CN1440014A - Driving circuit in display screen - Google Patents
Driving circuit in display screen Download PDFInfo
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- CN1440014A CN1440014A CN02105221A CN02105221A CN1440014A CN 1440014 A CN1440014 A CN 1440014A CN 02105221 A CN02105221 A CN 02105221A CN 02105221 A CN02105221 A CN 02105221A CN 1440014 A CN1440014 A CN 1440014A
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Abstract
A driving circuit for display includes data signal electrode to export data signal, scanning signal electrode to export scanning signal, luminous diode negative electrode being connected to a power supply device having the first potential, capacity having the first end and the second end and each switching having its the first end and the second end, the first end of the first switch to be connected to data signal electrode to receive the data signal and the secone end being connected to the first end of the capacity, the first end of the second switch to be connected to the powr supply device having the second potential, the second end of the second switch to be connected to positive electrode of the luminous diode, the first end of the third switch to be connected to the power supply device having the third potential and the second end of the third switch to be connected to the second end of the capacity.
Description
Technical field
The present invention relates to a kind of array circuit of display, the driving circuit of particularly a kind of active display device (Active Matrix Display) is applicable to the display that uses amorphous silicon (amorphoussilicon) transistor as driven unit.
Background technology
Fig. 1 has represented the driving circuit of a traditional monitor.Driving circuit 1 has comprised a data-signal electrode 11, one scan signal electrode 12 and a plurality of display unit of being made up of transistor 131,132, electric capacity 134, light emitting diode 133 (display cell).For convenience of description, only show four display units among the 1st figure.Data-signal electrode 11 and scan signal electrode 12 are respectively applied for outputting data signals and sweep signal.In each display unit, after the grid reception of sweep signal via transistor 131, transistor 131 conductings, and make data-signal be sent to the grid of transistor 132 via the transistor 131 of conducting.At this moment, the current potential of data-signal will be stored on the electric capacity 134, and the whether conducting of decision transistor 132, the electric current of light emitting diode 133 if transistor 132 conductings are then flowed through generation and make it luminous, otherwise light emitting diode 133 just keeps not luminance.So, via by the operation of column scan, and data-signal can be imported in each display unit, can determine the light and shade of each pixel or color and form a frame picture (frame) via the light emitting diode in each display unit whether luminous again.
In above-mentioned traditional circuit of display driving, because transistor 131 mainly act as a switchgear, its required drive current is little, therefore can utilize the transistor fabrication of amorphous silicon.But concerning transistor 132, because it is except the usefulness as switch, also must provide the magnitude of current that enough drive currents just can provide light emitting diode to reach luminance, so transistor 132 generally need use all the higher polysilicon of drive current providing capability (poly-silicon) transistor to make.But polycrystalline SiTFT needs more mask with regard to manufacture process, not only can raise the cost, and has also reduced yield rate.Therefore, will be more competitive if can use amorphous silicon material to make thin film transistor (TFT).
Yet, owing to following 2 reasons, make in traditional circuit of display driving, can't use amorphous silicon transistor fully.The first, the drive current deficiency that amorphous silicon transistor provides can't directly provide enough electric currents to make lumination of light emitting diode.The second, light emitting diode is positioned at the structure of transistor drain side, to the operating process of Organic Light Emitting Diode and be not suitable for.
Summary of the invention
In order to address the above problem, the invention provides a kind of driving circuit of display, applicable to the display of the transistor that uses amorphous silicon, make whole driving circuit all use the transistor of identical material and help the simplification of operating process as driven unit.
The object of the present invention is to provide a kind of driving circuit of display, it comprises a data-signal electrode, one scan signal electrode, an electric capacity, a light emitting diode and first, second, and the 3rd switch.Data-signal electrode outputting data signals.Scan signal electrode output scanning signal.The negative pole of light emitting diode is connected to a supply unit, and this supply unit has first current potential.First end of first switch is connected to the data-signal electrode and receives data-signal, and second end of first switch is connected to first end of electric capacity.First end of second switch is connected to supply unit, and this supply unit has second current potential, and second end of second switch is connected to the positive pole of light emitting diode.First end of the 3rd switch is connected to supply unit, and this supply unit has the 3rd current potential, and second end of the 3rd switch is connected to second end of this electric capacity.
First, second and third switch of the invention described above driving circuit can have the 3rd end respectively, wherein the 3rd end of the first and the 3rd switch is connected to scan signal electrode and receives sweep signal, and sweep signal is controlled the shutoff or the closure of this first and the 3rd switch thus.When this sweep signal made the first and the 3rd switch closure, data-signal was sent to electric capacity via first switch, and determines the voltage difference at these electric capacity two ends.And the 3rd end of second switch is connected to first end of this electric capacity, and is controlled the shutoff or the closure of this second switch by the voltage difference that these electric capacity two ends are had.
First, second and third switch of the invention described above driving circuit can comprise first, second and third transistor respectively, described transistor drain promptly is equivalent to first end of this first, second and third switch, source electrode promptly is equivalent to second end of this first, second and third switch, and grid promptly is equivalent to the 3rd end of this first, second and third switch.Second switch can also comprise four transistor in parallel with transistor seconds, to increase the electric current by this light emitting diode.
First, second and third transistor of the invention described above driving circuit can be amorphous silicon film transistor, and this light emitting diode can be an Organic Light Emitting Diode or polymer LED.
Thus, the present invention utilizes amorphous silicon transistor in parallel to provide light emitting diode required electric current, and the transistorized source electrode that provides drive current to use is provided light emitting diode, to be suitable for using the operating process of amorphous silicon transistor.Simultaneously between the source electrode of driving transistors and grid, connect the electric capacity that a voltage stabilizing is used, and between its source electrode and reference point of potential, increase by a switch, avoid the unstable problem that can't turn-off with driving transistors of electric current that is caused because of the adjustment of light emitting diode position.
Below, with regard to the embodiment of the driving circuit of description of drawings a kind of display of the present invention.
Description of drawings
Fig. 1 represents the driving circuit of a traditional monitor;
Fig. 2 represents the circuit of display driving in one embodiment of the invention.
Symbol description
11,21: the data-signal electrode; 12,2: scan signal electrode;
131,132: transistor; 133,235: light emitting diode;
134,234: electric capacity;
231: the first switches; 232: second switch; 233: the three switches;
M1: the first transistor; M21: transistor seconds; M3: the 3rd transistor;
M22: the 4th transistor; M23: the 5th transistor.
Embodiment
Fig. 2 represents the circuit of display driving in one embodiment of the invention.Driving circuit 2 has comprised a data-signal electrode 21, one scan signal electrode 22 and a plurality of display unit of being made up of switch 231,232,233, electric capacity 234, Organic Light Emitting Diode 235.For convenience of description, only show four display units among the 2nd figure.Data-signal electrode 21 and scan signal electrode 22 are respectively applied for outputting data signals and sweep signal.In each display unit, the negative pole of light emitting diode 235 (cathode) is connected to a supply unit (not shown), and this supply unit has the first current potential Vss.The first current potential Vss is negative potential Vss, and therefore, this light emitting diode has negative potential Vss.First end of first switch 231 is connected to data-signal electrode 21 and receives data-signal, and second end of first switch 231 is connected to first end of electric capacity 234.First end of second switch 232 is connected to the supply unit (not shown), and this supply unit has the second current potential V
DD, the second current potential V
DDBe positive potential V
DDSecond end of second switch 232 is connected to the positive pole (anode) of light emitting diode 235.First end of the 3rd switch 233 is connected to the supply unit (not shown), and this supply unit has the 3rd current potential Vref, and second end of the 3rd switch 233 is connected to second end of electric capacity 234.Therefore, be connected with electric capacity 234 between first switch 231 and the 3rd switch 233, by the sweep signal control of scan signal electrode 22 outputs, then controlled by a voltage difference Vgs at electric capacity 234 two ends jointly by second switch 232 for switch 231 and 233.
The drain electrode of the first transistor M1 is connected to data-signal electrode 21 and receives data-signal, and source electrode is connected to the grid of the second, the 4th, the 5th transistor M21, M22, M23, and grid is connected to scan signal electrode 22 and receives sweep signal.The source electrode of the 3rd transistor M3 is connected to the positive pole of light emitting diode 235, and drain electrode is connected to the supply unit (not shown) that the 3rd current potential Vref is provided, and grid is connected to scan signal electrode 22 and receives sweep signal.234 of electric capacity are connected between the grid and source electrode of the second, the 4th, the 5th transistor M21, M22, M23.
The operation of the driving circuit 2 of display in the present embodiment below will be described.
In each display unit, when scan signal electrode 22 output one has the sweep signal of high logic current potential and when making first switch 231 with second switch 233 closures (the first, the 3rd transistor M1, M3 conducting), data-signal electrode 21 is outputting data signals also, and being sent to an end of electric capacity 234 via first switch 231 (the first transistor M1 of conducting) of closure, the other end of electric capacity 234 then is connected with the supply unit (not shown) that the 3rd current potential Vref is provided because of the closure (conducting of the 3rd transistor M3) of the 3rd switch 233.So, the voltage difference Vgs at electric capacity 234 two ends is promptly determined by the current potential of data-signal and the difference of the 3rd current potential Vref.
At this moment, when data-signal has a logic low potential, this current potential will reach the gate terminal of the second, the 4th, the 5th transistor M21, M22, M23, the 3rd current potential Vref will reach the source terminal of the second, the 4th, the 5th transistor M21, M22, M23, voltage difference Vgs by control capacitance 234 makes second switch 232 disconnect (the second, the 4th, the 5th transistor M21, M22, M23 turn-off), and makes light emitting diode 235 will be in not luminance.
In addition, when data-signal has a logic high potential, second switch 232 closures (i.e. the second, the 4th, the 5th transistor M21, M22, M23 conducting), the electric current of the light emitting diode 235 of flowing through this moment will be jointly by the 3rd, second, the 4th, the 5th transistor M3, M21, M22, M23 decision.Because the second, the 4th, the 5th transistor M21, M22, M23 parallel with one another provides and have high drive current, be enough to sternly give birth to the magnitude of current that makes light emitting diode 235 luminous, so light emitting diode 235 will be in luminous state.
Therefore, via scan signal electrode 22 by row output scanning signal and cooperate the operation of data-signal electrode 21 outputting data signals, data-signal can be imported in each display unit, whether luminous via the light emitting diode in each display unit 235 again, thus determine the light and shade of each pixel or color and form a frame picture.
In the circuit of display driving of present embodiment, because the change of light emitting diode 235 positions, change to the source side of driving transistors by the drain side that is connected in driving transistors in the traditional circuit, the second, the 4th, the 5th transistor M21, M22, M23 are used to provide electric current, also has a voltage difference between the grid of aforementioned transistor M21, M22, M23 and the source electrode, if this voltage difference produces drift, then easily cause light emitting diode 235 to produce the electric current wild effect.Therefore, need between the grid of the second, the 4th, the 5th transistor M21, M22, M23 and source electrode, to be connected electric capacity 234, to avoid the unsettled phenomenon of light emitting diode 235 generation electric currents.Simultaneously, also because the negative pole of light emitting diode 235 is connected to a supply unit that negative potential Vss is provided, when even data-signal is logic low potential, the second, the grid of the 4th, the 5th transistor M21, M22, M23 and source electrode pressure reduction still can make described transistor turns, make light emitting diode 235 that undesired luminous phenomenon take place.Therefore, must and provide between the supply unit of the 3rd current potential Vref, connect the 3rd switch 233 (i.e. the 3rd transistor M3) by sweep signal control at the source electrode of the second, the 4th, the 5th transistor M21, M22, M23.The 3rd transistor M3 and transistor M1 conducting simultaneously can upwards be drawn the current potential of transistor M21, M22, M23 source electrode, avoids the undesired luminescence phenomenon of light emitting diode 235.
Comprehensively above-mentioned, the present invention utilizes amorphous silicon N transistor npn npn in parallel to provide light emitting diode required electric current, and the transistorized source electrode that provides drive current to use is provided light emitting diode, to be suitable for using fully the operating process of amorphous silicon transistor.Simultaneously, between the source of driving transistors, grid, connect the electric capacity that a voltage stabilizing is used, and between its source electrode and the 3rd current potential Vref point, increase by a switch, avoid the unstable problem that can't turn-off with driving transistors of electric current that is caused because of the adjustment of light emitting diode position.
Though the present invention with a preferred embodiment openly as above; so it is not to be used to limit the present invention; the technician in any field; under the situation that does not break away from design of the present invention and scope; can change and change, so protection scope of the present invention is as the criterion when looking the scope that accompanying Claim defines.
Claims (13)
1. the driving circuit of a display comprises:
One data-signal electrode, outputting data signals;
The one scan signal electrode, the output scanning signal;
One electric capacity, it has first end and second end, has voltage difference between two ends;
One light emitting diode, it has an anodal and negative pole, and this negative pole is connected to first supply unit, and this first supply unit has first current potential (Vss);
One first switch, it has first end and second end, and this first end is connected to this data-signal electrode and receives this data-signal, and this second end is connected to first end of this electric capacity;
One second switch, it has first end and second end, and this first end is connected to the second source device, and this second source device has second current potential (VDD), and second end of this second switch is connected to the positive pole of this light emitting diode; And
One the 3rd switch, it has first end and second end, and this first end is connected to the 3rd supply unit, and the 3rd supply unit has the 3rd current potential (Vref), and second end of the 3rd switch is connected to second end of this electric capacity.
2. circuit of display driving as claimed in claim 1, wherein this first, second and third switch also has the 3rd end respectively, the 3rd end of this first and the 3rd switch is connected to this scan signal electrode and receives this sweep signal, and sweep signal is controlled the shutoff or the closure of this first and the 3rd switch thus, the 3rd end of this second switch is connected to first end of this electric capacity, and is controlled the shutoff or the closure of this second switch by this voltage difference that these electric capacity two ends are had.
3. circuit of display driving as claimed in claim 2, wherein when this sweep signal made this first and the 3rd switch closure, this data-signal was sent to this electric capacity via this first switch, and determines this voltage difference at these electric capacity two ends.
4. circuit of display driving as claimed in claim 1, wherein this first, second and third switch comprises first respectively, second and third transistor, this is first years old, second and third transistor has drain electrode respectively, source electrode and grid, this is first years old, second and third transistor drain promptly be equivalent to this first, first end of second and third switch, this is first years old, second and third transistorized source electrode promptly be equivalent to this first, second end of second and third switch, this is first years old, second and third transistorized grid promptly be equivalent to this first, the 3rd end of second and third switch.
5. circuit of display driving as claimed in claim 4, wherein this second switch also comprises the 4th transistor, the 4th transistor AND gate transistor seconds is parallel with one another, the 4th transistor also has drain electrode, source electrode and grid, this the second and the 4th transistorized grid is connected to first end of this electric capacity jointly, and this second and the 4th transistorized source electrode is connected to second end of this electric capacity jointly.
6. circuit of display driving as claimed in claim 4, wherein said transistor are amorphous silicon film transistor.
7. circuit of display driving as claimed in claim 1, wherein this light emitting diode is an Organic Light Emitting Diode.
8. circuit of display driving as claimed in claim 1, wherein this light emitting diode is a polymer LED.
9. circuit of display driving comprises:
One data-signal electrode, outputting data signals;
The one scan signal electrode, the output scanning signal;
One light emitting diode, it has positive pole and negative pole, and this negative pole is connected to first supply unit, and this first supply unit has first current potential (Vss);
The first transistor, it has drain electrode, source electrode and grid, and this drain electrode is connected to this data-signal electrode and receives this data-signal, and this grid is connected to this scan signal electrode and receives this sweep signal;
Transistor seconds, it has drain electrode, source electrode and grid, and this drain electrode is connected to the second source device, and this second source device has second current potential (VDD), the source electrode of this transistor seconds is connected to the positive pole of this light emitting diode, and the grid of this transistor seconds is connected to the source electrode of this first transistor;
One electric capacity, it has first end and second end, and this first end is connected to the grid of this transistor seconds, and this second end is connected to the source electrode of this transistor seconds; And
The 3rd transistor, it has drain electrode, source electrode and grid, this drain electrode is connected to the 3rd supply unit, the 3rd supply unit has the 3rd current potential (Vref), the 3rd transistorized source electrode is connected to the source electrode of this transistor seconds, and the 3rd transistorized grid is connected to the grid of this first transistor.
10. circuit of display driving as claimed in claim 9, wherein also comprise the 4th transistor, this transistor seconds parallel connection of the 4th transistor AND gate, the 4th transistor has drain electrode, source electrode and grid, this drain electrode has this second current potential, this source electrode is connected to the positive pole of this light emitting diode, and this grid is connected to the source electrode of this first transistor.
11. circuit of display driving as claimed in claim 9, wherein said transistor are amorphous silicon film transistor.
12. circuit of display driving as claimed in claim 9, wherein this light emitting diode is an Organic Light Emitting Diode.
13. circuit of display driving as claimed in claim 9, wherein this light emitting diode is a polymer LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021052212A CN1262980C (en) | 2002-02-21 | 2002-02-21 | Driving circuit in display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021052212A CN1262980C (en) | 2002-02-21 | 2002-02-21 | Driving circuit in display screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1440014A true CN1440014A (en) | 2003-09-03 |
| CN1262980C CN1262980C (en) | 2006-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021052212A Expired - Lifetime CN1262980C (en) | 2002-02-21 | 2002-02-21 | Driving circuit in display screen |
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| Country | Link |
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| CN (1) | CN1262980C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401358C (en) * | 2004-02-23 | 2008-07-09 | 宏齐科技股份有限公司 | Circuit and method for driving LED panel display |
| CN101136168B (en) * | 2006-08-31 | 2010-12-01 | 奇美电子股份有限公司 | System used for displaying image and organic light-emitting component driving method |
| CN102054436A (en) * | 2010-12-28 | 2011-05-11 | 友达光电股份有限公司 | Pixel circuit of active matrix organic light emitting diode display |
| CN102262855A (en) * | 2011-08-04 | 2011-11-30 | 南京中电熊猫液晶显示科技有限公司 | Active driving OLED (Organic Light Emitting Diode) device |
| CN102915700A (en) * | 2011-08-04 | 2013-02-06 | 昆山维信诺显示技术有限公司 | Active OLED (organic light emitting diode) lighting device |
| CN103000122A (en) * | 2011-09-13 | 2013-03-27 | 昆山维信诺显示技术有限公司 | Active OLED (organic light emitting diode) lighting device |
-
2002
- 2002-02-21 CN CNB021052212A patent/CN1262980C/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401358C (en) * | 2004-02-23 | 2008-07-09 | 宏齐科技股份有限公司 | Circuit and method for driving LED panel display |
| CN101136168B (en) * | 2006-08-31 | 2010-12-01 | 奇美电子股份有限公司 | System used for displaying image and organic light-emitting component driving method |
| CN102054436A (en) * | 2010-12-28 | 2011-05-11 | 友达光电股份有限公司 | Pixel circuit of active matrix organic light emitting diode display |
| CN102262855A (en) * | 2011-08-04 | 2011-11-30 | 南京中电熊猫液晶显示科技有限公司 | Active driving OLED (Organic Light Emitting Diode) device |
| CN102915700A (en) * | 2011-08-04 | 2013-02-06 | 昆山维信诺显示技术有限公司 | Active OLED (organic light emitting diode) lighting device |
| CN102262855B (en) * | 2011-08-04 | 2014-03-12 | 南京中电熊猫液晶显示科技有限公司 | Active driving OLED (Organic Light Emitting Diode) device |
| CN102915700B (en) * | 2011-08-04 | 2015-11-25 | 昆山维信诺显示技术有限公司 | Active oled lighting device |
| CN103000122A (en) * | 2011-09-13 | 2013-03-27 | 昆山维信诺显示技术有限公司 | Active OLED (organic light emitting diode) lighting device |
| CN103000122B (en) * | 2011-09-13 | 2015-07-22 | 昆山维信诺显示技术有限公司 | Active OLED (organic light emitting diode) lighting device |
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| Publication number | Publication date |
|---|---|
| CN1262980C (en) | 2006-07-05 |
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Granted publication date: 20060705 |