CN101826301A - Light emitting diode drive circuit as well as driving method and display device thereof - Google Patents
Light emitting diode drive circuit as well as driving method and display device thereof Download PDFInfo
- Publication number
- CN101826301A CN101826301A CN201010171184A CN201010171184A CN101826301A CN 101826301 A CN101826301 A CN 101826301A CN 201010171184 A CN201010171184 A CN 201010171184A CN 201010171184 A CN201010171184 A CN 201010171184A CN 101826301 A CN101826301 A CN 101826301A
- Authority
- CN
- China
- Prior art keywords
- transistor
- transistorized
- light emitting
- led driving
- electrically coupled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Control Of El Displays (AREA)
- Led Devices (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention relates to a light emitting diode drive circuit as well as a driving method and a display device thereof. The light emitting diode drive circuit comprises a first transistor, a second transistor, a third transistor, a one-way conducting element and a capacitor. The control end of the first transistor is controlled by a first signal so as to decide whether the first transistor is conducted or not; the second transistor is coupled between a power source electric potential and a light emitting diode, and the control end of the second transistor receives data signals transmitted by the first transistor when the first transistor is conducted; the control end of the third transistor is controlled by a second signal so as to decide whether the power source electric potential is transferred to the first end of the capacitor or not, and the second end of the capacitor is coupled with the control end of the second transistor; and the one-way conducting element is coupled between the first end of the capacitor and a reference signal. In addition, the reference signal makes the one-way conducting element not conducted within a certain duration due to reverse bias.
Description
Technical field
The invention relates to the display technique field, and particularly relevant for LED driving circuit and its driving method and display device.
Background technology
Light emitting diode (Light Emitting Diode, LED) pixel of display device is generally come store charge with transistor collocation storage capacitors, with the brightness performance of control light emitting diode; Wherein light emitting diode is a kind of current driving element, and it is according to the different lights that produce in various degree of the size of current of flowing through.See also Fig. 1, it illustrates the synoptic diagram into the single image element circuit of traditional light emitting display device.Image element circuit 10 is as single light emitting module, and it comprises LED driving circuit 12 and Organic Light Emitting Diode 16; LED driving circuit 12 shows in order to the brightness of control Organic Light Emitting Diode 16, and is two-transistor one electric capacity (2T1C) framework.Particularly, LED driving circuit 12 comprises transistor M1, transistor M2 and capacitor C 1; The drain electrode of transistor M1 receives data-signal Vdata because of the electric property coupling relation, and whether the control that the grid of transistor M1 is accepted control signal SCAN makes data-signal Vdata be passed to the source electrode of transistor M1 with decision; The grid of transistor M2 is electrically coupled to the source electrode of transistor M1, the source electrode of transistor M2 is electrically coupled to power supply potential OVDD, the drain electrode of transistor M2 is electrically coupled to the positive pole of Organic Light Emitting Diode 16, and the negative pole of Organic Light Emitting Diode 16 is electrically coupled to another power supply potential OVSS; The two ends cross-over connection of capacitor C 1 is between the grid and source electrode of transistor M2.
Yet because the OVDD power lead of each image element circuit of light emitting display device all links together, when Organic Light Emitting Diode 16 was luminous, the OVDD power lead had electric current and flows through.Yet have the metal impedance owing to the OVDD power supply is online, therefore can produce supply voltage falls (that is IR Drop), makes the power supply potential OVDD meeting of each image element circuit variant.Because the luminosity of Organic Light Emitting Diode 16 is proportional to the size of current of flowing through, and because of the power supply potential OVDD of each image element circuit difference to some extent, can cause the difference of electric current between image element circuit and the image element circuit, the brightness that it produced will be different, therefore cause panel to show uneven phenomenon.In addition, because the influence of manufacturing process, its critical voltage of the transistor of each image element circuit is not identical, even make and give identical data-signal, the electric current that the different pixels circuit is produced is still variant, also can cause panel to show uneven phenomenon.
Summary of the invention
The purpose of this invention is to provide a kind of LED driving circuit, panel shows uneven problem in the prior art to improve.
A further object of the present invention provides a kind of LED driving method, and panel shows uneven problem in the prior art to improve.
Another purpose of the present invention provides a kind of display device, and panel shows uneven problem in the prior art to improve.
A kind of LED driving circuit that the embodiment of the invention proposes is suitable for the driven for emitting lights diode.Wherein, a plurality of transistors are arranged in the LED driving circuit, and each transistor comprises control end, first path terminal and alternate path end.Particularly, LED driving circuit comprises the first transistor, transistor seconds, the 3rd transistor, unidirectional breakover element and electric capacity.Wherein, the control end of the first transistor is subjected to the control of first signal with first path terminal of decision the first transistor and the state that electrically conducts between the alternate path end, and first path terminal of the first transistor receives data-signal because of the electric property coupling relation; The control end of transistor seconds is electrically coupled to the alternate path end of the first transistor, and first path terminal of transistor seconds is electrically coupled to preset potential, and the alternate path end of transistor seconds is electrically coupled to light emitting diode; The 3rd transistorized control end is subjected to the control of secondary signal to determine the state that electrically conducts between the 3rd transistorized first path terminal and the alternate path end, and the 3rd transistorized first path terminal is electrically coupled to above-mentioned preset potential; One end of unidirectional breakover element is electrically coupled to the 3rd transistorized alternate path end, and the other end receives reference signal because of the electric property coupling relation; Electric capacity is electrically coupled between the control end of the 3rd transistorized alternate path end and transistor seconds.Moreover reference signal can make the not conducting because of reverse biased of unidirectional breakover element in a certain period.
In one embodiment of this invention, above-mentioned unidirectional breakover element is a diode.
In one embodiment of this invention, above-mentioned unidirectional breakover element is the 4th transistor, and the 4th transistorized control end and first path terminal receive reference signal because of the electric property coupling relation simultaneously, and the 4th transistorized alternate path end is electrically coupled to the 3rd transistorized alternate path end.
A kind of LED driving method that the embodiment of the invention proposes is applicable in the above-mentioned LED driving circuit.Particularly, LED driving method comprises step: (1) adjusts first signal, secondary signal and reference signal with conducting the first transistor and unidirectional breakover element in first period, and makes the 3rd transistor can't conducting; And in (2) second period after first period, adjust first signal, secondary signal and reference signal, and make the first transistor and the unidirectional breakover element can't conducting with conducting the 3rd transistor.Wherein, in second period, unidirectional breakover element is because reverse biased and can't conducting.
In one embodiment of this invention, above-mentioned first signal and secondary signal are anti-phase, and reference signal and secondary signal homophase.
A kind of display device that the embodiment of the invention proposes comprises power supply device and light emitting source.Wherein, power supply device is in order to provide electric power; Light emitting source is electrically coupled to power supply device to accept electric power.Particularly, light emitting source comprises at least one light emitting module, and light emitting module comprises light emitting diode and LED driving circuit.Wherein, a plurality of transistors are arranged in the LED driving circuit, each transistor comprises control end, first path terminal and alternate path end.More specifically, LED driving circuit comprises the first transistor, transistor seconds, the 3rd transistor, unidirectional breakover element and electric capacity; The control end of the first transistor is subjected to the control of first signal with first path terminal of decision the first transistor and the state that electrically conducts between the alternate path end, and first path terminal of the first transistor receives data-signal because of the electric property coupling relation; The control end of transistor seconds is electrically coupled to the alternate path end of the first transistor, and the preset potential that is provided by power supply device is provided first path terminal of transistor seconds, and the alternate path end of transistor seconds is electrically coupled to light emitting diode; The 3rd transistorized control end is subjected to the control of secondary signal to determine the state that electrically conducts between the 3rd transistorized first path terminal and the alternate path end, and the 3rd transistorized first path terminal is electrically coupled to above-mentioned preset potential; One end of unidirectional breakover element is electrically coupled to the 3rd transistorized alternate path end, and the other end receives reference signal because of the electric property coupling relation; Electric capacity is electrically coupled between the control end of the 3rd transistorized alternate path end and transistor seconds.Moreover reference signal can make the not conducting because of reverse biased of unidirectional breakover element in a certain period.
In one embodiment of this invention, the unidirectional breakover element of above-mentioned display device is a diode.
In one embodiment of this invention, the unidirectional breakover element of above-mentioned display device is the 4th transistor, the 4th transistorized control end and first path terminal receive reference signal because of the electric property coupling relation simultaneously, and the 4th transistorized alternate path end is electrically coupled to the 3rd transistorized alternate path end.
The embodiment of the invention designs by the structural arrangements to LED driving circuit, make LED driving circuit comprise a plurality of transistors, and the transistor that for example connects of unidirectional breakover element in the diode mode, see through under the specific connected mode and control mode and the very little insignificant prerequisite of manufacturing process difference between each transistor based on adjacent transistors, glow phase at light emitting diode, the electric current of light emitting diode and transistorized critical voltage and the preset potential size of flowing through is irrelevant substantially, therefore can suppress manufacturing process factor and supply voltage and fall influence electric current, reach the effect of preferable compensation, and then can improve effectively that panel shows uneven problem in the prior art.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 illustrates the synoptic diagram into the single image element circuit of traditional light emitting display device.
Fig. 2 shows the structural representation of a kind of display device that is relevant to the embodiment of the invention.
Fig. 3 shows the sequential chart of a plurality of signals that are relevant to LED driving circuit shown in Figure 2.
Fig. 4 a and Fig. 4 b illustrate the critical voltage migration effect simulation figure of LED driving circuit shown in Figure 1 and LED driving circuit shown in Figure 2 respectively.
The compensation effect simulation drawing falls in the supply voltage that Fig. 5 a and Fig. 5 b illustrate LED driving circuit shown in Figure 1 and LED driving circuit shown in Figure 2 respectively.
Drawing reference numeral:
10: image element circuit
12: LED driving circuit
16: Organic Light Emitting Diode
Vdata: data-signal
SCAN: control signal
OVDD, OVSS: power supply potential
M1, M2: transistor
C1: electric capacity
20: display device
21: power supply device
23: light emitting source
230: light emitting module
232: Organic Light Emitting Diode
234: LED driving circuit
EM: control signal
Vref: reference signal
M3, M4: transistor
C: electric capacity
A, G: node
V1, V2: the value of reference signal
T1, T2: period
Embodiment
Referring to Fig. 2, it shows the structural representation of a kind of display device that is relevant to the embodiment of the invention.As shown in Figure 2, display device 20 comprises power supply device 21 and light emitting source 23.Wherein, power supply device 21 is in order to provide electric power for example power supply potential OVDD and OVSS; Light emitting source 23 is electrically coupled to power supply device 21 to accept power supply potential OVDD and OVSS.Particularly, light emitting source 23 comprises at least one light emitting module 230, and present embodiment illustrates two with as an example, but and unrestricted the present invention.
Each light emitting module 230 comprises light emitting diode for example Organic Light Emitting Diode 232 and LED driving circuit 234.LED driving circuit 234 comprises a plurality of transistor M1, M2, M3, M4 and capacitor C.In the present embodiment, transistor M1, M2, M3 and M4 all use as switch, and grid, drain electrode and the source electrode of each transistor M1, M2, M3 and M4 are respectively the control end of switch, first path terminal and alternate path end; And whether transistor M1, M2, M3 and M4 constitute in order to decision makes electric current flow through the switch module of Organic Light Emitting Diode 232; Further, transistor M4 is arranged in the LED driving circuit 234 with diode connected mode (that is, electrically connect at the grid of this transistor M4 and source electrode) and as unidirectional breakover element.In addition, transistor M1 and M3 are the N transistor npn npn, and transistor M2 and M4 are the P transistor npn npn, but the present invention is not as limit.
More specifically, the control of the grid suspension control signal SCAN of transistor M1 is with the drain electrode of transistor M1 and the state that electrically conducts between the source electrode, and the drain electrode of transistor M1 receives data-signal Vdata because of the electric property coupling relation.The grid of transistor M2 is electrically coupled to the source electrode of transistor M1, the power supply potential OVDD that is provided by power supply device 21 is provided the source electrode of transistor M2, the drain electrode of transistor M2 is electrically coupled to the positive pole of Organic Light Emitting Diode 232, and another power supply potential OVSS that is provided by power supply device 21 is provided the negative pole of Organic Light Emitting Diode 232, at this, OVDD is greater than OVSS.The control of the grid suspension control signal EM of transistor M3 is with the drain electrode of decision transistor M3 and the state that electrically conducts between the source electrode, and the drain electrode of transistor M3 is electrically coupled to power supply potential OVDD.The drain electrode of transistor M4 is electrically coupled to the source electrode of transistor M3, and the grid of transistor M4 and source electrode all receive reference signal Vref because of the electric property coupling relation.Capacitor C is electrically coupled between the grid of the source electrode of transistor M3 and transistor M2, and at this, the electric connection point of capacitor C and transistor M3 is denoted as node A, and the electric connection point of capacitor C and transistor M2 is denoted as node G.
Need to prove in addition, the control signal SCAN that each light emitting module 230 is received among Fig. 2, EM, data-signal Vdata and reference signal Vref are with the similar elements symbology, but be not to be used for restriction: in the same period, the control signal SCAN of each light emitting module 230, the value of EM, data-signal Vdata and reference signal Vref is necessarily identical.
Describe the concrete start process of arbitrary LED driving circuit 234 in detail below in conjunction with Fig. 2 and Fig. 3, Fig. 3 shows the sequential chart of a plurality of signal SCAN, EM, Vdata and the Vref that are relevant to LED driving circuit 234.
Particularly, at T1 in the period, control signal SCAN is adjusted to high levle, the value that control signal EM and reference signal Vref all are adjusted to low level and reference signal Vref is V1, transistor M1 is in conducting state, transistor M4 (at this, that is unidirectional breakover element) also being in conducting state, transistor M3 is in cut-off state; At this moment, the current potential at node A place is (V1+Vth4), and the current potential at node G place is Vdata, and wherein Vth4 is the critical voltage of transistor M4.
At T2 in the period, control signal SCAN is adjusted to low level, the value that control signal EM and reference signal Vref all are adjusted to high levle and reference signal Vref is that V2 is (at this, V2 is greater than V1), transistor M3 is in conducting state, transistor M1 is in cut-off state, and transistor M4 can't conducting because of reverse biased; At this moment, the current potential at node A place is OVDD, and the current potential at node G place is [Vdata+OVDD-(V1+Vth4)], and the electric current I ds=k (Vsg-Vth) of Organic Light Emitting Diode 232 is flow through in transistor M2 conducting
2=k[(V1-Vdata)+(Vth4-Vth)]
2, wherein k is a constant, Vth is the critical voltage of transistor M2.At this,, can think Vth4=Vth so Ids=k (V1-Vdata) under the very little insignificant prerequisite of manufacturing process difference based on adjacent transistors to transistor M2 and the transistor M4 that is in same light emitting module 230
2This shows, electric current I ds that Organic Light Emitting Diode 232 is flow through when being in glow phase and transistorized critical voltage and supply voltage OVDD are irrelevant, can get rid of manufacturing process factor and supply voltage and fall influence electric current, reach the effect of compensation, and then can effectively improve the uneven problem of demonstration in the prior art.
In addition, can also find from Fig. 3 that in the start process of LED driving circuit 234, control signal SCAN and control signal EM are anti-phase, and reference signal Vref and control signal EM homophase.
Fig. 4 a and Fig. 4 b illustrate the critical voltage migration effect simulation figure of LED driving circuit 12 shown in Figure 1 and LED driving circuit 234 shown in Figure 2 respectively.The critical voltage that Fig. 4 a and 4b all show transistor M2 is Vth, negatively drifts to (Vth-0.3) and just drifting to Ids vs.Vdata family curve under (Vth+0.3) three kinds of situations.Can find that from Fig. 4 a and 4b the LED driving circuit 234 of the embodiment of the invention has preferable critical voltage migration effect.
The compensation effect simulation drawing falls in the supply voltage that Fig. 5 a and Fig. 5 b illustrate LED driving circuit 12 shown in Figure 1 and LED driving circuit 234 shown in Figure 2 respectively.The value that Fig. 5 a and 5b all show power supply potential is that OVDD, OVDD variation 5% and OVDD change Idsvs.Vdata family curve under 10% 3 kind of situation.Can find that from Fig. 5 a and 5b the LED driving circuit 234 of the embodiment of the invention has preferable supply voltage and falls compensation effect.
In sum, the embodiment of the invention designs by the structural arrangements to LED driving circuit, make LED driving circuit comprise a plurality of transistors, and the transistor that for example connects of unidirectional breakover element in the diode mode, see through under the specific connected mode and control mode and the very little insignificant prerequisite of manufacturing process difference between each transistor based on adjacent transistors, glow phase at light emitting diode, the electric current of light emitting diode and transistorized critical voltage and the power supply potential size of flowing through is irrelevant substantially, therefore can suppress manufacturing process factor and supply voltage and fall influence electric current, reach the effect of preferable compensation, and then can improve effectively that panel shows uneven problem in the prior art.
In addition, anyly have the knack of this skill person and also can do suitably change LED driving circuit and driving method that the above embodiment of the present invention proposes, for example the transistor M4 in the LED driving circuit 234 is changed to diode, the positive pole of diode is electrically coupled to node A, and the negative pole of diode receives reference signal Vref because of the electric property coupling relation; Suitably change transistorized kind (P type or N type); And/or the electrical connection of each transistorized source electrode and drain electrode exchanged or the like.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim scope person of defining.
Claims (8)
1. LED driving circuit, it is characterized in that, described LED driving circuit is suitable for driving a light emitting diode, a plurality of transistors are arranged in the described LED driving circuit, each described transistor comprises control end, first path terminal and alternate path end respectively, and described LED driving circuit comprises:
One the first transistor, the control that the described control end of described the first transistor is subjected to one first signal is with described first path terminal that determines described the first transistor and the state that electrically conducts between the described alternate path end, and described first path terminal of described the first transistor receives a data-signal because of the electric property coupling relation;
One transistor seconds, the described control end of described transistor seconds is electrically coupled to the described alternate path end of described the first transistor, described first path terminal of described transistor seconds is electrically coupled to a preset potential, and the described alternate path end of described transistor seconds is electrically coupled to described light emitting diode;
One the 3rd transistor, the described the 3rd transistorized described control end is subjected to the control of a secondary signal to determine the state that electrically conducts between the described the 3rd transistorized described first path terminal and the described alternate path end, and the described the 3rd transistorized described first path terminal is electrically coupled to described preset potential;
One unidirectional breakover element, an end are electrically coupled to the described the 3rd transistorized described alternate path end, and the other end receives a reference signal because of the electric property coupling relation; And
One electric capacity is electrically coupled between the described control end of the described the 3rd transistorized described alternate path end and described transistor seconds,
Wherein, described reference signal can make the not conducting because of reverse biased of described unidirectional breakover element in a certain period.
2. LED driving circuit as claimed in claim 1 is characterized in that, wherein said unidirectional breakover element is a diode.
3. LED driving circuit as claimed in claim 1, it is characterized in that, wherein said unidirectional breakover element is one the 4th transistor, the described the 4th transistorized described control end and described first path terminal receive described reference signal because of the electric property coupling relation simultaneously, and the described the 4th transistorized described alternate path end is electrically coupled to the described the 3rd transistorized described alternate path end.
4. a LED driving method is characterized in that, described method is applicable to that in the LED driving circuit as claimed in claim 1, described LED driving method comprises:
In one first period, adjust described first signal, described secondary signal and described reference signal with described the first transistor of conducting and described unidirectional breakover element, and make described the 3rd transistor can't conducting; And
In one second period after described first period, adjust described first signal, described secondary signal and described reference signal, and make described the first transistor and the described unidirectional breakover element can't conducting with described the 3rd transistor of conducting,
Wherein, in described second period, described unidirectional breakover element is because reverse biased and can't conducting.
5. LED driving method as claimed in claim 4 is characterized in that, wherein said first signal and described secondary signal are anti-phase, and described reference signal and described secondary signal homophase.
6. a display device is characterized in that, described display device comprises:
One power supply device is in order to provide electric power; And
One light emitting source is electrically coupled to described power supply device to accept electric power, and described light emitting source comprises at least one light emitting module, and described light emitting module comprises:
One light emitting diode; And
One LED driving circuit has a plurality of transistors in the described LED driving circuit, each described transistor comprises control end, first path terminal and alternate path end respectively, and described LED driving circuit comprises:
One the first transistor, the control that the described control end of described the first transistor is subjected to one first signal is with described first path terminal that determines described the first transistor and the state that electrically conducts between the described alternate path end, and described first path terminal of described the first transistor receives a data-signal because of the electric property coupling relation;
One transistor seconds, the described control end of described transistor seconds is electrically coupled to the described alternate path end of described the first transistor, a preset potential that is provided by described power supply device is provided described first path terminal of described transistor seconds, and the described alternate path end of described transistor seconds is electrically coupled to described light emitting diode;
One the 3rd transistor, the described the 3rd transistorized described control end is subjected to the control of a secondary signal to determine the state that electrically conducts between the described the 3rd transistorized described first path terminal and the described alternate path end, and the described the 3rd transistorized described first path terminal is electrically coupled to described preset potential;
One unidirectional breakover element, an end are electrically coupled to the described the 3rd transistorized described alternate path end, and the other end receives a reference signal because of the electric property coupling relation; And
One electric capacity is electrically coupled between the described control end of the described the 3rd transistorized described alternate path end and described transistor seconds,
Wherein, described reference signal can make the not conducting because of reverse biased of described unidirectional breakover element in a certain period.
7. display device as claimed in claim 6 is characterized in that, wherein said unidirectional breakover element is a diode.
8. display device as claimed in claim 6, it is characterized in that, wherein said unidirectional breakover element is one the 4th transistor, the described the 4th transistorized described control end and described first path terminal receive described reference signal because of the electric property coupling relation simultaneously, and the described the 4th transistorized described alternate path end is electrically coupled to the described the 3rd transistorized described alternate path end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010171184XA CN101826301B (en) | 2010-04-28 | 2010-04-28 | Light emitting diode drive circuit as well as driving method and display device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010171184XA CN101826301B (en) | 2010-04-28 | 2010-04-28 | Light emitting diode drive circuit as well as driving method and display device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101826301A true CN101826301A (en) | 2010-09-08 |
| CN101826301B CN101826301B (en) | 2012-06-27 |
Family
ID=42690199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010171184XA Active CN101826301B (en) | 2010-04-28 | 2010-04-28 | Light emitting diode drive circuit as well as driving method and display device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101826301B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017041444A1 (en) * | 2015-09-08 | 2017-03-16 | 京东方科技集团股份有限公司 | Organic light-emitting diode driving circuit and driving method |
| CN111653230A (en) * | 2020-07-29 | 2020-09-11 | 上海天马微电子有限公司 | Light-emitting panel and display device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312535A (en) * | 2000-03-06 | 2001-09-12 | Lg电子株式会社 | Active driving circuit of display plate |
| US20030184509A1 (en) * | 2002-03-22 | 2003-10-02 | Industrial Technology Research Institute | Pixel circuit for active matrix of current driving device |
| CN1551080A (en) * | 2003-05-12 | 2004-12-01 | 松下电器产业株式会社 | Current driving device and display device |
| CN1588521A (en) * | 2004-09-08 | 2005-03-02 | 友达光电股份有限公司 | Organic light-emitting display and its display unit |
| CN101179881A (en) * | 2006-11-09 | 2008-05-14 | 中华映管股份有限公司 | Organic LED driving mechanism |
| CN101276544A (en) * | 2007-03-28 | 2008-10-01 | 奇景光电股份有限公司 | Pixel circuit |
-
2010
- 2010-04-28 CN CN201010171184XA patent/CN101826301B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312535A (en) * | 2000-03-06 | 2001-09-12 | Lg电子株式会社 | Active driving circuit of display plate |
| US20030184509A1 (en) * | 2002-03-22 | 2003-10-02 | Industrial Technology Research Institute | Pixel circuit for active matrix of current driving device |
| CN1551080A (en) * | 2003-05-12 | 2004-12-01 | 松下电器产业株式会社 | Current driving device and display device |
| CN1588521A (en) * | 2004-09-08 | 2005-03-02 | 友达光电股份有限公司 | Organic light-emitting display and its display unit |
| CN101179881A (en) * | 2006-11-09 | 2008-05-14 | 中华映管股份有限公司 | Organic LED driving mechanism |
| CN101276544A (en) * | 2007-03-28 | 2008-10-01 | 奇景光电股份有限公司 | Pixel circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017041444A1 (en) * | 2015-09-08 | 2017-03-16 | 京东方科技集团股份有限公司 | Organic light-emitting diode driving circuit and driving method |
| US9877372B2 (en) | 2015-09-08 | 2018-01-23 | Boe Technology Group Co., Ltd. | Driving circuit and driving method of organic light emitting diode |
| CN111653230A (en) * | 2020-07-29 | 2020-09-11 | 上海天马微电子有限公司 | Light-emitting panel and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101826301B (en) | 2012-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105225626B (en) | Organic light-emitting diode pixel drive circuit, its display panel and display device | |
| CN103208255B (en) | Pixel circuit, driving method for driving the pixel circuit and display device | |
| CN103218972B (en) | Image element circuit, pixel circuit drive method and display device | |
| US9262966B2 (en) | Pixel circuit, display panel and display apparatus | |
| US9496293B2 (en) | Pixel circuit and method for driving the same, display panel and display apparatus | |
| CN105185305A (en) | Pixel circuit, driving method thereof and related device | |
| US9257074B2 (en) | Pixel compensation circuit | |
| CN104021754B (en) | A kind of image element circuit, organic EL display panel and display device | |
| WO2019000960A1 (en) | Display panel, display device, and control method for display panel | |
| US9514680B2 (en) | OLED pixel driving circuit with compensation circuitry for uniform brightness | |
| JP6942816B2 (en) | Display panel, pixel drive circuit and its drive method | |
| CN103927990A (en) | Pixel circuit of organic light-emitting displayer, driving method of pixel circuit and organic light-emitting displayer | |
| CN104240644B (en) | Light emitting diode pixel circuit and driving method thereof | |
| CN104809989A (en) | Pixel circuit, drive method thereof and related device | |
| CN104217682A (en) | Pixel circuit, organic electroluminescent display panel and display device | |
| CN102956185B (en) | Pixel circuit and display device | |
| CN104464616A (en) | Pixel circuit, drive method thereof and display panel | |
| CN108877649B (en) | Pixel circuit, driving method thereof and display panel | |
| CN101859539A (en) | Drive circuit for current drive element and drive method | |
| CN104217681A (en) | Pixel circuit, display panel and display device | |
| CN101286297A (en) | Organic light-emitting display and its drive method | |
| CN103000131A (en) | Pixel circuit and drive method, display panel and display device thereof | |
| CN106297663B (en) | A kind of image element circuit, its driving method and relevant apparatus | |
| CN104505024A (en) | Display driving method, display panel and display device | |
| CN104821155A (en) | Backlight unit and display apparatus having the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |