CN103680426A - Driving method for improving activation mode of electrophoretic display - Google Patents
Driving method for improving activation mode of electrophoretic display Download PDFInfo
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Abstract
The invention discloses a driving method for improving the activation mode of an electrophoretic display, and belongs to the field of electrophoretic displays. The method comprises: applying high-frequency pulse voltage to a driving electrode of a device displaying pixel to achieve display driving, wherein the high-frequency pulse voltage is applied in the front of pulse voltage for writing in a new image. According to the driving method for improving the activation mode of the electrophoretic display, the flickering of the electrophoretic display is reduced.
Description
Technical field
The present invention relates to electrophoretic display panel field, particularly a kind of driving method that improves electrophoretic display device (EPD) enable mode.
Background technology
Electrophoretic display has become important Electronic Paper display technique, compares with other display techniques, have advantages of super low-power consumption, so electrophoretic display technology is widely used.In microcapsules, there are two kinds of particles: black particle and white particle.White particle is controlled by negative charge, and black particle is controlled by positive charge.So when pixel electrode provides negative voltage electrophoretic display device (EPD) display white, positive voltage shows black while driving.Electrophoretic display device (EPD) needs an active matrix backboard, in order to drive electrophoretic particles to realize the correct demonstration of GTG, applies suitable drive waveforms on electrode.Up to now, there is the research of the drive waveforms of a lot of relevant electrophoresis showed.
The general mode by question blank directly applies a driving voltage control pixel according to changed final gray-scale value and shows corresponding gray-scale value, yet because electro-optic displays has history dependent, have the impact of residual voltage etc., therefore by the tabledriven mode of direct inquiry, be difficult to realize the accurate control of gray scale, cause certain error.In gray-scale Control process, if a certain pixel can not be got back to extreme optical state (being black or white) for a long time, error can be increasing, in addition, when gray-scale Control is applied to driving voltage, be necessary to keep DC balance, otherwise can damage electrode and display medium.
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 diagram as shown in Figure 2 to conventional ADS driving waveform schematic diagram.According to previous fourth stage, the first stage adopts the voltage that reaches DC balance.Apply opposite polarity driving voltage and wipe present image, duration t
ein driving circulation with in last time, driving image is the same to current state.Second and the phase III for jihuokeli.When the first stage finishes; electrophoretic display device (EPD) should be written to a unified white states; but actual conditions are the reasons due to material itself; not all completely same action under corresponding predetermined voltage of whole electrophoretic particle; even apply predetermined voltage; even also have the particulate of the position that does not fully move to expection or temporarily moved 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 when drive waveforms finishes, as shown in Figure 3.Fourth stage writes new image, duration t
w, owing to being subject to the impact of front three phases, new image has ghost image, and to human eye, comfortable reading has a negative impact.
In order to address this problem, scientists has proposed certain methods.Method be by four kinds of screen updates patterns for upgrading a demonstration, it is as required that this renewal shows, is updated in the image document of electrophoresis showed, it can improve renewal speed and reduce the flicker number of times under some particular case.Yet this method is only changed screen-refresh pattern, can not from start to finish reduce flicker.
Summary of the invention
The embodiment of the present invention provides a kind of driving method that improves electrophoretic display device (EPD) enable mode, to reduce the flicker of electrophoretic display device (EPD).
The embodiment of the present invention provides a kind of driving method that improves electrophoretic display device (EPD) enable mode, on the drive electrode of device display pixel, apply high-frequency pulse voltage to realize display driver, described high-frequency pulse voltage is applied to for before writing the pulse voltage of 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 employing black grey scale is reference gray level.
Further, before applying high-frequency pulse voltage described in, also comprise: apply the reset voltage pulse in accordance with DC balance.
Further, the described reset voltage pulse of 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 to white screen applies voltage required time, described t
1for writing original image, apply voltage required time.
Further, described the second time span is T, and described T is that blank screen to white screen applies voltage required time.
A kind of waveform generator, described waveform generator periodically produces pulse voltage waveform, described pulse voltage waveform comprises high-frequency pulse voltage for the drive electrode of driving element display pixel, for writing the pulse voltage of new images and the reset voltage pulse of observing DC balance, the above high-frequency pulse voltage of sequential occurs in described for before writing the pulse voltage of 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 the 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, owing to applying high-frequency impulse, realize display driver, the frequency of HF voltage is greater than the frequency that human eye can be perceived, and has reduced 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 of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is conventional ADS driving waveform schematic diagram;
Fig. 2 is that conventional ADS driving waveform drives process schematic diagram;
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 diagram;
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 diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment mono-
The embodiment of the present invention one provides a kind of driving method that improves electrophoretic display device (EPD) enable mode, on the drive electrode of device display pixel, apply high-frequency pulse voltage to realize display driver, described high-frequency pulse voltage is applied to for before writing the pulse voltage of new images.
The drive waveforms of high-frequency pulse voltage is referring to Fig. 4, after writing original image, on the drive electrode of device display pixel, apply high-frequency pulse voltage and activate the particle in microcapsules, 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 and write new images.
The drive waveforms of high-frequency pulse voltage drives process referring to Fig. 5, and after applying high-frequency pulse voltage, screen is blank screen.It is reference gray level that the present invention adopts black grey scale, and applying for writing the pulse voltage forth screen of new images is blank screen.While adopting black grey scale to be reference gray level, writing voltage that new images applies is negative voltage.In the present embodiment, use level Four gray scale drive waveforms as an example, but the method for designing of drive waveforms is applicable to multi-stage grey scale drive waveforms herein.
It is reference gray level that the present invention adopts black grey scale.If take white GTG as reference, white states may be along with driving a high-frequency pulse voltage dimmed, the reference gray level level that electrophoresis showed may be lost.So in the present invention, black grey scale, as reference gray level, is negative voltage for writing voltage that new images applies.
The present embodiment is realized 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 has reduced the flicker of electrophoretic display device (EPD).
Embodiment bis-
In conjunction with the embodiment of the present invention one, before applying high-frequency pulse voltage, apply the reset voltage pulse in accordance with DC balance, as shown in Figure 6.
After writing original image, apply the reset voltage pulse in accordance with DC balance, the described reset voltage pulse of 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 to white screen applies voltage required time, t
1for writing original image, apply voltage required time.For example, it is 120ms that blank screen applies voltage required time to white screen, and writing original image, to apply voltage required time be 80ms, and very first time length is 40ms, and reset voltage pulse comprises that very first time length is the negative voltage of 40ms.
Referring to Fig. 7, apply after the negative voltage of very first time length, screen is white screen.
Described the second time span is T; Described T is that blank screen to white screen applies voltage required time.For example, it is 120ms that blank screen applies voltage required time to white screen, and the second time span is 120ms, and reset voltage pulse comprises that the second time span is the positive voltage of 120ms.
Referring to Fig. 7, apply after the positive voltage of the second time span, screen is blank screen.
Therefore, when blank screen applies voltage required time to white screen, be 120ms, writing original image, to apply voltage required time be 80ms, reset voltage pulse comprises that very first time length is the negative voltage of 40ms and the positive voltage that the second time span is 120ms.
Apply and observe after the reset voltage pulse of DC balance, apply high-frequency pulse voltage to realize display driver on the drive electrode of device display pixel, described high-frequency pulse voltage is applied to for before writing the pulse voltage of new images.
Referring to Fig. 6, after the reset voltage pulse applying in accordance with DC balance, on the drive electrode of device display pixel, apply high-frequency pulse voltage and activate the particle in microcapsules, 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 and write new images.
Referring to Fig. 7, after applying high-frequency pulse voltage, screen is blank screen.It is reference gray level that the present invention adopts black grey scale, and applying the pulse voltage forth screen that writes new images is blank screen.While adopting black grey scale to be reference gray level, writing voltage that new images applies is negative voltage.In the present embodiment, use level Four gray scale drive waveforms as an example, but the method for designing of drive waveforms is to be applicable to multi-stage grey scale drive waveforms herein.
It is reference gray level that the present invention adopts black grey scale.If take white GTG as reference, white states may be along with driving a high-frequency pulse voltage dimmed, the reference gray level level that electrophoresis showed may be lost.So in the present invention, black grey scale is as reference gray level, writing voltage that new images applies is negative voltage.
As shown in Figure 6, the pulse that writes image before reset voltage pulse and high-frequency pulse voltage is for writing original image pulse, the pulse that writes image after reset voltage pulse and high-frequency pulse voltage is for writing new images pulse, and wherein, writing the 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 comprises high-frequency pulse voltage for the drive electrode of driving element display pixel, for writing the pulse voltage of new images and the reset voltage pulse of observing DC balance, the above high-frequency pulse voltage of sequential occurs in described for before writing the pulse voltage of new images, before described reset voltage pulse occurs in described high-frequency pulse voltage.As shown in Figure 6, the pulse voltage that writes new images is high-frequency pulse voltage to described pulse voltage waveform before, before high-frequency pulse voltage, is reset voltage pulse.
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 referring to Fig. 6.
The present embodiment is realized display driver by applying high-frequency impulse, the frequency of HF voltage is greater than the frequency that human eye can be perceived, reduced the flicker of electrophoretic display device (EPD), before applying high-frequency impulse, applied the reset voltage pulse in accordance with DC balance, reduced the phenomenon of ghost image simultaneously.
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, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a driving method that improves electrophoretic display device (EPD) enable mode, is characterized in that, applies high-frequency pulse voltage to realize display driver on the drive electrode of device display pixel, and described high-frequency pulse voltage is applied to for before writing the pulse voltage of new images.
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, it is reference gray level that described driving method adopts black grey scale.
5. method according to claim 4, is characterized in that, described in apply before high-frequency pulse voltage and also comprise: apply the reset voltage pulse in accordance with DC balance.
6. method according to claim 5, is characterized in that, the described reset voltage pulse of observing DC balance comprises the negative voltage of very first time length and the positive voltage of the second time span.
7. method according to claim 6, is characterized in that, described very first time length is T-t
1, described T is that blank screen to white screen applies voltage required time, described t
1for writing original image, apply voltage required time.
8. method according to claim 6, is characterized in that, described the second time span is T, and described T is that blank screen to white screen applies voltage required time.
9. a waveform generator, it is characterized in that, described waveform generator periodically produces pulse voltage waveform, described pulse voltage waveform comprises high-frequency pulse voltage for the drive electrode of driving element display pixel, for writing the pulse voltage of new images and the reset voltage pulse of observing DC balance, the above high-frequency pulse voltage of sequential occurs in described for before writing the pulse voltage of new images, before the above reset voltage pulse of sequential occurs in described high-frequency pulse voltage.
10. waveform generator according to claim 9, is characterized in that, described high-frequency pulse voltage is the pulse voltage higher than 25Hz, and described the second time span is T, and described high-frequency pulse voltage is square-wave voltage.
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| CN105118443A (en) * | 2015-06-25 | 2015-12-02 | 华南师范大学 | Electrophoresis display device driving method and electrophoresis display device |
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| WO2017054435A1 (en) * | 2015-09-30 | 2017-04-06 | 深圳市国华光电科技有限公司 | Driving method for reducing ghosting artifact of electrophoretic display |
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| 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 |
| CN106601195A (en) * | 2016-12-29 | 2017-04-26 | 深圳市国华光电科技有限公司 | Method and device for eliminating image boundary of electrophoresis electronic paper |
| US10755649B2 (en) | 2017-08-09 | 2020-08-25 | Beijing Boe Optoelectronics Technology Co., Ltd. | Method and apparatus for driving electrophoretic display panel, and display device |
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