CN111192558A - Driving method of electronic ink for display - Google Patents
Driving method of electronic ink for display Download PDFInfo
- Publication number
- CN111192558A CN111192558A CN202010045919.8A CN202010045919A CN111192558A CN 111192558 A CN111192558 A CN 111192558A CN 202010045919 A CN202010045919 A CN 202010045919A CN 111192558 A CN111192558 A CN 111192558A
- Authority
- CN
- China
- Prior art keywords
- ink
- electrowetting
- voltage
- driving
- waveform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000001788 irregular Effects 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 abstract description 6
- 230000008602 contraction Effects 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004043 dyeing Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 101100243951 Caenorhabditis elegans pie-1 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
The invention discloses a driving method of electronic ink for display, which comprises the steps of calculating electrowetting ink driving voltage U of an electrowetting element, editing the electrowetting ink driving voltage U and forming and loading voltage waveforms, improves the stability of electrowetting ink contraction through the waveform characteristics of sine waves, effectively improves the maximum contraction degree of electrowetting ink, overcomes the problems of easy dispersion of ink droplets and low ink contraction degree in the prior art, can more accurately control the size of an opening rate, more effectively controls the shape of ink movement, improves the stability of ink, and realizes the maximization of the opening rate.
Description
Technical Field
The invention relates to the technical field of electrowetting display, in particular to a driving method of electronic ink for display.
Background
An Electrowetting (EWD) display technology belongs to a reflective display technology, an electrowetting device is applied under the condition of no electric field, the polar liquid with dyeing in the device is paved on the whole pixel unit, the pixel unit displays the color of the polar liquid, after a driving voltage is applied, the pixel unit dyeing liquid (such as ink) shrinks, so that a white bottom plate is exposed, the pixel unit dyeing liquid is switched between the paving state and the shrinking state, and the gray scale display of a pixel is realized.
The square wave voltage shown in fig. 1 satisfies the requirement of fast response of electrowetting, but the phenomenon of ink dispersion occurs in the aspect of driving pixels of electrowetting display, ink droplets usually shrink to two or three corners, the contact area of ink and a substrate is increased, so that the aperture ratio of electrowetting is reduced, the display effect is affected, the more the ink droplets are dispersed, the lower the aperture ratio is, the smaller the display area of the white substrate is, and the shape of ink greatly affects the area of the white substrate of electrowetting display.
Although the step waveform voltage shown in fig. 2 greatly reduces the problem of droplet scattering and the waveform contraction becomes stable and reliable, the aperture ratio in electrowetting is not ideal and it is difficult to satisfy the effect of dynamic display of electrowetting.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a driving method of electronic ink for display, which has high aperture ratio and stable aperture ratio change.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a driving method of electronic ink for display includes calculating driving voltage U of electrowetting element, editing driving voltage waveform of electrowetting ink, obtaining driving voltage waveform of electrowetting ink by high-voltage amplifier after editing driving voltage U of electrowetting ink by editable function generator, and loading driving voltage waveform of electrowetting ink output by high-voltage amplifier to input port of electrowetting display screen.
The electrowetting ink driving voltage U is as follows:
U＝10-4x2+1(sin(x)+bx)。
the electrowetting printing ink driving voltage waveform is periodic waveform, the electrowetting printing ink driving voltage U of each waveform period is the same, each waveform period comprises a forward irregular half sine wave, and the voltage increases from an initial value to a peak value according to a preset change rate.
The voltage rise time of the electrowetting ink drive voltage U is longer than the voltage fall time.
The electrowetting display screen is electrowetting printing ink electronic paper.
The invention has the beneficial effects that: the invention improves the stability of the electro-wetting ink shrinkage through the waveform characteristics of the sine wave, effectively improves the maximum shrinkage degree of the electro-wetting ink, overcomes the problems of easy dispersion of ink liquid drops and low ink shrinkage degree in the prior art, can more accurately control the size of the aperture opening ratio, more effectively controls the shape of ink movement, improves the stability of the ink and realizes the maximization of the aperture opening ratio.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a waveform diagram of a square wave voltage;
FIG. 2 is a waveform diagram of a step waveform voltage;
FIG. 3 is a waveform diagram of an electrowetting ink drive voltage U;
FIG. 4 is a graph of ink shapes and corresponding aperture ratios captured by an electrowetting display screen loaded with a square wave voltage;
FIG. 5 is a flow chart of a method of the present invention;
FIG. 6 is a graph showing the variation of the aperture ratio of an electrowetting display panel loaded with a step waveform voltage;
FIG. 7 is a graph of the change in aperture ratio of an electrowetting display screen loaded with electrowetting ink driver U;
fig. 8 is a graph comparing the change in aperture ratio for 3 different driving voltages.
Detailed Description
Referring to fig. 3, a driving method of electronic ink for display includes calculating an electrowetting ink driving voltage U of an electrowetting element, editing the electrowetting ink driving voltage U using an editable function generator, obtaining an electrowetting ink driving voltage waveform through a high voltage amplifier, and applying the electrowetting ink driving voltage waveform output by the high voltage amplifier to an input port of an electrowetting display screen.
The electrowetting ink driving voltage U is as follows:
U＝10-4x2+1(sin(x)+bx)。
wherein b is any constant, and generally b is 0 or 1.
Calculation and loading of the electrowetting ink drive U is prior art and can be performed using a computer that is readable and stored, and the output voltage loading of the high voltage amplifier can be performed using a common voltage loader.
The electrowetting ink driving voltage U utilizes the proportion of lengthened voltage rising in one driving period and combines the characteristic of slow rising of a sine function, so that the aperture opening ratio of the electrowetting display screen is increased, and the rising and falling curves of the waveform are closer.
The electrowetting printing ink driving voltage waveform is periodic waveform, the electrowetting printing ink driving voltage U of each waveform period is the same, each waveform period comprises a forward irregular half sine wave, and the voltage increases from an initial value to a peak value according to a preset change rate.
The electrowetting ink driving voltage U has longer voltage rise time than voltage fall time, can overcome the problem that ink droplets are easy to disperse in the prior art, and further improves the phenomenon that the difference between the rising stage and the falling stage of the aperture opening ratio is large.
After the electrowetting display screen is loaded with the driving voltage, the change of the ink is recorded through a high-speed camera, the aperture opening ratio test is carried out through aperture opening ratio test software, the aperture opening ratio test of the electronic paper is carried out through pictures, the prior MATLAB software can be used for loading pictures to carry out aperture opening ratio measurement and calculation, as shown in figure 5, a specific program code is placed at the end of a specific implementation method, and a calculation method and a device for the aperture opening ratio of the Python-based electronic paper with the publication number of 'CN 110033485A' can also be used for carrying out measurement and calculation.
Referring to fig. 4, the opening ratios of the ink dispersions photographed after driving the electrowetting display panel with the square wave voltage applied thereto were 55.42%, 51.28%, 32.78%, and 14.67%, respectively.
The electrowetting display screen is electrowetting printing ink electronic paper.
The aperture ratio is along the variation trend of a time function, under the condition of the same peak voltage, the response time of applying square wave voltage is shortest, but the ink dispersion condition is serious, the aperture ratio is lower, and the electrowetting display effect is seriously influenced; referring to fig. 6, although the ink dispersion situation is improved by using the step waveform voltage and the ink contraction state is relatively stable in the driving process, the aperture ratio is not significantly improved compared with the square wave voltage, and although the display effect is greatly improved, the aperture ratio does not have the difference from the aperture ratio when the screen is driven by the square wave under the same voltage; referring to fig. 7, the electrowetting ink driving voltage U is used to increase the aperture ratio by 3.14% compared to the square wave, and due to the waveform characteristics of the electrowetting ink driving voltage U, the rising and falling curves of the aperture ratio are more similar to those of the step wave and the square wave (see fig. 8), the size of the aperture ratio can be more accurately controlled, the shape of the ink movement can be more effectively controlled, the stability of the ink can be improved, and the maximization of the aperture ratio can be realized.
The aperture ratio test software code is as follows:
close all；
clear all；
clc；
obj＝VideoReader('D:\WAVE\SQUARE.mp4')；
numFrames＝obj.NumberOfFrames；
speed＝obj.NumberOfFrames；
firImag＝read(obj,1)；
imshow(firImag)；
h＝imrect；
pos＝getPosition(h)；
temp＝[]；
for i＝1:numFrames
for i＝195:258
frame＝read(obj,i)；
imag＝imcrop(frame,pos)；
imshow(imag)；
imwrite(imag,
strcat('H:\WAVE\DEMO\',num2str(i),'.jpg'),'jpg')；
Pic0＝imread(['H:\WAVE\DEMO\',num2str(i),'.jpg'])；
Level＝0.85；
Pic1＝im2bw(Pic0,Level)；
II＝1-Pic1；
imshow(II)；
S＝numel(II)；
s＝sum(sum(II))；
ratio＝s/S；
temp(i)＝1-ratio；
imwrite(imag,strcat('H:\WAVE\DEMO\',num2str(i),'.jpg'),'jpg')；
end
x＝1:numFrames；
y＝temp(i)；
plot(x,temp)；
axis([0 400 0 1])；
xlabel ('frame number');
ylabel ('aperture ratio');
title ('zone aperture ratio plot');
the above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.
Claims (4)
1. A driving method of electronic ink for display is characterized in that the method comprises the steps of calculating the driving voltage U of an electrowetting element, editing the driving voltage U of the electrowetting ink by adopting an editable function generator, obtaining the driving voltage waveform of the electrowetting ink by a high-voltage amplifier, and loading the driving voltage waveform of the electrowetting ink output by the high-voltage amplifier to an input port of an electrowetting display screen;
the electrowetting ink driving voltage U is as follows:
U=(10-4x2+1)（sin（x）+bx）。
2. the method of claim 1, wherein the electrowetting ink drive voltage waveform is a periodic waveform, the electrowetting ink drive voltage U is the same for each waveform period, and each waveform period comprises a positive irregular half sine wave that increases from an initial voltage value to a peak value at a predetermined rate of change.
3. The method of driving electronic ink for display according to claim 1 or 2, wherein the electrowetting ink driving voltage U has a longer step-up time than a step-down time.
4. The method of driving electronic ink for display according to claim 1, wherein the electrowetting display panel is an electrowetting ink electronic paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010045919.8A CN111192558A (en) | 2020-01-15 | 2020-01-15 | Driving method of electronic ink for display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010045919.8A CN111192558A (en) | 2020-01-15 | 2020-01-15 | Driving method of electronic ink for display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111192558A true CN111192558A (en) | 2020-05-22 |
Family
ID=70710814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010045919.8A Pending CN111192558A (en) | 2020-01-15 | 2020-01-15 | Driving method of electronic ink for display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111192558A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080024426A1 (en) * | 2006-07-31 | 2008-01-31 | Xerox Corporation | Apparatus and method for characterizing electrophoretic display mediums |
| US20120162548A1 (en) * | 2010-12-22 | 2012-06-28 | Kent State University | Method for electrophoresis in liquid crystals |
| CN107767821A (en) * | 2017-10-17 | 2018-03-06 | 华南师范大学 | A kind of fast refreshing method, system and device for suppressing ink splitting |
| CN108648701A (en) * | 2018-05-25 | 2018-10-12 | 福州大学 | A kind of method and device reducing the reflux of electrowetting Electronic Paper ink |
| CN109300437A (en) * | 2018-11-07 | 2019-02-01 | 深圳市国华光电科技有限公司 | A kind of electric moistening display part driving method and system |
| CN110085175A (en) * | 2019-04-22 | 2019-08-02 | 深圳市国华光电科技有限公司 | A kind of electrowetting ink driving method and relevant device |
-
2020
- 2020-01-15 CN CN202010045919.8A patent/CN111192558A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080024426A1 (en) * | 2006-07-31 | 2008-01-31 | Xerox Corporation | Apparatus and method for characterizing electrophoretic display mediums |
| US20120162548A1 (en) * | 2010-12-22 | 2012-06-28 | Kent State University | Method for electrophoresis in liquid crystals |
| CN107767821A (en) * | 2017-10-17 | 2018-03-06 | 华南师范大学 | A kind of fast refreshing method, system and device for suppressing ink splitting |
| CN108648701A (en) * | 2018-05-25 | 2018-10-12 | 福州大学 | A kind of method and device reducing the reflux of electrowetting Electronic Paper ink |
| CN109300437A (en) * | 2018-11-07 | 2019-02-01 | 深圳市国华光电科技有限公司 | A kind of electric moistening display part driving method and system |
| CN110085175A (en) * | 2019-04-22 | 2019-08-02 | 深圳市国华光电科技有限公司 | A kind of electrowetting ink driving method and relevant device |
Non-Patent Citations (3)
| Title |
|---|
| MAMPALLIL, D等: "Electrowetting-driven oscillating drops sandwiched between two substrates", 《 PHYSICAL REVIEW E 88 (5)》 * |
| 周国富等: "电泳电子纸驱动波形研究现状与前景", 《华南师范大学学报(自然科学版)》 * |
| 易子川等: "电润湿电子纸多级灰阶研究与设计", 《华南师范大学学报（自然科学版）》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9064462B2 (en) | Methods for compensating images and producing built-in compensating matrix set and e-paper display device thereof | |
| CN101840666B (en) | Electrophoretic display device, electronic device, and drive method for an electrophoretic display panel | |
| JP4862589B2 (en) | Electrophoretic display panel control device and electrophoretic display device | |
| KR101366924B1 (en) | Electrophoresis display device, method of driving electrophoresis display device, and electronic apparatus | |
| CN100565650C (en) | Drive the equipment of method and this method of use of LCD | |
| CN1265343C (en) | Method and device for driving liquid crystal display device | |
| US7839381B2 (en) | Driving method for an electrophoretic display with accurate greyscale and minimized average power consumption | |
| CN100417186C (en) | Method and apparatus for driving liquid crystal display | |
| US7796115B2 (en) | Scrolling function in an electrophoretic display device | |
| US20070273637A1 (en) | Rail-Stabilized Driving Scheme With Image Memory For An Electrophoretic Display | |
| CN104680984A (en) | Backlight Unit And Liquid Crystal Display Using The Same | |
| JP2007531000A (en) | "Rail stabilization" (reference state) drive method with image memory for electrophoretic display | |
| CN104952399B (en) | A kind of driving method for improving the rank gray scale display effect of electrophoretic display device (EPD) 16 | |
| KR20070003975A (en) | An electrophoretic display with reduced cross talk | |
| JP6813584B2 (en) | Methods and equipment for operating electro-optic displays in white mode | |
| CN110085175B (en) | Electrowetting ink driving method and related equipment | |
| CN105070254A (en) | Quick response method of multistage gray scale electrophoresis electronic paper | |
| CN105139811A (en) | Driving method for reducing ghosting artifact of electrophoretic display | |
| CN1580878A (en) | Method for driving liquid crystal panel, liquid crystal device and electronic apparatus | |
| CN1407529A (en) | Method and device for driving liquid crystal display device | |
| CN106251813A (en) | Electrowetting drive waveforms based on constant power generates method and system | |
| US20110216099A1 (en) | Driving method of electrophoretic display device, and controller | |
| CN111192558A (en) | Driving method of electronic ink for display | |
| US9202417B2 (en) | Driving method of electrophoretic display device, and controller | |
| JP2005351992A (en) | Method for driving particle transfer type display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200522 |