CN202976779U - Pixel circuit, display panel and display device - Google Patents
Pixel circuit, display panel and display device Download PDFInfo
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- CN202976779U CN202976779U CN2012206658463U CN201220665846U CN202976779U CN 202976779 U CN202976779 U CN 202976779U CN 2012206658463 U CN2012206658463 U CN 2012206658463U CN 201220665846 U CN201220665846 U CN 201220665846U CN 202976779 U CN202976779 U CN 202976779U
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Abstract
The utility model discloses a pixel circuit, a display panel and a display device which are used for prolonging service life of the display device. The pixel circuit comprises a charging sub-circuit and a driving sub-circuit, and at least two light-emitting control sub-circuits. The driving sub-circuit comprises a driving transistor and a capacitor, wherein a grid electrode of the driving transistor is connected with a first end of the capacitor, a source electrode is connected with a first reference voltage source, and the drain electrode is connected with each light-emitting control sub-circuit, and a second end of the capacitor is connected with the first reference voltage source. The charging sub-circuit is connected with the source electrode of the driving transistor. Each light-emitting control sub-circuit comprises a light-emitting signal source and a first switch transistor, wherein a grid electrode of the first switch transistor is connected with an output end of the light-emitting signal source, and a source electrode of the first switch transistor is connected with the drain electrode of the driving transistor, a drain electrode of the first switch transistor is connected with a first end of a light-emitting device group, and a second end of the light-emitting device group is connected with a second reference voltage source.
Description
Technical field
The utility model relates to organic luminescence technology field, relates in particular to a kind of image element circuit, display panel and display device.
Background technology
Organic light emitting display is low in energy consumption because having, brightness is high, cost is low, the visual angle is wide, and the advantage such as fast response time, receives much concern, and is widely used in the organic light emission technical field.
Organic electroluminescent LED (Organic Light Emitting Diode, OLED) is the more a kind of organic light emitting display of present organic light emission field application.OLED can be divided into passive drive and the large class of active driving two according to type of drive, i.e. directly address and thin film transistor (TFT) (Thin Film Transistor, TFT) matrix addressing two classes at present.Wherein, active driving OLED is also referred to as active matrix OLED(AMOLED), the luminescent device in each pixel region is by image element circuit and load direct supply voltage signal (V
DDOr V
SS) power signal line it is driven luminous.
Referring to Fig. 1, be existing image element circuit structure schematic diagram, comprise drive sub-circuits 81, charging electronic circuit 82, luminescent device D1 is connected with drive sub-circuits 81.Particularly, drive sub-circuits 81 comprises: driving transistors T0 and capacitor C ST, and the end of capacitor C ST is connected with the grid of driving transistors, and the other end is connected with charging electronic circuit 82, the source electrode of driving transistors 81 and voltage signal V
DDBe connected, drain electrode is connected with the end of luminescent device D1, the other end of luminescent device D1 and voltage signal V
SSBe connected.Charging electronic circuit 82 is drive sub-circuits 81 chargings in write phase, loads direct supply voltage signal (V
DDOr V
SS) luminous at glow phase driving luminescent device 9 with luminous drive sub-circuits 81.
At present in the image element circuit of AMOLED display, the only corresponding OLED of each image element circuit, the corresponding light-emitting zone of each OLED, when every two field picture scanning, signal all will write this image element circuit, during every two field picture scanning, the light-emitting zone that OLED is corresponding is all wanted luminescence display, like this, the life-span of OLED can reduce greatly, thereby reduces the serviceable life of display.Life-span is restriction organic light-emitting display device, especially large scale, the key factor of the organic light-emitting display device widespread use of high brightness.
The utility model content
A kind of image element circuit that the utility model embodiment provides and driving method, display panel and display device are in order to improve the life-span of luminescent device in display device.
A kind of image element circuit that the utility model embodiment provides comprises: charging electronic circuit and drive sub-circuits, and at least two light emitting control electronic circuits;
Described drive sub-circuits comprises driving transistors and electric capacity, and the grid of driving transistors is connected with the first end of electric capacity, and source electrode is connected with the first reference voltage source, and drain electrode is connected with each light emitting control electronic circuit, and the second end of electric capacity is connected with the first reference voltage source;
Described charging electronic circuit is connected with the source electrode of described driving transistors;
Described each light emitting control electronic circuit comprises luminous signal source and the first switching transistor, the grid of described the first switching transistor is connected with the output terminal in described luminous signal source, source electrode is connected with the drain electrode of described driving transistors, drain electrode is connected with the first end of luminescent device group, and the second end of luminescent device group is connected with the second reference voltage source.
Preferably, described luminescent device group comprises a luminescent device; The luminescent device that perhaps comprises two or more series connection.
Preferably, described light emitting control electronic circuit also comprises the second switch transistor, the transistorized source electrode of described second switch is connected with the output terminal of described the first reference voltage source, and drain electrode is connected with the source electrode of driving transistors, and grid is connected with the output terminal in described luminous signal source.
Preferably, described charging electronic circuit comprises gate signal source, data signal source and the 3rd switching transistor;
The grid of described the 3rd switching transistor is connected with the output terminal in described gate signal source, and source electrode is connected with the source electrode of described driving transistors, and drain electrode is connected with the output terminal of described data signal source.
Preferably, also comprise the compensation electronic circuit, described compensation electronic circuit comprises the 4th switching transistor, and the source electrode of the 4th switching transistor is connected with the grid of described driving transistors, drain electrode is connected with the drain electrode of described driving transistors, and grid is connected with the output terminal in described gate signal source.
Preferably, also comprise reset subcircuit, this reset subcircuit comprises reset signal source, the 5th switching transistor, with reference to reset voltage source;
The source electrode of described the 5th switching transistor is connected with the first end of described electric capacity, drains and waits that resetting to a certain reference reset voltage source with reference to resetting voltage is connected, and grid is connected with the output terminal in described reset signal source.
Preferably, described driving transistors is the p-type transistor, in described luminescent device group, the positive pole of the luminescent device of close described light emitting control electronic circuit is connected with the light emitting control electronic circuit, and in described luminescent device group, the negative pole of the luminescent device of close described the second reference voltage source is connected with the second reference voltage source; Perhaps described driving transistors is the N-shaped transistor, in described luminescent device group, the negative pole of the luminescent device of close described light emitting control electronic circuit is connected with the light emitting control electronic circuit, positive pole and second reference voltage source of the luminescent device of close described the second reference voltage source in described luminescent device group.
A kind of organic EL display panel that the utility model embodiment provides comprises described image element circuit.
A kind of display device that the utility model embodiment provides comprises described organic EL display panel.
In sum, the utility model embodiment is by the luminescent device at least two non-series connection of pixel region setting, luminous in turn by the luminescent device with at least two light emitting control electronic circuits (the corresponding light emitting control electronic circuit of each luminescent device) described non-series connection of control, improve the serviceable life of each luminescent device, and improve the life-span of display device.When needs improve the brightness that shows image, control a plurality of luminescent devices simultaneously luminous, the light-emitting area of maximum luminescent device, the display brightness of raising display device images.
Description of drawings
Fig. 1 is existing image element circuit structure schematic diagram;
One of image element circuit concrete structure schematic diagram that the p-type transistor that Fig. 2 provides for the utility model embodiment is corresponding;
Two of the image element circuit concrete structure schematic diagram that the p-type transistor that Fig. 3 provides for the utility model embodiment is corresponding;
Three of the image element circuit concrete structure schematic diagram that the p-type transistor that Fig. 4 provides for the utility model embodiment is corresponding;
The p-type transistor correspondence that Fig. 5 provides for the utility model embodiment has the image element circuit structure schematic diagram of the function of compensation T0 threshold voltage;
The image element circuit structure schematic diagram that the p-type transistor correspondence that Fig. 6 provides for the utility model embodiment has reset function;
The sequential chart of the image element circuit work shown in Figure 6 that the p-type transistor that Fig. 7 provides for the utility model embodiment is corresponding;
The organic electroluminescence display panel structural representation with image element circuit structure that Fig. 8 provides for the utility model embodiment.
Embodiment
A kind of image element circuit, display panel and display device that the utility model embodiment provides, in order to improving the life-span of luminescent device in display device, and the luminosity that improves luminescent device.
Due to the image element circuit of active pixel region, the light-emitting area of luminescent device accounts for 30%～40% left and right of pixel region size, and pixel region light-emitting area utilization rate is lower.The utility model is by the luminescent device at least two non-series connection of pixel region setting, luminous in turn by the luminescent device with at least two light emitting control electronic circuits (the corresponding light emitting control electronic circuit of each luminescent device) described non-series connection of control, improve the serviceable life of each luminescent device, and improve the life-span of display device.When needs improve the brightness that shows image, control a plurality of luminescent devices simultaneously luminous, the light-emitting area of maximum luminescent device, the display brightness of raising display device images.
Image element circuit also comprises for the charging electronic circuit and the drive sub-circuits that realize the functions such as charging, driving; In the charging stage, the charging electronic circuit is the capacitor charging in drive sub-circuits; In glow phase, the capacitor discharge in drive sub-circuits drives luminescent device luminous.
Illustrate below by accompanying drawing the technical scheme that the utility model embodiment provides.
Referring to Fig. 2, the image element circuit that the utility model embodiment provides comprises:
Charging electronic circuit 1, drive sub-circuits 2, and at least two light emitting control electronic circuits 3 that are connected in parallel;
The first end C end of each light emitting control electronic circuit 3 is connected with the drain electrode of driving transistors T0, and the second end D end is connected with the luminescent device group 4 that is comprised of at least one luminescent device, and a plurality of luminescent devices are connected in series.In Fig. 2, luminescent device group 4 comprises two luminescent devices, is respectively the first luminescent device D1 and the second luminescent device D2.
Referring to Fig. 2, each light emitting control electronic circuit 3 comprises: luminous signal source 31 and the first switching transistor T1, the grid of the first switching transistor T1 is connected with the output terminal in luminous signal source 31, source electrode is connected with the drain electrode of driving transistors T0, the first end of first luminescent device D1 in drain electrode and luminescent device group 4 is connected, and last luminescent device in luminescent device group 4 such as the second end of the D2 in Fig. 2 are connected with the output terminal of the second reference voltage source 22.Luminous signal source 31 is used for controlling conducting and the cut-off of the first switching transistor T1 under the control of sequential; When the first switching transistor T1 conducting, the luminescent device that is attached thereto and drive sub-circuits 2 place branch road conductings, all luminescent devices that make drive sub-circuits 2 drive in luminescent device group 4 are luminous.
Charging electronic circuit 1 is connected with the source electrode of driving transistors T0, is used for the write phase input data signal at image element circuit.
The output voltage V of the first reference voltage source 21
With reference to 1, the corresponding V of the high level voltage of output
DD, the corresponding V of the low level voltage of output
SSThe corresponding V of the high level voltage of the second reference voltage source 22 outputs
DD, the corresponding V of low level voltage
SS
The first reference voltage source 21 and the second reference voltage source 22 also exportable constant voltage are realized the function of the image element circuit that the utility model embodiment provides, when all crystals pipe is the P transistor npn npn, the first reference voltage source 21 output high level voltage VDD, the second reference voltage source 22 output low level voltage VSS, when all crystals pipe is the N-type transistor, the first reference voltage source 22 output low level voltage VSS, the second reference voltage source output high level voltage VDD.
The transistor that provides in the utility model embodiment is take the p-type transistor as the example explanation.
The first end of described luminescent device is anodal, and the second end is negative pole; Perhaps the first end of described luminescent device is negative pole, and the second end is anodal.When driving transistors T0 was the p-type transistor, the positive pole of the first luminescent device D1 in luminescent device group 4 was connected with light emitting control electronic circuit 3, and the negative pole of the second luminescent device D2 is connected with the second reference voltage source 22.When driving transistors T0 was the N-shaped transistor, the negative pole of the first luminescent device D1 in luminescent device group 4 was connected with light emitting control electronic circuit 3, and the positive pole of the second luminescent device D2 is connected with the second reference voltage source 22.
Usually, the light emitting control electronic circuit in organic light-emitting display device comprises two, and the luminescent device group that is connected with the light emitting control electronic circuit comprises a luminescent device, perhaps at least two luminescent devices that are in series.
The utility model is by arranging at least two light emitting control electronic circuits, and the first switching transistor T1 in light emitting control electronic circuit 3 is used for conducting or cut-off under the control in luminous signal source 31; When the first switching transistor T1 conducting, the luminescent device in the luminescent device group that drive sub-circuits 2 drives with the first switching transistor T1 is connected is luminous; Luminous signal source 31 in different light emitting control electronic circuits 3 is clock signal.When the luminous signal source of all light emitting control electronic circuits 3 31 sequential when identical, simultaneously luminous in glow phase with the luminescent device in luminescent device group that all light emitting control electronic circuits 3 are connected, to improve luminosity.When luminous signal source 31 sequential not simultaneously, part luminescent device group or luminescent device group luminous (that is to say that when luminescent device group is luminous all luminescent devices in this luminescent device group are all luminous), all the other luminescent device groups stop luminous, to improve the life-span of luminescent device.
(reference voltage can be V in order to make image element circuit drive the electric current of luminescent device D1 and reference voltage
DDOr V
SS) irrelevant, avoid V
DDOr V
SSThe curent change that the IR Drop that causes due to load-reason on signal wire causes.Preferably, referring to Fig. 3, the light emitting control electronic circuit 3 that the utility model embodiment provides also comprises second switch transistor T 2; The grid of second switch transistor T 2 is connected with the output terminal in luminous signal source 31, and source electrode is connected with the second end B end of capacitor C ST, and draining is connected with the source electrode of driving transistors T0; Luminous signal source 31 is under the control of sequential, control conducting and the cut-off of second switch transistor T 2, when image element circuit is in write phase, the first switching transistor T1 and 2 cut-offs of second switch transistor T are controlled in luminous signal source 31, luminescent device in the luminescent device group stops luminous, the impact that reduces and avoid luminescent device voltage drop (Voled) that data-signal is write, when image element circuit is in glow phase, the first switching transistor T1 and 2 conductings of second switch transistor T are controlled in luminous signal source 31, drive luminescent device luminous.
Preferably, referring to Fig. 4, the charging electronic circuit comprises: data signal source 11, gate signal source 12, and the 3rd switching transistor T3;
The drain electrode of the 3rd switching transistor T3 is connected with the output terminal of data signal source 11, and source electrode is connected with the output terminal of driving transistors T0, and grid is connected with the output terminal in gate signal source 12; Gate signal source 12 is used for controlling conducting or the cut-off of the 3rd switching transistor T3 under the control of sequential, data signal source 11 is used under the control of sequential to image element circuit data writing signal.
Preferably, the image element circuit that provides of the utility model embodiment also comprises: the threshold voltage V that is used for realizing compensation for drive transistor T0
thThe compensation electronic circuit of function is so that the threshold voltage V of electric current and driving transistors
thIrrelevant.
For achieving the above object, image element circuit also comprises the compensation electronic circuit, referring to Fig. 5, the compensation electronic circuit comprises the 4th switching transistor T4, the source electrode of the 4th switching transistor T4 is connected with the grid of driving transistors T0, drain electrode is connected with the drain electrode of driving transistors T0, and grid is connected with the drive control signal source, and this drive control signal source is used for making the 4th switching transistor T4 conducting or cut-off under the control of sequential.Preferably, the drive control signal source can replace with gate signal source 12, and namely the grid of gate signal source 12, the four switching transistor T4 shown in Fig. 5 is connected with the output terminal in gate signal source 12.
Referring to Fig. 6, described image element circuit also comprises reset subcircuit, and this reset subcircuit comprises:
The first end A end of the source electrode of the 5th switching transistor T5 and capacitor C ST is connected, and drains and waits that resetting to a certain reference reset voltage source 52 with reference to resetting voltage is connected, and grid is connected with the output terminal in reset signal source 51;
The 5th switching transistor T5 conducting is controlled in reset signal source 51, with reference to the voltage V of reset voltage source 52 outputs
refBe loaded into the first end A end of capacitor C ST, the first end A end of capacitor C ST is reset to reference to resetting voltage V
ref, with reference to resetting voltage V
refCan be GND or other a certain magnitude of voltage.
Preferably, describedly be to be similar to the reference voltage source of gate signal source or data signal source or be a constant voltage source with reference to reset voltage source; When described be when being similar to the reference voltage source of gate signal source or data signal source with reference to reset voltage source, the first end A of capacitor C ST end is reset to GND.
Described driving transistors and each switching transistor can also be the N-shaped transistors.The described luminescent device of the utility model embodiment can be Organic Light Emitting Diode OLED or other organic electroluminescent devices etc.
A kind of pixel circuit drive method that the utility model embodiment provides comprises:
Reseting stage, the 5th switching transistor conducting is controlled in described reset signal source, and described voltage-drop loading with reference to reset voltage source output is to the first end of electric capacity, and the first end of electric capacity is reset to reference to resetting voltage;
Write phase, the conducting of the 3rd switching transistor and the 4th switching transistor is controlled in described gate signal source, described data signal source outputting data signals is to described driving transistors source electrode, the 4th switching transistor is connected the grid of described driving transistors with drain electrode, make the connected mode of described driving transistors become the connected mode of diode;
Glow phase, luminous signal source signal according to each light emitting control electronic circuit controlled the first switching transistor and second switch transistor turns, makes described luminescent device group and driving transistors conducting, thus it is luminous to control place electronic circuit luminescent device group.
Below in conjunction with the sequential chart of image element circuit shown in Figure 6 and image element circuit shown in Figure 7, illustrate and drive the pixel circuit drive method that the utility model embodiment provides.
Take driving transistors T0 and each switching transistor as the p-type transistor as the example explanation.V
DDFor higher than GND on the occasion of, V
thIt is negative value.
And the utility model all is reset to GND as the example explanation take the first end A end with capacitor C ST.
Write-in functions and drive sub-circuits that image element circuit shown in Figure 6 has the data-signal of the reset function of reset subcircuit, the valve value compensation function of driving transistors, the electronic circuit that charges drive the luminescent device lighting function.Each electronic circuit is worked under the control of sequential, and correspondingly, image element circuit comprises three working stages, is followed successively by: reseting stage, write phase, and glow phase.
Be the sequential chart of two luminescent device group alternations in each picture frame shown in Fig. 7, when the first two field picture showed, the first luminescent device group of glow phase was luminous, and the second luminescent device group stops luminous; When the second two field picture showed, the first luminescent device group of glow phase stopped luminous, and the second luminescent device group is luminous; When the 3rd two field picture showed, the first luminescent device group of glow phase stopped luminous, and the second luminescent device group is luminous; By that analogy, the first luminescent device group and the first luminescent device group are luminous under the control of the first light emitting control electronic circuit and the second light emitting control electronic circuit at interval of a two field picture.
Reset subcircuit, charging electronic circuit, drive sub-circuits are in each two field picture procedure for displaying, and work schedule is identical.The below is shown as the example explanation with a certain two field picture.
Phase one: reseting stage.
Referring to Fig. 6 and Fig. 7, by sequential chart shown in Figure 7 as can be known:
Two luminous signal source 31 output voltage V shown in Fig. 6
EMISSION-aAnd V
EMISSION-bBe high level.The the first switching transistor T1 and the second switch transistor T 2 that are connected with luminous signal source 31 are in the high level cut-off state, the branch road at the luminescent device D1 in the luminescent device group and D2 place and drive sub-circuits 2 disconnect, luminescent device D1 and luminescent device D2 are in reseting stage at image element circuit and do not work, luminescent device is not subjected to the impact of image element circuit, realizes better display effect.
The first reference voltage source 21 output voltage V
With reference to 1Be low level VSS voltage, the second end B terminal voltage of capacitor C ST is VSS;
The second reference voltage source 22 output voltage V
With reference to 2Be low level VSS voltage;
Subordinate phase: write phase.
Referring to Fig. 6 and Fig. 7, by sequential chart shown in Figure 7 as can be known:
The output voltage V of the first reference voltage source 21
With reference to 1Continue to keep low level;
The second reference voltage source 22 output voltage V
With reference to 2Keep low level VSS voltage;
Data signal source 11 output voltage V
DATABecome high level by low level.V
DATABe carried in the source electrode of driving transistors T0, the 4th switching transistor T4 is connected the grid of driving transistors T0 with drain electrode, make driving transistors T0 become the connected mode of diode, and at this moment, the grid voltage of driving transistors T0 becomes V
DATA+ V
th0
When switching transistor T4 is in conducting state, be used for compensation for drive transistor T0 threshold voltage V
th0The current deviation of the luminescent device D1 that drift causes.The existence of the utility model switching transistor T4 can be so that the electric current of luminescent device D1 and D2 and drive transistor threshold voltage V
th0Irrelevant.
Phase III: glow phase.
Referring to Fig. 6 and Fig. 7, by sequential chart shown in Figure 7 as can be known:
The output voltage V of the first reference voltage source 21
With reference to 1Become high level V by low level
DD
The second reference voltage source 22 output voltage V
With reference to 2Keep low level VSS voltage;
The output voltage in reset signal source 51 still keeps high level.Glow phase, reset subcircuit and charging electronic circuit be input signal not.
One of them luminous signal source 31 output voltage V
EMISSION-aBecome low level by high level, the first switching transistor T1 that is attached thereto and second switch transistor T 2 conducting under low level, the branch road conducting at the first reference voltage source 21 and driving transistors T0 place, the voltage V of the first reference voltage source 21 outputs
DDBe loaded into the grid of driving transistors T0.At this moment, the voltage of driving transistors T0 grid is V
DATA+ V
th0+ V
DD, the source voltage of driving transistors T0 is V
s=V
DDThe branch road conducting at the luminescent device D1 that is connected with the first switching transistor T1 and luminescent device D2 and driving transistors T0 place.Another luminous signal source 31 output voltage V
EMISSION-bStill keep high level, the first switching transistor T1 and the second switch transistor T 2 that are attached thereto end under high level, and the branch road at the luminescent device D1 that is connected with the first switching transistor T1 and luminescent device D2 and driving transistors T0 place disconnects.
At this moment, the source electrode of driving transistors T0 and the voltage difference between grid are V
gs=V
g-V
s=(V
DD+ V
th0+ V
DATA)-V
DD=V
th0+ V
DATA
T0 works in state of saturation due to driving transistors, and according to the state of saturation current characteristics, the leakage current of driving transistors T0 satisfies following formula as can be known:
I wherein
dBe the leakage current of driving transistors T0, V
gsBe the grid of driving transistors T0 and the voltage between source electrode, K is structural parameters, and in same structure, this numerical value is relatively stable, V
th0For the threshold voltage of driving transistors, with V
gs=V
th0+ V
DATABring formula into
Obtain
Hence one can see that, the drain electrode i of the driving transistors T0 that flows through
dThe V that only provides with data signal source 11
DATARelevant, with V
th0And V
DDIrrelevant.This leakage current i
dDrive luminescent device D1 luminous, the threshold voltage V of the driving transistors that the electric current of the OLED that flows through does not cause because of the backboard reasons
th0The inhomogeneous electric current that causes is different, thereby causes that brightness changes.Can be because of V yet
DDThe V that causes due to load-reason on signal wire
DDIR Drop and the curent change that causes.Can also improve due to V simultaneously
th0The curent change of the luminescent device of flowing through that fails and cause, thus cause that brightness changes, and makes the luminescent device bad stability.
When each switching transistor and driving transistors T0 were the N-shaped transistor, electronic circuit structure and Fig. 2 were similar to image element circuit structure shown in Figure 6, and just the voltage that provides of the first reference voltage source is low level voltage V
SS, the negative pole of luminescent device is connected with the light emitting control electronic circuit, and positive pole is connected with the high level voltage of the second reference voltage source 22, for example V
DD
For the image element circuit of N-shaped driving transistors and N-shaped switching transistor, V
thFor on the occasion of.Each switching transistor ends under low level, conducting under high level.The first reference voltage source, reset signal source, data signal source, gate signal source, and sequential chart corresponding to luminous signal source is opposite with sequential chart high-low level shown in Figure 7, the sequential chart of all the other signal sources is identical, repeats no more here.
Need to prove, the image element circuit that the utility model embodiment provides, comprise at least two light emitting control electronic circuits, image element circuit shown in Fig. 2 to Fig. 6 only demonstrates two light emitting control electronic circuits that are connected in parallel, in specific implementation process, a plurality of light emitting control electronic circuits can be set according to demand, and the luminescent device that is connected with each light emitting control electronic circuit.
The drive sub-circuits that the utility model embodiment provides, compensation electronic circuit, charging electronic circuit, and reset subcircuit is not limited to the above-mentioned electronic circuit of mentioning, and can be any electronic circuit structure that can realize corresponding function of other modification.
The utility model embodiment also provides a kind of organic electrode light emitting display panel, comprises above-mentioned image element circuit and luminescent device.As shown in Figure 8, display panel comprises the pixel cell 7 that is the matrix arrangement on substrate 100, substrate 100, and each pixel cell 7 comprises at least two light-emitting zones 71, the corresponding OLED of each light-emitting zone.This is because OLED is that face is luminous, light-emitting area and the shared pixel region of OLED device big or small almost identical.Each light-emitting zone 71 is connected with each light emitting control electronic circuit in image element circuit.
The utility model embodiment also provides a kind of display device, comprises above-mentioned image element circuit.
This display device can be the display device such as ORGANIC ELECTROLUMINESCENCE DISPLAYS oled panel, OLED display, OLED TV or Electronic Paper.
The utility model reference voltage source and be dc signal source with reference to the reset signal source keeps direct current signal always; Reset signal source, gate signal source, data signal source, source driving signal, and the luminous signal source is AC signal, changes according to the variation of sequential.
In addition, the manufacture craft of above-mentioned various transistors (comprising switching transistor and driving transistors) source electrode and drain electrode is identical, can exchange nominally, and it can change nominally according to the direction of voltage.And in same image element circuit, each transistorized type can be identical, also can be different, only need to get final product according to the corresponding sequential high-low level of himself threshold voltage characteristics adjustment.Certainly, preferably mode is, the identical transistor of gate turn-on signal source that needs, and its type is identical.More preferred, in same image element circuit, the type of all crystals pipe identical (comprising switching transistor and driving transistors) is N-shaped transistor or p-type transistor.
In sum, the utility model embodiment is by the luminescent device at least two non-series connection of pixel region setting, luminous in turn by the luminescent device with at least two light emitting control electronic circuits (the corresponding light emitting control electronic circuit of each luminescent device) described non-series connection of control, improve the serviceable life of each luminescent device, and improve the life-span of display device.When needs improve the brightness that shows image, control a plurality of luminescent devices simultaneously luminous, the light-emitting area of maximum luminescent device, the display brightness of raising display device images.
In addition, the utility model embodiment provide a kind of image element circuit not only can guarantee to drive the electric current of luminescent device D1 and reference voltage by image element circuit (reference voltage can be V
DDOr V
SS) irrelevant, with the threshold voltage V of driving transistors
th0Also irrelevant, and also irrelevant with the threshold voltage of each switching transistor.Avoided the driving transistors that causes because of the backboard reasons or/and switching transistor structure difference to some extent, thereby the inhomogeneous electric current of luminescent device that causes of threshold voltage is different.And avoided V
DDOr V
SSThe curent change that the IR Drop that causes due to load-reason on signal wire causes.Curent change and the brightness that can also improve the luminescent device of flowing through that causes due to the threshold voltage decline simultaneously change, and make the problem of luminescent device bad stability.And the light emitting control electronic circuit is controlled image element circuit and luminescent device and is disconnected when the write phase of data-signal, reduces and avoids image element circuit in write phase, the impact that reduces and avoid luminescent device D1 voltage drop (Voled) that data-signal is write.
Obviously, those skilled in the art can carry out various changes and modification and not break away from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model also is intended to comprise these changes and modification interior.
Claims (9)
1. an image element circuit, is characterized in that, comprising: charging electronic circuit, drive sub-circuits, and at least two light emitting control electronic circuits;
Described drive sub-circuits comprises driving transistors and electric capacity, and the grid of driving transistors is connected with the first end of electric capacity, and source electrode is connected with the first reference voltage source, and drain electrode is connected with each light emitting control electronic circuit, and the second end of electric capacity is connected with the first reference voltage source;
Described charging electronic circuit is connected with the source electrode of described driving transistors;
Described each light emitting control electronic circuit comprises luminous signal source and the first switching transistor, the grid of described the first switching transistor is connected with the output terminal in described luminous signal source, source electrode is connected with the drain electrode of described driving transistors, drain electrode is connected with the first end of luminescent device group, and the second end of luminescent device group is connected with the second reference voltage source.
2. image element circuit according to claim 1, is characterized in that, described luminescent device group comprises a luminescent device; The luminescent device that perhaps comprises at least two series connection.
3. image element circuit according to claim 1, it is characterized in that, described light emitting control electronic circuit also comprises the second switch transistor, the transistorized source electrode of described second switch is connected with the output terminal of described the first reference voltage source, drain electrode is connected with the source electrode of described driving transistors, and grid is connected with the output terminal in described luminous signal source.
4. image element circuit according to claim 3, is characterized in that, described charging electronic circuit comprises gate signal source, data signal source and the 3rd switching transistor;
The grid of described the 3rd switching transistor is connected with the output terminal in described gate signal source, and source electrode is connected with the source electrode of described driving transistors, and drain electrode is connected with the output terminal of described data signal source.
5. image element circuit according to claim 4, is characterized in that, also comprises the compensation electronic circuit; Described compensation electronic circuit comprises the 4th switching transistor, and the source electrode of the 4th switching transistor is connected with the grid of described driving transistors, and drain electrode is connected with the drain electrode of described driving transistors, and grid is connected with the output terminal in described gate signal source.
6. image element circuit according to claim 1, is characterized in that, also comprises reset subcircuit, and this reset subcircuit comprises reset signal source, the 5th switching transistor, with reference to reset voltage source;
The source electrode of described the 5th switching transistor is connected with the first end of electric capacity, drains and waits that resetting to a certain reference reset voltage source with reference to resetting voltage is connected, and grid is connected with the output terminal in reset signal source.
7. image element circuit according to claim 2, it is characterized in that, described driving transistors is the p-type transistor, in described luminescent device group, the positive pole of the luminescent device of close described light emitting control electronic circuit is connected with described light emitting control electronic circuit, and in described luminescent device group, the negative pole of the luminescent device of close described the second reference voltage source is connected with described the second reference voltage source; Perhaps described driving transistors is the N-shaped transistor, in described luminescent device group, the negative pole of the luminescent device of close described light emitting control electronic circuit is connected with described light emitting control electronic circuit, and in described luminescent device group, the positive pole of the luminescent device of close described the second reference voltage source is connected with described the second reference voltage source.
8. an organic EL display panel, is characterized in that, comprises the described image element circuit of the arbitrary claim of claim 1-7.
9. a display device, is characterized in that, comprises organic EL display panel claimed in claim 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206658463U CN202976779U (en) | 2012-12-05 | 2012-12-05 | Pixel circuit, display panel and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206658463U CN202976779U (en) | 2012-12-05 | 2012-12-05 | Pixel circuit, display panel and display device |
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| CN202976779U true CN202976779U (en) | 2013-06-05 |
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| CN2012206658463U Expired - Lifetime CN202976779U (en) | 2012-12-05 | 2012-12-05 | Pixel circuit, display panel and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015000245A1 (en) * | 2013-07-02 | 2015-01-08 | 京东方科技集团股份有限公司 | Pixel circuit and driving method therefor, display panel, and display device |
| CN110675805A (en) * | 2019-09-30 | 2020-01-10 | 南京中电熊猫液晶显示科技有限公司 | Pixel circuit, display device and pixel driving method |
-
2012
- 2012-12-05 CN CN2012206658463U patent/CN202976779U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015000245A1 (en) * | 2013-07-02 | 2015-01-08 | 京东方科技集团股份有限公司 | Pixel circuit and driving method therefor, display panel, and display device |
| US9496293B2 (en) | 2013-07-02 | 2016-11-15 | Boe Technology Group Co., Ltd. | Pixel circuit and method for driving the same, display panel and display apparatus |
| CN110675805A (en) * | 2019-09-30 | 2020-01-10 | 南京中电熊猫液晶显示科技有限公司 | Pixel circuit, display device and pixel driving method |
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