CN105405404A - Pixel circuit, driving method thereof, OLED display panel and display device - Google Patents
Pixel circuit, driving method thereof, OLED display panel and display device Download PDFInfo
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- CN105405404A CN105405404A CN201511029779.0A CN201511029779A CN105405404A CN 105405404 A CN105405404 A CN 105405404A CN 201511029779 A CN201511029779 A CN 201511029779A CN 105405404 A CN105405404 A CN 105405404A
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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
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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
- G09G3/3258—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 voltage across the light-emitting element
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
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- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a pixel circuit, a driving method thereof, an OLED display panel and a display device. The pixel circuit includes transistors from the first transistor to the fourth transistor, a first capacitor, a second capacitor and a light emitting diode; a data current signal is inputted into the first electrode of the third transistor and the first electrode of the fourth transistor; a first voltage signal is inputted into the gates of the third transistor and the fourth transistor as well as one end of the first capacitor; and a second voltage signal is inputted into the gate of the first transistor. By means of the data current signal and the voltage signals provided by the pixel circuit, a voltage driving and current driving hybrid compensation mode is adopted to compensate the threshold voltage and migration rate of the driving transistors, and therefore, the problem of uneven display can be solved, and the display effect of a whole picture can be improved.
Description
Technical field
The present invention relates to flat panel display technology field, be specifically related to a kind of image element circuit and driving method, OLED display panel and display device.
Background technology
Active matrix organic light-emitting diode (ActiveMatrixOrganicLightEmittingDiode, be called for short AMOLED) display be a kind of display technique be applied in TV and mobile device, have broad application prospects in the portable electric appts of sensitive power consumption with its low-power consumption, low cost, large-sized feature.
Organic Light Emitting Diode (OrganicLightEmittingDiode in AMOLED, be called for short OLED) can luminescence be by thin film transistor (TFT) (ThinFilmTransistor, being called for short TFT) drive current that produces drives, but due to the problem of low temperature polycrystalline silicon (LTPS) unevenness in manufacturing process, the characteristic of driving transistors can be caused to there is uneven phenomenon, such as threshold voltage, mobility etc., thus it is uneven to cause whole image to show.
Conventional active matrix organic LED adopts 2T1C pixel driver mode, utilizes a switching thin-film transistor, a driving thin film transistor (TFT) and a memory capacitance to control the luminescence of diode.When sweep signal is effective, switching thin-film transistor is opened, data-signal is stored into memory capacitance, and the voltage signal that memory capacitance stores controls the conducting driving thin film transistor (TFT), the data voltage signal of input is converted to the current signal of OLED luminescence needs to show different GTGs.But 2T1C circuit does not possess the effect of valve value compensation, screen body display effect is relatively poor, is subject to the impact of thin film transistor (TFT) homogeneity difference completely.
In the pixel circuit design of prior art; usually compensating circuit can be adopted compensate the threshold voltage driving thin film transistor (TFT); such as in the 6T1C image element circuit of routine; main employing forms an independent image element circuit with compensation effect by six PMOC thin film transistor (TFT)s and memory capacitance Cs; but the mode that this pixel compensation circuit adopts voltage driven to compensate compensates driving the threshold voltage of thin film transistor (TFT), but can not compensate mobility.
Summary of the invention
The object of the present invention is to provide a kind of image element circuit and driving method, OLED display panel and display device, by providing data current signal and three voltage signals to image element circuit, voltage driven and electric current is adopted to drive the mode of mixed compensation, the threshold voltage of driving transistors and mobility are compensated simultaneously, solve the problem of the display inequality caused thus, improve the display effect of whole picture.
For achieving the above object, the invention provides a kind of image element circuit, be applied to OLED display panel, comprise first to fourth transistor, first and second electric capacity and a light emitting diode, wherein, first electrode of described the first transistor, second electrode of transistor seconds and the second Electrode connection of third transistor are in first node, the grid of described transistor seconds, second electrode of the 4th transistor and one end of the first electric capacity, one end of second electric capacity is connected to Section Point, described third transistor, the grid of the 4th transistor and the other end of the first electric capacity are connected to the 3rd node,
Described 3rd Nodes access one first voltage signal, grid access one second voltage signal of described the first transistor, second Electrode connection of described the first transistor is in the anode of described light emitting diode, and the negative electrode of described light emitting diode is connected to one second reference voltage source; First electrode of described transistor seconds and the other end of described second electric capacity are connected to one first reference voltage source; First electrode of described third transistor and the first electrode of described 4th transistor access a data current signal.
Optionally, also comprise one the 5th transistor, the grid of described 5th transistor accesses the first voltage signal, and the second Electrode connection of described 5th transistor is in the second electrode of described the first transistor, and the first electrode of described 5th transistor accesses a tertiary voltage signal.
Optionally, also comprise one the 6th transistor, the grid of described 6th transistor is connected with the grid of described 4th transistor, and the second electrode of described 4th transistor is connected to described Section Point by described 6th transistor.
Optionally, the first electrode of described 6th transistor is connected with the second electrode of described 4th transistor, and the second Electrode connection of described 6th transistor is in described Section Point.
Optionally, described first electrode, described second electrode drain electrode; Or described first electrode is drain electrode, and described second electrode is source electrode.
Optionally, the driver' s timing of described image element circuit comprises first stage, subordinate phase and phase III, described first voltage signal is low level signal in the first stage, be high level signal in subordinate phase, phase III, described second voltage signal is high level signal in first stage and subordinate phase, described second voltage signal is low level signal in the phase III, and described tertiary voltage signal is low level signal in first stage, subordinate phase and phase III.
Accordingly, the present invention also provides a kind of driving method of image element circuit, is applied to above-mentioned image element circuit, and the driving method of described image element circuit comprises:
First stage: the first voltage signal and tertiary voltage signal are low level signal, the second voltage signal is high level signal, transistor seconds conducting, and its threshold voltage and mobility are compensated, and the gate charges of transistor seconds is to a certain magnitude of voltage Vx;
Subordinate phase: the first voltage signal and the second voltage signal are high level signal, tertiary voltage signal is low level signal, because the grid voltage of the coupling transistor seconds of the first electric capacity increases, becomes Vx+ Δ x;
Phase III: the first voltage signal is high level signal, the second voltage signal and tertiary voltage signal are low level signal, the first transistor conducting, lumination of light emitting diode.
Optionally, in the first stage, described magnitude of voltage Vx is:
Wherein, I
datarepresent the data current that described data current signal provides, C
oxrepresent the unit area gate oxide capacitance of described transistor seconds, μ represents the carrier mobility of described transistor seconds, and W/L represents the channel width-over-length ratio of described transistor seconds, V
ddrepresent that the first reference voltage source provides voltage, V
threpresent the threshold voltage of described transistor seconds.
Accordingly, the present invention also provides a kind of OLED display panel, comprises above-mentioned image element circuit.
Accordingly, the present invention also provides a kind of OLED display, comprises above-mentioned OLED display panel.
Compared with prior art, image element circuit provided by the invention and driving method, OLED display panel and display device have following beneficial effect:
1, by providing data current signal and three voltage signals to image element circuit, voltage driven and electric current is adopted to drive the mode of mixed compensation, the threshold voltage of driving transistors and mobility are compensated simultaneously, solve the problem of the display inequality caused thus, improve the display effect of whole picture;
2, owing to becoming high level signal at subordinate phase first voltage signal from low level signal, the coupling of the first electric capacity makes the grid voltage of transistor seconds get a promotion, the electric current flowing through transistor seconds has a reduction in subordinate phase, phase III brightness is reduced, thus when needs show low grey menu, do not need less data current, thus avoid the long problem of low grey menu lower first stage second capacitor charging time;
3, because tertiary voltage signal can make quick closedown of light-emitting diode (LED) in subordinate phase, therefore can eliminate ghost, extend the life-span of LED device.
Accompanying drawing explanation
The structural representation of the image element circuit that Fig. 1 provides for the embodiment of the present invention one;
Circuit working time diagram in the pixel circuit drive method that Fig. 2 provides for the embodiment of the present invention two;
Embodiment
For making content of the present invention clearly understandable, below in conjunction with Figure of description, content of the present invention is described further.Certain the present invention is not limited to this specific embodiment, and the general replacement known by those skilled in the art is also encompassed in protection scope of the present invention.
Secondly, the present invention's detailed statement that utilized schematic diagram to carry out, when describing example of the present invention in detail, for convenience of explanation, schematic diagram, should to this as restriction of the present invention not according to general ratio partial enlargement.
Core concept of the present invention is, by providing data current signal and three voltage signals to image element circuit, voltage driven and electric current is adopted to drive the mode of mixed compensation, the threshold voltage of driving transistors and mobility are compensated simultaneously, solve the problem of the display inequality caused thus, improve the display effect of whole picture.
[embodiment one]
The structural representation of the image element circuit that Fig. 1 provides for the embodiment of the present invention one, as shown in Figure 1, the present invention proposes an image element circuit, be applied to OLED display panel, comprise first to fourth transistor, first and second electric capacity and a light emitting diode OLED, wherein, first electrode of described the first transistor T1, second electrode of transistor seconds T2 and second Electrode connection of third transistor T3 are in first node N1, the grid of described transistor seconds T2, second electrode of the 4th transistor T4 and one end of the first electric capacity C1, one end of second electric capacity C2 is connected to Section Point N2, described third transistor T3, the grid of the 4th transistor T4 and the other end of the first electric capacity C1 are connected to the 3rd node N3, and
Described 3rd node N3 place's input one first voltage signal S1, the grid input one second voltage signal Emit of described the first transistor T1, second Electrode connection of described the first transistor T1 is in the anode of described light emitting diode OLED, and the negative electrode of described light emitting diode OLED is connected to one second reference voltage source Vss; First electrode of described transistor seconds T2 and the other end of described second electric capacity C2 are connected to one first reference voltage source Vdd; First electrode of described third transistor T3 and first electrode of described 4th transistor T4 input a data current signal Idata.
Described image element circuit also comprises one the 5th transistor T5, the grid of described 5th transistor T5 inputs the first voltage signal S1, second Electrode connection of described 5th transistor T5 is in second electrode of described the first transistor T1, and first electrode of described 5th transistor T5 inputs a tertiary voltage signal Vref.
Described image element circuit also comprises one the 6th transistor T6, and the grid of described 6th transistor T6 is connected with the grid of described 4th transistor T4, and second electrode of described 4th transistor T4 is connected to described Section Point by described 6th transistor T6.Concrete, first electrode of described 6th transistor T6 is connected with second electrode of described 4th transistor T4, and second Electrode connection of described 6th transistor T6 is in described Section Point N2.
The transistor adopted in all embodiments of the present invention can be all thin film transistor (TFT) or field effect transistor or the identical device of other characteristics.In the present embodiment, described first electrode is source electrode, and described second electrode is drain electrode; Or described first electrode is drain electrode, and described second electrode is source electrode.
The driver' s timing of described image element circuit comprises first stage, subordinate phase and phase III, described first voltage signal S1 is low level signal in the first stage, described first voltage signal S1 is high level signal in subordinate phase, subordinate phase, described second voltage signal Emit is high level signal in first stage and subordinate phase, described second voltage signal Emit is low level in the phase III, and described tertiary voltage signal Vref is low level signal in first stage, subordinate phase and phase III; First reference voltage source Vdd is the voltage source with high voltage level comparatively speaking, and the second reference voltage source Vss is the voltage source with low-voltage level comparatively speaking, and the former is greater than the latter, and concrete driver' s timing please refer to embodiment two.
[embodiment two]
The present embodiment provides a kind of driving method of image element circuit, is applied to above-mentioned image element circuit, and the driving method of described image element circuit comprises:
First stage: the first voltage signal and tertiary voltage signal are low level signal, the second voltage signal is high level signal, transistor seconds conducting, and its threshold voltage and mobility are compensated, and the grid voltage of transistor seconds is charged to a certain magnitude of voltage Vx;
Subordinate phase: the first voltage signal and the second voltage signal are high level signal, tertiary voltage signal is low level signal, because the grid voltage of the coupling transistor seconds of the first electric capacity increases, becomes Vx+ Δ x;
Phase III: the first voltage signal is high level signal, the second voltage signal and tertiary voltage signal are low level signal, the first transistor conducting, lumination of light emitting diode.
Concrete, please refer to Fig. 2, first stage t1 is threshold voltage and mobility compensated stage, first voltage signal S1 and tertiary voltage signal Vref is low level signal, second voltage signal Emit is high level signal, transistor seconds T2 conducting, the gate charges of transistor seconds T2 is to a certain magnitude of voltage Vx.
According to formula
and V
gs=Vx-V
ddcan magnitude of voltage be drawn:
Wherein, I
datarepresent the data current that described data current signal provides, C
oxrepresent the unit area gate oxide capacitance of described transistor seconds T2, μ represents the carrier mobility of described transistor seconds T2, and W/L represents the channel width-over-length ratio of described transistor seconds T2, V
ddrepresent the voltage that the first reference voltage source provides, V
threpresent the threshold voltage of described transistor seconds T2.
From above formula, threshold voltage and the mobility of magnitude of voltage Vx now and described transistor seconds T2 are relevant, and the electric current flowing through transistor seconds T2 in this stage is I
data, the data current that Idata provides for data current signal, thus the threshold voltage of described transistor seconds T2 and mobility are compensated.
Subordinate phase t2 is coupling stages, first voltage signal S1 and the second voltage signal Emit is high level signal, tertiary voltage signal Vref is low level signal, the voltage of the 3rd node N3 is raised to high voltage by low-voltage due to the change of the first voltage signal S1, coupling (Coupling) due to the first electric capacity C1 makes the grid voltage of transistor seconds T2 increase, and becomes Vx+ Δ x; When needs show low grey menu, data current signal Idata can be very little, makes the duration of charging of t1 stage second electric capacity C2 long like this, possibly cannot arrive the low GTG effect of expection; Just because of the existence of Coupling, Vx has a rising, the electric current flowing through transistor seconds T2 is made to have a reduction in subordinate phase, phase III brightness is reduced, thus when needs show low grey menu, do not need less Idata, thus the problem that under avoiding low grey menu, the electric capacity C2 duration of charging in t1 stage second is long.
Phase III t3 is light emitting diode OLED working stage, and the first voltage signal S1 is high level signal, and the second voltage signal Emit and tertiary voltage signal Vref is low level signal, the first transistor T1 conducting, and light emitting diode OLED is luminous.Because tertiary voltage signal Vref can make light emitting diode OLED quick closedown in subordinate phase, therefore can eliminate ghost, extend the life-span of LED device.
[embodiment three]
The present embodiment provides a kind of OLED display panel, and described OLED display panel comprises the image element circuit described in embodiment one.
There is in the OLED display panel of the present embodiment the image element circuit in embodiment one, therefore by providing data current signal and three voltage signals to image element circuit, voltage driven and electric current is adopted to drive the mode of mixed compensation, the threshold voltage of driving transistors and mobility are compensated simultaneously, solve the problem of the display inequality caused thus, improve the display effect of whole picture; Owing to becoming high level signal at subordinate phase first voltage signal from low level signal, the coupling of the first electric capacity makes the grid voltage of transistor seconds get a promotion, the electric current flowing through transistor seconds has a reduction in subordinate phase, phase III brightness is reduced, thus when needs show low grey menu, data current need not be very little, avoids the problem that low grey menu lower first stage second capacitor charging time is long; Because tertiary voltage signal can make quick closedown of light-emitting diode (LED) in subordinate phase, therefore can eliminate ghost, extend the life-span of LED device
[embodiment four]
The present embodiment provides a kind of OLED display, and described OLED display comprises the OLED display panel described in embodiment three.
OLED display in the present embodiment has the OLED display panel in embodiment three, therefore by providing data current signal and three voltage signals to image element circuit, voltage driven and electric current is adopted to drive the mode of mixed compensation, the threshold voltage of driving transistors and mobility are compensated simultaneously, solve the problem of the display inequality caused thus, improve the display effect of whole picture; Owing to becoming high level signal at subordinate phase first voltage signal from low level signal, the coupling of the first electric capacity makes the grid voltage of transistor seconds get a promotion, the electric current flowing through transistor seconds has a reduction in subordinate phase, phase III brightness is reduced, thus when needs show low grey menu, data current need not be very little, avoids the problem that low grey menu lower first stage second capacitor charging time is long; Because tertiary voltage signal can make quick closedown of light-emitting diode (LED) in subordinate phase, therefore can eliminate ghost, extend the life-span of LED device.
In sum, touch-control IC provided by the invention, contactor control device and the automatic method detecting touch-screen passage, by providing data current signal and three voltage signals to image element circuit, voltage driven and electric current is adopted to drive the mode of mixed compensation, the threshold voltage of driving transistors and mobility are compensated simultaneously, solve the problem of the display inequality caused thus, improve the display effect of whole picture; Owing to becoming high level signal at subordinate phase first voltage signal from low level signal, the coupling of the first electric capacity makes the grid voltage of transistor seconds get a promotion, the electric current flowing through transistor seconds has a reduction in subordinate phase, phase III brightness is reduced, thus when needs show low grey menu, do not need less data current, thus avoid the long problem of low grey menu lower first stage second capacitor charging time; Because tertiary voltage signal can make quick closedown of light-emitting diode (LED) in subordinate phase, therefore can eliminate ghost, extend the life-span of LED device.
Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention, and any change that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, modification, all belong to the protection domain of claims.
Claims (10)
1. an image element circuit, is applied to OLED display panel, it is characterized in that, comprises first to fourth transistor, first and second electric capacity and a light emitting diode, wherein,
Second Electrode connection of the first electrode of described the first transistor, the second electrode of transistor seconds and third transistor is in first node, the grid of described transistor seconds, the second electrode of the 4th transistor and one end of the first electric capacity, one end of the second electric capacity are connected to Section Point, and described third transistor, the grid of the 4th transistor and the other end of the first electric capacity are connected to the 3rd node;
Described 3rd Nodes access one first voltage signal, grid access one second voltage signal of described the first transistor, second Electrode connection of described the first transistor is in the anode of described light emitting diode, and the negative electrode of described light emitting diode is connected to one second reference voltage source; First electrode of described transistor seconds and the other end of described second electric capacity are connected to one first reference voltage source; First electrode of described third transistor and the first electrode of described 4th transistor access a data current signal.
2. image element circuit as claimed in claim 1, it is characterized in that, also comprise one the 5th transistor, the grid of described 5th transistor accesses the first voltage signal, second Electrode connection of described 5th transistor is in the second electrode of described the first transistor, and the first electrode of described 5th transistor accesses a tertiary voltage signal.
3. image element circuit as claimed in claim 1, it is characterized in that, also comprise one the 6th transistor, the grid of described 6th transistor is connected with the grid of described 4th transistor, and the second electrode of described 4th transistor is connected to described Section Point by described 6th transistor.
4. image element circuit as claimed in claim 3, it is characterized in that, the first electrode of described 6th transistor is connected with the second electrode of described 4th transistor, and the second Electrode connection of described 6th transistor is in described Section Point.
5. the image element circuit according to any one of Claims 1 to 4, is characterized in that, described first electrode is source electrode, and described second electrode is drain electrode; Or described first electrode is drain electrode, and described second electrode is source electrode.
6. the image element circuit according to any one of Claims 1 to 4, it is characterized in that, the driver' s timing of described image element circuit comprises the first stage, subordinate phase and phase III, described first voltage signal is low level signal in the first stage, described first voltage signal is in subordinate phase, phase III is high level signal, described second voltage signal is high level signal in first stage and subordinate phase, described second voltage signal is low level signal in the phase III, described tertiary voltage signal is in the first stage, subordinate phase and phase III are low level signal.
7. a driving method for image element circuit, is characterized in that, is applied to the image element circuit according to any one of claim 1 ~ 6, and the driving method of described image element circuit comprises:
First stage: the first voltage signal and tertiary voltage signal are low level signal, the second voltage signal is high level signal, transistor seconds conducting, and its threshold voltage and mobility are compensated, and the gate charges of transistor seconds is to a certain magnitude of voltage Vx;
Subordinate phase: the first voltage signal and the second voltage signal are high level signal, tertiary voltage signal is low level signal, because the grid voltage of the coupling transistor seconds of the first electric capacity increases, becomes Vx+ Δ x;
Phase III: the first voltage signal is high level signal, the second voltage signal and tertiary voltage signal are low level signal, the first transistor conducting, lumination of light emitting diode.
8. the driving method of image element circuit as claimed in claim 7, it is characterized in that, in the first stage, described magnitude of voltage Vx is:
Wherein, I
datarepresent the data current that described data current signal provides, C
oxrepresent the unit area gate oxide capacitance of described transistor seconds, μ represents the carrier mobility of described transistor seconds, and W/L represents the channel width-over-length ratio of described transistor seconds, V
ddrepresent the voltage that the first reference voltage source provides, V
threpresent the threshold voltage of described transistor seconds.
9. an OLED display panel, is characterized in that, comprises the image element circuit according to any one of claim 1 ~ 6.
10. an OLED display, is characterized in that, comprises OLED display panel according to claim 9.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810151A (en) * | 2016-05-31 | 2016-07-27 | 上海天马微电子有限公司 | Pixel driving circuit, driving method, display panel and display device |
| CN106531076A (en) * | 2017-01-12 | 2017-03-22 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and driving method thereof |
| CN107134261A (en) * | 2017-06-28 | 2017-09-05 | 武汉华星光电半导体显示技术有限公司 | Image element circuit and its control method, display panel |
| CN107424568A (en) * | 2017-09-29 | 2017-12-01 | 成都晶砂科技有限公司 | Display device and compensation device, method comprising light-emitting diode pixel |
| CN108573680A (en) * | 2017-03-09 | 2018-09-25 | 上海和辉光电有限公司 | A kind of array substrate, pixel-driving circuit and image element driving method |
| CN108735161A (en) * | 2018-05-25 | 2018-11-02 | 昆山国显光电有限公司 | Pixel circuit and its driving method, OLED display panel and display device |
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| CN107424568A (en) * | 2017-09-29 | 2017-12-01 | 成都晶砂科技有限公司 | Display device and compensation device, method comprising light-emitting diode pixel |
| CN107424568B (en) * | 2017-09-29 | 2020-04-07 | 成都晶砂科技有限公司 | Display device comprising light emitting diode pixels and compensation device and method |
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| CN108735161B (en) * | 2018-05-25 | 2020-06-16 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof, OLED display panel and display device |
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