CN202855271U - Pixel circuit and display apparatus - Google Patents
Pixel circuit and display apparatus Download PDFInfo
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- CN202855271U CN202855271U CN2012205967012U CN201220596701U CN202855271U CN 202855271 U CN202855271 U CN 202855271U CN 2012205967012 U CN2012205967012 U CN 2012205967012U CN 201220596701 U CN201220596701 U CN 201220596701U CN 202855271 U CN202855271 U CN 202855271U
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- emitting diode
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Abstract
The utility model belongs to the technical field of organic light emitting display, and discloses a pixel circuit being able to compensate transistor threshold voltage drift and controlling display of light-emitting diodes and a display device. According to the utility model, when data is written in the pixel circuit, an isolating transistor is used to disconnect a driving transistor from an organic light-emitting diode, thereby ensuring that light emitting states of the organic light-emitting diode is not influenced when data is written in, and avoiding flickering of display; and a storage capacitor pre-stores a threshold voltage and a data voltage signal of the driving transistor, thereby effectively compensating the threshold voltage drift, maintaining uniformity and stability of driving current, and improving the display quality of the display apparatus.
Description
Technical field
The utility model relates to the organic light emitting display technical field, particularly relates to a kind of image element circuit and display device of the active diode displaying of control that can the compensation transistor threshold voltage shift.
Background technology
One of approach that realizes active light emitting diode (Active Matrix Organic Light-Emitting Diode is called for short " AMOLED ") display is to use active matrix thin film transistor backboard.Be provided with the picture element matrix that the grid line that intersected by transverse and longitudinal and data line limit on this active matrix thin film transistor backboard, each pixel comprises an active device (as: transistor) and luminescent device (as: light emitting diode).Gate driver circuit provides the selection signal successively on selecteed grid line, the transistor in the on-pixel, and then data drive circuit is sent to data-signal by data line the pixel of conducting.
Because the luminosity of AMOLED display and offer Organic Light Emitting Diode (Organic Light-Emitting Diode, abbreviation " OLED ") size of the drive current of device is directly proportional, so in order to realize best display effect, need larger drive current, so low temperature polycrystalline silicon backplane technology, because higher mobility can be provided, it is the optimal selection that AMOLED shows backplane technology, but the threshold voltage shift problem that the low temperature polycrystalline silicon technology is intrinsic, cause the unevenness of the drive current of image element circuit generation, proposed challenge for the homogeneity of display brightness.For the drift of energy effective compensation TFT threshold voltage, in carrying out circuit design, usually introduce compensation technique, thereby obtain preferably display brightness homogeneity.Proposed the design of the simple image element circuit of a kind of circuit structure in this patent, this image element circuit is effectively known clearly to the drift of threshold voltage and is effectively compensated.
The utility model content
The technical matters that (one) will solve
The technical problems to be solved in the utility model provides a kind of image element circuit, in order to compensate the threshold voltage shift of low temperature polycrystalline silicon backboard.
The utility model also provides a kind of organic light-emitting display device, comprises above-mentioned image element circuit, to improve display quality, the flicker problem can not occur showing.
(2) technical scheme
In order to solve the problems of the technologies described above, the utility model provides a kind of image element circuit, includes OLED, the general supply utmost point, earthing pole, switching transistor, partition transistor, driving transistors, compensation transistor and memory capacitance, wherein,
For the described switching transistor that the data voltage of controlling data line writes, its grid is connected with grid line, drain electrode connection data line, and source electrode connects respectively an end of described memory capacitance and the grid of described driving transistors;
The other end of described memory capacitance connects the described general supply utmost point;
Be used for the described compensation transistor to the pre-stored threshold voltage of described memory capacitance, its grid is connected with grid line, source electrode and the grid and the drain electrode that are connected and connect respectively described driving transistors;
Be used to described Organic Light Emitting Diode that the described driving transistors of drive current is provided, its source electrode is connected with the described general supply utmost point, and drain electrode also connects the transistorized source electrode of described partition;
Be used for cutting off the described partition transistor that described driving transistors is connected with described Organic Light Emitting Diode, its grid and enables electrode and is connected, the anodic bonding of drain electrode and described Organic Light Emitting Diode;
The negative electrode of described Organic Light Emitting Diode connects described earthing pole.
Aforesaid image element circuit preferably, also comprises:
Be used for cutting off when described switching transistor turn-offs the blocking capacitor of described switching transistor leakage current;
The source electrode of described switching transistor connects respectively an end of described memory capacitance and the grid of described driving transistors again by described blocking capacitor.
Aforesaid image element circuit preferably, also comprises:
Be used to the grid of described driving transistors to provide the reset transistor of initial voltage, its grid and a control electrode that resets to be connected, drain electrode connects a reset power utmost point, and source electrode connects the grid of described driving transistors.
The utility model also provides a kind of display device, comprises aforesaid image element circuit.
(3) beneficial effect
Image element circuit provided by the utility model is connected connection by cutting off the transistor blocks driving transistors with Organic Light Emitting Diode to the image element circuit data writing time, can the luminance of Organic Light Emitting Diode not exerted an influence when guaranteeing the data writing pixel, avoided the flicker that shows.And by memory capacitance prestore threshold voltage and the data voltage signal of driving transistors, threshold voltage shift has been carried out effective compensation, kept homogeneity and the stability of drive current.Also be provided with blocking capacitor and cut off the leakage current that exists when switching transistor turn-offs, prevent the drive current in the leakage current decay image element circuit.Further be provided with reset transistor, the grid voltage that is used for the initialization driving transistors, because having conductor resistance or dead resistance between the general supply utmost point and the image element circuit, grid voltage after the initialization is used for the compensating resistance pressure drop, guarantee the stability of pixel driving current, improved the display quality of display device.
Description of drawings
Fig. 1 is the structural representation of image element circuit among the utility model embodiment one;
Fig. 2 is the driving sequential synoptic diagram of the driving method of image element circuit among the utility model embodiment two;
Fig. 3 be among the utility model embodiment two image element circuit at reset timing section t
1Working state schematic representation;
Fig. 4 is that image element circuit is compensating sequential section t among the utility model embodiment two
2Working state schematic representation;
Fig. 5 is that image element circuit is driving display timing generator section t among the utility model embodiment two
3Working state schematic representation.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for explanation the utility model, but are not used for limiting scope of the present utility model.
Embodiment one
Figure 1 shows that the structural representation of image element circuit among the utility model embodiment.Specify circuit structure and the principle of work that voltage drives image element circuit as an example of the image element circuit structure of the organic light emitting diode display of common cathode example in the present embodiment.As shown in Figure 1, image element circuit among the utility model embodiment comprises 4 thin film transistor (TFT)s, be respectively switching transistor 101, cut off transistor 102, driving transistors 103 and compensation transistor 104, also comprise memory capacitance 106, the general supply utmost point 110, earthing pole 120 and Organic Light Emitting Diode 130, grid line 140 provides selects signal to come opening switch transistor 101, and data line 150 is by switching transistor 101 data writing voltage signal in the pixel.Wherein, the grid of switching transistor 101 is connected with grid line 140, drain electrode connection data line 150, source electrode connects respectively an end of memory capacitance 105 and the grid of driving transistors 103, select under the control of signal at grid line 140, switching transistor 101 provides the data voltage signal V of data line 150 to memory capacitance 106 and driving transistors 103
Data, the other end of memory capacitance 106 connects the general supply utmost point 110, under the control of the general supply utmost point 110, charges to data voltage signal V by switching transistor 101 to the A point
Data, and by memory capacitance 106 these voltages of maintenance.The grid of compensation transistor 104 is connected with grid line 140, source electrode and the grid and the drain electrode that are connected and connect respectively driving transistors 103, select under the control of signal at grid line 140, compensation transistor 104 conductings, the source electrode of driving transistors 103 links to each other with drain electrode, forming a diode connects, guarantee that driving transistors 103 is in region of saturation current, provide stable charging current, under the control of the general supply utmost point 110, by giving the method for memory capacitance 106 chargings, with the threshold voltage V of driving transistors 103
Th Store 106 li of memory capacitance into, reach compensating threshold voltage V
Th Purpose.Driving transistors 103 is subjected to the control of memory capacitance 106 storage voltages and conducting or block, its source electrode is connected with the general supply utmost point 110, drain electrode also connects the source electrode that cuts off transistor 102, be used for providing even, stable drive current to Organic Light Emitting Diode 130, wherein, the electric current that flows through driving transistors 103 is subject to the Control of Voltage of storage on the memory capacitance 106.The grid and one that cuts off transistor 102 enables electrode 160 and is connected, and partition transistor 102 is opened or turn-offed to the anodic bonding of drain electrode and Organic Light Emitting Diode 130 under the control that enables electrode 160.At the data voltage signal V to this image element circuit data writing line 150
DataThe time, turn-off and cut off transistor 102, after preventing cutting off transistor 102 conductings, charge to Organic Light Emitting Diode 130, cause memory capacitance 106 pre-stored driving transistors 103 threshold voltages to be offset, Organic Light Emitting Diode 130 shows flicker.The negative electrode of Organic Light Emitting Diode 130 connects earthing pole 120.
Because transistor is at off state, generally also can there be leakage current, preferred switching transistor 101 source electrodes connect respectively an end of memory capacitance 106 and the grid of driving transistors 103 again by a blocking capacitor 107 in the present embodiment, and blocking capacitor 107 is used for cutting off the leakage current that exists when switching transistor 101 turn-offs.Prevent when data writing voltage in image element circuit, because the existence of leakage current is so that the drive current of driving transistors 103 produces decay, thereby cause Organic Light Emitting Diode 120 luminous unstable, show flicker.
Image element circuit in the present embodiment can also comprise reset transistor 105, its grid and one control electrode 170 that resets is connected, drain electrode connects a reset power utmost point 180, source electrode connects the grid of driving transistors 103, by applying voltage turn-on for the control electrode 170 that resets or turn-offing reset transistor 105.Can with the reset power utmost point 180 ground connection, play the reset response to A point current potential.If have conductor resistance or dead resistance between the general supply utmost point 110 and the image element circuit, can adjust the voltage swing of the reset power utmost point 180, before writing pixel, open reset transistor 105, under the control of the general supply utmost point 110, give memory capacitance 106 chargings, the voltage signal of the reset power utmost point 180 is offered memory capacitance 106 and driving transistors 103, pressure drop so that the conductor resistance between the compensation general supply utmost point 110 and the image element circuit or dead resistance produce has overcome the pixel current fluctuation problem that this pressure drop causes.
Image element circuit in the present embodiment can be compatible with the data driving chip of voltage amplitude modulation, also can be compatible with the data driving chip of pulse-length modulation, be used for to grid line 140, data line 150, enable electrode 160, the control electrode 170 that resets etc. provides required voltage signal.
Those skilled in the art are easy to draw the organic light emitting diode display that image element circuit provided by the utility model also is applicable to the common anode utmost point, are not limited to the organic light emitting diode display of the common cathode in the present embodiment, do not repeat them here.
Embodiment two
On the image element circuit basis of embodiment one, the utility model embodiment provides a kind of method of utilizing this image element circuit to carry out pixel driver.
Figure 2 shows that the driving sequential synoptic diagram of the driving method of image element circuit shown in Figure 1.As shown in Figure 2, in this sequential chart, the selection signal voltage GATE of the grid line 140 in a frame work schedule, the data voltage V of data line 150 have been illustrated
DataAnd control cuts off the level EM that enables electrode 140 of transistor 102 break-makes.Wherein, need memory capacitance 106 is discharged before the writing pixel circuit, to eliminate the impact of previous frame data.This driving method mainly comprises compensation for drive transistor 103 threshold voltage V
ThShow two sequential sections with driving, and data writing is to finish in compensation sequential section.Compensation transistor 104 and driving transistors 103 are under the control of multi-level voltage signal, at the threshold voltage V of 106 li pre-stored driving transistorss 103 of memory capacitance
ThAnd the data voltage V of data line 150
Data, driving display timing generator section memory capacitance 106 this threshold voltage of maintenance V
ThWith data voltage V
DataConstant.Divide above-mentioned compensation and drive two sequential section t of demonstration below in conjunction with Fig. 4 and Fig. 5
2And t
3Be specifically described as follows to this driving method:
Need to prove, among Fig. 3-Fig. 5, the transistor or the signal wire (signal wire in the present embodiment comprises grid line 140, data line 150, enables electrode 160 and the control electrode 170 that resets) that connect by a dotted line represent that this transistor is in closed condition, and the signal of signal wire then is invalid signals.
Compensation sequential section t
2:
In this sequential section, Organic Light Emitting Diode 130 is in closed condition, and pre-stored one is approximately equal to the initial voltage of driving transistors 103 threshold voltages and the data voltage V of data line 150 in the memory capacitance 106
DataBe specially, as shown in Figure 2, at t
2The sequential section is as data writing voltage V in pixel
DataThe time, the selection signal voltage GATE of the grid line 140 of this pixel becomes low level, so that switching transistor 101 and compensation transistor 103 are in conducting state, data voltage V
Data Offer memory capacitance 106 and driving transistors 103, in conjunction with shown in Figure 4.The operating voltage of the general supply utmost point 110 is V
DDApply a high level signal to the source electrode of driving transistors 103, this moment, the grid of driving transistors 103 linked to each other with drain electrode, forming a diode connects, guarantee that driving transistors 103 is operated in the current saturation district, provide stable drive current to charge to the B point, then the threshold voltage between grid and the drain electrode is V
Th, it is V that memory capacitance 106 up times charge to the A point voltage
Data-V
ThThe level EM that enables electrode 160 is in high level state, and the low level signal synchronization with grid line 140, cut off transistor 102 maintenance off states so that compensation is blocked, thereby Organic Light Emitting Diode 130 is in closed condition, prevents drive current I in memory capacitance 106 charging processes
dThe unstable flicker that causes Organic Light Emitting Diode 130 to show.
If have conductor resistance or dead resistance between the general supply utmost point 110 and the image element circuit, the pressure drop meeting that it causes causes pixel driving current I
dFluctuation, so also need to compensate this pressure drop.Be specifically as follows, as shown in Figure 2, at t
2Also comprise reset timing section t before the sequential section
1:
In conjunction with shown in Figure 3, t
1The sequential section, the operating voltage of control electrode 170 of resetting is RESET, apply a low level signal to the grid of reset transistor 105, so that reset transistor 105 is in open mode, adjust the drain voltage of reset transistor 105, namely adjust the voltage of the reset power utmost point 180, so that the source voltage V of reset transistor 105
d(being the A point voltage) is approximately equal to the pressure drop that above-mentioned conductor resistance or dead resistance cause.Then pass through t
2Behind the threshold voltage compensation of sequential section, the voltage that A is ordered is V
Data+ V
Ref-V
Th
Drive display timing generator section t
3:
In this sequential section, Organic Light Emitting Diode 130 is in open mode, and the storage voltage of memory capacitance 106 drives Organic Light Emitting Diode 130 and shows, in conjunction with shown in Figure 5.Be specially, the selection signal of grid line 140 becomes voltage GATE and becomes high level, and switching transistor 101 and compensation transistor 104 are in the state of blocking, and applies a high level signal for the control electrode 170 that resets, turn-off reset transistor 105, prevent that memory capacitance 106 pre-stored voltages are offset.By applying a low level signal for the grid (namely enabling electrode 160) that cuts off transistor 102, open and cut off transistor 102, so that Organic Light Emitting Diode 130 is in open mode.Pre-stored voltage V in memory capacitance 106
Data+ V
d-V
DDGuarantee that driving transistors 103 is operated in the saturation region, for Organic Light Emitting Diode 130 provides stable drive current, because this drive current I
dWith (V
Gs-V
Th)
2Be directly proportional, and (V
Gs-V
Th)
2=[V
DD-(V
Data+ V
Ref-V
Th)-V
Th)]
2=(V
DD-V
Data-V
Ref)
2, as seen, drive current I
dThreshold voltage V with driving transistors 102
ThHave nothing to do, then driving transistors 102 threshold voltage V
ThDrift, can be to drain current, i.e. the drive current I of image element circuit
d, exert an influence, so that showing, stablizes Organic Light Emitting Diode 130, can not glimmer.
Embodiment three
A kind of display device is provided among the utility model embodiment, comprises that the voltage among the embodiment one drives image element circuit.Particularly, described display device comprises a plurality of pixel unit array, the arbitrary image element circuit in the corresponding above-described embodiment of each pixel cell.Because this image element circuit has compensated the threshold voltage shift of driving transistors, so that the demonstration of Organic Light Emitting Diode is stable, can not glimmer, thereby guarantee the display quality of organic light-emitting display device.
As can be seen from the above embodiments, image element circuit provided by the utility model is connected connection by cutting off the transistor blocks driving transistors with Organic Light Emitting Diode to the image element circuit data writing time, can the luminance of Organic Light Emitting Diode not exerted an influence when guaranteeing the data writing pixel, avoided the flicker that shows.And by memory capacitance prestore threshold voltage and the data voltage signal of driving transistors, threshold voltage shift has been carried out effective compensation, kept homogeneity and the stability of drive current.Also be provided with blocking capacitor and cut off the leakage current that exists when switching transistor turn-offs, prevent the drive current in the leakage current decay image element circuit.Further be provided with reset transistor, the grid voltage that is used for the initialization driving transistors, because having conductor resistance or dead resistance between the general supply utmost point and the image element circuit, grid voltage after the initialization is used for the compensating resistance pressure drop, guarantee the stability of pixel driving current, improved the display quality of display device.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and replacement, these improvement and replacement also should be considered as protection domain of the present utility model.
Claims (4)
1. an image element circuit includes OLED, the general supply utmost point, earthing pole, switching transistor, partition transistor, driving transistors, compensation transistor and memory capacitance, it is characterized in that,
For the described switching transistor that the data voltage of controlling data line writes, its grid is connected with grid line, drain electrode connection data line, and source electrode connects respectively an end of described memory capacitance and the grid of described driving transistors;
The other end of described memory capacitance connects the described general supply utmost point;
Be used for the described compensation transistor to the pre-stored threshold voltage of described memory capacitance, its grid is connected with grid line, source electrode and the grid and the drain electrode that are connected and connect respectively described driving transistors;
Be used to described Organic Light Emitting Diode that the described driving transistors of drive current is provided, its source electrode is connected with the described general supply utmost point, and drain electrode also connects the transistorized source electrode of described partition;
Be used for cutting off the described partition transistor that described driving transistors is connected with described Organic Light Emitting Diode, its grid and enables electrode and is connected, the anodic bonding of drain electrode and described Organic Light Emitting Diode;
The negative electrode of described Organic Light Emitting Diode connects described earthing pole.
2. image element circuit according to claim 1 is characterized in that, also comprises:
Be used for cutting off when described switching transistor turn-offs the blocking capacitor of described switching transistor leakage current;
The source electrode of described switching transistor connects respectively an end of described memory capacitance and the grid of described driving transistors again by described blocking capacitor.
3. image element circuit according to claim 1 is characterized in that, also comprises:
Be used to the grid of described driving transistors to provide the reset transistor of initial voltage, its grid and a control electrode that resets to be connected, drain electrode connects a reset power utmost point, and source electrode connects the grid of described driving transistors.
4. a display device is characterized in that, comprises the arbitrary described image element circuit of claim 1-3.
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| CN2012205967012U CN202855271U (en) | 2012-11-13 | 2012-11-13 | Pixel circuit and display apparatus |
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| CN103440841A (en) * | 2013-07-23 | 2013-12-11 | 深圳典邦科技有限公司 | Pixel circuit of organic light-emitting display and control method thereof |
| CN103702105A (en) * | 2013-12-30 | 2014-04-02 | 京东方科技集团股份有限公司 | OLED (Organic Light Emitting Diode) display, stereoscopic display system and display method of stereoscopic display system |
| CN103985351A (en) * | 2014-05-09 | 2014-08-13 | 深圳市华星光电技术有限公司 | Pixel driving circuit, driving method of pixel driving circuit and display panel |
| CN104167170A (en) * | 2014-07-10 | 2014-11-26 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, and display device |
| CN106128366A (en) * | 2016-09-19 | 2016-11-16 | 成都京东方光电科技有限公司 | Pixel-driving circuit and driving method thereof and display device |
| CN103985351B (en) * | 2014-05-09 | 2016-11-30 | 深圳市华星光电技术有限公司 | A kind of pixel-driving circuit and driving method, display floater |
| WO2017054406A1 (en) * | 2015-09-28 | 2017-04-06 | 京东方科技集团股份有限公司 | Pixel drive circuit, pixel circuit, display panel and display device |
| US9805656B2 (en) | 2014-04-23 | 2017-10-31 | Shanghai Tianma AM-OLED Co., Ltd. | Organic light emitting display device, pixel circuit of the same and driving method thereof |
| CN108510945A (en) * | 2018-03-06 | 2018-09-07 | 福建华佳彩有限公司 | Oled pixel compensation circuit |
| CN108847186A (en) * | 2018-06-29 | 2018-11-20 | 昆山国显光电有限公司 | Pixel circuit and its driving method, display panel and display device |
| CN109427290A (en) * | 2017-08-23 | 2019-03-05 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display device |
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| CN103440841A (en) * | 2013-07-23 | 2013-12-11 | 深圳典邦科技有限公司 | Pixel circuit of organic light-emitting display and control method thereof |
| CN103440841B (en) * | 2013-07-23 | 2015-11-18 | 深圳典邦科技有限公司 | A kind of image element circuit of organic light emitting display and control method thereof |
| CN103702105B (en) * | 2013-12-30 | 2015-07-22 | 京东方科技集团股份有限公司 | OLED (Organic Light Emitting Diode) display, stereoscopic display system and display method of stereoscopic display system |
| CN103702105A (en) * | 2013-12-30 | 2014-04-02 | 京东方科技集团股份有限公司 | OLED (Organic Light Emitting Diode) display, stereoscopic display system and display method of stereoscopic display system |
| US9805656B2 (en) | 2014-04-23 | 2017-10-31 | Shanghai Tianma AM-OLED Co., Ltd. | Organic light emitting display device, pixel circuit of the same and driving method thereof |
| CN103985351B (en) * | 2014-05-09 | 2016-11-30 | 深圳市华星光电技术有限公司 | A kind of pixel-driving circuit and driving method, display floater |
| CN103985351A (en) * | 2014-05-09 | 2014-08-13 | 深圳市华星光电技术有限公司 | Pixel driving circuit, driving method of pixel driving circuit and display panel |
| CN104167170B (en) * | 2014-07-10 | 2016-08-31 | 京东方科技集团股份有限公司 | Image element circuit and driving method thereof and display device |
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| WO2017054406A1 (en) * | 2015-09-28 | 2017-04-06 | 京东方科技集团股份有限公司 | Pixel drive circuit, pixel circuit, display panel and display device |
| US10515591B2 (en) | 2016-09-19 | 2019-12-24 | Boe Technology Group Co., Ltd. | Pixel driving circuit, driving method thereof, display substrate and display apparatus |
| CN106128366A (en) * | 2016-09-19 | 2016-11-16 | 成都京东方光电科技有限公司 | Pixel-driving circuit and driving method thereof and display device |
| US10789891B2 (en) | 2016-09-19 | 2020-09-29 | Boe Technology Group Co., Ltd. | Pixel circuit, driving method thereof, display substrate and display apparatus |
| CN109427290A (en) * | 2017-08-23 | 2019-03-05 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display device |
| US10885839B2 (en) | 2017-08-23 | 2021-01-05 | Boe Technology Group Co., Ltd. | Pixel circuit and driving method thereof, and display device |
| CN108510945A (en) * | 2018-03-06 | 2018-09-07 | 福建华佳彩有限公司 | Oled pixel compensation circuit |
| CN108847186A (en) * | 2018-06-29 | 2018-11-20 | 昆山国显光电有限公司 | Pixel circuit and its driving method, display panel and display device |
| CN108847186B (en) * | 2018-06-29 | 2021-05-25 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof, display panel and display device |
| CN109872682A (en) * | 2019-03-28 | 2019-06-11 | 武汉华星光电半导体显示技术有限公司 | Pixel compensation circuit and display device |
| CN110277049A (en) * | 2019-07-09 | 2019-09-24 | 武汉华星光电半导体显示技术有限公司 | Pixel-driving circuit and display panel |
| CN111312170A (en) * | 2019-11-13 | 2020-06-19 | 武汉华星光电半导体显示技术有限公司 | Pixel driving circuit and display device |
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