CN1317777A - Drive method and circuit for organic electroluminescent display - Google Patents
Drive method and circuit for organic electroluminescent display Download PDFInfo
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- CN1317777A CN1317777A CN 01115644 CN01115644A CN1317777A CN 1317777 A CN1317777 A CN 1317777A CN 01115644 CN01115644 CN 01115644 CN 01115644 A CN01115644 A CN 01115644A CN 1317777 A CN1317777 A CN 1317777A
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Abstract
A method and circuit for driving organic electroluminescent (EL) display features that the El display is driven by line drive voltage/currnet and column drive voltage/current, which have particular waveform and are generated by said curcuit. Its advantages are no cross-induction luminous effect and long service life of EL display.
Description
The present invention relates to electroluminescence Driving technique field, specifically, relate to the driving method of display of organic electroluminescence and the driving circuit of this driving method of employing.
Organic electroluminescent (EL) device is a kind of new thin-film light emitting device, its preparation process is simple, and cost is low, is 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 drive with integrated circuit to be complementary, and luminosity height, the working temperature wide accommodation, volume is thin and light, therefore will be widely used on the various active displays.
OLED display has diode characteristic, its principle of luminosity as shown in Figure 1, on the top electrode 14 (negative electrode) of OLED display and bottom electrode 12 (anode), apply DC voltage, when voltage reaches a certain value (being commonly referred to threshold voltage), in organic thin film layer 13, meet, combine and generate exciton from the hole of anode with electronics, radiation recombination takes place and cause luminous from negative electrode.Wherein bottom electrode 12 is transparent tin indium oxide (Indium tin oxide, hereinafter to be referred as ITO) film, top electrode 14 is the metallic film of low work function, and light passes ITO and substrate 11 and emits, and wherein the material of substrate 11 can be the thin metal of glass, plastics or other light-permeable.
The driving circuit of organic EL can be divided into passive and active driving two classes.Being similar to LCD (hereinafter to be referred as LCD) dot matrix shows, OLED display also often adopts negative electrode lines and anode lines to form the passive dot matrix display mode of lattice luminous pixel in organic film both sides omnidirectional distribution, and the driving circuit of the OLED display that the present invention relates to promptly belongs to this passive drive mode.Usually we are called row or column to the anode that is parallel to each other in the passive dot matrix display screen and the negative electrode that is parallel to each other.As shown in Figure 2, when a certain plate lead 22 and 21 of a certain cathode legs are added with forward voltage, corresponding to the pixel 23 of this two strip electrodes point of crossing with luminous.
The luminescence mechanism of organic EL is different from the driven mechanism of LCD, it is a current drives, it is luminous to be similar to light emitting diode (hereinafter to be referred as LED), but accompany the insulativity organic substance between organic EL electrode, it not only has diode property, also have stronger capacitance characteristic simultaneously, require the driving circuit can be rapidly to capacitor charge and discharge; Organic EL drive current is much smaller than LED, driving voltage but is higher than LED, control high-tension transfer problem if utilize led drive circuit just to exist TTL gate (hereinafter to be referred as TTL) level, therefore, the driving circuit of LED is not suitable for organic EL.In order to show organic EL device, must exploitation corresponding driving circuit.At present, the someone adopts improved led drive circuit, such as " photoelectron, laser ", and the 10th the 3rd phase of volume, " the driving circuit research of organic light-emitting diode matrix display screen " of thanking to the big good people of grade; Also the someone adopts improved LCD driving circuit; The driving circuit that is specifically designed to organic EL is also arranged, and is the Jap.P. of 11-45071 as publication number.The circuit of these reports has all roughly satisfied the purpose that organic EL dot matrix shows, but they all do not solve the distinctive inducing luminous problem that influences display quality of organic EL device.
The driving method and the circuit that the purpose of this invention is to provide a kind of organic EL device, it is distinctive because of the inducing luminous problem that influences display quality that it can solve organic EL device, and improve the display life of organic EL device.
Above-mentioned purpose of the present invention realizes by following Method and circuits is provided.
According to a scheme of the present invention, a kind of electroluminescence driving method that is used for electroluminescent device is provided, comprise step:
(1) produces the overhead control signal;
(2) produce basic row signal (51) and fundamental sequence signal (53) according to described overhead control signal;
(3) have specific with described overhead control signal, described basic row signal and the generation of described fundamental sequence signal controlling
Capable drive level/the electric current (52) of waveform (52,54) and row drive level/electric current (54);
(4) use the capable drive level/electric current that produced and row drive level with specific waveforms (52,54)/
Stream drives described electroluminescent device.
According to another aspect of the present invention, provide a kind of electroluminescence drive circuit that is used for electroluminescent device, it comprises:
The CPU/MCU control circuit is used to produce the overhead control signal;
Line control circuit and arrange control circuit are used for producing basic row signal and fundamental sequence letter according to described overhead control signal
Number;
Horizontal drive circuit and column drive circuit are used to drive electro-luminescence display device;
Electro-luminescence display device is used for display message;
It is characterized in that: described row/column drive circuit is at described CPU/MCU control circuit and described row/arrange control circuit
Control produce down capable drive level/electric current and the row drive level/electric current with specific waveforms (52,54), institute
Stating electro-luminescence display device is to drive with this capable drive level/electric current and row with specific waveforms (52,54)
Level/current drives.The present invention has following advantage:
1. the OLED display brightness height of driving method among employing the present invention and circuit, clear image, low in energy consumption.
2. adopt level (or electric current) change-over circuit among the present invention, suppressed inducing luminous effectively.
3. adopt the present invention to help prolonging the serviceable life of organic EL device.
Describe the present invention below in conjunction with accompanying drawing and an embodiment:
Fig. 1 is the organic EL device structure diagram
Fig. 2 is the passive dot matrix display mode of organic EL device
Fig. 3 is according to OLED display driving method process flow diagram of the present invention
Fig. 4 is according to OLED display driving circuit block diagram of the present invention
The signal that Fig. 5 produces respectively for OLED display row/arrange control circuit according to the present invention and corresponding row/column drive circuit output signal synoptic diagram
Fig. 6 is a kind of signal schematic representation with specific waveforms 52,54 according to OLED display row of the present invention/column drive circuit output
Fig. 7 is as a kind of 32 * 16 passive dot matrix OLED display driving circuit principle schematic according to the embodiment of the invention
The flow process of the organic EL device driving method among the present invention as shown in Figure 3, at first produce overhead control signal 31, produce basic row signal 32 and fundamental sequence signal 33 according to overhead control signal 31, generate capable drive level/electric current 34 and row drive level/electric current 35 according to overhead control signal 31, basic row signal 32 and 33 controls of fundamental sequence signal afterwards with specific waveforms (the following describes); Drive OLED display 36 with this capable drive level/electric current 34 and row drive level/electric current 35 with specific waveforms (the following describes).Overhead control signal 31 is used for controlling the sequential of whole driving, guarantee row synchronously; Basic row signal controlling 32 produces basic capable control signal under the effect of overhead control signal 31, if driving circuit adopts the mode of line scanning, then it produces sweep signal, if driving circuit adopts the mode of column scan, then it is a data-signal; Fundamental sequence signal controlling 33 produces basic row control signal under the effect of overhead control signal 31, if driving circuit adopts the mode of column scan, then it produces sweep signal, if driving circuit adopts the mode of line scanning, then it is a data-signal; Capable drive level/the electric current 34 that is produced, under the effect of overhead control signal 31 and basic row signal 32, for positive and negative adjustable, pulsewidth is adjustable, the capable drive level/current signal of adjustable amplitude value; Row drive level/the electric current 35 that is produced, under the signal effect of overhead control signal 31 and fundamental sequence signal 33, also be positive and negative adjustable, pulsewidth is adjustable, the row drive level/current signal of adjustable amplitude value.
OLED display driving circuit among the present invention as shown in Figure 4, comprising CPU (or MCU) control circuit 41, line control circuit 42, arrange control circuit 43, horizontal drive circuit 44, column drive circuit 45.46 is OLED display among the figure.Wherein the row, column driving circuit is by CPU (or MCU) and row, column control circuit signal controlling, and CPU (or MCU) mainly produces overhead control and synchronizing signal.
Fig. 5 is the control signal 51 that OLED display row of the present invention/arrange control circuit produces, 53 with the output signal 52 of corresponding row/column drive circuit, the synoptic diagram of relation between 54, wherein the signal 51,53 that produces respectively of row/arrange control circuit is preferably amplitude and is+pulse signal of 5V, and corresponding horizontal drive circuit output signal 52 amplitudes are from V1 to V3, corresponding column drive circuit output signal 54 amplitudes are from V2 to V4, V0 is a reference value, V0, V1, V2, V3 and V4 are real number herein, its expression voltage or current value, its value is adjustable in circuit.Pulse width T 1, T2, T3 and T4 can regulate according to the size of ranks number, display gray scale etc.Adjusting the value of V1, V2, V3 and V4 can adjust the luminous intensity of selected pixel and not choose pixel to be reversed the intensity that energising is used to discharge, regulate the value of T1, T2, T3 and T4 and can adjust the fluorescent lifetime of selected pixel, the time of discharge, and the display screen that can adapt to the different rows columns.
Use the signal that has specific waveforms according to the present invention 52,54 shown in Figure 5 to drive organic EL device, can eliminate the cross-inductive luminescence phenomenon in the organic display spare effectively, and the life-span of having improved organic EL device, realize purpose of the present invention.
Fig. 6 is an example of the signal with specific waveforms 52,54 of OLED display row among the present invention/column drive circuit output.When driving circuit is taked line scanning mode, behavior negative electrode, select V0=0v, V1 〉=V2＞0 〉=V3 〉=V4, and establish V1, V2, V3, V4 are voltage signal, if line scan signals makes certain delegation selected, then the value of horizontal drive circuit output signal 61 is V3.If certain shows data-signal this moment, the value of column drive circuit output signal 62 is V2, and then selected corresponding to the picture element of these row of this row, when the making alive V2-V3=V2 of institute was greater than threshold voltage on this pixel, this pixel was luminous.At this moment, do not comprise half selected point all non-reconnaissance pixels row (being anode) meet V4, row (being negative electrode) meets V1, at this moment it is anti-inclined to one side that light emitting diode (being pixel) is gone up voltage, remain in pixel in the pixel when luminous the electric charge of accumulation bled off, pixel is in degree of depth cut-off state, has suppressed faradic generation in the pixel, has improved antijamming capability.Be in the pixel of half selected point, institute's making alive is respectively V4-V3 (row choose, row do not choose) and V2-V1 (in the column selection on it, row is not chosen), it is negative value, makes the pixel that is in half selected point also be in cut-off state, and this also will suppress to produce in the pixel induction current effectively.
Row/column drive circuit of the present invention utilizes the controllable output signal voltage of Transistor-Transistor Logic level up to 30V.
Need to prove, add sweep signal on the row among the embodiment, list the addend number of it is believed that, and method of the present invention can be used for equally listing and adds sweep signal, the type of drive of the addend number of it is believed that on the row.
Fig. 7 is the organic el panel driving circuit of 32 * 16 passive dot matrix principle schematic as embodiment.Wherein, V0=V3=V4=0, V1=V2=VCC
Adopt driving method of the present invention and circuit arrangement, 32 * 16 dot matrix display screen devices of being developed, driving voltage can reach 30 volts, and graphic presentation is clear, has suppressed inducing luminous phenomenon fully, and contrast has obtained remarkable increase.
The present invention is not limited to above-mentioned certain embodiments, the present invention should understand like this, under the prerequisite of the spirit and scope of the invention that does not break away from the claims qualification, those skilled in the art can do various forms of modifications, and it all should comprise within the scope of the present invention.
Claims (6)
1 one kinds of electroluminescence driving methods that are used for electroluminescent device comprise step:
(1) produces the overhead control signal;
(2) produce basic row signal (51) and fundamental sequence signal (53) according to described overhead control signal;
(3) have specific with described overhead control signal, described basic row signal and the generation of described fundamental sequence signal controlling
Capable drive level/the electric current (52) of waveform (52,54) and row drive level/electric current (54);
(4) use the capable drive level/electric current that produced and row drive level with specific waveforms (52,54)/
Stream drives described electroluminescent device.
2 methods according to claim 1 are characterised in that described electroluminescent device is an organic elctroluminescent device.
3 methods according to claim 1 or 2 are characterised in that described signal with specific waveforms (52,54), its width of cloth
The value (V1, V2, V3, V4) and pulsewidth (T1, T2, T3, T4) adjustable.
4 one kinds of electroluminescence drive circuits that are used for electroluminescent device comprise:
The CPU/MCU control circuit is used to produce the overhead control signal;
Line control circuit and arrange control circuit are used for producing basic row signal and fundamental sequence letter according to described overhead control signal
Number;
Horizontal drive circuit and column drive circuit are used to drive electro-luminescence display device;
Electro-luminescence display device is used for display message;
It is characterized in that: described row/column drive circuit is at described CPU/MCU control circuit and described row/arrange control circuit
Control produce down capable drive level/electric current and the row drive level/electric current with specific waveforms (52,54), institute
Stating electro-luminescence display device is to drive with this capable drive level/electric current and row with specific waveforms (52,54)
Level/current drives.
5 driving circuits according to claim 4 are characterised in that described electroluminescent device is an organic elctroluminescent device.
6 driving circuits according to claim 4 or 5 are characterised in that described signal with specific waveforms (52,54),
Its amplitude (V1, V2, V3, V4) and pulsewidth (T1, T2, T3, T4) adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115644 CN1133148C (en) | 2001-04-29 | 2001-04-29 | Drive method and circuit for organic electroluminescent display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115644 CN1133148C (en) | 2001-04-29 | 2001-04-29 | Drive method and circuit for organic electroluminescent display |
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| CN1317777A true CN1317777A (en) | 2001-10-17 |
| CN1133148C CN1133148C (en) | 2003-12-31 |
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|---|---|---|---|
| CN 01115644 Expired - Fee Related CN1133148C (en) | 2001-04-29 | 2001-04-29 | Drive method and circuit for organic electroluminescent display |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311418C (en) * | 2002-07-31 | 2007-04-18 | 精工爱普生株式会社 | Electronic circuit, elecro-optical device, and electronic apparatus |
| CN100449772C (en) * | 2003-04-15 | 2009-01-07 | 罗姆股份有限公司 | Organic electric luminous element driving driving circuit and organic electron luminous display equipment |
| CN100454376C (en) * | 2003-06-06 | 2009-01-21 | 罗姆股份有限公司 | Organic el panel drive circuit and organic el display device using the same drive circuit |
| CN109239993A (en) * | 2018-10-18 | 2019-01-18 | 华北水利水电大学 | A kind of liquid crystal optical switch for optical phased array scanning |
-
2001
- 2001-04-29 CN CN 01115644 patent/CN1133148C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311418C (en) * | 2002-07-31 | 2007-04-18 | 精工爱普生株式会社 | Electronic circuit, elecro-optical device, and electronic apparatus |
| CN100449772C (en) * | 2003-04-15 | 2009-01-07 | 罗姆股份有限公司 | Organic electric luminous element driving driving circuit and organic electron luminous display equipment |
| CN100454376C (en) * | 2003-06-06 | 2009-01-21 | 罗姆股份有限公司 | Organic el panel drive circuit and organic el display device using the same drive circuit |
| CN109239993A (en) * | 2018-10-18 | 2019-01-18 | 华北水利水电大学 | A kind of liquid crystal optical switch for optical phased array scanning |
| CN109239993B (en) * | 2018-10-18 | 2021-03-26 | 华北水利水电大学 | Liquid crystal optical switch for optical phased array scanning |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1133148C (en) | 2003-12-31 |
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