CN106251813B - Electrowetting drive waveforms generation method based on constant power and system - Google Patents
Electrowetting drive waveforms generation method based on constant power and system Download PDFInfo
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- CN106251813B CN106251813B CN201610806468.9A CN201610806468A CN106251813B CN 106251813 B CN106251813 B CN 106251813B CN 201610806468 A CN201610806468 A CN 201610806468A CN 106251813 B CN106251813 B CN 106251813B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/348—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on the deformation of a fluid drop, e.g. electrowetting
Abstract
The electrowetting drive waveforms generation method based on constant power that the invention discloses a kind of, the power are expressed as：Wherein g1(t) it is t0To t1The wave function of period, g2(t) it is t1To t2The wave function of period, V1For pixel extremely on the constant positive voltage that connects；When keeping same power, wherein drive the stage, i.e. t0To t1Stage driving voltage gradually increases, t1Moment voltage difference reaches maximum value；Restoration stage, i.e. t1To t2Stage, voltage difference are decreased to 0.A kind of electrowetting drive waveforms generation system based on constant power, including microcontroller, operational amplifier, DAC0832, the output end of the microcontroller and the input terminal of DAC0832 connect, and the output end of the DAC0832 and the input terminal of operational amplifier connect.The invention enables the effective power for reducing drive waveforms, extend the service life of Electrowetting device.It using the waveform gradually changed, prevents ink from dividing during the motion, is widely used in electrowetting field.
Description
Technical field
The present invention relates to electrowetting fields, specially electrowetting drive waveforms generation method and system based on constant power.
Background technology
Electrowetting is by changing the voltage between drop and insulating substrate, and then wetting of the change drop on substrate
Property, that is, change contact angle, so that drop is deformed upon, displacement the phenomenon that.
It is coated with oleophilic drainage insulating layer on TFT electrode layers, pixel wall is constructed using photoetching material on insulating layer, is then existed
Pixel bottom is coated with one layer of black pigment oil film, and entire substrate is placed in water, and is packaged together structure with the ito glass on top
At display screen.For pixel when being not powered on, ink is paved with entire pixel bottom, and the color of ink is presented in pixel at this time；When to lower layer
After TFT substrate and upper layer ito glass are powered, you can change the wettability effect of hydrophobic material, the surface of original water resistant becomes more
Hydrophilic, the surface tension of oil droplet, which changes, is transferred to side, which shows the color (white) of bottom.In this way, passing through
The switching that the voltage that pixel applies realizes two kinds of colors of black and white of pixel is controlled, it is exhausted to be detached from oleophilic drainage by change dyeing oil droplet
The amount of edge layer, the i.e. size of the reflective surface area of exposure in water, can modulate various gray-scale intensities.Entire generating structure letter
It is single, it is at low cost, it is easy to accomplish extensive manufacture.
It is now generally driven using square wave, is driven by the voltage and duty ratio of controlling application waveform to realize
It is dynamic, regulate grayscale at different levels by controlling the pressure difference of upper and lower base plate.However square wave is used to drive, needed for this drive waveforms
It wants driving power larger, the service life for being easy to influence Electrowetting device is used for a long time, easily causes damage.It is therefore desirable to carry out
It improves.
Invention content
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of, and the preferably electrowetting based on constant power is driven
Dynamic Waveform generation method and system.
The technical solution adopted in the present invention is：
A kind of electrowetting drive waveforms generation method based on constant power, the power are expressed as：
Wherein g1(t) it is t0To t1The wave function of period, g2(t) it is t1To t2The wave function of period, V1For pixel pole
On the constant positive voltage that connects；
When keeping same power, wherein drive the stage, i.e. t0To t1Stage driving voltage gradually increases, t1Moment voltage
Difference reaches maximum value；
Restoration stage, i.e. t1To t2Stage, voltage difference are decreased to 0.
As the improvement of the technical solution, the driving stage waveform includes linear, parabolical.
As the improvement of the technical solution, the waveform in the driving stage is the straight line that slope is less than 0, the Restoration stage
It is more than 0 straight line for slope.
Further, the driving stage waveform is the straight line that slope is less than 0, and Restoration stage is the straight line that slope is 0.
Further, when the constant power, the maximum drive voltage of triangular wave and trapezoidal wave is all higher than the maximum of square wave and drives
Dynamic voltage.
Further, wherein driving the stage, the frequency of triangular wave is twice of square wave frequency, the frequency and square wave of trapezoidal wave
It is equal, the pixel extremely on the constant positive voltage V1 that connects it is equal with the maximum value of negative drive voltage.
On the other hand, the present invention also provides a kind of, and the electrowetting drive waveforms based on constant power generate system, including monolithic
Machine, operational amplifier, DAC0832, the output end of the microcontroller and the input terminal of DAC0832 connect, and the DAC0832's is defeated
The input terminal of outlet and operational amplifier connects.
The beneficial effects of the invention are as follows：Electrowetting drive waveforms generation method provided by the invention based on constant power and it is
System, passes through the waveform of generation so that the effective power for reducing drive waveforms extends electrowetting under the premise of Same Efficieney
The service life of device.Using the waveform gradually changed, it can prevent ink from dividing during the motion in this way, avoid because of ink
Display brightness caused by division reduces, and extends recovery time, display effect reduces.
Description of the drawings
The specific implementation mode of the present invention is described further below in conjunction with the accompanying drawings：
Fig. 1 is the module connection diagram of one embodiment of the invention；
Fig. 2 is the circuit theory schematic diagram of one embodiment of the invention；
Fig. 3 is square wave driving schematic diagram；
Fig. 4 is the triangular wave driving schematic diagram of one embodiment of the invention；
Fig. 5 is the trapezoidal wave driving schematic diagram of one embodiment of the invention；
Fig. 6 is the driving voltage and aperture opening ratio relation schematic diagram of one embodiment of the invention；
Fig. 7 be one embodiment of the invention maximum drive voltage be 20V when trapezoidal wave aperture opening ratio schematic diagram；
Fig. 8 be one embodiment of the invention maximum drive voltage be 15V when square wave aperture opening ratio schematic diagram；
Fig. 9 be one embodiment of the invention maximum drive voltage be 20V when triangular wave aperture opening ratio schematic diagram；
Figure 10 is the triangular wave driving schematic diagram of another embodiment of the present invention.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
A kind of electrowetting drive waveforms generation method based on constant power, the power are expressed as：
Wherein g1(t) it is t0To t1The wave function of period, g2(t) it is t1To t2The wave function of period, v1For pixel pole
On the constant positive voltage that connects；
When keeping same power, wherein drive the stage, i.e. t0To t1Stage driving voltage gradually increases, t1Moment voltage
Difference reaches maximum value；
Restoration stage, i.e. t1To t2Stage, voltage difference are decreased to 0.
As the improvement of the technical solution, the driving stage waveform includes linear, parabolical.
As the improvement of the technical solution, the waveform in the driving stage is the straight line that slope is less than 0, the Restoration stage
It is more than 0 straight line for slope.
Further, the driving stage waveform is the straight line that slope is less than 0, and Restoration stage is the straight line that slope is 0.
Further, when the constant power, the maximum drive voltage of triangular wave and trapezoidal wave is all higher than square wave, but three
Maximum drive voltage all must be within the scope of rational, under the premise of not damaging EFD devices.
Further, wherein driving the stage, the frequency of triangular wave is twice of square wave frequency, the frequency and square wave of trapezoidal wave
It is equal, the pixel extremely on the constant positive voltage v that connects1It is equal with the maximum value of negative drive voltage.
On the other hand, the present invention also provides a kind of, and the electrowetting drive waveforms based on constant power generate system, including monolithic
Machine, operational amplifier, DAC0832, the output end of the microcontroller and the input terminal of DAC0832 connect, and the DAC0832's is defeated
The input terminal of outlet and operational amplifier connects.
Referring to Fig.1, it is the module connection diagram of one embodiment of the invention.Microcontroller wants real using programming mode generation
Existing waveform, the waveform pass through DAC0832, and digital signal is converted into analog signal, finally by operational amplifier by the mould
Quasi- signal is amplified to the drive signal of needs, wherein adjusting the size of voltage by power supply, passes through different voltages, different wave
To test the size of aperture opening ratio.
It is the circuit theory schematic diagram of one embodiment of the invention with reference to Fig. 2.Its by the I/O port of one-chip computer module with
The interface of DAC0832 modules connects, and the DAC0832 modules are also connect with power supply.
It is that the waveform of square wave driving, triangular wave driving and trapezoidal wave driving shows respectively with reference to Fig. 3-5 as an embodiment
It is intended to.
Wherein rating formula is：
Wherein g1(t) the wave function formula during being t0 to t1, g2(t) the wave function formula during being t1 to t2 is logical
Integral and calculating is crossed to calculate each waveform power.Wherein because pixel extremely on connect constant positive voltage v1, at driving end
Added driving voltage and v1Voltage difference is exactly actual driving voltage.
By taking drive waveforms involved in this experiment as an example, each drive waveforms indicate as follows：
Square wave：g1(t)=v2(0≤t ＜ t1)
g2(t)=v1(t1 ＜ t≤t2)
Triangular wave：g1(t)=k1T (0≤t ＜ t1), wherein k1=v2/t1
g2(t)=k2t+v2(t1 ＜ t≤t2), wherein k2=v1/(t2-t1)
Trapezoidal wave：g1(t)=k1T (0≤t ＜ t1), wherein k1=v2/t1
g2(t)=v1(t1 ＜ t≤t2)
Being applied equally to other has other waveforms of this category feature.
Wherein triangular wave gradually increased before this between t0-t1 arrives maximum differential pressure, maximum in t1 moment pressure difference；T1-t2 it
Between, pressure difference is gradually reduced, from v1It is reduced to 0.
It is gradually increased between t0-t1 in trapezoidal wave, maximum in t1 moment pressure difference, this gradually increased voltage is more applicable
In the characteristic of droplet of ink, oil droplet will not be caused to tear because of voltage abruptly increase.It can be kept in driving later good
Activity.It is Restoration stage between t1-t2.
Under the premise of constant power, the maximum drive voltage of triangular wave is twice of square wave, passes through above integral formula
And above-mentioned each drive waveforms expression formula, it can directly calculate, driving effect is also superior to square wave；And the maximum drive of trapezoidal wave
Voltage is equally better than square wave also greater than square wave, driving effect.The two kinds of waveforms generated in this programme are superior to square wave, by optimization
Effect is better than the square wave under constant power afterwards.
Driven using negative voltage in this section of electrowetting drives, i.e., pixel extremely on connect constant positive voltage v1,
Drive the driving voltage and v added by end1Voltage difference is exactly actual driving voltage.By taking square wave as an example, applied between t0-t1
Be driving voltage, which can open, and achieve the effect that driving；And it is in and restores in this stage of t1-t2
In the stage, it is 0 which, which is added in the voltage difference on EFD,.
As an embodiment, in these three waveforms, wherein horizontal axis be driving time, the duty ratio that square wave uses for
50%, wherein entirely used frequency is 45HZ in the process for driving for square wave, trapezoidal wave, and the set period is 22ms, and three
The frequency of angle wave is 90HZ, and period 11ms, the longitudinal axis is driving voltage, is divided into three node voltages, V0, v1、v2, wherein v1=-
v2。
During actual driving, using existing electrowetting slice, thin piece, is first driven with square wave, change the driving of square wave
Voltage compares driving effect.The relationship of wherein driving voltage and aperture opening ratio is as shown in Figure 6.Wherein curve 1 represents voltage value
Variation, unit v, curve 2 represent the variation of aperture opening ratio.
Aperture opening ratio refers to and applies certain voltage between top crown and hearth electrode, and oil droplet is shunk, and is detached from oleophilic drainage insulating layer
Surface, reflected light largely is directly gone out by water back reflection, only fraction cannot be reflected away by oil droplet, pixel
It is indicated generally at illuminated state and "ON" state occurs, and it is aperture opening ratio that area white at this time, which accounts for the percentage of total elemental area,.Picture
It is to embody device to express the most intuitive factor of contrast size that the aperture opening ratio of element, which shows electrowetting,.
By the threshold voltage that is driven in existing slice, thin piece is+(threshold voltage is according to the difference of electrowetting material by -12V
And different), (do not puncture picture in a stepping manner and in the voltage range that electrowetting can be born to find optimal drive voltage
Vegetarian refreshments), optimal drive voltage is+- 20V, and voltage continues to be easy to cause the damage of electrowetting slice, thin piece if increasing.Wherein driving voltage
For+- 15V when aperture opening ratio be 43.6%.
Optimal drive voltage based on square wave is+- 20V, by v in involved triangular wave and trapezoidal wave1It is set as
20V can be obtained at this time according to the characteristic of three kinds of different waves：The power of the triangular wave of 20V is equivalent to+square wave of -10V, and
The power of the trapezoidal wave of 20V is equivalent to+square wave of -15V.
With reference to Fig. 7-9, the aperture opening ratio that 20V triangular waves are obtained by experiment test is 42.8%, is equivalent to+voltage the sides-14V
The aperture opening ratio of wave, the square wave with its constant power is+- 10V, and the square wave of+- 10V is unable to normal driving.Therefore constant power feelings
The driving effect of triangular wave is better than square wave under condition.
The aperture opening ratio of the trapezoidal wave of 20V is 48.1% ,+the aperture opening ratio of -17V square-wave voltages is equivalent to, with its constant power
Square wave is+- 15V (aperture opening ratio 43.6%), and in comparison, therefore the driving effect of trapezoidal wave is better than side in the case of constant power
Wave.
Under the premise of constant power, by controlling the shape of waveform, corresponding triangular wave, trapezoidal wave is devised, is compared
Aperture opening ratio finds that triangular wave, trapezoidal wave can be better than square wave.
Triangular wave and square wave are compared, and power reduces half, and the initial voltage of triangular wave driving slowly increases,
Square wave of the aperture opening ratio of the triangular wave of 20V better than+- 10V in the case of constant power.
Trapezoidal wave and square wave are compared, and power also reduces accordingly, and in the driving stage, square wave is to maintain v2No
Become, and trapezoidal wave is slowly increased in this stage, the in comparison small part of power.Its driving voltage slowly increases, and
It is not the same abruptly increase of image space wave, under the premise of constant power, the square wave of the aperture opening ratio of the trapezoidal wave of 20V better than+- 15V.
Triangular wave and trapezoidal wave are all made of the mode for gradually increasing voltage, are more in line with the kinetic property of ink.
In the case of constant power, triangular wave, trapezoidal wave are better than square wave, and square wave can extend the use longevity of Electrowetting device
Life, it is equirotal in aperture opening ratio, it is possible to reduce effective power.In the drive waveforms of trapezoidal wave, in the driving stage, electricity
Pressure avoids the situation that voltage abruptly increase causes ink unstable using gradual increased mode.
Referring to Fig.1 0, it is the embodiment of another triangular wave.The triangular wave is during driving, using being gradually reduced voltage
Mode, first increase to maximum voltage and then slowly reduce；Into recovery time, when pressure difference therein is reduced under threshold voltage
When will stop driving.It is compared with square wave, the equal abruptly increase of driving voltage, but triangular wave first increases to maximum voltage and then slowly subtracts
Enter recovery time less, will stop driving when pressure difference therein is reduced under threshold voltage.Its period of the triangular wave is
The half of square wave, in comparison power reduce half, the initial voltage of triangular wave driving is as square wave, then subtracting slowly
It is few, in square wave of the aperture opening ratio better than+- 10V of the triangular wave of constant power 20V.The triangular wave compares with trapezoidal wave, ladder
Shape wave is more in line with the kinetic property of ink by the way of gradually increasing voltage.
Under the premise of Same Efficieney, their power is the same, but the aperture opening ratio of triangular wave and trapezoidal wave is substantially better than
Square wave.In a certain range, Electrowetting device is driven using the drive waveforms of triangular wave and trapezoidal wave, can not only made out
Mouth rate increases, display effect enhances, moreover it is possible to which the service life for extending Electrowetting device reduces the effective power of drive waveforms.
It is to be illustrated to the preferable implementation of the present invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations or be replaced under the premise of without prejudice to spirit of that invention
It changes, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (6)
1. a kind of electrowetting drive waveforms generation method based on constant power, which is characterized in that the power is expressed as：
Wherein g1(t) it is t0To t1The wave function of period, g2(t) it is t1To t2The wave function of period, v1For pixel extremely on connect
Constant positive voltage；
When keeping same power, wherein drive the stage, i.e. t0To t1Stage driving voltage gradually increases, t1Moment voltage difference reaches
To maximum value；
Restoration stage, i.e. t1To t2Stage, voltage difference are decreased to 0.
2. the electrowetting drive waveforms generation method according to claim 1 based on constant power, it is characterised in that：The drive
Dynamic stage waveform includes linear, parabolical.
3. the electrowetting drive waveforms generation method according to claim 2 based on constant power, it is characterised in that：The drive
The waveform in dynamic stage is the straight line that slope is less than 0, and the Restoration stage is the straight line that slope is more than 0.
4. the electrowetting drive waveforms generation method according to claim 3 based on constant power, it is characterised in that：The drive
Dynamic stage waveform is the straight line that slope is less than 0, and Restoration stage is the straight line that slope is 0.
5. the electrowetting drive waveforms generation method according to claim 4 based on constant power, it is characterised in that：Same work(
When rate, the maximum drive voltage of triangular wave and trapezoidal wave is all higher than the maximum drive voltage of square wave.
6. the electrowetting drive waveforms generation method according to claim 5 based on constant power, it is characterised in that：Wherein drive
Dynamic stage, the frequency of triangular wave are twice of square wave frequency, and the frequency and square wave of trapezoidal wave are equal, the pixel extremely on the perseverance that connects
It is equal with the maximum value of negative drive voltage to determine positive voltage V1.
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| CN107591132A (en) * | 2017-09-21 | 2018-01-16 | 重庆秉为科技有限公司 | Driving method based on electric wet-type display |
| CN109408766B (en) * | 2018-09-26 | 2023-05-16 | 国网山西省电力公司电力科学研究院 | Ladder diagram frequency calculation method |
| CN109300437B (en) * | 2018-11-07 | 2020-11-24 | 深圳市国华光电科技有限公司 | Electrowetting display device driving method and system |
| CN110085175B (en) * | 2019-04-22 | 2021-05-04 | 深圳市国华光电科技有限公司 | Electrowetting ink driving method and related equipment |
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| CN101800032A (en) * | 2009-02-06 | 2010-08-11 | 精工爱普生株式会社 | The driving method of electrophoretic display apparatus, electrophoretic display apparatus and electronic equipment |
| CN102317852A (en) * | 2008-12-12 | 2012-01-11 | 株式会社普利司通 | Information display panel drive method |
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| JP5600456B2 (en) * | 2009-05-19 | 2014-10-01 | ローム株式会社 | Light emitting diode drive circuit, light emitting device and display device using the same, and drive circuit protection method |
| JP6200149B2 (en) * | 2012-12-07 | 2017-09-20 | 株式会社Ｊｖｃケンウッド | Liquid crystal display device and driving method thereof |
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| CN102317852A (en) * | 2008-12-12 | 2012-01-11 | 株式会社普利司通 | Information display panel drive method |
| CN101800032A (en) * | 2009-02-06 | 2010-08-11 | 精工爱普生株式会社 | The driving method of electrophoretic display apparatus, electrophoretic display apparatus and electronic equipment |
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Application publication date: 20161221 Assignee: Guangxian Technology (Guangdong) Co.,Ltd. Assignor: SHENZHEN GUOHUA OPTOELECTRONICS Co.,Ltd.|ACADEMY OF SHENZHEN GUOHUA OPTOELECTRONICS Contract record no.: X2023980038754 Denomination of invention: Method and System for Generating Electric Wetting Drive Waveform Based on Equal Power Granted publication date: 20180925 License type: Exclusive License Record date: 20230728 |