CN107945749A - A kind of driving method for adjusting the more gray scales of electric moistening display and showing - Google Patents
A kind of driving method for adjusting the more gray scales of electric moistening display and showing Download PDFInfo
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- G09G3/348—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 the deformation of a fluid drop, e.g. electrowetting
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Abstract
本发明公开了一种调整电润湿显示器多灰度显示的驱动方法，电润湿显示器的驱动电压波形包括若干个子帧周期，其中最后一个子帧周期对应复位脉冲，其余子帧周期对应驱动脉冲，在驱动时间不变的情况下，设置所述驱动脉冲的子帧脉宽不等且任意排列。本发明利用脉宽不等的驱动脉冲子帧随机组合可以在不影响刷新周期的情况下提高显示灰度从而使被显示图像细节更加细腻，复位脉冲根据当前像素点灰度值的不同而选择脉宽长度不同，有利于抑制电润湿的电荷泄露。
The invention discloses a driving method for adjusting multi-grayscale display of an electrowetting display. The driving voltage waveform of the electrowetting display includes several subframe periods, wherein the last subframe period corresponds to a reset pulse, and the remaining subframe periods correspond to driving pulses. , under the condition that the driving time is constant, the sub-frame pulse widths of the driving pulses are set to be unequal and arranged arbitrarily. The invention utilizes the random combination of driving pulse subframes with different pulse widths to increase the display gray level without affecting the refresh cycle, so that the details of the displayed image are more delicate, and the reset pulse is selected according to the difference in the current pixel gray value. The width and length are different, which is beneficial to suppress the charge leakage of electrowetting.
Description
技术领域technical field
本发明涉及显示器技术领域，特别涉及一种调整电润湿显示器多灰度显示的驱动方法。The invention relates to the technical field of displays, in particular to a driving method for adjusting multi-grayscale display of an electrowetting display.
背景技术Background technique
近年来，电子纸显示器件因其观感效果类似于纸张，低功耗、快反应速度等优点而备受关注。电润湿电子纸相较于电泳电子纸，同样能实现高亮度、高对比度、低能耗，且在响应速度上快于电泳电子纸，因而成为新一代电子纸显示器的重点研究方向。In recent years, electronic paper display devices have attracted much attention due to their advantages of paper-like appearance, low power consumption, and fast response speed. Compared with electrophoretic electronic paper, electrowetting electronic paper can also achieve high brightness, high contrast, and low energy consumption, and its response speed is faster than electrophoretic electronic paper, so it has become a key research direction for a new generation of electronic paper displays.
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，一次完整的帧显示的像素状态包括打开和关闭两个状态。所述打开状态为：当开始施加像素电压并达到阈值电压后随着电压的增大，电润湿接触角开始发生明显变化直至达到饱和状态，可以观察到明显的光学变化；所述关闭状态为：当施加的像素电压减小时Electrowetting electronic paper is based on the change of the contact angle of two fluids to realize the display switch, and the pixel state of a complete frame display includes two states: on and off. The open state is: when the pixel voltage is applied and reaches the threshold voltage, as the voltage increases, the electrowetting contact angle begins to change significantly until it reaches a saturated state, and obvious optical changes can be observed; the closed state is : When the applied pixel voltage decreases
电润湿的接触角会随之尽量恢复原先状态，但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完全恢复到原来的状态，使得显示器的光学状态亦即显示器的对比度或灰度减小。基于上述问题在设计电润湿电子纸的驱动波形时，驱动波形由两部分组成，分别是驱动脉冲、复位脉冲。驱动脉冲用来显示图像内容；复位脉冲用来使接触角复位并且释放被基板俘获的电荷。The contact angle of electrowetting will then restore to its original state as much as possible, but because the electrons in the electrowetting display fluid are captured by the display substrate, the electrowetting contact angle cannot be completely restored to its original state during the voltage reduction process. The optical state of the display, ie the contrast or gray scale of the display, is reduced. Based on the above problems, when designing the driving waveform of the electrowetting electronic paper, the driving waveform consists of two parts, namely the driving pulse and the reset pulse. The drive pulse is used to display image content; the reset pulse is used to reset the contact angle and release the charge trapped by the substrate.
由于在不同的灰度状态下，基板俘获电荷的程度不同及电润湿接触角复位所需的时间不同，所以需要一个复位脉冲，该复位脉冲能使接触角在电压减小的过程中完全恢复到原来的状态，因此复位脉冲与公共电极的电势差需始终为0，且复位脉冲的持续时间要随着灰度的不同而改变。Since the degree of charge trapping on the substrate is different and the time required for the electrowetting contact angle to reset is different in different gray states, a reset pulse is required, which can fully restore the contact angle during the voltage reduction process. to the original state, so the potential difference between the reset pulse and the common electrode must always be 0, and the duration of the reset pulse changes with the gray scale.
发明内容Contents of the invention
针对上述现有技术的不足，本发明提出一种调整电润湿显示器多灰度显示的驱动方法，改善图像质量和更新时间。In view of the deficiencies in the prior art above, the present invention proposes a driving method for adjusting multi-grayscale display of an electrowetting display to improve image quality and update time.
为实现上述目的，本发明的技术方案是：一种调整电润湿显示器多灰度显示的驱动方法，电润湿显示器的驱动电压波形包括若干个子帧周期，其中最后一个子帧周期对应复位脉冲，其余子帧周期对应驱动脉冲，在驱动时间不变的情况下，设置所述驱动脉冲的子帧脉宽不等且任意排列。In order to achieve the above object, the technical solution of the present invention is: a driving method for adjusting the multi-grayscale display of the electrowetting display, the driving voltage waveform of the electrowetting display includes several subframe periods, and the last subframe period corresponds to the reset pulse , the remaining sub-frame periods correspond to the driving pulses, and in the case of constant driving time, the sub-frame pulse widths of the driving pulses are set to be unequal and arranged arbitrarily.
进一步地，所述复位脉冲的脉宽根据像素灰度值的不同而变化，像素灰度值越大脉宽越大。Further, the pulse width of the reset pulse varies according to the gray value of the pixel, and the larger the gray value of the pixel, the larger the pulse width.
进一步地，所述驱动脉冲的第一个子帧持续时间大于等于tmin，tmin的具体计算方法为：Further, the duration of the first subframe of the driving pulse is greater than or equal to tmin , and the specific calculation method of tmin is:
（1）对电润湿显示器进行测量得到随电压增大反射率变化的曲线V R -R E1 ，得到电润湿显示器的阈值电压 Vth和饱和电压Vmax；(1) Measure the electrowetting display to obtain the curve V R -R E1 of the reflectivity change with the increase of voltage, and obtain the threshold voltage V th and saturation voltage V max of the electrowetting display;
（2）根据电润湿显示器的阈值电压Vth，确定施加到电润湿显示器上子帧最短持续时间tmin。(2) According to the threshold voltage V th of the electrowetting display, determine the shortest duration t min of the subframe applied to the electrowetting display.
进一步地，所述驱动脉冲的每个子帧持续时间小于tmax，根据电润湿显示器的饱和电压Vmax，确定施加到电润湿显示器上子帧最长持续时间tmax。Further, the duration of each subframe of the driving pulse is less than t max , and the longest duration t max of the subframe applied to the electrowetting display is determined according to the saturation voltage V max of the electrowetting display.
进一步地，电润湿显示器像素共同电极的电压固定为+15V，所述驱动脉冲包括三种不同的电压：-15v或0v或15v。Further, the voltage of the common electrode of the pixel of the electrowetting display is fixed at +15V, and the driving pulse includes three different voltages: -15v or 0v or 15v.
进一步地，所述复位脉冲的电压为+15V。Further, the voltage of the reset pulse is +15V.
与现有技术相比，本发明具有有益效果：在总驱动时间不变即不影响刷新率的情况下通过不等脉宽子帧组合的方式提高电润湿电子纸的灰度，从而使电润湿电子纸的显示画面更加丰富细腻。同时在单一不变的的复位子帧的基础上利用像素灰度的不同来决定复位子帧的脉宽大小，从而更好的抑制电润湿电子纸的电荷泄露。Compared with the prior art, the present invention has beneficial effects: the gray level of the electrowetting electronic paper is improved by combining sub-frames with unequal pulse widths while the total driving time remains unchanged, that is, the refresh rate is not affected, so that the electrowetting electronic paper The display screen of wet electronic paper is richer and more delicate. At the same time, on the basis of a single unchanging reset sub-frame, the pulse width of the reset sub-frame is determined by using the difference in pixel gray scale, so as to better suppress the charge leakage of the electrowetting electronic paper.
附图说明Description of drawings
图1是典型电润湿显示器像素结构和显示原理示意图；Figure 1 is a schematic diagram of the pixel structure and display principle of a typical electrowetting display;
图2是典型电润湿显示器油墨平铺时的俯视图；Figure 2 is a top view of a typical electrowetting display ink when it is tiled;
图3是典型电润湿显示器油墨收缩铺时的俯视图；Figure 3 is a top view of a typical electrowetting display ink when it shrinks and spreads;
图4是本发明实施例中电润湿显示器随电压增大反射率变化的曲线示意图V R -R E1 ；Fig. 4 is a schematic diagram V R -R E1 of the change in reflectivity of the electrowetting display as the voltage increases in the embodiment of the present invention;
图5是本发明实施例中电润湿显示器驱动波形对比图。Fig. 5 is a comparative diagram of driving waveforms of an electrowetting display in an embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图及实施例对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
图1是典型电润湿显示器像素结构和显示原理示意图，该结构包括白色衬底、透明电极，疏水涂层、油墨、像素墙。当没有施加驱动电压在像素电极上时，如左侧所示，油墨将平铺在疏水层上，光线通过水层到达油墨，反射后显示油墨的颜色，此时像素定义为关闭状态。当给像素电极施加驱动电压时，如右侧所示，油墨不再铺满整个像素格，而是在界面张力的作用下被推挤到一边，反射基板暴露在自然光下从而反射白色基板的的颜色，此时像素定义为打开状态。图2是油墨平铺时的俯视图；如图3是油墨收缩时的俯视图。油墨收缩的程度和反射光的大小由驱动电压大小决定，当驱动电压低于阈值电压时油墨收缩程度非常小，反之当驱动电压高于阈值电压时油墨收缩程度越大。Figure 1 is a schematic diagram of the pixel structure and display principle of a typical electrowetting display. The structure includes a white substrate, a transparent electrode, a hydrophobic coating, ink, and a pixel wall. When no driving voltage is applied to the pixel electrode, as shown on the left, the ink will be spread on the hydrophobic layer, and the light will reach the ink through the water layer, and the color of the ink will be displayed after reflection. At this time, the pixel is defined as an off state. When a driving voltage is applied to the pixel electrode, as shown on the right, the ink no longer covers the entire pixel grid, but is pushed aside under the action of interfacial tension, and the reflective substrate is exposed to natural light to reflect the color of the white substrate. The color at which the pixel is defined to be in the on state. Fig. 2 is a top view when the ink is tiled; Fig. 3 is a top view when the ink shrinks. The degree of ink shrinkage and the size of reflected light are determined by the driving voltage. When the driving voltage is lower than the threshold voltage, the degree of ink shrinkage is very small. On the contrary, when the driving voltage is higher than the threshold voltage, the degree of ink shrinkage is greater.
图4所示是电润湿显示器随着电压增大时，电润湿显示器的反射率，亦即开口率变化曲线，用来控制电润湿显示器所需显示灰度时的电压大小。Figure 4 shows the change curve of the reflectivity of the electrowetting display, that is, the aperture ratio, as the voltage increases, which is used to control the voltage required for the electrowetting display to display grayscale.
本发明提供一种调整电润湿多灰度显示器多灰度显示的驱动方法，用于调整电润湿显示器的灰度级和灰度精度。The invention provides a driving method for adjusting the multi-grayscale display of an electrowetting multi-grayscale display, which is used for adjusting the grayscale and grayscale precision of the electrowetting display.
在本实施例中，对电润湿电子纸显示器进行测量得到随着电压增大反射率变化的曲线V R -R E1 ，如图4所示，即可得到电润湿的阈值电压Vth和饱和电压Vmax。In this embodiment, the electrowetting electronic paper display is measured to obtain the curve V R -R E1 of the change of reflectivity with the increase of voltage, as shown in Figure 4, the threshold voltage V th and the threshold voltage of electrowetting can be obtained Saturation voltage V max .
根据所得到的电润湿显示器的阈值电压Vth确定驱动脉冲第一个子帧持续时间大于等于tmin，根据所得到的电润湿显示器的饱和电压Vmax确定驱动脉冲每个子帧持续时间小于tmax。According to the obtained threshold voltage V th of the electrowetting display, it is determined that the duration of the first subframe of the driving pulse is greater than or equal to t min , and according to the obtained saturation voltage V max of the electrowetting display, it is determined that the duration of each subframe of the driving pulse is less than t max .
在本实施例中，利用电泳显示源极驱动芯片和电泳显示栅极驱动芯片为电润湿显示器提供驱动波形和扫描信号；所述电润湿显示器像素共同电极的电压固定为+15V；驱动波形中包含多个驱动脉冲；驱动脉冲的驱动电压包括三种：-15v或0v或15v。In this embodiment, an electrophoretic display source driver chip and an electrophoretic display gate driver chip are used to provide driving waveforms and scanning signals for the electrowetting display; the voltage of the common electrode of the pixel of the electrowetting display is fixed at +15V; the driving waveform Contains a plurality of driving pulses; the driving voltage of the driving pulse includes three types: -15v or 0v or 15v.
图5所示是本实施例电润湿显示器驱动波形对比图，其中上侧是普通的非对称动态驱动波形图，下侧是本发明调整后的不等脉宽子帧组合驱动电压波形，驱动电压波形包含5个子帧周期，其中子帧1~子帧4四个周期直接驱动像素点的图像帧，使得当前像素点显示对应灰阶。复位脉冲保持脉宽长度不变。下侧是针对上侧普通驱动波形的调整，在驱动周期不变的情况下，将原子帧1~子帧4的驱动脉冲采用脉宽不等的子帧进行随机组合，在本实施例中，如图3是在后两个子帧处采用1：2的长短的子帧进行组合，驱动脉冲的不等子帧脉宽小于tmax且第一个子帧的脉宽大于等于tmin，从而在原来的的对应像素点灰度和刷新率不变的情况下调整后的波形使图像的灰阶更高，图像细节部分显示的更加细腻丰富。本发明改进后的复位脉冲脉宽根据像素灰度的不同进行改变，这样能更好的抑制电荷泄露。Figure 5 is a comparative diagram of driving waveforms of the electrowetting display in this embodiment, wherein the upper side is a common asymmetric dynamic driving waveform diagram, and the lower side is the adjusted driving voltage waveform of the unequal pulse width sub-frame combination of the present invention. The voltage waveform includes 5 subframe periods, of which the four periods of subframe 1 to subframe 4 directly drive the image frame of the pixel, so that the current pixel displays the corresponding gray scale. The reset pulse keeps the pulse width length unchanged. The lower side is for the adjustment of the normal driving waveform on the upper side. Under the condition that the driving period remains unchanged, the driving pulses of atomic frame 1 to subframe 4 are randomly combined with subframes with different pulse widths. In this embodiment, As shown in Figure 3, the subframes with a length of 1:2 are used for combination at the last two subframes. The pulse width of the unequal subframe of the driving pulse is less than t max and the pulse width of the first subframe is greater than or equal to t min . The adjusted waveform makes the gray scale of the image higher, and the details of the image are displayed more delicately and richly. The improved reset pulse width of the present invention is changed according to the gray scale of the pixel, which can better suppress charge leakage.
需要说明的是，驱动脉冲中脉宽不等的子帧结合的方式和脉宽的持续时间是任意的，本发明中除了如图3的组合方式，其他组合方式也适用于调整电润湿多灰度显示的驱动方法。It should be noted that the combination of subframes with different pulse widths in the driving pulse and the duration of the pulse width are arbitrary. In the present invention, in addition to the combination shown in Figure 3, other combinations are also suitable for adjusting the electrowetting multiple Drive method for grayscale display.
以上所述仅为本发明的较佳实施例，凡依本发明申请专利范围所做的均等变化与修饰，皆应属本发明的涵盖范围。The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.
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| CN108648701A (en) * | 2018-05-25 | 2018-10-12 | 福州大学 | A kind of method and device reducing the reflux of electrowetting Electronic Paper ink |
| CN108766370A (en) * | 2018-06-11 | 2018-11-06 | 深圳市国华光电科技有限公司 | A kind of electrowetting drive system and its control method |
| CN116129819A (en) * | 2022-12-23 | 2023-05-16 | 华南师范大学 | Electrowetting electronic paper drive method, system and storage medium based on AC drive |
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| CN116129819B (en) * | 2022-12-23 | 2025-01-14 | 华南师范大学 | Method, system and storage medium for driving electrowetting electronic paper based on alternating current driving |
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