writing-in end at the fourth end of the compensation module after the reset stage of the pixel circuit is ended and charge the storage capacitor through the data voltage so as to compensate for the threshold voltage of the drive transistor. The invention further provides a drive method of the pixel circuit, a display panel and a display device. The luminance is even when the display panel conducts display.
Description
Technical field
The present invention relates to organic light-emitting diode display field, particularly, relate to a kind of image element circuit, this image element circuit driving method, a kind ofly comprise the display panel of described image element circuit and a kind of display device comprising this display panel.
Background technology
Organic light emitting display is one of focus of current flat-panel monitor research field, compared with liquid crystal display, Organic Light Emitting Diode has that low energy consumption, production cost are low, autoluminescence, the advantage such as wide viewing angle and fast response time, at present, in display fields such as mobile phone, PDA, digital cameras, start to adopt organic LED display panel to replace traditional display panels.Pixel-driving circuit design is active matrix organic light-emitting diode display panel (AMOLED) core technology content, has important Research Significance.
Different from utilizing stable Control of Voltage brightness in liquid crystal panel, Organic Light Emitting Diode belongs to electric current and drives, and needs stable electric current to control luminescence.
Shown in Fig. 1 is a kind of conventional 2T1C image element circuit, and this image element circuit comprises memory capacitance C, driving transistors DTFT and switching transistor T0.When sweep trace scanning one-row pixels, switching transistor T0 conducting, data write signal (herein, data write signal is voltage) write memory capacitance C, at the end of this line scanning, switching transistor T0 closes, and is stored in driving transistors DTFT described in the voltage driven in memory capacitance C, make it produce drives illuminating part OLED, ensure illuminating part continuous illumination in a frame.The saturation current of driving transistors DTFT is I
oLED=K (V
gS-V
th)
2.Wherein, I
oLEDfor the saturation current of driving transistors DTFT, V
gSfor the gate source voltage of driving transistors DTFT, V
thfor the threshold voltage of driving transistors DTFT.
Due to the reason such as manufacturing process and device aging, there is unevenness in the threshold voltage of the driving transistors of each pixel, which results in the electric current flowing through Organic Light Emitting Diode in each pixel to change and make display brightness uneven, thus affect the display effect of whole image.
Therefore, the brightness uniformity how improving display panel becomes this area technical matters urgently to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide the driving method of a kind of image element circuit, this image element circuit a kind of, a kind ofly comprise the display panel of described image element circuit and a kind of display device comprising described display panel.The display panel display brightness comprising described image element circuit is even.
To achieve these goals, as one aspect of the present invention, provide a kind of image element circuit, described image element circuit comprises power end, power supply conductivity transistor, driving transistors, illuminating part, replacement module, memory capacitance and compensating module,
The first end of described memory capacitance is connected with described power end, and the second end of described memory capacitance is connected with the grid of described driving transistors;
First pole of described power supply conductivity transistor is connected with described power end, and described power supply conductivity transistor can in the glow phase conducting of described image element circuit;
First pole of described driving transistors is extremely connected with second of described power supply conductivity transistor;
Described replacement module is connected with the grid of described driving transistors, is reset by the grid voltage of described driving transistors with the reset phase at described image element circuit;
The first end of described compensating module writes to hold with the data of described image element circuit and is connected, second end of described compensating module is connected with the grid of described driving transistors, 3rd end of described compensating module is extremely connected with first of described driving transistors, 4th end of described compensating module is extremely connected with second of described driving transistors, and the second end of described memory capacitance is extremely connected with first of driving transistors by described compensating module, described compensating module can after the reset phase of described image element circuit terminates, the data voltage of described data write end input is exported at the 4th end of described compensating module, and utilize described data voltage to charge to described memory capacitance, to compensate the threshold voltage of described driving transistors.
Preferably, described compensating module comprises the first compensation transistor and the second compensation transistor, first pole of described first compensation transistor is connected with the second end of described memory capacitance, second pole of described first compensation transistor is extremely connected with first of described driving transistors, first pole of described second compensation transistor writes to hold with the data of described image element circuit and is connected, second pole of described second compensation transistor is extremely connected with second of described driving transistors, described first compensation transistor can in described compensated stage conducting, and close at described reset phase and described glow phase, and described second compensation transistor can in described compensated stage conducting, and close at described reset phase and described glow phase.
Preferably, described image element circuit comprises the first sweep signal end, the grid of described first compensation transistor and the grid of described second compensation transistor are all connected with described first sweep signal end, and described first compensation transistor is identical with the type of described second compensation transistor.
Preferably, described replacement module also comprises reset transistor and reset voltage end, first pole of described reset transistor is connected with described reset voltage end, second pole of described reset transistor is connected with the grid of described driving transistors, described reset transistor can in the reset phase conducting of described image element circuit, and closes at the compensated stage of described image element circuit and glow phase.
Preferably, described image element circuit comprises the second sweep signal end, and described second sweep signal end is connected with the grid of described reset transistor.
Preferably, described image element circuit also comprises illuminating part and controls transistor, the first pole that described illuminating part controls transistor is connected with the anode of described illuminating part, the second pole that described illuminating part controls transistor is extremely connected with second of described driving transistors, described illuminating part controls transistor and can close at the reset phase of described image element circuit and compensated stage, and in the glow phase conducting of described image element circuit.
Preferably, described image element circuit also comprises illumination scan signal end, the grid that the grid of described power supply conductivity transistor and described illuminating part control transistor is all connected with described illumination scan signal end, and the type of described power supply conductivity transistor is identical with the type that described illuminating part controls transistor.
Preferably, described power supply conductivity transistor, described driving transistors, described first compensation transistor and described second compensation transistor are P-type crystal pipe.
As another aspect of the present invention, provide a kind of display panel, described display panel comprises image element circuit, and wherein, described image element circuit is above-mentioned image element circuit provided by the present invention.
As another aspect of the invention, provide a kind of driving method of image element circuit, wherein, described image element circuit is above-mentioned image element circuit provided by the present invention, and described driving method comprises:
Reset step: at the reset phase of described image element circuit, utilize described replacement module to export reset voltage to the grid of described driving transistors;
The compensation process carried out after described replacement step terminates: at compensated stage, data write signal and sweep signal effective, described memory capacitance is charged, to compensate the threshold voltage of described driving transistors by the data write signal of described compensating module by the input of described data write end;
Light emitting step: in glow phase, LED control signal is effective, and described power supply conductivity transistor and described driving transistors are opened thus driven illuminating part luminous.
Preferably, described compensating module comprises the first compensation transistor, the first sweep signal end that second compensation transistor is connected with the grid of described first compensation transistor and the grid of described second compensation transistor, first pole of described first compensation transistor is connected with the second end of described memory capacitance, second pole of described first compensation transistor is extremely connected with first of described driving transistors, first pole of described second compensation transistor writes to hold with the data of described image element circuit and is connected, second pole of described second compensation transistor is extremely connected with second of described driving transistors,
In described compensation process, input the first sweep signal to described first sweep signal end, to control described first compensation transistor and synchronously conducting or the closedown of described second compensation transistor.
Preferably, described replacement module comprises reset transistor and reset voltage end, and the first pole of described reset transistor is connected with described reset voltage end, and the second pole of described reset transistor is connected with the grid of described driving transistors, the grid of described reset transistor is connected with the second sweep signal end
In described replacement step, the grid to described reset transistor inputs the second sweep signal, to control the reset phase conducting of reset transistor at described image element circuit.
Preferably, described image element circuit also comprises illuminating part and controls transistor, the first pole that described illuminating part controls transistor is connected with the anode of described illuminating part, the second pole that described illuminating part controls transistor is extremely connected with second of described driving transistors, described image element circuit also comprises illumination scan signal end, the grid that the grid of described power supply conductivity transistor and described illuminating part control transistor is all connected with described illumination scan signal end
In described light emitting step, to described illumination scan signal end input illumination scan signal, control transistor close at the reset phase of described image element circuit and compensated stage to control described illuminating part, and in the glow phase conducting of described image element circuit.
As an also aspect of the present invention, provide a kind of display device, this display device comprises above-mentioned display panel provided by the present invention.
In image element circuit provided by the present invention, the threshold voltage shift eliminating driving transistors is on the impact of electric current flowing through illuminating part, the brightness uniformity of the display panel comprising described image element circuit can be improved, and make described display panel can not produce the display defects such as ghost when showing, and then optimize the display effect of display panel.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the circuit diagram of existing 2T1C image element circuit;
Fig. 2 is the module diagram of image element circuit provided by the present invention;
Fig. 3 is the schematic diagram of the image element circuit that the preferred embodiment of the present invention provides;
Fig. 4 is when driving image element circuit provided by the present invention, the sequential chart of each signal;
Fig. 5 is the equivalent circuit diagram of the image element circuit shown in Fig. 3 at reset phase;
Fig. 6 is the equivalent circuit diagram of the image element circuit shown in Fig. 3 at compensated stage;
Fig. 7 is the equivalent circuit diagram of the image element circuit shown in Fig. 3 in glow phase.
Description of reference numerals
T1: power supply conductivity transistor T2: the first compensation transistor
T3: reset transistor T4: the second compensation transistor
T5: illuminating part controls transistor C: memory capacitance
DTFT: driving transistors OLED: illuminating part
Em: illumination scan signal end Scan [1]: the first sweep trace
Scan [2]: second sweep trace V
dd: power end
T0: switching transistor
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
As shown in Figure 2, as one aspect of the present invention, provide a kind of image element circuit, described image element circuit comprises power end V
dd, power supply conductivity transistor T1, driving transistors DTFT, illuminating part OLED, memory capacitance C and reset module.
The first end of memory capacitance C and power end V
ddbe connected, second end of memory capacitance C is connected with the grid of driving transistors DTFT.First pole of power supply conductivity transistor T1 and power end V
ddbe connected, and power supply conductivity transistor T1 can in the glow phase of described image element circuit (stage 3 in Fig. 4) conducting, and close at the reset phase (stage 1 in Fig. 4) of described image element circuit and compensated stage (stage 2 in Fig. 4).First pole of driving transistors DTFT is extremely connected with second of power supply conductivity transistor T1.
Described replacement module is connected with the grid of driving transistors DTFT, is reset by the grid voltage of described driving transistors with the reset phase at described image element circuit.
Described image element circuit also comprises compensating module, the first end 1 of described compensating module writes to hold with the data of described image element circuit and is connected, second end 2 of described compensating module is connected with the grid of driving transistors DTFT, 3rd end 3 of described compensating module is extremely connected with first of driving transistors DTFT, and the 4th end 4 of described compensating module is extremely connected with second of driving transistors DTFT.As shown in Figure 2, second end of memory capacitance C is connected with the second end 2 of described compensating module, second end of memory capacitance C is extremely connected with second of driving transistors DTFT by described compensating module, make described compensating module after the reset phase of described image element circuit terminates, the data voltage V of described data write end input can be exported at the 4th end of described compensating module
data, and utilize described data voltage V
datamemory capacitance C is charged, to compensate the threshold voltage of described driving transistors DTFT.
The source electrode and the drain electrode that one skilled in the art will appreciate that driving transistors DTFT are not changeless.First pole of driving transistors DTFT both can be the source electrode of this driving transistors DTFT, also can be the drain electrode of this driving transistors DTFT, correspondingly, second pole of driving transistors DTFT both can be the drain electrode of this driving transistors DTFT, also can be the source electrode of this driving transistors DTFT.In the energized state, the one of the extremely middle access high level in first pole of driving transistors DTFT and second is the source electrode of driving transistors DTFT, accesses the drain electrode that low level one is driving transistors DTFT.
Particularly, if the first pole access high level of driving transistors DTFT, and the second pole access low level of driving transistors DTFT, the so source electrode of first of driving transistors DTFT the very driving transistors DTFT, the drain electrode of second very this driving transistors DTFT of driving transistors DTFT.Otherwise, if the first pole access low level of driving transistors DTFT, and the second pole access high level of driving transistors DTFT, the so drain electrode of first of driving transistors DTFT the very driving transistors DTFT, the source electrode of second very this driving transistors DTFT of driving transistors DTFT.
In the present invention, first pole of other transistors (comprise power supply conductivity transistor the T1 above and first compensation transistor T2 that hereinafter will describe, the second compensation transistor T4, reset transistor T3 and illuminating part control transistor T5) and the implication of the second pole and the implication of driving transistors first pole and the second pole similar.
It is easily understood that at reset phase, the gate voltage signal of driving transistors DTFT is reset, be set to the unblocked level of this driving transistors DTFT at the level of the grid of driving transistors DTFT.Herein, being meant to of unblocked level, first pole and second of driving transistors DTFT extremely in one access high level another one access low level situation under, the level of driving transistors DTFT conducting can be made.
After reset phase terminates, described image element circuit enters compensated stage, at this compensated stage, by data voltage by compensating module writing pixel circuit.In this stage, the 4th end of described compensating module exports data voltage V
data, namely the current potential of second pole of driving transistors DTFT is maintained V by the 4th end of described compensating module by described data write end all the time
data, first pole of driving transistors DTFT is connected with second end of memory capacitance C, charges to memory capacitance.Because the grid of driving transistors DTFT is connected with second end of memory capacitance C, therefore, while described data input pin charges to memory capacitance C, also the grid of driving transistors DTFT is charged, when the current potential of the grid by driving transistors DTFT is drawn high to V
data-V
thtime, the potential difference (PD) between the grid of driving transistors DTFT and the second pole is V
th, that is, the gate source voltage VGS of driving transistors DTFT is V
th, be now in the critical conditions of driving transistors, when continuing charging, the grid potential of driving transistors DTFT slightly raises, and driving transistors DTFT can be made to disconnect, charge complete, and the grid voltage of driving transistors DTFT can be maintained V by memory capacitance C
data-V
th.
After the compensated stage of described image element circuit terminates, described image element circuit enters glow phase, power supply conductivity transistor T1 conducting, and driving transistors DTFT conducting, to form the electric current by illuminating part OLED.Now, the grid voltage of driving transistors DTF is V
data-V
th, and driving transistors DTFT first pole tension is V
dd, therefore, in glow phase, the gate source voltage V of driving transistors DTFT
gS=V
dd-(V
data-V
th).
The electric current by illuminating part OLED is calculated by following formula (1):
I
OLED＝K(V
GS-V
th)
2 (1)
＝K[V
dd-(V
data-V
th)-V
th]
2
＝K(V
dd-V
data)
2
Wherein, V
gSfor the gate source voltage of driving transistors DTFT, V
thfor the threshold voltage of driving transistors DTFT.
From above formula, the voltage V that the size of current flowing through illuminating part OLED only provides with power end
ddand the voltage V of data terminal input
datarelevant, be no longer subject to the threshold voltage V of driving transistors DTFT
thimpact.
It can thus be appreciated that even if the threshold voltage of driving transistors DTFT drifts about, the electric current flowing through illuminating part OLED also can not change.Namely, in image element circuit provided by the present invention, the threshold voltage shift eliminating driving transistors DTFT is on the impact of electric current flowing through illuminating part OLED, thus the brightness uniformity of the display panel comprising described image element circuit can be improved, and make described display panel can not produce the display defects such as ghost when showing, and then optimize the display effect of display panel.
As a kind of preferred implementation of the present invention, as shown in Figure 3, described compensating module can comprise the first compensation transistor T2 and the second compensation transistor T4, first pole (being equivalent to the second end of described compensating module) of the first compensation transistor T2 is connected with second end of memory capacitance C, second pole (being equivalent to the 3rd end of described compensating module) of the first compensation transistor T2 is extremely connected with first of driving transistors DTFT, first pole (being equivalent to the first end of described compensating module) of the second compensation transistor T4 writes to hold with the data of described image element circuit and is connected, second pole (being equivalent to the 4th end of described compensating module) of the second compensation transistor T4 is extremely connected with second of driving transistors DTFT, first compensation transistor T2 can in the compensated stage conducting of described image element circuit, and close at described reset phase and described glow phase, and the second compensation transistor T4 can in described compensated stage conducting, and close at described reset phase and described glow phase.
Particularly, at compensated stage, the first compensation transistor T2 and the second compensation transistor T4 conducting, now, the current potential of second pole of driving transistors DTFT is V all the time
data, data input pin charges to driving transistors DTFT, when the current potential of the grid by driving transistors DTFT is drawn high to V
data-V
thtime, the potential difference (PD) between the grid of driving transistors DTFT and the second pole is V
th, charge complete, the grid voltage of driving transistors DTFT can be maintained V by memory capacitance C
data-V
th.
In the present invention, respectively control end can be set at the grid of the first compensation transistor T2 and the grid of the second compensation transistor T4, to close at reset phase and glow phase by providing control signal to realize the first compensation transistor T2 and the second compensation transistor T4 respectively to the grid of the first compensation transistor T2 and the grid of the second compensation transistor T4, and in compensated stage conducting.
From description above, synchronous during the opening and closing of the first compensation transistor T2 and the second compensation transistor T4, in order to simplify the structure of image element circuit, preferably, described image element circuit comprises the first sweep signal end, the grid of described first compensation transistor and the grid of described second compensation transistor are all connected with described first sweep signal end, and in this embodiment, the first compensation transistor T2 is identical with the type of the second compensation transistor T4.That is, the first compensation transistor T2 and the second compensation transistor T4 is all N-type transistor, or is all P-type crystal pipe.
In order to realize providing replacement level at reset phase to driving transistors DTFT, preferably, described image element circuit also comprises reset transistor T3 and reset voltage end V
com, first pole of described reset transistor T3 and reset voltage end V
combe connected, second pole of reset transistor T3 is connected with the grid of driving transistors DTFT, and reset transistor T3 in the reset phase conducting of described image element circuit, and can close at the compensated stage of described image element circuit and glow phase.
Can in the reset phase conducting of described image element circuit in order to realize reset transistor T3, and can close at the compensated stage of described image element circuit and glow phase, preferably, described image element circuit can comprise the second sweep signal end, and described second sweep signal end is connected with the grid of reset transistor T3.
As a kind of preferred implementation of the present invention, as shown in Figure 3, described image element circuit can also comprise illuminating part and control transistor T5, the first pole that this illuminating part controls transistor T5 is connected with the anode of illuminating part OLED, the second pole that illuminating part controls transistor T5 is extremely connected with second of driving transistors DTFT, illuminating part controls transistor T5 and can close at the reset phase of image element circuit and compensated stage, and in the glow phase conducting of described image element circuit.
Close at the reset phase of image element circuit and compensated stage because illuminating part controls transistor T5, thus can prevent there is electric current by illuminating part OLED at reset phase and compensated stage, thus extend the serviceable life of illuminating part OLED.
As noted before, power supply conductivity transistor T1, in the glow phase conducting of described image element circuit, all closes at the reset phase of image element circuit and compensated stage.It can thus be appreciated that the conducting of power supply conductivity transistor T1 and closing timing and illuminating part control the conducting of transistor T5 and closing timing is synchronous.
In the present invention, in order to realize the synchro control of power supply conductivity transistor T1 and illuminating part control transistor T5 with simple structure, preferably, described image element circuit can also comprise illumination scan signal end, the grid that the grid of power supply conductivity transistor T1 and illuminating part control transistor T5 is all connected with described illumination scan signal end, in this embodiment, power supply conductivity transistor T1 is identical with the type that illuminating part controls transistor T5.That is, power supply conductivity transistor T1 and illuminating part control transistor T5 can be all N-type transistor or be all P-type crystal pipe.
In the present invention, not special to the concrete form of each transistor restriction.Such as, as a kind of embodiment of the present invention, power supply conductivity transistor T1, driving transistors DTFT, the first compensation transistor T2 and the second compensation transistor T4 can be all P-type crystal pipe, and further, it is also P-type crystal pipe that reset transistor T3 and illuminating part control transistor T5.
As another aspect of the present invention, provide the driving method of above-mentioned image element circuit provided by the present invention, described driving method comprises:
Reset step: at the reset phase (stage 1 in Fig. 4) of described image element circuit, utilize described replacement module to export reset voltage to the grid of described driving transistors;
The compensation process carried out after described replacement step terminates: at compensated stage (stage 2 in Fig. 4), data write signal and sweep signal effective, described memory capacitance is charged, to compensate the threshold voltage of described driving transistors by the data write signal of described compensating module by the input of described data write end;
Light emitting step: in glow phase (stage 3 in Fig. 4), LED control signal is effective, and described power supply conductivity transistor and described driving transistors are opened thus driven illuminating part luminous.
In driving image element circuit provided by the present invention, the threshold voltage shift eliminating driving transistors DTFT is on the impact of electric current flowing through illuminating part OLED, thus make described display panel the display defects such as ghost can not be produced when showing, and then optimize the display effect of display panel.
In described compensation process, charged to memory capacitance by data write signal, with the threshold voltage of compensation for drive transistor, do not need the compensating signal introducing other, therefore, image element driving method provided by the present invention is comparatively simple.
As noted before, in order to simplify the structure of image element circuit, described image element circuit comprises the first sweep signal end, the grid of the first compensation transistor T2 and the grid of the second compensation transistor T4 are all connected with described first sweep signal end, and the first compensation transistor T2 is identical with the type of the second compensation transistor T4.Correspondingly, the display panel comprising described image element circuit comprises the first sweep trace Scan [1], and this first sweep trace Scan [1] is connected with described first sweep signal end, to input the first sweep signal to described first sweep signal end.
Therefore, described driving method comprises: in described compensation process, provides the first sweep signal by the first sweep trace Scan [1] to the first sweep signal end, to control the first compensation transistor T2 and the second compensation transistor T4 synchronously conducting or closedown.As one embodiment of the present invention, first compensation transistor T2 and the second compensation transistor T4 is P-type crystal pipe, therefore, as shown in Figure 4, first sweep trace Scan [1] can export high level signal at reset phase and glow phase, control the first compensation transistor T2 and the second compensation transistor T4 closes, and the first sweep trace Scan [1] at compensated stage output low level signal, can control the first compensation transistor T2 and the second compensation transistor T4 conducting.
As noted before, reset for the ease of controlling described image element circuit, preferably, described replacement module can comprise reset transistor T3 and reset voltage end, first pole of reset transistor T3 is connected with described reset voltage end, second pole of reset transistor T3 is connected with the grid of driving transistors DTFT, and the grid of reset transistor T3 is connected with the second sweep signal end.Correspondingly, described driving method comprises: in described replacement step, grid to reset transistor T3 inputs the second sweep signal, control the reset transistor T3 reset phase conducting at described image element circuit, and control reset transistor T3 and close at the compensated stage of described image element circuit and glow phase.
In order to realize the replacement of described image element circuit, image element circuit comprises the second sweep signal end, described second sweep signal end is connected with the grid of reset transistor T3, correspondingly, the display panel comprising described image element circuit also comprises the second sweep trace Scan [2], this second sweep trace Scan [2] is connected with described second sweep signal end, thinks that described second sweep signal end provides the second sweep signal.Therefore, described driving method comprises: in described replacement step, inputs the second sweep signal to described reset voltage end, to control the reset phase conducting of reset transistor at described image element circuit.
Conducting and the closedown of signal control reset transistor T3 are provided to described second sweep signal end by the second sweep trace Scan [2].In embodiment provided by the present invention, reset transistor T3 can be P-type crystal pipe, therefore, the second sweep trace Scan [2] provides the low level making reset transistor T3 conducting at reset phase, exports at compensated stage and glow phase the high level that reset transistor T3 is closed.
As a kind of preferred implementation of the present invention, described image element circuit also comprises illuminating part and controls transistor T5, the first pole that this illuminating part controls transistor T5 is connected with the anode of illuminating part OLED, the second pole that illuminating part controls transistor T5 is extremely connected with second of driving transistors DTFT, illuminating part controls transistor T5 and can close at the reset phase of described image element circuit and compensated stage, and closes in the glow phase of described image element circuit.
Correspondingly, described driving method can comprise: in described light emitting step, to described illumination scan signal end input illumination scan signal, control transistor close at the reset phase of described image element circuit and compensated stage to control described illuminating part, and in the glow phase conducting of described image element circuit.
In order to simplify the structure of image element circuit, preferably, described image element circuit also comprises illumination scan signal end, the grid that the grid of power supply conductivity transistor T1 and illuminating part control transistor T5 is all connected with described illumination scan signal end, in this case, power supply conductivity transistor T1 is identical with the type that illuminating part controls transistor T5.Correspondingly, often organize described sweep trace and also comprise illumination scan signal wire Em, illumination scan signal wire Em is connected with described illumination scan signal end.Export illumination scan signal by illumination scan line Em to described illumination scan signal end, control the opening and closing of power supply conductivity transistor T1 and illuminating part control transistor T5.
In embodiments of the present invention, power supply conductivity transistor T1 and illuminating part control transistor T5 and are P-type crystal pipe, and therefore, illumination scan line Em, at reset phase and compensated stage output low level signal, exports high level signal in glow phase.
As noted before, power supply conductivity transistor T1, driving transistors DTFT, the first compensation transistor T2 and the second compensation transistor T4 can be all P-type crystal pipe, and further, it is also P-type crystal pipe that reset transistor T3 and illuminating part control transistor T5.
The driving method of the display base plate of the image element circuit of preferred implementation provided by the present invention is comprised below in conjunction with Fig. 3 to Fig. 7 introduction.
Image element circuit is in figure 3 5T1C image element circuit, only used 5 transistors and an electric capacity, therefore, effectively can improve the aperture opening ratio of image element circuit in this image element circuit.Further, in the image element circuit in figure 3, the transistor used is the P-type crystal pipe of low level conducting.In Fig. 5 to Fig. 7 shown in arrow is the flow direction of electric current, the part of the part that dotted line represents for not having electric current to pass through.
Reset step: the reset phase in Figure 5, the second sweep trace Scan [2], to described second control end output low level signal, controls reset transistor T3 conducting, thus writes reset voltage V to the grid of driving transistors DTFT
com.In this stage, the first sweep trace Scan [1] and illumination scan signal wire Em all exports high level, and therefore, power supply conductivity transistor T1, light emitting control transistor T5, the first compensation transistor T2 and the second compensation transistor T4 all close.
Compensation process: the compensated stage in figure 6, data line write data-signal V
data, the first sweep trace Scan [1] output low level signal controls the first compensation transistor T2 and the second compensation transistor T4 conducting, and the grid due to driving transistors DTFT is the reset voltage V of reset phase write
com, therefore, now driving transistors DTFT is also conducting, now, the grid voltage of driving transistors DTFT can be changed into V
data-V
th.In this stage, the second sweep trace Scan [2] and illumination scan signal wire Em all exports high level, and therefore, power supply conductivity transistor T1, light emitting control transistor T5 and reset transistor T3 all close.
Light emitting step: the glow phase in the figure 7, illumination scan signal wire Em output low level, makes power supply conductivity transistor T1 and light emitting control transistor T5 open, and therefore, illuminating part OLED can be luminous.Now, the first sweep trace Scan [1] and the second sweep trace Scan [2] all exports high level, and therefore, the first compensation transistor T2, the second compensation transistor T4 and reset transistor T3 all close.As noted before, flow through the electric current I of illuminating part OLED
oLEDcan following formulae discovery be passed through:
I
OLED＝K(V
GS-V
th)
2
＝K[V
dd-(V
data-V
th)-V
th]
2
＝K(V
dd-V
data)
2
As shown from the above formula, the voltage V that the size of current flowing through illuminating part OLED only provides with power end
ddand the voltage V of data terminal input
datarelevant, be no longer subject to the threshold voltage V of driving transistors DTFT
thimpact.
As another aspect of the invention, provide a kind of display panel, described display panel comprises image element circuit, and wherein, described image element circuit is above-mentioned image element circuit provided by the present invention.
Described display panel luminosity is even, and there is not the display defects such as ghost, can show high-quality image.
As an also aspect of the present invention, provide a kind of display device, this display device comprises above-mentioned display panel provided by the present invention.Display device of the present invention can be in TV, computer display screen, mobile phone etc.
Be understandable that, the illustrative embodiments that above embodiment is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (14)
1. an image element circuit, is characterized in that, described image element circuit comprises power end, power supply conductivity transistor, driving transistors, illuminating part, replacement module, memory capacitance and compensating module,
The first end of described memory capacitance is connected with described power end, and the second end of described memory capacitance is connected with the grid of described driving transistors;
First pole of described power supply conductivity transistor is connected with described power end, and described power supply conductivity transistor can in the glow phase conducting of described image element circuit;
First pole of described driving transistors is extremely connected with second of described power supply conductivity transistor;
Described replacement module is connected with the grid of described driving transistors, is reset by the grid voltage of described driving transistors with the reset phase at described image element circuit;
The first end of described compensating module writes to hold with the data of described image element circuit and is connected, second end of described compensating module is connected with the grid of described driving transistors, 3rd end of described compensating module is extremely connected with first of described driving transistors, 4th end of described compensating module is extremely connected with second of described driving transistors, and the second end of described memory capacitance is extremely connected with first of driving transistors by described compensating module, described compensating module can after the reset phase of described image element circuit terminates, the data voltage of described data write end input is exported at the 4th end of described compensating module, and utilize described data voltage to charge to described memory capacitance, to compensate the threshold voltage of described driving transistors.
2. image element circuit according to claim 1, it is characterized in that, described compensating module comprises the first compensation transistor and the second compensation transistor, first pole of described first compensation transistor is connected with the second end of described memory capacitance, second pole of described first compensation transistor is extremely connected with first of described driving transistors, first pole of described second compensation transistor writes to hold with the data of described image element circuit and is connected, second pole of described second compensation transistor is extremely connected with second of described driving transistors, described first compensation transistor can in described compensated stage conducting, and close at described reset phase and described glow phase, and described second compensation transistor can in described compensated stage conducting, and close at described reset phase and described glow phase.
3. image element circuit according to claim 2, it is characterized in that, described image element circuit comprises the first sweep signal end, the grid of described first compensation transistor and the grid of described second compensation transistor are all connected with described first sweep signal end, and described first compensation transistor is identical with the type of described second compensation transistor.
4. image element circuit as claimed in any of claims 1 to 3, it is characterized in that, described replacement module comprises reset transistor and reset voltage end, first pole of described reset transistor is connected with described reset voltage end, second pole of described reset transistor is connected with the grid of described driving transistors, described reset transistor can in the reset phase conducting of described image element circuit, and closes at the compensated stage of described image element circuit and glow phase.
5. image element circuit according to claim 4, is characterized in that, described image element circuit comprises the second sweep signal end, and described second sweep signal end is connected with the grid of described reset transistor.
6. image element circuit as claimed in any of claims 1 to 3, it is characterized in that, described image element circuit also comprises illuminating part and controls transistor, the first pole that described illuminating part controls transistor is connected with the anode of described illuminating part, the second pole that described illuminating part controls transistor is extremely connected with second of described driving transistors, described illuminating part controls transistor and can close at the reset phase of described image element circuit and compensated stage, and in the glow phase conducting of described image element circuit.
7. image element circuit according to claim 6, it is characterized in that, described image element circuit also comprises illumination scan signal end, the grid that the grid of described power supply conductivity transistor and described illuminating part control transistor is all connected with described illumination scan signal end, and the type of described power supply conductivity transistor is identical with the type that described illuminating part controls transistor.
8. the image element circuit according to Claims 2 or 3, is characterized in that, described power supply conductivity transistor, described driving transistors, described first compensation transistor and described second compensation transistor are P-type crystal pipe.
9. a display panel, described display panel comprises image element circuit, it is characterized in that, described image element circuit is the image element circuit in claim 1 to 8 described in any one.
10. a driving method for image element circuit, is characterized in that, described image element circuit is image element circuit according to claim 1, and described driving method comprises:
Reset step: at the reset phase of described image element circuit, utilize described replacement module to export reset voltage to the grid of described driving transistors;
The compensation process carried out after described replacement step terminates: at compensated stage, data write signal and sweep signal effective, described memory capacitance is charged, to compensate the threshold voltage of described driving transistors by the data write signal of described compensating module by the input of described data write end;
Light emitting step: in glow phase, LED control signal is effective, and described power supply conductivity transistor and described driving transistors are opened thus driven illuminating part luminous.
11. driving methods according to claim 10, it is characterized in that, described compensating module comprises the first compensation transistor, the first sweep signal end that second compensation transistor is connected with the grid of described first compensation transistor and the grid of described second compensation transistor, first pole of described first compensation transistor is connected with the second end of described memory capacitance, second pole of described first compensation transistor is extremely connected with first of described driving transistors, first pole of described second compensation transistor writes to hold with the data of described image element circuit and is connected, second pole of described second compensation transistor is extremely connected with second of described driving transistors,
In described compensation process, input the first sweep signal to described first sweep signal end, to control described first compensation transistor and synchronously conducting or the closedown of described second compensation transistor.
12. driving methods according to claim 10 or 11, it is characterized in that, described replacement module comprises reset transistor and reset voltage end, first pole of described reset transistor is connected with described reset voltage end, second pole of described reset transistor is connected with the grid of described driving transistors, the grid of described reset transistor is connected with the second sweep signal end
In described replacement step, the grid to described reset transistor inputs the second sweep signal, to control the reset phase conducting of reset transistor at described image element circuit.
13. driving methods according to claim 10 or 11, it is characterized in that, described image element circuit also comprises illuminating part and controls transistor, the first pole that described illuminating part controls transistor is connected with the anode of described illuminating part, the second pole that described illuminating part controls transistor is extremely connected with second of described driving transistors, described image element circuit also comprises illumination scan signal end, the grid that the grid of described power supply conductivity transistor and described illuminating part control transistor is all connected with described illumination scan signal end
In described light emitting step, to described illumination scan signal end input illumination scan signal, control transistor close at the reset phase of described image element circuit and compensated stage to control described illuminating part, and in the glow phase conducting of described image element circuit.
14. 1 kinds of display device, described display device comprises display panel, it is characterized in that, described display panel is display panel according to claim 9.
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| CN201410498251.7A CN104282263A (en) | 2014-09-25 | 2014-09-25 | Pixel circuit, drive method thereof, display panel and display device |
| PCT/CN2015/070617 WO2016045261A1 (en) | 2014-09-25 | 2015-01-13 | Pixel circuit, driving method therefor, display panel, and display device |
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|---|---|---|---|
| CN201410498251.7A CN104282263A (en) | 2014-09-25 | 2014-09-25 | Pixel circuit, drive method thereof, display panel and display device |
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