CN108877668A - A kind of pixel circuit, its driving method and display panel - Google Patents
A kind of pixel circuit, its driving method and display panel Download PDFInfo
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- CN108877668A CN108877668A CN201810842614.2A CN201810842614A CN108877668A CN 108877668 A CN108877668 A CN 108877668A CN 201810842614 A CN201810842614 A CN 201810842614A CN 108877668 A CN108877668 A CN 108877668A
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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
Abstract
The invention discloses a kind of pixel circuit, its driving method and display panel, which includes reseting module, Data write. module, compensating module, drive module, light emitting control module, luminance adjustment module and single color light emitting devices.Since drive module passes through the light emitting control module of luminance adjustment module and conducting, driving single color light emitting devices issue the light that brightness is increased with temperature and increased or reduced, it may make under hot conditions, the brightness ratio of three kinds of single color light emitting devices of RGB varies less even unchanged, thus it is guaranteed that under hot conditions the mixed white light white balance of three kinds of single color light emitting devices of RGB stability.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of pixel circuits, its driving method and display panel.
Background technique
With the popularity of the internet and the continuous development of display technology, the display panel of high-quality have become numerous electricity
The important feature of sub- consumer products.Compared with liquid crystal display panel, organic electroluminescent display panel has self-luminous, energy consumption
It is low, production cost is low, visual angle is wide, contrast is high, fast response time, color show it is more true to nature, be more easily implemented it is lightening and
The advantages that flexibility.Currently, organic electroluminescent is aobvious in display fields such as mobile phone, digital camera, computer, personal digital assistants
Show that panel has begun and replace traditional liquid crystal display panel, is expected to become the mainstream selection of next-generation display panel.
As the temperature rises, the monochromatic brightness that RGB sub-pixel issues in organic electroluminescent display panel increases
By force, so that the brightness of the mixed white light of RGB sub-pixel enhances with the raising of temperature.However, the monochrome that blue sub-pixel issues
The brightness of light increases at least, and the mixed white light of RGB sub-pixel is caused to turn to be yellow.For example, after temperature becomes 70 DEG C from room temperature,
The brightness of mixed white light increases, and chromaticity coordinates is deviated to yellow direction.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of pixel circuit, its driving method and display panel, to realize height
The white balance of the mixed white light of RGB sub-pixel under the conditions of temperature.
Therefore, a kind of pixel circuit provided in an embodiment of the present invention, including：Reseting module, Data write. module, compensation mould
Block, drive module, light emitting control module, luminance adjustment module and single color light emitting devices；
Wherein, the reseting module and reset signal end, reference signal end, initializing signal end, first node, the second section
Point is respectively connected with, under the control at the reset signal end, the first segment to be written in the signal at the reference signal end
Point, and the second node is written into the signal at the initializing signal end；
The Data write. module is respectively connected with scanning signal end, data signal end, the first node, in institute
It states and the first node is written into the signal of the data signal end under the control at scanning signal end；
The compensating module is respectively connected with the second node, the scanning signal end, third node, for described
Under the control at scanning signal end, the second node is written into the threshold voltage of the drive module；
The drive module is respectively connected with the first power end, the second node, the third node, the luminous control
Molding block and LED control signal end, the reference signal end, the first node, the second node, the brightness regulation
One end of module, the single color light emitting devices the first pole be respectively connected with, the second pole of the single color light emitting devices with second electricity
Source is connected, and the luminance adjustment module other end is connected with the third node；The drive module is used for described second
Under the control of node, by the light emitting control module of the luminance adjustment module and conducting, the monochromatic light emitters are driven
Part issues the light that brightness is increased with temperature and increased or reduced.
In one possible implementation, in above-mentioned pixel circuit provided in an embodiment of the present invention, the reset mould
Block includes first switch transistor and second switch transistor；
The grid of the first switch transistor is connected with the reset signal end, the first pole and reference signal end phase
Even, the second pole is connected with the first node；
The grid of the second switch transistor is connected with the reset signal end, the first pole and the initializing signal end
It is connected, the second pole is connected with the second node.
In one possible implementation, in above-mentioned pixel circuit provided in an embodiment of the present invention, the data are write
Entering module includes third switching transistor；
The grid of the third switching transistor is connected with the scanning signal end, the first pole and the data signal end phase
Even, the second pole is connected with the first node.
In one possible implementation, in above-mentioned pixel circuit provided in an embodiment of the present invention, the compensation mould
Block includes the 4th switching transistor；
The grid of 4th switching transistor is connected with the scanning signal end, the first pole and the third node phase
Even, the second pole is connected with the second node.
In one possible implementation, in above-mentioned pixel circuit provided in an embodiment of the present invention, the driving mould
Block includes driving transistor；
The grid of the driving transistor is connected with the second node, and the first pole is connected with first power end, the
Two poles are connected with the third node.
In one possible implementation, in above-mentioned pixel circuit provided in an embodiment of the present invention, the luminous control
Molding block includes the 5th switching transistor, the 6th switching transistor and capacitor；
The grid of 5th switching transistor is connected with the LED control signal end, the first pole and the reference signal
End is connected, and the second pole is connected with the first node；
The grid of 6th switching transistor is connected with the LED control signal end, the first pole and fourth node phase
Even, the second pole is extremely connected with the first of the single color light emitting devices；
The capacitance connection is between the first node and the second node.
In one possible implementation, in above-mentioned pixel circuit provided in an embodiment of the present invention, the brightness tune
Saving module includes thermistor；
Described thermistor one end is connected with fourth node, and the other end is connected with the third node.
In one possible implementation, in above-mentioned pixel circuit provided in an embodiment of the present invention, the temperature-sensitive electricity
Resistance is negative tempperature coefficient thermistor, and the single color light emitting devices are blue light emitting device；The temperature alternatively, thermistor is positive
Coefficient resistance is spent, the single color light emitting devices are green luminescence device or red light emitting device.
Based on the same inventive concept, the embodiment of the invention also provides a kind of display panels, including above-mentioned pixel circuit；
And the pixel circuit is for when driving blue light emitting device, drive module to be specifically used for the control in second node
Under, by the light emitting control module of luminance adjustment module and conducting, the blue light emitting device is driven to issue brightness with temperature liter
High and increase light；
Alternatively, the pixel circuit is for when driving red light emitting device or green luminescence device, drive module specifically to be used
In under the control of second node, by the light emitting control module of luminance adjustment module and conducting, the red illuminator is driven
Part or the green luminescence device issue brightness and increase and reduced light with temperature.
Based on the same inventive concept, the embodiment of the invention also provides a kind of driving methods of above-mentioned pixel circuit, including：
First node is written under the control at reset signal end, by the signal at reference signal end in first stage, reseting module,
And second node is written into the signal at initializing signal end；
Second stage, Data write. module is under the control at scanning signal end by the signal of data signal end write-in described the
One node；The second node is written under the control at the scanning signal end, by the threshold voltage of drive module in compensating module；
Phase III, the drive module pass through luminance adjustment module and conducting under the control of the second node
Light emitting control module, driving single color light emitting devices issue the light that brightness is increased with temperature and increased or reduced.
The present invention has the beneficial effect that：
Pixel circuit, its driving method and display panel provided in an embodiment of the present invention, including：Reseting module, data are write
Enter module, compensating module, drive module, light emitting control module, luminance adjustment module and single color light emitting devices；Wherein, mould is resetted
Block is respectively connected with reset signal end, reference signal end, initializing signal end, first node, second node, for resetting letter
Under the control at number end, first node is written into the signal at reference signal end, and the second section is written into the signal at initializing signal end
Point；Data write. module is respectively connected with scanning signal end, data signal end, first node, for the control at scanning signal end
First node is written into the signal of data signal end under system；Compensating module and second node, scanning signal end, third node are distinguished
It is connected, under the control at scanning signal end, second node to be written in the threshold voltage of drive module；Drive module and first
Power end, second node, third node are respectively connected with, light emitting control module and LED control signal end, reference signal end, first
Node, second node, one end of luminance adjustment module, single color light emitting devices the first pole be respectively connected with, single color light emitting devices
Second pole is connected with second source end, and the luminance adjustment module other end is connected with third node；Drive module is used in the second section
Under the control of point, by the light emitting control module of luminance adjustment module and conducting, single color light emitting devices is driven to issue brightness with temperature
Spend the light for increasing and increasing or reducing.Since drive module passes through the light emitting control module of luminance adjustment module and conducting, driving
Single color light emitting devices issue the light that brightness is increased with temperature and increased or reduced, and may make three kinds of monochromes of RGB under hot conditions
The brightness ratio of luminescent device vary less even it is unchanged, thus it is guaranteed that under hot conditions three kinds of monochromes of RGB shine
The stability of the mixed white light white balance of device.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of concrete structure schematic diagram of pixel circuit shown in FIG. 1；
Fig. 3 is the flow chart of the driving method of pixel circuit provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of pixel circuit in the prior art；
Fig. 5 is the saturation current curve graph for driving transistor；
Fig. 6 is the working timing figure of pixel circuit shown in Fig. 2；
Fig. 7 and Fig. 8 is respectively each section resistance schematic diagram in pixel circuit shown in Fig. 2.
Specific embodiment
With reference to the accompanying drawing, to the specific of pixel circuit provided in an embodiment of the present invention, its driving method and display panel
Embodiment is described in detail.It should be noted that this specification described embodiment is only that present invention a part is real
Example is applied, instead of all the embodiments；And in the absence of conflict, the features in the embodiments and the embodiments of the present application
It can be combined with each other；In addition, based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work
Under the premise of all other embodiment obtained, shall fall within the protection scope of the present invention.
A kind of pixel circuit provided in an embodiment of the present invention, as shown in Figure 1, including：Mould is written in reseting module 101, data
Block 102, compensating module 103, drive module 104, light emitting control module 105, luminance adjustment module 106 and single color light emitting devices
OLED；
Wherein, reseting module 101 and reset signal end Reset, reference signal end Ref, initializing signal end Vinit, the
One node A, second node B are respectively connected with, under the control of reset signal end Reset, by the signal of reference signal end Ref
First node A is written, and second node B is written into the signal of initializing signal end Vinit；
Data write. module 102 is respectively connected with scanning signal end Gate, data signal end Data, first node A, is used for
First node A is written into the signal of data signal end Data under the control of scanning signal end Gate；
Compensating module 103 and second node B, scanning signal end Gate, third node C are respectively connected with, for believing in scanning
Number end Gate control under, by the threshold voltage V of drive module 104thSecond node B is written；
Drive module 104 and the first power end VDD, second node B, third node C are respectively connected with, light emitting control module
105 with LED control signal end EM, reference signal end Ref, first node A, second node B, luminance adjustment module 106 one
It holds, the first pole of single color light emitting devices OLED is respectively connected with, the second pole and the second source end VSS phase of single color light emitting devices OLED
Even, 106 other end of luminance adjustment module is connected with third node C；Drive module 104 is used under the control of second node B, is led to
The light emitting control module 105 of luminance adjustment module 106 and conducting is crossed, driving single color light emitting devices OLED issues brightness with temperature liter
The high and light that increases or reduces.
In above-mentioned pixel circuit provided in an embodiment of the present invention, since drive module 104 passes through luminance adjustment module 106
With the light emitting control module 105 of conducting, drives single color light emitting devices OLED to issue brightness and increase and increase or reduce with temperature
Light may make the brightness ratio of three kinds of single color light emitting devices OLED of RGB under hot conditions to remain unchanged or vary less, because
This, ensure that the stability of the mixed white light white balance of three kinds of single color light emitting devices OLED of RGB under hot conditions.
It should be noted that in above-mentioned pixel circuit provided in an embodiment of the present invention, the signal electricity of the first power end VDD
Pressure is generally high voltage, and the signal voltage of second source end VSS is generally low-voltage or ground connection.In practical applications, the first electricity
The voltage needs of the signal of source VDD and second source end VSS design determination according to actual application environment, do not limit herein
It is fixed.
Combined with specific embodiments below, the present invention is described in detail.It should be noted that this specific embodiment be for
The better explanation present invention, but do not limit the present invention.
Specifically, in above-mentioned pixel circuit provided in an embodiment of the present invention, as shown in Fig. 2, reseting module 101 includes the
One switching transistor T1 and second switch transistor T2；Wherein, the grid of first switch transistor T1 and reset signal end Reset
It is connected, the first pole is connected with reference signal end Ref, and the second pole is connected with first node A；The grid of second switch transistor T2 with
Reset signal end Reset is connected, and the first pole is connected with initializing signal end Vinit, and the second pole is connected with second node B.
Data write. module 102 includes third switching transistor T3, and the grid of third switching transistor T3 and scanning are believed
Number end Gate be connected, the first pole is connected with data signal end Data, and the second pole is connected with first node A.
Compensating module 103 includes the 4th switching transistor T4, and the grid of the 4th switching transistor T4 and scanning signal end
Gate is connected, and the first pole is connected with third node C, and the second pole is connected with second node B.
Drive module 104 includes driving transistor Td, and the grid of transistor Td is driven to be connected with second node B, and first
Pole is connected with the first power end VDD, and the second pole is connected with third node C.
Light emitting control module 105 includes the 5th switching transistor T5, the 6th switching transistor T6 and capacitor Cst；Wherein,
The grid of five switching transistor T5 is connected with LED control signal end EM, and the first pole is connected with reference signal end Ref, the second pole with
First node A is connected；The grid of 6th switching transistor T6 is connected with LED control signal end EM, the first pole and fourth node D
It is connected, the second pole is extremely connected with the first of single color light emitting devices OLED；Capacitor Cst be connected to first node A and second node B it
Between.
Luminance adjustment module 106 includes thermistor TC, and the one end thermistor TC is connected with fourth node D, the other end
It is connected with third node C.
Further, thermistor TC is negative tempperature coefficient thermistor NTC, and single color light emitting devices OLED is blue light hair
Optical device Blue OLED；Alternatively, thermistor TC is posive temperature coefficient thermistor PTC, and single color light emitting devices OLED is green
Light luminescent device Green OLED or red light emitting device Red OLED.
It is understood that the above is only the specific structures for illustrating each module in pixel circuit, in the specific implementation,
The specific structure of each module is not limited to above structure provided in an embodiment of the present invention, can also be skilled person will appreciate that
Other structures, it is not limited here.
In addition, each transistor mentioned in the above embodiment of the present invention can be thin film transistor (TFT) (TFT, Thin Film
Transistor), it is also possible to metal oxide semiconductor field effect tube (MOS, Metal Oxide Semiconductor),
It is not limited here；Also, these transistors are P-type transistor or N-type transistor.First pole of these transistors and second
Pole is respectively source electrode and drain electrode, in practical applications, according to transistor types and the difference of input signal, the first pole and second
The function of pole can be interchanged, and not do specific differentiation.
Correspondingly, for above-mentioned pixel circuit provided in an embodiment of the present invention, the embodiment of the invention also provides driving sides
Method, as shown in figure 3, can specifically include following steps：
S301, first stage, reseting module are written first under the control at reset signal end, by the signal at reference signal end
Node, and second node is written into the signal at initializing signal end；
The signal of data signal end is written under the control at scanning signal end for S302, second stage, Data write. module
First node；Second node is written under the control at scanning signal end, by the threshold voltage of drive module in compensating module；
S303, phase III, drive module by luminance adjustment module and are connected luminous under the control of second node
Control module, driving single color light emitting devices issue the light that brightness is varied with temperature and increased or reduced.
As shown in figure 4, for a kind of pixel circuit in the prior art, using red green in this kind of pixel circuit driving display panel
When blue three kinds of single color light emitting devices, the saturation current curve of three kinds of single color light emitting devices of RGB is flowed through as shown in figure 5, can see
Out, the electric current of saturation region is with the pressure difference V between the drain electrode and source electrode of driving transistor TdDSIncrease and increase.Also, actually
It measures under hot conditions, as the temperature rises, the brightness of three kinds of single color light emitting devices of RGB increases, however three kinds of RGB
The raised ratio of single color light emitting devices brightness is different, wherein increasing at least with the brightness of blue light emitting device, causes mixing for three
Close white light jaundice.
It then, is the white balance for realizing mixed white light under high temperature, the embodiment of the invention also provides a kind of display panel, packets
Include pixel circuit shown in Fig. 2 provided in an embodiment of the present invention；And blue illuminator is driven using pixel circuit shown in Fig. 2
Part passes through the light emitting control mould of luminance adjustment module and conducting so that drive module is specifically used under the control of second node
Block, driving blue light emitting device issue the light that brightness increases with temperature and increased；It is driven simultaneously using pixel circuit shown in Fig. 4
Red light emitting device and green luminescence device, in this way, to increase with temperature, the brightness increase of blue light emitting device is unlikely to phase
It is very few for red light emitting device and green luminescence device, so that the brightness ratio of three is remained unchanged or is varied less,
Realize the white balance of mixed white light under high temperature.Alternatively, driving red light emitting device and green light to send out using pixel circuit shown in Fig. 2
Optical device, drive module are specifically used under the control of second node, pass through the light emitting control mould of luminance adjustment module and conducting
Block drives red light emitting device and green luminescence device to issue brightness and increases and reduced light with temperature；Simultaneously using shown in Fig. 4
Pixel circuit drive blue light emitting device, in this way, to increase with temperature, red light emitting device and green luminescence device it is bright
Degree increases and is unlikely to excessive relative to blue light emitting device, so that the brightness ratio of three is remained unchanged or is varied less,
Realize the white balance of mixed white light under high temperature.
It is understood that the display panel can be：Mobile phone, Vehicular display device, tablet computer, television set, notebook
Computer, digital camera, navigator, smartwatch, body building wrist strap, personal digital assistant, self-service deposit/withdrawal machine etc. are any with aobvious
Show the products or components of function.Other essential component parts for display panel are the ordinary skill people of this field
For member it should be understood that having, this will not be repeated here, also should not be taken as limiting the invention.
Technical solution for a better understanding of the present invention, below with two specifically embodiment be described in detail.
Embodiment one
In example 1, using pixel circuit shown in Fig. 2 driving blue light emitting device carry out it is luminous, while using figure
The driving red light emitting device of pixel circuit shown in 4 and green luminescence device carry out luminous.
It should be noted that pixel circuit shown in Fig. 2 is similar to the course of work of pixel circuit shown in Fig. 4, it is different
Be to increase a thermistor TC compared to pixel circuit shown in Fig. 4 because of pixel circuit shown in Fig. 2 so that shown in Fig. 2
Pixel circuit can be adjusted according to temperature change and flow through the electric currents of single color light emitting devices, to adjust the bright of single color light emitting devices
Degree, therefore only the course of work of pixel circuit shown in Fig. 2 is done to be described in detail below.The course of work of pixel circuit shown in Fig. 4
It can refer to the course of work of pixel circuit shown in Fig. 2, overlaps will not be repeated.
Each transistor is P-type transistor in pixel circuit shown in Fig. 2, is connected under low level effect, in high level
The lower cut-off of effect；Thermistor TC is negative tempperature coefficient thermistor NTC, and single color light emitting devices OLED is blue light emitting device
Blue OLED.Corresponding working timing figure is as shown in fig. 6, specifically, select the first rank in working timing figure shown in fig. 6
It is described in detail for section t1, second stage t2 and phase III t3.
First stage t1：LED control signal end EM exports high level, and reset signal end Reset exports low level, scanning
Signal end Gate exports high level.
First switch transistor T1 and second switch transistor T2 is under the low level effect of reset signal end Reset
On state, the signal V of reference signal end RefrefFirst node A, initialization letter is written in first switch transistor T1 through being connected
Second node B is written in second switch transistor T2 of the signal through being connected of number end Vinit, and drives transistor Td in second node B
Control under it is in the conductive state.Height electricity of the third switching transistor T3 and the 4th switching transistor T4 in scanning signal end Gate
Flat effect is lower to be in off state.Height of the 5th switching transistor T5 and the 6th switching transistor T6 in LED control signal end EM
Level effect is lower to be in off state.
Second stage t2：LED control signal end EM exports high level, and reset signal end Reset exports high level, scanning
Signal end Gate exports low level.
Third switching transistor T3 in the conductive state, data signal end under the low level effect of scanning signal end Gate
The signal V of DatadataFirst node A is written in third switching transistor T3 through being connected.4th switching transistor T4 believes in scanning
On state is also under the low level effect of number end Gate, and driving transistor Td maintains on state, so that driving transistor
Td is equivalent to a diode, and the current potential of third node C becomes Vdd+Vth, the current potential of second node B becomes V at this timedd+Vth,
Middle VddFor the high level signal of the first power end VDD output, VthFor the threshold voltage for driving transistor Td.First switch crystal
Pipe T1 and second switch transistor T2 is in off state under the high level effect of reset signal end Reset.5th switch is brilliant
Body pipe T5 and the 6th switching transistor T6 is in off state under the high level effect of LED control signal end EM.
Phase III t3：LED control signal end EM exports low level, and reset signal end Reset exports high level, scanning
Signal end Gate exports high level.
5th switching transistor T5 and the 6th switching transistor T6 is under the low level effect of LED control signal end EM
In on state, the signal V of reference signal end RefrefFirst node A is written in the 5th switching transistor T5 through being connected, causes the
The potential change amount of one node A is Vref-Vdata.Since the quantity of electric charge of capacitor Cst storage is constant, the electricity of second node B
Position is by Vdd+VthVariation is Vdd+Vth+Vref-Vdata, at this time drive transistor Td saturation current be：
Wherein, μ is the mobility for driving the semiconductor layer carrier of transistor Td, CoxFor the dielectric layer for driving transistor Td
Capacitor, W/L be drive transistor Td channel width-over-length ratio, VGSThe pressure difference between grid and source electrode to drive transistor Td.
Drive the saturation current curve of transistor Td as shown in Figure 5, it can be seen that the electric current of saturation region is with driving transistor
Pressure difference V between the drain electrode and source electrode of TdDSIncrease and increase.Also, under hot conditions, as the temperature rises, driving is brilliant
The mobility [mu] of body pipe Td semiconductor layer carrier can also increase, if as shown in figure 4, in pixel circuit do not include thermistor TC,
Then drive the saturation current I of transistor TddAs driving single color light emitting devices OLED carries out luminous electric current, and then driving is monochromatic
The electric current of luminescent device OLED must be increased because the mobility [mu] of carrier is increased with temperature, cause single color light emitting devices OLED
Brightness increase.But since the raised ratio of three kinds of single color light emitting devices OLED brightness of RGB is different, wherein with blue light emitting
The brightness of device Blue OLED increases at least, and the mixed white light of three is caused to turn to be yellow.
Based on this, the embodiment of the present invention is driven using the pixel circuit shown in Fig. 2 comprising negative tempperature coefficient thermistor NTC
Blue light emitting device Blue OLED carries out luminous, while additionally using pixel circuit shown in Fig. 4 driving red light emitting device
Red OLED and green luminescence device Green OLED carry out it is luminous so that under hot conditions, red light emitting device Red OLED,
The brightness ratio of green luminescence device Green OLED and blue light emitting device Blue OLED three remain unchanged or change very
It is small, realize the white balance of mixed white light.
Specifically, Fig. 7 is pixel circuit each section resistance schematic diagram shown in Fig. 2.Specifically, in Fig. 7, negative temperature system
Number thermistor NTC is the thermistor TC in Fig. 2, and blue light emitting device Blue OLED is the single color light emitting devices in Fig. 2
OLED.And as shown in fig. 7, the difference between the first power end VDD and second source end VSS is definite value, R1 represents driving crystal
The resistance of pipe Td, the resistance of R2 representation switch transistor T6, R3 represent the resistance of blue light emitting device Blue OLED, and R4 is represented
The resistance of negative tempperature coefficient thermistor NTC.Since negative tempperature coefficient thermistor NTC has negative temperature coefficient, and its resistance
R4 reduces with the raising of temperature, and correspondingly, the resistance R1 of driving transistor Td becomes larger, then drives drain electrode and the source of transistor Td
Pressure difference V between poleDSBecome larger.Saturation current curve is it is found that flow through blue light emitting device Blue OLED's according to figure 5
Saturation current increases, so that increasing with temperature, the brightness increase of blue light emitting device Blue OLED is unlikely to relative to red
Light luminescent device Red OLED and green luminescence device Green OLED are very few, so that the brightness ratio of three remains unchanged
Or vary less, realize the white balance of mixed white light under high temperature.
Seen from the above description, although the resistance value of negative tempperature coefficient thermistor NTC and temperature coefficient are indefinite, according to drive
After the saturation current curve of dynamic transistor Td, the pressure difference of the first power end VDD and second source end VSS are adjusted, it can obtain
Suitable resistance value and temperature coefficient are obtained, so that blue light emitting device Blue OLED, red light emitting device Red OLED and green light hair
The brightness ratio of optical device Green OLED three remain unchanged or change it is smaller, to realize mixed white light under hot conditions
White balance.
In subsequent period of time, pixel circuit will repeat the course of work of above-mentioned t1-t3.
Embodiment two
In example 2, red light emitting device Red OLED and green luminescence are driven using pixel circuit shown in Fig. 2
Device Green OLED carries out luminous, and posive temperature coefficient thermistor is arranged in pixel circuit shown in Fig. 2, while also using figure
The driving of pixel circuit shown in 4 blue light emitting device Blue OLED carries out luminous.
It should be noted that since pixel circuit shown in Fig. 2 drives red light emitting device Red OLED and green luminescence
Device Green OLED carries out luminous process, and to drive blue light emitting device Blue OLED to carry out luminous process with it similar,
Therefore only difference is described below, overlaps will not be repeated.
It specifically, is posive temperature coefficient thermistor PTC in thermistor TC, single color light emitting devices OLED is red light-emitting
Under conditions of device R ed OLED or green luminescence device Green OLED, pixel circuit each section resistance signal shown in Fig. 2
Figure is as shown in Figure 8.Specifically, posive temperature coefficient thermistor PTC is the thermistor TC in Fig. 2, red light-emitting in Fig. 8
Device R ed OLED or green luminescence device Green OLED is the single color light emitting devices OLED in Fig. 2.And as shown in figure 8,
Difference between one power end VDD and second source end VSS is definite value, and R1 represents the resistance of driving transistor Td, and R2 representative is opened
The resistance of transistor T6 is closed, R3 ' represents the resistance of red light emitting device Red OLED or green luminescence device Green OLED,
R4 ' represents the resistance of posive temperature coefficient thermistor PTC.
Since posive temperature coefficient thermistor PTC has positive temperature coefficient, and its resistance R4 increases with the raising of temperature,
Correspondingly, it drives the resistance R1 of transistor Td to become smaller, then drives the pressure difference V between the drain electrode and source electrode of transistor TdDSBecome smaller.Root
According to saturation current curve shown in fig. 5 it is found that flowing through red light emitting device Red OLED or green luminescence device Green OLED
Saturation current reduce so that being increased with temperature, red light emitting device Red OLED and green luminescence device Green
The brightness increase of OLED is unlikely to excessive relative to blue light emitting device Blue OLED, so that the brightness ratio of three is tieed up
It holds constant or varies less, realize the white balance of mixed white light under high temperature.
Seen from the above description, although the resistance value of posive temperature coefficient thermistor PTC and temperature coefficient are indefinite, according to drive
After the saturation current curve of dynamic transistor Td, the pressure difference of the first power end VDD and second source end VSS are adjusted, it can obtain
Suitable resistance value and temperature coefficient are obtained, so that blue light emitting device Blue OLED, red light emitting device Red OLED and green light hair
The brightness ratio of optical device Green OLED three remain unchanged or change it is smaller, to realize mixed white light under hot conditions
White balance.
It should be noted that, in this document, such as first and second etc relational terms are used merely to an entity
Or operation is distinguished with another entity or operation, is appointed without necessarily requiring or implying existing between these entities or operation
What this actual relationship or sequence.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of pixel circuit, which is characterized in that including：Reseting module, Data write. module, compensating module, drive module, hair
Photocontrol module, luminance adjustment module and single color light emitting devices；
Wherein, the reseting module and reset signal end, reference signal end, initializing signal end, first node, second node point
Not Xiang Lian, under the control at the reset signal end, the first node is written into the signal at the reference signal end, and
The second node is written into the signal at the initializing signal end；
The Data write. module is respectively connected with scanning signal end, data signal end, the first node, for sweeping described
It retouches and the first node is written into the signal of the data signal end under the control of signal end；
The compensating module is respectively connected with the second node, the scanning signal end, third node, in the scanning
Under the control of signal end, the second node is written into the threshold voltage of the drive module；
The drive module is respectively connected with the first power end, the second node, the third node, the light emitting control mould
Block and LED control signal end, the reference signal end, the first node, the second node, the luminance adjustment module
One end, the single color light emitting devices the first pole be respectively connected with, the second pole of the single color light emitting devices and second source end
It is connected, the other end of the luminance adjustment module is connected with the third node；The drive module is used in second section
Under the control of point, by the light emitting control module of the luminance adjustment module and conducting, the single color light emitting devices are driven
Issue the light that brightness is increased with temperature and increased or reduced.
2. pixel circuit as described in claim 1, which is characterized in that the reseting module includes first switch transistor and
Two switching transistors；
The grid of the first switch transistor is connected with the reset signal end, and the first pole is connected with the reference signal end,
Second pole is connected with the first node；
The grid of the second switch transistor is connected with the reset signal end, the first pole and initializing signal end phase
Even, the second pole is connected with the second node.
3. pixel circuit as described in claim 1, which is characterized in that the Data write. module includes third switch crystal
Pipe；
The grid of the third switching transistor is connected with the scanning signal end, and the first pole is connected with the data signal end,
Second pole is connected with the first node.
4. pixel circuit as described in claim 1, which is characterized in that the compensating module includes the 4th switching transistor；
The grid of 4th switching transistor is connected with the scanning signal end, and the first pole is connected with the third node, the
Two poles are connected with the second node.
5. pixel circuit as described in claim 1, which is characterized in that the drive module includes driving transistor；
The grid of the driving transistor is connected with the second node, and the first pole is connected with first power end, the second pole
It is connected with the third node.
6. pixel circuit as described in claim 1, which is characterized in that the light emitting control module includes the 5th switch crystal
Pipe, the 6th switching transistor and capacitor；
The grid of 5th switching transistor is connected with the LED control signal end, the first pole and reference signal end phase
Even, the second pole is connected with the first node；
The grid of 6th switching transistor is connected with the LED control signal end, and the first pole is connected with fourth node, the
Two poles are extremely connected with the first of the single color light emitting devices；
The capacitance connection is between the first node and the second node.
7. pixel circuit as described in claim 1, which is characterized in that the luminance adjustment module includes thermistor；
Described thermistor one end is connected with fourth node, and the other end is connected with the third node.
8. pixel circuit as claimed in claim 7, which is characterized in that the thermistor is negative tempperature coefficient thermistor,
The single color light emitting devices are blue light emitting device；Alternatively, the thermistor is posive temperature coefficient thermistor, the monochrome
Luminescent device is green luminescence device or red light emitting device.
9. a kind of display panel, which is characterized in that including such as described in any item pixel circuits of claim 1-8；
And the pixel circuit for drive blue light emitting device when, drive module be specifically used under the control of second node,
By the light emitting control module of luminance adjustment module and conducting, drive the blue light emitting device issue brightness increase with temperature and
The light of increase；
Alternatively, the pixel circuit is for when driving red light emitting device or green luminescence device, drive module to be specifically used for
Under the control of second node, by the light emitting control module of luminance adjustment module and conducting, drive the red light emitting device or
The green luminescence device issues brightness and increases and reduced light with temperature.
10. a kind of driving method of such as described in any item pixel circuits of claim 1-8, which is characterized in that including：
First node is written under the control at reset signal end, by the signal at reference signal end in first stage, reseting module, and will
Second node is written in the signal at initializing signal end；
Under the control at scanning signal end the first segment is written in the signal of data signal end by second stage, Data write. module
Point；The second node is written under the control at the scanning signal end, by the threshold voltage of drive module in compensating module；
Phase III, the drive module by luminance adjustment module and are connected luminous under the control of the second node
Control module, driving single color light emitting devices issue the light that brightness is increased with temperature and increased or reduced.
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