CN1139907C - Driving method and driving circuit for grey display of organic electroluminescent display device - Google Patents
Driving method and driving circuit for grey display of organic electroluminescent display device Download PDFInfo
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- CN1139907C CN1139907C CNB011363932A CN01136393A CN1139907C CN 1139907 C CN1139907 C CN 1139907C CN B011363932 A CNB011363932 A CN B011363932A CN 01136393 A CN01136393 A CN 01136393A CN 1139907 C CN1139907 C CN 1139907C
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Abstract
The present invention provides a driving method and a driving circuit for the grey scale display of an organic electroluminescent display device. 1 to 256 grades of grey scale, the constant current output and 1 to 32 bits of input can be achieved by a method of modulating pulse width, and the output can highly reach to 128 paths or more. Thereby, the image display and the colorizing of the organic electroluminescent display device can be preferably realized.
Description
Technical field
The present invention relates to organic electroluminescent Driving technique field, specifically, relate to a kind of driving method and driving circuit of organic elctroluminescent device, relate in particular to driving method and driving circuit that the organic elctroluminescent device gray scale shows.
Background technology
Organic elctroluminescent device (Organic Electroluminescent Display, hereinafter to be referred as OLED) be a kind of emerging flat-panel display device, its preparation technology is simple, cost is low, be easy to realize colored the demonstration and large screen display, because its driving DC voltage only needs several volts or tens volts, low in energy consumption, response speed is fast, can be complementary with the integrated circuit driving, and the luminosity height, the working temperature wide accommodation, volume is thin and light, therefore will be widely used on the various active displays.The display quality of OLED can be comparable with thin film transistor (TFT) (Thin-Film Transistor is hereinafter to be referred as TFT) active driven liquid crystal display spare (Liquid Crystal Display is hereinafter to be referred as LCD), and price is cheap more than it.
OLED has diode characteristic, on first electrode (anode) of OLED and second electrode (negative electrode), apply DC voltage, when voltage reaches a certain value (being commonly referred to threshold voltage), in organic luminous layer, meet, combine and generate exciton from the hole of anode with electronics, radiation recombination takes place and cause luminous from negative electrode.Wherein first electrode is transparent tin indium oxide (Indium Tin Oxide, hereinafter to be referred as ITO) film, second electrode is the metallic film of low work function, and light passes ITO and transparent substrate emits, and wherein the material of substrate can be the thin metal of glass, plastics or other light-permeable.
Gray shade scale be meant soot-and-whitewash by black to the luminance level the white.Gray shade scale is many more, and image is from black just abundant more to white level, and details is also just clear more.Gray scale shows for image and colorize all is a very important index.In the prior art, display device generally adopts the amplitude or the pulse width of regulating with the proportional drive voltage signal of brightness to realize that gray scale shows.But the method that adopts amplitude modulation realizes the gray scale demonstration and will control mimic channel, is difficult for realizing; And adopt the method for regulating pulsewidth to want the control figure circuit, just realize than being easier to.
At present, because the chip for driving that is exclusively used in OLED seldom, the chip for driving that the OLED that gray scale shows arranged still less.Show and realize colorize that we have developed and have utilized modulation pulsewidth method to reach 1～256 grade of gray scale and constant current output, 1～32 input, output can will to be integrated into chip up to 128 the road or more driving circuit in order to make OLED be used for image better.
Summary of the invention
The purpose of this invention is to provide a kind of driving method and driving circuit that has the organic elctroluminescent device of gray scale demonstration, utilizing modulation pulsewidth method to reach 1～256 grade of gray scale and constant current output, 1～32 input, output can be up to 128 the road or more driving circuit, thereby has realized image demonstration and the colorize of OLED better.
For achieving the above object, a technical scheme of the present invention provides the driving circuit that a kind of organic elctroluminescent device gray scale shows, circuit is divided into three parts (as shown in Figure 2) by function:
(1) data input latch part, the driving that is used for shift clock signal are externally imported N data-signal successively, and are latched down and under the control of latch signal;
(2) data comparator, comprise N comparer and a counter, be used for the benchmark of the above-mentioned data input latch data that are latched partly as data comparator, the output of counter is the input of device as a comparison, counter is driven by counting clock, when the input of comparer equates with its benchmark, comparer will be exported a marking signal and quit work;
(3) constant current amplitude size, the constant-current circuit part that pulsewidth can be modulated, comprise the constant-current source circuit that the N road is identical, the size of each road constant current source output pulse width is regulated by an enable signal, and the current amplitude size of constant current source output is regulated by outside programming, constant-current circuit partly is used for the marking signal of the comparer of the above-mentioned data comparator output enable signal as constant current source, regulate the size of constant current output pulse width, when the current amplitude size that makes each road constant current source output by outside programming adjusting all is fixed as a value, the pulsewidth of each road constant current source output Iout will determine the brightness of the pixel that this road signal drives on the organic EL display panel.
Another technical scheme of the present invention provides the driving method that a kind of organic elctroluminescent device gray scale shows, this method may further comprise the steps (as shown in Figure 3):
(1) externally the driving of shift clock signal is down and under the control of latch signal, and the data input latch functional block is imported N data-signal successively, and latchs;
(2) comprise N comparer and a counter in the data comparing function piece, the data that are latched in above-mentioned (1) will be as the benchmark of data comparator, the output of counter is the input of device as a comparison, counter is driven by counting clock, when the input of comparer equates with its benchmark, comparer will be exported a marking signal and quit work;
(3) the identical constant-current source circuit in total N road in the constant current source functional block, the size of each road constant current source output pulse width is regulated by an enable signal, and the current amplitude size of constant current source output is regulated by outside programming, the marking signal of comparer output will be as the enable signal of constant current source in above-mentioned (2), regulate the size of constant current output pulse width, when the current amplitude size that makes each road constant current source output by outside programming adjusting all is fixed as a value, the pulsewidth of each road constant current source output Iout will determine the brightness of the pixel that this road signal drives on the organic EL display panel.
Like this, because the signal difference of N input, the marking signal sequential difference exported of comparer has then caused the difference of each road constant current source output pulse width, finally makes the brightness difference of different pixels, thereby has realized the gray scale demonstration.
Below by description of drawings, it is clearer that the present invention can become.
Description of drawings:
Fig. 1 is the structural representation of OLED, and wherein 11 is transparent substrates, and 12 is first electrodes, the 13rd, and organic luminous layer, 14 is second electrodes, the 15th, power supply.
Fig. 2 is a circuit function block scheme of the present invention, and wherein 21 is the data input latch functional block, and 22 is data comparing function piece, and 23 is the constant-current circuit that constant current amplitude size, pulsewidth can be modulated.
Fig. 3 is the block scheme that the present invention is used to realize gray scale and constant current output.
Fig. 4 is according to the data input latch functional block of the embodiment of the invention 1 and comparing function piece schematic diagram.
Fig. 5 is constant current adjustable size, the pulsewidth constant-source with adjustable circuit theory diagrams according to the embodiment of the invention 1.
Elaborate content of the present invention below in conjunction with drawings and Examples.Embodiment 1:
Now with 8 inputs, 16 grades of gray scales, No. 2 output circuits are that example is further set forth content of the present invention.
Fig. 4 is according to the data input latch functional block of the embodiment of the invention 1 and comparing function piece schematic diagram.DATA[7..0 wherein] be 8 bit data incoming lines, SHIFT is the data shift clock signal, Q[7..0] be the data that latch, the benchmark that is used for comparer 7485, CDATA[3..0] be the output signal of counter, be used for the input of comparer 7485, OUT1, OUT2 is the marking signal of two-way comparer output, and it will be used to control the pulsewidth of constant current source.Among Fig. 4 other signal be power supply,, signal such as synchronous.
Fig. 5 is constant current adjustable size, the pulsewidth constant-source with adjustable circuit theory diagrams according to the embodiment of the invention 1.Wherein I1～I4 is the voltage signal line inlet of programming Control constant current size, OUT1, and OUT2 is the first via, the second road sign will signal of the output of Fig. 4 comparer.Iout1, Iout2 are the constant current source output terminal.
Although describe the present invention in conjunction with the preferred embodiments, but the present invention is not limited to the foregoing description, should be appreciated that under the guiding of the present invention's design, those skilled in the art can carry out various modifications and improvement, and claims have been summarized scope of the present invention.
Claims (4)
1. the driving method that shows of an organic elctroluminescent device gray scale, this method may further comprise the steps:
(1) externally the driving of shift clock signal is down and under the control of latch signal, and the data input latch functional block is imported N data-signal successively, and latchs;
(2) comprise N comparer and a counter in the data comparing function piece, the data that are latched in above-mentioned (1) will be as the benchmark of data comparator, the output of counter is the input of device as a comparison, counter is driven by counting clock, when the input of comparer equates with its benchmark, comparer will be exported a marking signal and quit work;
(3) the identical constant-current source circuit in total N road in the constant current source functional block, the size of each road constant current source output pulse width is regulated by an enable signal, and the current amplitude size of constant current source output is regulated by outside programming, the marking signal of comparer output will be as the enable signal of constant current source in above-mentioned (2), regulate the size of constant current output pulse width, when the current amplitude size that makes each road constant current source output by outside programming adjusting all is fixed as a value, the pulsewidth of each road constant current source output Iout will determine the brightness of the pixel that this road signal drives on the organic EL display panel.
2. according to the driving method of claim 1, it is characterized in that: the signal difference of described N input, the marking signal sequential difference of comparer output has then caused the difference of each road constant current source output pulse width, finally make the brightness difference of different pixels, thereby realized the gray scale demonstration.
3. the driving circuit that shows of an organic elctroluminescent device gray scale, circuit is divided into three parts by function:
(1) data input latch part (21), the driving that is used for shift clock signal are externally imported N data-signal successively, and are latched down and under the control of latch signal;
(2) data comparator (22), comprise N comparer and a counter, be used for the data that are latched of above-mentioned data input latch part (21) benchmark as data comparator, the output of counter is the input of device as a comparison, counter is driven by counting clock, when the input of comparer equates with its benchmark, comparer will be exported a marking signal and quit work;
(3) constant current amplitude size, the constant-current circuit part (23) that pulsewidth can be modulated, comprise the constant-current source circuit that the N road is identical, the size of each road constant current source output pulse width is regulated by an enable signal, and the current amplitude size of constant current source output is regulated by outside programming, constant-current circuit part (23) is used for the marking signal of the comparer output of above-mentioned data comparator (22) enable signal as constant current source, regulate the size of constant current output pulse width, when the current amplitude size that makes each road constant current source output by outside programming adjusting all is fixed as a value, the pulsewidth of each road constant current source output Iout will determine the brightness of the pixel that this road signal drives on the organic EL display panel.
4. according to the driving circuit of claim 3, it is characterized in that: the signal difference of described N input, the marking signal sequential difference of data comparator (22) output has then caused the difference of each road constant current source output pulse width, finally make the brightness difference of different pixels, thereby realized the gray scale demonstration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011363932A CN1139907C (en) | 2001-10-12 | 2001-10-12 | Driving method and driving circuit for grey display of organic electroluminescent display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011363932A CN1139907C (en) | 2001-10-12 | 2001-10-12 | Driving method and driving circuit for grey display of organic electroluminescent display device |
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| CN1339772A CN1339772A (en) | 2002-03-13 |
| CN1139907C true CN1139907C (en) | 2004-02-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8659518B2 (en) | 2005-01-28 | 2014-02-25 | Ignis Innovation Inc. | Voltage programmed pixel circuit, display system and driving method thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100717334B1 (en) * | 2002-03-25 | 2007-05-15 | 엘지전자 주식회사 | Method and apparatus for driving electro-luminescence display device |
| JP4120326B2 (en) * | 2002-09-13 | 2008-07-16 | ソニー株式会社 | Current output type driving circuit and display device |
| CN100334613C (en) * | 2002-12-16 | 2007-08-29 | 黄志伟 | Drive chip for electroluminescent cold-light lens |
| CN1329880C (en) * | 2003-03-21 | 2007-08-01 | 友达光电股份有限公司 | Active matrix organic light emitting diode circuit capable of automatically regulating cathode voltage and its automatic regulating method |
| JP2005208241A (en) * | 2004-01-21 | 2005-08-04 | Nec Electronics Corp | Light emitting element driving circuit |
| CA2772982A1 (en) | 2009-09-02 | 2011-03-10 | Scobil Industries Corp. | Method and apparatus for driving an electroluminescent display |
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2001
- 2001-10-12 CN CNB011363932A patent/CN1139907C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8659518B2 (en) | 2005-01-28 | 2014-02-25 | Ignis Innovation Inc. | Voltage programmed pixel circuit, display system and driving method thereof |
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