CN109300437B - An electrowetting display device driving method and system - Google Patents
An electrowetting display device driving method and system Download PDFInfo
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Abstract
本发明公开了一种电润湿显示器件驱动方法及系统，获取电润湿显示器件的驱动电压后，根据驱动电压对电润湿显示器件进行尖脉冲波形驱动，克服现有技术中，随着驱动电压的增大，电润湿显示器件的像素容易被击穿的技术问题，可有效避免电润湿显示器件的像素被击穿的情形。
The invention discloses a driving method and system for an electro-wetting display device. After obtaining the driving voltage of the electro-wetting display device, the electro-wetting display device is driven with a sharp pulse waveform according to the driving voltage. With the increase of the driving voltage, the technical problem that the pixels of the electrowetting display device are easily broken down can effectively avoid the situation that the pixels of the electrowetting display device are broken down.
Description
技术领域technical field
本发明涉及电润湿领域，尤其是一种电润湿显示器件驱动方法及系统。The invention relates to the field of electrowetting, in particular to a driving method and system for an electrowetting display device.
背景技术Background technique
近年来，反射式显示器件备受关注，其中最吸引人的应用之一就是电润湿(电润湿又名电湿润)显示器件，因其是基于加电状态下对极性液体的控制下实现显示，故而相对于其他的反射显示器件而言，其反应速度较快，同时也能实现高亮度、高对比度、低能耗。但如何在电润湿器件上显示图片甚至视频仍有很大的进步空间。Reflective display devices have received much attention in recent years, and one of the most attractive applications is electrowetting (electrowetting, also known as electrowetting) display devices, which are based on the control of polar liquids in an electrified state. Therefore, compared with other reflective display devices, its response speed is faster, and it can also achieve high brightness, high contrast, and low energy consumption. But there is still a lot of room for improvement in how to display pictures and even videos on electrowetting devices.
现有技术中都是利用TFT(Thin Film Transistor薄膜晶体管)对电润湿显示单元进行控制，然后再利用软硬件控制电压来实现灰度显示。即类似于液晶显示器，薄膜晶体管集成在电润湿器件上的每一像素点后，利用行列扫描方式来控制每个像素点的开关情况，再利用算法控制输出的电压，使每个单元的显示亮度不一从而达到灰度的实现。已知的电润湿显示器包括多个像素格，图1是电润湿显示器中的单个像素格剖面图，如图1所示，像素格包括：第一基板8、第二基板1、第一电极7、第二电极2、绝缘层3、像素墙4、第一流体5以及第二流体6；第二电极2设置在第二基板1上，绝缘层3设置在第二电极2上，像素墙4设置在绝缘层3上，第一流体5填充于每两个相邻的像素墙之间，第一流体5不透光，并与第二流体6互不相溶，第二流体6透光并具有导电性或极性，第二流体6填充在第一流体5与第一电极7之间。其中第一流体5优选为油墨，第二流体6优选为水。电润湿电子纸是基于两种流体接触角改变而实现显示开关，电润湿接触角存在一种迟滞现象，即接触角的变化存在三个阶段。第一阶段是在开始施加像素电压时，电润湿接触角变化不大，从人眼视觉上无法观察到显示器在光学上的变化，即接触角的阈值电压；第二阶段是随着电压的增大，电润湿接触角变化明显，可观察到明显的光学变化；第三阶段是当电压持续增大时，电润湿接触角基本没有发生变化，处于一种饱和的状态，此时同样观察不到明显的光学变化；另外，部分油墨会不受驱动电压的控制，油膜的伸缩性能在电压的驱动控制下失去了可逆性，电润湿油墨像素被击穿。In the prior art, TFT (Thin Film Transistor) is used to control the electrowetting display unit, and then software and hardware are used to control voltage to realize grayscale display. That is, similar to a liquid crystal display, after the thin film transistor is integrated into each pixel on the electrowetting device, the row and column scanning method is used to control the switching situation of each pixel, and then the algorithm is used to control the output voltage, so that the display of each unit is The brightness is different to achieve the realization of grayscale. A known electrowetting display includes a plurality of pixel grids. FIG. 1 is a cross-sectional view of a single pixel grid in the electrowetting display. As shown in FIG. 1 , the pixel grid includes: a
发明内容SUMMARY OF THE INVENTION
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。为此，本发明的一个目的是提供一种电润湿显示器件驱动方法及系统，用于有效避免电润湿显示器件的像素被击穿。The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an object of the present invention is to provide a driving method and system for an electrowetting display device, which are used to effectively avoid the breakdown of pixels of the electrowetting display device.
本发明所采用的技术方案是：一种电润湿显示器件驱动方法，包括以下步骤：The technical solution adopted in the present invention is: a driving method for an electrowetting display device, comprising the following steps:
驱动电压获取步骤，获取电润湿显示器件的驱动电压；The step of obtaining the driving voltage is to obtain the driving voltage of the electrowetting display device;
驱动步骤，根据所述驱动电压对所述电润湿显示器件进行尖脉冲波形驱动。In the driving step, the electrowetting display device is driven with a spike waveform according to the driving voltage.
进一步地，所述驱动步骤包括：Further, the driving step includes:
驱动波形获取步骤，根据所述驱动电压获取驱动方波，The step of obtaining a driving waveform is to obtain a driving square wave according to the driving voltage,
微分驱动步骤，将所述驱动方波输入微分电路以输出尖脉冲波形驱动所述电润湿显示器件。In the differential driving step, the driving square wave is input into a differential circuit to output a sharp pulse waveform to drive the electrowetting display device.
进一步地，所述微分电路的时间常数小于或等于1/10的输入脉冲时间宽度。Further, the time constant of the differentiating circuit is less than or equal to 1/10 of the input pulse time width.
进一步地，所述电润湿显示器件驱动方法还包括：Further, the electrowetting display device driving method further includes:
驱动电压-开口率数据获取步骤，利用不同驱动电压对所述电润湿显示器件进行尖脉冲波形驱动以获取所述电润湿显示器件的开口率，得到多组驱动电压-开口率数据；The step of acquiring driving voltage-aperture ratio data, using different driving voltages to drive the electrowetting display device with a spike waveform to obtain the aperture ratio of the electrowetting display device, and obtaining multiple sets of driving voltage-aperture ratio data;
拟合步骤，根据所述多组驱动电压-开口率数据获取电润湿显示器件的驱动电压与开口率的拟合曲线；The fitting step is to obtain a fitting curve between the driving voltage and the aperture ratio of the electrowetting display device according to the plurality of sets of driving voltage-aperture ratio data;
最优驱动步骤，根据所述拟合曲线获取开口率加速度最大的点；根据所述开口率加速度最大的点所对应的驱动电压对所述电润湿显示器件进行尖脉冲波形驱动。In the optimal driving step, the point with the maximum aperture ratio acceleration is obtained according to the fitting curve; and the electrowetting display device is driven with a spike waveform according to the driving voltage corresponding to the point with the maximum aperture ratio acceleration.
进一步地，所述驱动电压-开口率数据获取步骤包括：Further, the step of obtaining the driving voltage-aperture ratio data includes:
获取随着所述驱动电压上升，所述电润湿显示器件处于非极性流体收缩阶段的多组驱动电压-开口率数据或随着所述驱动电压下降，所述电润湿显示器件处于非极性流体扩张阶段的多组驱动电压-开口率数据。Acquire multiple sets of driving voltage-aperture ratio data when the electrowetting display device is in a non-polar fluid shrinking stage as the driving voltage increases, or as the driving voltage decreases, the electrowetting display device is in a non-polar fluid shrinkage stage. Multiple sets of driving voltage-opening ratio data for polar fluid expansion stages.
本发明所采用的另一技术方案是：一种电润湿显示器件驱动系统，包括：Another technical solution adopted by the present invention is: an electrowetting display device driving system, comprising:
驱动电压获取单元，用于获取电润湿显示器件的驱动电压；a driving voltage acquiring unit, used for acquiring the driving voltage of the electrowetting display device;
驱动单元，用于根据所述驱动电压对所述电润湿显示器件进行尖脉冲波形驱动。The driving unit is configured to drive the electrowetting display device with a spike waveform according to the driving voltage.
进一步地，所述驱动单元包括Further, the drive unit includes
驱动波形获取模块，用于根据所述驱动电压获取驱动方波，a driving waveform acquisition module, configured to acquire a driving square wave according to the driving voltage,
微分驱动模块，用于将所述驱动方波输入微分电路以输出尖脉冲波形驱动所述电润湿显示器件。A differential driving module is used for inputting the driving square wave into a differential circuit to drive the electrowetting display device by outputting a sharp pulse waveform.
进一步地，所述驱动波形获取模块包括可编辑波形函数发生器和高压放大器，所述可编辑波形函数发生器的输出端与高压放大器的输入端连接，所述高压放大器的输出端与所述微分驱动模块的输入端连接。Further, the drive waveform acquisition module includes an editable waveform function generator and a high-voltage amplifier, the output end of the editable waveform function generator is connected to the input end of the high-voltage amplifier, and the output end of the high-voltage amplifier is connected to the differential The input terminal of the drive module is connected.
进一步地，所述电润湿显示器件驱动系统还包括：Further, the electrowetting display device driving system also includes:
驱动电压-开口率数据获取单元，用于利用不同驱动电压对所述电润湿显示器件进行尖脉冲波形驱动以获取所述电润湿显示器件的开口率，得到多组驱动电压-开口率数据；A driving voltage-aperture ratio data acquisition unit, used to drive the electrowetting display device with a spike waveform with different driving voltages to obtain the aperture ratio of the electrowetting display device, and obtain multiple sets of driving voltage-aperture ratio data ;
拟合单元，用于根据所述多组驱动电压-开口率数据获取电润湿显示器件的驱动电压与开口率的拟合曲线；a fitting unit, configured to obtain a fitting curve between the driving voltage and the aperture ratio of the electrowetting display device according to the plurality of sets of driving voltage-aperture ratio data;
最优驱动单元，用于根据所述拟合曲线获取开口率加速度最大的点；根据所述开口率加速度最大的点所对应的驱动电压对所述电润湿显示器件进行尖脉冲波形驱动。The optimal driving unit is configured to obtain the point with the maximum aperture ratio acceleration according to the fitting curve; and perform spike waveform driving on the electrowetting display device according to the driving voltage corresponding to the point with the maximum aperture ratio acceleration.
本发明的有益效果是：The beneficial effects of the present invention are:
本发明一种电润湿显示器件驱动方法及系统，获取电润湿显示器件的驱动电压后，根据驱动电压对电润湿显示器件进行尖脉冲波形驱动，克服现有技术中，随着驱动电压的增大，电润湿显示器件的像素容易被击穿的技术问题，可有效避免电润湿显示器件的像素被击穿的情形。The present invention provides a method and system for driving an electrowetting display device. After obtaining the driving voltage of the electrowetting display device, the electrowetting display device is driven with a sharp pulse waveform according to the driving voltage. The technical problem that the pixel of the electrowetting display device is easily broken down can effectively avoid the situation that the pixel of the electrowetting display device is broken down.
附图说明Description of drawings
下面结合附图对本发明的具体实施方式作进一步说明：The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings:
图1是电润湿显示器中的单个像素格剖面图；1 is a cross-sectional view of a single pixel grid in an electrowetting display;
图2是本发明中一种电润湿显示器件驱动方法的微分电路的一具体实施例示意图；2 is a schematic diagram of a specific embodiment of a differential circuit of a method for driving an electrowetting display device according to the present invention;
图3是本发明中一种电润湿显示器件驱动系统的一具体实施例结构示意图；3 is a schematic structural diagram of a specific embodiment of an electrowetting display device driving system in the present invention;
图4是本发明中一种电润湿显示器件驱动方法的一具体实施例拟合曲线示意图；4 is a schematic diagram of a fitting curve of a specific embodiment of an electrowetting display device driving method in the present invention;
图5是现有驱动方案中，高压驱动方波下电润湿显示屏开口率变化图；Fig. 5 is a graph showing the change of aperture ratio of electrowetting display screen under high-voltage driving square wave in the existing driving scheme;
图6是本发明中一种电润湿显示器件驱动方法的一具体实施例显示屏开关状态图；6 is a display screen switch state diagram of a specific embodiment of an electrowetting display device driving method in the present invention;
图7是本发明中一种电润湿显示器件驱动方法的一具体实施例像素点开口率变化曲线图。FIG. 7 is a graph showing a change in aperture ratio of a pixel point according to a specific embodiment of a method for driving an electrowetting display device according to the present invention.
具体实施方式Detailed ways
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict.
一种电润湿显示器件驱动方法，包括以下步骤：A method for driving an electrowetting display device, comprising the following steps:
驱动电压获取步骤，获取电润湿显示器件的驱动电压；The step of obtaining the driving voltage is to obtain the driving voltage of the electrowetting display device;
驱动步骤，根据驱动电压对电润湿显示器件进行尖脉冲波形驱动。In the driving step, the electrowetting display device is driven with a sharp pulse waveform according to the driving voltage.
通过尖脉冲波形驱动电润湿显示器件，克服了现有技术中，随着驱动电压的增大，电润湿显示器件的像素容易被击穿的技术问题，可有效避免电润湿显示器件的像素被击穿的情形。The electrowetting display device is driven by the sharp pulse waveform, which overcomes the technical problem that the pixels of the electrowetting display device are easily broken down with the increase of the driving voltage in the prior art, and can effectively avoid the electrowetting display device. The case where the pixel is broken down.
作为技术方案的进一步改进，驱动步骤包括：As a further improvement of the technical solution, the driving steps include:
驱动波形获取步骤，根据驱动电压获取驱动波形，本实施例中，驱动波形为驱动方波。In the step of obtaining the driving waveform, the driving waveform is obtained according to the driving voltage. In this embodiment, the driving waveform is a driving square wave.
微分驱动步骤，将驱动方波输入微分电路以输出尖脉冲波形驱动电润湿显示器件。In the differential driving step, the driving square wave is input into the differential circuit to output the sharp pulse waveform to drive the electrowetting display device.
其中，在电润湿显示过程中，驱动波形对应显示内容的打开或关闭，实际上是一连串的周期矩形方波。而微分电路是利用电容器的充放电现象来实现尖脉冲波形驱动的目的。参考图2，图2是本发明中一种电润湿显示器件驱动方法的微分电路的一具体实施例示意图；输入电压Ui为周期矩形方波，输出电压Uo为尖峰脉冲，微分电路包括电阻R1和电容C1，本实施例中，电容C1的电容为15nF，电阻R1的阻值为3kΩ；微分电路的激励为单周期性的矩形脉冲，输出响应是从电阻R1的两端取到的电压；在电路时间方面，微分电路的时间常数小于或等于1/10的输入脉冲时间宽度。微分电路的时间常数τ＝0.45×10-4，τ＝R×C。RC的值越小，脉冲波形时间越窄，反之则愈宽。微分电路只有在输入波形发生突变的瞬间才有输出电压，对于恒定的电压输入部分没有任何电压数值输出。微分电路将输入的驱动方波转为尖脉冲波进而驱动电润湿显示器件，避免了像素点的击穿问题；这一驱动方法成功应用到无源电润湿显示屏中。实际使用时，可以根据制备电润湿显示器件的工艺和材料，选择大小不同的电阻和电容组成合适的微分电路。Among them, in the electrowetting display process, the driving waveform corresponds to the opening or closing of the display content, which is actually a series of periodic rectangular square waves. The differential circuit uses the charging and discharging phenomenon of the capacitor to achieve the purpose of driving the sharp pulse waveform. Referring to FIG. 2, FIG. 2 is a schematic diagram of a specific embodiment of a differential circuit of a driving method for 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, and the differential circuit includes a resistor R1 and capacitor C1, in this embodiment, the capacitance of capacitor C1 is 15nF, and the resistance value of resistor R1 is 3kΩ; the excitation of the differential circuit is a single periodic rectangular pulse, and the output response is the voltage obtained from both ends of the resistor R1; In terms of circuit time, the time constant of the differentiating circuit is less than or equal to 1/10 of the input pulse time width. The time constant of the differentiating circuit is τ=0.45×10 −4 , and τ=R×C. The smaller the value of RC, the narrower the pulse waveform time, and vice versa. The differential circuit only has an output voltage at the moment when the input waveform suddenly changes, and there is no voltage value output for the constant voltage input part. The differential circuit converts the input driving square wave into a sharp pulse wave and then drives the electrowetting display device, avoiding the problem of pixel breakdown; this driving method has been successfully applied to the passive electrowetting display. In actual use, resistors and capacitors of different sizes can be selected to form a suitable differential circuit according to the process and materials for preparing the electrowetting display device.
另外，参考图1，当电润湿显示器件处于驱动电压持续增大的第三阶段时，由于电润湿显示器流体中的电子被显示基板所俘获，电润湿接触角在电压减小的过程中无法恢复到原来的状态，使得显示器的光学状态亦即显示器的对比度或灰度、开口率减小。因此，作为技术方案的进一步改进，电润湿显示器件驱动方法还包括：In addition, referring to FIG. 1 , when the electrowetting display device is in the third stage in which the driving voltage continues to increase, since the electrons in the electrowetting display fluid are captured by the display substrate, the electrowetting contact angle is in the process of decreasing the voltage. It cannot be restored to the original state, so that the optical state of the display, that is, the contrast, grayscale, and aperture ratio of the display is reduced. Therefore, as a further improvement of the technical solution, the driving method of the electrowetting display device further includes:
驱动电压-开口率数据获取步骤，利用不同驱动电压对电润湿显示器件进行尖脉冲波形驱动以获取电润湿显示器件的开口率，得到多组驱动电压-开口率数据；由于决定亮度最重要的因素就是开口率，因此，除了直接获取电润湿显示器件的开口率数据，获取电润湿显示器件的相对亮度来代替开口率也是可以的。In the step of acquiring driving voltage-aperture ratio data, different driving voltages are used to drive the electrowetting display device with a sharp pulse waveform to obtain the aperture ratio of the electrowetting display device, and multiple sets of driving voltage-aperture ratio data are obtained; since the determination of brightness is the most important The main factor is the aperture ratio. Therefore, in addition to directly obtaining the aperture ratio data of the electrowetting display device, it is also possible to obtain the relative brightness of the electrowetting display device instead of the aperture ratio.
拟合步骤，根据多组驱动电压-开口率数据获取电润湿显示器件的驱动电压与开口率的拟合曲线；In the fitting step, a fitting curve between the driving voltage and the aperture ratio of the electrowetting display device is obtained according to the plurality of sets of driving voltage-aperture ratio data;
最优驱动步骤，根据拟合曲线获取开口率加速度最大的点；根据开口率加速度最大的点所对应的驱动电压对电润湿显示器件进行尖脉冲波形驱动。In the optimal driving step, the point with the largest aperture ratio acceleration is obtained according to the fitting curve; the electrowetting display device is driven with a sharp pulse waveform according to the driving voltage corresponding to the point with the largest aperture ratio acceleration.
根据开口率加速度最大的点所对应的驱动电压对电润湿显示器件进行尖脉冲波形驱动，实现电润湿显示器件的最优驱动，不仅能够保证像素油墨的运动加速度，还可以改善像素的耐压值，避免了像素点的击穿问题。According to the driving voltage corresponding to the point with the largest aperture ratio acceleration, the electrowetting display device is driven by a sharp pulse waveform to realize the optimal driving of the electrowetting display device, which can not only ensure the motion acceleration of the pixel ink, but also improve the pixel resistance. pressure value, to avoid the problem of pixel breakdown.
进一步地，驱动电压-开口率数据获取步骤包括：Further, the step of acquiring the driving voltage-aperture ratio data includes:
获取随着驱动电压上升，电润湿显示器件处于非极性流体收缩阶段的多组驱动电压-开口率数据或随着驱动电压下降，电润湿显示器件处于非极性流体扩张阶段的多组驱动电压-开口率数据。Obtain multiple sets of driving voltage-aperture ratio data when the electrowetting display device is in the non-polar fluid shrinking stage as the driving voltage increases, or multiple sets of the electrowetting display device in the non-polar fluid expansion stage as the driving voltage decreases Driving voltage-aperture ratio data.
本实施例中，参考图2和图3，图3是本发明中一种电润湿显示器件驱动系统的一具体实施例结构示意图；电润湿显示器件驱动系统包括电源单元、可编辑波形函数发生器、高压放大器和微分电路，可编辑波形函数发生器编辑波形输出，再通过高压放大器放大电压后输入微分电路，经过微分电路处理后输出尖脉冲波形驱动电润湿显示屏。其中，微分电路可以采用了Proteus对微分电路进行仿真模拟，参数设置为频率f＝100Hz，电容C1的电容为15nF，电阻R1的阻值为3kΩ。利用可编辑波形函数发生器可以设计驱动方波，经过高压放大器放大到一定得电压值，经过微分电路连接到电润湿显示屏。则利用图3所示驱动系统，可以修改电润湿显示屏的驱动电压的大小，以获取多组驱动电压-开口率数据。In this embodiment, referring to FIG. 2 and FIG. 3 , FIG. 3 is a schematic structural diagram of a specific embodiment of an electrowetting display device driving system in the present invention; the electrowetting display device driving system includes a power supply unit, an editable waveform function Generator, high-voltage amplifier and differential circuit, editable waveform function generator to edit the waveform output, and then amplify the voltage through the high-voltage amplifier and input it into the differential circuit. After processing by the differential circuit, the output spike waveform drives the electro-wetting display. Among them, the differential circuit can use Proteus to simulate the differential circuit, the parameters are set as frequency f=100Hz, the capacitance of capacitor C1 is 15nF, and the resistance value of resistor R1 is 3kΩ. Using an editable waveform function generator, a driving square wave can be designed, amplified to a certain voltage value by a high-voltage amplifier, and connected to the electrowetting display screen through a differential circuit. Then, using the driving system shown in FIG. 3 , the magnitude of the driving voltage of the electrowetting display screen can be modified to obtain multiple sets of driving voltage-aperture ratio data.
下面具体说明最优驱动的实现过程：参考图1和图3，利用图3所示系统来驱动电润湿显示屏，本实施例中，所用的电润湿显示屏单个像素格的尺寸为150μm×150μm，像素墙高度为5.6μm，绝缘层厚度为1μm，像素格内ITO底板到上盖板的高度为75μm，彩色油墨采用溶剂正十烷，分子浓度为10wt％。The implementation process of optimal driving is described in detail below: Referring to Figure 1 and Figure 3, the electrowetting display screen is driven by the system shown in Figure 3. In this embodiment, the size of a single pixel grid of the electrowetting display screen used is 150 μm ×150μm, the height of the pixel wall is 5.6μm, the thickness of the insulating layer is 1μm, the height from the ITO bottom plate in the pixel grid to the upper cover plate is 75μm, and the color ink adopts the solvent n-dodecane, and the molecular concentration is 10wt%.
S0、向电润湿显示屏的像素两电极间施加一起始电压并持续一段时间，使电润湿显示器中的非极性流体收缩；其中，起始电压大于或等于电润湿显示屏的驱动饱和电压。S0, apply an initial voltage between the two electrodes of the pixel of the electrowetting display screen and continue for a period of time, so that the non-polar fluid in the electrowetting display screen shrinks; wherein, the initial voltage is greater than or equal to the driving force of the electrowetting display screen Saturation voltage.
S1、获取电润湿电子纸显示屏随着驱动电压增大，电润湿接触角、开口率或反射率的变化，以及随着驱动电压减小，电润湿接触角、开口率或反射率的变化；具体地，从0V开始施加驱动电压到40V，每0.1V测试一次显示屏的开口率，得到多组开口率数据(xi，yi)，i＝0,1,…,m，这里m＝321，x表示电压，y表示每个点所测的开口率。S1. Obtain the change of the electrowetting contact angle, aperture ratio or reflectivity of the electrowetting electronic paper display as the driving voltage increases, and as the driving voltage decreases, the electrowetting contact angle, aperture ratio or reflectance Specifically, the driving voltage is applied from 0V to 40V, and the aperture ratio of the display screen is tested every 0.1V to obtain multiple sets of aperture ratio data (xi, yi), i=0,1,...,m, where m =321, x represents the voltage, y represents the aperture ratio measured at each point.
S2、参考图4，图4是本发明中一种电润湿显示器件驱动方法的一具体实施例拟合曲线示意图；对步骤S1中所得到驱动电压和开口率的数据值进行二次曲线拟合，二次曲线拟合相当于根据所得的实验数据用二次多项式去预测评估两种物理量之间的实际关系，进而确定拟合曲线。拟合经验方程为：p(x)＝a0+a1x+a2x2，其中，x是已知的，即驱动数据中的电压值，Q(a0,a1,a2)为拟合曲线与实验数据之间的误差平方和a0,a1,a2通过误差平方和最小值解得，进而确定拟合曲线。S2. Referring to FIG. 4, FIG. 4 is a schematic diagram of a fitting curve of a specific embodiment of an electrowetting display device driving method in the present invention; a quadratic curve fitting is performed on the data values of the driving voltage and aperture ratio obtained in step S1 Combined, quadratic curve fitting is equivalent to using quadratic polynomials to predict and evaluate the actual relationship between two physical quantities based on the obtained experimental data, and then determine the fitting curve. The fitting empirical equation is: p(x)=a 0 +a 1 x+a 2 x 2 , where x is known, that is, the voltage value in the driving data, Q(a 0 ,a 1 ,a 2 ) In order to obtain the error sum of squares a 0 , a 1 , and a 2 between the fitting curve and the experimental data, the minimum value of the sum of squares of the error is obtained, and then the fitting curve is determined.
由多元函数的极值原理，Q(a0,a1,a2)的极小值满足：According to the extremum principle of multivariate functions, the minimum value of Q(a 0 , a 1 , a 2 ) satisfies:
整理得到二次多项式函数拟合的法方程：Arrange the normal equation to get the quadratic polynomial function fitting:
解得此方程得到a0,a1,a2的值，从而得到在均方差最小意义下的拟合函数p(x)，从而得到二次拟合曲线的法方程。Solve this equation to get the values of a 0 , a 1 , a 2 , and then get the fitting function p(x) in the sense of minimum mean square error, and then get the normal equation of the quadratic fitting curve.
S3、根据二次拟合曲线方程，得到驱动过程中的开口率加速度，求得开口率加速度最大的P点，像素油墨运动的加速度随施加最大电压的增大而增大。S3. According to the quadratic fitting curve equation, the aperture ratio acceleration in the driving process is obtained, and the P point with the largest aperture ratio acceleration is obtained. The acceleration of pixel ink movement increases with the increase of the maximum applied voltage.
S4、利用P点所对应的驱动电压驱动电润湿显示屏，即可以同时满足开口率和像素不被击穿的要求。S4. The electrowetting display screen is driven by the driving voltage corresponding to the point P, that is, the requirements of aperture ratio and pixel not being broken down can be satisfied at the same time.
利用传统的驱动方案驱动电润湿显示器件，即采用方波来驱动，对于一个饱和电压为32V的电润湿显示屏，对其施加40V驱动电压。将显示屏施加40V驱动电压开关8次后，油墨的反应速度明显减缓。参考图5，图5是现有驱动方案中，高压驱动方波下电润湿显示屏开口率变化图；示意了油墨运动速度降低后，从全开到关闭电压后的120s时间内的开口率变化。良好的电润湿显示屏开关时间约为10ms，而对其施加超过阈值电压的驱动电压后，120s后一些像素点中油墨仍然没有完全铺开，显示屏的平均开口率从75.71％降低到49.03％。并且，像素点中油墨运动变得迟滞，一些像素点被击穿，不受电压的控制。而采用本发明的尖脉冲驱动方法驱动上述电润湿显示器件，40V的驱动电压输入微分电路进行驱动时，参考图6，图6是本发明中一种电润湿显示器件驱动方法的一具体实施例显示屏开关状态图；示意了40V驱动电压下持续2分钟后的显示屏开关状态。利用不同大小的驱动电压驱动像素点，并获取像素点的开口率，得到像素点开口率的变化曲线，如图7所示，图7是本发明中一种电润湿显示器件驱动方法的一具体实施例像素点开口率变化曲线图；像素点开口率最大可达到81.5％，比采用传统方波直接驱动的方法增加了7.11％；对图7的开口率曲线进行二次拟合，求得开口率加速度，得知从开口率加速度a＝3.53提高到a＝3.70。The electrowetting display device is driven by a traditional driving scheme, that is, a square wave is used to drive the electrowetting display device. For an electrowetting display screen with a saturation voltage of 32V, a driving voltage of 40V is applied to it. After applying 40V driving voltage to the display screen for 8 times, the reaction speed of the ink is obviously slowed down. Referring to FIG. 5, FIG. 5 is a graph of the aperture ratio change of the electrowetting display screen under the high-voltage driving square wave in the existing driving scheme; after the ink movement speed is reduced, the aperture ratio within 120s from full opening to closing the voltage is shown. Variety. The switching time of a good electrowetting display is about 10ms, and after applying a driving voltage exceeding the threshold voltage, the ink in some pixels is still not fully spread out after 120s, and the average aperture ratio of the display is reduced from 75.71% to 49.03 %. Also, the ink movement in the pixels becomes sluggish, and some pixels are broken down and are not controlled by the voltage. When the above-mentioned electrowetting display device is driven by the sharp pulse driving method of the present invention, when a driving voltage of 40V is input to the differential circuit for driving, referring to FIG. 6, FIG. 6 is a specific driving method of an electrowetting display device in the present invention Example display screen switch state diagram; shows the display screen switch state after 2 minutes at 40V driving voltage. Use driving voltages of different sizes to drive pixels, and obtain the aperture ratio of the pixel to obtain the change curve of the aperture ratio of the pixel, as shown in FIG. Specific example of the change curve of the aperture ratio of pixel points; the maximum aperture ratio of pixel points can reach 81.5%, an increase of 7.11% compared with the traditional square wave direct drive method; the aperture ratio curve in Figure 7 is quadratic fitting to obtain As for the aperture ratio acceleration, it was found that the aperture ratio acceleration a=3.53 increased to a=3.70.
需要说明的是，本发明的实施例中的电润湿显示器件为单色显示器，并且为无源驱动显示屏，如果所要驱动的电润湿显示器件为彩色有源电润湿显示屏，也可以使用本发明的驱动方法进行驱动，将获得同样的预期效果。It should be noted that the electrowetting display device in the embodiment of the present invention is a monochrome display and is a passively driven display screen. If the electrowetting display device to be driven is a color active electrowetting display screen, it is also The driving method of the present invention can be used for driving, and the same expected effect will be obtained.
本发明还提供一种电润湿显示器件驱动系统，包括：The present invention also provides an electrowetting display device driving system, comprising:
驱动电压获取单元，用于获取电润湿显示器件的驱动电压；a driving voltage acquiring unit, used for acquiring the driving voltage of the electrowetting display device;
驱动单元，用于根据驱动电压对电润湿显示器件进行尖脉冲波形驱动。The driving unit is used for driving the electrowetting display device with a spike waveform according to the driving voltage.
进一步地，驱动单元包括Further, the drive unit includes
驱动波形获取模块，用于根据驱动电压获取驱动方波；具体地，参考图3，驱动波形获取模块包括可编辑波形函数发生器和高压放大器，可编辑波形函数发生器的输出端与高压放大器的输入端连接，高压放大器的输出端与微分驱动模块的输入端连接。The driving waveform acquisition module is used to acquire the driving square wave according to the driving voltage; specifically, referring to FIG. 3 , the driving waveform acquisition module includes an editable waveform function generator and a high-voltage amplifier, and the output end of the editable waveform function generator is connected to the high-voltage amplifier. The input end is connected, and the output end of the high-voltage amplifier is connected with the input end of the differential driving module.
微分驱动模块，用于将驱动方波输入微分电路以输出尖脉冲波形驱动电润湿显示器件。参考图3，微分驱动模块即为微分电路。The differential driving module is used to input the driving square wave into the differential circuit to output the sharp pulse waveform to drive the electrowetting display device. Referring to FIG. 3 , the differential driving module is a differential circuit.
作为技术方案的进一步改进，电润湿显示器件驱动系统还包括：As a further improvement of the technical solution, the electrowetting display device driving system also includes:
驱动电压-开口率数据获取单元，用于利用不同驱动电压对电润湿显示器件进行尖脉冲波形驱动以获取电润湿显示器件的开口率，得到多组驱动电压-开口率数据；The driving voltage-aperture ratio data acquisition unit is used to drive the electrowetting display device with a sharp pulse waveform with different driving voltages to obtain the aperture ratio of the electrowetting display device, and obtain multiple sets of driving voltage-aperture ratio data;
拟合单元，用于根据多组驱动电压-开口率数据获取电润湿显示器件的驱动电压与开口率的拟合曲线；a fitting unit, configured to obtain a fitting curve between the driving voltage and the aperture ratio of the electrowetting display device according to the plurality of sets of driving voltage-aperture ratio data;
最优驱动单元，用于根据拟合曲线获取开口率加速度最大的点；根据开口率加速度最大的点所对应的驱动电压对电润湿显示器件进行尖脉冲波形驱动。The optimal driving unit is used to obtain the point with the largest aperture ratio acceleration according to the fitting curve; and according to the driving voltage corresponding to the point with the largest aperture ratio acceleration, the electrowetting display device is driven with a spike waveform.
电润湿显示器件驱动系统的工作过程参照上述电润湿显示器件驱动方法的具体描述，不再赘述。For the working process of the electrowetting display device driving system, refer to the specific description of the above-mentioned electrowetting display device driving method, which will not be repeated.
以上是对本发明的较佳实施进行了具体说明，但本发明创造并不限于所述实施例，熟悉本领域的技术人员在不违背本发明精神的前提下还可做出种种的等同变形或替换，这些等同的变形或替换均包含在本申请权利要求所限定的范围内。The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent deformations or replacements on the premise that does not violate the spirit of the present invention , these equivalent modifications or substitutions are all included within the scope defined by the claims of the present application.
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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 |
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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: ACADEMY OF SHENZHEN GUOHUA OPTOELECTRONICS Patentee before: SOUTH CHINA NORMAL University |
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Application publication date: 20190201 Assignee: Guangxian Technology (Guangdong) Co.,Ltd. Assignor: SHENZHEN GUOHUA OPTOELECTRONICS Co.,Ltd. Contract record no.: X2024980014572 Denomination of invention: A driving method and system for electro wetting display devices Granted publication date: 20201124 License type: Exclusive License Record date: 20240910 |