CN101730333A - Pixel driving circuit of light-emitting diode - Google Patents
Pixel driving circuit of light-emitting diode Download PDFInfo
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- CN101730333A CN101730333A CN200810171133A CN200810171133A CN101730333A CN 101730333 A CN101730333 A CN 101730333A CN 200810171133 A CN200810171133 A CN 200810171133A CN 200810171133 A CN200810171133 A CN 200810171133A CN 101730333 A CN101730333 A CN 101730333A
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Abstract
A pixel driving circuit of a light-emitting diode (LED) comprises a storage capacitor, a first commutation circuit and a driving element, wherein the storage capacitor comprises a first node and a second node; the second node receives signal voltage in a first period and the first node receives reference voltage during a second period of the first period; the first commutation circuit isolates the first node and a fixed voltage source in the first period and conducts the first node and the fixed voltage source after the first period to provide fixed voltage for the first node; and the driving element outputs drive current which is not related to the fixed voltage after the first period.
Description
Technical field
The present invention relates to the pixel-driving circuit of a kind of pixel-driving circuit, particularly a kind of Organic Light Emitting Diode, more especially the drive circuit of active organic light-emitting diode (AMOLED).
Background technology
The active organic light-emitting diode technology is regarded as one of prospective display technology of tool always, therefore characteristics such as frivolous, high color saturation, self-luminous, reaction time are fast because active organic light-emitting diode possesses, high-contrast and deflection are considered to become next dominant position of display technology from generation to generation.
Fig. 1 shows known Organic Light Emitting Diode " 2T1C " pixel-driving circuit, just only uses two thin-film transistor M1, M2 and a capacitor C st to drive for each pixel.Though the framework of 2T1C is simple, there is the problem of panel luminance inequality.Except the component characteristic change of transistor own, because each locations of pixels difference also can cause pressure drop (voltage drop) difference of power supply supply.Because the grid-source voltage (V of transistor M2
GS) be data voltage (V
Data) supply voltage (V with power supply
Dd) poor, and when the supply voltage (V
Dd) not simultaneously, the brightness that light-emitting element E L produced is also different.Also mentioned identical problem in applicant's the Application No. 2006/0023551, but still be to utilize the mode of voltage compensation to solve, comparatively complicated in the enforcement, also need too much transistor.
Therefore, be necessary to provide a kind of pixel-driving circuit of new light-emitting diode, wherein adopt a kind of simple, implement the problem that energy-conservation again mode solves the pixel intensity inequality easily.
Summary of the invention
Disappearance in view of prior art, the invention provides a kind of pixel-driving circuit of Organic Light Emitting Diode, wherein characteristics are that storage capacitors links by commutation circuit and power supply supply, another characteristics are storage capacitors again by the binding of another commutation circuit and reference voltage source, and reference voltage source and power supply supply are separately independently on panel.The present invention utilizes simple design, can reach above-mentioned purpose, and compared to prior art, mode proposed by the invention is implemented simply also can not increase manufacturing cost and time.
In embodiments of the present invention, provide a kind of pixel-driving circuit of Organic Light Emitting Diode, it comprises storage capacitors, first commutation circuit and driving element.Storage capacitors has first node and Section Point, and wherein Section Point receives data voltage between the first phase, and the second phase of first node between the first phase receives reference voltage.First commutation circuit blocks this first node and fixed voltage source between the first phase, after between this first phase then conducting first node and fixed voltage source to provide fixed voltage to first node.Driving element after between this first phase, output and the irrelevant drive current of fixed voltage.Particularly first commutation circuit can be the PMOS transistor, second commutation circuit can be nmos pass transistor, the 3rd commutation circuit can be nmos pass transistor and driving element can be the PMOS transistor, and after between this first phase, the grid-source voltage of driving element and fixed voltage are irrelevant.
In addition, in another embodiment, pixel-driving circuit also comprises second commutation circuit and the 3rd commutation circuit.Second commutation circuit responds first sweep signal that first scan line imports and opens between this first phase, make Section Point receive data voltage from data wire.The 3rd commutation circuit responded second sweep signal that second scan line imports and opens in the second phase, made first node from receiving reference voltage.
In addition, the present invention proposes a kind of display, comprises display floater and controller, and wherein display floater comprises pel array, and pel array comprises a plurality of above-mentioned pixel-driving circuits, and the drive current of each pixel-driving circuit is roughly the same.The present invention also proposes a kind of electronic installation, comprises above-mentioned display.
Cooperate narration and the graphic explanation of following preferred embodiment, purpose of the present invention, embodiment, feature, and advantage will be more clear.
Description of drawings
Fig. 1 shows known pixel-driving circuit;
Fig. 2 shows the electronic installation of one embodiment of the invention; And
Fig. 3 a to 3f shows the pixel-driving circuit of the embodiment of the invention.
Embodiment
Fig. 2 shows the electronic installation 10 of one embodiment of the invention.Those skilled in the art should know, electronic installation 10 can comprise, but be not limited to, for example mobile phone, digital camera, personal digital assistant, mobile computer, desktop PC, TV, global positioning system, automobile-used display, aviation display, digital frame or Portable DVD projector or the like.In the present embodiment, electronic installation 10 can comprise display 20 and the controller 25 with active organic light-emitting diode (AMOLED) formula, display floater 21 on the display 20, and has effective viewing area 22 on the display floater 21, pel array 23 is positioned at effective viewing area 22 and contains a plurality of data wires and scan line, and the running that controller 25 is used for controlling pel array 23 a plurality of pixel-driving circuits is with show image, after detail will be described in.What deserves to be mentioned is that graphic in this specification is in order to explain the present invention, ratio in graphic and the relative position between size and each assembly, only for reference, should not be used for limiting the present invention.
Fig. 3 a shows the pixel-driving circuit 300a of one embodiment of the invention.Pixel-driving circuit 300a comprise storage capacitors Cst, first commutation circuit 310, second commutation circuit 320, the 3rd commutation circuit 330, with driving element 305.First commutation circuit 310 is positioned at the fixed voltage source V of capacitor C st first node A and panel 21
DdBetween.It should be noted that fixed voltage source V
Dd, for example about 5 volts, but actual value can change to some extent along with locations of pixels and be difficult to determine.Second commutation circuit 320 is between the data wire Data of capacitor C st Section Point B and panel 21.The 3rd commutation circuit 330 is positioned at the reference voltage source V of capacitor C st first node A and panel 21
RefBetween.Driving element 305 can be embodied as the PMOS transistor, is positioned at the fixed voltage source V of panel 21
DdAnd between the light-emitting element E L, the source electrode of PMOS transistor 305 connects fixed voltage source so far, and grid connects Section Point B, and drain electrode then connects light-emitting element E L.
In addition, in Fig. 3 a, storage capacitors Cst, first commutation circuit 310, second commutation circuit 320, driving element 305 are arranged in effective viewing area (ActiveArea) AA of panel 21, but the 3rd commutation circuit 330 is positioned at outside effective viewing area AA, and be positioned at panel 21 around, and one the 3rd commutation circuit 330 can be used for a plurality of pixels.
What deserves to be mentioned is fixed voltage source V
DdWith reference voltage source V
RefIndependently of one another on panel 21, that is to say without any direct electrically connect, and flexible circuit board is not used to provide fixed voltage source V on (figure shows)
DdWith reference voltage source V
RefPin (pin) also be different.
Below will describe the function mode of pixel-driving circuit 300a in detail.At first P1 between the first phase responds the first switching signal CS 1 and transfers out current potential to by closing current potential, and first commutation circuit 310 opens circuit to block the fixed voltage source V of capacitor C st first node A and panel 21
Dd, transferring to and close current potential by opening current potential and respond the second switching signal CS2,320 short circuits of second commutation circuit are with the data wire Data of conducting capacitor C st Section Point B and panel 21.
After P1 begins between the first phase, then at second phase P2, respond the 3rd switching signal CS3 and transfer to and close current potential by opening current potential, 330 short circuits of the 3rd commutation circuit are with the reference voltage source V of conducting capacitor C st first node A and panel 21
Ref, make first node A receive reference voltage V from reference voltage source
RefIn this embodiment, between the first phase P1 begin with second phase P2 begin interval greater than 50ns, and second phase P2 continues at least 0.5 μ s.Then, respond a frequency signal (figure does not show), data wire Data writes data voltage V
DataTo Section Point B, so the stored voltage of capacitor C st is that data voltage deducts reference voltage (V
Data-V
Ref).
Afterwards, when second phase P2 end, the 3rd switching signal CS3 transfers out current potential to by closing current potential, and the 3rd commutation circuit 330 opens circuit.Then, P1 finishes when between the first phase, and the first switching signal CS1 transfers to and closes current potential by opening current potential, and the second switching signal CS2 transfers out current potential to by closing current potential, second commutation circuit 320 is for opening circuit, but first commutation circuit 310 is short circuit, makes first node A and fixed voltage source V
DdConducting, and the voltage of first node A becomes V
DdBut simultaneously in order to keep the stored voltage of capacitor C st, so the voltage of Section Point B becomes (V
Dd+ V
Data-V
Ref).In this embodiment, P1 finishes between the time that finishes of second phase P2 and the first phase interval greater than 50ns.
And the grid of PMOS transistor 305 links to each other with Section Point B, and its grid voltage is (V
Dd+ V
Data-V
Ref), and the source electrode of PMOS transistor 305 and fixed voltage source V
DdLink, its source voltage is V
Dd, so the grid-source voltage V of PMOS transistor 305
GSBe (V
Data-V
Ref), with fixed voltage V
DdIrrelevant, and then the electric current that 305 drain electrodes of PMOS transistor are exported can be because of fixed voltage source V yet
DdPressure drop and change, make on the panel that 20 all pixel intensity are even.
Compared to pixel-driving circuit 300a, the storage capacitors Cst of pixel-driving circuit 300b shown in Fig. 3 b, first commutation circuit 310, second commutation circuit 320, the 3rd commutation circuit 330, driving element 305 all are arranged in effective viewing area AA of panel 21, in addition setting and running are identical with the pixel-driving circuit 300a of Fig. 3 a, do not repeat them here.
Fig. 3 c and 3d show other embodiment.Compared to Fig. 3 a or Fig. 3 b, pixel-driving circuit 300c also comprises one the 4th commutation circuit 340 among Fig. 3 c, between driving element 305 and light-emitting element E L, and open circuit or short circuit because of responding the 4th switching signal CS4, and in this embodiment, the 4th switching signal CS4 is identical with the aforementioned first switching signal CS 1, be short circuit and work as first commutation circuit 310, the 4th commutation circuit 340 also is short circuit, and works as first commutation circuit 310 for opening circuit, and the 4th commutation circuit 340 is also for opening circuit.In addition, in Fig. 3 c, first commutation circuit 310 and the 3rd commutation circuit 330 all are positioned at outside effective viewing area AA.
And compared to Fig. 3 a or Fig. 3 b, pixel-driving circuit 300d also comprises the 5th commutation circuit 350 among Fig. 3 d, is positioned at driving element 305 and fixed voltage source V
DdBetween, and respond the 5th switching signal CS5 and open circuit or short circuit, and in this embodiment, the 5th switching signal CS5 is identical with the aforementioned first switching signal CS1, be short circuit and work as first commutation circuit 310, the 5th commutation circuit 350 also is short circuit, and works as first commutation circuit 310 for opening circuit, and the 5th commutation circuit 350 is also for opening circuit.In addition, in Fig. 3 d, first commutation circuit 310 and the 3rd commutation circuit 330 all are positioned at outside effective viewing area AA.
And among the pixel-driving circuit 300e in Fig. 3 e, first commutation circuit 310 is the PMOS transistor, and second commutation circuit 320 is a nmos pass transistor, and the 3rd commutation circuit 330 is the PMOS transistor for nmos pass transistor driving element 305.Those skilled in the art should know that the present invention is not limited to the above embodiments.
In addition, in Fig. 3 e, PMOS transistor 310, nmos pass transistor 320, PMOS transistor 305 are arranged in effective viewing area AA of panel 21, but nmos pass transistor 330 is positioned at outside effective viewing area AA of panel 21, and be positioned at panel 21 around, the framework that also is called 3T1C, and a nmos pass transistor 330 can use for a plurality of pixels, wherein PMOS transistor 310, nmos pass transistor 320, nmos pass transistor 330, PMOS transistor 305 are all thin-film transistor (TFT); But in the pixel-driving circuit 300f shown in Fig. 3 f, PMOS transistor 310, nmos pass transistor 320, nmos pass transistor 330, PMOS transistor 305 all are arranged in effective viewing area AA of panel 21, the framework that also is called 4T1C, in addition setting and running are identical with Fig. 3 e, do not repeat them here.
At first first scan line SCAN1 P1 current potential between the first phase is drawn high and is exported first sweep signal to the grid of PMOS transistor 310 and the grid of nmos pass transistor 320, to close PMOS transistor 310 but open nmos pass transistor 320.
After P1 began between the first phase, the second scan line SCAN2 then drew high and exports the grid of second sweep signal to nmos pass transistor 330 at second phase P2 current potential, to open nmos pass transistor 330, made first node A from reference voltage source reception reference voltage V
Ref, then, responding a frequency signal (figure does not show), data wire Data writes data voltage V
DataTo Section Point B, so the stored voltage of capacitor C st is that data voltage deducts reference voltage (V
Data-V
Ref).
Afterwards, the second scan line SCAN2 current potential is left behind, and second phase P2 finishes, and nmos pass transistor 330 is closed.Then, the first scan line SCAN1 current potential is left behind, and P1 finishes between the first phase, and nmos pass transistor 320 is closed, but PMOS transistor 310 opens, and makes first node A and fixed voltage source V
DdConducting, and the voltage of first node A becomes V
DdBut simultaneously in order to keep the stored voltage of capacitor C st, so the voltage of Section Point B becomes (V
Dd+ V
Data-V
Ref).
And the grid of PMOS transistor 305 links to each other with Section Point B, and its grid voltage is (V
Dd+ V
Data-V
Ref), and the source electrode of PMOS transistor 305 and fixed voltage source V
DdLink, its source voltage is V
Dd, so the grid-source voltage V of PMOS transistor 305
GSBe (V
Data-V
Ref), with fixed voltage V
DdIrrelevant, and then the electric current that 305 drain electrodes of PMOS transistor are exported can be because of fixed voltage source V yet
DdPressure drop and change, make on the panel that 20 all pixel intensity are even.
By above setting, the invention provides a kind of new pixel-driving circuit, display floater and electronic installation.But the above is the preferred embodiments of the present invention only, is not in order to limit claim of the present invention; All other change or modify not breaking away from the equivalence finished under the disclosed spirit, all should be included in the following claim.
Symbol description
Transistor M1, M2 electronic installation 10
Display 20 display floaters 21
Effective display area territory AA pel array 23
Driving element, PMOS transistor 305
First commutation circuit, PMOS transistor 310
Second commutation circuit, nmos pass transistor 320
The 3rd commutation circuit, nmos pass transistor 330
The 4th commutation circuit 340 the 5th commutation circuit 350
Storage capacitors Cst light-emitting element E L
Switching signal CS1-CS5 scan line Scan1, Scan2.
Claims (10)
1. the pixel-driving circuit of a light-emitting diode comprises:
One storage capacitors has a first node and a Section Point, and wherein said Section Point receives a data voltage between a first phase, and the second phase of described first node between the described first phase receives a reference voltage;
One first commutation circuit, between a described first node and a fixed voltage source, wherein described first commutation circuit blocks described first node and described fixed voltage source between the described first phase, and then described described first node of the first commutation circuit conducting and described fixed voltage source are to provide a fixed voltage to described first node after between the described first phase; And
One driving element links with described fixed voltage source and described Section Point respectively, and after between the described first phase, described driving element produces and the irrelevant drive current of described fixed voltage.
2. pixel-driving circuit according to claim 1, wherein, described first commutation circuit be a thin-film transistor and have one first end, one second end, with one the 3rd end;
Wherein, described first end links described fixed voltage source, described second end links described first node, and described the 3rd end links one first scan line, and described first commutation circuit responds one first sweep signal that described first scan line imports and closes between the described first phase.
3. pixel-driving circuit according to claim 1 also comprises one second commutation circuit, between a data wire and described Section Point;
Wherein, described second commutation circuit was opened between the described first phase, made described Section Point receive described data voltage from described data wire.
4. pixel-driving circuit according to claim 3, wherein, described second commutation circuit be a thin-film transistor and also have one first end, one second end, with one the 3rd end, described first end links described data wire, described second end links described Section Point, described the 3rd end links one first scan line, and wherein said second commutation circuit responds one first sweep signal that described first scan line imports and opens between the described first phase.
5. pixel-driving circuit according to claim 1, wherein, the grid-source voltage of described driving element is the poor of described data voltage and described reference voltage.
6. pixel-driving circuit according to claim 1 also comprises one the 3rd commutation circuit, between a reference voltage source and described first node;
Wherein, described the 3rd commutation circuit was opened in the described second phase, made described first node receive described reference voltage from described reference voltage source.
7. pixel-driving circuit according to claim 6, wherein, described the 3rd commutation circuit be a thin-film transistor and also have one first end, one second end, with one the 3rd end, described first end links described reference voltage source, described second end links described first node, described the 3rd end links one second scan line, and wherein said the 3rd commutation circuit responds one second sweep signal that described second scan line imports in the described second phase and opens.
8. pixel-driving circuit according to claim 1, wherein, the time that begins between the described first phase and the described second phase begin interval greater than 50ns, the described second phase continues at least 0.5 μ s, and finish between the time that finishes described second phase and the described first phase interval greater than 50ns.
9. display comprises:
One pel array comprises a plurality of as each described pixel-driving circuit in the claim 1 to 8;
One controller links with described pel array, controls the running of described a plurality of pixel-driving circuits.
10. electronic installation, comprise display as claimed in claim 9, described electronic installation is a mobile phone, a digital camera, a personal digital assistant, a notebook computer, a desktop PC, a TV, a global positioning system, an automobile-used display, an aviation display, a digital frame or a Portable DVD projector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810171133A CN101730333A (en) | 2008-10-15 | 2008-10-15 | Pixel driving circuit of light-emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810171133A CN101730333A (en) | 2008-10-15 | 2008-10-15 | Pixel driving circuit of light-emitting diode |
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| Publication Number | Publication Date |
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| CN101730333A true CN101730333A (en) | 2010-06-09 |
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|---|---|---|---|
| CN200810171133A Pending CN101730333A (en) | 2008-10-15 | 2008-10-15 | Pixel driving circuit of light-emitting diode |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104919900A (en) * | 2012-12-17 | 2015-09-16 | 勒克斯维科技公司 | Smart pixel lighting and display microcontroller |
| CN105225638A (en) * | 2014-06-06 | 2016-01-06 | 伊格尼斯创新公司 | For the image element circuit of displayer |
| US9558721B2 (en) | 2012-10-15 | 2017-01-31 | Apple Inc. | Content-based adaptive refresh schemes for low-power displays |
| CN111243480A (en) * | 2020-01-17 | 2020-06-05 | 昆山国显光电有限公司 | Display panel driving method and display device |
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| 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 |
| JP2007323040A (en) * | 2006-06-01 | 2007-12-13 | Lg Philips Lcd Co Ltd | Organic light-emitting diode display device and driving method thereof |
| TW200839710A (en) * | 2007-03-29 | 2008-10-01 | Novatek Microelectronics Corp | Driving device of display device and related method |
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Patent Citations (3)
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| 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 |
| JP2007323040A (en) * | 2006-06-01 | 2007-12-13 | Lg Philips Lcd Co Ltd | Organic light-emitting diode display device and driving method thereof |
| TW200839710A (en) * | 2007-03-29 | 2008-10-01 | Novatek Microelectronics Corp | Driving device of display device and related method |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9558721B2 (en) | 2012-10-15 | 2017-01-31 | Apple Inc. | Content-based adaptive refresh schemes for low-power displays |
| CN104919900A (en) * | 2012-12-17 | 2015-09-16 | 勒克斯维科技公司 | Smart pixel lighting and display microcontroller |
| CN104919900B (en) * | 2012-12-17 | 2017-01-18 | 苹果公司 | Smart pixel lighting and display microcontroller |
| US9626908B2 (en) | 2012-12-17 | 2017-04-18 | Apple Inc. | Smart pixel lighting and display microcontroller |
| US9959815B2 (en) | 2012-12-17 | 2018-05-01 | Apple Inc. | Smart pixel lighting and display microcontroller |
| US10380952B2 (en) | 2012-12-17 | 2019-08-13 | Apple Inc. | Smart pixel lighting and display microcontroller |
| US10796648B2 (en) | 2012-12-17 | 2020-10-06 | Apple Inc. | Smart pixel lighting and display microcontroller |
| US11837179B2 (en) | 2012-12-17 | 2023-12-05 | Apple Inc. | Smart pixel lighting and display microcontroller |
| CN105225638A (en) * | 2014-06-06 | 2016-01-06 | 伊格尼斯创新公司 | For the image element circuit of displayer |
| CN105225638B (en) * | 2014-06-06 | 2019-06-07 | 伊格尼斯创新公司 | Pixel circuit for displayer |
| CN111243480A (en) * | 2020-01-17 | 2020-06-05 | 昆山国显光电有限公司 | Display panel driving method and display device |
| CN111243480B (en) * | 2020-01-17 | 2022-05-24 | 昆山国显光电有限公司 | Display panel driving method and display device |
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Application publication date: 20100609 |