CN1407525A - Organic LED driving circuit and method - Google Patents
Organic LED driving circuit and method Download PDFInfo
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- CN1407525A CN1407525A CN01131051A CN01131051A CN1407525A CN 1407525 A CN1407525 A CN 1407525A CN 01131051 A CN01131051 A CN 01131051A CN 01131051 A CN01131051 A CN 01131051A CN 1407525 A CN1407525 A CN 1407525A
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Abstract
A method and circuit for driving organic light emitting diodes is used for a LED matrix. The voltages are applied to the column and the row where the diode located is selected to emit when the difference of the applied voltages is higher than the breakover voltage of diodes which applying voltages to the rest columns and rows as reverse bias.
Description
Technical field
The invention relates to a kind of light emitting diode, particularly relevant for a kind of Organic Light Emitting Diode, and particularly about the driving method and the driving circuit of this kind Organic Light Emitting Diode.
Background technology
For meeting the variation trend of information equipment, flat-panel screens (Flat Panel Display, FPD) demand is urgent day by day, and move towards under the trend of compact and power saving in current world market, (cathode ray tube, CRT) the formula display is replaced by flat-panel screens cathode-ray tube (CRT) gradually.The technology that is applied in FPD now mainly contains following several: plasma display (plasma display), LCD (liquid crystal display), electroluminescent display (electroluminescent display), light emitting diode (lightemitting diode, LED), vacuum fluorescent display (vacuum fluorescent display), field-emitter display (field emission display), electrochromics display (electrochromic display) and organic light emitting diode display (organic LEDdisplay) etc.
The kind of organic light emitting diode display according to the luminescent material that is adopted, can be divided into two kinds: one is the micromolecule type, and another is a polymer electrolyte.Because Organic Light Emitting Diode (organic light emitting diodes, OLED) possesses following characteristic: the restriction at (1) no visual angle, (2) low manufacturing cost, (3) high reaction velocity (being more than hundred times of liquid crystal), (4) power saving, (5) can be used in the direct drive of portable machine, and (6) spendable temperature range is big, (7) in light weight and can meet the characteristic requirement of multimedia era display with hardware device miniaturization and slimming etc.Therefore, organic electroluminescence assembly in the system of flat-panel screens, has great development potentiality, is expected to become next novel flat-panel screens from generation to generation.
Yet the type of drive of this kind Organic Light Emitting Diode is unfixing.Generally speaking Organic Light Emitting Diode can forward voltage be about 2.4V.So in an organic LED array, that diode that normally will be luminous imposes forward bias voltage drop, for example applies 6V and applies 0V at negative pole at positive pole, makes this organic diode conducting, and then luminous.Then impose reverse bias as for contiguous with other non-luminous organic diode, it is closed.Generally speaking, be to be floated (floating) in the pin position of remaining Organic Light Emitting Diode in the array or connect a unknown current potential, making not, the shinny Organic Light Emitting Diode of desire is a closed condition.Perhaps existing LCD chip for driving is brought direct driving OLED.Yet because structural difference, these modes tend to go wrong.
Because type of drive uncertain and incorrect, tend to cause should not be bright led lighting, make that oled panel can't driven, the while improperly type of drive also can cause electric power excessively to consume.
Summary of the invention
Therefore, the present invention proposes a kind of driving circuit and method of Organic Light Emitting Diode, and it comes driving OLED panel correctly in simple mode, makes this bright Organic Light Emitting Diode can be luminous, and unit that should not be bright can be correct close, can be wrong driving produce.
The present invention proposes a kind of driving circuit and method of Organic Light Emitting Diode, and it is driving OLED effectively, and can save the consumption of electric power.
The present invention proposes a kind of driving circuit and method of Organic Light Emitting Diode, and it is used to have the array of several Organic Light Emitting Diodes, and those Organic Light Emitting Diodes are arranged in ordered series of numbers and number row.At first, need to select luminous one of them Organic Light Emitting Diode institute's respective column and row.Then, apply first voltage, and apply second voltage and be listed as, make the forward voltage of the pressure reduction of first voltage and second voltage, make its selected diode current flow luminous greater than Organic Light Emitting Diode in this in this row.Simultaneously, aforementioned first voltage is put on all the other each row that are not connected to selecteed Organic Light Emitting Diode, and second voltage is put on all the other each row that do not connect selecteed Organic Light Emitting Diode.
The present invention more proposes a kind of driving method of Organic Light Emitting Diode, is used to have the array of several Organic Light Emitting Diodes, and those Organic Light Emitting Diodes are arranged in ordered series of numbers and number row.At first, need to select luminous one of them Organic Light Emitting Diode institute's respective column and row.Then, apply first voltage, and apply second voltage and be listed as, make the forward voltage of the pressure reduction of first voltage and second voltage, make selected diode current flow luminous greater than Organic Light Emitting Diode in this in this row.Simultaneously, apply tertiary voltage, and apply the 4th voltage all the other each row, in order to provide a reverse bias to non-selected institute Organic Light Emitting Diode in the Organic Light Emitting Diode that does not connect quilt in all the other each row that do not connect selecteed Organic Light Emitting Diode.
Wherein the pressure reduction of this first voltage and this second voltage is not less than this forward voltage, and the pressure reduction of this first voltage and this tertiary voltage is not more than this forward voltage, and the pressure reduction of the 4th voltage and this tertiary voltage is not more than this forward voltage.
The present invention more provides a kind of driving circuit of Organic Light Emitting Diode, comprising: a plurality of Organic Light Emitting Diodes are arranged in an organic LED array with multiple row and multirow; A plurality of first voltage selectors are couple to each row of organic LED array respectively, and each first voltage selector receives first voltage and second voltage, and select one from first voltage and second voltage respectively and be supplied to each capable, and wherein first voltage is greater than second voltage; And a plurality of second voltage selectors, be couple to each row of organic LED array respectively, each second voltage selector receives tertiary voltage and the 4th voltage, and selects one from tertiary voltage and the 4th voltage respectively and be supplied to respectively and be listed as, and wherein tertiary voltage is greater than the 4th voltage.Wherein, the pressure reduction of above-mentioned first voltage and second voltage is not less than the forward voltage of each Organic Light Emitting Diode, the pressure reduction of first voltage and tertiary voltage is not more than forward voltage, and the pressure reduction that the pressure reduction of the 4th voltage and second voltage is not more than forward voltage and the 4th voltage and tertiary voltage is not more than forward voltage.
Adopt the present invention, the both end voltage of having only the Organic Light Emitting Diode of wanting luminous is greater than forward voltage, and the both end voltage of all the other Organic Light Emitting Diodes is less than forward voltage, and in order to guaranteeing having only this luminous led lighting, and contiguous diode can be not disturbed and mistake acts on luminous.
Description of drawings
Fig. 1 is circuit and the operation chart according to first embodiment of the driving circuit of Organic Light Emitting Diode of the present invention and method
Fig. 2 is circuit and the operation chart according to second embodiment of the driving circuit of Organic Light Emitting Diode of the present invention and method
Fig. 3 is the circuit diagram according to the 3rd embodiment of the driving circuit of Organic Light Emitting Diode of the present invention and method
10,20,30: organic LED array
12,22,32: the diode of desiring to light
Embodiment
The present invention mainly proposes several circuit that drives Organic Light Emitting Diode effectively and methods, and it can avoid the adjacent diodes of the diode desiring to light can be overdue not bright, also can reach purpose of power saving simultaneously.For this reason, below provide several embodiment of the present invention.
First embodiment
Fig. 1 is circuit and the operation chart according to first embodiment of the driving circuit of Organic Light Emitting Diode of the present invention and method.Be an organic LED array 10 among the figure, this array is constituted by lining up several Organic Light Emitting Diodes of ordered series of numbers with the number row.Generally speaking, just can allow led lighting as long as apply forward bias voltage drop (forward bias) at the two ends of Organic Light Emitting Diode greater than forward voltage.
As shown in the figure, suppose that the luminous diode of desire 12 indicates for the dotted line among the figure, at first, need to select luminous wherein 12 respective column of an Organic Light Emitting Diode and row.Then, apply the first voltage V1, and apply the second voltage V2 and be listed as, make the forward voltage of the pressure reduction of the first voltage V1 and the second voltage V2 greater than Organic Light Emitting Diode in this in this row.So, just conducting is luminous for Organic Light Emitting Diode 12.Simultaneously, the aforesaid first voltage V1 is put on all the other each row that are not connected with OLED 12, and the second voltage V2 is put on all the other each row that are not connected with OLED 12.
The forward voltage of general Organic Light Emitting Diode is about 2.4V, so in order to allow the diode selected driven for emitting lights correctly, and the diode around not influencing, for example the first voltage V1 can be 6V, and the second voltage V2 can be 0V.This moment, the forward bias voltage drop at diode 12 two ends was 6V just, was enough to allow diode 12 conductings luminous.The voltage of this 6V also is applied to all the other each row that are not connected with OLED 12 simultaneously, and the voltage of 0V then puts on all the other each row that are not connected with OLED 12.So except diode 12, the two ends of all the other diodes all apply the reverse bias of a 6V, so can guarantee that all the other diodes can be not luminous.
The present invention utilizes the first voltage V1 (as 6V) is applied to the negative pole of non-luminous all diodes, and the second voltage V2 (as 0V) is applied to the positive pole of non-luminous all diodes.Therefore, except the luminous diode of desire, remaining diode two ends all is applied in a high reverse bias.So the mistake driving problems that can not produce as commonsense method occurs.
Second embodiment
In order to make the driving Organic Light Emitting Diode more save electric power, the present invention more proposes second kind of type of drive.Fig. 2 is circuit and the operation chart according to second embodiment of the driving circuit of Organic Light Emitting Diode of the present invention and method.Be an organic LED array 20 among the figure, this array is constituted by lining up several Organic Light Emitting Diodes of ordered series of numbers with the number row.
As shown in the figure, suppose that the luminous diode of desire 22 indicates for the dotted line among the figure, at first, need to select luminous wherein 22 respective column of an Organic Light Emitting Diode and row.Then, apply the first voltage V1, and apply the second voltage V2 and be listed as, make the forward voltage of the pressure reduction of the first voltage V1 and the second voltage V2 greater than Organic Light Emitting Diode in this in this row.So, just conducting is luminous for Organic Light Emitting Diode 22.Simultaneously, tertiary voltage V3 is put on all the other each row that are not connected with OLED 22, and the 4th voltage V4 is put on all the other each row that are not connected with OLED 22.
As described in first embodiment, in order to allow the diode selected driven for emitting lights correctly, and the diode around not influencing, for example the first voltage V1 can be 6V, and the second voltage V2 can be 0V, and tertiary voltage is that 4V and the 4th voltage are 2V.This moment, the forward bias voltage drop at diode 22 two ends was 6V just, be enough to allow diode 12 conductings luminous, and remaining diode two ends was reverse bias 2V, can restrain all the other led lightings.
In this embodiment, it is identical with first embodiment to drive the mode of the diode 22 desire to light.Positive pole (as being connected to row) for other non-luminous diode all applies 2V, and negative pole (as being connected to row) all applies 4V.So all do not desire the reverse bias that light emitting diode all applies 2V.Therefore, except the luminous diode of desire, remaining diode two ends all is applied in a high reverse bias.So the mistake driving problems that can not produce as commonsense method occurs.And the voltage that applies drops to 2V and 4V from 6V, more can save electric power.
The 3rd embodiment
Fig. 3 is the driving circuit according to Organic Light Emitting Diode of the present invention.This circuit framework is the circuit structure that is used for implementing above-mentioned two embodiment.Only provided necessary circuit member in this circuit diagram, the member that does not provide belongs to ordinary skill, can't influence enforcement.
Comprise several Organic Light Emitting Diodes in the circuit, it is arranged in an organic LED array 30 with multiple row and multirow; Several first voltage selectors S1 is couple to each row of organic LED array 30 respectively, and each first voltage selector S1 receives the first voltage V
DHWith the second voltage V
DL, and respectively from the first voltage V
DHWith the second voltage V
DLSelect one and be supplied to each row, wherein first voltage V
DHGreater than the second voltage V
DLAnd several second voltage selectors S2, being couple to respectively being listed as of organic LED array 30 respectively, each second voltage selector S2 receives tertiary voltage V
SHWith the 4th voltage V
SL, and respectively from tertiary voltage V
SHWith the 4th voltage V
SLSelect one and be supplied to each row, wherein tertiary voltage V
SHGreater than the 4th voltage V
SL
Wherein first to the 4th voltage satisfies following relationship:
V
dH-V
sL≥V
F；V
dH-V
sH≤V
F
V
dL-V
sL≤V
F；V
dL-V
sH≤V
F
For instance, at the example of above-mentioned second embodiment, V
DH=6V, V
DL=2V, V
SL=0V, V
SH=4V.And each voltage can be adjusted to V in above-mentioned first embodiment
DH=6V, V
DL=0V, V
SL=0V, V
SH=6V.So just can reach the operation of first and second embodiment.
With second embodiment, when selected organic diode 32 was conducting, the first voltage selector S1 that its corresponding row connected selected the first voltage V
DHGive the positive pole of this diode 32, and the first voltage selector S1 that remaining row connected selects selection the 4th voltage V
DLOutput; The second voltage selector S2 that its respective column connected selects the second voltage V
SLGive the negative pole of this diode 32, and the second voltage selector S2 that all the other row are connected selects selection tertiary voltage V
SHOutput.
So, the diode of desire conducting just applies V
DH-V
SLForward bias voltage drop, the diode of not lighting then all applies V
SH-V
DLReverse bias.So it is luminous correctly to drive desired diode current flow, and can not drive contiguous diode by mistake.
In sum, OLED driver circuit of the present invention and method with have following advantage and effect under ordinary skill is compared at least:
Driving circuit and method according to Organic Light Emitting Diode of the present invention, it comes correct driving organic LED panel in simple mode, make the Organic Light Emitting Diode of desiring to light can be luminous, and it is abnormal luminous can not influence contiguous diode, the diode of desiring to light can be correct conducting, can be wrong driving produce.
The present invention proposes a kind of driving circuit and method of Organic Light Emitting Diode, can drive Organic Light Emitting Diode effectively, and the consumption that can save electric power.
Claims (13)
1, a kind of Organic Light Emitting Diode driving method is used to have the array of a plurality of Organic Light Emitting Diodes, and those Organic Light Emitting Diodes are arranged in multiple row and multirow, it is characterized in that,
Select one of them pairing row and delegation of those Organic Light Emitting Diodes;
Apply one first voltage in this row, and apply one second voltage and be listed as, make the forward voltage of the pressure reduction of this first voltage and this second voltage, make its conducting greater than this Organic Light Emitting Diode of this selection in this; And
Apply this first voltage all the other row simultaneously, and apply this second voltage in the remaining row of this Organic Light Emitting Diode that does not connect this selection in this Organic Light Emitting Diode that does not connect this selection.
2, Organic Light Emitting Diode driving method as claimed in claim 1 is characterized in that, this forward voltage is 2.4 volts.
3, Organic Light Emitting Diode driving method as claimed in claim 2 is characterized in that, the pressure reduction of this first voltage and this second voltage is 6 volts.
4, Organic Light Emitting Diode driving method as claimed in claim 1 is characterized in that, this first voltage is 6 volts, and this second voltage is 0 volt.
5, a kind of driving method of Organic Light Emitting Diode is used to have the array of a plurality of Organic Light Emitting Diodes, and those Organic Light Emitting Diodes are arranged in multiple row and multirow, it is characterized in that,
Select one of them pairing row and delegation of those Organic Light Emitting Diodes;
Apply one first voltage in this row, and apply one second voltage and be listed as, make the forward voltage of the pressure reduction of this first voltage and this second voltage, make its conducting greater than this Organic Light Emitting Diode of this selection in this; And
Apply a tertiary voltage all the other each row simultaneously in this Organic Light Emitting Diode that does not connect this selection, and apply one the 4th voltage all the other each row, in order to provide a reverse bias to non-selected each Organic Light Emitting Diode in this Organic Light Emitting Diode that does not connect this selection.
6, Organic Light Emitting Diode driving method as claimed in claim 5 is characterized in that, the 3rd with the pressure reduction of the 4th voltage less than this forward voltage.
7, Organic Light Emitting Diode driving method as claimed in claim 5 is characterized in that, this forward voltage is 2.4 volts.
8, Organic Light Emitting Diode driving method as claimed in claim 7 is characterized in that, the pressure reduction of this first voltage and this second voltage is 6 volts.
9, Organic Light Emitting Diode driving method as claimed in claim 8 is characterized in that, the pressure reduction of this tertiary voltage and the 4th voltage is 2 volts.
10, Organic Light Emitting Diode driving method as claimed in claim 5 is characterized in that, this first voltage is 6 volts, and this second voltage is 0 volt.
11, Organic Light Emitting Diode driving method as claimed in claim 10 is characterized in that, this tertiary voltage is 4 volts, and the 4th voltage is 2 volts.
12, Organic Light Emitting Diode driving method as claimed in claim 5, it is characterized in that, the pressure reduction of this first voltage and this second voltage is not less than this forward voltage, the pressure reduction of this first voltage and this tertiary voltage is not more than this forward voltage, and the pressure reduction that the pressure reduction of the 4th voltage and this second voltage is not more than this forward voltage and the 4th voltage and this tertiary voltage is not more than this forward voltage.
13, a kind of driving circuit of Organic Light Emitting Diode comprises:
A plurality of Organic Light Emitting Diodes are arranged in an organic LED array with multiple row and multirow; It is characterized in that this circuit also comprises:
A plurality of first voltage selectors, be couple to each row of this organic LED array respectively, respectively this first voltage selector receives one first voltage and one second voltage, and selects one from this first voltage and this second voltage respectively and be supplied to each row, and wherein this first voltage is greater than this second voltage; And
A plurality of second voltage selectors, be couple to each row of this organic LED array respectively, respectively this second voltage selector receives a tertiary voltage and one the 4th voltage, and select one from this tertiary voltage and the 4th voltage respectively and be supplied to each row, wherein this tertiary voltage is greater than the 4th voltage, wherein the pressure reduction of this first voltage and this second voltage is not less than a forward voltage of each those Organic Light Emitting Diode, the pressure reduction of this first voltage and this tertiary voltage is not more than this forward voltage, the pressure reduction of the 4th voltage and this second voltage is not more than this forward voltage, and the pressure reduction of the 4th voltage and this tertiary voltage is not more than this forward voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01131051A CN1407525A (en) | 2001-09-10 | 2001-09-10 | Organic LED driving circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01131051A CN1407525A (en) | 2001-09-10 | 2001-09-10 | Organic LED driving circuit and method |
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|---|---|
| CN1407525A true CN1407525A (en) | 2003-04-02 |
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Family Applications (1)
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|---|---|---|---|
| CN01131051A Pending CN1407525A (en) | 2001-09-10 | 2001-09-10 | Organic LED driving circuit and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371975C (en) * | 2003-06-25 | 2008-02-27 | 盛群半导体股份有限公司 | Driving method of light-emitting diode |
| CN100410981C (en) * | 2005-03-07 | 2008-08-13 | 盛群半导体股份有限公司 | High-efficient electric-saving LED driving method |
| CN101702301B (en) * | 2003-06-18 | 2012-12-12 | 株式会社半导体能源研究所 | Display device and driving method of the same |
| US8717269B2 (en) | 2004-12-06 | 2014-05-06 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
-
2001
- 2001-09-10 CN CN01131051A patent/CN1407525A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702301B (en) * | 2003-06-18 | 2012-12-12 | 株式会社半导体能源研究所 | Display device and driving method of the same |
| CN100371975C (en) * | 2003-06-25 | 2008-02-27 | 盛群半导体股份有限公司 | Driving method of light-emitting diode |
| US8717269B2 (en) | 2004-12-06 | 2014-05-06 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
| CN102496346B (en) * | 2004-12-06 | 2015-05-13 | 株式会社半导体能源研究所 | Display device |
| US9123625B2 (en) | 2004-12-06 | 2015-09-01 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
| CN100410981C (en) * | 2005-03-07 | 2008-08-13 | 盛群半导体股份有限公司 | High-efficient electric-saving LED driving method |
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