CN103680426B - A kind of driving method improving activation mode of electrophoretic display - Google Patents
A kind of driving method improving activation mode of electrophoretic display Download PDFInfo
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- 239000002245 particle Substances 0.000 description 9
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- 238000010586 diagram Methods 0.000 description 5
- 238000001962 electrophoresis Methods 0.000 description 4
- 239000003094 microcapsule Substances 0.000 description 3
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Abstract
The invention discloses a kind of driving method improving activation mode of electrophoretic display, belong to electrophoretic display panel field.Described method comprises: on the drive electrode of device display pixel, apply high-frequency pulse voltage to realize display driver, before described high-frequency pulse voltage is applied to the pulse voltage for writing new images.The present invention, by the driving method of described improvement activation mode of electrophoretic display, decreases the flicker of electrophoretic display device (EPD).
Description
Technical field
The present invention relates to electrophoretic display panel field, particularly a kind of driving method improving activation mode of electrophoretic display.
Background technology
Electrophoretic display has become important Electronic Paper display technique, and compared with other display techniques, have the advantage of super low-power consumption, therefore electrophoretic display technology is widely used.Two kinds of particles are had: black particle and white particle in microcapsules.White particle controls by negative charge, and black particle controls by positive charge.So, when pixel electrode provides negative voltage electrophoretic display device (EPD) display white, when positive voltage drives, then show black.Electrophoretic display device (EPD) needs an active matrix rear panel, in order to drive electrophoretic particles to realize the correct display of GTG, electrode applies suitable drive waveforms.Up to now, had much about the research of the drive waveforms of electrophoresis showed.
Generally directly apply a driving voltage control pixel according to changed final gray-scale value by the mode of question blank and show corresponding gray-scale value, but there is history dependent due to electro-optic displays, namely the impact of residual voltage etc. is had, therefore being difficult to by directly inquiring about tabledriven mode the accurate control realizing gray scale, causing certain error.In gray-scale Control process, if a certain pixel can not get back to extreme optical state (namely black or white) for a long time, then error can be increasing, in addition, when applying driving voltage to gray-scale Control, being necessary to keep DC balance, otherwise electrode and display medium can be damaged.
At present, conventional ADS driving waveform comprises four-stage: wipe original image, be re-set as black state, be scavenged into white states and write new images.This process only can reduce ghost image a little, but effect is not fine and can produces flicker.As shown in Figure 1, conventional ADS driving waveform drives process schematic as shown in Figure 2 to conventional ADS driving waveform schematic diagram.According to previous fourth stage, the first stage adopts the voltage reaching DC balance.Apply opposite polarity driving voltage to wipe present image, duration t
ewith drove in last time circulate in drive image to be the same to current state.Second and the phase III be used for jihuokeli.At the end of the first stage; electrophoretic display device (EPD) should be written to a unified white states; but actual conditions are the reasons due to material itself; it not all completely same action under corresponding predetermined voltage of whole electrophoretic particle; even apply predetermined voltage; even also have the position fully not moving to expection particulate or temporarily move preset distance but due to the convection current of dispersion liquid sedimentation or the particulate that floats again; therefore; electrophoretic display device (EPD) may show the unequal image of ghost image, image retention or gray scale at the end of drive waveforms, as shown in Figure 3.Fourth stage writes new image, duration t
w, due to the impact by front three phases, new image has ghost image, has a negative impact to the comfortable reading of human eye.
In order to address this problem, scientists proposes certain methods.One method is used for upgrading display four kinds of screen updates patterns, and this renewal display is as required, upgrades the image document in electrophoresis showed, the flashing times that it can improve renewal speed and reduce in certain special cases.But this method only changes screen-refresh pattern, from start to finish flicker can not be reduced.
Summary of the invention
Embodiments provide a kind of driving method improving activation mode of electrophoretic display, to reduce the flicker of electrophoretic display device (EPD).
Embodiments provide a kind of driving method improving activation mode of electrophoretic display, the drive electrode of device display pixel applies high-frequency pulse voltage to realize display driver, before described high-frequency pulse voltage is applied to the pulse voltage for writing new images.
Further, described high-frequency pulse voltage is the pulse voltage higher than 25Hz.
Further, described high-frequency pulse voltage is square-wave voltage.
Further, described driving method adopts black grey scale to be reference gray level.
Further, also comprise before described applying high-frequency pulse voltage: the reset voltage pulse applying to observe DC balance.
Further, the described reset voltage pulse observing DC balance comprises the negative voltage of very first time length and the positive voltage of the second time span.
Further, described very first time length is T-t
1, described T is that blank screen applies voltage required time, described t to white screen
1for write original image applies voltage required time.
Further, described second time span is T, and described T is that blank screen applies voltage required time to white screen.
A kind of waveform generator, described waveform generator periodically produces pulse voltage waveform, described pulse voltage waveform comprise the drive electrode for driving element display pixel high-frequency pulse voltage, for writing the pulse voltage of new images and observing the reset voltage pulse of DC balance, before in sequential, described high-frequency pulse voltage occurs in the described pulse voltage for writing new images, before described reset voltage pulse occurs in described high-frequency pulse voltage.
Further, described high-frequency pulse voltage is the pulse voltage higher than 25Hz; Described second time span is T, and described high-frequency pulse voltage is square-wave voltage.
The beneficial effect that technical scheme provided by the invention is brought is:
From the invention described above embodiment, realize display driver owing to applying high-frequency impulse, the frequency of HF voltage is greater than the frequency that human eye can be perceived, and decreases the flicker of electrophoretic display device (EPD).
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is conventional ADS driving waveform schematic diagram;
Fig. 2 is that conventional ADS driving waveform drives process schematic;
Fig. 3 is ghost image schematic diagram;
Fig. 4 is first embodiment of the invention drive waveforms schematic diagram;
Fig. 5 is that first embodiment of the invention drive waveforms drives process schematic;
Fig. 6 is second embodiment of the invention drive waveforms schematic diagram;
Fig. 7 is that second embodiment of the invention drive waveforms drives process schematic.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
The embodiment of the present invention one provides a kind of driving method improving activation mode of electrophoretic display, the drive electrode of device display pixel applies high-frequency pulse voltage to realize display driver, before described high-frequency pulse voltage is applied to the pulse voltage for writing new images.
The drive waveforms of high-frequency pulse voltage is see Fig. 4, after write original image, the drive electrode of device display pixel applies the particle in high-frequency pulse voltage activation microcapsules, and described high-frequency pulse voltage is the pulse voltage higher than 25Hz, and described high-frequency pulse voltage can be square-wave voltage.After applying high-frequency pulse voltage, apply negative voltage write new images.
The drive waveforms of high-frequency pulse voltage drives process see Fig. 5, and after applying high-frequency pulse voltage, screen is blank screen.The present invention adopts black grey scale to be reference gray level, and the pulse voltage forth screen being namely applied for writing new images is blank screen.When adopting black grey scale to be reference gray level, write voltage that new images applies is negative voltage.In the present embodiment, with level Four greyscale drive waveforms as an example, but the method for designing of drive waveforms is applicable to multi-stage grey scale drive waveforms herein.
The present invention adopts black grey scale to be reference gray level.If take white GTG as reference, white states may be dimmed along with driving high-frequency pulse voltage, the reference gray level level that electrophoresis showed may be lost.So in the present invention, black grey scale is used as reference gray level, is negative voltage for writing voltage that new images applies.
The present embodiment realizes display driver by applying high-frequency impulse, and the frequency of HF voltage is greater than the frequency that human eye can be perceived, and decreases the flicker of electrophoretic display device (EPD).
Embodiment two
In conjunction with the embodiment of the present invention one, before applying high-frequency pulse voltage, apply the reset voltage pulse observing DC balance, as shown in Figure 6.
After write original image, apply the reset voltage pulse observing DC balance, the described reset voltage pulse observing DC balance comprises the negative voltage of very first time length and the positive voltage of the second time span.
Described very first time length is T-t
1; Described T is that blank screen applies voltage required time, t to white screen
1for write original image applies voltage required time.Such as, it is 120ms that blank screen applies voltage required time to white screen, and it is 80ms that write original image applies voltage required time, then very first time length is 40ms, and reset voltage pulse comprises the negative voltage that very first time length is 40ms.
See Fig. 7, after applying the negative voltage of very first time length, screen is white screen.
Described second time span is T; Described T is that blank screen applies voltage required time to white screen.Such as, it is 120ms that blank screen applies voltage required time to white screen, then the second time span is 120ms, and reset voltage pulse comprises the positive voltage that the second time span is 120ms.
See Fig. 7, after applying the positive voltage of the second time span, screen is blank screen.
Therefore, be 120ms when blank screen applies voltage required time to white screen, it is 80ms that write original image applies voltage required time, then reset voltage pulse comprises negative voltage that very first time length is 40ms and the second time span is the positive voltage of 120ms.
After applying the reset voltage pulse in accordance with DC balance, the drive electrode of device display pixel applies high-frequency pulse voltage to realize display driver, before described high-frequency pulse voltage is applied to the pulse voltage for writing new images.
See Fig. 6, after applying the reset voltage pulse in accordance with DC balance, the drive electrode of device display pixel applies the particle in high-frequency pulse voltage activation microcapsules, and described high-frequency pulse voltage is the pulse voltage higher than 25Hz, and described high-frequency pulse voltage can be square-wave voltage.After applying high-frequency pulse voltage, apply negative voltage write new images.
See Fig. 7, after applying high-frequency pulse voltage, screen is blank screen.The present invention adopts black grey scale to be reference gray level, and the pulse voltage forth screen namely applying write new images is blank screen.When adopting black grey scale to be reference gray level, write voltage that new images applies is negative voltage.In the present embodiment, with level Four greyscale drive waveforms as an example, but the method for designing of drive waveforms is applicable to multi-stage grey scale drive waveforms herein.
The present invention adopts black grey scale to be reference gray level.If take white GTG as reference, white states may be dimmed along with driving high-frequency pulse voltage, the reference gray level level that electrophoresis showed may be lost.So in the present invention, black grey scale is used as reference gray level, and write voltage that new images applies is negative voltage.
As shown in Figure 6, the pulse of image is write for the pulse of write original image before reset voltage pulse and high-frequency pulse voltage, write the pulse of image for the pulse of write new images after reset voltage pulse and high-frequency pulse voltage, wherein, the write original image burst length is t
1.
The embodiment of the present invention also provides a kind of waveform generator, described waveform generator periodically produces pulse voltage waveform, described pulse voltage waveform comprise the drive electrode for driving element display pixel high-frequency pulse voltage, for writing the pulse voltage of new images and observing the reset voltage pulse of DC balance, before in sequential, described high-frequency pulse voltage occurs in the described pulse voltage for writing new images, before described reset voltage pulse occurs in described high-frequency pulse voltage.As shown in Figure 6, be high-frequency pulse voltage before the pulse voltage of write new images, be reset voltage pulse before high-frequency pulse voltage to described pulse voltage waveform.
In the embodiment of above-mentioned waveform generator, high-frequency pulse voltage is the pulse voltage higher than 25Hz, and the second time span is T, and high-frequency pulse voltage is square-wave voltage, and high-frequency electrical pulses corrugating is see Fig. 6.
The present embodiment realizes display driver by applying high-frequency impulse, the frequency of HF voltage is greater than the frequency that human eye can be perceived, decrease the flicker of electrophoretic display device (EPD), before applying high-frequency impulse, apply the reset voltage pulse observing DC balance simultaneously, decrease the phenomenon of ghost image.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. improving a driving method for activation mode of electrophoretic display, it is characterized in that, the drive electrode of device display pixel applying high-frequency pulse voltage to realize display driver, before described high-frequency pulse voltage is applied to the pulse voltage for writing new images;
Described driving method adopts black grey scale to be reference gray level.
2. method according to claim 1, is characterized in that, described high-frequency pulse voltage is the pulse voltage higher than 25Hz.
3. method according to claim 1, is characterized in that, described high-frequency pulse voltage is square-wave voltage.
4. method according to claim 1, is characterized in that, also comprises before described applying high-frequency pulse voltage: apply the reset voltage pulse observing DC balance.
5. method according to claim 4, is characterized in that, the described reset voltage pulse observing DC balance comprises the negative voltage of very first time length and the positive voltage of the second time span.
6. method according to claim 5, is characterized in that, described very first time length is T-t
1, described T is that blank screen applies voltage required time, described t to white screen
1for write original image applies voltage required time.
7. method according to claim 5, is characterized in that, described second time span is T, and described T is that blank screen applies voltage required time to white screen.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015017624A1 (en) * | 2013-07-31 | 2015-02-05 | E Ink Corporation | Methods for driving electro-optic displays |
| CA2967038C (en) * | 2014-11-17 | 2019-08-20 | E Ink California, Llc | Color display device |
| CN104978934B (en) * | 2015-06-24 | 2018-03-09 | 深圳市国华光电科技有限公司 | The flicker reduction method and electrophoretic display device (EPD) of electrophoretic display device (EPD) image switching |
| CN105118443B (en) * | 2015-06-25 | 2017-10-13 | 华南师范大学 | A kind of electro phoretic display device driving method and electro phoretic display device |
| CN105070254A (en) * | 2015-08-31 | 2015-11-18 | 深圳市国华光电科技有限公司 | Quick response method of multistage gray scale electrophoresis electronic paper |
| CN105139811B (en) | 2015-09-30 | 2017-12-22 | 深圳市国华光电科技有限公司 | A kind of electrophoretic display device (EPD) weakens the driving method of ghost |
| CN105575336B (en) * | 2016-01-15 | 2018-04-24 | 深圳市国华光电研究院 | A kind of electro phoretic display device drive waveforms self-generating method |
| CN106601195B (en) * | 2016-12-29 | 2019-03-26 | 深圳市国华光电科技有限公司 | A kind of method and apparatus for eliminating electrophoretic electronic paper image boundary |
| CN107342057A (en) | 2017-08-09 | 2017-11-10 | 京东方科技集团股份有限公司 | For driving the method, apparatus and display device of electrophoretic display panel |
| CN110890072A (en) * | 2019-12-04 | 2020-03-17 | 中山大学 | Self-powered electronic paper drive circuit and electronic paper display equipment |
| CN113539191B (en) * | 2021-07-07 | 2022-07-26 | 江西兴泰科技有限公司 | Voltage driving waveform debugging method for reducing power consumption of electronic paper |
| CN113707100B (en) * | 2021-07-20 | 2023-04-18 | 中山职业技术学院 | Driving method for eliminating color ghost of three-color electrophoretic electronic paper |
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Address after: 518110 Guangdong Province, Shenzhen city Longhua District Guanlan community tourism Da BU Xiang Road No. 1301-1 7 floor 703-1 Applicant after: SHENZHEN GUOHUA OPTOELECTRONICS Co.,Ltd. Applicant after: SOUTH CHINA NORMAL University Applicant after: ACADEMY OF SHENZHEN GUOHUA OPTOELECTRONICS Address before: 518110 Guangdong Province, Shenzhen city Longhua District Guanlan community tourism Da BU Xiang Road No. 1301-1 7 floor 703-1 Applicant before: SHENZHEN GUOHUA OPTOELECTRONICS Co.,Ltd. Applicant before: SOUTH CHINA NORMAL University Applicant before: SHENZHEN GUOHUA OPTOELECTRONICS INSTITUTE |
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Effective date of registration: 20240613 Address after: 518000 b715, Yinxing technology building, 1301 Guanlan community sightseeing Road, Guanlan street, Longhua District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN GUOHUA OPTOELECTRONICS Co.,Ltd. Country or region after: China Address before: 518110 703-1, 7th floor, No. 1301-1, sightseeing Road, dabuxiang community, Longhua New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN GUOHUA OPTOELECTRONICS Co.,Ltd. Country or region before: China Patentee before: SOUTH CHINA NORMAL University Patentee before: ACADEMY OF SHENZHEN GUOHUA OPTOELECTRONICS |