技术领域technical field
本发明涉及电泳显示屏领域，特别涉及一种改进电泳显示器激活模式的驱动方法。The invention relates to the field of electrophoretic display screens, in particular to a driving method for improving the activation mode of the electrophoretic display screen.
背景技术Background technique
微胶囊电泳显示已成为重要的电子纸显示技术，与其他显示技术相比，具有超低功耗的优点，因此电泳显示技术被广泛应用。微胶囊中有两种颗粒：黑色颗粒和白色颗粒。白色颗粒受负电荷控制，黑色颗粒受正电荷控制。所以，当像素电极提供负电压电泳显示器显示白色，而正电压驱动时则显示黑色。电泳显示器需要一个有源矩阵背板，为了驱动电泳颗粒来实现灰阶的正确显示，在电极上施加合适的驱动波形。迄今为止，已经有很多有关电泳显示的驱动波形的研究。Microcapsule electrophoretic display has become an important electronic paper display technology. Compared with other display technologies, it has the advantage of ultra-low power consumption, so electrophoretic display technology is widely used. There are two kinds of particles in the microcapsules: black particles and white particles. White particles are governed by negative charges and black particles by positive charges. Therefore, when the pixel electrode is supplied with a negative voltage, the electrophoretic display displays white, and when driven with a positive voltage, it displays black. The electrophoretic display needs an active matrix backplane. In order to drive the electrophoretic particles to achieve the correct display of the gray scale, a suitable driving waveform is applied to the electrodes. So far, there have been many studies on driving waveforms of electrophoretic displays.
一般通过查询表的方式直接根据所转变的最终灰度值施加一驱动电压控制像素显示相应的灰度值，然而由于电光显示器具有历史依赖性，即会有残留电压等的影响，因此通过直接查询表驱动的方式很难实现灰度的精准控制，造成一定误差。在灰度控制过程中，如果某一像素长期不能回到极端光学状态(即黑或白)，则误差会越来越大，另外，在对灰度控制施加驱动电压时，有必要保持直流平衡，否则会损坏电极以及显示介质。Generally, a driving voltage is directly applied to control the pixel to display the corresponding gray value by means of a look-up table according to the converted final gray value. The meter-driven approach is difficult to achieve precise control of the gray scale, resulting in certain errors. In the process of grayscale control, if a certain pixel cannot return to the extreme optical state (that is, black or white) for a long time, the error will become larger and larger. In addition, when applying the driving voltage to the grayscale control, it is necessary to maintain a DC balance , otherwise it will damage the electrode and the display medium.
目前，传统驱动波形包括四个阶段：擦除原始图像、重新设置为黑色状态、清除到白色状态和写入新图像。这过程仅能稍微减少重影图像，但效果不是很好并且会产生闪烁。传统驱动波形示意图如图1所示，传统驱动波形驱动过程示意图如图2所示。根据前一个第四阶段，第一阶段采用达到直流平衡的电压。应用极性相反的驱动电压来擦除当前图像，持续时间te与在上次驱动循环中驱动图像到当前状态是一样的。第二和第三阶段用于激活颗粒。在第一阶段结束时，电泳显示器应写入到一个统一的白色状态，但实际情况是由于材料本身的原因，不是全部电泳微粒在相应的预定电压下都完全同样行动，即使是施加预定的电压，也会有未充分移动到预期的位置的微粒或者即使是暂时移动了预定距离但由于分散液的对流而再次沉降或浮起的微粒，因此，电泳显示器可能在驱动波形结束时显示重影图像、残像或者灰度不均等图像，如图3所示。第四阶段写入新的图像，持续时间tw，由于受前三个阶段的影响，新的图像有重影，对人眼舒适阅读产生负面影响。Currently, the conventional drive waveform consists of four phases: erasing the original image, resetting to a black state, clearing to a white state, and writing a new image. This process only slightly reduces ghost images, but not very well and produces flickering. The schematic diagram of the traditional driving waveform is shown in Figure 1, and the schematic diagram of the driving process of the traditional driving waveform is shown in Figure 2. According to the previous fourth stage, the first stage uses a voltage that achieves DC balance. The current image is erased by applying a drive voltage of opposite polarity for the same duration te that the image was driven to the current state in the last drive cycle. The second and third stages are used to activate the particles. At the end of the first stage, the electrophoretic display should be written to a uniform white state, but the reality is that due to the material itself, not all electrophoretic particles behave exactly the same at the corresponding predetermined voltage, even when the predetermined voltage is applied , there may also be particles that have not moved sufficiently to the expected position or particles that have moved a predetermined distance temporarily but have settled or floated again due to the convection of the dispersion liquid, therefore, the electrophoretic display may display a ghost image at the end of the driving waveform , afterimages, or images with uneven gray levels, as shown in Figure 3. The fourth stage writes a new image with a duration of tw . Due to the influence of the first three stages, the new image has ghosting, which has a negative impact on the comfortable reading of the human eye.
为了解决这个问题，科学家们提出了一些方法。一种方法是将四种屏幕更新模式用于更新显示，这种更新显示是根据需要，更新在电泳显示的图像资料，它可以改善更新速度和减少在某些特定情况下的闪烁次数。然而，这种方法仅仅更改屏幕刷新模式，不可能从始至终地减少闪烁。To solve this problem, scientists have proposed some methods. One method is to use four screen update modes for updating the display, which updates the image data displayed on the electrophoretic display according to needs, which can improve the update speed and reduce the number of flickering in some specific situations. However, this method only changes the screen refresh mode, and it is impossible to reduce the flicker all the way.
发明内容Contents of the invention
本发明实施例提供了一种改进电泳显示器激活模式的驱动方法，以减少电泳显示器的闪烁。The embodiment of the present invention provides a driving method for improving the activation mode of the electrophoretic display, so as to reduce the flickering of the electrophoretic display.
本发明实施例提供了一种改进电泳显示器激活模式的驱动方法，在器件显示像素的驱动电极上施加高频脉冲电压以实现显示驱动，所述高频脉冲电压施加在用于写入新图像的脉冲电压之前。An embodiment of the present invention provides a driving method for improving the activation mode of an electrophoretic display. A high-frequency pulse voltage is applied to the driving electrode of the display pixel of the device to realize display driving. The high-frequency pulse voltage is applied to the electrode for writing a new image. before the pulse voltage.
进一步地，所述高频脉冲电压为高于25Hz的脉冲电压。Further, the high-frequency pulse voltage is a pulse voltage higher than 25 Hz.
进一步地，所述高频脉冲电压为方波电压。Further, the high-frequency pulse voltage is a square wave voltage.
进一步地，所述驱动方法采用黑色灰阶为参考灰度。Further, the driving method adopts the black gray scale as the reference gray scale.
进一步地，所述施加高频脉冲电压之前还包括：施加遵守直流平衡的复位电压脉冲。Further, before applying the high-frequency pulse voltage, it also includes: applying a reset voltage pulse complying with DC balance.
进一步地，所述遵守直流平衡的复位电压脉冲包括第一时间长度的负电压和第二时间长度的正电压。Further, the reset voltage pulse complying with DC balance includes a negative voltage for a first time length and a positive voltage for a second time length.
进一步地，所述第一时间长度为T-t1，所述T为黑屏至白屏施加电压所需时间，所述t1为写入原始图像施加电压所需时间。Further, the first time length is Tt1 , the T is the time required to apply the voltage from the black screen to the white screen, and the t1 is the time required to write the original image with the applied voltage.
进一步地，所述第二时间长度为T，所述T为黑屏至白屏施加电压所需时间。Further, the second time length is T, and T is the time required for applying voltage from a black screen to a white screen.
一种波形发生器，所述波形发生器周期性地产生脉冲电压波形，所述脉冲电压波形包括用于驱动器件显示像素的驱动电极的高频脉冲电压、用于写入新图像的脉冲电压以及遵守直流平衡的复位电压脉冲，时序上所述高频脉冲电压发生在所述用于写入新图像的脉冲电压之前，所述复位电压脉冲发生在所述高频脉冲电压之前。A waveform generator that periodically generates a pulse voltage waveform including a high-frequency pulse voltage for driving a drive electrode of a display pixel of a device, a pulse voltage for writing a new image, and Observing DC balanced reset voltage pulses, the high-frequency pulse voltage occurs before the pulse voltage for writing a new image in timing, the reset voltage pulse occurs before the high-frequency pulse voltage.
进一步地，所述高频脉冲电压为高于25Hz的脉冲电压；所述第二时间长度为T，所述高频脉冲电压为方波电压。Further, the high-frequency pulse voltage is a pulse voltage higher than 25 Hz; the second time length is T, and the high-frequency pulse voltage is a square wave voltage.
本发明提供的技术方案带来的有益效果是：The beneficial effects brought by the technical scheme provided by the invention are:
从上述本发明实施例可知，由于施加高频脉冲实现显示驱动，高频电压的频率大于人眼能够察觉到的频率，减少了电泳显示器的闪烁。It can be seen from the above embodiments of the present invention that, since display driving is realized by applying high-frequency pulses, the frequency of the high-frequency voltage is higher than the frequency that can be detected by human eyes, thereby reducing the flickering of the electrophoretic display.
附图说明Description of drawings
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.
图1为传统驱动波形示意图；Figure 1 is a schematic diagram of a traditional drive waveform;
图2为传统驱动波形驱动过程示意图；Fig. 2 is a schematic diagram of a traditional driving waveform driving process;
图3为重影图像示意图；Fig. 3 is a schematic diagram of a ghost image;
图4为本发明第一实施例驱动波形示意图；4 is a schematic diagram of driving waveforms in the first embodiment of the present invention;
图5为本发明第一实施例驱动波形驱动过程示意图；FIG. 5 is a schematic diagram of a driving waveform driving process according to the first embodiment of the present invention;
图6为本发明第二实施例驱动波形示意图；6 is a schematic diagram of driving waveforms according to the second embodiment of the present invention;
图7为本发明第二实施例驱动波形驱动过程示意图。FIG. 7 is a schematic diagram of the driving process of the driving waveform according to the second embodiment of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明实施方式作进一步地详细描述。In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
实施例一Embodiment one
本发明实施例一提供了一种改进电泳显示器激活模式的驱动方法，在器件显示像素的驱动电极上施加高频脉冲电压以实现显示驱动，所述高频脉冲电压施加在用于写入新图像的脉冲电压之前。Embodiment 1 of the present invention provides a driving method for improving the activation mode of an electrophoretic display. A high-frequency pulse voltage is applied to the driving electrode of the display pixel of the device to realize display driving. The high-frequency pulse voltage is applied to the drive electrode for writing a new image. before the pulse voltage.
高频脉冲电压的驱动波形参见图4，在写入原始图像之后，在器件显示像素的驱动电极上施加高频脉冲电压激活微胶囊中的颗粒，所述高频脉冲电压为高于25Hz的脉冲电压，所述高频脉冲电压可以为方波电压。施加高频脉冲电压之后，施加负电压写入新图像。The drive waveform of the high-frequency pulse voltage is shown in Figure 4. After the original image is written, a high-frequency pulse voltage is applied to the drive electrode of the display pixel of the device to activate the particles in the microcapsules. The high-frequency pulse voltage is a pulse higher than 25 Hz Voltage, the high-frequency pulse voltage may be a square wave voltage. After applying high-frequency pulse voltage, a negative voltage is applied to write a new image.
高频脉冲电压的驱动波形驱动过程参见图5，施加高频脉冲电压之后，屏幕为黑屏。本发明采用黑色灰阶为参考灰度，即施加用于写入新图像的脉冲电压前屏幕为黑屏。采用黑色灰阶为参考灰度时，写入新图像所施加电压为负电压。本实施例中，用四级灰度驱动波形作为一个示例，但本文中驱动波形的设计方法适用于多级灰度驱动波形。The driving process of the high-frequency pulse voltage driving waveform is shown in Figure 5. After the high-frequency pulse voltage is applied, the screen is black. The present invention adopts the black gray scale as the reference gray scale, that is, the screen is black before the pulse voltage for writing a new image is applied. When the black gray scale is used as the reference gray scale, the applied voltage for writing a new image is a negative voltage. In this embodiment, four-level gray-scale driving waveforms are used as an example, but the design method of driving waveforms herein is applicable to multi-level gray-scale driving waveforms.
本发明采用黑色灰阶为参考灰度。如果采取白色灰阶作为参照，白色状态可能会随着驱动一个高频脉冲电压变暗，电泳显示可能会丢失的参考灰度级。所以，本发明中，黑色灰阶用作参考灰度，用于写入新图像所施加电压为负电压。The present invention adopts the black gray scale as the reference gray scale. If the white gray scale is taken as a reference, the white state may become darker as it is driven by a high-frequency pulse voltage, and the electrophoretic display may lose the reference gray scale. Therefore, in the present invention, the black gray scale is used as a reference gray scale, and the applied voltage for writing a new image is a negative voltage.
本实施例通过施加高频脉冲实现显示驱动，高频电压的频率大于人眼能够察觉到的频率，减少了电泳显示器的闪烁。In this embodiment, the display is driven by applying high-frequency pulses, and the frequency of the high-frequency voltage is higher than the frequency that can be detected by human eyes, thereby reducing the flickering of the electrophoretic display.
实施例二Embodiment two
结合本发明实施例一，在施加高频脉冲电压之前施加遵守直流平衡的复位电压脉冲，如图6所示。In combination with Embodiment 1 of the present invention, before applying the high-frequency pulse voltage, a reset voltage pulse complying with DC balance is applied, as shown in FIG. 6 .
在写入原始图像之后，施加遵守直流平衡的复位电压脉冲，所述遵守直流平衡的复位电压脉冲包括第一时间长度的负电压和第二时间长度的正电压。After the original image is written, a DC balanced reset voltage pulse including a negative voltage for a first time length and a positive voltage for a second time length is applied.
所述第一时间长度为T-t1；所述T为黑屏至白屏施加电压所需时间，t1为写入原始图像施加电压所需时间。例如，黑屏至白屏施加电压所需时间为120ms，写入原始图像施加电压所需时间为80ms，则第一时间长度为40ms，复位电压脉冲包括第一时间长度为40ms的负电压。The first time length is Tt1 ; the T is the time required for applying voltage from black screen to white screen, and t1 is the time required for writing original image and applying voltage. For example, the time required to apply voltage from black screen to white screen is 120ms, and the time required to apply voltage to write original image is 80ms, then the first time length is 40ms, and the reset voltage pulse includes a negative voltage with a first time length of 40ms.
参见图7，施加第一时间长度的负电压后，屏幕为白屏。Referring to FIG. 7 , after applying the negative voltage for the first time length, the screen is blank.
所述第二时间长度为T；所述T为黑屏至白屏施加电压所需时间。例如，黑屏至白屏施加电压所需时间为120ms，则第二时间长度为120ms，复位电压脉冲包括第二时间长度为120ms的正电压。The second time length is T; the T is the time required for applying a voltage from a black screen to a white screen. For example, the time required to apply a voltage from a black screen to a white screen is 120 ms, then the second time length is 120 ms, and the reset voltage pulse includes a positive voltage with a second time length of 120 ms.
参见图7，施加第二时间长度的正电压后，屏幕为黑屏。Referring to FIG. 7 , after applying the positive voltage for the second time length, the screen is black.
因此，当黑屏至白屏施加电压所需时间为120ms，写入原始图像施加电压所需时间为80ms，则复位电压脉冲包括第一时间长度为40ms的负电压和第二时间长度为120ms的正电压。Therefore, when the time required to apply the voltage from the black screen to the white screen is 120ms, and the time required to apply the voltage to write the original image is 80ms, then the reset voltage pulse includes a negative voltage with a first duration of 40ms and a positive voltage with a second duration of 120ms. Voltage.
施加遵守直流平衡的复位电压脉冲后，在器件显示像素的驱动电极上施加高频脉冲电压以实现显示驱动，所述高频脉冲电压施加在用于写入新图像的脉冲电压之前。After applying a DC balanced reset voltage pulse, a high-frequency pulse voltage is applied to the drive electrodes of the display pixels of the device to realize display driving. The high-frequency pulse voltage is applied before the pulse voltage for writing a new image.
参见图6，在施加遵守直流平衡的复位电压脉冲后，在器件显示像素的驱动电极上施加高频脉冲电压激活微胶囊中的颗粒，所述高频脉冲电压为高于25Hz的脉冲电压，所述高频脉冲电压可以为方波电压。施加高频脉冲电压之后，施加负电压写入新图像。Referring to Fig. 6, after applying the reset voltage pulse complying with the DC balance, a high-frequency pulse voltage is applied on the drive electrode of the display pixel of the device to activate the particles in the microcapsules, and the high-frequency pulse voltage is a pulse voltage higher than 25 Hz, so The high-frequency pulse voltage can be a square wave voltage. After applying high-frequency pulse voltage, a negative voltage is applied to write a new image.
参见图7，施加高频脉冲电压之后，屏幕为黑屏。本发明采用黑色灰阶为参考灰度，即施加写入新图像的脉冲电压前屏幕为黑屏。采用黑色灰阶为参考灰度时，写入新图像所施加电压为负电压。本实施例中，用四级灰度驱动波形作为一个示例，但本文中驱动波形的设计方法是适用于多级灰度驱动波形。Referring to Figure 7, after the high-frequency pulse voltage is applied, the screen is black. The present invention adopts the black gray scale as the reference gray scale, that is, the screen is black before the pulse voltage for writing a new image is applied. When the black gray scale is used as the reference gray scale, the applied voltage for writing a new image is a negative voltage. In this embodiment, a four-level gray-scale driving waveform is used as an example, but the driving waveform design method herein is applicable to multi-level gray-scale driving waveforms.
本发明采用黑色灰阶为参考灰度。如果采取白色灰阶作为参照，白色状态可能会随着驱动一个高频脉冲电压变暗，电泳显示可能会丢失的参考灰度级。所以，本发明中，黑色灰阶用作参考灰度，写入新图像所施加电压为负电压。The present invention adopts the black gray scale as the reference gray scale. If the white gray scale is taken as a reference, the white state may become darker as it is driven by a high-frequency pulse voltage, and the electrophoretic display may lose the reference gray scale. Therefore, in the present invention, the black gray scale is used as a reference gray scale, and the applied voltage for writing a new image is a negative voltage.
如图6所示，复位电压脉冲和高频脉冲电压之前写入图像的脉冲为写入原始图像脉冲，复位电压脉冲和高频脉冲电压之后写入图像的脉冲为写入新图像脉冲，其中，写入原始图像脉冲时间为t1。As shown in Figure 6, the pulse written into the image before the reset voltage pulse and the high-frequency pulse voltage is to write the original image pulse, and the pulse written into the image after the reset voltage pulse and the high-frequency pulse voltage is to write a new image pulse, wherein, The pulse time for writing the original image is t1 .
本发明实施例还提供一种波形发生器，所述波形发生器周期性地产生脉冲电压波形，所述脉冲电压波形包括用于驱动器件显示像素的驱动电极的高频脉冲电压、用于写入新图像的脉冲电压以及遵守直流平衡的复位电压脉冲，时序上所述高频脉冲电压发生在所述用于写入新图像的脉冲电压之前，所述复位电压脉冲发生在所述高频脉冲电压之前。所述脉冲电压波形如图6所示，写入新图像的脉冲电压之前为高频脉冲电压，高频脉冲电压之前为复位电压脉冲。The embodiment of the present invention also provides a waveform generator, the waveform generator periodically generates pulse voltage waveforms, the pulse voltage waveforms include high-frequency pulse voltages for driving the drive electrodes of the display pixels of the device, and for writing The pulse voltage of the new image and the reset voltage pulse complying with DC balance, the high-frequency pulse voltage occurs before the pulse voltage for writing a new image in timing, and the reset voltage pulse occurs before the high-frequency pulse voltage Before. The waveform of the pulse voltage is shown in FIG. 6 . Before the pulse voltage for writing a new image is a high-frequency pulse voltage, and before the high-frequency pulse voltage is a reset voltage pulse.
在上述波形发生器的实施例中，高频脉冲电压为高于25Hz的脉冲电压，第二时间长度为T，高频脉冲电压为方波电压，高频脉冲电压波形参见图6。In the above embodiment of the waveform generator, the high-frequency pulse voltage is a pulse voltage higher than 25 Hz, the second time length is T, the high-frequency pulse voltage is a square wave voltage, and the waveform of the high-frequency pulse voltage is shown in FIG. 6 .
本实施例通过施加高频脉冲实现显示驱动，高频电压的频率大于人眼能够察觉到的频率，减少了电泳显示器的闪烁，同时在施加高频脉冲前施加遵守直流平衡的复位电压脉冲，减少了重影的现象。In this embodiment, the display is driven by applying high-frequency pulses. The frequency of the high-frequency voltage is greater than the frequency that can be detected by the human eye, which reduces the flickering of the electrophoretic display. ghosting phenomenon.
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740263.1ACN103680426B (en) | 2013-12-27 | 2013-12-27 | A kind of driving method improving activation mode of electrophoretic display |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740263.1ACN103680426B (en) | 2013-12-27 | 2013-12-27 | A kind of driving method improving activation mode of electrophoretic display |
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| CN103680426A CN103680426A (en) | 2014-03-26 |
| CN103680426Btrue CN103680426B (en) | 2015-12-30 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201310740263.1AActiveCN103680426B (en) | 2013-12-27 | 2013-12-27 | A kind of driving method improving activation mode of electrophoretic display |
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