CN109300437B - Electrowetting display device driving method and system - Google Patents
Electrowetting display device driving method and system Download PDFInfo
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- 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
- G09G3/344—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 particles moving in a fluid or in a gas, e.g. electrophoretic devices
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Abstract
The invention discloses a driving method and a system of an electrowetting display device, which are used for carrying out sharp pulse waveform driving on the electrowetting display device according to driving voltage after the driving voltage of the electrowetting display device is obtained, overcoming the technical problem that pixels of the electrowetting display device are easy to be broken down along with the increase of the driving voltage in the prior art, and effectively avoiding the situation that the pixels of the electrowetting display device are broken down.
Description
Technical Field
The invention relates to the field of electrowetting, in particular to a driving method and a driving system of an electrowetting display device.
Background
In recent years, a reflective display device has attracted attention, and one of the most attractive applications is an electrowetting (electrowetting) display device, which performs display based on control of a polar liquid in an energized state, and thus has a faster response speed and can also achieve high brightness, high contrast, and low power consumption, compared to other reflective display devices. There is still much room for improvement in how to display pictures and even video on electrowetting devices.
In the prior art, a Thin Film Transistor (TFT) is used to control an electrowetting display unit, and then a software and hardware control voltage is used to realize gray scale display. Similar to a liquid crystal display, after a thin film transistor is integrated on each pixel point on an electrowetting device, the switching condition of each pixel point is controlled in a row-column scanning mode, and then the output voltage is controlled by an algorithm, so that the display brightness of each unit is different, and the gray scale is realized. A known electrowetting display comprises a plurality of pixel cells, fig. 1 is a cross-sectional view of a single pixel cell in the electrowetting display, as shown in fig. 1, the pixel cell comprising: a first substrate 8, a second substrate 1, a first electrode 7, a second electrode 2, an insulating layer 3, a pixel wall 4, a first fluid 5, and a second fluid 6; the second electrode 2 is arranged on the second substrate 1, the insulating layer 3 is arranged on the second electrode 2, the pixel walls 4 are arranged on the insulating layer 3, the first fluid 5 is filled between every two adjacent pixel walls, the first fluid 5 is light-tight and is insoluble with the second fluid 6, the second fluid 6 is light-transmitting and has conductivity or polarity, and the second fluid 6 is filled between the first fluid 5 and the first electrode 7. Wherein the first fluid 5 is preferably an ink and the second fluid 6 is preferably water. The electrowetting electronic paper realizes the display switch based on the change of the contact angle of two fluids, and the electrowetting contact angle has a hysteresis phenomenon, namely the change of the contact angle has three stages. The first stage is that when the pixel voltage is applied, the electrowetting contact angle is not changed greatly, and the optical change of the display, namely the threshold voltage of the contact angle, cannot be observed visually by human eyes; in the second stage, along with the increase of voltage, the electrowetting contact angle changes obviously, and obvious optical change can be observed; the third stage is that when the voltage is continuously increased, the electrowetting contact angle is basically not changed and is in a saturated state, and obvious optical change is not observed at the moment; in addition, part of the ink is not controlled by the driving voltage, the stretching performance of the oil film loses reversibility under the driving control of the voltage, and the electrowetting ink pixel is broken down.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a driving method and system for an electrowetting display device, which can effectively prevent the pixels of the electrowetting display device from being broken down.
The technical scheme adopted by the invention is as follows: an electrowetting display device driving method comprising the steps of:
a driving voltage obtaining step of obtaining a driving voltage of the electrowetting display device;
and a driving step of performing spike waveform driving on the electrowetting display device according to the driving voltage.
Further, the driving step includes:
a drive waveform obtaining step of obtaining a drive square wave based on the drive voltage,
and a differential driving step of inputting the driving square wave into a differential circuit to output a sharp pulse waveform to drive the electrowetting display device.
Further, the time constant of the differentiating circuit is less than or equal to the input pulse time width of 1/10.
Further, the electrowetting display device driving method further comprises:
a driving voltage-aperture ratio data acquisition step, in which different driving voltages are used for carrying out spike pulse waveform driving on the electrowetting display device so as to acquire the aperture ratio of the electrowetting display device, and a plurality of groups of driving voltage-aperture ratio data are obtained;
a fitting step, namely obtaining a fitting curve of the driving voltage and the aperture ratio of the electrowetting display device according to the plurality of groups of driving voltage-aperture ratio data;
an optimal driving step, namely acquiring a point with the maximum opening rate acceleration according to the fitting curve; and carrying out sharp pulse waveform driving on the electrowetting display device according to the driving voltage corresponding to the point with the maximum opening rate acceleration.
Further, the driving voltage-aperture ratio data obtaining step includes:
and acquiring multiple sets of driving voltage-aperture ratio data of the electrowetting display device in a non-polar fluid contraction stage along with the increase of the driving voltage or multiple sets of driving voltage-aperture ratio data of the electrowetting display device in a non-polar fluid expansion stage along with the decrease of the driving voltage.
The other technical scheme adopted by the invention is as follows: an electrowetting display device driving system comprising:
a driving voltage obtaining unit for obtaining a driving voltage of the electrowetting display device;
and the driving unit is used for carrying out sharp pulse waveform driving on the electrowetting display device according to the driving voltage.
Further, the driving unit includes
A driving waveform obtaining module for obtaining a driving square wave according to the driving voltage,
and the differential driving module is used for inputting the driving square wave into a differential circuit to output a sharp pulse waveform to drive the electrowetting display device.
Furthermore, the driving waveform obtaining module comprises an editable waveform function generator and a high-voltage amplifier, wherein the output end of the editable waveform function generator is connected with the input end of the high-voltage amplifier, and the output end of the high-voltage amplifier is connected with the input end of the differential driving module.
Further, the electrowetting display device driving system further comprises:
the driving voltage-aperture ratio data acquisition unit is used for carrying out spike pulse waveform driving on the electrowetting display device by using different driving voltages so as to acquire the aperture ratio of the electrowetting display device and obtain a plurality of groups of driving voltage-aperture ratio data;
the fitting unit is used for acquiring a fitting curve of the driving voltage and the aperture ratio of the electrowetting display device according to the plurality of groups of driving voltage-aperture ratio data;
the optimal driving unit is used for acquiring a point with the maximum opening rate acceleration according to the fitted curve; and carrying out sharp pulse waveform driving on the electrowetting display device according to the driving voltage corresponding to the point with the maximum opening rate acceleration.
The invention has the beneficial effects that:
according to the driving method and system of the electrowetting display device, after the driving voltage of the electrowetting display device is obtained, the electrowetting display device is subjected to spike pulse waveform driving according to the driving voltage, the technical problem that pixels of the electrowetting display device are easy to break down along with the increase of the driving voltage in the prior art is solved, and the situation that the pixels of the electrowetting display device are broken down can be effectively avoided.
Drawings
The following further describes embodiments of the present invention with reference to the accompanying drawings:
FIG. 1 is a cross-sectional view of a single pixel cell in an electrowetting display;
fig. 2 is a schematic diagram of an embodiment of a differentiating circuit of a driving method of an electrowetting display device in the present invention;
FIG. 3 is a schematic diagram of an embodiment of a driving system for an electrowetting display device in accordance with the present invention;
FIG. 4 is a schematic diagram of a fitted curve of an embodiment of a driving method of an electrowetting display device in accordance with the invention;
FIG. 5 is a graph showing the variation of the aperture ratio of an electrowetting display panel under a high-voltage driving square wave in a conventional driving scheme;
FIG. 6 is a diagram illustrating a display screen switch state according to an embodiment of a method for driving an electrowetting display device in accordance with the present invention;
fig. 7 is a graph showing a variation of aperture ratio of a pixel according to an embodiment of a driving method of an electrowetting display device.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
An electrowetting display device driving method comprising the steps of:
a driving voltage obtaining step of obtaining a driving voltage of the electrowetting display device;
and a driving step of performing spike waveform driving on the electrowetting display device according to the driving voltage.
The electrowetting display device is driven by the sharp pulse waveform, the technical problem that pixels of the electrowetting display device are easy to break down along with the increase of driving voltage in the prior art is solved, and the situation that the pixels of the electrowetting display device are broken down can be effectively avoided.
As a further improvement of the technical solution, the driving step includes:
a driving waveform obtaining step, obtaining a driving waveform according to the driving voltage, wherein in this embodiment, the driving waveform is a driving square wave.
And a differential driving step of inputting the driving square wave into a differential circuit to output a sharp pulse waveform to drive the electrowetting display device.
In the electrowetting display process, the driving waveform corresponds to the on or off of the display content, and is actually a series of periodic rectangular square waves. The differentiating circuit utilizes the charge and discharge phenomenon of the capacitor to realize the purpose of sharp pulse waveform driving. Referring to fig. 2, fig. 2 is a schematic diagram of an embodiment of a differentiating circuit of a driving method of an electrowetting display device in the present invention; the input voltage Ui is a periodic rectangular square wave, the output voltage Uo is a spike pulse, the differentiating circuit comprises a resistor R1 and a capacitor C1, in the embodiment, the capacitor C1 has a capacitance of 15nF, and the resistor R1 has a resistance of 3k Ω; the excitation of the differentiating circuit is a single periodic rectangular pulse, and the output response is the voltage taken from the two ends of the resistor R1; the time constant of the differentiating circuit is less than or equal to 1/10 input pulse time width in terms of circuit time. Time constant τ of the differentiating circuit is 0.45 × 10-4τ is R × C. The smaller the value of RC, the narrower the pulse waveform time, and conversely the wider. The differentiating circuit only has output voltage at the moment when the input waveform changes suddenly, and no voltage value is output for a constant voltage input part. The differential circuit converts the input driving square wave into the sharp pulse wave to drive the electrowetting display device, so that the breakdown problem of pixel points is avoided; this driving method is successfully applied to passive electrowetting display panels. In practical use, resistors and capacitors with different sizes can be selected to form a proper differential circuit according to the process and materials for preparing the electrowetting display device.
In addition, referring to fig. 1, when the electrowetting display device is in the third stage where the driving voltage is continuously increased, since electrons in the electrowetting display fluid are captured by the display substrate, the electrowetting contact angle cannot be restored to the original state in the process of voltage reduction, so that the optical state of the display, that is, the contrast, the gray scale, and the aperture ratio of the display are reduced. Therefore, as a further improvement of the technical solution, the electrowetting display device driving method further includes:
a driving voltage-aperture ratio data acquisition step, namely performing spike pulse waveform driving on the electrowetting display device by using different driving voltages to acquire the aperture ratio of the electrowetting display device and obtain a plurality of groups of driving voltage-aperture ratio data; since the most important factor determining the brightness is the aperture ratio, it is possible to obtain the relative brightness of the electrowetting display device instead of the aperture ratio, in addition to directly obtaining the aperture ratio data of the electrowetting display device.
A fitting step, namely obtaining a fitting curve of the driving voltage and the aperture ratio of the electrowetting display device according to the plurality of groups of driving voltage-aperture ratio data;
an optimal driving step, namely acquiring a point with the maximum opening rate acceleration according to the fitting curve; and carrying out sharp pulse waveform driving on the electrowetting display device according to the driving voltage corresponding to the point with the maximum opening rate acceleration.
According to the driving voltage corresponding to the point with the maximum opening rate acceleration, the electrowetting display device is subjected to spike pulse waveform driving, the optimal driving of the electrowetting display device is achieved, the motion acceleration of pixel ink can be guaranteed, the withstand voltage value of a pixel can be improved, and the breakdown problem of pixels is avoided.
Further, the driving voltage-aperture ratio data obtaining step includes:
and acquiring multiple groups of driving voltage-aperture ratio data of the electrowetting display device in a non-polar fluid contraction stage along with the increase of the driving voltage or multiple groups of driving voltage-aperture ratio data of the electrowetting display device in a non-polar fluid expansion stage along with the decrease of the driving voltage.
In this embodiment, referring to fig. 2 and fig. 3, fig. 3 is a schematic structural diagram of an embodiment of a driving system of an electrowetting display device in the present invention; the electrowetting display device driving system comprises a power supply unit, an editable waveform function generator, a high-voltage amplifier and a differential circuit, wherein the editable waveform function generator edits waveform output, the high-voltage amplifier amplifies voltage and inputs the amplified voltage into the differential circuit, and the differential circuit processes the amplified voltage and outputs sharp pulse waveform to drive the electrowetting display screen. The differential circuit can be simulated by using Proteus, and the parameters are set to be 100Hz, 15nF for the capacitor C1 and 3 kOmega for the resistor R1. The drive square wave can be designed by using the editable waveform function generator, is amplified to a certain voltage value by the high-voltage amplifier, and is connected to the electrowetting display screen by the differential circuit. Then the magnitude of the drive voltage of the electrowetting display panel can be modified to obtain multiple sets of drive voltage-aperture ratio data using the drive system shown in fig. 3.
The implementation of the optimal drive is described in detail below: referring to fig. 1 and 3, the electrowetting display panel is driven by the system shown in fig. 3, in this embodiment, the size of a single pixel cell of the electrowetting display panel is 150 μm × 150 μm, the height of a pixel wall is 5.6 μm, the thickness of an insulating layer is 1 μm, the height from an ITO backplane to an upper cover plate in the pixel cell is 75 μm, and the color ink adopts n-decane as a solvent and has a molecular concentration of 10 wt%.
S0, applying an initial voltage between two electrodes of a pixel of the electrowetting display screen for a period of time to enable the nonpolar fluid in the electrowetting display to shrink; wherein the starting voltage is greater than or equal to the driving saturation voltage of the electrowetting display screen.
S1, acquiring the change of the electrowetting contact angle, the opening ratio or the reflectivity of the electrowetting electronic paper display screen along with the increase of the driving voltage, and the change of the electrowetting contact angle, the opening ratio or the reflectivity along with the decrease of the driving voltage; specifically, the aperture ratio of the display panel is measured every 0.1V starting from 0V to 40V, and sets of aperture ratio data (xi, yi) are obtained, where i is 0,1, …, m, where m is 321, x represents the voltage, and y represents the aperture ratio measured at each point.
S2, referring to fig. 4, fig. 4 is a schematic diagram of a fitting curve of an embodiment of a driving method of an electrowetting display device in the present invention;and (4) performing quadratic curve fitting on the data values of the driving voltage and the aperture ratio obtained in the step (S1), wherein the quadratic curve fitting is equivalent to predicting and evaluating an actual relationship between the two physical quantities by using a quadratic polynomial according to the obtained experimental data, and further determining a fitting curve. The fitting empirical equation is: p (x) ═ a0+a1x+a2x2Where x is known, i.e. the voltage value in the drive data, Q (a)0,a1,a2) Is the sum of squares of errors between the fitted curve and the experimental data a0,a1,a2And solving by the square error sum of the squares and the minimum value, and further determining a fitting curve.
By the extreme principle of a multivariate function, Q (a)0,a1,a2) The minimum value of (c) satisfies:
and (3) sorting to obtain a quadratic polynomial function fitting normal equation:
solving this equation to obtain a0,a1,a2To obtain a fitting function p (x) in the sense that the mean square error is minimal, to obtain a normal equation for a quadratic fit curve.
And S3, obtaining the aperture ratio acceleration in the driving process according to a quadratic fitting curve equation, obtaining a point P with the maximum aperture ratio acceleration, and increasing the acceleration of the pixel ink motion along with the increase of the applied maximum voltage.
And S4, driving the electrowetting display screen by using the driving voltage corresponding to the point P, namely, the requirements of aperture ratio and pixel non-breakdown can be simultaneously met.
The electrowetting display device is driven by a conventional driving scheme, i.e. by a square wave, to which a 40V driving voltage is applied for an electrowetting display panel with a saturation voltage of 32V. After the display screen is applied with 40V driving voltage for 8 times, the reaction speed of the ink is obviously slowed down. Referring to fig. 5, fig. 5 is a graph illustrating a variation of an aperture ratio of an electrowetting display panel under a high-voltage driving square wave in a conventional driving scheme; the change in the aperture ratio over a period of 120s from full on to off voltage after the ink movement speed decreased is shown. The switching time of a good electrowetting display screen is about 10ms, and after the driving voltage exceeding the threshold voltage is applied to the good electrowetting display screen, the ink in some pixel points still does not spread completely after 120s, and the average aperture ratio of the display screen is reduced from 75.71% to 49.03%. Moreover, the ink movement in the pixel points becomes sluggish, and some pixel points are broken down and are not controlled by voltage. When the electrowetting display device is driven by the spike pulse driving method of the present invention and a driving voltage of 40V is input to the differentiating circuit for driving, referring to fig. 6, fig. 6 is a diagram of a switching state of a display screen according to an embodiment of the driving method of the electrowetting display device of the present invention; the display screen switching state is shown after 2 minutes of driving voltage of 40V. Driving the pixel points by using driving voltages of different sizes, and obtaining the aperture opening ratio of the pixel points to obtain a variation curve of the aperture opening ratio of the pixel points, as shown in fig. 7, fig. 7 is a variation curve diagram of the aperture opening ratio of the pixel points according to a specific embodiment of the driving method of the electrowetting display device in the present invention; the aperture opening ratio of the pixel point can reach 81.5% at most, and is increased by 7.11% compared with a traditional square wave direct driving method; the opening ratio acceleration was obtained by quadratic fitting the opening ratio curve of fig. 7, and it was found that the opening ratio acceleration a was increased from 3.53 to 3.70.
It should be noted that the electrowetting display device in the embodiment of the present invention is a monochrome display, and is a passive driving display screen, and if the electrowetting display device to be driven is a color active electrowetting display screen, the driving method of the present invention can also be used for driving, and the same expected effect will be obtained.
The present invention also provides an electrowetting display device driving system comprising:
a driving voltage obtaining unit for obtaining a driving voltage of the electrowetting display device;
and the driving unit is used for carrying out sharp pulse waveform driving on the electrowetting display device according to the driving voltage.
Further, the drive unit includes
The driving waveform acquisition module is used for acquiring a driving square wave according to the driving voltage; specifically, referring to fig. 3, the driving waveform obtaining module includes an editable waveform function generator and a high-voltage amplifier, an output end of the editable waveform function generator is connected to an input end of the high-voltage amplifier, and an output end of the high-voltage amplifier is connected to an input end of the differential driving module.
And the differential driving module is used for inputting the driving square wave into the differential circuit to output a sharp pulse waveform to drive the electrowetting display device. Referring to fig. 3, the differential driving module is a differential circuit.
As a further improvement of the technical solution, the electrowetting display device driving system further comprises:
the driving voltage-aperture ratio data acquisition unit is used for carrying out spike pulse waveform driving on the electrowetting display device by using different driving voltages so as to acquire the aperture ratio of the electrowetting display device and obtain a plurality of groups of driving voltage-aperture ratio data;
the fitting unit is used for acquiring a fitting curve of the driving voltage and the aperture ratio of the electrowetting display device according to the plurality of groups of driving voltage-aperture ratio data;
the optimal driving unit is used for acquiring a point with the maximum opening rate acceleration according to the fitting curve; and carrying out sharp pulse waveform driving on the electrowetting display device according to the driving voltage corresponding to the point with the maximum opening rate acceleration.
The working process of the electrowetting display device driving system refers to the specific description of the electrowetting display device driving method, and is not repeated.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. An electrowetting display device driving method, comprising the steps of:
a driving voltage obtaining step of obtaining a driving voltage of the electrowetting display device;
a drive waveform obtaining step of obtaining a drive square wave based on the drive voltage,
a differential driving step of inputting the driving square wave into a differential circuit to output a sharp pulse waveform to drive the electrowetting display device;
a driving voltage-aperture ratio data acquisition step, in which different driving voltages are used for carrying out spike pulse waveform driving on the electrowetting display device so as to acquire the aperture ratio of the electrowetting display device, and a plurality of groups of driving voltage-aperture ratio data are obtained;
a fitting step, namely obtaining a fitting curve of the driving voltage and the aperture ratio of the electrowetting display device according to the plurality of groups of driving voltage-aperture ratio data;
an optimal driving step, namely acquiring a point with the maximum opening rate acceleration according to the fitting curve; and carrying out sharp pulse waveform driving on the electrowetting display device according to the driving voltage corresponding to the point with the maximum opening rate acceleration.
2. A method of driving an electrowetting display device according to claim 1, wherein a time constant of the differentiating circuit is less than or equal to 1/10 input pulse time width.
3. The electrowetting display device driving method according to claim 1, wherein the driving voltage-aperture ratio data obtaining step includes:
and acquiring multiple sets of driving voltage-aperture ratio data of the electrowetting display device in a non-polar fluid contraction stage along with the increase of the driving voltage or multiple sets of driving voltage-aperture ratio data of the electrowetting display device in a non-polar fluid expansion stage along with the decrease of the driving voltage.
4. An electrowetting display device driving system, comprising:
a driving voltage obtaining unit for obtaining a driving voltage of the electrowetting display device;
the driving unit is used for carrying out sharp pulse waveform driving on the electrowetting display device according to the driving voltage;
the drive unit comprises
A driving waveform obtaining module for obtaining a driving square wave according to the driving voltage,
the differential driving module is used for inputting the driving square wave into a differential circuit to output a sharp pulse waveform to drive the electrowetting display device;
the driving voltage-aperture ratio data acquisition unit is used for carrying out spike pulse waveform driving on the electrowetting display device by using different driving voltages so as to acquire the aperture ratio of the electrowetting display device and obtain a plurality of groups of driving voltage-aperture ratio data;
the fitting unit is used for acquiring a fitting curve of the driving voltage and the aperture ratio of the electrowetting display device according to the plurality of groups of driving voltage-aperture ratio data;
the optimal driving unit is used for acquiring a point with the maximum opening rate acceleration according to the fitted curve; and carrying out sharp pulse waveform driving on the electrowetting display device according to the driving voltage corresponding to the point with the maximum opening rate acceleration.
5. The electrowetting display device driving system according to claim 4, wherein the driving waveform obtaining module comprises an editable waveform function generator and a high voltage amplifier, an output terminal of the editable waveform function generator is connected to an input terminal of the high voltage amplifier, and an output terminal of the high voltage amplifier is connected to an input terminal of the differential driving module.
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| CN111341277A (en) * | 2020-03-19 | 2020-06-26 | 华南师范大学 | Electrowetting display device driving method and system |
| CN114898718B (en) * | 2022-06-10 | 2023-08-25 | 福州大学 | Real-time color conversion method for color electrowetting electronic paper |
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| CN101785683A (en) * | 2010-02-05 | 2010-07-28 | 东南大学 | Ultrasonic ophthalmic measuring device and method |
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| CN104765519B (en) * | 2015-04-27 | 2018-09-04 | 京东方科技集团股份有限公司 | Touch control detection circuit and display device |
| CN104867460A (en) * | 2015-05-20 | 2015-08-26 | 华南师范大学 | Gradation display modulating method for electrowetting display |
| CN106251813B (en) * | 2016-09-06 | 2018-09-25 | 深圳市国华光电科技有限公司 | Electrowetting drive waveforms generation method based on constant power and system |
| CN107507582B (en) * | 2017-10-18 | 2019-06-07 | 福州大学 | A method of adjustment electric moistening display drive waveforms |
| CN107808643B (en) * | 2017-12-15 | 2019-12-17 | 福州大学 | Color display method and device of electrowetting display |
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