CN110196525B - Method for setting low-temperature power-off time sequence of black-white-red electronic paper module - Google Patents
Method for setting low-temperature power-off time sequence of black-white-red electronic paper module Download PDFInfo
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- CN110196525B CN110196525B CN201910437814.4A CN201910437814A CN110196525B CN 110196525 B CN110196525 B CN 110196525B CN 201910437814 A CN201910437814 A CN 201910437814A CN 110196525 B CN110196525 B CN 110196525B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/1685—Operation of cells; Circuit arrangements affecting the entire cell
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Abstract
The invention discloses a method for setting a low-temperature power-off time sequence of a black-white red electronic paper module, which comprises the black-white red electronic paper module and an external drive board capacitor, wherein the black-white red electronic paper module comprises black, white and red charged particles controlled to move up and down by an external electric field, and the external electric field comprises Vcom, Vsource, VGL and VGH voltage signals, and the method is characterized by comprising the following steps of: (1) the Vcom voltage signal is slowly discharged to GND through the external drive board capacitor; (2) instantly changing the Vsource voltage signal to GND; (3) slowly discharging a VGL voltage signal to GND through the external drive board capacitor; (4) instantly changing the VGH voltage signal to VCC; the technical scheme of the invention fundamentally solves the problem of 'springback' of the black-white-red electronic paper module under the low-temperature condition, and belongs to the initiative in the industry.
Description
Technical Field
The invention relates to the technical field of electronic paper, in particular to a method for setting a low-temperature power-off time sequence of a black-white-red electronic paper module.
Background
The electronic paper is a display screen made by utilizing electrophoretic display technology, and the effect of displaying images is achieved by continuously applying the waveform of driving voltage to each pixel point through a driving integrated circuit. The two-color electronic paper is characterized in that black and white charged particles are packaged in the same microcup structure, the three-color electronic paper is characterized in that black and white red or black and white yellow or black and white blue charged particles are packaged in the same microcup structure, the lifting movement of the black and white red particles with different charges is controlled by an externally applied positive and negative electric field, and the black and white red particles reach the top of a display screen to display the three-color display effect of black and white red. The sequence of voltages that cause electrophoretic motion of the particles is an electronic paper drive waveform. The electronic paper has a bistable characteristic, when the particles move to the top of the microcups, the image display can be kept without a voltage driving waveform, so that after the image is displayed on a screen, the voltage needs to be switched off, and the effect of saving power is achieved.
At present, the black-white-red electronic paper module has the same activity of black, white and red particles at normal temperature, VGH (Vgate _ high), Vsource, Vcom and VGL (Vgate _ low) can be directly powered off after the picture is updated, and the front and back red optical values are basically unchanged. However, in a low temperature environment with an external environment humidity less than 10 ℃, due to the inherent material structure characteristics of the black-white and red membrane, the activity of the red particles is much less than that of the black-white particles, so that when the voltage for driving the particles to move is changed instantaneously, the red particles moving to the top are reduced. The result displayed on the screen is a low optical red value, which appears to the naked eye as a layer of light white color on the red surface, commonly referred to as "spring back". In addition, the black-white and red electronic paper module is high in production process requirement and poor in consistency, different batches need to debug different driving waveforms and other reasons, so that the rebound phenomenon is different in degree, and the red display effect is poor.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the method for setting the low-temperature power-off time sequence of the black-white-red electronic paper module, which has high universality at low temperature and good optical display effects of the red L value and the red A value, so that the phenomenon of 'rebound' of the red pattern of the black-white-red electronic paper module at low temperature is eliminated.
A method for setting a low-temperature power-off time sequence of a black-white-red electronic paper module comprises the black-white-red electronic paper module and an external drive board capacitor, wherein the black-white-red electronic paper module comprises black, white and red charged particles which are controlled by an external electric field to move up and down, and the external electric field comprises Vcom, Vsource, VGL and VGH voltage signals, and is characterized in that the method for setting the low-temperature power-off time sequence comprises the following steps:
(1) the Vcom voltage signal is slowly discharged to GND through the external drive board capacitor;
(2) instantaneously changing the Vsource voltage signal to GND;
(3) slowly discharging a VGL voltage signal to GND through the external drive plate capacitance;
(4) the VGH voltage signal is instantaneously changed to VCC.
Here, VCC means an operating voltage of the driver IC.
Preferably, the Vcom voltage signal value is less than the VGL voltage signal value, and the Vsource voltage signal value is less than the VGH voltage signal value.
Preferably, the low temperature is in the range of 0 ℃ to 10 ℃.
In the prior art, in a normal temperature environment, after a black-and-white-red electronic paper module displays a picture and outputs all driving waveforms, a driving IC defaults to directly lower the voltage Vgate _ high to VCC, and the voltages Vsource, Vcom and VGL are directly lowered to GND (i.e. 0V, ground), so that after the driving waveforms are finished, the four voltages are instantly changed. However, when the power-off time sequence is in a low-temperature range of 0-10 ℃, the activity of the red particles is far less than that of the black and white particles, so that the red particles moving to the top are descended, and the phenomenon of 'rebound' is caused. In order to solve the problem, in the low-temperature range of 0-10 ℃, after the output of the driving waveform is finished, two voltages of Vcom and VGL are suspended in the air, so that the two voltages are discharged through a capacitor of an external driving board, the voltage is slowly reduced to GND, the voltage for driving red particles is not changed instantly, the red particles are kept not to move downwards at the top, and the phenomenon of 'rebound' is further avoided. The technical scheme of the invention fundamentally solves the problem of 'springback' of the black-white-red electronic paper module under the low-temperature condition, and belongs to the initiative in the industry.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of a conventional power-off timing diagram;
FIG. 2 is a schematic diagram of a low temperature power-off timing diagram;
FIG. 3 is a schematic diagram illustrating a process flow of testing the L and A values of red color;
FIG. 4 is a schematic diagram illustrating a red optical ghesting test procedure.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
A method for setting a low-temperature power-off time sequence of a black-white-red electronic paper module comprises the black-white-red electronic paper module and an external drive board capacitor, wherein the black-white-red electronic paper module comprises black, white and red charged particles which are controlled to move up and down by an external electric field, and the external electric field comprises voltage signals of Vcom, Vsource, VGL and VGH, and is characterized in that the method for setting the low-temperature power-off time sequence at 0-10 ℃ comprises the following steps:
(1) the Vcom voltage signal is slowly discharged to GND through the external drive board capacitor;
(2) instantaneously changing the Vsource voltage signal to GND;
(3) slowly discharging a VGL voltage signal to GND through the external drive plate capacitance;
(4) the VGH voltage signal is instantaneously changed to VCC.
To illustrate the effect of this embodiment, a conventional power-off sequence (fig. 1) and a low-temperature power-off sequence (fig. 2) are used to respectively test the red optical values of the same black-white-red electronic paper module at a low temperature of 0 ℃, where the red optical values include an L value and an a value, the test temperature is 0 ℃, and the test equipment is X-Rite i 1.
The testing steps are as shown in fig. 3, the electronic paper is firstly brushed into white in the test chart 1, then brushed into red in the test chart 2, and the red L value and the red A value are measured on the test point (I) in the test chart 2 by utilizing X-Rite i1, wherein the measurement results under 5 groups of conventional power-off time sequences are shown in the table I, and the measurement results under 5 groups of low-temperature power-off time sequences are shown in the table II.
The ghusting test is as shown in fig. 4, the electronic paper screen is brushed into three colors of black and white and red as shown in fig. 3, then is brushed into red as shown in fig. 2, and X-Rite i1 is used to measure red L value and red a value on three test points of (i) test point, (ii) test point and (iii) test point of fig. 2, so as to obtain L1 value, L2 value and L3 value, respectively, the ghusting value is the maximum value of the differences between L1, L2 and L3, i.e. ghusting [ | L1-L2|, | L1-L3|, | L2-L3| ], and 5 groups of test results are shown as ghusting in table one and table two.
The red optical standard at 0 ℃ is: l >27, A >39, Ghosting < 0.8. As can be seen from the table I, the L value and the Ghosting value of the electronic paper module under the conventional power-off time sequence test at 0 ℃ meet the standard, but the A value does not meet the standard, which is called the phenomenon of 'rebound'. As can be seen from the second table, at 0 ℃, the L value, the A value and the Ghosting value of the electronic paper module under the low-temperature power-off time sequence test all meet the standard, and the red color displayed by the electronic paper module does not generate the phenomenon of 'springback'.
TABLE I Red optical data from routine Power-off timing test
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | SPEC. | |
| L | 35.48 | 34.79 | 35.24 | 34.98 | 34.66 | >27 |
| A | 29.77 | 30.22 | 30.36 | 30.17 | 29.57 | >39 |
| Ghosting | 0.56 | 0.61 | 0.53 | 0.48 | 0.52 | <0.8 |
Second, red optical data obtained by low-temperature power-off time sequence test
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | SPEC. | |
| L | 28.07 | 28.45 | 28.92 | 27.89 | 28.31 | >27 |
| A | 40.46 | 40.91 | 41.08 | 40.67 | 40.44 | >39 |
| Ghosting | 0.38 | 0.47 | 0.35 | 0.43 | 0.54 | <0.8 |
The embodiment is only for the convenience of understanding the technical scheme of the invention, and does not limit the protection scope of the invention, and any simple modification, equivalent change and modification made to the above scheme without departing from the content of the technical scheme of the invention or the technical substance of the invention still belong to the protection scope of the invention.
Claims (3)
1. A method for setting a low-temperature power-off time sequence of a black-white-red electronic paper module comprises the black-white-red electronic paper module and an external drive board capacitor, wherein the black-white-red electronic paper module comprises black, white and red charged particles which are controlled to move up and down by an external electric field, and the external electric field comprises voltage signals of Vcom, Vsource, VGL and VGH, and is characterized in that the method for setting the low-temperature power-off time sequence comprises the following steps:
(1) the Vcom voltage signal is slowly discharged to GND through the external drive board capacitor;
(2) instantaneously changing the Vsource voltage signal to GND;
(3) slowly discharging a VGL voltage signal to GND through the external drive plate capacitance;
(4) the VGH voltage signal is instantaneously changed to VCC.
2. The method of claim 1, wherein the Vcom voltage signal is less than the VGL voltage signal, and the Vsource voltage signal is less than the VGH voltage signal.
3. The method for setting the low-temperature power-off timing sequence of the black-and-white electronic paper module according to claim 1, wherein the low temperature ranges from 0 ℃ to 10 ℃.
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Citations (6)
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| CN102376260A (en) * | 2010-08-27 | 2012-03-14 | 北京凡达讯科技有限公司 | Method for keeping stability of output voltage pulse of electronic paper |
| CN102486914A (en) * | 2010-12-01 | 2012-06-06 | 精工爱普生株式会社 | Driving method of electrophoretic display device, electrophoretic display device and electronic apparatus |
| JP2012118347A (en) * | 2010-12-01 | 2012-06-21 | Seiko Epson Corp | Driving method of electrophoretic display device, electrophoretic display device and electronic apparatus |
| CN104078009A (en) * | 2013-03-25 | 2014-10-01 | 北京京东方光电科技有限公司 | Electrophoretic display driving circuit, implementation method thereof and electrophoretic display device |
| CN109448615A (en) * | 2018-11-28 | 2019-03-08 | 江西兴泰科技有限公司 | A kind of automatic adjustment method of Electronic Paper drive waveforms |
| CN109599067A (en) * | 2018-12-24 | 2019-04-09 | 江西兴泰科技有限公司 | The adjustment method of Electronic Paper under a kind of low temperature environment |
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2019
- 2019-05-24 CN CN201910437814.4A patent/CN110196525B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102376260A (en) * | 2010-08-27 | 2012-03-14 | 北京凡达讯科技有限公司 | Method for keeping stability of output voltage pulse of electronic paper |
| CN102486914A (en) * | 2010-12-01 | 2012-06-06 | 精工爱普生株式会社 | Driving method of electrophoretic display device, electrophoretic display device and electronic apparatus |
| JP2012118347A (en) * | 2010-12-01 | 2012-06-21 | Seiko Epson Corp | Driving method of electrophoretic display device, electrophoretic display device and electronic apparatus |
| CN104078009A (en) * | 2013-03-25 | 2014-10-01 | 北京京东方光电科技有限公司 | Electrophoretic display driving circuit, implementation method thereof and electrophoretic display device |
| CN109448615A (en) * | 2018-11-28 | 2019-03-08 | 江西兴泰科技有限公司 | A kind of automatic adjustment method of Electronic Paper drive waveforms |
| CN109599067A (en) * | 2018-12-24 | 2019-04-09 | 江西兴泰科技有限公司 | The adjustment method of Electronic Paper under a kind of low temperature environment |
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