A driving method for a double-layer ink electrowetting electronic paper display

Abstract

The present invention discloses a method for driving a dual-layer ink electrowetting electronic paper display, comprising: obtaining the desired display color for each dual-layer ink pixel in the electronic paper display in response to a display signal; obtaining the corresponding upper primary color ink aperture ratio and lower black ink aperture ratio for each dual-layer ink pixel based on the desired display color; determining whether the lower black ink aperture ratio is zero; if so, applying a voltage to a first primary color drive electrode for driving; if not, applying a diffusion potential to the first black drive electrode and a gathering potential to the second black drive electrode to cause the lower black ink to gather above the second black drive electrode; wherein the hydrophobicity of the lower black ink corresponding to the diffusion potential is less than the gathering potential; and then applying voltages to the first primary color drive electrode and the second black drive electrode, respectively, based on the upper primary color ink aperture ratio and the lower black ink aperture ratio. The present invention can improve display effects.

Description

Technical Field

[0001] The present invention relates to the field of electronic paper display, and in particular to a driving method for a double-layer ink electrowetting electronic paper display. Background Art

[0002] The flexibility of display panels is a major development trend in emerging display technologies. Electronic paper display technology, with its ultra-low power consumption and comfortable viewing in outdoor lighting conditions, is an ideal platform for portable and wearable flexible display terminals. Therefore, its flexibility is a hot topic in international research. In recent years, electronic paper display devices have attracted attention due to their low power consumption and environmentally friendly nature, as they can display through reflected light. Compared to conventional electrophoretic electronic paper, electrowetting electronic paper offers faster response times and color display, making it an ideal electronic paper display for high-resolution video playback.

[0003] Electrowetting e-paper display technology changes the state of display pixels by applying a voltage between electrodes, causing the ink to contract or expand. This rapid pixel switching enables high-resolution video playback. Compared to traditional LCD displays, which rely on backlights that consume 90% of their energy and have inefficient reflective layers, electrowetting technology eliminates the need for a backlight and boasts a reflective layer efficiency of up to 40%, resulting in lower power consumption. Furthermore, electrowetting utilizes an oil film as a raw material, eliminating the complex chemical components used in LCDs. This makes it more stable in extreme environments, such as low temperatures. Electrowetting display panels utilize ambient light for display, making them particularly suitable for electronic devices frequently used in sunlight. Electrowetting panels also offer advantages such as a simple structure, flexible display capabilities, high brightness, high contrast, and a wide viewing angle.

[0004] Most existing electrowetting electronic paper displays use a single-layer ink structure, which results in insufficiently rich display colors and poor display quality. Therefore, electrowetting electronic paper displays with a dual-layer ink structure have emerged. This dual-layer ink structure uses an upper layer of RGB primary color inks and a bottom layer of black ink for comprehensive color development, producing richer colors and enhancing the display quality. However, in existing dual-layer inks, the upper primary color inks and the lower black ink are superimposed and corresponding. When the aperture ratio of both is non-zero, the upper primary color inks expand, and the lower black ink must also expand, resulting in an overlapping display area. This superposition will make the original upper primary color inks darker, which is not as expected, resulting in a reduced display quality. Summary of the Invention

[0005] In view of some of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a driving method for a double-layer ink electrowetting electronic paper display, aiming to improve the display effect of the double-layer ink electrowetting electronic paper display.

[0006] To achieve the above objectives, the present invention provides a driving method for a double-layer ink electrowetting electronic paper display, the method comprising:

[0007] Step S1: In response to a picture display signal, obtaining a required display color corresponding to the picture display signal for each double-layer ink pixel in the electronic paper display; wherein the double-layer ink pixel is a rectangular structure, including a lower white hydrophobic layer, a lower black ink layer is disposed above the lower white hydrophobic layer, a first black drive electrode is disposed at a first corner below the lower white hydrophobic layer, a second black drive electrode is disposed at a second corner below the lower white hydrophobic layer and diagonally opposite to the first corner, a fluid common electrode is disposed above the lower black ink layer, an upper primary color ink layer is disposed above the fluid common electrode, an upper transparent hydrophobic layer is disposed on the upper primary color ink layer, and a first primary color drive electrode is disposed at a third corner above the upper transparent hydrophobic layer and corresponding to the first corner; when the double-layer ink pixel is not driven, the lower black ink layer has the highest hydrophobicity and is concentrated above the first black drive electrode, and the upper primary color ink layer has the highest hydrophobicity and is concentrated below the first primary color drive electrode;

[0008] Step S2: obtaining an upper primary color ink opening ratio and a lower black ink opening ratio corresponding to each of the double-layer ink pixels according to the required display color of each of the double-layer ink pixels;

[0009] Step S3: Determine whether the opening ratio of the lower black ink layer is zero. If so, apply voltage to the first primary color driving electrode to drive the first primary color driving electrode normally, so that the color corresponding to the upper primary color ink is expanded and matched with the white color of the lower white hydrophobic layer to achieve the required display color; if not, proceed to step S4;

[0010] Step S4: applying a diffusion potential to the first black driving electrode and a gathering potential to the second black driving electrode, so that the lower layer of black ink is gathered above the second black driving electrode; wherein the hydrophobicity of the lower layer of black ink corresponding to the diffusion potential is less than that of the gathering potential;

[0011] Step S5: According to the opening ratio of the upper primary color ink and the opening ratio of the lower black ink, voltages are applied to the first primary color driving electrode and the second black driving electrode respectively, so that the colors corresponding to the upper primary color ink and the lower black ink are expanded, and the color ratio is matched with the white color of the lower white hydrophobic layer to achieve the required display color.

[0012] Optionally, the double-layer ink pixels are divided into red double-layer ink pixels, green double-layer ink pixels and blue double-layer ink pixels according to the colors corresponding to the upper primary color inks. The double-layer ink pixels of three different colors constitute a pixel group for three-primary color combination display.

[0013] Optionally, the hydrophobicity of the upper primary color ink is proportional to the applied voltage. When the double-layer ink pixel is not driven, a voltage greater than a first threshold is applied to the first primary color driving electrode to maximize the hydrophobicity of the upper primary color ink and gather under the first primary color driving electrode.

[0014] Optionally, the hydrophobicity of the upper primary color ink is inversely proportional to the applied voltage. When the double-layer ink pixel is not driven, zero voltage is applied to the first primary color driving electrode so that the hydrophobicity of the upper primary color ink reaches the highest level and gathers under the first primary color driving electrode.

[0015] Optionally, the hydrophobicity of the lower layer of black ink is proportional to the applied voltage. When the double-layer ink pixel is not driven, a voltage greater than the second threshold is applied to the first black driving electrode to maximize the hydrophobicity of the lower layer of black ink and gather above the first black driving electrode.

[0016] Optionally, the hydrophobicity of the lower black ink is inversely proportional to the applied voltage. When the double-layer ink pixel is not driven, zero voltage is applied to the first black driving electrode to maximize the hydrophobicity of the lower black ink and gather above the first black driving electrode.

[0017] Optionally, after step S5, the method further includes:

[0018] In response to display completion, the gathering potential is applied to the first black driving electrode, and the diffusion potential is applied to the second black driving electrode, so that the lower layer of black ink is restored to gather above the first black driving electrode.

[0019] Beneficial effects of the present invention: The present invention sets a first black driving electrode at a first corner below the lower white hydrophobic layer, and sets a second black driving electrode at a second corner below the lower white hydrophobic layer that is diagonally opposite to the first corner. When the opening ratio of the lower black ink is not zero, a diffusion potential is applied to the first black driving electrode, and a gathering potential is applied to the second black driving electrode, so that the lower black ink is gathered above the second black driving electrode; according to the opening ratio of the upper primary color ink and the opening ratio of the lower black ink, voltages are applied to the first primary color driving electrode and the second black driving electrode respectively, so that the colors corresponding to the upper primary color ink and the lower black ink are expanded, and the color ratio is matched with the white color of the lower white hydrophobic layer to achieve the required display color. The present invention reduces the overlapping display area of ​​the upper primary color ink and the lower black ink during the driving process by adding the second black driving electrode, thereby avoiding the interference of the color development of the upper primary color ink by the lower black ink, thereby enhancing the display effect and improving the display quality. At the same time, the first black driving electrode of the present invention can ensure that the opening ratio of the lower black ink is not zero, and the hydrophobicity of the lower black ink reaches the highest and gathers above the first black driving electrode. In this way, the area in the lower white hydrophobic layer that is color-matched with the upper primary color ink is not occupied, so that the lower black ink does not appear in this area and affect the display effect.

[0020] In summary, the present invention can effectively enhance the display effect and improve the display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of a method for driving a double-layer ink electrowetting electronic paper display provided by a specific embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of a double-layer oil display pixel structure provided by a specific embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a top view of a double-layer oil display pixel provided by the prior art;

[0024] Figure 4 This is a schematic top view of a double-layer oil display pixel provided by a specific embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of a front view display of a double-layer oil display pixel provided by the prior art;

[0026] Figure 6 1 is a schematic diagram of a front view of a double-layer oil display pixel provided by a specific embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the movement process of black ink provided by a specific embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention discloses a method for driving a dual-layer ink electrowetting electronic paper display. Those skilled in the art may refer to the contents of this document and appropriately improve the technical details for implementation. It is particularly important to note that all similar substitutions and modifications that would be obvious to those skilled in the art are considered to be included in the present invention. The methods and applications of the present invention have been described through preferred embodiments. It is obvious that those skilled in the art can modify or appropriately alter and combine the methods and applications described herein to implement and apply the technology of the present invention without departing from the content, spirit, and scope of the present invention.

[0029] The applicant's research has found that most existing electrowetting electronic paper displays use a single-layer ink structure, which results in insufficiently rich display colors and poor display quality. Therefore, electrowetting electronic paper displays with a double-layer ink structure have emerged. This double-layer ink structure uses an upper layer of RGB primary ink and a bottom layer of black ink for comprehensive color development, producing richer colors and enhancing the display effect. However, in existing double-layer inks, the upper primary ink and the lower black ink converge at corresponding positions. When the aperture ratios of both are non-zero, the upper primary ink expands, and the lower black ink must also expand, resulting in an overlapping display area. This overlapping effect darkens the original color of the upper primary ink, which is not as expected, resulting in a reduced display effect.

[0030] Therefore, the embodiment of the present invention provides a double-layer ink electrowetting electronic paper display driving method, such as Figure 1 As shown, the method includes:

[0031] Step S1: In response to a picture display signal, obtaining a required display color corresponding to each double-layer ink pixel in the electronic paper display and the picture display signal.

[0032] Among them, the double-layer ink pixel is a rectangular structure, including a lower white hydrophobic layer, a lower black ink layer is arranged above the lower white hydrophobic layer, a first black driving electrode is arranged at the first corner below the lower white hydrophobic layer, a second black driving electrode is arranged at the second corner below the lower white hydrophobic layer which is diagonally opposite to the first corner, a fluid common electrode is arranged above the lower black ink, an upper primary color ink is arranged above the fluid common electrode, an upper transparent hydrophobic layer is arranged on the upper primary color ink, and a first primary color driving electrode is arranged at the third corner above the upper transparent hydrophobic layer corresponding to the first corner; when the double-layer ink pixel is not driven, the hydrophobicity of the lower black ink reaches the highest and is gathered above the first black driving electrode, and the hydrophobicity of the upper primary color ink reaches the highest and is gathered below the first primary color driving electrode.

[0033] It's important to note that the dual-layer ink structure shifts grayscale variation from a reflection driven by the aperture ratio of the primary inks to a grayscale variation achieved by a combination of the aperture ratios of the primary and black inks. This allows for a richer grayscale gradient. For example, while primary inks alone previously only allowed for a transition from white to green, the dual-layer ink structure now allows for a gradual transition from green to black, such as a dark green.

[0034] In this specific embodiment, the double-layer ink pixels are divided into red double-layer ink pixels, green double-layer ink pixels and blue double-layer ink pixels according to the colors corresponding to the upper primary color inks. The three double-layer ink pixels of different colors constitute a pixel group for three-primary color combination display.

[0035] Furthermore, the structure of the three primary colors double-layer ink pixel can be as follows Figure 2 As shown, 221 is the lower white hydrophobic layer, 222 is the lower black ink, 223 is the first black driving electrode, 224 is the second black driving electrode, 225 is the fluid common electrode, 226 is the upper primary color ink, 227 is the upper transparent hydrophobic layer, and 228 is the first primary color driving electrode. Figure 2 It is a double-layer ink pixel corresponding to the three primary colors. From the left, the first grid is the state when both the lower black ink 222 and the upper primary color ink 226 are driven; the second grid is the state when only the upper primary color ink 226 is driven; the third grid is the state when none of the upper primary color inks 226 are driven.

[0036] Step S2: according to the required display color of each double-layer ink pixel, obtain the upper primary color ink opening ratio and the lower black ink opening ratio corresponding to each double-layer ink pixel.

[0037] It should be noted that the opening ratio of the upper primary color ink and the opening ratio of the lower black ink will be mixed and displayed in the naked eye of the user to achieve the expected required color.

[0038] Step S3, determine whether the opening rate of the lower black ink is zero. If so, apply voltage to the first primary color driving electrode normally to drive it so that the color corresponding to the upper primary color ink is expanded and the color is matched with the white of the lower white hydrophobic layer to achieve the required display color; if not, enter step S4.

[0039] It should be noted that when the aperture ratio of the lower black ink layer is zero, black is not required to display the desired color; the desired display color can be achieved by matching the primary inks with white. At this point, the black ink is collected above the first black drive electrode and is blocked by the primary inks, preventing it from occupying the white space of the lower white hydrophobic layer that participates in the display. Furthermore, because the black ink is concentrated together, the overlap area between the upper primary ink layer and the lower black ink layer is minimized, preventing the upper primary ink from significantly affecting its color rendering.

[0040] Step S4: applying a diffusion potential to the first black driving electrode and applying a gathering potential to the second black driving electrode, so that the lower layer of black ink gathers above the second black driving electrode.

[0041] The hydrophobicity of the lower black ink corresponding to the diffusion potential is smaller than that of the gathering potential.

[0042] It should be noted that when the aperture ratio of the lower black ink is not zero, it means that the required color needs to be displayed in black. Therefore, it is necessary to drive the lower black ink to the top of the second black drive electrode and expand it from above the second black drive electrode to reduce the overlap area with the upper ink.

[0043] Step S5: Apply voltages to the first primary color driving electrode and the second black driving electrode respectively according to the opening ratio of the upper primary color ink and the opening ratio of the lower black ink, so that the colors corresponding to the upper primary color ink and the lower black ink are expanded, and the color ratio is matched with the white color of the lower white hydrophobic layer to achieve the required display color.

[0044] In this specific embodiment, after step S5, the method further includes:

[0045] In response to display completion, a gathering potential is applied to the first black driving electrode, and a diffusion potential is applied to the second black driving electrode, so that the lower layer of black ink is restored to gather above the first black driving electrode.

[0046] It should be noted that this step is for resetting and preparing for the next display or the next frame.

[0047] In this specific embodiment, the hydrophobicity of the upper primary color ink is proportional to the applied voltage. When the double-layer ink pixel is not driven, a voltage greater than the first threshold is applied to the first primary color driving electrode to maximize the hydrophobicity of the upper primary color ink and gather under the first primary color driving electrode.

[0048] In another specific embodiment, the hydrophobicity of the upper primary color ink is inversely proportional to the applied voltage. When the double-layer ink pixel is not driven, zero voltage is applied to the first primary color driving electrode to make the hydrophobicity of the upper primary color ink reach the highest level and gather under the first primary color driving electrode.

[0049] In this specific embodiment, the hydrophobicity of the lower layer of black ink is proportional to the applied voltage. When the double-layer ink pixel is not driven, a voltage greater than the second threshold is applied to the first black driving electrode to maximize the hydrophobicity of the lower layer of black ink and gather above the first black driving electrode.

[0050] In another specific embodiment, the hydrophobicity of the lower black ink is inversely proportional to the applied voltage. When the double-layer ink pixel is not driven, zero voltage is applied to the first black driving electrode so that the hydrophobicity of the lower black ink reaches the highest level and accumulates above the first black driving electrode.

[0051] It's important to note that changing the hydrophobicity of a material's surface (i.e., the water contact angle) by varying voltage typically involves the principles of electrowetting or electrocapillarity. These techniques modify the wetting properties of a liquid on a solid surface by adjusting the interaction between the liquid and the solid surface under the influence of an applied electric field.

[0052] In this specific embodiment, Figure 4 A schematic top view of a double-layer oil display pixel provided by one embodiment of the present invention, Figure 4 When the upper middle primary color ink 226 and the lower black ink 222 are driven, they do not overlap, and the two are matched with the lower white hydrophobic layer 221 to achieve the required display color. Figure 3 As shown, Figure 3 When the middle and lower black ink 522 and the upper primary color ink 526 are driven, the starting position of the lower black ink 522 is directly below the upper primary color ink 526, so the two will overlap, causing the actual color displayed by the upper primary color ink 526 to deviate from the expected color.

[0053] From another angle, Figure 6 As shown, Figure 6 In the middle, 221 is the lower white hydrophobic layer, 222 is the lower black ink layer, 223 is the first black driving electrode, 224 is the second black driving electrode, 225 is the fluid common electrode, 226 is the upper primary color ink layer, 227 is the upper transparent hydrophobic layer, and 228 is the first primary color driving electrode. Figure 6 In the embodiment of the present invention, the lower black ink 222 is driven from the second black driving electrode 224. Figure 5 As shown, Figure 5 In the figure, 521 is the lower white hydrophobic layer, 522 is the lower black ink layer, 523 is the first black drive electrode, 525 is the fluid common electrode, 526 is the upper primary color ink layer, 527 is the upper transparent hydrophobic layer, and 528 is the first primary color drive electrode. In the prior art, the lower black ink layer 522 is driven starting from the first black drive electrode 523.

[0054] In this specific embodiment, the movement process of the lower black ink from the first black driving electrode to the second black driving electrode can be as follows: Figure 7 As shown, Figure 7First, a diffusion potential is applied to the first black driving electrode so that the lower black ink is driven to the maximum and spread out, and then a gathering potential is applied to the second black driving electrode and the diffusion potential applied to the first black driving electrode is canceled, so that the lower black ink is gathered above the second black driving electrode.

[0055] In one embodiment of the present invention, a first black drive electrode is disposed at a first corner below a lower white hydrophobic layer, and a second black drive electrode is disposed at a second corner below the lower white hydrophobic layer, diagonally opposite the first corner. When the aperture ratio of the lower black ink is non-zero, a diffusion potential is applied to the first black drive electrode, and a gathering potential is applied to the second black drive electrode, causing the lower black ink to gather above the second black drive electrode. Based on the aperture ratios of the upper primary color inks and the lower black ink, voltages are applied to the first and second primary color drive electrodes, respectively, to spread the corresponding colors of the upper primary color inks and the lower black ink, and to match the color with the white color of the lower white hydrophobic layer to achieve the desired display color. By adding the second black drive electrode, the embodiment of the present invention reduces the overlapping display area of ​​the upper primary color inks and the lower black ink during the driving process, thereby preventing the color development of the upper primary color inks from being interfered with by the lower black ink, thereby enhancing the display effect and improving display quality. Furthermore, the first black drive electrode in this embodiment of the present invention ensures that the aperture ratio of the lower black ink is not zero, so that the lower black ink reaches its highest hydrophobicity and gathers above the first black drive electrode. In this way, the area in the lower white hydrophobic layer that is color-matched with the upper primary color ink is not occupied, so that the lower black ink does not appear in this area and affect the display effect.

[0056] In summary, the embodiments of the present invention can effectively enhance the display effect and improve the display quality.

[0057] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0058] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A method for driving a double-layer ink electrowetting electronic paper display, characterized in that: The method comprises: Step S1: In response to a picture display signal, obtaining a required display color corresponding to the picture display signal for each double-layer ink pixel in the electronic paper display; wherein the double-layer ink pixel is a rectangular structure, including a lower white hydrophobic layer, a lower black ink layer is disposed above the lower white hydrophobic layer, a first black drive electrode is disposed at a first corner below the lower white hydrophobic layer, a second black drive electrode is disposed at a second corner below the lower white hydrophobic layer and diagonally opposite to the first corner, a fluid common electrode is disposed above the lower black ink layer, an upper primary color ink layer is disposed above the fluid common electrode, an upper transparent hydrophobic layer is disposed on the upper primary color ink layer, and a first primary color drive electrode is disposed at a third corner above the upper transparent hydrophobic layer and corresponding to the first corner; when the double-layer ink pixel is not driven, the lower black ink layer has the highest hydrophobicity and is concentrated above the first black drive electrode, and the upper primary color ink layer has the highest hydrophobicity and is concentrated below the first primary color drive electrode; Step S2: obtaining an upper primary color ink opening ratio and a lower black ink opening ratio corresponding to each of the double-layer ink pixels according to the required display color of each of the double-layer ink pixels; Step S3: Determine whether the opening ratio of the lower black ink layer is zero. If so, apply voltage to the first primary color driving electrode to drive the first primary color driving electrode normally, so that the color corresponding to the upper primary color ink is expanded and matched with the white color of the lower white hydrophobic layer to achieve the required display color; if not, proceed to step S4; Step S4: applying a diffusion potential to the first black driving electrode and a gathering potential to the second black driving electrode, so that the lower layer of black ink is gathered above the second black driving electrode; wherein the hydrophobicity of the lower layer of black ink corresponding to the diffusion potential is less than that of the gathering potential; Step S5: According to the opening ratio of the upper primary color ink and the opening ratio of the lower black ink, voltages are applied to the first primary color driving electrode and the second black driving electrode respectively, so that the colors corresponding to the upper primary color ink and the lower black ink are expanded, and the color ratio is matched with the white color of the lower white hydrophobic layer to achieve the required display color.

2. The driving method of a double-layer ink electrowetting electronic paper display according to claim 1, characterized in that: The double-layer ink pixels are divided into red double-layer ink pixels, green double-layer ink pixels and blue double-layer ink pixels according to the colors corresponding to the upper primary color inks. The double-layer ink pixels of three different colors constitute a pixel group for three-primary color combination display.

3. The driving method of a double-layer ink electrowetting electronic paper display according to claim 1, characterized in that: The hydrophobicity of the upper primary color ink is proportional to the applied voltage. When the double-layer ink pixel is not driven, a voltage greater than a first threshold is applied to the first primary color driving electrode to maximize the hydrophobicity of the upper primary color ink and gather under the first primary color driving electrode.

4. The driving method of a double-layer ink electrowetting electronic paper display according to claim 1, characterized in that: The hydrophobicity of the upper primary color ink is inversely proportional to the applied voltage. When the double-layer ink pixel is not driven, zero voltage is applied to the first primary color driving electrode so that the hydrophobicity of the upper primary color ink reaches the highest level and gathers under the first primary color driving electrode.

5. The driving method of a double-layer ink electrowetting electronic paper display according to claim 1, characterized in that: The hydrophobicity of the lower layer of black ink is proportional to the applied voltage. When the double-layer ink pixel is not driven, a voltage greater than the second threshold is applied to the first black driving electrode to maximize the hydrophobicity of the lower layer of black ink and gather above the first black driving electrode.

6. The driving method of a double-layer ink electrowetting electronic paper display according to claim 1, characterized in that: The hydrophobicity of the lower black ink is inversely proportional to the applied voltage. When the double-layer ink pixel is not driven, zero voltage is applied to the first black driving electrode to maximize the hydrophobicity of the lower black ink and gather above the first black driving electrode.

7. The driving method of a double-layer ink electrowetting electronic paper display according to claim 1, characterized in that: After step S5, the method further includes: The display completes the resetting step: applying the gathering potential to the first black driving electrode and applying the diffusion potential to the second black driving electrode, so that the lower layer of black ink is restored to gather above the first black driving electrode.

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