CN1622705A - Self-luminescence circuit with power-saving function and method thereof - Google Patents
Self-luminescence circuit with power-saving function and method thereof Download PDFInfo
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- CN1622705A CN1622705A CN200410101979.8A CN200410101979A CN1622705A CN 1622705 A CN1622705 A CN 1622705A CN 200410101979 A CN200410101979 A CN 200410101979A CN 1622705 A CN1622705 A CN 1622705A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The present invention provides one kind of light emitting circuit and method with power saving function. The light emitting circuit has one reactive element connected electrically to the power supply and drive circuit to regulate the overall power consumption automatically based on the total current the pixel units consume. Therefore, the present invention can reduce power consumption and fluctuation without affecting display quality.
Description
Technical field
The present invention is about a kind of self-luminescence circuit and method of tool electricity-saving function, particularly about a kind of Organic Light Emitting Diode circuit of tool electricity-saving function.
Background technology
Advantages such as self-luminosity (emissive) display is frivolous because of having, color saturation is high, active illuminating, video picture speed fast, power saving, being regarded as marching toward, next replaces one of plane Display Technique of LCD from generation to generation.Organic electro-luminescent display (Organic Electro-luminescence Display, OELD) be one of the major technique of self-luminosity display, be called Organic Light Emitting Diode (Organic Light EmittingDiode again, OLED) display floater, this kind technology have had LCD (LCD) and both advantages of diode (LED) concurrently.
Fig. 1 shows the circuit diagram of a pixel cell of organic light emitting diode display.In each pixel cell 100, behind the grid G of the P type thin-film transistor 101 input data input signal Vdata, the size of gate-to-source current potential (Vgs) the Control current Id of its formation is so as to driving the luminous of Organic Light Emitting Diode 102.
Because the consumes power of self-luminosity display is proportional with its luminosity and light-emitting area, so get over for a long time in bright zone in the shown picture of display, current sinking is also just high more; When all being dark when regional in the picture, at this time current sinking is almost nil, and the power consumption of this self-luminosity display with regard to why has the reason of so big fluctuation.For instance, with the previous 2 inches organic light emitting diode display of order, the power fluctuation from complete dark picture to complete bright picture is 0mW to 1200mW.Because display system when design, need be considered the electrical source consumption situation of maximum possible,, not only can cause the difficulty in the system design again, more can reduce the useful life of element for traditional organic light emitting diode display big power fluctuation like this.Therefore demand proposing a kind of self-luminosity display urgently, it can reduce the fluctuation of consumed power, and can reduce whole consumes power whereby.
Summary of the invention
In above-mentioned prior art, many shortcomings of traditional monitor, one of purpose of the present invention provides a kind of self-luminescence circuit and method, and it can adjust the brightness of display floater from light-emitting area and brightness movingly.
Another object of the present invention is for providing a kind of self-luminescence circuit and method, in order to saving the consumption of power supply, and can not influence the display quality of display.
A further object of the present invention is for providing a kind of self-luminescence circuit and method, and the fluctuation that it can substantial minimizing consumed power is beneficial to the design of integral display system.
A kind of self-luminescence circuit is provided according to an aspect of the present invention, has a power source supply end, comprising: a plurality of driving elements, each those driving element have one source pole, a drain electrode and a grid; A plurality of self-emission devices, each those self-emission device is electrically connected at this drain electrode; And an impedance component, electrically connect this source electrode and this power source supply end respectively, regulating the potential difference of this grid and this source electrode, and regulate the brightness of this self-emission device simultaneously.
A kind of self-luminescence circuit is provided according to a further aspect of the invention, has a power source supply end, and one first current potential is provided, comprising: at least one driving element has a grid, one source pole and a drain electrode; One impedance component electrically connects this source electrode and this power source supply end respectively, and forms one second current potential in this source electrode; And at least one self-emission device, be electrically connected at this drain electrode, and the brightness of this self-emission device is to decide according to the potential difference of this source electrode and this grid; Wherein, the current potential of this impedor total current and this drain electrode is inversely proportional to.
A kind of electrical source consumption control method of self-emitting display is provided according to a further aspect of the present invention, comprises: a power supply is provided; Electrically connect a plurality of driving elements and this power supply, wherein each those driving element has a grid, one source pole and a drain electrode; According to this grid and this source potential, drive a plurality of self-emission devices, wherein each those self-emission device and this drain electrode electrically connect; Luminous according to these a plurality of self-emission devices, a total current is provided; And, adjust impedor two terminal potentials according to this total current, wherein this impedance component electrically connects with this source electrode and this power supply respectively.
The self-luminescence circuit of a kind of tool electricity-saving function provided by the present invention and method, it has an impedance component, is electrically connected at power source supply end and drive circuit, according to the total electricity that pixel cell consumed, to regulate the supply current potential of pixel cell.In the present invention wherein among the embodiment, this impedance component comprises a resistive element, when total electricity that pixel cell consumed increased, the potential drop that this resistive element produced will reduce the supply current potential of pixel cell, made the flow through electric current of pixel cell decrease.Because people's eyes can't obviously be discovered out for the luminosity that this limited potential drop reduced, therefore can not have influence on the display quality of display.By the present invention, fluctuation that can substantial minimizing consumed power, and the consumption of saving power supply.
Description of drawings
Fig. 1 is the circuit diagram that shows a pixel cell of traditional organic light emitting diode display;
Fig. 2 is one the self-luminescence circuit schematic diagram that shows the embodiment of the invention; And
Fig. 3 is the self-luminescence circuit schematic diagram that shows another embodiment of the present invention.
Embodiment
Next be detailed description of the present invention, in the following explanation description of the self-luminosity display of tool electricity-saving function do not comprised the complete description of detailed flow process and operation principles.The prior art that the present invention continued to use is only done quoting of emphasis formula at this, to help elaboration of the present invention.And relevant accompanying drawing also draws according to actual ratio, and its effect is only giving expression to characteristics of the present invention.
The shown circuit diagram of Fig. 2 is the embodiment of the self-luminescence circuit of tool electricity-saving function of the present invention.For convenience of description, only show three pixel cells 201,202 and 203 explaining, yet how those skilled in the art are combined into a complete display picture with most pixel cells when knowing at this.The present invention includes a plurality of pixel cells 201,202 and 203, and impedance component 204.And each pixel cell 201,202,203 has separately self-luminosity element connected in series in drive circuit.In the present embodiment, the self-luminosity element is to use Organic Light Emitting Diode, drive circuit then can be three-terminal element as: P type thin-film transistors comprises grid, source electrode and drain electrode, and it also can be low temperature polycrystalline silicon (LTPS), amorphous silicon (a-Si) or organic (Organic) thin-film transistors.In pixel cell, the negative electrode of Organic Light Emitting Diode is connected in power supply Vss, and anode is received the drain D that drives P type thin-film transistors, and the grid G that drives P type thin-film transistors then receives data input signal Vdata, and source S is connected to impedance component 204.Impedance component 204 is series between supply power Vdd and the pixel cell (201,202,203); This impedance component 204 can be single impedance component, perhaps the impedance component of forming for transistor.
Next be the explanation of circuit operation.In the present embodiment, the source S current potential of the driving P type thin-film transistors in each pixel cell 201,202 and 203 is respectively V1p, V2p and Vnp; The electric current of each pixel cell 201,202 and 203 of flowing through then is respectively I1p, I2p and Inp.By circuit structure as can be known, Ix is a total current, and it is equivalent to the summation of I1p, I2p and Inp.In addition, current potential between the gate-to-source of driving transistors | the size of Vgs| then determines the magnitude of current (I1p, I2p and Inp) of pixel cell.Get over for a long time when picture shows bright area, total current Ix is just big more; It causes the potential drop at impedance component 204 two ends also and then to increase.Therefore, make source S current potential V1p, the V2p of driving P type thin-film transistors of each pixel cell (201,202,203) and Vnp descend.The source potential of this decline is impelled current potential between gate-to-source | and Vgs| descends, and the electric current I 1p in the pixel cell, I2p and Inp are also along with minimizing; So just, form a negative feedback control loop.In other words, total current is directly proportional with the current potential of impedance component own, and is directly proportional with self-emission device brightness, more we can say, the impedor total current of flowing through and transistor drain current potential are inversely proportional to.By impedance component of the present invention, fluctuation that can substantial minimizing consumed power; And when large tracts of land display white bright area, display will reduce the output of brightness automatically to save the consumption of power supply.Because people's eyes can't obviously be discovered out for the luminosity that this limited potential drop reduced, therefore can't have influence on the display quality of display.
The shown circuit diagram of Fig. 3 is another embodiment of the self-luminescence circuit of tool electricity-saving function of the present invention.Similarly, for convenience of description, only show three pixel cells 301,302 and 303 as an illustration at this, yet, be familiar with this operator when knowing how a majority pixel cell is combined into a complete display picture.The present invention includes a plurality of pixel cells 301,302 and 303, and impedance component 304.Each pixel cell 301,302,303 has self-luminosity element and drive circuit separately.In the present embodiment, the self-luminosity element is to use Organic Light Emitting Diode to be series at drive circuit, and drive circuit then comprises N type thin-film transistors.More different with last embodiment (Fig. 2) is, the anode of Organic Light Emitting Diode is to be connected in power supply Vdd, negative electrode then is connected in the drain D of driving N type thin-film transistors, and the grid G that drives P type thin-film transistors receives data input signal Vdata, and source electrode then is connected to impedance component 304.Identical with last embodiment, impedance component 304 can be single impedance component, also can be the resistive element that transistor is formed; And impedance component 304 is to be connected between power supply Vss and the pixel cell.
Circuit operation principle and the last embodiment of this embodiment are similar.In the present embodiment, the source S current potential of the driving N type thin-film transistors in each pixel cell 301,302 and 303 is respectively V1n, V2n and Vnn; The electric current of each pixel cell 301,302 and 303 of flowing through then is respectively I1n, I2n and Inn.By circuit structure as can be known, Iy is a total current, and it is equivalent to the summation of I1n, I2n and Inn.In addition, current potential between the gate-to-source of driving transistors | the size of Vgs| then determines the magnitude of current (I1n, I2n and Inn) of pixel cell.Get over for a long time when picture shows bright area, total current Iy is just big more; It causes the potential drop at impedance component 304 two ends also and then to increase.Therefore, make source S current potential V1n, the V2n of driving N type thin-film transistors of each pixel cell (301,302,303) and Vnn descend.The source potential of this decline is impelled current potential between gate-to-source | and Vgs| descends, and the electric current I 1n in the pixel cell, I2n and Inn are also along with minimizing; So just, form a negative feedback control loop.By impedance component of the present invention, fluctuation that can substantial minimizing consumed power; And when large tracts of land display white bright area, display will reduce the output of brightness automatically to save the consumption of power supply.Because people's eyes can't obviously be discovered out for the luminosity that this limited potential drop reduced, therefore can't have influence on the display quality of display.
In the above-described embodiment, impedance component is between the voltage stabilizing output point of the source terminal of pixel cell and power circuit.Impedance component can be made on the glass substrate simultaneously with pixel cell, also can be made in the external module of glass substrate separately.The visual customer demand of impedance component is had made to order, beats up between the nurse to 25 and its best impedance ranges is approximately 1 ohm.Other what deserves to be explained is, according to transistorized grid-source potential | the Vgs| characteristic is controlled the brightness of Organic Light Emitting Diode, want Billy to use leakage-source potential | the ideal that Vds| comes, because when transistor operates in the saturation region, transistorized electric current I d is subjected to grid-source potential | Vgs| controls.
Therefore for more particularly bright implementation result of the present invention, will illustrate that respectively (one) does not use impedor traditional monitor with first embodiment (Fig. 2) under, and (two) use impedor display of the present invention.
(1) when not using impedance component:
When picture was complete dark: Vdd was set at 3V, Vg=Vdata=3V, and total current Ix=0mA, but because R=0, thus (Ix) R=0V, thus Vs=Vdd-(Ix) R=3V-0V=3V, Vgs=0V, last total current is 0mA.
When picture complete when bright: Vdd is set at 3V, Vg=Vdata=0V, total current Ix=100mA, but because R=0, thus (Ix) R=0V, so Vs=Vdd-IR=3V-0V=3V, Vgs=3V, last total current is 100mA.
When (two) use impedance component, and impedance is 5 ohm:
When picture was complete dark: Vdd was set at 3V, Vg=Vdata=3V, and total current Ix=0mA, but because R=0, thus (Ix) R=0V, thus Vs=Vdd-IR=3V-0=3V, Vgs=0V, last total current is 0mA.
When picture complete when bright: Vdd is set at 3V, Vg=Vdata=0V, total current Ix=100mA, but because R=5, thus (Ix) R=0.5V, so Vs=Vdd-(Ix) R=3V-0.5=2.5V, Vgs=-2.5V, last total current is 80mA.
According to above-mentioned data, when not using impedance component, the last total current of complete bright picture is 100mA, and its brightness is approximately 150nits; When using impedance component, the last total current of complete bright picture is 80mA, and its brightness is approximately 120nits.That is the total electricity of complete bright picture has been saved 20mA.Because human eye is that 150nits or 120nits differentiate not too for the picture of large tracts of land brightness, therefore, the display quality of display can't be affected.By the present invention, fluctuation that can substantial minimizing consumed power, and the consumption of saving power supply.
The above is preferred embodiment of the present invention only, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should be included in following the application's the claim scope.
Claims (23)
1. a self-luminescence circuit has a power source supply end, comprising:
A plurality of driving elements, each those driving element have one source pole, a drain electrode and a grid;
A plurality of self-emission devices, each those self-emission device is electrically connected at this drain electrode; And
One impedance component electrically connects this source electrode and this power source supply end respectively, regulating the potential difference of this grid and this source electrode, and regulates the brightness of this self-emission device simultaneously.
2. self-luminescence circuit as claimed in claim 1 is characterized in that this self-emission device includes OLED.
3. self-luminescence circuit as claimed in claim 1 is characterized in that, each those self-emission device has an anode, and this anode electrically connects this drain electrode.
4. self-luminescence circuit as claimed in claim 1 is characterized in that, each those driving element is a P type thin-film transistor or N type thin-film transistor.
5. self-luminescence circuit as claimed in claim 1 is characterized in that, each those driving element is to connect with each those self-emission device.
6. self-luminescence circuit as claimed in claim 1 is characterized in that, this impedor electric current equals the total electricity that those self-emission devices consume.
7. self-luminescence circuit as claimed in claim 6 is characterized in that, when this impedor electric current increases, then reduces the supply current potential of this self-emission device, makes the electric current of this self-emission device reduce, to reach the function of power saving.
8. self-luminescence circuit as claimed in claim 1 is characterized in that this impedance component comprises a resistive element.
9. self-luminescence circuit as claimed in claim 7 is characterized in that, the resistance value of this resistive element is 1 ohm to 25 ohm.
10. self-luminescence circuit as claimed in claim 1 is characterized in that this impedance component comprises a transistor.
11. a self-luminescence circuit has a power source supply end, and one first current potential is provided, and comprising:
At least one driving element has a grid, one source pole and a drain electrode;
One impedance component electrically connects this source electrode and this power source supply end respectively, and forms one second current potential in this source electrode; And
At least one self-emission device is electrically connected at this drain electrode, and the brightness of this self-emission device is to decide according to the potential difference of this source electrode and this grid;
Wherein, the current potential of this impedor total current and this drain electrode is inversely proportional to.
12. self-luminescence circuit as claimed in claim 11 is characterized in that, this second current potential is deducted this impedor current potential that this impedor electric current caused of flowing through for this first current potential.
13. self-luminescence circuit as claimed in claim 11 is characterized in that, this self-emission device includes OLED.
14. self-luminescence circuit as claimed in claim 11 is characterized in that, this self-emission device has an anode, and this anode electrically connects this drain electrode.
15. self-luminescence circuit as claimed in claim 11 is characterized in that, this driving element is a P type thin-film transistor or N type thin-film transistor.
16. self-luminescence circuit as claimed in claim 11 is characterized in that, this driving element is to connect with this self-emission device.
17. self-luminescence circuit as claimed in claim 11 is characterized in that, this impedor electric current equals the total electricity that whole these self-emission devices are consumed.
18. self-luminescence circuit as claimed in claim 11 is characterized in that, this impedance component comprises a resistive element.
19. self-luminescence circuit as claimed in claim 11 is characterized in that, the resistance value of this resistive element is 1 ohm to 25 ohm.
20. self-luminescence circuit as claimed in claim 11 is characterized in that, this impedance component comprises a transistor.
21. the electrical source consumption control method of a self-emitting display comprises:
One power supply is provided;
Electrically connect a plurality of driving elements and this power supply, wherein each those driving element has a grid, one source pole and a drain electrode;
According to this grid and this source potential, drive a plurality of self-emission devices, wherein each those self-emission device and this drain electrode electrically connect;
Luminous according to these a plurality of self-emission devices, a total current is provided; And
According to this total current, adjust impedor two terminal potentials, wherein this impedance component electrically connects with this source electrode and this power supply respectively.
22. the electrical source consumption method of adjustment of self-emitting display as claimed in claim 23 is characterized in that, provides a total current step to comprise these a plurality of self-emission device brightness and is directly proportional with this total current size.
23. the electrical source consumption method of adjustment of self-emitting display as claimed in claim 23 is characterized in that, adjusts an impedor two ends potential step and comprises this total current size and be directly proportional with these impedor two terminal potentials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101019798A CN100459221C (en) | 2004-12-10 | 2004-12-10 | Self-luminescence circuit with power-saving function and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101019798A CN100459221C (en) | 2004-12-10 | 2004-12-10 | Self-luminescence circuit with power-saving function and method thereof |
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| CN1622705A true CN1622705A (en) | 2005-06-01 |
| CN100459221C CN100459221C (en) | 2009-02-04 |
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| CNB2004101019798A Active CN100459221C (en) | 2004-12-10 | 2004-12-10 | Self-luminescence circuit with power-saving function and method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174385B (en) * | 2006-11-02 | 2010-05-12 | 立锜科技股份有限公司 | Backlight control circuit and luminous element control method |
| CN101231815B (en) * | 2007-01-23 | 2010-09-22 | 立锜科技股份有限公司 | Energy saving control circuit of organic luminous panel and method thereof |
| CN102169671A (en) * | 2010-02-22 | 2011-08-31 | 松下电工株式会社 | Display device and guide lamp including same |
| CN104540295A (en) * | 2015-01-06 | 2015-04-22 | 中航华东光电有限公司 | OLED brightness adjusting system based on FPGA and digital potentiometer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100940342B1 (en) * | 2001-11-13 | 2010-02-04 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Display device and method for driving the same |
| CN1709013B (en) * | 2002-11-13 | 2010-12-01 | 松下电器产业株式会社 | Light emitting device |
-
2004
- 2004-12-10 CN CNB2004101019798A patent/CN100459221C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174385B (en) * | 2006-11-02 | 2010-05-12 | 立锜科技股份有限公司 | Backlight control circuit and luminous element control method |
| CN101231815B (en) * | 2007-01-23 | 2010-09-22 | 立锜科技股份有限公司 | Energy saving control circuit of organic luminous panel and method thereof |
| CN102169671A (en) * | 2010-02-22 | 2011-08-31 | 松下电工株式会社 | Display device and guide lamp including same |
| US8878441B2 (en) | 2010-02-22 | 2014-11-04 | Panasonic Corporation | Display device and guide lamp including same |
| CN104540295A (en) * | 2015-01-06 | 2015-04-22 | 中航华东光电有限公司 | OLED brightness adjusting system based on FPGA and digital potentiometer |
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| Publication number | Publication date |
|---|---|
| CN100459221C (en) | 2009-02-04 |
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